diff -ru4NwbB libpng-1.5.13/Makefile.am libpng-1.6.0beta32/Makefile.am --- libpng-1.5.13/Makefile.am 2012-09-27 06:21:26.708388115 -0500 +++ libpng-1.6.0beta32/Makefile.am 2012-11-25 12:40:21.637826341 -0600 @@ -3,14 +3,9 @@ # PNGLIB_BASENAME= libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@ -# libpng does not follow GNU file name conventions - -# "color-tests" requires automake 1.11.1 or later. Enable it if you like, -# to get red "FAIL" and green "PASS" notations during tests. -# AUTOMAKE_OPTIONS = foreign color-tests -AUTOMAKE_OPTIONS = foreign +ACLOCAL_AMFLAGS = -I scripts # test programs - run on make check, make distcheck TESTS_ENVIRONMENT= srcdir=$(srcdir) check_PROGRAMS= pngtest @@ -18,12 +13,19 @@ pngtest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la TESTS = test-pngtest.sh # Only do the following if the contrib directory is present. -check_PROGRAMS+= pngvalid +check_PROGRAMS+= pngvalid pngstest pngunknown pngvalid_SOURCES = contrib/libtests/pngvalid.c +pngstest_SOURCES = contrib/libtests/pngstest.c +pngunknown_SOURCES = contrib/libtests/pngunknown.c pngvalid_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la -TESTS += test-pngvalid-simple.sh test-pngvalid-full.sh +pngstest_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la +pngunknown_LDADD = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la +TESTS += contrib/libtests/test-pngunknown.sh\ + contrib/libtests/test-pngvalid-simple.sh\ + contrib/libtests/test-pngvalid-full.sh\ + contrib/libtests/test-pngstest.sh # man pages dist_man_MANS= libpng.3 libpngpf.3 png.5 @@ -45,10 +47,8 @@ endif nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h -libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS = @LIBPNG_DEFINES@ - libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS = -no-undefined -export-dynamic \ -version-number @PNGLIB_MAJOR@@PNGLIB_MINOR@:@PNGLIB_RELEASE@:0 if HAVE_LD_VERSION_SCRIPT @@ -85,16 +85,22 @@ CMakeLists.txt example.c libpng-manual.txt SCRIPT_CLEANFILES=scripts/*.out scripts/*.chk scripts/pnglibconf.dfn -CLEANFILES= dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \ +CLEANFILES= *.tf? pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@-config libpng.vers libpng.sym \ - check.new pnglibconf.* symbols.new pngtest-log.txt \ + check.new pnglibconf.* pngprefix.h symbols.new pngtest-log.txt \ $(SCRIPT_CLEANFILES) MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \ config.sub configure depcomp install-sh ltmain.sh missing +# PNG_COPTS give extra options for the C compiler to be used on all compilation +# steps (unless targe_CFLAGS is specified; that will take precedence over +# AM_CFLAGS) +PNG_COPTS = @PNG_COPTS@ +AM_CFLAGS = ${PNG_COPTS} + # DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe # other operating systems (NeXT?) the C preprocessor selected by configure # checks input tokens for validity - effectively it performs part of the ANSI-C # parsing - and therefore fails with the .df files. configure.ac has special @@ -109,19 +115,45 @@ $(PNGLIB_BASENAME)-config: libpng-config cp libpng-config $@ scripts/sym.out scripts/vers.out: png.h pngconf.h pnglibconf.h +scripts/prefix.out: png.h pngconf.h pnglibconf.out scripts/symbols.out: png.h pngconf.h $(srcdir)/scripts/pnglibconf.h.prebuilt libpng.sym: scripts/sym.out rm -f $@ cp $? $@ libpng.vers: scripts/vers.out rm -f $@ cp $? $@ + +if DO_PNG_PREFIX +# Rename functions in scripts/prefix.out with a PNG_PREFIX prefix. +# Rename macros in scripts/macro.lst from PNG_PREFIXpng_ to PNG_ (the actual +# implementation of the macro). +pnglibconf.h: pnglibconf.out scripts/prefix.out scripts/macro.lst + rm -f $@ + $(AWK) 's==0 && NR>1{print prev}\ + s==0{prev=$$0}\ + s==1{print "#define", $$1, "@PNG_PREFIX@" $$1}\ + s==2{print "#define @PNG_PREFIX@png_" $$1, "PNG_" $$1}\ + END{print prev}' s=0 pnglibconf.out s=1 scripts/prefix.out\ + s=2 ${srcdir}/scripts/macro.lst >pnglibconf.tf8 + mv pnglibconf.tf8 $@ + +pngprefix.h: scripts/intprefix.out + rm -f pngprefix.tf1 + $(AWK) '{print "#define", $$1, "@PNG_PREFIX@" $$1}' $? >pngprefix.tf1 + mv pngprefix.tf1 $@ +else pnglibconf.h: pnglibconf.out rm -f $@ cp $? $@ + +pngprefix.h: # is empty + :>$@ +endif + $(srcdir)/scripts/pnglibconf.h.prebuilt: @echo "Attempting to build $@" >&2 @echo "This is a machine generated file, but if you want to make" >&2 @echo "a new one simply make 'scripts/pnglibconf.out' and copy that" >&2 @@ -129,9 +161,10 @@ # The following is necessary to ensure that the local pnglibconf.h is used, not # an installed one (this can happen immediately after on a clean system if # 'make test' is the first thing the user does.) -contrib/libtests/pngvalid.o pngtest.o: pnglibconf.h +contrib/libtests/pngstest.o contrib/libtests/pngvalid.o pngtest.o: pnglibconf.h +contrib/libtests/pngunknown.o: pnglibconf.h # We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually # be built with PNG_USE_READ_MACROS; this prevents the read macros from # interfering with the symbol file format. @@ -139,53 +172,59 @@ -DPNGLIB_VERSION='@PNGLIB_VERSION@'\ -DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\ -DPNG_NO_USE_READ_MACROS -DPNG_BUILDING_SYMBOL_TABLE +if DO_PNG_PREFIX +SYMBOL_CFLAGS += -DPNG_PREFIX='@PNG_PREFIX@' +endif + .dfn.out: - rm -f $@ dfn.c dfn?.out + rm -f $@ $*.c $*.tf[123] test -d scripts || mkdir scripts - echo '#include "$<"' >dfn.c - $(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\ - $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out + echo '#include "$<"' >$*.c + $(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES)\ + $(CPPFLAGS) $(SYMBOL_CFLAGS) $*.c > $*.tf1 $(SED) -n -e 's|^.*PNG_DEFN_MAGIC *-\(.*\)- *PNG_DEFN_END.*$$|\1|p'\ - dfn1.out >dfn2.out - $(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' dfn2.out >dfn3.out - rm -f dfn.c dfn[12].out - mv dfn3.out $@ + $*.tf1 >$*.tf2 + $(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' $*.tf2 >$*.tf3 + rm -f $*.c $*.tf[12] + mv $*.tf3 $@ # The .dfn file for pnglibconf.h is machine generated pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h pngusr.dfa $(DFA_XTRA) - rm -f $@ dfn?.out - $(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out version=search\ + rm -f $@ $*.tf[45] + $(AWK) -f ${srcdir}/scripts/options.awk out=$*.tf4 version=search\ ${srcdir}/pngconf.h ${srcdir}/scripts/pnglibconf.dfa\ ${srcdir}/pngusr.dfa $(DFA_XTRA) 1>&2 - $(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2 - rm dfn1.out - mv dfn2.out $@ + $(AWK) -f ${srcdir}/scripts/options.awk out=$*.tf5 $*.tf4 1>&2 + rm $*.tf4 + mv $*.tf5 $@ # Symbol checks (.def and .out files should match) scripts/symbols.chk: scripts/checksym.awk scripts/symbols.def scripts/symbols.out + .out.chk: - rm -f $@ symbols.new + rm -f $@ $*.new $(AWK) -f ${srcdir}/scripts/checksym.awk ${srcdir}/scripts/${*F}.def\ - $< >&2 - mv symbols.new $@ + of="$*.new" $< >&2 + mv $*.new $@ # used on demand to regenerate the standard header, CPPFLAGS should # be empty - no non-standard defines scripts/pnglibconf.dfn: scripts/pnglibconf.dfa scripts/options.awk pngconf.h - rm -f $@ dfn?.out + rm -f $@ pnglibconf.tf[67] test -z "$(CPPFLAGS)" echo "com @PNGLIB_VERSION@ STANDARD API DEFINITION" |\ - $(AWK) -f ${srcdir}/scripts/options.awk out=dfn1.out logunsupported=1 - version=search ${srcdir}/pngconf.h -\ + $(AWK) -f ${srcdir}/scripts/options.awk out=pnglibconf.tf6\ + logunsupported=1 version=search ${srcdir}/pngconf.h -\ ${srcdir}/scripts/pnglibconf.dfa 1>&2 - $(AWK) -f ${srcdir}/scripts/options.awk out=dfn2.out dfn1.out 1>&2 - rm dfn1.out - mv dfn2.out $@ + $(AWK) -f ${srcdir}/scripts/options.awk out=pnglibconf.tf7\ + pnglibconf.tf6 1>&2 + rm pnglibconf.tf6 + mv pnglibconf.tf7 $@ $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS): png.h pngconf.h \ - pnglibconf.h pngpriv.h pngdebug.h pnginfo.h pngstruct.h + pnglibconf.h pngpriv.h pngdebug.h pnginfo.h pngstruct.h pngprefix.h test: check-am # Extra checks diff -ru4NwbB libpng-1.5.13/autogen.sh libpng-1.6.0beta32/autogen.sh --- libpng-1.5.13/autogen.sh 2012-09-27 06:21:26.720653897 -0500 +++ libpng-1.6.0beta32/autogen.sh 2012-11-25 12:40:21.650380646 -0600 @@ -1,34 +1,219 @@ #! /bin/sh -# a quick hack script to generate necessary files from -# auto* tools. # -# WARNING: if you run this you will change the versions -# of the tools which are used and, maybe, required! +# Run 'autoreconf' to build 'configure', 'Makefile.in' and other configure +# control files. +# +# The first time this is run on a GIT checkout the only files that exist are +# configure.ac and Makefile.am; all of the autotools support scripts are +# missing. They are instantiated with autoreconf --force --install. +# +# For regular ("tarball") distributions all the files should exist. We do not +# want them to be updated *under any circumstances*. It should never be +# necessary to rune autogen.sh because ./configure --enable-maintainer-mode says +# what to do if Makeile.am or configure.ac are changed. +# +# It is *probably* OK to update the files on a GIT checkout, because they have +# come from the local tools, but leave that to the user who is assumed to know +# whether it is ok or required. +# +# This script is intended to work without arguments, there are, however, hidden +# arguments for (a) use while testing the script and (b) to fix up systems that +# have been broken. If (b) is required the script prompts for the correct +# options. For this reason the options are *NOT* documented in the help; this +# is deliberate; UTSL. +# +clean= +maintainer= +while test $# -gt 0 +do + case "$1" in + --maintainer) + maintainer=1;; + + --clean) + clean=1;; + + *) + exec >&2 + echo "$0: usage: ./autogen.sh" + if test -d .git + then + echo " ./autogen.sh generates the configure script and" + echo " Makefile.in, or refreshes them after changes to Makefile.am" + echo " or configure.ac. You may prefer to just run autoreconf." + elif test -z "$maintainer" + then + echo " DO NOT RUN THIS SCRIPT." + echo " If you need to change Makefile.am or configure.ac then you" + echo " also need to run ./configure --enable-maintainer-mode and" + echo " use the appropriate autotools, *NOT* this script, to update" + echo " everything, please check the documentation of autoreconf." + echo " WARNING: libpng is intentionally generated with a known," + echo " fixed, set of autotools. It is known *NOT* to work with" + echo " the collection of autotools distributed on highly reputable" + echo " operating systems." + echo " Remember: autotools is GNU software, you are expected to" + echo " pay for support." + else + echo " You have run autogen.sh with --maintainer enabled and you" + echo " are not using a GIT distribution, then you have given an" + echo " unrecognized argument. This is not good. --maintainer" + echo " switches off any assumptions that you might not know what" + echo " you are doing." + fi + exit 1;; + esac + + shift +done +# +# First check for a set of the autotools files; if absent then this is assumed +# to be a GIT version and the local autotools must be used. If present this +# is a tarball distribution and the script should not be used. If partially +# present bad things are happening. +# +# The autotools generated files: +libpng_autotools_files="Makefile.in aclocal.m4 config.guess config.h.in\ + config.sub configure depcomp install-sh ltmain.sh missing" +# +# These are separate because 'maintainer-clean' does not remove them. +libpng_libtool_files="scripts/libtool.m4 scripts/ltoptions.m4\ + scripts/ltsugar.m4 scripts/ltversion.m4 scripts/lt~obsolete.m4" + +libpng_autotools_dirs="autom4te.cache" # not required +# +# The configure generated files: +libpng_configure_files="Makefile config.h config.log config.status\ + libpng-config libpng.pc libtool stamp-h1" + +libpng_configure_dirs=".deps" +# +# We must remove the configure generated files as well as the autotools +# generated files if autotools are regenerated because otherwise if configure +# has been run without "--enable-maintainer-mode" make can do a partial update +# of Makefile. These functions do the two bits of cleaning. +clean_autotools(){ + rm -rf $libpng_autotools_files $libpng_libtool_files $libpng_autotools_dirs +} + +clean_configure(){ + rm -rf $libpng_configure_files $libpng_configure_dirs +} +# +# Clean: remove everything (this is to help with testing) +if test -n "$clean" +then + clean_configure + if test -n "$maintainer" + then + clean_autotools + fi + + exit 0 +fi +# +# Validate the distribution. +libpng_autotools_file_found= +libpng_autotools_file_missing= +for file in $libpng_autotools_files +do + if test -f "$file" + then + libpng_autotools_file_found=1 + else + libpng_autotools_file_missing=1 + fi +done +# +# Presence of one of these does not *invalidate* missing, but absence +# invalidates found. +for file in $libpng_libtool_files +do + if test ! -f "$file" + then + libpng_autotools_file_missing=1 + fi +done +# +# The cache directory doesn't matter - it will be regenerated and does not exist +# anyway in a tarball. +# +# Either everything is missing or everything is there, the --maintainer option +# just changes this so that the mode is set to generate all the files. +mode= +if test -z "$libpng_autotools_file_found" -o -n "$maintainer" +then + mode="autoreconf" +else + if test -n "$libpng_autotools_file_missing" + then + mode="broken" + else + mode="configure" + fi +fi +# +# So: +case "$mode" in + autoreconf) + # Clean in case configure files exist + clean_configure + clean_autotools + # Everything must be initialized, so use --force + if autoreconf --warnings=all --force --install + then + missing= + for file in $libpng_autotools_files + do + test -f "$file" || missing=1 + done + # ignore the cache directory + test -z "$missing" || { + exec >&2 + echo "autoreconf was run, but did not produce all the expected" + echo "files. It is likely that your autotools installation is" + echo "not compatible with that expected by libpng." + exit 1 + } + else + exec >&2 + echo "autoreconf failed: your version of autotools is incompatible" + echo "with this libpng version. Please use a distributed archive" + echo "(which includes the autotools generated files) and run configure" + echo "instead." + exit 1 + fi;; -# You can define your own replacements in your environment. -# $AUTOCONF, $AUTOMAKE, $AUTOHEADER, $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE + configure) + if test -d .git + then + exec >&2 + echo "ERROR: running autoreconf on an initialized sytem" + echo " This is not necessary; it is only necessary to remake the" + echo " autotools generated files if Makefile.am or configure.ac" + echo " change and make does the right thing with:" + echo + echo " ./configure --enable-maintainer-mode." + echo + echo " You can run autoreconf yourself if you don't like maintainer" + echo " mode and you can also just run autoreconf -f -i to initialize" + echo " everything in the first place; this script is only for" + echo " compatiblity with prior releases." + exit 1 + else + exec >&2 + echo "autogen.sh is intended only to generate 'configure' on systems" + echo "that do not have it. You have a complete 'configure', if you" + echo "need to change Makefile.am or configure.ac you also need to" + echo "run configure with the --enable-maintainer-mode option." + exit 1 + fi;; -touch Makefile.am configure.ac -{ - LT=${LIBTOOLIZE-libtoolize} - echo "running $LT" >&2 - $LT --force --copy --automake -} && { - AL=${ACLOCAL-aclocal} - echo "running $AL" >&2 - $AL -} && { - AH=${AUTOHEADER-autoheader} - echo "running $AH [ignore the warnings]" >&2 - $AH -} && { - AM=${AUTOMAKE-automake} - echo "running $AM" >&2 - $AM --force-missing --foreign -a -c -} && { - AC=${AUTOCONF-autoconf} - echo "running $AC" >&2 - $AC -} && - echo "autogen complete" >&2 || - echo "ERROR: autogen.sh failed, autogen is incomplete" >&2 + broken) + exec >&2 + echo "Your system has a partial set of autotools generated files." + echo "autogen.sh is unable to proceed. The full set of files is" + echo "contained in the libpng 'tar' distribution archive and you do" + echo "not need to run autogen.sh if you use it." + exit 1;; +esac diff -ru4NwbB libpng-1.5.13/configure.ac libpng-1.6.0beta32/configure.ac --- libpng-1.5.13/configure.ac 2012-09-27 06:21:26.715073985 -0500 +++ libpng-1.6.0beta32/configure.ac 2012-11-25 12:40:21.644253880 -0600 @@ -13,62 +13,107 @@ dnl This is here to prevent earlier autoconf from being used, it dnl should not be necessary to regenerate configure if the time dnl stamps are correct -AC_PREREQ(2.59) +AC_PREREQ([2.68]) dnl Version number stuff here: AC_INIT([libpng], [1.6.0beta32], [png-mng-implement@lists.sourceforge.net]) -AM_INIT_AUTOMAKE -dnl stop configure from automagically running automake +AC_CONFIG_MACRO_DIR([scripts]) + +# libpng does not follow GNU file name conventions (hence 'foreign') +# color-tests requires automake 1.11 or later +# silent-rules requires automake 1.11 or later +# dist-xz requires automake 1.11 or later +# 1.12.2 fixes a security issue in 1.11.2 and 1.12.1 +AM_INIT_AUTOMAKE([1.12.2 foreign dist-xz dist-bzip2 color-tests silent-rules]) +# was: +# AM_INIT_AUTOMAKE AM_MAINTAINER_MODE +dnl configure.ac and Makefile.am expect automake 1.11.2 or a compatible later +dnl version; aclocal.m4 will generate a failure if you use a prior version of +dnl automake, so the following is not necessary (and is not defined anyway): +dnl AM_PREREQ([1.11.2]) +dnl stop configure from automagically running automake + PNGLIB_VERSION=1.6.0beta32 PNGLIB_MAJOR=1 -PNGLIB_MINOR=5 +PNGLIB_MINOR=6 PNGLIB_RELEASE=%RELEASE% dnl End of version number stuff AC_CONFIG_SRCDIR([pngget.c]) -AM_CONFIG_HEADER(config.h) +AC_CONFIG_HEADERS([config.h]) # Checks for programs. AC_LANG([C]) AC_PROG_CC AM_PROG_AS -AC_PROG_LD +LT_PATH_LD AC_PROG_CPP AC_CHECK_TOOL(SED, sed, :) AC_CHECK_TOOL(AWK, awk, :) AC_PROG_INSTALL AC_PROG_LN_S AC_PROG_MAKE_SET + +dnl libtool/libtoolize; version 2.4.2 is the tested version, this or any +dnl compatible later version may be used LT_INIT([win32-dll]) +LT_PREREQ([2.4.2]) # On Solaris 10 and 12 CPP gets set to cc -E, however this still # does some input parsing. We need strict ANSI-C style tokenization, # check this: AC_REQUIRE_CPP AC_MSG_CHECKING([for a C preprocessor that does not parse its input]) -AC_TRY_CPP([1.5.0 16BIT], +AC_PREPROC_IFELSE([AC_LANG_SOURCE([[1.1.1 16BIT]])], [DFNCPP="$CPP"], [DFNCPP="" sav_CPP="$CPP" - for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"; do - AC_TRY_CPP([1.5.0 16BIT], + for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp" + do + AC_PREPROC_IFELSE([AC_LANG_SOURCE([[1.1.1 16BIT]])], [DFNCPP="$CPP"] [break],,) done - CPP="$sav_CPP"]) + CPP="$sav_CPP" + ]) if test -n "$DFNCPP"; then AC_MSG_RESULT([$DFNCPP]) AC_SUBST(DFNCPP) else AC_MSG_FAILURE([not found], 1) fi +# -Werror cannot be passed to GCC in CFLAGS because configure will fail (it +# checks the compiler with a program that generates a warning), add the +# following option to deal with this +AC_ARG_VAR(PNG_COPTS, + [additional flags for the C compiler, use this for options that would] + [cause configure itself to fail]) +AC_ARG_ENABLE(werror, + AS_HELP_STRING([[[--enable-werror[=OPT]]]], + [Pass -Werror or the given argument to the compiler if it is supported]), + [test "$enable_werror" = "yes" && enable_werror="-Werror" + if test "$enable_werror" != "no"; then + sav_CFLAGS="$CFLAGS" + CFLAGS="$enable_werror $CFLAGS" + AC_MSG_CHECKING([if the compiler allows $enable_werror]) + AC_COMPILE_IFELSE( + [AC_LANG_SOURCE([ + [int main(int argc, char **argv){] + [return argv[argc-1][0];] + [}]])], + AC_MSG_RESULT(yes) + PNG_COPTS="$PNG_COPTS $enable_werror", + AC_MSG_RESULT(no)) + CFLAGS="$sav_CFLAGS" + fi],) + # Checks for header files. AC_HEADER_STDC AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h]) @@ -79,29 +124,24 @@ AC_C_RESTRICT # Checks for library functions. AC_FUNC_STRTOD -AC_CHECK_FUNCS([memset], , AC_ERROR([memset not found in libc])) -AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_ERROR([cannot find pow])) ) +AC_CHECK_FUNCS([memset], , AC_MSG_ERROR(memset not found in libc)) +AC_CHECK_FUNCS([pow], , AC_CHECK_LIB(m, pow, , AC_MSG_ERROR(cannot find pow)) ) AC_ARG_WITH(zlib-prefix, - AC_HELP_STRING([--with-zlib-prefix], + AS_HELP_STRING([[[--with-zlib-prefix]]], [prefix that may have been used in installed zlib]), [ZPREFIX=${withval}], [ZPREFIX='z_']) AC_CHECK_LIB(z, zlibVersion, , - AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , - AC_ERROR([zlib not installed]))) + AC_CHECK_LIB(z, ${ZPREFIX}zlibVersion, , AC_MSG_ERROR(zlib not installed))) # The following is for pngvalid, to ensure it catches FP errors even on # platforms that don't enable FP exceptions, the function appears in the math # library (typically), it's not an error if it is not found. AC_CHECK_LIB([m], [feenableexcept]) AC_CHECK_FUNCS([feenableexcept]) -LIBPNG_DEFINES=-DPNG_CONFIGURE_LIBPNG -LIBPNG_DEFINES=$LIBPNG_DEFINES -AC_SUBST(LIBPNG_DEFINES) - AC_MSG_CHECKING([if using Solaris linker]) SLD=`$LD --version 2>&1 | grep Solaris` if test "$SLD"; then have_solaris_ld=yes @@ -160,43 +200,55 @@ # Additional arguments (and substitutions) # Allow the pkg-config directory to be set AC_ARG_WITH(pkgconfigdir, - AC_HELP_STRING([--with-pkgconfigdir], + AS_HELP_STRING([[[--with-pkgconfigdir]]], [Use the specified pkgconfig dir (default is libdir/pkgconfig)]), [pkgconfigdir=${withval}], [pkgconfigdir='${libdir}/pkgconfig']) AC_SUBST([pkgconfigdir]) -AC_MSG_NOTICE([pkgconfig directory is ${pkgconfigdir}]) +AC_MSG_NOTICE([[pkgconfig directory is ${pkgconfigdir}]]) # Make the *-config binary config scripts optional AC_ARG_WITH(binconfigs, - AC_HELP_STRING([--with-binconfigs], + AS_HELP_STRING([[[--with-binconfigs]]], [Generate shell libpng-config scripts as well as pkg-config data] [@<:@default=yes@:>@]), [if test "${withval}" = no; then binconfigs= - AC_MSG_NOTICE([libpng-config scripts will not be built]) + AC_MSG_NOTICE([[libpng-config scripts will not be built]]) else binconfigs='${binconfigs}' fi], [binconfigs='${binconfigs}']) AC_SUBST([binconfigs]) +# Support for prefixes to the API function names; this will generate defines +# at the start of the build to rename exported library functions +AC_ARG_WITH(libpng-prefix, + AS_HELP_STRING([[[--with-libpng-prefix]]], + [prefix libpng exported function (API) names with the given value]), + [if test "${withval:-no}" != "no"; then + AC_SUBST([PNG_PREFIX], [${withval}]) + fi]) +AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"]) + # Because GCC by default assembles code with an executable stack, even though it # compiles C code with a non-executable stack, it is necessary to do a fixup # here (this may by GCC specific) AC_SUBST([AM_CCASFLAGS], [-Wa,--noexecstack]) AC_ARG_ENABLE([arm-neon], - AC_HELP_STRING([--enable-arm-neon], [Enable ARM NEON optimizations]), - [if test "${enableval}" = yes; then + AS_HELP_STRING([[[--enable-arm-neon]]], [Enable ARM NEON optimizations]), + [if test "${enableval}" = "yes"; then AC_DEFINE([PNG_ARM_NEON], [1], [Enable ARM NEON optimizations]) AC_DEFINE([PNG_ALIGNED_MEMORY_SUPPORTED], [1], [Align row buffers]) fi]) AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" = yes]) +AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]]) + # Config files, substituting as above AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in]) AC_CONFIG_FILES([libpng-config:libpng-config.in], [chmod +x libpng-config]) diff -ru4NwbB libpng-1.5.13/contrib/examples/README.txt libpng-1.6.0beta32/contrib/examples/README.txt --- libpng-1.5.13/contrib/examples/README.txt 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/examples/README.txt 2011-11-25 06:25:01.000000000 -0600 @@ -0,0 +1,24 @@ + +This directory (contrib/examples) contains examples of libpng usage. + +NO COPYRIGHT RIGHTS ARE CLAIMED TO ANY OF THE FILES IN THIS DIRECTORY. + +To the extent possible under law, the authors have waived all copyright and +related or neighboring rights to this work. This work is published from: +United States. + +The files may be used freely in any way. The intention is that appropriate +parts of the files be used in other libpng-using programs without any need for +the authors of the using code to seek copyright or license from the original +authors. + +The source code and comments in this directory are the original work of the +people named below. No other person or organization has made contributions to +the work in this directory. + +ORIGINAL AUTHORS + The following people have contributed to the code in this directory. None + of the people below claim any rights with regard to the contents of this + directory. + + John Bowler diff -ru4NwbB libpng-1.5.13/contrib/examples/iccfrompng.c libpng-1.6.0beta32/contrib/examples/iccfrompng.c --- libpng-1.5.13/contrib/examples/iccfrompng.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/examples/iccfrompng.c 2011-11-25 06:25:09.000000000 -0600 @@ -0,0 +1,180 @@ +/*- iccfrompng + * + * COPYRIGHT: Written by John Cunningham Bowler, 2011. + * To the extent possible under law, the author has waived all copyright and + * related or neighboring rights to this work. This work is published from: + * United States. + * + * Extract any icc profiles found in the given PNG files. This is a simple + * example of a program which extracts information from the header of a PNG file + * without processing the image. Notice that some header information may occur + * after the image data, textual data and comments are an example; the approach + * in this file won't work reliably for such data because it only looks for the + * information in the section of the file that preceeds the image data. + * + * Compile and link against libpng and zlib, plus anything else required on the + * system you use. + * + * To use supply a list of PNG files containing iCCP chunks, the chunks will be + * extracted to a similarly named file with the extension replaced by 'icc', + * which will be overwritten without warning. + */ +#include +#include +#include +#include + +#include + +static int verbose = 1; +static png_byte no_profile[] = "no profile"; + +static png_bytep +extract(FILE *fp, png_uint_32 *proflen) +{ + png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0); + png_infop info_ptr = NULL; + png_bytep result = NULL; + + /* Initialize for error or no profile: */ + *proflen = 0; + + if (png_ptr == NULL) + { + fprintf(stderr, "iccfrompng: version library mismatch?\n"); + return 0; + } + + if (setjmp(png_jmpbuf(png_ptr))) + { + png_destroy_read_struct(&png_ptr, &info_ptr, NULL); + return 0; + } + + png_init_io(png_ptr, fp); + + info_ptr = png_create_info_struct(png_ptr); + if (info_ptr == NULL) + png_error(png_ptr, "OOM allocating info structure"); + + png_read_info(png_ptr, info_ptr); + + { + png_charp name; + int compression_type; + png_bytep profile; + + if (png_get_iCCP(png_ptr, info_ptr, &name, &compression_type, &profile, + proflen) & PNG_INFO_iCCP) + { + result = malloc(*proflen); + if (result != NULL) + memcpy(result, profile, *proflen); + + else + png_error(png_ptr, "OOM allocating profile buffer"); + } + + else + result = no_profile; + } + + png_destroy_read_struct(&png_ptr, &info_ptr, NULL); + return result; +} + +static int +extract_one_file(const char *filename) +{ + int result = 0; + FILE *fp = fopen(filename, "rb"); + + if (fp != NULL) + { + png_uint_32 proflen = 0; + png_bytep profile = extract(fp, &proflen); + + if (profile != NULL && profile != no_profile) + { + size_t len; + char *output; + + { + const char *ep = strrchr(filename, '.'); + + if (ep != NULL) + len = ep-filename; + + else + len = strlen(filename); + } + + output = malloc(len + 5); + if (output != NULL) + { + FILE *of; + + memcpy(output, filename, len); + strcpy(output+len, ".icc"); + + of = fopen(output, "wb"); + if (of != NULL) + { + if (fwrite(profile, proflen, 1, of) == 1 && + fflush(of) == 0 && + fclose(of) == 0) + { + if (verbose) + printf("%s -> %s\n", filename, output); + /* Success return */ + result = 1; + } + + else + { + fprintf(stderr, "%s: error writing profile\n", output); + if (remove(output)) + fprintf(stderr, "%s: could not remove file\n", output); + } + } + + else + fprintf(stderr, "%s: failed to open output file\n", output); + + free(output); + } + + else + fprintf(stderr, "%s: OOM allocating string!\n", filename); + + free(profile); + } + + else if (verbose && profile == no_profile) + printf("%s has no profile\n", filename); + } + + else + fprintf(stderr, "%s: could not open file\n", filename); + + return result; +} + +int +main(int argc, char **argv) +{ + int i; + int extracted = 0; + + for (i=1; i +#include +#include /* required for error handling */ + +/* Normally use here to get the installed libpng, but this is done to + * ensure the code picks up the local libpng implementation: + */ +#include "../../png.h" + +/* Return component 'c' of pixel 'x' from the given row. */ +static unsigned int +component(png_const_bytep row, png_uint_32 x, unsigned int c, + unsigned int bit_depth, unsigned int channels) +{ + /* PNG images can be up to 2^31 pixels wide, but this means they can be up to + * 2^37 bits wide (for a 64-bit pixel - the largest possible) and hence 2^34 + * bytes wide. Since the row fitted into memory, however, the following must + * work: + */ + png_uint_32 bit_offset_hi = bit_depth * ((x >> 6) * channels + c); + png_uint_32 bit_offset_lo = bit_depth * ((x & 0x3f) * channels + c); + + row = (png_const_bytep)(((PNG_CONST png_byte (*)[8])row) + bit_offset_hi); + row += bit_offset_lo >> 3; + bit_offset_lo &= 0x07; + + /* PNG pixels are packed into bytes to put the first pixel in the highest + * bits of the byte and into two bytes for 16-bit values with the high 8 bits + * first, so: + */ + switch (bit_depth) + { + case 1: return (row[0] >> (7-bit_offset_lo)) & 0x01; + case 2: return (row[0] >> (6-bit_offset_lo)) & 0x03; + case 4: return (row[0] >> (4-bit_offset_lo)) & 0x0f; + case 8: return row[0]; + case 16: return (row[0] << 8) + row[1]; + default: + /* This should never happen, it indicates a bug in this program or in + * libpng itself: + */ + fprintf(stderr, "pngpixel: invalid bit depth %u\n", bit_depth); + exit(1); + } +} + +/* Print a pixel from a row returned by libpng; determine the row format, find + * the pixel, and print the relevant information to stdout. + */ +static void +print_pixel(png_structp png_ptr, png_infop info_ptr, png_const_bytep row, + png_uint_32 x) +{ + PNG_CONST unsigned int bit_depth = png_get_bit_depth(png_ptr, info_ptr); + + switch (png_get_color_type(png_ptr, info_ptr)) + { + case PNG_COLOR_TYPE_GRAY: + printf("GRAY %u\n", component(row, x, 0, bit_depth, 1)); + return; + + /* The palette case is slightly more difficult - the palette and, if + * present, the tRNS ('transparency', though the values are really + * opacity) data must be read to give the full picture: + */ + case PNG_COLOR_TYPE_PALETTE: + { + PNG_CONST unsigned int index = component(row, x, 0, bit_depth, 1); + png_colorp palette = NULL; + int num_palette = 0; + + if ((png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette) & + PNG_INFO_PLTE) && num_palette > 0 && palette != NULL) + { + png_bytep trans_alpha = NULL; + int num_trans = 0; + if ((png_get_tRNS(png_ptr, info_ptr, &trans_alpha, &num_trans, + NULL) & PNG_INFO_tRNS) && num_trans > 0 && + trans_alpha != NULL) + printf("INDEXED %u = %d %d %d %d\n", index, + palette[index].red, palette[index].green, + palette[index].blue, + index < num_trans ? trans_alpha[index] : 255); + + else /* no transparency */ + printf("INDEXED %u = %d %d %d\n", index, + palette[index].red, palette[index].green, + palette[index].blue); + } + + else + printf("INDEXED %u = invalid index\n", index); + } + return; + + case PNG_COLOR_TYPE_RGB: + printf("RGB %u %u %u\n", component(row, x, 0, bit_depth, 3), + component(row, x, 1, bit_depth, 3), + component(row, x, 2, bit_depth, 3)); + return; + + case PNG_COLOR_TYPE_GRAY_ALPHA: + printf("GRAY+ALPHA %u %u\n", component(row, x, 0, bit_depth, 2), + component(row, x, 1, bit_depth, 2)); + return; + + case PNG_COLOR_TYPE_RGB_ALPHA: + printf("RGBA %u %u %u %u\n", component(row, x, 0, bit_depth, 4), + component(row, x, 1, bit_depth, 4), + component(row, x, 2, bit_depth, 4), + component(row, x, 3, bit_depth, 4)); + return; + + default: + png_error(png_ptr, "invalid color type"); + } +} + +int main(int argc, const char **argv) +{ + /* This program uses the default, based, libpng error handling + * mechanism, therefore any local variable that exists before the call to + * setjmp and is changed after the call to setjmp returns successfully must + * be declared with 'volatile' to ensure that their values don't get + * destroyed by longjmp: + */ + volatile int result = 1/*fail*/; + + if (argc == 4) + { + long x = atol(argv[1]); + long y = atol(argv[2]); + FILE *f = fopen(argv[3], "rb"); + volatile png_bytep row = NULL; + + if (f != NULL) + { + /* libpng requires a callback function for handling errors; this + * callback must not return. The default callback function uses a + * stored style jmp_buf which is held in a png_struct and + * writes error messages to stderr. Creating the png_struct is a + * little tricky; just copy the following code. + */ + png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, + NULL, NULL, NULL); + + if (png_ptr != NULL) + { + png_infop info_ptr = png_create_info_struct(png_ptr); + + if (info_ptr != NULL) + { + /* Declare stack variables to hold pointers to locally allocated + * data. + */ + + /* Initialize the error control buffer: */ + if (setjmp(png_jmpbuf(png_ptr)) == 0) + { + png_uint_32 width, height; + int bit_depth, color_type, interlace_method, + compression_method, filter_method; + png_bytep row_tmp; + + /* Now associate the recently opened (FILE*) with the default + * libpng initialization functions. Sometimes libpng is + * compiled without stdio support (it can be difficult to do + * in some environments); in that case you will have to write + * your own read callback to read data from the (FILE*). + */ + png_init_io(png_ptr, f); + + /* And read the first part of the PNG file - the header and + * all the information up to the first pixel. + */ + png_read_info(png_ptr, info_ptr); + + /* This fills in enough information to tell us the width of + * each row in bytes, allocate the appropriate amount of + * space. In this case png_malloc is used - it will not + * return if memory isn't available. + */ + row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, + info_ptr)); + + /* To avoid the overhead of using a volatile auto copy row_tmp + * to a local here - just use row for the png_free below. + */ + row_tmp = row; + + /* All the information we need is in the header is returned by + * png_get_IHDR, if this fails we can now use 'png_error' to + * signal the error and return control to the setjmp above. + */ + if (png_get_IHDR(png_ptr, info_ptr, &width, &height, + &bit_depth, &color_type, &interlace_method, + &compression_method, &filter_method)) + { + int passes, pass; + + /* png_set_interlace_handling returns the number of + * passes required as well as turning on libpng's + * handling, but since we do it ourselves this is + * necessary: + */ + switch (interlace_method) + { + case PNG_INTERLACE_NONE: + passes = 1; + break; + + case PNG_INTERLACE_ADAM7: + passes = PNG_INTERLACE_ADAM7_PASSES; + break; + + default: + png_error(png_ptr, "pngpixel: unknown interlace"); + } + + /* Now read the pixels, pass-by-pass, row-by-row: */ + png_start_read_image(png_ptr); + + for (pass=0; pass +#include +#include +#include + +/* Normally use here to get the installed libpng, but this is done to + * ensure the code picks up the local libpng implementation: + */ +#include "../../png.h" + +int main(int argc, const char **argv) +{ + int result = 1; + + if (argc == 3) + { + png_image image; + + /* Only the image structure version number needs to be set. */ + memset(&image, 0, sizeof image); + image.version = PNG_IMAGE_VERSION; + + if (png_image_begin_read_from_file(&image, argv[1])) + { + png_bytep buffer; + + /* Change this to try different formats! If you set a colormap format + * then you must also supply a colormap below. + */ + image.format = PNG_FORMAT_RGBA; + + buffer = malloc(PNG_IMAGE_SIZE(image)); + + if (buffer != NULL) + { + if (png_image_finish_read(&image, NULL/*background*/, buffer, + 0/*row_stride*/, NULL/*colormap for PNG_FORMAT_FLAG_COLORMAP */)) + { + if (png_image_write_to_file(&image, argv[2], + 0/*convert_to_8bit*/, buffer, 0/*row_stride*/, + NULL/*colormap*/)) + result = 0; + + else + fprintf(stderr, "pngtopng: write %s: %s\n", argv[2], + image.message); + + free(buffer); + } + + else + { + fprintf(stderr, "pngtopng: read %s: %s\n", argv[1], + image.message); + + /* This is the only place where a 'free' is required; libpng does + * the cleanup on error and success, but in this case we couldn't + * complete the read because of running out of memory. + */ + png_image_free(&image); + } + } + + else + fprintf(stderr, "pngtopng: out of memory: %lu bytes\n", + (unsigned long)PNG_IMAGE_SIZE(image)); + } + + else + /* Failed to read the first argument: */ + fprintf(stderr, "pngtopng: %s: %s\n", argv[1], image.message); + } + + else + /* Wrong number of arguments */ + fprintf(stderr, "pngtopng: usage: pngtopng input-file output-file\n"); + + return result; +} diff -ru4NwbB libpng-1.5.13/contrib/gregbook/Makefile.sgi libpng-1.6.0beta32/contrib/gregbook/Makefile.sgi --- libpng-1.5.13/contrib/gregbook/Makefile.sgi 2012-09-27 06:21:19.893052321 -0500 +++ libpng-1.6.0beta32/contrib/gregbook/Makefile.sgi 2012-11-25 12:40:10.312019574 -0600 @@ -22,11 +22,11 @@ # macros -------------------------------------------------------------------- -PNGINC = -I/usr/local/include/libpng15 -PNGLIB = -L/usr/local/lib -lpng15 # dynamically linked against libpng -#PNGLIB = /usr/local/lib/libpng15.a # statically linked against libpng +PNGINC = -I/usr/local/include/libpng16 +PNGLIB = -L/usr/local/lib -lpng16 # dynamically linked against libpng +#PNGLIB = /usr/local/lib/libpng16.a # statically linked against libpng # or: #PNGINC = -I../.. #PNGLIB = -L../.. -lpng #PNGLIB = ../../libpng.a diff -ru4NwbB libpng-1.5.13/contrib/gregbook/Makefile.unx libpng-1.6.0beta32/contrib/gregbook/Makefile.unx --- libpng-1.5.13/contrib/gregbook/Makefile.unx 2012-09-27 06:21:19.903989604 -0500 +++ libpng-1.6.0beta32/contrib/gregbook/Makefile.unx 2012-11-25 12:40:10.321673303 -0600 @@ -25,16 +25,16 @@ # macros -------------------------------------------------------------------- #PNGDIR = /usr/local/lib -#PNGINC = -I/usr/local/include/libpng15 -#PNGLIBd = -L$(PNGDIR) -lpng15 # dynamically linked, installed libpng -#PNGLIBs = $(PNGDIR)/libpng15.a # statically linked, installed libpng +#PNGINC = -I/usr/local/include/libpng16 +#PNGLIBd = -L$(PNGDIR) -lpng16 # dynamically linked, installed libpng +#PNGLIBs = $(PNGDIR)/libpng16.a # statically linked, installed libpng # or: PNGDIR = ../..# this one is for libpng-x.y.z/contrib/gregbook builds #PNGDIR = ../libpng PNGINC = -I$(PNGDIR) -PNGLIBd = -Wl,-rpath,$(PNGDIR) -L$(PNGDIR) -lpng15 # dynamically linked +PNGLIBd = -Wl,-rpath,$(PNGDIR) -L$(PNGDIR) -lpng16 # dynamically linked PNGLIBs = $(PNGDIR)/libpng.a # statically linked, local libpng ZDIR = /usr/local/lib #ZDIR = /usr/lib64 diff -ru4NwbB libpng-1.5.13/contrib/gregbook/readpng2.c libpng-1.6.0beta32/contrib/gregbook/readpng2.c --- libpng-1.5.13/contrib/gregbook/readpng2.c 2012-09-27 06:21:19.967305232 -0500 +++ libpng-1.6.0beta32/contrib/gregbook/readpng2.c 2012-11-25 12:40:10.381898047 -0600 @@ -135,31 +135,25 @@ /* prepare the reader to ignore all recognized chunks whose data won't be * used, i.e., all chunks recognized by libpng except for IHDR, PLTE, IDAT, * IEND, tRNS, bKGD, gAMA, and sRGB (small performance improvement) */ { - /* These byte strings were copied from png.h. If a future libpng - * version recognizes more chunks, add them to this list. If a - * future version of readpng2.c recognizes more chunks, delete them - * from this list. */ - static /* const */ png_byte chunks_to_ignore[] = { - 99, 72, 82, 77, '\0', /* cHRM */ - 104, 73, 83, 84, '\0', /* hIST */ - 105, 67, 67, 80, '\0', /* iCCP */ - 105, 84, 88, 116, '\0', /* iTXt */ - 111, 70, 70, 115, '\0', /* oFFs */ - 112, 67, 65, 76, '\0', /* pCAL */ - 112, 72, 89, 115, '\0', /* pHYs */ - 115, 66, 73, 84, '\0', /* sBIT */ - 115, 67, 65, 76, '\0', /* sCAL */ - 115, 80, 76, 84, '\0', /* sPLT */ - 115, 84, 69, 82, '\0', /* sTER */ - 116, 69, 88, 116, '\0', /* tEXt */ - 116, 73, 77, 69, '\0', /* tIME */ - 122, 84, 88, 116, '\0' /* zTXt */ + /* These byte strings were copied from png.h. If a future version + * of readpng2.c recognizes more chunks, add them to this list. + */ + static PNG_CONST png_byte chunks_to_process[] = { + 98, 75, 71, 68, '\0', /* bKGD */ + 103, 65, 77, 65, '\0', /* gAMA */ + 115, 82, 71, 66, '\0', /* sRGB */ }; - png_set_keep_unknown_chunks(png_ptr, 1 /* PNG_HANDLE_CHUNK_NEVER */, - chunks_to_ignore, sizeof(chunks_to_ignore)/5); + /* Ignore all chunks except for IHDR, PLTE, tRNS, IDAT, and IEND */ + png_set_keep_unknown_chunks(png_ptr, -1 /* PNG_HANDLE_CHUNK_NEVER */, + NULL, -1); + + /* But do not ignore chunks in the "chunks_to_process" list */ + png_set_keep_unknown_chunks(png_ptr, + 0 /* PNG_HANDLE_CHUNK_AS_DEFAULT */, chunks_to_process, + sizeof(chunks_to_process)/5); } #endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/contrib/libtests/gentests.sh libpng-1.6.0beta32/contrib/libtests/gentests.sh --- libpng-1.5.13/contrib/libtests/gentests.sh 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/gentests.sh 2012-11-25 12:40:12.851801732 -0600 @@ -0,0 +1,102 @@ +#!/bin/sh +# +# Copyright (c) 2012 John Cunningham Bowler +# +# Last changed in libpng 1.6.0 [(PENDING RELEASE)] +# +# This code is released under the libpng license. +# For conditions of distribution and use, see the disclaimer +# and license in png.h +# +# Generate a set of PNG test images. The images are generated in a +# sub-directory called 'tests' by default, however a command line argument will +# change that name. The generation requires a built version of makepng in the +# current directory. +# +usage(){ + exec >&2 + echo "$0 []" + echo ' Generate a set of PNG test files in "directory" ("tests" by default)' + exit 1 +} + +mp="$PWD/makepng" +test -x "$mp" || { + exec >&2 + echo "$0: the 'makepng' program must exist" + echo " in the directory within which this program:" + echo " $mp" + echo " is executed" + usage +} + +# Just one argument: the directory +testdir="tests" +test $# -gt 1 && { + testdir="$1" + shift +} +test $# -eq 0 || usage + +# Take care not to clobber something +if test -e "$testdir" +then + test -d "$testdir" || usage +else + # mkdir -p isn't portable, so do the following + mkdir "$testdir" 2>/dev/null || mkdir -p "$testdir" || usage +fi + +# This fails in a very satisfactory way if it's not accessible +cd "$testdir" +:>"test$$.png" || { + exec >&2 + echo "$testdir: directory not writable" + usage +} +rm "test$$.png" || { + exec >&2 + echo "$testdir: you have create but not write privileges here." + echo " This is unexpected. You have a spurion; "'"'"test$$.png"'"'"." + echo " You need to remove this yourself. Try a different directory." + exit 1 +} + +# Now call makepng ($mp) to create every file we can think of with a +# reasonable name +doit(){ + for gamma in "" --sRGB --linear --1.8 + do + case "$gamma" in + "") + gname=;; + --sRGB) + gname="-srgb";; + --linear) + gname="-lin";; + --1.8) + gname="-18";; + *) + gname="-$gamma";; + esac + "$mp" $gamma "$1" "$2" "test-$1-$2$gname.png" + done +} +# +for ct in gray palette +do + for bd in 1 2 4 8 + do + doit "$ct" "$bd" + done +done +# +doit "gray" "16" +# +for ct in gray-alpha rgb rgb-alpha +do + for bd in 8 16 + do + doit "$ct" "$bd" + done +done diff -ru4NwbB libpng-1.5.13/contrib/libtests/makepng.c libpng-1.6.0beta32/contrib/libtests/makepng.c --- libpng-1.5.13/contrib/libtests/makepng.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/makepng.c 2012-11-25 12:40:12.867283549 -0600 @@ -0,0 +1,1486 @@ +/* makepng.c + * + * Copyright (c) 2012 John Cunningham Bowler + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * Make a test PNG image. The arguments are as follows: + * + * makepng [--sRGB|--linear|--1.8] [--color=] color-type bit-depth \ + * [file-name] + * + * The color-type may be numeric (and must match the numbers used by the PNG + * specification) or one of the format names listed below. The bit-depth is the + * component bit depth, or the pixel bit-depth for a color-mapped image. + * + * Without any options no color-space information is written, with the options + * an sRGB or the appropriate gAMA chunk is written. "1.8" refers to the + * display system used on older Apple computers to correct for high ambient + * light levels in the viewing environment; it applies a transform of + * approximately value^(1/1.45) to the color values and so a gAMA chunk of 65909 + * is written (1.45/2.2). + * + * The image data is generated internally. Unless --color is given the images + * used are as follows: + * + * 1 channel: a square image with a diamond, the least luminous colors are on + * the edge of the image, the most luminous in the center. + * + * 2 channels: the color channel increases in luminosity from top to bottom, the + * alpha channel increases in opacity from left to right. + * + * 3 channels: linear combinations of, from the top-left corner clockwise, + * black, green, white, red. + * + * 4 channels: linear combinations of, from the top-left corner clockwise, + * transparent, red, green, blue. + * + * For color-mapped images a four channel color-map is used and the PNG file has + * a tRNS chunk, as follows: + * + * 1-bit: entry 0 is transparent-red, entry 1 is opaque-white + * 2-bit: entry 0: transparent-green + * entry 1: 40%-red + * entry 2: 80%-blue + * entry 3: opaque-white + * 4-bit: the 16 combinations of the 2-bit case + * 8-bit: the 256 combinations of the 4-bit case + * + * The palette always has 2^bit-depth entries and the tRNS chunk one fewer. The + * image is the 1-channel diamond, but using palette index, not luminosity. + * + * Image size is determined by the final pixel depth in bits, i.e. channels x + * bit-depth, as follows: + * + * 8 bits or less: 64x64 + * 16 bits: 256x256 + * More than 16 bits: 1024x1024 + * + * Row filtering is turned off (the 'none' filter is used on every row) and the + * images are not interlaced. + * + * If --color is given then the whole image has that color, color-mapped images + * will have exactly one palette entry and all image files with be 16x16 in + * size. The color value is 1 to 4 decimal numbers as appropriate for the color + * type. + * + * If file-name is given then the PNG is written to that file, else it is + * written to stdout. Notice that stdout is not supported on systems where, by + * default, it assumes text output; this program makes no attempt to change the + * text mode of stdout! + */ +#define _ISOC99_SOURCE /* for strtoull */ + +#include /* for offsetof */ +#include +#include +#include +#include +#include +#include + +#if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H) +# include +#endif + +/* Define the following to use this test against your installed libpng, rather + * than the one being built here: + */ +#ifdef PNG_FREESTANDING_TESTS +# include +#else +# include "../../png.h" +#endif + +/* This structure is used for inserting extra chunks (the --insert argument, not + * documented above.) + */ +typedef struct chunk_insert +{ + struct chunk_insert *next; + void (*insert)(png_structp, png_infop, int, png_charpp); + int nparams; + png_charp parameters[1]; +} chunk_insert; + +static int +channels_of_type(int color_type) +{ + if (color_type & PNG_COLOR_MASK_PALETTE) + return 1; + + else + { + int channels = 1; + + if (color_type & PNG_COLOR_MASK_COLOR) + channels = 3; + + if (color_type & PNG_COLOR_MASK_ALPHA) + return channels + 1; + + else + return channels; + } +} + +static int +pixel_depth_of_type(int color_type, int bit_depth) +{ + return channels_of_type(color_type) * bit_depth; +} + +static unsigned int +image_size_of_type(int color_type, int bit_depth, unsigned int *colors) +{ + if (*colors) + return 16; + + else + { + int pixel_depth = pixel_depth_of_type(color_type, bit_depth); + + if (pixel_depth < 8) + return 64; + + else if (pixel_depth > 16) + return 1024; + + else + return 256; + } +} + +static void +set_color(png_colorp color, png_bytep trans, unsigned int red, + unsigned int green, unsigned int blue, unsigned int alpha, + png_const_bytep gamma_table) +{ + color->red = gamma_table[red]; + color->green = gamma_table[green]; + color->blue = gamma_table[blue]; + *trans = (png_byte)alpha; +} + +static int +generate_palette(png_colorp palette, png_bytep trans, int bit_depth, + png_const_bytep gamma_table, unsigned int *colors) +{ + /* + * 1-bit: entry 0 is transparent-red, entry 1 is opaque-white + * 2-bit: entry 0: transparent-green + * entry 1: 40%-red + * entry 2: 80%-blue + * entry 3: opaque-white + * 4-bit: the 16 combinations of the 2-bit case + * 8-bit: the 256 combinations of the 4-bit case + */ + switch (colors[0]) + { + default: + fprintf(stderr, "makepng: --colors=...: invalid count %u\n", + colors[0]); + exit(1); + + case 1: + set_color(palette+0, trans+0, colors[1], colors[1], colors[1], 255, + gamma_table); + return 1; + + case 2: + set_color(palette+0, trans+0, colors[1], colors[1], colors[1], + colors[2], gamma_table); + return 1; + + case 3: + set_color(palette+0, trans+0, colors[1], colors[2], colors[3], 255, + gamma_table); + return 1; + + case 4: + set_color(palette+0, trans+0, colors[1], colors[2], colors[3], + colors[4], gamma_table); + return 1; + + case 0: + if (bit_depth == 1) + { + set_color(palette+0, trans+0, 255, 0, 0, 0, gamma_table); + set_color(palette+1, trans+1, 255, 255, 255, 255, gamma_table); + return 2; + } + + else + { + unsigned int size = 1U << (bit_depth/2); /* 2, 4 or 16 */ + unsigned int x, y, ip; + + for (x=0; x> 3; + + if (offset < rowbytes && (bit_depth < 16 || offset+1 < rowbytes)) + { + row += offset; + + switch (bit_depth) + { + case 1: + case 2: + case 4: + /* Don't gamma correct - values get smashed */ + { + unsigned int shift = (8 - bit_depth) - (x & 0x7U); + + mask <<= shift; + value = (value << shift) & mask; + *row = (png_byte)((*row & ~mask) | value); + } + return; + + default: + fprintf(stderr, "makepng: bad bit depth (internal error)\n"); + exit(1); + + case 16: + value = (unsigned int)floor(65535*pow(value/65535.,conv)+.5); + *row++ = (png_byte)(value >> 8); + *row = (png_byte)value; + return; + + case 8: + *row = gamma_table[value]; + return; + } + } + + else + { + fprintf(stderr, "makepng: row buffer overflow (internal error)\n"); + exit(1); + } + } + + else + { + fprintf(stderr, "makepng: component overflow (internal error)\n"); + exit(1); + } +} + +static void +generate_row(png_bytep row, size_t rowbytes, unsigned int y, int color_type, + int bit_depth, png_const_bytep gamma_table, double conv, + unsigned int *colors) +{ + png_uint_32 size_max = image_size_of_type(color_type, bit_depth, colors)-1; + png_uint_32 depth_max = (1U << bit_depth)-1; /* up to 65536 */ + + if (colors[0] == 0) switch (channels_of_type(color_type)) + { + /* 1 channel: a square image with a diamond, the least luminous colors are on + * the edge of the image, the most luminous in the center. + */ + case 1: + { + png_uint_32 x; + png_uint_32 base = 2*size_max - abs(2*y-size_max); + + for (x=0; x<=size_max; ++x) + { + png_uint_32 luma = base - abs(2*x-size_max); + + /* 'luma' is now in the range 0..2*size_max, we need + * 0..depth_max + */ + luma = (luma*depth_max + size_max) / (2*size_max); + set_value(row, rowbytes, x, bit_depth, luma, gamma_table, conv); + } + } + break; + + /* 2 channels: the color channel increases in luminosity from top to bottom, + * the alpha channel increases in opacity from left to right. + */ + case 2: + { + png_uint_32 alpha = (depth_max * y * 2 + size_max) / (2 * size_max); + png_uint_32 x; + + for (x=0; x<=size_max; ++x) + { + set_value(row, rowbytes, 2*x, bit_depth, + (depth_max * x * 2 + size_max) / (2 * size_max), gamma_table, + conv); + set_value(row, rowbytes, 2*x+1, bit_depth, alpha, gamma_table, + conv); + } + } + break; + + /* 3 channels: linear combinations of, from the top-left corner clockwise, + * black, green, white, red. + */ + case 3: + { + /* x0: the black->red scale (the value of the red component) at the + * start of the row (blue and green are 0). + * x1: the green->white scale (the value of the red and blue + * components at the end of the row; green is depth_max). + */ + png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max); + png_uint_32 x; + + /* Interpolate x/depth_max from start to end: + * + * start end difference + * red: Y Y 0 + * green: 0 depth_max depth_max + * blue: 0 Y Y + */ + for (x=0; x<=size_max; ++x) + { + set_value(row, rowbytes, 3*x+0, bit_depth, /* red */ Y, + gamma_table, conv); + set_value(row, rowbytes, 3*x+1, bit_depth, /* green */ + (depth_max * x * 2 + size_max) / (2 * size_max), + gamma_table, conv); + set_value(row, rowbytes, 3*x+2, bit_depth, /* blue */ + (Y * x * 2 + size_max) / (2 * size_max), + gamma_table, conv); + } + } + break; + + /* 4 channels: linear combinations of, from the top-left corner clockwise, + * transparent, red, green, blue. + */ + case 4: + { + /* x0: the transparent->blue scale (the value of the blue and alpha + * components) at the start of the row (red and green are 0). + * x1: the red->green scale (the value of the red and green + * components at the end of the row; blue is 0 and alpha is + * depth_max). + */ + png_uint_32 Y = (depth_max * y * 2 + size_max) / (2 * size_max); + png_uint_32 x; + + /* Interpolate x/depth_max from start to end: + * + * start end difference + * red: 0 depth_max-Y depth_max-Y + * green: 0 Y Y + * blue: Y 0 -Y + * alpha: Y depth_max depth_max-Y + */ + for (x=0; x<=size_max; ++x) + { + set_value(row, rowbytes, 4*x+0, bit_depth, /* red */ + ((depth_max-Y) * x * 2 + size_max) / (2 * size_max), + gamma_table, conv); + set_value(row, rowbytes, 4*x+1, bit_depth, /* green */ + (Y * x * 2 + size_max) / (2 * size_max), + gamma_table, conv); + set_value(row, rowbytes, 4*x+2, bit_depth, /* blue */ + Y - (Y * x * 2 + size_max) / (2 * size_max), + gamma_table, conv); + set_value(row, rowbytes, 4*x+3, bit_depth, /* alpha */ + Y + ((depth_max-Y) * x * 2 + size_max) / (2 * size_max), + gamma_table, conv); + } + } + break; + + default: + fprintf(stderr, "makepng: internal bad channel count\n"); + exit(2); + } + + else if (color_type & PNG_COLOR_MASK_PALETTE) + { + /* Palette with fixed color: the image rows are all 0 and the image width + * is 16. + */ + memset(row, rowbytes, 0); + } + + else if (colors[0] == channels_of_type(color_type)) + switch (channels_of_type(color_type)) + { + case 1: + { + const png_uint_32 luma = colors[1]; + png_uint_32 x; + + for (x=0; x<=size_max; ++x) + set_value(row, rowbytes, x, bit_depth, luma, gamma_table, + conv); + } + break; + + case 2: + { + const png_uint_32 luma = colors[1]; + const png_uint_32 alpha = colors[2]; + png_uint_32 x; + + for (x=0; x 0 && gamma < 1000) + gamma = PNG_FP_1; + + if (gamma > 0) + real_gamma = gamma; + + { + unsigned int i; + + if (real_gamma == 45455) for (i=0; i<256; ++i) + { + gamma_table[i] = (png_byte)i; + conv = 1.; + } + + else + { + /* Convert 'i' from sRGB (45455) to real_gamma, this makes + * the images look the same regardless of the gAMA chunk. + */ + conv = real_gamma; + conv /= 45455; + + gamma_table[0] = 0; + + for (i=0; i<255; ++i) + gamma_table[i] = (png_byte)floor(pow(i/255.,conv) * 255 + 127.5); + + gamma_table[255] = 255; + } + } + + png_set_IHDR(png_ptr, info_ptr, size, size, bit_depth, color_type, + PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); + + if (color_type & PNG_COLOR_MASK_PALETTE) + { + int npalette; + png_color palette[256]; + png_byte trans[256]; + + npalette = generate_palette(palette, trans, bit_depth, gamma_table, + colors); + png_set_PLTE(png_ptr, info_ptr, palette, npalette); + png_set_tRNS(png_ptr, info_ptr, trans, npalette-1, + NULL/*transparent color*/); + + /* Reset gamma_table to prevent the image rows being changed */ + for (npalette=0; npalette<256; ++npalette) + gamma_table[npalette] = (png_byte)npalette; + } + + if (gamma == PNG_DEFAULT_sRGB) + png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_ABSOLUTE); + + else if (gamma > 0) /* Else don't set color space information */ + { + png_set_gAMA_fixed(png_ptr, info_ptr, real_gamma); + + /* Just use the sRGB values here. */ + png_set_cHRM_fixed(png_ptr, info_ptr, + /* color x y */ + /* white */ 31270, 32900, + /* red */ 64000, 33000, + /* green */ 30000, 60000, + /* blue */ 15000, 6000 + ); + } + + /* Insert extra information. */ + while (insert != NULL) + { + insert->insert(png_ptr, info_ptr, insert->nparams, insert->parameters); + insert = insert->next; + } + + /* Write the file header. */ + png_write_info(png_ptr, info_ptr); + + /* Restrict the filters */ + png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, filters); + + { + int passes = png_set_interlace_handling(png_ptr); + int pass; + png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr); + + row = malloc(rowbytes); + + if (row == NULL) + png_error(png_ptr, "OOM allocating row buffer"); + + for (pass = 0; pass < passes; ++pass) + { + unsigned int y; + + for (y=0; y 0) + { + /* Round up to a multiple of 4 here to allow an iCCP profile + * to be padded to a 4x boundary. + */ + png_bytep data = malloc((total+3)&~3); + + if (data != NULL) + { + size_t new_size = 0; + + for (;;) + { + ch = getc(fp); + if (ch == EOF) break; + data[new_size++] = (png_byte)ch; + } + + if (ferror(fp) || new_size != total) + { + perror("temporary file"); + fprintf(stderr, "temporary file read error\n"); + free(data); + } + + else + { + (void)fclose(fp); + *result = data; + return total; + } + } + + else + fprintf(stderr, "%s: out of memory loading file\n", name); + } + + else + fprintf(stderr, "%s: empty file\n", name); + } + } + } + + else + { + perror(name); + fprintf(stderr, "%s: open failed\n", name); + } + + fclose(fp); + } + + else + fprintf(stderr, "makepng: %s: could not open temporary file\n", name); + + exit(1); + return 0; +} + +static png_size_t +load_fake(png_charp param, png_bytepp profile) +{ + char *endptr = NULL; + unsigned long long int size = strtoull(param, &endptr, 0/*base*/); + + /* The 'fake' format is *[string] */ + if (endptr != NULL && *endptr == '*') + { + size_t len = strlen(++endptr); + size_t result = (size_t)size; + + if (len == 0) len = 1; /* capture the terminating '\0' */ + + /* Now repeat that string to fill 'size' bytes. */ + if (result == size && (*profile = malloc(result)) != NULL) + { + png_bytep out = *profile; + + if (len == 1) + memset(out, *endptr, result); + + else + { + while (size >= len) + { + memcpy(out, endptr, len); + out += len; + size -= len; + } + memcpy(out, endptr, size); + } + + return result; + } + + else + { + fprintf(stderr, "%s: size exceeds system limits\n", param); + exit(1); + } + } + + return 0; +} + +static void +check_param_count(int nparams, int expect) +{ + if (nparams != expect) + { + fprintf(stderr, "bad parameter count (internal error)\n"); + exit(1); + } +} + +static void +insert_iCCP(png_structp png_ptr, png_infop info_ptr, int nparams, + png_charpp params) +{ + png_bytep profile = NULL; + png_uint_32 proflen = 0; + int result; + + check_param_count(nparams, 2); + + switch (params[1][0]) + { + case '<': + { + png_size_t filelen = load_file(params[1]+1, &profile); + if (filelen > 0xfffffffc) /* Maximum profile length */ + { + fprintf(stderr, "%s: file too long (%lu) for an ICC profile\n", + params[1]+1, (unsigned long)filelen); + exit(1); + } + + proflen = (png_uint_32)filelen; + } + break; + + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + png_size_t fake_len = load_fake(params[1], &profile); + + if (fake_len > 0) /* else a simple parameter */ + { + if (fake_len > 0xffffffff) /* Maximum profile length */ + { + fprintf(stderr, + "%s: fake data too long (%lu) for an ICC profile\n", + params[1], (unsigned long)fake_len); + exit(1); + } + proflen = (png_uint_32)(fake_len & ~3U); + /* Always fix up the profile length. */ + png_save_uint_32(profile, proflen); + break; + } + } + + default: + fprintf(stderr, "--insert iCCP \"%s\": unrecognized\n", params[1]); + fprintf(stderr, " use '<' to read a file: \" 3) + { + png_uint_32 prof_header = png_get_uint_32(profile); + + if (prof_header != proflen) + { + fprintf(stderr, "--insert iCCP %s: profile length field wrong:\n", + params[1]); + fprintf(stderr, " actual %lu, recorded value %lu (corrected)\n", + (unsigned long)proflen, (unsigned long)prof_header); + png_save_uint_32(profile, proflen); + } + } + + if (result && profile != NULL && proflen >=4) + png_set_iCCP(png_ptr, info_ptr, params[0], PNG_COMPRESSION_TYPE_BASE, + profile, proflen); + + if (profile) + free(profile); + + if (!result) + exit(1); +} + +static void +clear_text(png_text *text, png_charp keyword) +{ + text->compression = -1; /* none */ + text->key = keyword; + text->text = NULL; + text->text_length = 0; /* libpng calculates this */ + text->itxt_length = 0; /* libpng calculates this */ + text->lang = NULL; + text->lang_key = NULL; +} + +static void +set_text(png_structp png_ptr, png_infop info_ptr, png_textp text, + png_charp param) +{ + switch (param[0]) + { + case '<': + { + png_bytep file = NULL; + + text->text_length = load_file(param+1, &file); + text->text = (png_charp)file; + } + break; + + case '0': case '1': case '2': case '3': case '4': + case '5': case '6': case '7': case '8': case '9': + { + png_bytep data = NULL; + png_size_t fake_len = load_fake(param, &data); + + if (fake_len > 0) /* else a simple parameter */ + { + text->text_length = fake_len; + text->text = (png_charp)data; + break; + } + } + + default: + text->text = param; + break; + } + + png_set_text(png_ptr, info_ptr, text, 1); + + if (text->text != param) + free(text->text); +} + +static void +insert_tEXt(png_structp png_ptr, png_infop info_ptr, int nparams, + png_charpp params) +{ + png_text text; + + check_param_count(nparams, 2); + clear_text(&text, params[0]); + set_text(png_ptr, info_ptr, &text, params[1]); +} + +static void +insert_zTXt(png_structp png_ptr, png_infop info_ptr, int nparams, + png_charpp params) +{ + png_text text; + + check_param_count(nparams, 2); + clear_text(&text, params[0]); + text.compression = 0; /* deflate */ + set_text(png_ptr, info_ptr, &text, params[1]); +} + +static void +insert_iTXt(png_structp png_ptr, png_infop info_ptr, int nparams, + png_charpp params) +{ + png_text text; + + check_param_count(nparams, 4); + clear_text(&text, params[0]); + text.compression = 2; /* iTXt + deflate */ + text.lang = params[1];/* language tag */ + text.lang_key = params[2]; /* translated keyword */ + set_text(png_ptr, info_ptr, &text, params[3]); +} + +static void +insert_hIST(png_structp png_ptr, png_infop info_ptr, int nparams, png_charpp params) +{ + int i; + png_uint_16 freq[256]; + + /* libpng takes the count from the PLTE count; we don't check it here but we + * do set the array to 0 for unspecified entries. + */ + memset(freq, 0, sizeof freq); + for (i=0; inext = NULL; + cip->insert = insert; + cip->nparams = nparams; + for (i=0; iparameters[i] = list[i]; + + return cip; +} + +static chunk_insert * +find_insert(png_const_charp what, png_charp param) +{ + png_uint_32 chunk = 0; + png_charp parameter_list[1024]; + int i, nparams; + + /* Assemble the chunk name */ + for (i=0; i<4; ++i) + { + char ch = what[i]; + + if ((ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122)) + chunk = (chunk << 8) + what[i]; + + else + break; + } + + if (i < 4 || what[4] != 0) + { + fprintf(stderr, "makepng --insert \"%s\": invalid chunk name\n", what); + exit(1); + } + + /* Assemble the parameter list. */ + nparams = find_parameters(what, param, parameter_list, 1024); + +# define CHUNK(a,b,c,d) (((a)<<24)+((b)<<16)+((c)<<8)+(d)) + + switch (chunk) + { + case CHUNK(105,67,67,80): /* iCCP */ + if (nparams == 2) + return make_insert(what, insert_iCCP, nparams, parameter_list); + break; + + case CHUNK(116,69,88,116): /* tEXt */ + if (nparams == 2) + return make_insert(what, insert_tEXt, nparams, parameter_list); + break; + + case CHUNK(122,84,88,116): /* zTXt */ + if (nparams == 2) + return make_insert(what, insert_zTXt, nparams, parameter_list); + break; + + case CHUNK(105,84,88,116): /* iTXt */ + if (nparams == 4) + return make_insert(what, insert_iTXt, nparams, parameter_list); + break; + + case CHUNK(104,73,83,84): /* hIST */ + if (nparams <= 256) + return make_insert(what, insert_hIST, nparams, parameter_list); + break; + +#if 0 + case CHUNK(115,80,76,84): /* sPLT */ + return make_insert(what, insert_sPLT, nparams, parameter_list); +#endif + + default: + fprintf(stderr, "makepng --insert \"%s\": unrecognized chunk name\n", + what); + exit(1); + } + + bad_parameter_count(what, nparams); + return NULL; +} + +/* This is a not-very-good parser for a sequence of numbers (including 0). It + * doesn't accept some apparently valid things, but it accepts all the sensible + * combinations. + */ +static void +parse_color(char *arg, unsigned int *colors) +{ + unsigned int ncolors = 0; + + while (*arg && ncolors < 4) + { + char *ep = arg; + + unsigned long ul = strtoul(arg, &ep, 0); + + if (ul > 65535) + { + fprintf(stderr, "makepng --color=...'%s': too big\n", arg); + exit(1); + } + + if (ep == arg) + { + fprintf(stderr, "makepng --color=...'%s': not a valid color\n", arg); + exit(1); + } + + if (*ep) ++ep; /* skip a separator */ + arg = ep; + + colors[++ncolors] = (unsigned int)ul; /* checked above */ + } + + if (*arg) + { + fprintf(stderr, "makepng --color=...'%s': too many values\n", arg); + exit(1); + } + + *colors = ncolors; +} + +int +main(int argc, char **argv) +{ + FILE *fp = stdout; + const char *file_name = NULL; + int color_type = 8; /* invalid */ + int bit_depth = 32; /* invalid */ + unsigned int colors[5]; + unsigned int filters = PNG_ALL_FILTERS; + png_fixed_point gamma = 0; /* not set */ + chunk_insert *head_insert = NULL; + chunk_insert **insert_ptr = &head_insert; + + memset(colors, 0, sizeof colors); + + while (--argc > 0) + { + char *arg = *++argv; + + if (strcmp(arg, "--sRGB") == 0) + { + gamma = PNG_DEFAULT_sRGB; + continue; + } + + if (strcmp(arg, "--linear") == 0) + { + gamma = PNG_FP_1; + continue; + } + + if (strcmp(arg, "--1.8") == 0) + { + gamma = PNG_GAMMA_MAC_18; + continue; + } + + if (strcmp(arg, "--nofilters") == 0) + { + filters = PNG_FILTER_NONE; + continue; + } + + if (strncmp(arg, "--color=", 8) == 0) + { + parse_color(arg+8, colors); + continue; + } + + if (argc >= 3 && strcmp(arg, "--insert") == 0) + { + png_const_charp what = *++argv; + png_charp param = *++argv; + chunk_insert *new_insert; + + argc -= 2; + + new_insert = find_insert(what, param); + + if (new_insert != NULL) + { + *insert_ptr = new_insert; + insert_ptr = &new_insert->next; + } + + continue; + } + + if (arg[0] == '-') + { + fprintf(stderr, "makepng: %s: invalid option\n", arg); + exit(1); + } + + if (strcmp(arg, "palette") == 0) + { + color_type = PNG_COLOR_TYPE_PALETTE; + continue; + } + + if (strncmp(arg, "gray", 4) == 0) + { + if (arg[4] == 0) + { + color_type = PNG_COLOR_TYPE_GRAY; + continue; + } + + else if (strcmp(arg+4, "a") == 0 || + strcmp(arg+4, "alpha") == 0 || + strcmp(arg+4, "-alpha") == 0) + { + color_type = PNG_COLOR_TYPE_GRAY_ALPHA; + continue; + } + } + + if (strncmp(arg, "rgb", 3) == 0) + { + if (arg[3] == 0) + { + color_type = PNG_COLOR_TYPE_RGB; + continue; + } + + else if (strcmp(arg+3, "a") == 0 || + strcmp(arg+3, "alpha") == 0 || + strcmp(arg+3, "-alpha") == 0) + { + color_type = PNG_COLOR_TYPE_RGB_ALPHA; + continue; + } + } + + if (color_type == 8 && isdigit(arg[0])) + { + color_type = atoi(arg); + if (color_type < 0 || color_type > 6 || color_type == 1 || + color_type == 5) + { + fprintf(stderr, "makepng: %s: not a valid color type\n", arg); + exit(1); + } + + continue; + } + + if (bit_depth == 32 && isdigit(arg[0])) + { + bit_depth = atoi(arg); + if (bit_depth <= 0 || bit_depth > 16 || + (bit_depth & -bit_depth) != bit_depth) + { + fprintf(stderr, "makepng: %s: not a valid bit depth\n", arg); + exit(1); + } + + continue; + } + + if (argc == 1) /* It's the file name */ + { + fp = fopen(arg, "wb"); + if (fp == NULL) + { + fprintf(stderr, "%s: %s: could not open\n", arg, strerror(errno)); + exit(1); + } + + file_name = arg; + continue; + } + + fprintf(stderr, "makepng: %s: unknown argument\n", arg); + exit(1); + } /* argument while loop */ + + if (color_type == 8 || bit_depth == 32) + { + fprintf(stderr, "usage: makepng [--sRGB|--linear|--1.8] " + "[--color=...] color-type bit-depth [file-name]\n" + " Make a test PNG file, by default writes to stdout.\n"); + exit(1); + } + + /* Check the colors */ + { + const unsigned int lim = (color_type == PNG_COLOR_TYPE_PALETTE ? 255U : + (1U< lim) + { + fprintf(stderr, "makepng: --color=...: %u out of range [0..%u]\n", + colors[i], lim); + exit(1); + } + } + + /* Restrict the filters for more speed to those we know are used for the + * generated images. + */ + if (filters == PNG_ALL_FILTERS) + { + if ((color_type & PNG_COLOR_MASK_PALETTE) != 0 || bit_depth < 8) + filters = PNG_FILTER_NONE; + + else if (color_type & PNG_COLOR_MASK_COLOR) /* rgb */ + { + if (bit_depth == 8) + filters &= ~(PNG_FILTER_NONE | PNG_FILTER_AVG); + + else + filters = PNG_FILTER_SUB | PNG_FILTER_PAETH; + } + + else /* gray 8 or 16-bit */ + filters &= ~PNG_FILTER_NONE; + } + + { + int ret = write_png(&file_name, fp, color_type, bit_depth, gamma, + head_insert, filters, colors); + + if (ret != 0 && file_name != NULL) + remove(file_name); + + return ret; + } +} diff -ru4NwbB libpng-1.5.13/contrib/libtests/pngstest.c libpng-1.6.0beta32/contrib/libtests/pngstest.c --- libpng-1.5.13/contrib/libtests/pngstest.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/pngstest.c 2012-11-25 12:40:12.888049401 -0600 @@ -0,0 +1,3700 @@ +/*- + * pngstest.c + * + * Copyright (c) 2012 John Cunningham Bowler + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * Test for the PNG 'simplified' APIs. + */ +#define _ISOC90_SOURCE 1 +#define MALLOC_CHECK_ 2/*glibc facility: turn on debugging*/ + +#include +#include +#include +#include +#include +#include +#include + +#if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H) +# include +#endif + +/* Define the following to use this test against your installed libpng, rather + * than the one being built here: + */ +#ifdef PNG_FREESTANDING_TESTS +# include +#else +# include "../../png.h" +#endif + +#ifdef PNG_SIMPLIFIED_READ_SUPPORTED /* Else nothing can be done */ +#include "../tools/sRGB.h" + +/* KNOWN ISSUES + * + * These defines switch on alternate algorithms for format conversions to match + * the current libpng implementation; they are set to allow pngstest to pass + * even though libpng is producing answers that are not as correct as they + * should be. + */ +#define ALLOW_UNUSED_GPC 0 + /* If true include unused static GPC functions and declare an external array + * of them to hide the fact that they are unused. This is for development + * use while testing the correct function to use to take into account libpng + * misbehavior, such as using a simple power law to correct sRGB to linear. + */ + +/* The following is to support direct compilation of this file as C++ */ +#ifdef __cplusplus +# define voidcast(type, value) static_cast(value) +# define aligncastconst(type, value) \ + static_cast(static_cast(value)) +#else +# define voidcast(type, value) (value) +# define aligncastconst(type, value) ((const void*)(value)) +#endif /* __cplusplus */ + +/* Generate random bytes. This uses a boring repeatable algorithm and it + * is implemented here so that it gives the same set of numbers on every + * architecture. It's a linear congruential generator (Knuth or Sedgewick + * "Algorithms") but it comes from the 'feedback taps' table in Horowitz and + * Hill, "The Art of Electronics". + */ +static void +make_random_bytes(png_uint_32* seed, void* pv, size_t size) +{ + png_uint_32 u0 = seed[0], u1 = seed[1]; + png_bytep bytes = voidcast(png_bytep, pv); + + /* There are thirty three bits, the next bit in the sequence is bit-33 XOR + * bit-20. The top 1 bit is in u1, the bottom 32 are in u0. + */ + size_t i; + for (i=0; i> (20-8)) ^ ((u1 << 7) | (u0 >> (32-7)))) & 0xff; + u1 <<= 8; + u1 |= u0 >> 24; + u0 <<= 8; + u0 |= u; + *bytes++ = (png_byte)u; + } + + seed[0] = u0; + seed[1] = u1; +} + +static void +random_color(png_colorp color) +{ + static png_uint_32 color_seed[2] = { 0x12345678, 0x9abcdef }; + make_random_bytes(color_seed, color, sizeof *color); +} + +/* Math support - neither Cygwin nor Visual Studio have C99 support and we need + * a predictable rounding function, so make one here: + */ +static double +closestinteger(double x) +{ + return floor(x + .5); +} + +/* Cast support: remove GCC whines. */ +static png_byte +u8d(double d) +{ + d = closestinteger(d); + return (png_byte)d; +} + +static png_uint_16 +u16d(double d) +{ + d = closestinteger(d); + return (png_uint_16)d; +} + +/* sRGB support: use exact calculations rounded to the nearest int, see the + * fesetround() call in main(). sRGB_to_d optimizes the 8 to 16-bit conversion. + */ +static double sRGB_to_d[256]; +static double g22_to_d[256]; + +static void +init_sRGB_to_d(void) +{ + int i; + + sRGB_to_d[0] = 0; + for (i=1; i<255; ++i) + sRGB_to_d[i] = linear_from_sRGB(i/255.); + sRGB_to_d[255] = 1; + + g22_to_d[0] = 0; + for (i=1; i<255; ++i) + g22_to_d[i] = pow(i/255., 1/.45455); + g22_to_d[255] = 1; +} + +static png_byte +sRGB(double linear /*range 0.0 .. 1.0*/) +{ + return u8d(255 * sRGB_from_linear(linear)); +} + +static png_byte +isRGB(int fixed_linear) +{ + return sRGB(fixed_linear / 65535.); +} + +#if 0 /* not used */ +static png_byte +unpremultiply(int component, int alpha) +{ + if (alpha <= component) + return 255; /* Arbitrary, but consistent with the libpng code */ + + else if (alpha >= 65535) + return isRGB(component); + + else + return sRGB((double)component / alpha); +} +#endif + +static png_uint_16 +ilinear(int fixed_srgb) +{ + return u16d(65535 * sRGB_to_d[fixed_srgb]); +} + +static png_uint_16 +ilineara(int fixed_srgb, int alpha) +{ + return u16d((257 * alpha) * sRGB_to_d[fixed_srgb]); +} + +static png_uint_16 +ilinear_g22(int fixed_srgb) +{ + return u16d(65535 * g22_to_d[fixed_srgb]); +} + +#if ALLOW_UNUSED_GPC +static png_uint_16 +ilineara_g22(int fixed_srgb, int alpha) +{ + return u16d((257 * alpha) * g22_to_d[fixed_srgb]); +} +#endif + +static double +YfromRGBint(int ir, int ig, int ib) +{ + double r = ir; + double g = ig; + double b = ib; + return YfromRGB(r, g, b); +} + +#if 0 /* unused */ +/* The error that results from using a 2.2 power law in place of the correct + * sRGB transform, given an 8-bit value which might be either sRGB or power-law. + */ +static int +power_law_error8(int value) +{ + if (value > 0 && value < 255) + { + double vd = value / 255.; + double e = fabs( + pow(sRGB_to_d[value], 1/2.2) - sRGB_from_linear(pow(vd, 2.2))); + + /* Always allow an extra 1 here for rounding errors */ + e = 1+floor(255 * e); + return (int)e; + } + + return 0; +} + +static int error_in_sRGB_roundtrip = 56; /* by experiment */ +static int +power_law_error16(int value) +{ + if (value > 0 && value < 65535) + { + /* Round trip the value through an 8-bit representation but using + * non-matching to/from conversions. + */ + double vd = value / 65535.; + double e = fabs( + pow(sRGB_from_linear(vd), 2.2) - linear_from_sRGB(pow(vd, 1/2.2))); + + /* Always allow an extra 1 here for rounding errors */ + e = error_in_sRGB_roundtrip+floor(65535 * e); + return (int)e; + } + + return 0; +} + +static int +compare_8bit(int v1, int v2, int error_limit, int multiple_algorithms) +{ + int e = abs(v1-v2); + int ev1, ev2; + + if (e <= error_limit) + return 1; + + if (!multiple_algorithms) + return 0; + + ev1 = power_law_error8(v1); + if (e <= ev1) + return 1; + + ev2 = power_law_error8(v2); + if (e <= ev2) + return 1; + + return 0; +} + +static int +compare_16bit(int v1, int v2, int error_limit, int multiple_algorithms) +{ + int e = abs(v1-v2); + int ev1, ev2; + + if (e <= error_limit) + return 1; + + /* "multiple_algorithms" in this case means that a color-map has been + * involved somewhere, so we can deduce that the values were forced to 8-bit + * (like the via_linear case for 8-bit.) + */ + if (!multiple_algorithms) + return 0; + + ev1 = power_law_error16(v1); + if (e <= ev1) + return 1; + + ev2 = power_law_error16(v2); + if (e <= ev2) + return 1; + + return 0; +} +#endif /* unused */ + +#define READ_FILE 1 /* else memory */ +#define USE_STDIO 2 /* else use file name */ +#define STRICT 4 /* fail on warnings too */ +#define VERBOSE 8 +#define KEEP_TMPFILES 16 /* else delete temporary files */ +#define KEEP_GOING 32 +#define ACCUMULATE 64 +#define FAST_WRITE 128 + +static void +print_opts(png_uint_32 opts) +{ + if (opts & READ_FILE) + printf(" --file"); + if (opts & USE_STDIO) + printf(" --stdio"); + if (opts & STRICT) + printf(" --strict"); + if (opts & VERBOSE) + printf(" --verbose"); + if (opts & KEEP_TMPFILES) + printf(" --preserve"); + if (opts & KEEP_GOING) + printf(" --keep-going"); + if (opts & ACCUMULATE) + printf(" --accumulate"); + if (!(opts & FAST_WRITE)) /* --fast is currently the default */ + printf(" --slow"); +} + +#define FORMAT_NO_CHANGE 0x80000000 /* additional flag */ + +/* A name table for all the formats - defines the format of the '+' arguments to + * pngstest. + */ +#define FORMAT_COUNT 64 +#define FORMAT_MASK 0x3f +static PNG_CONST char * PNG_CONST format_names[FORMAT_COUNT] = +{ + "sRGB-gray", + "sRGB-gray+alpha", + "sRGB-rgb", + "sRGB-rgb+alpha", + "linear-gray", + "linear-gray+alpha", + "linear-rgb", + "linear-rgb+alpha", + + "color-mapped-sRGB-gray", + "color-mapped-sRGB-gray+alpha", + "color-mapped-sRGB-rgb", + "color-mapped-sRGB-rgb+alpha", + "color-mapped-linear-gray", + "color-mapped-linear-gray+alpha", + "color-mapped-linear-rgb", + "color-mapped-linear-rgb+alpha", + + "sRGB-gray", + "sRGB-gray+alpha", + "sRGB-bgr", + "sRGB-bgr+alpha", + "linear-gray", + "linear-gray+alpha", + "linear-bgr", + "linear-bgr+alpha", + + "color-mapped-sRGB-gray", + "color-mapped-sRGB-gray+alpha", + "color-mapped-sRGB-bgr", + "color-mapped-sRGB-bgr+alpha", + "color-mapped-linear-gray", + "color-mapped-linear-gray+alpha", + "color-mapped-linear-bgr", + "color-mapped-linear-bgr+alpha", + + "sRGB-gray", + "alpha+sRGB-gray", + "sRGB-rgb", + "alpha+sRGB-rgb", + "linear-gray", + "alpha+linear-gray", + "linear-rgb", + "alpha+linear-rgb", + + "color-mapped-sRGB-gray", + "color-mapped-alpha+sRGB-gray", + "color-mapped-sRGB-rgb", + "color-mapped-alpha+sRGB-rgb", + "color-mapped-linear-gray", + "color-mapped-alpha+linear-gray", + "color-mapped-linear-rgb", + "color-mapped-alpha+linear-rgb", + + "sRGB-gray", + "alpha+sRGB-gray", + "sRGB-bgr", + "alpha+sRGB-bgr", + "linear-gray", + "alpha+linear-gray", + "linear-bgr", + "alpha+linear-bgr", + + "color-mapped-sRGB-gray", + "color-mapped-alpha+sRGB-gray", + "color-mapped-sRGB-bgr", + "color-mapped-alpha+sRGB-bgr", + "color-mapped-linear-gray", + "color-mapped-alpha+linear-gray", + "color-mapped-linear-bgr", + "color-mapped-alpha+linear-bgr", +}; + +/* Decode an argument to a format number. */ +static png_uint_32 +formatof(const char *arg) +{ + char *ep; + unsigned long format = strtoul(arg, &ep, 0); + + if (ep > arg && *ep == 0 && format < FORMAT_COUNT) + return (png_uint_32)format; + + else for (format=0; format < FORMAT_COUNT; ++format) + { + if (strcmp(format_names[format], arg) == 0) + return (png_uint_32)format; + } + + fprintf(stderr, "pngstest: format name '%s' invalid\n", arg); + return FORMAT_COUNT; +} + +/* Bitset/test functions for formats */ +#define FORMAT_SET_COUNT (FORMAT_COUNT / 32) +typedef struct +{ + png_uint_32 bits[FORMAT_SET_COUNT]; +} +format_list; + +static void format_init(format_list *pf) +{ + int i; + for (i=0; ibits[i] = 0; /* All off */ +} + +#if 0 /* currently unused */ +static void format_clear(format_list *pf) +{ + int i; + for (i=0; ibits[i] = 0; +} +#endif + +static int format_is_initial(format_list *pf) +{ + int i; + for (i=0; ibits[i] != 0) + return 0; + + return 1; +} + +static int format_set(format_list *pf, png_uint_32 format) +{ + if (format < FORMAT_COUNT) + return pf->bits[format >> 5] |= ((png_uint_32)1) << (format & 31); + + return 0; +} + +#if 0 /* currently unused */ +static int format_unset(format_list *pf, png_uint_32 format) +{ + if (format < FORMAT_COUNT) + return pf->bits[format >> 5] &= ~((png_uint_32)1) << (format & 31); + + return 0; +} +#endif + +static int format_isset(format_list *pf, png_uint_32 format) +{ + return format < FORMAT_COUNT && + (pf->bits[format >> 5] & (((png_uint_32)1) << (format & 31))) != 0; +} + +static void format_default(format_list *pf, int redundant) +{ + if (redundant) + { + int i; + + /* set everything, including flags that are pointless */ + for (i=0; ibits[i] = ~(png_uint_32)0; + } + + else + { + png_uint_32 f; + + for (f=0; finput_file != NULL) + rewind(image->input_file); +} + +/* Free the image buffer; the buffer is re-used on a re-read, this is just for + * cleanup. + */ +static void +freebuffer(Image *image) +{ + if (image->buffer) free(image->buffer); + image->buffer = NULL; + image->bufsize = 0; + image->allocsize = 0; +} + +/* Delete function; cleans out all the allocated data and the temporary file in + * the image. + */ +static void +freeimage(Image *image) +{ + freebuffer(image); + png_image_free(&image->image); + + if (image->input_file != NULL) + { + fclose(image->input_file); + image->input_file = NULL; + } + + if (image->input_memory != NULL) + { + free(image->input_memory); + image->input_memory = NULL; + image->input_memory_size = 0; + } + + if (image->tmpfile_name[0] != 0 && (image->opts & KEEP_TMPFILES) == 0) + { + remove(image->tmpfile_name); + image->tmpfile_name[0] = 0; + } +} + +/* This is actually a re-initializer; allows an image structure to be re-used by + * freeing everything that relates to an old image. + */ +static void initimage(Image *image, png_uint_32 opts, const char *file_name, + int stride_extra) +{ + freeimage(image); + memset(&image->image, 0, sizeof image->image); + image->opts = opts; + image->file_name = file_name; + image->stride_extra = stride_extra; +} + +/* Make sure the image buffer is big enough; allows re-use of the buffer if the + * image is re-read. + */ +#define BUFFER_INIT8 73 +static void +allocbuffer(Image *image) +{ + png_size_t size = PNG_IMAGE_BUFFER_SIZE(image->image, image->stride); + + if (size+32 > image->bufsize) + { + freebuffer(image); + image->buffer = voidcast(png_bytep, malloc(size+32)); + if (image->buffer == NULL) + { + fflush(stdout); + fprintf(stderr, + "simpletest: out of memory allocating %lu(+32) byte buffer\n", + (unsigned long)size); + exit(1); + } + image->bufsize = size+32; + } + + memset(image->buffer, 95, image->bufsize); + memset(image->buffer+16, BUFFER_INIT8, size); + image->allocsize = size; +} + +/* Make sure 16 bytes match the given byte. */ +static int +check16(png_const_bytep bp, int b) +{ + int i = 16; + + do + if (*bp != b) return 1; + while (--i); + + return 0; +} + +/* Check for overwrite in the image buffer. */ +static void +checkbuffer(Image *image, const char *arg) +{ + if (check16(image->buffer, 95)) + { + fflush(stdout); + fprintf(stderr, "%s: overwrite at start of image buffer\n", arg); + exit(1); + } + + if (check16(image->buffer+16+image->allocsize, 95)) + { + fflush(stdout); + fprintf(stderr, "%s: overwrite at end of image buffer\n", arg); + exit(1); + } +} + +/* ERROR HANDLING */ +/* Log a terminal error, also frees the libpng part of the image if necessary. + */ +static int +logerror(Image *image, const char *a1, const char *a2, const char *a3) +{ + fflush(stdout); + if (image->image.warning_or_error) + fprintf(stderr, "%s%s%s: %s\n", a1, a2, a3, image->image.message); + + else + fprintf(stderr, "%s%s%s\n", a1, a2, a3); + + if (image->image.opaque != NULL) + { + fprintf(stderr, "%s: image opaque pointer non-NULL on error\n", + image->file_name); + png_image_free(&image->image); + } + + return 0; +} + +/* Log an error and close a file (just a utility to do both things in one + * function call.) + */ +static int +logclose(Image *image, FILE *f, const char *name, const char *operation) +{ + int e = errno; + + fclose(f); + return logerror(image, name, operation, strerror(e)); +} + +/* Make sure the png_image has been freed - validates that libpng is doing what + * the spec says and freeing the image. + */ +static int +checkopaque(Image *image) +{ + if (image->image.opaque != NULL) + { + png_image_free(&image->image); + return logerror(image, image->file_name, ": opaque not NULL", ""); + } + + else if (image->image.warning_or_error != 0 && (image->opts & STRICT) != 0) + return logerror(image, image->file_name, " --strict", ""); + + else + return 1; +} + +/* IMAGE COMPARISON/CHECKING */ +/* Compare the pixels of two images, which should be the same but aren't. The + * images must have been checked for a size match. + */ +typedef struct +{ + /* The components, for grayscale images the gray value is in 'g' and if alpha + * is not present 'a' is set to 255 or 65535 according to format. + */ + int r, g, b, a; +} Pixel; + +typedef struct +{ + /* The background as the original sRGB 8-bit value converted to the final + * integer format and as a double precision linear value in the range 0..1 + * for with partially transparent pixels. + */ + int ir, ig, ib; + double dr, dg, db; /* linear r,g,b scaled to 0..1 */ +} Background; + +/* Basic image formats; control the data but not the layout thereof. */ +#define BASE_FORMATS\ + (PNG_FORMAT_FLAG_ALPHA|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_LINEAR) + +/* Read a Pixel from a buffer. The code below stores the correct routine for + * the format in a function pointer, these are the routines: + */ +static void +gp_g8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = p->g = p->b = pp[0]; + p->a = 255; +} + +static void +gp_ga8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = p->g = p->b = pp[0]; + p->a = pp[1]; +} + +static void +gp_ag8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = p->g = p->b = pp[1]; + p->a = pp[0]; +} + +static void +gp_rgb8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = pp[0]; + p->g = pp[1]; + p->b = pp[2]; + p->a = 255; +} + +static void +gp_bgr8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = pp[2]; + p->g = pp[1]; + p->b = pp[0]; + p->a = 255; +} + +static void +gp_rgba8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = pp[0]; + p->g = pp[1]; + p->b = pp[2]; + p->a = pp[3]; +} + +static void +gp_bgra8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = pp[2]; + p->g = pp[1]; + p->b = pp[0]; + p->a = pp[3]; +} + +static void +gp_argb8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = pp[1]; + p->g = pp[2]; + p->b = pp[3]; + p->a = pp[0]; +} + +static void +gp_abgr8(Pixel *p, png_const_voidp pb) +{ + png_const_bytep pp = voidcast(png_const_bytep, pb); + + p->r = pp[3]; + p->g = pp[2]; + p->b = pp[1]; + p->a = pp[0]; +} + +static void +gp_g16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = p->g = p->b = pp[0]; + p->a = 65535; +} + +static void +gp_ga16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = p->g = p->b = pp[0]; + p->a = pp[1]; +} + +static void +gp_ag16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = p->g = p->b = pp[1]; + p->a = pp[0]; +} + +static void +gp_rgb16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = pp[0]; + p->g = pp[1]; + p->b = pp[2]; + p->a = 65535; +} + +static void +gp_bgr16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = pp[2]; + p->g = pp[1]; + p->b = pp[0]; + p->a = 65535; +} + +static void +gp_rgba16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = pp[0]; + p->g = pp[1]; + p->b = pp[2]; + p->a = pp[3]; +} + +static void +gp_bgra16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = pp[2]; + p->g = pp[1]; + p->b = pp[0]; + p->a = pp[3]; +} + +static void +gp_argb16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = pp[1]; + p->g = pp[2]; + p->b = pp[3]; + p->a = pp[0]; +} + +static void +gp_abgr16(Pixel *p, png_const_voidp pb) +{ + png_const_uint_16p pp = voidcast(png_const_uint_16p, pb); + + p->r = pp[3]; + p->g = pp[2]; + p->b = pp[1]; + p->a = pp[0]; +} + +/* Given a format, return the correct one of the above functions. */ +static void (* +get_pixel(png_uint_32 format))(Pixel *p, png_const_voidp pb) +{ + /* The color-map flag is irrelevant here - the caller of the function + * returned must either pass the buffer or, for a color-mapped image, the + * correct entry in the color-map. + */ + if (format & PNG_FORMAT_FLAG_LINEAR) + { + if (format & PNG_FORMAT_FLAG_COLOR) + { + if (format & PNG_FORMAT_FLAG_BGR) + { + if (format & PNG_FORMAT_FLAG_ALPHA) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + return gp_abgr16; + + else + return gp_bgra16; + } + + else + return gp_bgr16; + } + + else + { + if (format & PNG_FORMAT_FLAG_ALPHA) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + return gp_argb16; + + else + return gp_rgba16; + } + + else + return gp_rgb16; + } + } + + else + { + if (format & PNG_FORMAT_FLAG_ALPHA) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + return gp_ag16; + + else + return gp_ga16; + } + + else + return gp_g16; + } + } + + else + { + if (format & PNG_FORMAT_FLAG_COLOR) + { + if (format & PNG_FORMAT_FLAG_BGR) + { + if (format & PNG_FORMAT_FLAG_ALPHA) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + return gp_abgr8; + + else + return gp_bgra8; + } + + else + return gp_bgr8; + } + + else + { + if (format & PNG_FORMAT_FLAG_ALPHA) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + return gp_argb8; + + else + return gp_rgba8; + } + + else + return gp_rgb8; + } + } + + else + { + if (format & PNG_FORMAT_FLAG_ALPHA) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + return gp_ag8; + + else + return gp_ga8; + } + + else + return gp_g8; + } + } +} + +/* Convertion between pixel formats. The code above effectively eliminates the + * component ordering changes leaving three basic changes: + * + * 1) Remove an alpha channel by pre-multiplication or compositing on a + * background color. (Adding an alpha channel is a no-op.) + * + * 2) Remove color by mapping to grayscale. (Grayscale to color is a no-op.) + * + * 3) Convert between 8-bit and 16-bit components. (Both directtions are + * relevant.) + * + * This gives the following base format conversion matrix: + * + * OUT: ----- 8-bit ----- ----- 16-bit ----- + * IN G GA RGB RGBA G GA RGB RGBA + * 8 G . . . . lin lin lin lin + * 8 GA bckg . bckc . pre' pre pre' pre + * 8 RGB g8 g8 . . glin glin lin lin + * 8 RGBA g8b g8 bckc . gpr' gpre pre' pre + * 16 G sRGB sRGB sRGB sRGB . . . . + * 16 GA b16g unpg b16c unpc A . A . + * 16 RGB sG sG sRGB sRGB g16 g16 . . + * 16 RGBA gb16 sGp cb16 sCp g16 g16' A . + * + * 8-bit to 8-bit: + * bckg: composite on gray background + * bckc: composite on color background + * g8: convert sRGB components to sRGB grayscale + * g8b: convert sRGB components to grayscale and composite on gray background + * + * 8-bit to 16-bit: + * lin: make sRGB components linear, alpha := 65535 + * pre: make sRGB components linear and premultiply by alpha (scale alpha) + * pre': as 'pre' but alpha := 65535 + * glin: make sRGB components linear, convert to grayscale, alpha := 65535 + * gpre: make sRGB components grayscale and linear and premultiply by alpha + * gpr': as 'gpre' but alpha := 65535 + * + * 16-bit to 8-bit: + * sRGB: convert linear components to sRGB, alpha := 255 + * unpg: unpremultiply gray component and convert to sRGB (scale alpha) + * unpc: unpremultiply color components and convert to sRGB (scale alpha) + * b16g: composite linear onto gray background and convert the result to sRGB + * b16c: composite linear onto color background and convert the result to sRGB + * sG: convert linear RGB to sRGB grayscale + * sGp: unpremultiply RGB then convert to sRGB grayscale + * sCp: unpremultiply RGB then convert to sRGB + * gb16: composite linear onto background and convert to sRGB grayscale + * (order doesn't matter, the composite and grayscale operations permute) + * cb16: composite linear onto background and convert to sRGB + * + * 16-bit to 16-bit: + * A: set alpha to 65535 + * g16: convert linear RGB to linear grayscale (alpha := 65535) + * g16': as 'g16' but alpha is unchanged + */ +/* Simple copy: */ +static void +gpc_noop(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + out->r = in->r; + out->g = in->g; + out->b = in->b; + out->a = in->a; +} + +#if ALLOW_UNUSED_GPC +static void +gpc_nop8(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + if (in->a == 0) + out->r = out->g = out->b = 255; + + else + { + out->r = in->r; + out->g = in->g; + out->b = in->b; + } + + out->a = in->a; +} +#endif + +#if ALLOW_UNUSED_GPC +static void +gpc_nop6(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + if (in->a == 0) + out->r = out->g = out->b = 65535; + + else + { + out->r = in->r; + out->g = in->g; + out->b = in->b; + } + + out->a = in->a; +} +#endif + +/* 8-bit to 8-bit conversions */ +/* bckg: composite on gray background */ +static void +gpc_bckg(Pixel *out, const Pixel *in, const Background *back) +{ + if (in->a <= 0) + out->r = out->g = out->b = back->ig; + + else if (in->a >= 255) + out->r = out->g = out->b = in->g; + + else + { + double a = in->a / 255.; + + out->r = out->g = out->b = sRGB(sRGB_to_d[in->g] * a + back->dg * (1-a)); + } + + out->a = 255; +} + +/* bckc: composite on color background */ +static void +gpc_bckc(Pixel *out, const Pixel *in, const Background *back) +{ + if (in->a <= 0) + { + out->r = back->ir; + out->g = back->ig; + out->b = back->ib; + } + + else if (in->a >= 255) + { + out->r = in->r; + out->g = in->g; + out->b = in->b; + } + + else + { + double a = in->a / 255.; + + out->r = sRGB(sRGB_to_d[in->r] * a + back->dr * (1-a)); + out->g = sRGB(sRGB_to_d[in->g] * a + back->dg * (1-a)); + out->b = sRGB(sRGB_to_d[in->b] * a + back->db * (1-a)); + } + + out->a = 255; +} + +/* g8: convert sRGB components to sRGB grayscale */ +static void +gpc_g8(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->r == in->g && in->g == in->b) + out->r = out->g = out->b = in->g; + + else + out->r = out->g = out->b = + sRGB(YfromRGB(sRGB_to_d[in->r], sRGB_to_d[in->g], sRGB_to_d[in->b])); + + out->a = in->a; +} + +/* g8b: convert sRGB components to grayscale and composite on gray background */ +static void +gpc_g8b(Pixel *out, const Pixel *in, const Background *back) +{ + if (in->a <= 0) + out->r = out->g = out->b = back->ig; + + else if (in->a >= 255) + { + if (in->r == in->g && in->g == in->b) + out->r = out->g = out->b = in->g; + + else + out->r = out->g = out->b = sRGB(YfromRGB( + sRGB_to_d[in->r], sRGB_to_d[in->g], sRGB_to_d[in->b])); + } + + else + { + double a = in->a/255.; + + out->r = out->g = out->b = sRGB(a * YfromRGB(sRGB_to_d[in->r], + sRGB_to_d[in->g], sRGB_to_d[in->b]) + back->dg * (1-a)); + } + + out->a = 255; +} + +/* 8-bit to 16-bit conversions */ +/* lin: make sRGB components linear, alpha := 65535 */ +static void +gpc_lin(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + out->r = ilinear(in->r); + + if (in->g == in->r) + { + out->g = out->r; + + if (in->b == in->r) + out->b = out->r; + + else + out->b = ilinear(in->b); + } + + else + { + out->g = ilinear(in->g); + + if (in->b == in->r) + out->b = out->r; + + else if (in->b == in->g) + out->b = out->g; + + else + out->b = ilinear(in->b); + } + + out->a = 65535; +} + +/* pre: make sRGB components linear and premultiply by alpha (scale alpha) */ +static void +gpc_pre(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + out->r = ilineara(in->r, in->a); + + if (in->g == in->r) + { + out->g = out->r; + + if (in->b == in->r) + out->b = out->r; + + else + out->b = ilineara(in->b, in->a); + } + + else + { + out->g = ilineara(in->g, in->a); + + if (in->b == in->r) + out->b = out->r; + + else if (in->b == in->g) + out->b = out->g; + + else + out->b = ilineara(in->b, in->a); + } + + out->a = in->a * 257; +} + +/* pre': as 'pre' but alpha := 65535 */ +static void +gpc_preq(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + out->r = ilineara(in->r, in->a); + + if (in->g == in->r) + { + out->g = out->r; + + if (in->b == in->r) + out->b = out->r; + + else + out->b = ilineara(in->b, in->a); + } + + else + { + out->g = ilineara(in->g, in->a); + + if (in->b == in->r) + out->b = out->r; + + else if (in->b == in->g) + out->b = out->g; + + else + out->b = ilineara(in->b, in->a); + } + + out->a = 65535; +} + +/* glin: make sRGB components linear, convert to grayscale, alpha := 65535 */ +static void +gpc_glin(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->r == in->g && in->g == in->b) + out->r = out->g = out->b = ilinear(in->g); + + else + out->r = out->g = out->b = u16d(65535 * + YfromRGB(sRGB_to_d[in->r], sRGB_to_d[in->g], sRGB_to_d[in->b])); + + out->a = 65535; +} + +/* gpre: make sRGB components grayscale and linear and premultiply by alpha */ +static void +gpc_gpre(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->r == in->g && in->g == in->b) + out->r = out->g = out->b = ilineara(in->g, in->a); + + else + out->r = out->g = out->b = u16d(in->a * 257 * + YfromRGB(sRGB_to_d[in->r], sRGB_to_d[in->g], sRGB_to_d[in->b])); + + out->a = 257 * in->a; +} + +/* gpr': as 'gpre' but alpha := 65535 */ +static void +gpc_gprq(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->r == in->g && in->g == in->b) + out->r = out->g = out->b = ilineara(in->g, in->a); + + else + out->r = out->g = out->b = u16d(in->a * 257 * + YfromRGB(sRGB_to_d[in->r], sRGB_to_d[in->g], sRGB_to_d[in->b])); + + out->a = 65535; +} + +/* 8-bit to 16-bit conversions for gAMA 45455 encoded values */ +/* Lin: make gAMA 45455 components linear, alpha := 65535 */ +static void +gpc_Lin(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + out->r = ilinear_g22(in->r); + + if (in->g == in->r) + { + out->g = out->r; + + if (in->b == in->r) + out->b = out->r; + + else + out->b = ilinear_g22(in->b); + } + + else + { + out->g = ilinear_g22(in->g); + + if (in->b == in->r) + out->b = out->r; + + else if (in->b == in->g) + out->b = out->g; + + else + out->b = ilinear_g22(in->b); + } + + out->a = 65535; +} + +#if ALLOW_UNUSED_GPC +/* Pre: make gAMA 45455 components linear and premultiply by alpha (scale alpha) + */ +static void +gpc_Pre(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + out->r = ilineara_g22(in->r, in->a); + + if (in->g == in->r) + { + out->g = out->r; + + if (in->b == in->r) + out->b = out->r; + + else + out->b = ilineara_g22(in->b, in->a); + } + + else + { + out->g = ilineara_g22(in->g, in->a); + + if (in->b == in->r) + out->b = out->r; + + else if (in->b == in->g) + out->b = out->g; + + else + out->b = ilineara_g22(in->b, in->a); + } + + out->a = in->a * 257; +} +#endif + +#if ALLOW_UNUSED_GPC +/* Pre': as 'Pre' but alpha := 65535 */ +static void +gpc_Preq(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + out->r = ilineara_g22(in->r, in->a); + + if (in->g == in->r) + { + out->g = out->r; + + if (in->b == in->r) + out->b = out->r; + + else + out->b = ilineara_g22(in->b, in->a); + } + + else + { + out->g = ilineara_g22(in->g, in->a); + + if (in->b == in->r) + out->b = out->r; + + else if (in->b == in->g) + out->b = out->g; + + else + out->b = ilineara_g22(in->b, in->a); + } + + out->a = 65535; +} +#endif + +#if ALLOW_UNUSED_GPC +/* Glin: make gAMA 45455 components linear, convert to grayscale, alpha := 65535 + */ +static void +gpc_Glin(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->r == in->g && in->g == in->b) + out->r = out->g = out->b = ilinear_g22(in->g); + + else + out->r = out->g = out->b = u16d(65535 * + YfromRGB(g22_to_d[in->r], g22_to_d[in->g], g22_to_d[in->b])); + + out->a = 65535; +} +#endif + +#if ALLOW_UNUSED_GPC +/* Gpre: make gAMA 45455 components grayscale and linear and premultiply by + * alpha. + */ +static void +gpc_Gpre(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->r == in->g && in->g == in->b) + out->r = out->g = out->b = ilineara_g22(in->g, in->a); + + else + out->r = out->g = out->b = u16d(in->a * 257 * + YfromRGB(g22_to_d[in->r], g22_to_d[in->g], g22_to_d[in->b])); + + out->a = 257 * in->a; +} +#endif + +#if ALLOW_UNUSED_GPC +/* Gpr': as 'Gpre' but alpha := 65535 */ +static void +gpc_Gprq(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->r == in->g && in->g == in->b) + out->r = out->g = out->b = ilineara_g22(in->g, in->a); + + else + out->r = out->g = out->b = u16d(in->a * 257 * + YfromRGB(g22_to_d[in->r], g22_to_d[in->g], g22_to_d[in->b])); + + out->a = 65535; +} +#endif + +/* 16-bit to 8-bit conversions */ +/* sRGB: convert linear components to sRGB, alpha := 255 */ +static void +gpc_sRGB(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + out->r = isRGB(in->r); + + if (in->g == in->r) + { + out->g = out->r; + + if (in->b == in->r) + out->b = out->r; + + else + out->b = isRGB(in->b); + } + + else + { + out->g = isRGB(in->g); + + if (in->b == in->r) + out->b = out->r; + + else if (in->b == in->g) + out->b = out->g; + + else + out->b = isRGB(in->b); + } + + out->a = 255; +} + +/* unpg: unpremultiply gray component and convert to sRGB (scale alpha) */ +static void +gpc_unpg(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->a <= 128) + { + out->r = out->g = out->b = 255; + out->a = 0; + } + + else + { + out->r = out->g = out->b = sRGB((double)in->g / in->a); + out->a = u8d(in->a / 257.); + } +} + +/* unpc: unpremultiply color components and convert to sRGB (scale alpha) */ +static void +gpc_unpc(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->a <= 128) + { + out->r = out->g = out->b = 255; + out->a = 0; + } + + else + { + out->r = sRGB((double)in->r / in->a); + out->g = sRGB((double)in->g / in->a); + out->b = sRGB((double)in->b / in->a); + out->a = u8d(in->a / 257.); + } +} + +/* b16g: composite linear onto gray background and convert the result to sRGB */ +static void +gpc_b16g(Pixel *out, const Pixel *in, const Background *back) +{ + if (in->a <= 0) + out->r = out->g = out->b = back->ig; + + else + { + double a = in->a/65535.; + double a1 = 1-a; + + a /= 65535; + out->r = out->g = out->b = sRGB(in->g * a + back->dg * a1); + } + + out->a = 255; +} + +/* b16c: composite linear onto color background and convert the result to sRGB*/ +static void +gpc_b16c(Pixel *out, const Pixel *in, const Background *back) +{ + if (in->a <= 0) + { + out->r = back->ir; + out->g = back->ig; + out->b = back->ib; + } + + else + { + double a = in->a/65535.; + double a1 = 1-a; + + a /= 65535; + out->r = sRGB(in->r * a + back->dr * a1); + out->g = sRGB(in->g * a + back->dg * a1); + out->b = sRGB(in->b * a + back->db * a1); + } + + out->a = 255; +} + +/* sG: convert linear RGB to sRGB grayscale */ +static void +gpc_sG(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + out->r = out->g = out->b = sRGB(YfromRGBint(in->r, in->g, in->b)/65535); + out->a = 255; +} + +/* sGp: unpremultiply RGB then convert to sRGB grayscale */ +static void +gpc_sGp(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->a <= 128) + { + out->r = out->g = out->b = 255; + out->a = 0; + } + + else + { + out->r = out->g = out->b = sRGB(YfromRGBint(in->r, in->g, in->b)/in->a); + out->a = u8d(in->a / 257.); + } +} + +/* sCp: unpremultiply RGB then convert to sRGB */ +static void +gpc_sCp(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + + if (in->a <= 128) + { + out->r = out->g = out->b = 255; + out->a = 0; + } + + else + { + out->r = sRGB((double)in->r / in->a); + out->g = sRGB((double)in->g / in->a); + out->b = sRGB((double)in->b / in->a); + out->a = u8d(in->a / 257.); + } +} + +/* gb16: composite linear onto background and convert to sRGB grayscale */ +/* (order doesn't matter, the composite and grayscale operations permute) */ +static void +gpc_gb16(Pixel *out, const Pixel *in, const Background *back) +{ + if (in->a <= 0) + out->r = out->g = out->b = back->ig; + + else if (in->a >= 65535) + out->r = out->g = out->b = isRGB(in->g); + + else + { + double a = in->a / 65535.; + double a1 = 1-a; + + a /= 65535; + out->r = out->g = out->b = sRGB(in->g * a + back->dg * a1); + } + + out->a = 255; +} + +/* cb16: composite linear onto background and convert to sRGB */ +static void +gpc_cb16(Pixel *out, const Pixel *in, const Background *back) +{ + if (in->a <= 0) + { + out->r = back->ir; + out->g = back->ig; + out->b = back->ib; + } + + else if (in->a >= 65535) + { + out->r = isRGB(in->r); + out->g = isRGB(in->g); + out->b = isRGB(in->b); + } + + else + { + double a = in->a / 65535.; + double a1 = 1-a; + + a /= 65535; + out->r = sRGB(in->r * a + back->dr * a1); + out->g = sRGB(in->g * a + back->dg * a1); + out->b = sRGB(in->b * a + back->db * a1); + } + + out->a = 255; +} + +/* 16-bit to 16-bit conversions */ +/* A: set alpha to 65535 */ +static void +gpc_A(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + out->r = in->r; + out->g = in->g; + out->b = in->b; + out->a = 65535; +} + +/* g16: convert linear RGB to linear grayscale (alpha := 65535) */ +static void +gpc_g16(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + out->r = out->g = out->b = u16d(YfromRGBint(in->r, in->g, in->b)); + out->a = 65535; +} + +/* g16': as 'g16' but alpha is unchanged */ +static void +gpc_g16q(Pixel *out, const Pixel *in, const Background *back) +{ + (void)back; + out->r = out->g = out->b = u16d(YfromRGBint(in->r, in->g, in->b)); + out->a = in->a; +} + +#if ALLOW_UNUSED_GPC +/* Unused functions (to hide them from GCC unused function warnings) */ +void (* const gpc_unused[]) + (Pixel *out, const Pixel *in, const Background *back) = +{ + gpc_Pre, gpc_Preq, gpc_Glin, gpc_Gpre, gpc_Gprq, gpc_nop8, gpc_nop6 +}; +#endif + +/* OUT: ----- 8-bit ----- ----- 16-bit ----- + * IN G GA RGB RGBA G GA RGB RGBA + * 8 G . . . . lin lin lin lin + * 8 GA bckg . bckc . pre' pre pre' pre + * 8 RGB g8 g8 . . glin glin lin lin + * 8 RGBA g8b g8 bckc . gpr' gpre pre' pre + * 16 G sRGB sRGB sRGB sRGB . . . . + * 16 GA b16g unpg b16c unpc A . A . + * 16 RGB sG sG sRGB sRGB g16 g16 . . + * 16 RGBA gb16 sGp cb16 sCp g16 g16' A . + * + * The matrix is held in an array indexed thus: + * + * gpc_fn[out_format & BASE_FORMATS][in_format & BASE_FORMATS]; + */ +/* This will produce a compile time error if the FORMAT_FLAG values don't + * match the above matrix! + */ +#if PNG_FORMAT_FLAG_ALPHA == 1 && PNG_FORMAT_FLAG_COLOR == 2 &&\ + PNG_FORMAT_FLAG_LINEAR == 4 +static void (* const gpc_fn[8/*in*/][8/*out*/]) + (Pixel *out, const Pixel *in, const Background *back) = +{ +/*out: G-8 GA-8 RGB-8 RGBA-8 G-16 GA-16 RGB-16 RGBA-16 */ + {gpc_noop,gpc_noop,gpc_noop,gpc_noop, gpc_Lin, gpc_Lin, gpc_Lin, gpc_Lin }, + {gpc_bckg,gpc_noop,gpc_bckc,gpc_noop, gpc_preq,gpc_pre, gpc_preq,gpc_pre }, + {gpc_g8, gpc_g8, gpc_noop,gpc_noop, gpc_glin,gpc_glin,gpc_lin, gpc_lin }, + {gpc_g8b, gpc_g8, gpc_bckc,gpc_noop, gpc_gprq,gpc_gpre,gpc_preq,gpc_pre }, + {gpc_sRGB,gpc_sRGB,gpc_sRGB,gpc_sRGB, gpc_noop,gpc_noop,gpc_noop,gpc_noop}, + {gpc_b16g,gpc_unpg,gpc_b16c,gpc_unpc, gpc_A, gpc_noop,gpc_A, gpc_noop}, + {gpc_sG, gpc_sG, gpc_sRGB,gpc_sRGB, gpc_g16, gpc_g16, gpc_noop,gpc_noop}, + {gpc_gb16,gpc_sGp, gpc_cb16,gpc_sCp, gpc_g16, gpc_g16q,gpc_A, gpc_noop} +}; + +/* The array is repeated for the cases where both the input and output are color + * mapped because then different algorithms are used. + */ +static void (* const gpc_fn_colormapped[8/*in*/][8/*out*/]) + (Pixel *out, const Pixel *in, const Background *back) = +{ +/*out: G-8 GA-8 RGB-8 RGBA-8 G-16 GA-16 RGB-16 RGBA-16 */ + {gpc_noop,gpc_noop,gpc_noop,gpc_noop, gpc_lin, gpc_lin, gpc_lin, gpc_lin }, + {gpc_bckg,gpc_noop,gpc_bckc,gpc_noop, gpc_preq,gpc_pre, gpc_preq,gpc_pre }, + {gpc_g8, gpc_g8, gpc_noop,gpc_noop, gpc_glin,gpc_glin,gpc_lin, gpc_lin }, + {gpc_g8b, gpc_g8, gpc_bckc,gpc_noop, gpc_gprq,gpc_gpre,gpc_preq,gpc_pre }, + {gpc_sRGB,gpc_sRGB,gpc_sRGB,gpc_sRGB, gpc_noop,gpc_noop,gpc_noop,gpc_noop}, + {gpc_b16g,gpc_unpg,gpc_b16c,gpc_unpc, gpc_A, gpc_noop,gpc_A, gpc_noop}, + {gpc_sG, gpc_sG, gpc_sRGB,gpc_sRGB, gpc_g16, gpc_g16, gpc_noop,gpc_noop}, + {gpc_gb16,gpc_sGp, gpc_cb16,gpc_sCp, gpc_g16, gpc_g16q,gpc_A, gpc_noop} +}; + +/* The error arrays record the error in the same matrix; 64 entries, however + * the different algorithms used in libpng for colormap and direct conversions + * mean that four separate matrices are used (for each combination of + * colormapped and direct.) + * + * In some cases the conversion between sRGB formats goes via a linear + * intermediate; an sRGB to linear conversion (as above) is followed by a simple + * linear to sRGB step with no other conversions. This is done by a separate + * error array from an arbitrary 'in' format to one of the four basic outputs + * (since final output is always sRGB not colormapped). + * + * These arrays may be modified if the --accumulate flag is set during the run; + * then instead of logging errors they are simply added in. + * + * The three entries are currently for transparent, partially transparent and + * opaque input pixel values. Notice that alpha should be exact in each case. + * + * Errors in alpha should only occur when converting from a direct format + * to a colormapped format, when alpha is effectively smashed (so large + * errors can occur.) There should be no error in the '0' and 'opaque' + * values. The fourth entry in the array is used for the alpha error (and it + * should always be zero for the 'via linear' case since this is never color + * mapped.) + * + * Mapping to a colormap smashes the colors, it is necessary to have separate + * values for these cases because they are much larger; it is very much + * impossible to obtain a reasonable result, these are held in + * gpc_error_to_colormap. + */ +#if PNG_FORMAT_FLAG_COLORMAP == 8 /* extra check also required */ +/* START MACHINE GENERATED */ +static png_uint_16 gpc_error[16/*in*/][16/*out*/][4/*a*/] = +{ + { /* input: sRGB-gray */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 372, 0 }, { 0, 0, 372, 0 }, { 0, 0, 372, 0 }, { 0, 0, 372, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: sRGB-gray+alpha */ + { 0, 18, 0, 0 }, { 0, 0, 0, 0 }, { 0, 20, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 897, 788, 0 }, { 0, 897, 788, 0 }, { 0, 897, 788, 0 }, { 0, 897, 788, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: sRGB-rgb */ + { 0, 0, 19, 0 }, { 0, 0, 19, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 893, 0 }, { 0, 0, 893, 0 }, { 0, 0, 811, 0 }, { 0, 0, 811, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: sRGB-rgb+alpha */ + { 0, 4, 13, 0 }, { 0, 14, 13, 0 }, { 0, 19, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 832, 764, 0 }, { 0, 832, 764, 0 }, { 0, 897, 788, 0 }, { 0, 897, 788, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: linear-gray */ + { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: linear-gray+alpha */ + { 0, 74, 9, 0 }, { 0, 20, 9, 0 }, { 0, 74, 9, 0 }, { 0, 20, 9, 0 }, + { 0, 0, 0, 0 }, { 0, 1, 0, 0 }, { 0, 0, 0, 0 }, { 0, 1, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: linear-rgb */ + { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, + { 0, 0, 4, 0 }, { 0, 0, 4, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: linear-rgb+alpha */ + { 0, 126, 143, 0 }, { 0, 9, 7, 0 }, { 0, 74, 9, 0 }, { 0, 16, 9, 0 }, + { 0, 4, 4, 0 }, { 0, 5, 4, 0 }, { 0, 0, 0, 0 }, { 0, 1, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-sRGB-gray */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-sRGB-gray+alpha */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-sRGB-rgb */ + { 0, 0, 13, 0 }, { 0, 0, 13, 0 }, { 0, 0, 8, 0 }, { 0, 0, 8, 0 }, + { 0, 0, 673, 0 }, { 0, 0, 673, 0 }, { 0, 0, 674, 0 }, { 0, 0, 674, 0 }, + { 0, 0, 1, 0 }, { 0, 0, 1, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 460, 0 }, { 0, 0, 460, 0 }, { 0, 0, 263, 0 }, { 0, 0, 263, 0 } + }, { /* input: color-mapped-sRGB-rgb+alpha */ + { 0, 6, 8, 0 }, { 0, 7, 8, 0 }, { 0, 75, 8, 0 }, { 0, 9, 8, 0 }, + { 0, 585, 427, 0 }, { 0, 585, 427, 0 }, { 0, 717, 409, 0 }, { 0, 717, 409, 0 }, + { 0, 1, 1, 0 }, { 0, 1, 1, 0 }, { 0, 1, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 13323, 460, 0 }, { 0, 334, 460, 0 }, { 0, 16480, 263, 0 }, { 0, 243, 263, 0 } + }, { /* input: color-mapped-linear-gray */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 282, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-linear-gray+alpha */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 253, 282, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-linear-rgb */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 265, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-linear-rgb+alpha */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 243, 265, 0 } + } +}; +static png_uint_16 gpc_error_via_linear[16][4/*out*/][4] = +{ + { /* input: sRGB-gray */ + { 0, 0, 7, 0 }, { 0, 0, 7, 0 }, { 0, 0, 7, 0 }, { 0, 0, 7, 0 } + }, { /* input: sRGB-gray+alpha */ + { 0, 15, 15, 0 }, { 0, 186, 15, 0 }, { 0, 15, 15, 0 }, { 0, 186, 15, 0 } + }, { /* input: sRGB-rgb */ + { 0, 0, 19, 0 }, { 0, 0, 19, 0 }, { 0, 0, 15, 0 }, { 0, 0, 15, 0 } + }, { /* input: sRGB-rgb+alpha */ + { 0, 12, 14, 0 }, { 0, 180, 14, 0 }, { 0, 14, 15, 0 }, { 0, 186, 15, 0 } + }, { /* input: linear-gray */ + { 0, 0, 1, 0 }, { 0, 0, 1, 0 }, { 0, 0, 1, 0 }, { 0, 0, 1, 0 } + }, { /* input: linear-gray+alpha */ + { 0, 1, 1, 0 }, { 0, 1, 1, 0 }, { 0, 1, 1, 0 }, { 0, 1, 1, 0 } + }, { /* input: linear-rgb */ + { 0, 0, 1, 0 }, { 0, 0, 1, 0 }, { 0, 0, 1, 0 }, { 0, 0, 1, 0 } + }, { /* input: linear-rgb+alpha */ + { 0, 1, 1, 0 }, { 0, 8, 1, 0 }, { 0, 1, 1, 0 }, { 0, 1, 1, 0 } + }, { /* input: color-mapped-sRGB-gray */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-sRGB-gray+alpha */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-sRGB-rgb */ + { 0, 0, 13, 0 }, { 0, 0, 13, 0 }, { 0, 0, 14, 0 }, { 0, 0, 14, 0 } + }, { /* input: color-mapped-sRGB-rgb+alpha */ + { 0, 4, 8, 0 }, { 0, 9, 8, 0 }, { 0, 8, 3, 0 }, { 0, 32, 3, 0 } + }, { /* input: color-mapped-linear-gray */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-linear-gray+alpha */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-linear-rgb */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + }, { /* input: color-mapped-linear-rgb+alpha */ + { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 }, { 0, 0, 0, 0 } + } +}; +static png_uint_16 gpc_error_to_colormap[8/*i*/][8/*o*/][4] = +{ + { /* input: sRGB-gray */ + { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, { 0, 0, 9, 0 }, + { 0, 0, 560, 0 }, { 0, 0, 560, 0 }, { 0, 0, 560, 0 }, { 0, 0, 560, 0 } + }, { /* input: sRGB-gray+alpha */ + { 0, 19, 2, 0 }, { 0, 255, 2, 25 }, { 0, 88, 2, 0 }, { 0, 255, 2, 25 }, + { 0, 1012, 745, 0 }, { 0, 16026, 745, 6425 }, { 0, 1012, 745, 0 }, { 0, 16026, 745, 6425 } + }, { /* input: sRGB-rgb */ + { 0, 0, 19, 0 }, { 0, 0, 19, 0 }, { 0, 0, 25, 0 }, { 0, 0, 25, 0 }, + { 0, 0, 937, 0 }, { 0, 0, 937, 0 }, { 0, 0, 13677, 0 }, { 0, 0, 13677, 0 } + }, { /* input: sRGB-rgb+alpha */ + { 0, 63, 77, 0 }, { 0, 255, 19, 25 }, { 0, 220, 25, 0 }, { 0, 255, 25, 67 }, + { 0, 17534, 18491, 0 }, { 0, 15614, 2824, 6425 }, { 0, 14019, 13677, 0 }, { 0, 48573, 13677, 17219 } + }, { /* input: linear-gray */ + { 0, 0, 73, 0 }, { 0, 0, 73, 0 }, { 0, 0, 73, 0 }, { 0, 0, 73, 0 }, + { 0, 0, 18817, 0 }, { 0, 0, 18817, 0 }, { 0, 0, 18817, 0 }, { 0, 0, 18817, 0 } + }, { /* input: linear-gray+alpha */ + { 0, 74, 74, 0 }, { 0, 255, 74, 25 }, { 0, 97, 74, 0 }, { 0, 255, 74, 25 }, + { 0, 18919, 18907, 0 }, { 0, 24549, 18907, 6552 }, { 0, 18919, 18907, 0 }, { 0, 24549, 18907, 6552 } + }, { /* input: linear-rgb */ + { 0, 0, 73, 0 }, { 0, 0, 73, 0 }, { 0, 0, 98, 0 }, { 0, 0, 98, 0 }, + { 0, 0, 18664, 0 }, { 0, 0, 18664, 0 }, { 0, 0, 24998, 0 }, { 0, 0, 24998, 0 } + }, { /* input: linear-rgb+alpha */ + { 0, 181, 196, 0 }, { 0, 255, 61, 25 }, { 206, 187, 98, 0 }, { 0, 255, 98, 67 }, + { 0, 18141, 18137, 0 }, { 0, 17494, 17504, 6553 }, { 0, 24979, 24992, 0 }, { 0, 46509, 24992, 17347 } + } +}; +/* END MACHINE GENERATED */ +#endif /* COLORMAP flag check */ +#endif /* flag checks */ + +typedef struct +{ + /* Basic pixel information: */ + Image* in_image; /* Input image */ + const Image* out_image; /* Output image */ + + /* 'background' is the value passed to the gpc_ routines, it may be NULL if + * it should not be used (*this* program has an error if it crashes as a + * result!) + */ + Background background_color; + const Background* background; + + /* Precalculated values: */ + int in_opaque; /* Value of input alpha that is opaque */ + int is_palette; /* Sample values come from the palette */ + int accumulate; /* Accumlate component errors (don't log) */ + int output_8bit; /* Output is 8 bit (else 16 bit) */ + + void (*in_gp)(Pixel*, png_const_voidp); + void (*out_gp)(Pixel*, png_const_voidp); + + void (*transform)(Pixel *out, const Pixel *in, const Background *back); + /* A function to perform the required transform */ + + void (*from_linear)(Pixel *out, const Pixel *in, const Background *back); + /* For 'via_linear' transforms the final, from linear, step, else NULL */ + + png_uint_16 error[4]; + /* Three error values for transparent, partially transparent and opaque + * input pixels (in turn). + */ + + png_uint_16 *error_ptr; + /* Where these are stored in the static array (for 'accumulate') */ +} +Transform; + +/* Return a 'transform' as above for the given format conversion. */ +static void +transform_from_formats(Transform *result, Image *in_image, + const Image *out_image, png_const_colorp background, int via_linear) +{ + png_uint_32 in_format, out_format; + png_uint_32 in_base, out_base; + + memset(result, 0, sizeof *result); + + /* Store the original images for error messages */ + result->in_image = in_image; + result->out_image = out_image; + + in_format = in_image->image.format; + out_format = out_image->image.format; + + if (in_format & PNG_FORMAT_FLAG_LINEAR) + result->in_opaque = 65535; + else + result->in_opaque = 255; + + result->output_8bit = (out_format & PNG_FORMAT_FLAG_LINEAR) == 0; + + result->is_palette = 0; /* set by caller if required */ + result->accumulate = (in_image->opts & ACCUMULATE) != 0; + + /* The loaders (which need the ordering information) */ + result->in_gp = get_pixel(in_format); + result->out_gp = get_pixel(out_format); + + /* Remove the ordering information: */ + in_format &= BASE_FORMATS | PNG_FORMAT_FLAG_COLORMAP; + in_base = in_format & BASE_FORMATS; + out_format &= BASE_FORMATS | PNG_FORMAT_FLAG_COLORMAP; + out_base = out_format & BASE_FORMATS; + + if (via_linear) + { + /* Check for an error in this program: */ + if (out_format & (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLORMAP)) + { + fprintf(stderr, "internal transform via linear error 0x%x->0x%x\n", + in_format, out_format); + exit(1); + } + + result->transform = gpc_fn[in_base][out_base | PNG_FORMAT_FLAG_LINEAR]; + result->from_linear = gpc_fn[out_base | PNG_FORMAT_FLAG_LINEAR][out_base]; + result->error_ptr = gpc_error_via_linear[in_format][out_format]; + } + + else if (~in_format & out_format & PNG_FORMAT_FLAG_COLORMAP) + { + /* The input is not colormapped but the output is, the errors will + * typically be large (only the grayscale-no-alpha case permits preserving + * even 8-bit values.) + */ + result->transform = gpc_fn[in_base][out_base]; + result->from_linear = NULL; + result->error_ptr = gpc_error_to_colormap[in_base][out_base]; + } + + else + { + /* The caller handles the colormap->pixel value conversion, so the + * transform function just gets a pixel value, however because libpng + * currently contains a different implementation for mapping a colormap if + * both input and output are colormapped we need different conversion + * functions to deal with errors in the libpng implementation. + */ + if (in_format & out_format & PNG_FORMAT_FLAG_COLORMAP) + result->transform = gpc_fn_colormapped[in_base][out_base]; + else + result->transform = gpc_fn[in_base][out_base]; + result->from_linear = NULL; + result->error_ptr = gpc_error[in_format][out_format]; + } + + /* Follow the libpng simplified API rules to work out what to pass to the gpc + * routines as a background value, if one is not required pass NULL so that + * this program crashes in the even of a programming error. + */ + result->background = NULL; /* default: not required */ + + /* Rule 1: background only need be supplied if alpha is to be removed */ + if (in_format & ~out_format & PNG_FORMAT_FLAG_ALPHA) + { + /* The input value is 'NULL' to use the background and (otherwise) an sRGB + * background color (to use a solid color). The code above uses a fixed + * byte value, BUFFER_INIT8, for buffer even for 16-bit output. For + * linear (16-bit) output the sRGB background color is ignored; the + * composition is always on the background (so BUFFER_INIT8 * 257), except + * that for the colormap (i.e. linear colormapped output) black is used. + */ + result->background = &result->background_color; + + if (out_format & PNG_FORMAT_FLAG_LINEAR || via_linear) + { + if (out_format & PNG_FORMAT_FLAG_COLORMAP) + { + result->background_color.ir = + result->background_color.ig = + result->background_color.ib = 0; + result->background_color.dr = + result->background_color.dg = + result->background_color.db = 0; + } + + else + { + result->background_color.ir = + result->background_color.ig = + result->background_color.ib = BUFFER_INIT8 * 257; + result->background_color.dr = + result->background_color.dg = + result->background_color.db = 0; + } + } + + else /* sRGB output */ + { + if (background != NULL) + { + if (out_format & PNG_FORMAT_FLAG_COLOR) + { + result->background_color.ir = background->red; + result->background_color.ig = background->green; + result->background_color.ib = background->blue; + /* TODO: sometimes libpng uses the power law conversion here, how + * to handle this? + */ + result->background_color.dr = sRGB_to_d[background->red]; + result->background_color.dg = sRGB_to_d[background->green]; + result->background_color.db = sRGB_to_d[background->blue]; + } + + else /* grayscale: libpng only looks at 'g' */ + { + result->background_color.ir = + result->background_color.ig = + result->background_color.ib = background->green; + /* TODO: sometimes libpng uses the power law conversion here, how + * to handle this? + */ + result->background_color.dr = + result->background_color.dg = + result->background_color.db = sRGB_to_d[background->green]; + } + } + + else if ((out_format & PNG_FORMAT_FLAG_COLORMAP) == 0) + { + result->background_color.ir = + result->background_color.ig = + result->background_color.ib = BUFFER_INIT8; + /* TODO: sometimes libpng uses the power law conversion here, how + * to handle this? + */ + result->background_color.dr = + result->background_color.dg = + result->background_color.db = sRGB_to_d[BUFFER_INIT8]; + } + + /* Else the output is colormapped and a background color must be + * provided; if pngstest crashes then that is a bug in this program + * (though libpng should png_error as well.) + */ + else + result->background = NULL; + } + } + + if (result->background == NULL) + { + result->background_color.ir = + result->background_color.ig = + result->background_color.ib = -1; /* not used */ + result->background_color.dr = + result->background_color.dg = + result->background_color.db = 1E30; /* not used */ + } + + + /* Copy the error values into the Transform: */ + result->error[0] = result->error_ptr[0]; + result->error[1] = result->error_ptr[1]; + result->error[2] = result->error_ptr[2]; + result->error[3] = result->error_ptr[3]; +} + + +/* Compare two pixels. + * + * OLD error values: +static int error_to_linear = 811; * by experiment * +static int error_to_linear_grayscale = 424; * by experiment * +static int error_to_sRGB = 6; * by experiment * +static int error_to_sRGB_grayscale = 17; * libpng error by calculation + + 2 by experiment * +static int error_in_compose = 2; * by experiment * +static int error_in_premultiply = 1; + * + * The following is *just* the result of a round trip from 8-bit sRGB to linear + * then back to 8-bit sRGB when it is done by libpng. There are two problems: + * + * 1) libpng currently uses a 2.2 power law with no linear segment, this results + * in instability in the low values and even with 16-bit precision sRGB(1) ends + * up mapping to sRGB(0) as a result of rounding in the 16-bit representation. + * This gives an error of 1 in the handling of value 1 only. + * + * 2) libpng currently uses an intermediate 8-bit linear value in gamma + * correction of 8-bit values. This results in many more errors, the worse of + * which is mapping sRGB(14) to sRGB(0). + * + * The general 'error_via_linear' is more complex because of pre-multiplication, + * this compounds the 8-bit errors according to the alpha value of the pixel. + * As a result 256 values are pre-calculated for error_via_linear. + */ +#if 0 +static int error_in_libpng_gamma; +static int error_via_linear[256]; /* Indexed by 8-bit alpha */ + +static void +init_error_via_linear(void) +{ + int alpha; + + error_via_linear[0] = 255; /* transparent pixel */ + + for (alpha=1; alpha<=255; ++alpha) + { + /* 16-bit values less than 128.5 get rounded to 8-bit 0 and so the worst + * case error arises with 16-bit 128.5, work out what sRGB + * (non-associated) value generates 128.5; any value less than this is + * going to map to 0, so the worst error is floor(value). + * + * Note that errors are considerably higher (more than a factor of 2) + * because libpng uses a simple power law for sRGB data at present. + * + * Add .1 for arithmetic errors inside libpng. + */ + double v = floor(255*pow(.5/*(128.5 * 255 / 65535)*/ / alpha, 1/2.2)+.1); + + error_via_linear[alpha] = (int)v; + } + + /* This is actually 14.99, but, despite the closeness to 15, 14 seems to work + * ok in this case. + */ + error_in_libpng_gamma = 14; +} +#endif + +static void +print_pixel(char string[64], const Pixel *pixel, png_uint_32 format) +{ + switch (format & (PNG_FORMAT_FLAG_ALPHA|PNG_FORMAT_FLAG_COLOR)) + { + case 0: + sprintf(string, "%s(%d)", format_names[format], pixel->g); + break; + + case PNG_FORMAT_FLAG_ALPHA: + sprintf(string, "%s(%d,%d)", format_names[format], pixel->g, + pixel->a); + break; + + case PNG_FORMAT_FLAG_COLOR: + sprintf(string, "%s(%d,%d,%d)", format_names[format], + pixel->r, pixel->g, pixel->b); + break; + + case PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA: + sprintf(string, "%s(%d,%d,%d,%d)", format_names[format], + pixel->r, pixel->g, pixel->b, pixel->a); + break; + + default: + sprintf(string, "invalid-format"); + break; + } +} + +static int +logpixel(const Transform *transform, png_uint_32 x, png_uint_32 y, + const Pixel *in, const Pixel *calc, const Pixel *out, const char *reason) +{ + const png_uint_32 in_format = transform->in_image->image.format; + const png_uint_32 out_format = transform->out_image->image.format; + + png_uint_32 back_format = out_format & ~PNG_FORMAT_FLAG_ALPHA; + const char *via_linear = ""; + + char pixel_in[64], pixel_calc[64], pixel_out[64], pixel_loc[64]; + char background_info[100]; + + print_pixel(pixel_in, in, in_format); + print_pixel(pixel_calc, calc, out_format); + print_pixel(pixel_out, out, out_format); + + if (transform->is_palette) + sprintf(pixel_loc, "palette: %lu", (unsigned long)y); + else + sprintf(pixel_loc, "%lu,%lu", (unsigned long)x, (unsigned long)y); + + if (transform->from_linear != NULL) + { + via_linear = " (via linear)"; + /* And as a result the *read* format which did any background processing + * was itself linear, so the background color information is also + * linear. + */ + back_format |= PNG_FORMAT_FLAG_LINEAR; + } + + if (transform->background != NULL) + { + Pixel back; + char pixel_back[64]; + + back.r = transform->background->ir; + back.g = transform->background->ig; + back.b = transform->background->ib; + back.a = -1; /* not used */ + + print_pixel(pixel_back, &back, back_format); + sprintf(background_info, " on background %s", pixel_back); + } + + else + background_info[0] = 0; + + if (transform->in_image->file_name != transform->out_image->file_name) + { + char error_buffer[512]; + sprintf(error_buffer, + "(%s) %s error%s:\n %s%s ->\n %s\n not: %s.\n" + "Use --preserve and examine: ", pixel_loc, reason, via_linear, + pixel_in, background_info, pixel_out, pixel_calc); + return logerror(transform->in_image, transform->in_image->file_name, + error_buffer, transform->out_image->file_name); + } + + else + { + char error_buffer[512]; + sprintf(error_buffer, + "(%s) %s error%s:\n %s%s ->\n %s\n not: %s.\n" + " The error happened when reading the original file with this format.", + pixel_loc, reason, via_linear, pixel_in, background_info, pixel_out, + pixel_calc); + return logerror(transform->in_image, transform->in_image->file_name, + error_buffer, ""); + } +} + +static int +cmppixel(Transform *transform, png_const_voidp in, png_const_voidp out, + png_uint_32 x, png_uint_32 y/*or palette index*/) +{ + int maxerr; + png_const_charp errmsg; + Pixel pixel_in, pixel_calc, pixel_out; + + transform->in_gp(&pixel_in, in); + + if (transform->from_linear == NULL) + transform->transform(&pixel_calc, &pixel_in, transform->background); + + else + { + transform->transform(&pixel_out, &pixel_in, transform->background); + transform->from_linear(&pixel_calc, &pixel_out, NULL); + } + + transform->out_gp(&pixel_out, out); + + /* Eliminate the case where the input and output values match exactly. */ + if (pixel_calc.a == pixel_out.a && pixel_calc.r == pixel_out.r && + pixel_calc.g == pixel_out.g && pixel_calc.b == pixel_out.b) + return 1; + + /* Eliminate the case where the output pixel is transparent and the output + * is 8-bit - any component values are valid. Don't check the input alpha + * here to also skip the 16-bit small alpha cases. + */ + if (transform->output_8bit && pixel_calc.a == 0 && pixel_out.a == 0) + return 1; + + /* Check for alpha errors first; an alpha error can damage the components too + * so avoid spurious checks on components if one is found. + */ + errmsg = NULL; + { + int err_a = abs(pixel_calc.a-pixel_out.a); + + if (err_a > transform->error[3]) + { + /* If accumulating check the components too */ + if (transform->accumulate) + transform->error[3] = (png_uint_16)err_a; + + else + errmsg = "alpha"; + } + } + + /* Now if *either* of the output alphas are 0 but alpha is within tolerance + * eliminate the 8-bit component comparison. + */ + if (errmsg == NULL && transform->output_8bit && + (pixel_calc.a == 0 || pixel_out.a == 0)) + return 1; + + if (errmsg == NULL) /* else just signal an alpha error */ + { + int err_r = abs(pixel_calc.r - pixel_out.r); + int err_g = abs(pixel_calc.g - pixel_out.g); + int err_b = abs(pixel_calc.b - pixel_out.b); + int limit; + + if ((err_r | err_g | err_b) == 0) + return 1; /* exact match */ + + /* Mismatch on a component, check the input alpha */ + if (pixel_in.a >= transform->in_opaque) + { + errmsg = "opaque component"; + limit = 2; /* opaque */ + } + + else if (pixel_in.a > 0) + { + errmsg = "alpha component"; + limit = 1; /* partially transparent */ + } + + else + { + errmsg = "transparent component (background)"; + limit = 0; /* transparent */ + } + + maxerr = err_r; + if (maxerr < err_g) maxerr = err_g; + if (maxerr < err_b) maxerr = err_b; + + if (maxerr <= transform->error[limit]) + return 1; /* within the error limits */ + + /* Handle a component mis-match; log it, just return an error code, or + * accumulate it. + */ + if (transform->accumulate) + { + transform->error[limit] = (png_uint_16)maxerr; + return 1; /* to cause the caller to keep going */ + } + } + + /* Failure to match and not accumulating, so the error must be logged. */ + return logpixel(transform, x, y, &pixel_in, &pixel_calc, &pixel_out, errmsg); +} + +static png_byte +component_loc(png_byte loc[4], png_uint_32 format) +{ + /* Given a format return the number of channels and the location of + * each channel. + * + * The mask 'loc' contains the component offset of the channels in the + * following order. Note that if 'format' is grayscale the entries 1-3 must + * all contain the location of the gray channel. + * + * 0: alpha + * 1: red or gray + * 2: green or gray + * 3: blue or gray + */ + png_byte channels; + + if (format & PNG_FORMAT_FLAG_COLOR) + { + channels = 3; + + loc[2] = 1; + + if (format & PNG_FORMAT_FLAG_BGR) + { + loc[1] = 2; + loc[3] = 0; + } + + else + { + loc[1] = 0; + loc[3] = 2; + } + } + + else + { + channels = 1; + loc[1] = loc[2] = loc[3] = 0; + } + + if (format & PNG_FORMAT_FLAG_ALPHA) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + { + loc[0] = 0; + ++loc[1]; + ++loc[2]; + ++loc[3]; + } + + else + loc[0] = channels; + + ++channels; + } + + else + loc[0] = 4; /* not present */ + + return channels; +} + +/* Compare two images, the original 'a', which was written out then read back in + * to * give image 'b'. The formats may have been changed. + */ +static int +compare_two_images(Image *a, Image *b, int via_linear, + png_const_colorp background) +{ + ptrdiff_t stridea = a->stride; + ptrdiff_t strideb = b->stride; + png_const_bytep rowa = a->buffer+16; + png_const_bytep rowb = b->buffer+16; + const png_uint_32 width = a->image.width; + const png_uint_32 height = a->image.height; + const png_uint_32 formata = a->image.format; + const png_uint_32 formatb = b->image.format; + const unsigned int a_sample = PNG_IMAGE_SAMPLE_SIZE(formata); + const unsigned int b_sample = PNG_IMAGE_SAMPLE_SIZE(formatb); + int alpha_added, alpha_removed; + int bchannels; + int btoa[4]; + png_uint_32 y; + Transform tr; + + /* This should never happen: */ + if (width != b->image.width || height != b->image.height) + return logerror(a, a->file_name, ": width x height changed: ", + b->file_name); + + /* Set up the background and the transform */ + transform_from_formats(&tr, a, b, background, via_linear); + + /* Find the first row and inter-row space. */ + if (!(formata & PNG_FORMAT_FLAG_COLORMAP) && + (formata & PNG_FORMAT_FLAG_LINEAR)) + stridea *= 2; + + if (!(formatb & PNG_FORMAT_FLAG_COLORMAP) && + (formatb & PNG_FORMAT_FLAG_LINEAR)) + strideb *= 2; + + if (stridea < 0) rowa += (height-1) * (-stridea); + if (strideb < 0) rowb += (height-1) * (-strideb); + + /* First shortcut the two colormap case by comparing the image data; if it + * matches then we expect the colormaps to match, although this is not + * absolutely necessary for an image match. If the colormaps fail to match + * then there is a problem in libpng. + */ + if (formata & formatb & PNG_FORMAT_FLAG_COLORMAP) + { + /* Only check colormap entries that actually exist; */ + png_const_bytep ppa, ppb; + int match; + png_byte in_use[256], amax = 0, bmax = 0; + + memset(in_use, 0, sizeof in_use); + + ppa = rowa; + ppb = rowb; + + /* Do this the slow way to accumulate the 'in_use' flags, don't break out + * of the loop until the end; this validates the color-mapped data to + * ensure all pixels are valid color-map indexes. + */ + for (y=0, match=1; y bmax) + bmax = bval; + + if (bval != aval) + match = 0; + + in_use[aval] = 1; + if (aval > amax) + amax = aval; + } + } + + /* If the buffers match then the colormaps must too. */ + if (match) + { + /* Do the color-maps match, entry by entry? Only check the 'in_use' + * entries. An error here should be logged as a color-map error. + */ + png_const_bytep a_cmap = (png_const_bytep)a->colormap; + png_const_bytep b_cmap = (png_const_bytep)b->colormap; + int result = 1; /* match by default */ + + /* This is used in logpixel to get the error message correct. */ + tr.is_palette = 1; + + for (y=0; y<256; ++y, a_cmap += a_sample, b_cmap += b_sample) + if (in_use[y]) + { + /* The colormap entries should be valid, but because libpng doesn't + * do any checking at present the original image may contain invalid + * pixel values. These cause an error here (at present) unless + * accumulating errors in which case the program just ignores them. + */ + if (y >= a->image.colormap_entries) + { + if ((a->opts & ACCUMULATE) == 0) + { + char pindex[9]; + sprintf(pindex, "%lu[%lu]", (unsigned long)y, + (unsigned long)a->image.colormap_entries); + logerror(a, a->file_name, ": bad pixel index: ", pindex); + } + result = 0; + } + + else if (y >= b->image.colormap_entries) + { + if ((a->opts & ACCUMULATE) == 0) + { + char pindex[9]; + sprintf(pindex, "%lu[%lu]", (unsigned long)y, + (unsigned long)b->image.colormap_entries); + logerror(b, b->file_name, ": bad pixel index: ", pindex); + } + result = 0; + } + + /* All the mismatches are logged here; there can only be 256! */ + else if (!cmppixel(&tr, a_cmap, b_cmap, 0, y)) + result = 0; + } + + /* If reqested copy the error values back from the Transform. */ + if (a->opts & ACCUMULATE) + { + tr.error_ptr[0] = tr.error[0]; + tr.error_ptr[1] = tr.error[1]; + tr.error_ptr[2] = tr.error[2]; + tr.error_ptr[3] = tr.error[3]; + result = 1; /* force a continue */ + } + + return result; + } + + /* else the image buffers don't match pixel-wise so compare sample values + * instead, but first validate that the pixel indexes are in range (but + * only if not accumulating, when the error is ignored.) + */ + else if ((a->opts & ACCUMULATE) == 0) + { + /* Check the original image first, + * TODO: deal with input images with bad pixel values? + */ + if (amax >= a->image.colormap_entries) + { + char pindex[9]; + sprintf(pindex, "%d[%lu]", amax, + (unsigned long)a->image.colormap_entries); + return logerror(a, a->file_name, ": bad pixel index: ", pindex); + } + + else if (bmax >= b->image.colormap_entries) + { + char pindex[9]; + sprintf(pindex, "%d[%lu]", bmax, + (unsigned long)b->image.colormap_entries); + return logerror(b, b->file_name, ": bad pixel index: ", pindex); + } + } + } + + /* We can directly compare pixel values without the need to use the read + * or transform support (i.e. a memory compare) if: + * + * 1) The bit depth has not changed. + * 2) RGB to grayscale has not been done (the reverse is ok; we just compare + * the three RGB values to the original grayscale.) + * 3) An alpha channel has not been removed from an 8-bit format, or the + * 8-bit alpha value of the pixel was 255 (opaque). + * + * If an alpha channel has been *added* then it must have the relevant opaque + * value (255 or 65535). + * + * The fist two the tests (in the order given above) (using the boolean + * equivalence !a && !b == !(a || b)) + */ + if (!(((formata ^ formatb) & PNG_FORMAT_FLAG_LINEAR) | + (formata & (formatb ^ PNG_FORMAT_FLAG_COLOR) & PNG_FORMAT_FLAG_COLOR))) + { + /* Was an alpha channel changed? */ + const png_uint_32 alpha_changed = (formata ^ formatb) & + PNG_FORMAT_FLAG_ALPHA; + + /* Was an alpha channel removed? (The third test.) If so the direct + * comparison is only possible if the input alpha is opaque. + */ + alpha_removed = (formata & alpha_changed) != 0; + + /* Was an alpha channel added? */ + alpha_added = (formatb & alpha_changed) != 0; + + /* The channels may have been moved between input and output, this finds + * out how, recording the result in the btoa array, which says where in + * 'a' to find each channel of 'b'. If alpha was added then btoa[alpha] + * ends up as 4 (and is not used.) + */ + { + int i; + png_byte aloc[4]; + png_byte bloc[4]; + + /* The following are used only if the formats match, except that + * 'bchannels' is a flag for matching formats. btoa[x] says, for each + * channel in b, where to find the corresponding value in a, for the + * bchannels. achannels may be different for a gray to rgb transform + * (a will be 1 or 2, b will be 3 or 4 channels.) + */ + (void)component_loc(aloc, formata); + bchannels = component_loc(bloc, formatb); + + /* Hence the btoa array. */ + for (i=0; i<4; ++i) if (bloc[i] < 4) + btoa[bloc[i]] = aloc[i]; /* may be '4' for alpha */ + + if (alpha_added) + alpha_added = bloc[0]; /* location of alpha channel in image b */ + + else + alpha_added = 4; /* Won't match an image b channel */ + + if (alpha_removed) + alpha_removed = aloc[0]; /* location of alpha channel in image a */ + + else + alpha_removed = 4; + } + } + + else + { + /* Direct compare is not possible, cancel out all the corresponding local + * variables. + */ + bchannels = 0; + alpha_removed = alpha_added = 4; + btoa[3] = btoa[2] = btoa[1] = btoa[0] = 4; /* 4 == not present */ + } + + for (y=0; ycolormap + a_sample * *ppa++; + else + psa = ppa, ppa += a_sample; + + if (formatb & PNG_FORMAT_FLAG_COLORMAP) + psb = (png_const_bytep)b->colormap + b_sample * *ppb++; + else + psb = ppb, ppb += b_sample; + + /* Do the fast test if possible. */ + if (bchannels) + { + /* Check each 'b' channel against either the corresponding 'a' + * channel or the opaque alpha value, as appropriate. If + * alpha_removed value is set (not 4) then also do this only if the + * 'a' alpha channel (alpha_removed) is opaque; only relevant for + * the 8-bit case. + */ + if (formatb & PNG_FORMAT_FLAG_LINEAR) /* 16-bit checks */ + { + png_const_uint_16p pua = aligncastconst(png_const_uint_16p, psa); + png_const_uint_16p pub = aligncastconst(png_const_uint_16p, psb); + + switch (bchannels) + { + case 4: + if (pua[btoa[3]] != pub[3]) break; + case 3: + if (pua[btoa[2]] != pub[2]) break; + case 2: + if (pua[btoa[1]] != pub[1]) break; + case 1: + if (pua[btoa[0]] != pub[0]) break; + if (alpha_added != 4 && pub[alpha_added] != 65535) break; + continue; /* x loop */ + default: + break; /* impossible */ + } + } + + else if (alpha_removed == 4 || psa[alpha_removed] == 255) + { + switch (bchannels) + { + case 4: + if (psa[btoa[3]] != psb[3]) break; + case 3: + if (psa[btoa[2]] != psb[2]) break; + case 2: + if (psa[btoa[1]] != psb[1]) break; + case 1: + if (psa[btoa[0]] != psb[0]) break; + if (alpha_added != 4 && psb[alpha_added] != 255) break; + continue; /* x loop */ + default: + break; /* impossible */ + } + } + } + + /* If we get to here the fast match failed; do the slow match for this + * pixel. + */ + if (!cmppixel(&tr, psa, psb, x, y) && (a->opts & KEEP_GOING) == 0) + return 0; /* error case */ + } + } + + /* If reqested copy the error values back from the Transform. */ + if (a->opts & ACCUMULATE) + { + tr.error_ptr[0] = tr.error[0]; + tr.error_ptr[1] = tr.error[1]; + tr.error_ptr[2] = tr.error[2]; + tr.error_ptr[3] = tr.error[3]; + } + + return 1; +} + +/* Read the file; how the read gets done depends on which of input_file and + * input_memory have been set. + */ +static int +read_file(Image *image, png_uint_32 format, png_const_colorp background) +{ + memset(&image->image, 0, sizeof image->image); + image->image.version = PNG_IMAGE_VERSION; + + if (image->input_memory != NULL) + { + if (!png_image_begin_read_from_memory(&image->image, image->input_memory, + image->input_memory_size)) + return logerror(image, "memory init: ", image->file_name, ""); + } + + else if (image->input_file != NULL) + { + if (!png_image_begin_read_from_stdio(&image->image, image->input_file)) + return logerror(image, "stdio init: ", image->file_name, ""); + } + + else + { + if (!png_image_begin_read_from_file(&image->image, image->file_name)) + return logerror(image, "file init: ", image->file_name, ""); + } + + /* Have an initialized image with all the data we need plus, maybe, an + * allocated file (myfile) or buffer (mybuffer) that need to be freed. + */ + { + int result; + png_uint_32 image_format; + + /* Print both original and output formats. */ + image_format = image->image.format; + + if (image->opts & VERBOSE) + { + printf("%s %lu x %lu %s -> %s", image->file_name, + (unsigned long)image->image.width, + (unsigned long)image->image.height, + format_names[image_format & FORMAT_MASK], + (format & FORMAT_NO_CHANGE) != 0 || image->image.format == format + ? "no change" : format_names[format & FORMAT_MASK]); + + if (background != NULL) + printf(" background(%d,%d,%d)\n", background->red, + background->green, background->blue); + else + printf("\n"); + + fflush(stdout); + } + + /* 'NO_CHANGE' combined with the color-map flag forces the base format + * flags to be set on read to ensure that the original representation is + * not lost in the pass through a colormap format. + */ + if ((format & FORMAT_NO_CHANGE) != 0) + { + if ((format & PNG_FORMAT_FLAG_COLORMAP) != 0 && + (image_format & PNG_FORMAT_FLAG_COLORMAP) != 0) + format = (image_format & ~BASE_FORMATS) | (format & BASE_FORMATS); + + else + format = image_format; + } + + image->image.format = format; + + image->stride = PNG_IMAGE_ROW_STRIDE(image->image) + image->stride_extra; + allocbuffer(image); + + result = png_image_finish_read(&image->image, background, + image->buffer+16, (png_int_32)image->stride, image->colormap); + + checkbuffer(image, image->file_name); + + if (result) + return checkopaque(image); + + else + return logerror(image, image->file_name, ": image read failed", ""); + } +} + +/* Reads from a filename, which must be in image->file_name, but uses + * image->opts to choose the method. The file is always read in its native + * format (the one the simplified API suggests). + */ +static int +read_one_file(Image *image) +{ + if (!(image->opts & READ_FILE) || (image->opts & USE_STDIO)) + { + /* memory or stdio. */ + FILE *f = fopen(image->file_name, "rb"); + + if (f != NULL) + { + if (image->opts & READ_FILE) + image->input_file = f; + + else /* memory */ + { + if (fseek(f, 0, SEEK_END) == 0) + { + long int cb = ftell(f); + + if (cb > 0 && (unsigned long int)cb < (size_t)~(size_t)0) + { + png_bytep b = voidcast(png_bytep, malloc((size_t)cb)); + + if (b != NULL) + { + rewind(f); + + if (fread(b, (size_t)cb, 1, f) == 1) + { + fclose(f); + image->input_memory_size = cb; + image->input_memory = b; + } + + else + { + free(b); + return logclose(image, f, image->file_name, + ": read failed: "); + } + } + + else + return logclose(image, f, image->file_name, + ": out of memory: "); + } + + else if (cb == 0) + return logclose(image, f, image->file_name, + ": zero length: "); + + else + return logclose(image, f, image->file_name, + ": tell failed: "); + } + + else + return logclose(image, f, image->file_name, ": seek failed: "); + } + } + + else + return logerror(image, image->file_name, ": open failed: ", + strerror(errno)); + } + + return read_file(image, FORMAT_NO_CHANGE, NULL); +} + +#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED +static int +write_one_file(Image *output, Image *image, int convert_to_8bit) +{ + if (image->opts & FAST_WRITE) + image->image.flags |= PNG_IMAGE_FLAG_FAST; + + if (image->opts & USE_STDIO) + { + FILE *f = tmpfile(); + + if (f != NULL) + { + if (png_image_write_to_stdio(&image->image, f, convert_to_8bit, + image->buffer+16, (png_int_32)image->stride, image->colormap)) + { + if (fflush(f) == 0) + { + rewind(f); + initimage(output, image->opts, "tmpfile", image->stride_extra); + output->input_file = f; + if (!checkopaque(image)) + return 0; + } + + else + return logclose(image, f, "tmpfile", ": flush: "); + } + + else + { + fclose(f); + return logerror(image, "tmpfile", ": write failed", ""); + } + } + + else + return logerror(image, "tmpfile", ": open: ", strerror(errno)); + } + + else + { + static int counter = 0; + char name[32]; + + sprintf(name, "TMP%d.png", ++counter); + + if (png_image_write_to_file(&image->image, name, convert_to_8bit, + image->buffer+16, (png_int_32)image->stride, image->colormap)) + { + initimage(output, image->opts, output->tmpfile_name, + image->stride_extra); + /* Afterwards, or freeimage will delete it! */ + strcpy(output->tmpfile_name, name); + + if (!checkopaque(image)) + return 0; + } + + else + return logerror(image, name, ": write failed", ""); + } + + /* 'output' has an initialized temporary image, read this back in and compare + * this against the original: there should be no change since the original + * format was written unmodified unless 'convert_to_8bit' was specified. + * However, if the original image was color-mapped, a simple read will zap + * the linear, color and maybe alpha flags, this will cause spurious failures + * under some circumstances. + */ + if (read_file(output, image->image.format | FORMAT_NO_CHANGE, NULL)) + { + png_uint_32 original_format = image->image.format; + + if (convert_to_8bit) + original_format &= ~PNG_FORMAT_FLAG_LINEAR; + + if ((output->image.format & BASE_FORMATS) != + (original_format & BASE_FORMATS)) + return logerror(image, image->file_name, ": format changed on read: ", + output->file_name); + + return compare_two_images(image, output, 0/*via linear*/, NULL); + } + + else + return logerror(output, output->tmpfile_name, + ": read of new file failed", ""); +} +#endif + +static int +testimage(Image *image, png_uint_32 opts, format_list *pf) +{ + int result; + Image copy; + + /* Copy the original data, stealing it from 'image' */ + checkopaque(image); + copy = *image; + + copy.opts = opts; + copy.buffer = NULL; + copy.bufsize = 0; + copy.allocsize = 0; + + image->input_file = NULL; + image->input_memory = NULL; + image->input_memory_size = 0; + image->tmpfile_name[0] = 0; + + { + png_uint_32 counter; + Image output; + + newimage(&output); + + result = 1; + + /* Use the low bit of 'counter' to indicate whether or not to do alpha + * removal with a background color or by composting onto the image; this + * step gets skipped if it isn't relevant + */ + for (counter=0; counter<2*FORMAT_COUNT; ++counter) + if (format_isset(pf, counter >> 1)) + { + png_uint_32 format = counter >> 1; + + png_color background_color; + png_colorp background = NULL; + + /* If there is a format change that removes the alpha channel then + * the background is relevant. If the output is 8-bit color-mapped + * then a background color *must* be provided, otherwise there are + * two tests to do - one with a color, the other with NULL. The + * NULL test happens second. + */ + if ((counter & 1) == 0) + { + if ((format & PNG_FORMAT_FLAG_ALPHA) == 0 && + (image->image.format & PNG_FORMAT_FLAG_ALPHA) != 0) + { + /* Alpha/transparency will be removed, the background is + * relevant: make it a color the first time + */ + random_color(&background_color); + background = &background_color; + + /* BUT if the output is to a color-mapped 8-bit format then + * the background must always be a color, so increment 'counter' + * to skip the NULL test. + */ + if ((format & PNG_FORMAT_FLAG_COLORMAP) != 0 && + (format & PNG_FORMAT_FLAG_LINEAR) == 0) + ++counter; + } + + /* Otherwise an alpha channel is not being eliminated, just leave + * background NULL and skip the (counter & 1) NULL test. + */ + else + ++counter; + } + /* else just use NULL for background */ + + resetimage(©); + copy.opts = opts; /* in case read_file needs to change it */ + + result = read_file(©, format, background); + if (!result) + break; + + /* Make sure the file just read matches the original file. */ + result = compare_two_images(image, ©, 0/*via linear*/, background); + if (!result) + break; + +# ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED + /* Write the *copy* just made to a new file to make sure the write + * side works ok. Check the conversion to sRGB if the copy is + * linear. + */ + output.opts = opts; + result = write_one_file(&output, ©, 0/*convert to 8bit*/); + if (!result) + break; + + /* Validate against the original too; the background is needed here + * as well so that compare_two_images knows what color was used. + */ + result = compare_two_images(image, &output, 0, background); + if (!result) + break; + + if ((format & PNG_FORMAT_FLAG_LINEAR) != 0 && + (format & PNG_FORMAT_FLAG_COLORMAP) == 0) + { + /* 'output' is linear, convert to the corresponding sRGB format. + */ + output.opts = opts; + result = write_one_file(&output, ©, 1/*convert to 8bit*/); + if (!result) + break; + + /* This may involve a conversion via linear; in the ideal world + * this would round-trip correctly, but libpng 1.5.7 is not the + * ideal world so allow a drift (error_via_linear). + * + * 'image' has an alpha channel but 'output' does not then there + * will a strip-alpha-channel operation (because 'output' is + * linear), handle this by composing on black when doing the + * comparison. + */ + result = compare_two_images(image, &output, 1/*via_linear*/, + background); + if (!result) + break; + } +# endif /* PNG_SIMPLIFIED_WRITE_SUPPORTED */ + } + + freeimage(&output); + } + + freeimage(©); + + return result; +} + +static int +test_one_file(const char *file_name, format_list *formats, png_uint_32 opts, + int stride_extra, int log_pass) +{ + int result; + Image image; + + newimage(&image); + initimage(&image, opts, file_name, stride_extra); + result = read_one_file(&image); + if (result) + result = testimage(&image, opts, formats); + freeimage(&image); + + /* Ensure that stderr is flushed into any log file */ + fflush(stderr); + + if (log_pass) + { + if (result) + printf("PASS:"); + + else + printf("FAIL:"); + +# ifndef PNG_SIMPLIFIED_WRITE_SUPPORTED + printf(" (no write)"); +# endif + + print_opts(opts); + printf(" %s\n", file_name); + /* stdout may not be line-buffered if it is piped to a file, so: */ + fflush(stdout); + } + + else if (!result) + exit(1); + + return result; +} + +int +main(int argc, char **argv) +{ + png_uint_32 opts = FAST_WRITE; + format_list formats; + const char *touch = NULL; + int log_pass = 0; + int redundant = 0; + int stride_extra = 0; + int retval = 0; + int c; + + init_sRGB_to_d(); +#if 0 + init_error_via_linear(); +#endif + format_init(&formats); + + for (c=1; c FORMAT_COUNT) + exit(1); + + format_set(&formats, format); + } + else if (arg[0] == '-' && arg[1] != 0 && (arg[1] != '0' || arg[2] != 0)) + { + fflush(stdout); + fprintf(stderr, "%s: unknown option: %s\n", argv[0], arg); + exit(1); + } + else + { + if (format_is_initial(&formats)) + format_default(&formats, redundant); + + if (arg[0] == '-') + { + const int term = (arg[1] == '0' ? 0 : '\n'); + unsigned int ich = 0; + + /* Loop reading files, use a static buffer to simplify this and just + * stop if the name gets to long. + */ + static char buffer[4096]; + + do + { + int ch = getchar(); + + /* Don't allow '\0' in file names, and terminate with '\n' or, + * for -0, just '\0' (use -print0 to find to make this work!) + */ + if (ch == EOF || ch == term || ch == 0) + { + buffer[ich] = 0; + + if (ich > 0 && !test_one_file(buffer, &formats, opts, + stride_extra, log_pass)) + retval = 1; + + if (ch == EOF) + break; + + ich = 0; + --ich; /* so that the increment below sets it to 0 again */ + } + + else + buffer[ich] = (char)ch; + } while (++ich < sizeof buffer); + + if (ich) + { + buffer[32] = 0; + buffer[4095] = 0; + fprintf(stderr, "%s...%s: file name too long\n", buffer, + buffer+(4096-32)); + exit(1); + } + } + + else if (!test_one_file(arg, &formats, opts, stride_extra, log_pass)) + retval = 1; + } + } + + if (opts & ACCUMULATE) + { + unsigned int in; + + printf("static png_uint_16 gpc_error[16/*in*/][16/*out*/][4/*a*/] =\n"); + printf("{\n"); + for (in=0; in<16; ++in) + { + unsigned int out; + printf(" { /* input: %s */\n ", format_names[in]); + for (out=0; out<16; ++out) + { + unsigned int alpha; + printf(" {"); + for (alpha=0; alpha<4; ++alpha) + { + printf(" %d", gpc_error[in][out][alpha]); + if (alpha < 3) putchar(','); + } + printf(" }"); + if (out < 15) + { + putchar(','); + if (out % 4 == 3) printf("\n "); + } + } + printf("\n }"); + + if (in < 15) + putchar(','); + else + putchar('\n'); + } + printf("};\n"); + + printf("static png_uint_16 gpc_error_via_linear[16][4/*out*/][4] =\n"); + printf("{\n"); + for (in=0; in<16; ++in) + { + unsigned int out; + printf(" { /* input: %s */\n ", format_names[in]); + for (out=0; out<4; ++out) + { + unsigned int alpha; + printf(" {"); + for (alpha=0; alpha<4; ++alpha) + { + printf(" %d", gpc_error_via_linear[in][out][alpha]); + if (alpha < 3) putchar(','); + } + printf(" }"); + if (out < 3) + putchar(','); + } + printf("\n }"); + + if (in < 15) + putchar(','); + else + putchar('\n'); + } + printf("};\n"); + + printf("static png_uint_16 gpc_error_to_colormap[8/*i*/][8/*o*/][4] =\n"); + printf("{\n"); + for (in=0; in<8; ++in) + { + unsigned int out; + printf(" { /* input: %s */\n ", format_names[in]); + for (out=0; out<8; ++out) + { + unsigned int alpha; + printf(" {"); + for (alpha=0; alpha<4; ++alpha) + { + printf(" %d", gpc_error_to_colormap[in][out][alpha]); + if (alpha < 3) putchar(','); + } + printf(" }"); + if (out < 7) + { + putchar(','); + if (out % 4 == 3) printf("\n "); + } + } + printf("\n }"); + + if (in < 7) + putchar(','); + else + putchar('\n'); + } + printf("};\n"); + } + + if (retval == 0 && touch != NULL) + { + FILE *fsuccess = fopen(touch, "wt"); + + if (fsuccess != NULL) + { + int error = 0; + fprintf(fsuccess, "PNG simple API tests succeeded\n"); + fflush(fsuccess); + error = ferror(fsuccess); + + if (fclose(fsuccess) || error) + { + fflush(stdout); + fprintf(stderr, "%s: write failed\n", touch); + exit(1); + } + } + + else + { + fflush(stdout); + fprintf(stderr, "%s: open failed\n", touch); + exit(1); + } + } + + return retval; +} + +#else /* !PNG_SIMPLIFIED_READ_SUPPORTED */ +int main(void) +{ + fprintf(stderr, "pngstest: no read support in libpng, test skipped\n"); + return 0; +} +#endif /* PNG_SIMPLIFIED_READ_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/contrib/libtests/pngunknown.c libpng-1.6.0beta32/contrib/libtests/pngunknown.c --- libpng-1.5.13/contrib/libtests/pngunknown.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/pngunknown.c 2012-11-25 12:40:12.917725263 -0600 @@ -0,0 +1,960 @@ + +/* pngunknown.c - test the read side unknown chunk handling + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * Copyright (c) 2012 Glenn Randers-Pehrson + * Written by John Cunningham Bowler + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * NOTES: + * This is a C program that is intended to be linked against libpng. It + * allows the libpng unknown handling code to be tested by interpreting + * arguments to save or discard combinations of chunks. The program is + * currently just a minimal validation for the built-in libpng facilities. + */ + +#include +#include +#include +#include + +/* Define the following to use this test against your installed libpng, rather + * than the one being built here: + */ +#ifdef PNG_FREESTANDING_TESTS +# include +#else +# include "../../png.h" +#endif + +#ifdef PNG_READ_SUPPORTED + +#if PNG_LIBPNG_VER < 10500 +/* This deliberately lacks the PNG_CONST. */ +typedef png_byte *png_const_bytep; + +/* This is copied from 1.5.1 png.h: */ +#define PNG_INTERLACE_ADAM7_PASSES 7 +#define PNG_PASS_START_ROW(pass) (((1U&~(pass))<<(3-((pass)>>1)))&7) +#define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7) +#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) +#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) +#define PNG_PASS_ROWS(height, pass) (((height)+(((1<>PNG_PASS_ROW_SHIFT(pass)) +#define PNG_PASS_COLS(width, pass) (((width)+(((1<>PNG_PASS_COL_SHIFT(pass)) +#define PNG_ROW_FROM_PASS_ROW(yIn, pass) \ + (((yIn)<>(((7-(off))-(pass))<<2)) & 0xFU) | \ + ((0x01145AF0U>>(((7-(off))-(pass))<<2)) & 0xF0U)) +#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ + ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) +#define PNG_COL_IN_INTERLACE_PASS(x, pass) \ + ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) + +/* These are needed too for the default build: */ +#define PNG_WRITE_16BIT_SUPPORTED +#define PNG_READ_16BIT_SUPPORTED + +/* This comes from pnglibconf.h afer 1.5: */ +#define PNG_FP_1 100000 +#define PNG_GAMMA_THRESHOLD_FIXED\ + ((png_fixed_point)(PNG_GAMMA_THRESHOLD * PNG_FP_1)) +#endif + +#if PNG_LIBPNG_VER < 10600 + /* 1.6.0 constifies many APIs. The following exists to allow pngvalid to be + * compiled against earlier versions. + */ +# define png_const_structp png_structp +#endif + + +/* Copied from pngpriv.h */ +#define PNG_32b(b,s) ((png_uint_32)(b) << (s)) +#define PNG_CHUNK(b1,b2,b3,b4) \ + (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) + +#define png_IHDR PNG_CHUNK( 73, 72, 68, 82) +#define png_IDAT PNG_CHUNK( 73, 68, 65, 84) +#define png_IEND PNG_CHUNK( 73, 69, 78, 68) +#define png_PLTE PNG_CHUNK( 80, 76, 84, 69) +#define png_bKGD PNG_CHUNK( 98, 75, 71, 68) +#define png_cHRM PNG_CHUNK( 99, 72, 82, 77) +#define png_gAMA PNG_CHUNK(103, 65, 77, 65) +#define png_hIST PNG_CHUNK(104, 73, 83, 84) +#define png_iCCP PNG_CHUNK(105, 67, 67, 80) +#define png_iTXt PNG_CHUNK(105, 84, 88, 116) +#define png_oFFs PNG_CHUNK(111, 70, 70, 115) +#define png_pCAL PNG_CHUNK(112, 67, 65, 76) +#define png_sCAL PNG_CHUNK(115, 67, 65, 76) +#define png_pHYs PNG_CHUNK(112, 72, 89, 115) +#define png_sBIT PNG_CHUNK(115, 66, 73, 84) +#define png_sPLT PNG_CHUNK(115, 80, 76, 84) +#define png_sRGB PNG_CHUNK(115, 82, 71, 66) +#define png_sTER PNG_CHUNK(115, 84, 69, 82) +#define png_tEXt PNG_CHUNK(116, 69, 88, 116) +#define png_tIME PNG_CHUNK(116, 73, 77, 69) +#define png_tRNS PNG_CHUNK(116, 82, 78, 83) +#define png_zTXt PNG_CHUNK(122, 84, 88, 116) +#define png_vpAg PNG_CHUNK('v', 'p', 'A', 'g') + +/* Test on flag values as defined in the spec (section 5.4): */ +#define PNG_CHUNK_ANCILLARY(c ) (1 & ((c) >> 29)) +#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) +#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) +#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) +#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) + +/* Chunk information */ +#define PNG_INFO_tEXt 0x10000000U +#define PNG_INFO_iTXt 0x20000000U +#define PNG_INFO_zTXt 0x40000000U + +#define PNG_INFO_sTER 0x01000000U +#define PNG_INFO_vpAg 0x02000000U + +#define ABSENT 0 +#define START 1 +#define END 2 + +static struct +{ + char name[5]; + png_uint_32 flag; + png_uint_32 tag; + int unknown; /* Chunk not known to libpng */ + int all; /* Chunk set by the '-1' option */ + int position; /* position in pngtest.png */ + int keep; /* unknown handling setting */ +} chunk_info[] = { + /* Critical chunks */ + { "IDAT", PNG_INFO_IDAT, png_IDAT, 0, 0, START, 0 }, /* must be [0] */ + { "PLTE", PNG_INFO_PLTE, png_PLTE, 0, 0, ABSENT, 0 }, + + /* Non-critical chunks that libpng handles */ + { "bKGD", PNG_INFO_bKGD, png_bKGD, 0, 1, START, 0 }, + { "cHRM", PNG_INFO_cHRM, png_cHRM, 0, 1, START, 0 }, + { "gAMA", PNG_INFO_gAMA, png_gAMA, 0, 1, START, 0 }, + { "hIST", PNG_INFO_hIST, png_hIST, 0, 1, ABSENT, 0 }, + { "iCCP", PNG_INFO_iCCP, png_iCCP, 0, 1, ABSENT, 0 }, + { "iTXt", PNG_INFO_iTXt, png_iTXt, 0, 1, ABSENT, 0 }, + { "oFFs", PNG_INFO_oFFs, png_oFFs, 0, 1, START, 0 }, + { "pCAL", PNG_INFO_pCAL, png_pCAL, 0, 1, START, 0 }, + { "pHYs", PNG_INFO_pHYs, png_pHYs, 0, 1, START, 0 }, + { "sBIT", PNG_INFO_sBIT, png_sBIT, 0, 1, START, 0 }, + { "sCAL", PNG_INFO_sCAL, png_sCAL, 0, 1, START, 0 }, + { "sPLT", PNG_INFO_sPLT, png_sPLT, 0, 1, ABSENT, 0 }, + { "sRGB", PNG_INFO_sRGB, png_sRGB, 0, 1, START, 0 }, + { "tEXt", PNG_INFO_tEXt, png_tEXt, 0, 1, START, 0 }, + { "tIME", PNG_INFO_tIME, png_tIME, 0, 1, START, 0 }, + { "tRNS", PNG_INFO_tRNS, png_tRNS, 0, 0, ABSENT, 0 }, + { "zTXt", PNG_INFO_zTXt, png_zTXt, 0, 1, END, 0 }, + + /* No libpng handling */ + { "sTER", PNG_INFO_sTER, png_sTER, 1, 1, START, 0 }, + { "vpAg", PNG_INFO_vpAg, png_vpAg, 1, 0, START, 0 }, +}; + +#define NINFO ((int)((sizeof chunk_info)/(sizeof chunk_info[0]))) + +static void +clear_keep(void) +{ + int i = NINFO; + while (--i >= 0) + chunk_info[i].keep = 0; +} + +static int +find(const char *name) +{ + int i = NINFO; + while (--i >= 0) + { + if (memcmp(chunk_info[i].name, name, 4) == 0) + break; + } + + return i; +} + +static int +findb(const png_byte *name) +{ + int i = NINFO; + while (--i >= 0) + { + if (memcmp(chunk_info[i].name, name, 4) == 0) + break; + } + + return i; +} + +static int +find_by_flag(png_uint_32 flag) +{ + int i = NINFO; + + while (--i >= 0) if (chunk_info[i].flag == flag) return i; + + fprintf(stderr, "pngunknown: internal error\n"); + exit(4); +} + +static int +ancillary(const char *name) +{ + return PNG_CHUNK_ANCILLARY(PNG_CHUNK(name[0], name[1], name[2], name[3])); +} + +static int +ancillaryb(const png_byte *name) +{ + return PNG_CHUNK_ANCILLARY(PNG_CHUNK(name[0], name[1], name[2], name[3])); +} + +/* Type of an error_ptr */ +typedef struct +{ + jmp_buf error_return; + png_structp png_ptr; + png_infop info_ptr, end_ptr; + int error_count; + int warning_count; + const char *program; + const char *file; + const char *test; +} display; + +static const char init[] = "initialization"; +static const char cmd[] = "command line"; + +static void +init_display(display *d, const char *program) +{ + memset(d, 0, sizeof *d); + d->png_ptr = NULL; + d->info_ptr = d->end_ptr = NULL; + d->error_count = d->warning_count = 0; + d->program = program; + d->file = program; + d->test = init; +} + +static void +clean_display(display *d) +{ + png_destroy_read_struct(&d->png_ptr, &d->info_ptr, &d->end_ptr); + + /* This must not happen - it might cause an app crash */ + if (d->png_ptr != NULL || d->info_ptr != NULL || d->end_ptr != NULL) + { + fprintf(stderr, "%s(%s): png_destroy_read_struct error\n", d->file, + d->test); + exit(1); + } + + /* Invalidate the test */ + d->test = init; +} + +PNG_FUNCTION(void, display_exit, (display *d), static PNG_NORETURN) +{ + ++(d->error_count); + + if (d->png_ptr != NULL) + clean_display(d); + + /* During initialization and if this is a single command line argument set + * exit now - there is only one test, otherwise longjmp to do the next test. + */ + if (d->test == init || d->test == cmd) + exit(1); + + longjmp(d->error_return, 1); +} + +static int +display_rc(const display *d, int strict) +{ + return d->error_count + (strict ? d->warning_count : 0); +} + +/* libpng error and warning callbacks */ +PNG_FUNCTION(void, error, (png_structp png_ptr, const char *message), + static PNG_NORETURN) +{ + display *d = (display*)png_get_error_ptr(png_ptr); + + fprintf(stderr, "%s(%s): libpng error: %s\n", d->file, d->test, message); + display_exit(d); +} + +static void +warning(png_structp png_ptr, const char *message) +{ + display *d = (display*)png_get_error_ptr(png_ptr); + + fprintf(stderr, "%s(%s): libpng warning: %s\n", d->file, d->test, message); + ++(d->warning_count); +} + +static png_uint_32 +get_valid(display *d, png_const_infop info_ptr) +{ + png_uint_32 flags = png_get_valid(d->png_ptr, info_ptr, (png_uint_32)~0); + + /* Map the text chunks back into the flags */ + { + png_textp text; + png_uint_32 ntext = png_get_text(d->png_ptr, info_ptr, &text, NULL); + + while (ntext-- > 0) switch (text[ntext].compression) + { + case -1: + flags |= PNG_INFO_tEXt; + break; + case 0: + flags |= PNG_INFO_zTXt; + break; + case 1: + case 2: + flags |= PNG_INFO_iTXt; + break; + default: + fprintf(stderr, "%s(%s): unknown text compression %d\n", d->file, + d->test, text[ntext].compression); + display_exit(d); + } + } + + return flags; +} + +static png_uint_32 +get_unknown(display *d, int def, png_const_infop info_ptr) +{ + /* Create corresponding 'unknown' flags */ + png_uint_32 flags = 0; + { + png_unknown_chunkp unknown; + int num_unknown = png_get_unknown_chunks(d->png_ptr, info_ptr, &unknown); + + while (--num_unknown >= 0) + { + int chunk = findb(unknown[num_unknown].name); + + /* Chunks not known to pngunknown must be validated here; since they + * must also be unknown to libpng the 'def' behavior should have been + * used. + */ + if (chunk < 0) switch (def) + { + default: /* impossible */ + case PNG_HANDLE_CHUNK_AS_DEFAULT: + case PNG_HANDLE_CHUNK_NEVER: + fprintf(stderr, "%s(%s): %s: %s: unknown chunk saved\n", + d->file, d->test, def ? "discard" : "default", + unknown[num_unknown].name); + ++(d->error_count); + break; + + case PNG_HANDLE_CHUNK_IF_SAFE: + if (!ancillaryb(unknown[num_unknown].name)) + { + fprintf(stderr, + "%s(%s): if-safe: %s: unknown critical chunk saved\n", + d->file, d->test, unknown[num_unknown].name); + ++(d->error_count); + break; + } + /* FALL THROUGH (safe) */ + case PNG_HANDLE_CHUNK_ALWAYS: + break; + } + + else + flags |= chunk_info[chunk].flag; + } + } + + return flags; +} + +static int +check(FILE *fp, int argc, const char **argv, png_uint_32p flags/*out*/, + display *d) +{ + int i, def = PNG_HANDLE_CHUNK_AS_DEFAULT, npasses, ipass; + png_uint_32 height; + + /* Some of these errors are permanently fatal and cause an exit here, others + * are per-test and cause an error return. + */ + d->png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, d, error, + warning); + if (d->png_ptr == NULL) + { + fprintf(stderr, "%s(%s): could not allocate png struct\n", d->file, + d->test); + /* Terminate here, this error is not test specific. */ + exit(1); + } + + d->info_ptr = png_create_info_struct(d->png_ptr); + d->end_ptr = png_create_info_struct(d->png_ptr); + if (d->info_ptr == NULL || d->end_ptr == NULL) + { + fprintf(stderr, "%s(%s): could not allocate png info\n", d->file, + d->test); + clean_display(d); + exit(1); + } + + png_init_io(d->png_ptr, fp); + + /* Handle each argument in turn; multiple settings are possible for the same + * chunk and multiple calls will occur (the last one should override all + * preceding ones). + */ + for (i=0; ipng_ptr, option, name, 1); + chunk_info[chunk].keep = option; +# endif + continue; + } + + break; + + case 7: /* default */ + if (memcmp(argv[i], "default", 7) == 0) + { +# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED + png_set_keep_unknown_chunks(d->png_ptr, option, NULL, 0); +# endif + def = option; + continue; + } + + break; + + case 3: /* all */ + if (memcmp(argv[i], "all", 3) == 0) + { +# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED + png_set_keep_unknown_chunks(d->png_ptr, option, NULL, -1); + def = option; + + for (chunk = 0; chunk < NINFO; ++chunk) + if (chunk_info[chunk].all) + chunk_info[chunk].keep = option; +# endif + continue; + } + + break; + + default: /* some misplaced = */ + + break; + } + } + + fprintf(stderr, "%s(%s): %s: unrecognized chunk argument\n", d->file, + d->test, argv[i]); + display_exit(d); + } + + png_read_info(d->png_ptr, d->info_ptr); + + switch (png_get_interlace_type(d->png_ptr, d->info_ptr)) + { + case PNG_INTERLACE_NONE: + npasses = 1; + break; + + case PNG_INTERLACE_ADAM7: + npasses = PNG_INTERLACE_ADAM7_PASSES; + break; + + default: + /* Hard error because it is not test specific */ + fprintf(stderr, "%s(%s): invalid interlace type\n", d->file, d->test); + clean_display(d); + exit(1); + } + + /* Skip the image data, if IDAT is not being handled then don't do this + * because it will cause a CRC error. + */ + if (chunk_info[0/*IDAT*/].keep == PNG_HANDLE_CHUNK_AS_DEFAULT) + { + png_start_read_image(d->png_ptr); + height = png_get_image_height(d->png_ptr, d->info_ptr); + + if (npasses > 1) + { + png_uint_32 width = png_get_image_width(d->png_ptr, d->info_ptr); + + for (ipass=0; ipass 0) + { + png_uint_32 y; + + for (y=0; ypng_ptr, NULL, NULL); + } + } + } /* interlaced */ + + else /* not interlaced */ + { + png_uint_32 y; + + for (y=0; ypng_ptr, NULL, NULL); + } + } + + png_read_end(d->png_ptr, d->end_ptr); + + flags[0] = get_valid(d, d->info_ptr); + flags[1] = get_unknown(d, def, d->info_ptr); + + /* Only png_read_png sets PNG_INFO_IDAT! */ + flags[chunk_info[0/*IDAT*/].keep != PNG_HANDLE_CHUNK_AS_DEFAULT] |= + PNG_INFO_IDAT; + + flags[2] = get_valid(d, d->end_ptr); + flags[3] = get_unknown(d, def, d->end_ptr); + + clean_display(d); + + return def; +} + +static void +check_error(display *d, png_uint_32 flags, const char *message) +{ + while (flags) + { + png_uint_32 flag = flags & -(png_int_32)flags; + int i = find_by_flag(flag); + + fprintf(stderr, "%s(%s): chunk %s: %s\n", d->file, d->test, + chunk_info[i].name, message); + ++(d->error_count); + + flags &= ~flag; + } +} + +static void +check_handling(display *d, int def, png_uint_32 chunks, png_uint_32 known, + png_uint_32 unknown, const char *position) +{ + while (chunks) + { + png_uint_32 flag = chunks & -(png_int_32)chunks; + int i = find_by_flag(flag); + int keep = chunk_info[i].keep; + const char *type; + const char *errorx = NULL; + + if (chunk_info[i].unknown) + { + if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT) + { + type = "UNKNOWN (default)"; + keep = def; + } + + else + type = "UNKNOWN (specified)"; + + if (flag & known) + errorx = "chunk processed"; + + else switch (keep) + { + case PNG_HANDLE_CHUNK_AS_DEFAULT: + if (flag & unknown) + errorx = "DEFAULT: unknown chunk saved"; + break; + + case PNG_HANDLE_CHUNK_NEVER: + if (flag & unknown) + errorx = "DISCARD: unknown chunk saved"; + break; + + case PNG_HANDLE_CHUNK_IF_SAFE: + if (ancillary(chunk_info[i].name)) + { + if (!(flag & unknown)) + errorx = "IF-SAFE: unknown ancillary chunk lost"; + } + + else if (flag & unknown) + errorx = "IF-SAFE: unknown critical chunk saved"; + break; + + case PNG_HANDLE_CHUNK_ALWAYS: + if (!(flag & unknown)) + errorx = "SAVE: unknown chunk lost"; + break; + + default: + errorx = "internal error: bad keep"; + break; + } + } /* unknown chunk */ + + else /* known chunk */ + { + type = "KNOWN"; + + if (flag & known) + { + /* chunk was processed, it won't have been saved because that is + * caught below when checking for inconsistent processing. + */ + if (keep != PNG_HANDLE_CHUNK_AS_DEFAULT) + errorx = "!DEFAULT: known chunk processed"; + } + + else /* not processed */ switch (keep) + { + case PNG_HANDLE_CHUNK_AS_DEFAULT: + errorx = "DEFAULT: known chunk not processed"; + break; + + case PNG_HANDLE_CHUNK_NEVER: + if (flag & unknown) + errorx = "DISCARD: known chunk saved"; + break; + + case PNG_HANDLE_CHUNK_IF_SAFE: + if (ancillary(chunk_info[i].name)) + { + if (!(flag & unknown)) + errorx = "IF-SAFE: known ancillary chunk lost"; + } + + else if (flag & unknown) + errorx = "IF-SAFE: known critical chunk saved"; + break; + + case PNG_HANDLE_CHUNK_ALWAYS: + if (!(flag & unknown)) + errorx = "SAVE: known chunk lost"; + break; + + default: + errorx = "internal error: bad keep (2)"; + break; + } + } + + if (errorx != NULL) + { + ++(d->error_count); + fprintf(stderr, "%s(%s): %s %s %s: %s\n", + d->file, d->test, type, chunk_info[i].name, position, errorx); + } + + chunks &= ~flag; + } +} + +static void +perform_one_test(FILE *fp, int argc, const char **argv, + png_uint_32 *default_flags, display *d) +{ + int def; + png_uint_32 flags[2][4]; + + rewind(fp); + clear_keep(); + memcpy(flags[0], default_flags, sizeof flags[0]); + + def = check(fp, argc, argv, flags[1], d); + + /* Chunks should either be known or unknown, never both and this should apply + * whether the chunk is before or after the IDAT (actually, the app can + * probably change this by swapping the handling after the image, but this + * test does not do that.) + */ + check_error(d, (flags[0][0]|flags[0][2]) & (flags[0][1]|flags[0][3]), + "chunk handled inconsistently in count tests"); + check_error(d, (flags[1][0]|flags[1][2]) & (flags[1][1]|flags[1][3]), + "chunk handled inconsistently in option tests"); + + /* Now find out what happened to each chunk before and after the IDAT and + * determine if the behavior was correct. First some basic sanity checks, + * any known chunk should be known in the original count, any unknown chunk + * should be either known or unknown in the original. + */ + { + png_uint_32 test; + + test = flags[1][0] & ~flags[0][0]; + check_error(d, test, "new known chunk before IDAT"); + test = flags[1][1] & ~(flags[0][0] | flags[0][1]); + check_error(d, test, "new unknown chunk before IDAT"); + test = flags[1][2] & ~flags[0][2]; + check_error(d, test, "new known chunk after IDAT"); + test = flags[1][3] & ~(flags[0][2] | flags[0][3]); + check_error(d, test, "new unknown chunk after IDAT"); + } + + /* Now each chunk in the original list should have been handled according to + * the options set for that chunk, regardless of whether libpng knows about + * it or not. + */ + check_handling(d, def, flags[0][0] | flags[0][1], flags[1][0], flags[1][1], + "before IDAT"); + check_handling(d, def, flags[0][2] | flags[0][3], flags[1][2], flags[1][3], + "after IDAT"); +} + +static void +perform_one_test_safe(FILE *fp, int argc, const char **argv, + png_uint_32 *default_flags, display *d, const char *test) +{ + if (setjmp(d->error_return) == 0) + { + d->test = test; /* allow use of d->error_return */ + perform_one_test(fp, argc, argv, default_flags, d); + d->test = init; /* prevent use of d->error_return */ + } +} + +static const char *standard_tests[] = +{ + "discard", "default=discard", 0, + "save", "default=save", 0, + "if-safe", "default=if-safe", 0, + "vpAg", "vpAg=if-safe", 0, + "sTER", "sTER=if-safe", 0, + "IDAT", "default=discard", "IDAT=save", 0, + "sAPI", "bKGD=save", "cHRM=save", "gAMA=save", "all=discard", "iCCP=save", + "sBIT=save", "sRGB=save", 0, + 0/*end*/ +}; + +static PNG_NORETURN void +usage(const char *program, const char *reason) +{ + fprintf(stderr, "pngunknown: %s: usage:\n %s [--strict] " + "--default|{(CHNK|default|all)=(default|discard|if-safe|save)} " + "testfile.png\n", reason, program); + exit(2); +} + +int +main(int argc, const char **argv) +{ + FILE *fp; + png_uint_32 default_flags[4/*valid,unknown{before,after}*/]; + int strict = 0, default_tests = 0; + const char *count_argv = "default=save"; + const char *touch_file = NULL; + display d; + + init_display(&d, argv[0]); + + while (++argv, --argc > 0) + { + if (strcmp(*argv, "--strict") == 0) + strict = 1; + + else if (strcmp(*argv, "--default") == 0) + default_tests = 1; + + else if (strcmp(*argv, "--touch") == 0) + { + if (argc > 1) + touch_file = *++argv, --argc; + + else + usage(d.program, "--touch: missing file name"); + } + + else + break; + } + + /* A file name is required, but there should be no other arguments if + * --default was specified. + */ + if (argc <= 0) + usage(d.program, "missing test file"); + + /* GCC BUG: if (default_tests && argc != 1) triggers some weird GCC argc + * optimization which causes warnings with -Wstrict-overflow! + */ + else if (default_tests) if (argc != 1) + usage(d.program, "extra arguments"); + +# ifndef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED + fprintf(stderr, "%s: warning: no 'save' support so arguments ignored\n", + d.program); +# endif + + /* The name of the test file is the last argument; remove it. */ + d.file = argv[--argc]; + + fp = fopen(d.file, "rb"); + if (fp == NULL) + { + perror(d.file); + exit(2); + } + + /* First find all the chunks, known and unknown, in the test file, a failure + * here aborts the whole test. + */ + if (check(fp, 1, &count_argv, default_flags, &d) != + PNG_HANDLE_CHUNK_ALWAYS) + { + fprintf(stderr, "%s: %s: internal error\n", d.program, d.file); + exit(3); + } + + /* Now find what the various supplied options cause to change: */ + if (!default_tests) + { + d.test = cmd; /* acts as a flag to say exit, do not longjmp */ + perform_one_test(fp, argc, argv, default_flags, &d); + d.test = init; + } + + else + { + const char **test = standard_tests; + + /* Set the exit_test pointer here so we can continue after a libpng error. + * NOTE: this leaks memory because the png_struct data from the failing + * test is never freed. + */ + while (*test) + { + const char *this_test = *test++; + const char **next = test; + int count = display_rc(&d, strict), new_count; + const char *result; + int arg_count = 0; + + while (*next) ++next, ++arg_count; + + perform_one_test_safe(fp, arg_count, test, default_flags, &d, + this_test); + + new_count = display_rc(&d, strict); + + if (new_count == count) + result = "PASS"; + + else + result = "FAIL"; + + printf("%s: %s %s\n", result, d.program, this_test); + + test = next+1; + } + } + + fclose(fp); + + if (display_rc(&d, strict) == 0) + { + /* Success, touch the success file if appropriate */ + if (touch_file != NULL) + { + FILE *fsuccess = fopen(touch_file, "wt"); + + if (fsuccess != NULL) + { + int err = 0; + fprintf(fsuccess, "PNG unknown tests succeeded\n"); + fflush(fsuccess); + err = ferror(fsuccess); + + if (fclose(fsuccess) || err) + { + fprintf(stderr, "%s: write failed\n", touch_file); + exit(1); + } + } + + else + { + fprintf(stderr, "%s: open failed\n", touch_file); + exit(1); + } + } + + return 0; + } + + return 1; +} + +#else +int +main(void) +{ + fprintf(stderr, + " test ignored because libpng was not built with unknown chunk support\n"); + return 0; +} +#endif diff -ru4NwbB libpng-1.5.13/contrib/libtests/pngvalid.c libpng-1.6.0beta32/contrib/libtests/pngvalid.c --- libpng-1.5.13/contrib/libtests/pngvalid.c 2012-08-10 19:25:31.536605000 -0500 +++ libpng-1.6.0beta32/contrib/libtests/pngvalid.c 2012-11-25 12:40:12.950114341 -0600 @@ -1,8 +1,8 @@ /* pngvalid.c - validate libpng by constructing then reading png files. * - * Last changed in libpng 1.5.8 [February 1, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 2012 Glenn Randers-Pehrson * Written by John Cunningham Bowler * * This code is released under the libpng license. @@ -23,10 +23,15 @@ #define _ISOC99_SOURCE 1 /* For floating point */ #define _GNU_SOURCE 1 /* For the floating point exception extension */ #include +#include -#ifdef HAVE_FEENABLEEXCEPT +#if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H) +# include +#endif + +#ifdef HAVE_FEENABLEEXCEPT /* from config.h, if included */ # include #endif /* Define the following to use this test against your installed libpng, rather @@ -37,8 +42,10 @@ #else # include "../../png.h" #endif +#ifdef PNG_WRITE_SUPPORTED /* else pngvalid can do nothing */ + #if PNG_LIBPNG_VER < 10500 /* This deliberately lacks the PNG_CONST. */ typedef png_byte *png_const_bytep; @@ -73,9 +80,16 @@ #define PNG_GAMMA_THRESHOLD_FIXED\ ((png_fixed_point)(PNG_GAMMA_THRESHOLD * PNG_FP_1)) #endif -#include "zlib.h" /* For crc32 */ +#if PNG_LIBPNG_VER < 10600 + /* 1.6.0 constifies many APIs, the following exists to allow pngvalid to be + * compiled against earlier versions. + */ +# define png_const_structp png_structp +#endif + +#include /* For crc32 */ #include /* For floating point constants */ #include /* For malloc */ #include /* For memcpy, memset */ @@ -92,9 +106,13 @@ # endif #endif /***************************** EXCEPTION HANDLING *****************************/ +#ifdef PNG_FREESTANDING_TESTS +# include +#else #include "../visupng/cexcept.h" +#endif #ifdef __cplusplus # define this not_the_cpp_this # define new not_the_cpp_new @@ -158,21 +176,24 @@ "grayscale", invalid, "truecolour", "indexed-colour", "grayscale with alpha", invalid, "truecolour with alpha", invalid }; +#ifdef PNG_READ_SUPPORTED /* Convert a double precision value to fixed point. */ static png_fixed_point fix(double d) { d = floor(d * PNG_FP_1 + .5); return (png_fixed_point)d; } +#endif /* PNG_READ_SUPPORTED */ /* Generate random bytes. This uses a boring repeatable algorithm and it * is implemented here so that it gives the same set of numbers on every * architecture. It's a linear congruential generator (Knuth or Sedgewick * "Algorithms") but it comes from the 'feedback taps' table in Horowitz and - * Hill, "The Art of Electronics". + * Hill, "The Art of Electronics" (Pseudo-Random Bit Sequences and Noise + * Generation.) */ static void make_random_bytes(png_uint_32* seed, void* pv, size_t size) { @@ -203,8 +224,9 @@ { make_random_bytes(seed, bytes, 4); } +#ifdef PNG_READ_SUPPORTED static void randomize(void *pv, size_t size) { static png_uint_32 random_seed[2] = {0x56789abc, 0xd}; @@ -222,8 +244,9 @@ return x % max; /* 0 .. max-1 */ } +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED static int random_choice(void) { unsigned char x; @@ -231,8 +254,10 @@ RANDOMIZE(x); return x & 1; } +#endif +#endif /* PNG_READ_SUPPORTED */ /* A numeric ID based on PNG file characteristics. The 'do_interlace' field * simply records whether pngvalid did the interlace itself or whether it * was done by libpng. Width and height must be less than 256. 'palette' is an @@ -449,8 +474,9 @@ else /* One or more bytes */ memmove(toBuffer+(toIndex>>3), fromBuffer+(fromIndex>>3), pixelSize>>3); } +#ifdef PNG_READ_SUPPORTED /* Copy a complete row of pixels, taking into account potential partial * bytes at the end. */ static void @@ -514,8 +540,9 @@ while (pa[where] == pb[where]) ++where; return 1+where; } } +#endif /* PNG_READ_SUPPORTED */ /*************************** BASIC PNG FILE WRITING ***************************/ /* A png_store takes data from the sequential writer or provides data * to the sequential reader. It can also store the result of a PNG @@ -624,8 +651,9 @@ make_four_random_bytes(store_seed, mark); } +#ifdef PNG_READ_SUPPORTED /* Use this for random 32 bit values; this function makes sure the result is * non-zero. */ static png_uint_32 @@ -643,8 +671,9 @@ if (result != 0) return result; } } +#endif /* PNG_READ_SUPPORTED */ static void store_pool_init(png_store *ps, store_pool *pool) { @@ -778,9 +807,9 @@ } /* Generate an error message (in the given buffer) */ static size_t -store_message(png_store *ps, png_structp pp, char *buffer, size_t bufsize, +store_message(png_store *ps, png_const_structp pp, char *buffer, size_t bufsize, size_t pos, PNG_CONST char *msg) { if (pp != NULL && pp == ps->pread) { @@ -818,9 +847,9 @@ } /* Verbose output to the error stream: */ static void -store_verbose(png_store *ps, png_structp pp, png_const_charp prefix, +store_verbose(png_store *ps, png_const_structp pp, png_const_charp prefix, png_const_charp message) { char buffer[512]; @@ -833,9 +862,10 @@ } /* Log an error or warning - the relevant count is always incremented. */ static void -store_log(png_store* ps, png_structp pp, png_const_charp message, int is_error) +store_log(png_store* ps, png_const_structp pp, png_const_charp message, + int is_error) { /* The warning is copied to the error buffer if there are no errors and it is * the first warning. The error is copied to the error buffer if it is the * first error (overwriting any prior warnings). @@ -847,8 +877,9 @@ if (ps->verbose) store_verbose(ps, pp, is_error ? "error: " : "warning: ", message); } +#ifdef PNG_READ_SUPPORTED /* Internal error function, called with a png_store but no libpng stuff. */ static void internal_error(png_store *ps, png_const_charp message) { @@ -859,13 +890,15 @@ struct exception_context *the_exception_context = &ps->exception_context; Throw ps; } } +#endif /* PNG_READ_SUPPORTED */ /* Functions to use as PNG callbacks. */ static void -store_error(png_structp pp, png_const_charp message) /* PNG_NORETURN */ +store_error(png_structp ppIn, png_const_charp message) /* PNG_NORETURN */ { + png_const_structp pp = ppIn; png_store *ps = voidcast(png_store*, png_get_error_ptr(pp)); if (!ps->expect_error) store_log(ps, pp, message, 1 /* error */); @@ -877,10 +910,11 @@ } } static void -store_warning(png_structp pp, png_const_charp message) +store_warning(png_structp ppIn, png_const_charp message) { + png_const_structp pp = ppIn; png_store *ps = voidcast(png_store*, png_get_error_ptr(pp)); if (!ps->expect_warning) store_log(ps, pp, message, 0 /* warning */); @@ -892,9 +926,9 @@ * the buffer is big enough, the png_structp is for errors. */ /* Return a single row from the correct image. */ static png_bytep -store_image_row(PNG_CONST png_store* ps, png_structp pp, int nImage, +store_image_row(PNG_CONST png_store* ps, png_const_structp pp, int nImage, png_uint_32 y) { png_size_t coffset = (nImage * ps->image_h + y) * (ps->cb_row + 5) + 2; @@ -907,9 +941,9 @@ return ps->image + coffset; } static void -store_image_free(png_store *ps, png_structp pp) +store_image_free(png_store *ps, png_const_structp pp) { if (ps->image != NULL) { png_bytep image = ps->image; @@ -929,10 +963,10 @@ } } static void -store_ensure_image(png_store *ps, png_structp pp, int nImages, png_size_t cbRow, - png_uint_32 cRows) +store_ensure_image(png_store *ps, png_const_structp pp, int nImages, + png_size_t cbRow, png_uint_32 cRows) { png_size_t cb = nImages * cRows * (cbRow + 5); if (ps->cb_image < cb) @@ -994,10 +1028,11 @@ } } } +#ifdef PNG_READ_SUPPORTED static void -store_image_check(PNG_CONST png_store* ps, png_structp pp, int iImage) +store_image_check(PNG_CONST png_store* ps, png_const_structp pp, int iImage) { png_const_bytep image = ps->image; if (image[-1] != 0xed || image[ps->cb_image] != 0xfe) @@ -1023,12 +1058,14 @@ image += cbRow+5; } } } +#endif /* PNG_READ_SUPPORTED */ static void -store_write(png_structp pp, png_bytep pb, png_size_t st) +store_write(png_structp ppIn, png_bytep pb, png_size_t st) { + png_const_structp pp = ppIn; png_store *ps = voidcast(png_store*, png_get_io_ptr(pp)); if (ps->pwrite != pp) png_error(pp, "store state damaged"); @@ -1052,13 +1089,14 @@ } } static void -store_flush(png_structp pp) +store_flush(png_structp ppIn) { - UNUSED(pp) /*DOES NOTHING*/ + UNUSED(ppIn) /*DOES NOTHING*/ } +#ifdef PNG_READ_SUPPORTED static size_t store_read_buffer_size(png_store *ps) { /* Return the bytes available for read in the current buffer. */ @@ -1145,10 +1183,11 @@ } } static void -store_read(png_structp pp, png_bytep pb, png_size_t st) +store_read(png_structp ppIn, png_bytep pb, png_size_t st) { + png_const_structp pp = ppIn; png_store *ps = voidcast(png_store*, png_get_io_ptr(pp)); if (ps == NULL || ps->pread != pp) png_error(pp, "bad store read call"); @@ -1173,8 +1212,9 @@ png_process_data(pp, pi, ps->next->buffer, store_read_buffer_size(ps)); } while (store_read_buffer_next(ps)); } +#endif /* PNG_READ_SUPPORTED */ /* The caller must fill this in: */ static store_palette_entry * store_write_palette(png_store *ps, int npalette) @@ -1199,8 +1239,9 @@ return ps->palette; } +#ifdef PNG_READ_SUPPORTED static store_palette_entry * store_current_palette(png_store *ps, int *npalette) { /* This is an internal error (the call has been made outside a read @@ -1212,8 +1253,9 @@ /* The result may be null if there is no palette. */ *npalette = ps->current->npalette; return ps->current->palette; } +#endif /* PNG_READ_SUPPORTED */ /***************************** MEMORY MANAGEMENT*** ***************************/ /* A store_memory is simply the header for an allocated block of memory. The * pointer returned to libpng is just after the end of the header block, the @@ -1234,9 +1276,9 @@ * struct has returned) will simply keep going and free (or attempt to free) * all the memory. */ static void -store_pool_error(png_store *ps, png_structp pp, PNG_CONST char *msg) +store_pool_error(png_store *ps, png_const_structp pp, PNG_CONST char *msg) { if (pp != NULL) png_error(pp, msg); @@ -1247,9 +1289,9 @@ store_log(ps, pp, msg, 1 /* error */); } static void -store_memory_free(png_structp pp, store_pool *pool, store_memory *memory) +store_memory_free(png_const_structp pp, store_pool *pool, store_memory *memory) { /* Note that pp may be NULL (see store_pool_delete below), the caller has * found 'memory' in pool->list *and* unlinked this entry, so this is a valid * pointer (for sure), but the contents may have been trashed. @@ -1333,10 +1375,11 @@ } /* The memory callbacks: */ static png_voidp -store_malloc(png_structp pp, png_alloc_size_t cb) +store_malloc(png_structp ppIn, png_alloc_size_t cb) { + png_const_structp pp = ppIn; store_pool *pool = voidcast(store_pool*, png_get_mem_ptr(pp)); store_memory *new = voidcast(store_memory*, malloc(cb + (sizeof *new) + (sizeof pool->mark))); @@ -1381,10 +1424,11 @@ return new; } static void -store_free(png_structp pp, png_voidp memory) +store_free(png_structp ppIn, png_voidp memory) { + png_const_structp pp = ppIn; store_pool *pool = voidcast(store_pool*, png_get_mem_ptr(pp)); store_memory *this = voidcast(store_memory*, memory), **test; /* Because libpng calls store_free with a dummy png_struct when deleting @@ -1484,12 +1528,15 @@ return ps->pwrite; } /* Cleanup when finished reading (either due to error or in the success case). + * This routine exists even when there is no read support to make the code + * tidier (avoid a mass of ifdefs) and so easier to maintain. */ static void store_read_reset(png_store *ps) { +# ifdef PNG_READ_SUPPORTED if (ps->pread != NULL) { anon_context(ps); @@ -1503,8 +1550,9 @@ ps->pread = NULL; ps->piread = NULL; } +# endif /* Always do this to be safe. */ store_pool_delete(ps, &ps->read_memory_pool); @@ -1513,8 +1561,9 @@ ps->readpos = 0; ps->validated = 0; } +#ifdef PNG_READ_SUPPORTED static void store_read_set(png_store *ps, png_uint_32 id) { png_store_file *pf = ps->saved; @@ -1590,8 +1639,9 @@ *ppi = ps->piread = png_create_info_struct(ps->pread); return ps->pread; } +#endif /* PNG_READ_SUPPORTED */ /* The overall cleanup of a store simply calls the above then removes all the * saved files. This does not delete the store itself. */ @@ -1629,20 +1679,8 @@ */ double X, Y, Z; } CIE_color; -static double -chromaticity_x(CIE_color c) -{ - return c.X / (c.X + c.Y + c.Z); -} - -static double -chromaticity_y(CIE_color c) -{ - return c.Y / (c.X + c.Y + c.Z); -} - typedef struct color_encoding { /* A description of an (R,G,B) encoding of color (as defined above); this * includes the actual colors of the (R,G,B) triples (1,0,0), (0,1,0) and @@ -1653,8 +1691,21 @@ double gamma; /* Encoding (file) gamma of space */ CIE_color red, green, blue; /* End points */ } color_encoding; +#ifdef PNG_READ_SUPPORTED +static double +chromaticity_x(CIE_color c) +{ + return c.X / (c.X + c.Y + c.Z); +} + +static double +chromaticity_y(CIE_color c) +{ + return c.Y / (c.X + c.Y + c.Z); +} + static CIE_color white_point(PNG_CONST color_encoding *encoding) { CIE_color white; @@ -1665,8 +1716,9 @@ return white; } +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED static void normalize_color_encoding(color_encoding *encoding) { PNG_CONST double whiteY = encoding->red.Y + encoding->green.Y + @@ -1684,8 +1736,9 @@ encoding->blue.Y /= whiteY; encoding->blue.Z /= whiteY; } } +#endif static size_t safecat_color_encoding(char *buffer, size_t bufsize, size_t pos, PNG_CONST color_encoding *e, double encoding_gamma) @@ -1724,8 +1777,9 @@ } return pos; } +#endif /* PNG_READ_SUPPORTED */ typedef struct png_modifier { png_store this; /* I am a png_store */ @@ -1917,8 +1971,9 @@ * bit precision. This only affects those of the following limits that pertain * to a calculation - not a digitization operation - unless the following API is * called directly. */ +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED static double digitize(PNG_CONST png_modifier *pm, double value, int sample_depth, int do_round) { /* 'value' is in the range 0 to 1, the result is the same value rounded to a @@ -1941,9 +1996,12 @@ value *= digitization_factor; if (do_round) value += .5; return floor(value)/digitization_factor; } +#endif +#if (defined PNG_READ_GAMMA_SUPPORTED) ||\ + (defined PNG_READ_RGB_TO_GRAY_SUPPORTED) static double abserr(PNG_CONST png_modifier *pm, int in_depth, int out_depth) { /* Absolute error permitted in linear values - affected by the bit depth of * the calculations. @@ -1953,9 +2011,11 @@ return pm->maxabs16; else return pm->maxabs8; } +#endif +#ifdef PNG_READ_GAMMA_SUPPORTED static double calcerr(PNG_CONST png_modifier *pm, int in_depth, int out_depth) { /* Error in the linear composition arithmetic - only relevant when * composition actually happens (0 < alpha < 1). @@ -2070,8 +2130,9 @@ return 257; else return 1; } +#endif /* PNG_READ_GAMMA_SUPPORTED */ /* One modification structure must be provided for each chunk to be modified (in * fact more than one can be provided if multiple separate changes are desired * for a single chunk.) Modifications include adding a new chunk when a @@ -2122,8 +2183,9 @@ pmm->add = 0; modification_reset(pmm); } +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED static void modifier_current_encoding(PNG_CONST png_modifier *pm, color_encoding *ce) { if (pm->current_encoding != 0) @@ -2133,8 +2195,9 @@ memset(ce, 0, sizeof *ce); ce->gamma = pm->current_gamma; } +#endif static size_t safecat_current_encoding(char *buffer, size_t bufsize, size_t pos, PNG_CONST png_modifier *pm) @@ -2536,10 +2599,11 @@ } /* The callback: */ static void -modifier_read(png_structp pp, png_bytep pb, png_size_t st) +modifier_read(png_structp ppIn, png_bytep pb, png_size_t st) { + png_const_structp pp = ppIn; png_modifier *pm = voidcast(png_modifier*, png_get_io_ptr(pp)); if (pm == NULL || pm->this.pread != pp) png_error(pp, "bad modifier_read call"); @@ -2757,8 +2821,9 @@ me->this.next = pm->modifications; pm->modifications = &me->this; } +#ifdef PNG_READ_GAMMA_SUPPORTED typedef struct sbit_modification { png_modification this; png_byte sbit; @@ -2823,8 +2888,9 @@ me->sbit = sbit; me->this.next = pm->modifications; pm->modifications = &me->this; } +#endif /* PNG_READ_GAMMA_SUPPORTED */ #endif /* PNG_READ_TRANSFORMS_SUPPORTED */ /***************************** STANDARD PNG FILES *****************************/ /* Standard files - write and save standard files. */ @@ -2884,11 +2950,11 @@ /* Always put in black and white plus the six primary and secondary colors. */ for (; i<8; ++i) { - values[i][1] = (i&1) ? 255 : 0; - values[i][2] = (i&2) ? 255 : 0; - values[i][3] = (i&4) ? 255 : 0; + values[i][1] = (png_byte)((i&1) ? 255U : 0U); + values[i][2] = (png_byte)((i&2) ? 255U : 0U); + values[i][3] = (png_byte)((i&4) ? 255U : 0U); } /* Then add 62 grays (one quarter of the remaining 256 slots). */ { @@ -2970,8 +3036,9 @@ /* Initialize a standard palette on a write stream. The 'do_tRNS' argument * indicates whether or not to also set the tRNS chunk. */ +/* TODO: the png_structp here can probably be 'const' in the future */ static void init_standard_palette(png_store *ps, png_structp pp, png_infop pi, int npalette, int do_tRNS) { @@ -3018,9 +3085,9 @@ /* The number of passes is related to the interlace type. There was no libpng * API to determine this prior to 1.5, so we need an inquiry function: */ static int -npasses_from_interlace_type(png_structp pp, int interlace_type) +npasses_from_interlace_type(png_const_structp pp, int interlace_type) { switch (interlace_type) { default: @@ -3034,9 +3101,9 @@ } } static unsigned int -bit_size(png_structp pp, png_byte colour_type, png_byte bit_depth) +bit_size(png_const_structp pp, png_byte colour_type, png_byte bit_depth) { switch (colour_type) { default: png_error(pp, "invalid color type"); @@ -3059,9 +3126,10 @@ #define STANDARD_ROWMAX TRANSFORM_ROWMAX /* The larger of the two */ #define SIZE_HEIGHTMAX 16 /* Maximum range of size images */ static size_t -transform_rowsize(png_structp pp, png_byte colour_type, png_byte bit_depth) +transform_rowsize(png_const_structp pp, png_byte colour_type, + png_byte bit_depth) { return (TRANSFORM_WIDTH * bit_size(pp, colour_type, bit_depth)) / 8; } @@ -3070,9 +3138,9 @@ */ #define transform_width(pp, colour_type, bit_depth) TRANSFORM_WIDTH static png_uint_32 -transform_height(png_structp pp, png_byte colour_type, png_byte bit_depth) +transform_height(png_const_structp pp, png_byte colour_type, png_byte bit_depth) { switch (bit_size(pp, colour_type, bit_depth)) { case 1: @@ -3099,13 +3167,14 @@ return 0; /* Error, will be caught later */ } } +#ifdef PNG_READ_SUPPORTED /* The following can only be defined here, now we have the definitions * of the transform image sizes. */ static png_uint_32 -standard_width(png_structp pp, png_uint_32 id) +standard_width(png_const_structp pp, png_uint_32 id) { png_uint_32 width = WIDTH_FROM_ID(id); UNUSED(pp) @@ -3115,9 +3184,9 @@ return width; } static png_uint_32 -standard_height(png_structp pp, png_uint_32 id) +standard_height(png_const_structp pp, png_uint_32 id) { png_uint_32 height = HEIGHT_FROM_ID(id); if (height == 0) @@ -3126,60 +3195,66 @@ return height; } static png_uint_32 -standard_rowsize(png_structp pp, png_uint_32 id) +standard_rowsize(png_const_structp pp, png_uint_32 id) { png_uint_32 width = standard_width(pp, id); /* This won't overflow: */ width *= bit_size(pp, COL_FROM_ID(id), DEPTH_FROM_ID(id)); return (width + 7) / 8; } +#endif /* PNG_READ_SUPPORTED */ static void -transform_row(png_structp pp, png_byte buffer[TRANSFORM_ROWMAX], +transform_row(png_const_structp pp, png_byte buffer[TRANSFORM_ROWMAX], png_byte colour_type, png_byte bit_depth, png_uint_32 y) { png_uint_32 v = y << 7; png_uint_32 i = 0; switch (bit_size(pp, colour_type, bit_depth)) { case 1: - while (i<128/8) buffer[i] = v & 0xff, v += 17, ++i; + while (i<128/8) buffer[i] = (png_byte)(v & 0xff), v += 17, ++i; return; case 2: - while (i<128/4) buffer[i] = v & 0xff, v += 33, ++i; + while (i<128/4) buffer[i] = (png_byte)(v & 0xff), v += 33, ++i; return; case 4: - while (i<128/2) buffer[i] = v & 0xff, v += 65, ++i; + while (i<128/2) buffer[i] = (png_byte)(v & 0xff), v += 65, ++i; return; case 8: /* 256 bytes total, 128 bytes in each row set as follows: */ - while (i<128) buffer[i] = v & 0xff, ++v, ++i; + while (i<128) buffer[i] = (png_byte)(v & 0xff), ++v, ++i; return; case 16: /* Generate all 65536 pixel values in order, which includes the 8 bit * GA case as well as the 16 bit G case. */ while (i<128) - buffer[2*i] = (v>>8) & 0xff, buffer[2*i+1] = v & 0xff, ++v, ++i; + { + buffer[2*i] = (png_byte)((v>>8) & 0xff); + buffer[2*i+1] = (png_byte)(v & 0xff); + ++v; + ++i; + } return; case 24: /* 65535 pixels, but rotate the values. */ while (i<128) { /* Three bytes per pixel, r, g, b, make b by r^g */ - buffer[3*i+0] = (v >> 8) & 0xff; - buffer[3*i+1] = v & 0xff; - buffer[3*i+2] = ((v >> 8) ^ v) & 0xff; + buffer[3*i+0] = (png_byte)((v >> 8) & 0xff); + buffer[3*i+1] = (png_byte)(v & 0xff); + buffer[3*i+2] = (png_byte)(((v >> 8) ^ v) & 0xff); ++v; ++i; } @@ -3188,12 +3263,12 @@ case 32: /* 65535 pixels, r, g, b, a; just replicate */ while (i<128) { - buffer[4*i+0] = (v >> 8) & 0xff; - buffer[4*i+1] = v & 0xff; - buffer[4*i+2] = (v >> 8) & 0xff; - buffer[4*i+3] = v & 0xff; + buffer[4*i+0] = (png_byte)((v >> 8) & 0xff); + buffer[4*i+1] = (png_byte)(v & 0xff); + buffer[4*i+2] = (png_byte)((v >> 8) & 0xff); + buffer[4*i+3] = (png_byte)(v & 0xff); ++v; ++i; } @@ -3205,16 +3280,16 @@ */ while (i<128) { png_uint_32 t = v++; - buffer[6*i+0] = (t >> 8) & 0xff; - buffer[6*i+1] = t & 0xff; + buffer[6*i+0] = (png_byte)((t >> 8) & 0xff); + buffer[6*i+1] = (png_byte)(t & 0xff); t *= 257; - buffer[6*i+2] = (t >> 8) & 0xff; - buffer[6*i+3] = t & 0xff; + buffer[6*i+2] = (png_byte)((t >> 8) & 0xff); + buffer[6*i+3] = (png_byte)(t & 0xff); t *= 17; - buffer[6*i+4] = (t >> 8) & 0xff; - buffer[6*i+5] = t & 0xff; + buffer[6*i+4] = (png_byte)((t >> 8) & 0xff); + buffer[6*i+5] = (png_byte)(t & 0xff); ++i; } return; @@ -3223,17 +3298,17 @@ /* As above in the 32 bit case. */ while (i<128) { png_uint_32 t = v++; - buffer[8*i+0] = (t >> 8) & 0xff; - buffer[8*i+1] = t & 0xff; - buffer[8*i+4] = (t >> 8) & 0xff; - buffer[8*i+5] = t & 0xff; + buffer[8*i+0] = (png_byte)((t >> 8) & 0xff); + buffer[8*i+1] = (png_byte)(t & 0xff); + buffer[8*i+4] = (png_byte)((t >> 8) & 0xff); + buffer[8*i+5] = (png_byte)(t & 0xff); t *= 257; - buffer[8*i+2] = (t >> 8) & 0xff; - buffer[8*i+3] = t & 0xff; - buffer[8*i+6] = (t >> 8) & 0xff; - buffer[8*i+7] = t & 0xff; + buffer[8*i+2] = (png_byte)((t >> 8) & 0xff); + buffer[8*i+3] = (png_byte)(t & 0xff); + buffer[8*i+6] = (png_byte)((t >> 8) & 0xff); + buffer[8*i+7] = (png_byte)(t & 0xff); ++i; } return; @@ -3281,8 +3356,13 @@ bit_depth, colour_type, interlace_type, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); #ifdef PNG_TEXT_SUPPORTED +# if (defined PNG_READ_zTXt_SUPPORTED) && (defined PNG_WRITE_zTXt_SUPPORTED) +# define TEXT_COMPRESSION PNG_TEXT_COMPRESSION_zTXt +# else +# define TEXT_COMPRESSION PNG_TEXT_COMPRESSION_NONE +# endif { static char key[] = "image name"; /* must be writeable */ size_t pos; png_text text; @@ -3290,9 +3370,9 @@ /* Use a compressed text string to test the correct interaction of text * compression and IDAT compression. */ - text.compression = PNG_TEXT_COMPRESSION_zTXt; + text.compression = TEXT_COMPRESSION; text.key = key; /* Yuck: the text must be writable! */ pos = safecat(copy, sizeof copy, 0, ps->wname); text.text = copy; @@ -3348,9 +3428,9 @@ /* Use a compressed text string to test the correct interaction of text * compression and IDAT compression. */ - text.compression = PNG_TEXT_COMPRESSION_zTXt; + text.compression = TEXT_COMPRESSION; text.key = key; text.text = comment; text.text_length = (sizeof comment)-1; text.itxt_length = 0; @@ -3432,8 +3512,9 @@ ++xout; } } +#ifdef PNG_READ_SUPPORTED static void deinterlace_row(png_bytep buffer, png_const_bytep row, unsigned int pixel_size, png_uint_32 w, int pass) { @@ -3452,8 +3533,9 @@ pixel_copy(buffer, xout, row, xin, pixel_size); ++xin; } } +#endif /* PNG_READ_SUPPORTED */ /* Build a single row for the 'size' test images; this fills in only the * first bit_width bits of the sample row. */ @@ -3509,8 +3591,32 @@ png_set_IHDR(pp, pi, w, h, bit_depth, colour_type, interlace_type, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); +#ifdef PNG_TEXT_SUPPORTED + { + static char key[] = "image name"; /* must be writeable */ + size_t pos; + png_text text; + char copy[FILE_NAME_SIZE]; + + /* Use a compressed text string to test the correct interaction of text + * compression and IDAT compression. + */ + text.compression = TEXT_COMPRESSION; + text.key = key; + /* Yuck: the text must be writable! */ + pos = safecat(copy, sizeof copy, 0, ps->wname); + text.text = copy; + text.text_length = pos; + text.itxt_length = 0; + text.lang = 0; + text.lang_key = 0; + + png_set_text(pp, pi, &text, 1); + } +#endif + if (colour_type == 3) /* palette */ init_standard_palette(ps, pp, pi, 1U << bit_depth, 0/*do tRNS*/); png_write_info(pp, pi); @@ -3586,8 +3692,29 @@ } } } +#ifdef PNG_TEXT_SUPPORTED + { + static char key[] = "end marker"; + static char comment[] = "end"; + png_text text; + + /* Use a compressed text string to test the correct interaction of text + * compression and IDAT compression. + */ + text.compression = TEXT_COMPRESSION; + text.key = key; + text.text = comment; + text.text_length = (sizeof comment)-1; + text.itxt_length = 0; + text.lang = 0; + text.lang_key = 0; + + png_set_text(pp, pi, &text, 1); + } +#endif + png_write_end(pp, pi); /* And store this under the appropriate id, then clean up. */ store_storefile(ps, id); @@ -3650,25 +3777,30 @@ make_size(ps, 4, 3, WRITE_BDHI); make_size(ps, 6, 3, WRITE_BDHI); } +#ifdef PNG_READ_SUPPORTED /* Return a row based on image id and 'y' for checking: */ static void -standard_row(png_structp pp, png_byte std[STANDARD_ROWMAX], png_uint_32 id, - png_uint_32 y) +standard_row(png_const_structp pp, png_byte std[STANDARD_ROWMAX], + png_uint_32 id, png_uint_32 y) { if (WIDTH_FROM_ID(id) == 0) transform_row(pp, std, COL_FROM_ID(id), DEPTH_FROM_ID(id), y); else size_row(std, WIDTH_FROM_ID(id) * bit_size(pp, COL_FROM_ID(id), DEPTH_FROM_ID(id)), y); } +#endif /* PNG_READ_SUPPORTED */ /* Tests - individual test cases */ /* Like 'make_standard' but errors are deliberately introduced into the calls * to ensure that they get detected - it should not be possible to write an * invalid image with libpng! */ +/* TODO: the 'set' functions can probably all be made to take a + * png_const_structp rather than a modifiable one. + */ #ifdef PNG_WARNINGS_SUPPORTED static void sBIT0_error_fn(png_structp pp, png_infop pi) { @@ -3883,8 +4015,11 @@ Try { png_const_charp correct = "29 Aug 2079 13:53:60 +0000"; png_const_charp result; +# if PNG_LIBPNG_VER >= 10600 + char timestring[29]; +# endif png_structp pp; png_time pt; pp = set_store_for_write(ps, NULL, "libpng formatting test"); @@ -3900,9 +4035,17 @@ pt.hour = 13; pt.minute = 53; pt.second = 60; /* a leap second */ +# if PNG_LIBPNG_VER < 10600 result = png_convert_to_rfc1123(pp, &pt); +# else + if (png_convert_to_rfc1123_buffer(timestring, &pt)) + result = timestring; + + else + result = NULL; +# endif if (result == NULL) png_error(pp, "png_convert_to_rfc1123 failed"); @@ -3931,8 +4074,9 @@ UNUSED(ps) #endif } +#ifdef PNG_READ_SUPPORTED /* Because we want to use the same code in both the progressive reader and the * sequential reader it is necessary to deal with the fact that the progressive * reader callbacks only have one parameter (png_get_progressive_ptr()), so this * must contain all the test parameters and all the local variables directly @@ -4059,9 +4203,10 @@ * store_palette format. This returns 1 if there is any transparency in the * palette (it does not check for a transparent colour in the non-palette case.) */ static int -read_palette(store_palette palette, int *npalette, png_structp pp, png_infop pi) +read_palette(store_palette palette, int *npalette, png_const_structp pp, + png_infop pi) { png_colorp pal; png_bytep trans_alpha; int num; @@ -4150,9 +4295,10 @@ /* Utility to validate the palette if it should not have changed (the * non-transform case). */ static void -standard_palette_validate(standard_display *dp, png_structp pp, png_infop pi) +standard_palette_validate(standard_display *dp, png_const_structp pp, + png_infop pi) { int npalette; store_palette palette; @@ -4344,10 +4490,10 @@ * 'rowbytes' value, otherwise png_get_rowbytes will refer to the untransformed * image. */ static void -standard_info_part2(standard_display *dp, png_structp pp, png_infop pi, - int nImages) +standard_info_part2(standard_display *dp, png_const_structp pp, + png_const_infop pi, int nImages) { /* Record cbRow now that it can be found. */ dp->pixel_size = bit_size(pp, png_get_color_type(pp, pi), png_get_bit_depth(pp, pi)); @@ -4403,10 +4549,11 @@ standard_info_imp(dp, pp, pi, 1 /*only one image*/); } static void -progressive_row(png_structp pp, png_bytep new_row, png_uint_32 y, int pass) +progressive_row(png_structp ppIn, png_bytep new_row, png_uint_32 y, int pass) { + png_const_structp pp = ppIn; PNG_CONST standard_display *dp = voidcast(standard_display*, png_get_progressive_ptr(pp)); /* When handling interlacing some rows will be absent in each pass, the @@ -4522,10 +4669,118 @@ */ png_read_end(pp, pi); } +#ifdef PNG_TEXT_SUPPORTED +static void +standard_check_text(png_const_structp pp, png_const_textp tp, + png_const_charp keyword, png_const_charp text) +{ + char msg[1024]; + size_t pos = safecat(msg, sizeof msg, 0, "text: "); + size_t ok; + + pos = safecat(msg, sizeof msg, pos, keyword); + pos = safecat(msg, sizeof msg, pos, ": "); + ok = pos; + + if (tp->compression != TEXT_COMPRESSION) + { + char buf[64]; + + sprintf(buf, "compression [%d->%d], ", TEXT_COMPRESSION, + tp->compression); + pos = safecat(msg, sizeof msg, pos, buf); + } + + if (tp->key == NULL || strcmp(tp->key, keyword) != 0) + { + pos = safecat(msg, sizeof msg, pos, "keyword \""); + if (tp->key != NULL) + { + pos = safecat(msg, sizeof msg, pos, tp->key); + pos = safecat(msg, sizeof msg, pos, "\", "); + } + + else + pos = safecat(msg, sizeof msg, pos, "null, "); + } + + if (tp->text == NULL) + pos = safecat(msg, sizeof msg, pos, "text lost, "); + + else + { + if (tp->text_length != strlen(text)) + { + char buf[64]; + sprintf(buf, "text length changed[%lu->%lu], ", + (unsigned long)strlen(text), (unsigned long)tp->text_length); + pos = safecat(msg, sizeof msg, pos, buf); + } + + if (strcmp(tp->text, text) != 0) + { + pos = safecat(msg, sizeof msg, pos, "text becomes \""); + pos = safecat(msg, sizeof msg, pos, tp->text); + pos = safecat(msg, sizeof msg, pos, "\" (was \""); + pos = safecat(msg, sizeof msg, pos, text); + pos = safecat(msg, sizeof msg, pos, "\"), "); + } + } + + if (tp->itxt_length != 0) + pos = safecat(msg, sizeof msg, pos, "iTXt length set, "); + + if (tp->lang != NULL) + { + pos = safecat(msg, sizeof msg, pos, "iTXt language \""); + pos = safecat(msg, sizeof msg, pos, tp->lang); + pos = safecat(msg, sizeof msg, pos, "\", "); + } + + if (tp->lang_key != NULL) + { + pos = safecat(msg, sizeof msg, pos, "iTXt keyword \""); + pos = safecat(msg, sizeof msg, pos, tp->lang_key); + pos = safecat(msg, sizeof msg, pos, "\", "); + } + + if (pos > ok) + { + msg[pos-2] = '\0'; /* Remove the ", " at the end */ + png_error(pp, msg); + } +} + +static void +standard_text_validate(standard_display *dp, png_const_structp pp, + png_const_infop pi) +{ + png_textp tp = NULL; + png_uint_32 num_text = png_get_text(pp, pi, &tp, NULL); + + if (num_text == 2 && tp != NULL) + { + standard_check_text(pp, tp, "image name", dp->ps->current->name); + standard_check_text(pp, tp+1, "end marker", "end"); + } + + else + { + char msg[64]; + + sprintf(msg, "expected two text items, got %lu", + (unsigned long)num_text); + png_error(pp, msg); + } +} +#else +# define standard_text_validate(dp,pp,pi) ((void)0) +#endif + static void -standard_row_validate(standard_display *dp, png_structp pp, +standard_row_validate(standard_display *dp, png_const_structp pp, int iImage, int iDisplay, png_uint_32 y) { int where; png_byte std[STANDARD_ROWMAX]; @@ -4553,10 +4808,10 @@ (where = pixel_cmp(std, store_image_row(dp->ps, pp, iImage, y), dp->bit_width)) != 0) { char msg[64]; - sprintf(msg, "PNG image row[%d][%d] changed from %.2x to %.2x", y, - where-1, std[where-1], + sprintf(msg, "PNG image row[%lu][%d] changed from %.2x to %.2x", + (unsigned long)y, where-1, std[where-1], store_image_row(dp->ps, pp, iImage, y)[where-1]); png_error(pp, msg); } @@ -4571,17 +4826,17 @@ (where = pixel_cmp(std, store_image_row(dp->ps, pp, iDisplay, y), dp->bit_width)) != 0) { char msg[64]; - sprintf(msg, "display row[%d][%d] changed from %.2x to %.2x", y, - where-1, std[where-1], + sprintf(msg, "display row[%lu][%d] changed from %.2x to %.2x", + (unsigned long)y, where-1, std[where-1], store_image_row(dp->ps, pp, iDisplay, y)[where-1]); png_error(pp, msg); } } static void -standard_image_validate(standard_display *dp, png_structp pp, int iImage, +standard_image_validate(standard_display *dp, png_const_structp pp, int iImage, int iDisplay) { png_uint_32 y; @@ -4598,18 +4853,20 @@ dp->ps->validated = 1; } static void -standard_end(png_structp pp, png_infop pi) +standard_end(png_structp ppIn, png_infop pi) { + png_const_structp pp = ppIn; standard_display *dp = voidcast(standard_display*, png_get_progressive_ptr(pp)); UNUSED(pi) /* Validate the image - progressive reading only produces one variant for * interlaced images. */ + standard_text_validate(dp, pp, pi); standard_image_validate(dp, pp, 0, -1); } /* A single test run checking the standard image to ensure it is not damaged. */ @@ -4677,9 +4934,12 @@ /* After the last pass loop over the rows again to check that the * image is correct. */ if (!d.speed) + { + standard_text_validate(&d, pp, pi); standard_image_validate(&d, pp, 0, 1); + } else d.ps->validated = 1; } } @@ -5106,9 +5366,9 @@ * in the libpng implementation!) The png_structp is solely to allow error * reporting via png_error and png_warning. */ void (*mod)(PNG_CONST struct image_transform *this, image_pixel *that, - png_structp pp, PNG_CONST struct transform_display *display); + png_const_structp pp, PNG_CONST struct transform_display *display); /* Add this transform to the list and return true if the transform is * meaningful for this colour type and bit depth - if false then the * transform should have no effect on the image so there's not a lot of @@ -5201,9 +5461,9 @@ } static void image_transform_mod_end(PNG_CONST image_transform *this, image_pixel *that, - png_structp pp, PNG_CONST transform_display *display) + png_const_structp pp, PNG_CONST transform_display *display) { PNG_CONST unsigned int scale = (1U<sample_depth)-1; UNUSED(this) @@ -5430,9 +5690,9 @@ pp, pi); } static void -transform_range_check(png_structp pp, unsigned int r, unsigned int g, +transform_range_check(png_const_structp pp, unsigned int r, unsigned int g, unsigned int b, unsigned int a, unsigned int in_digitized, double in, unsigned int out, png_byte sample_depth, double err, double limit, PNG_CONST char *name, double digitization_error) { @@ -5473,9 +5733,10 @@ } } static void -transform_image_validate(transform_display *dp, png_structp pp, png_infop pi) +transform_image_validate(transform_display *dp, png_const_structp pp, + png_infop pi) { /* Constants for the loop below: */ PNG_CONST png_store* PNG_CONST ps = dp->this.ps; PNG_CONST png_byte in_ct = dp->this.colour_type; @@ -5631,10 +5892,11 @@ dp->this.ps->validated = 1; } static void -transform_end(png_structp pp, png_infop pi) +transform_end(png_structp ppIn, png_infop pi) { + png_const_structp pp = ppIn; transform_display *dp = voidcast(transform_display*, png_get_progressive_ptr(pp)); if (!dp->this.speed) @@ -5753,8 +6015,9 @@ { this->next->ini(this->next, that); } +#ifdef PNG_READ_BACKGROUND_SUPPORTED static int image_transform_default_add(image_transform *this, PNG_CONST image_transform **that, png_byte colour_type, png_byte bit_depth) { @@ -5765,8 +6028,9 @@ *that = this; return 1; } +#endif #ifdef PNG_READ_EXPAND_SUPPORTED /* png_set_palette_to_rgb */ static void @@ -5778,9 +6042,10 @@ } static void image_transform_png_set_palette_to_rgb_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { if (that->colour_type == PNG_COLOR_TYPE_PALETTE) image_pixel_convert_PLTE(that); @@ -5815,9 +6080,10 @@ } static void image_transform_png_set_tRNS_to_alpha_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { /* LIBPNG BUG: this always forces palette images to RGB. */ if (that->colour_type == PNG_COLOR_TYPE_PALETTE) image_pixel_convert_PLTE(that); @@ -5872,9 +6138,10 @@ } static void image_transform_png_set_gray_to_rgb_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { /* NOTE: we can actually pend the tRNS processing at this point because we * can correctly recognize the original pixel value even though we have * mapped the one gray channel to the three RGB ones, but in fact libpng @@ -5930,9 +6197,10 @@ } static void image_transform_png_set_expand_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { /* The general expand case depends on what the colour type is: */ if (that->colour_type == PNG_COLOR_TYPE_PALETTE) image_pixel_convert_PLTE(that); @@ -5979,9 +6247,9 @@ } static void image_transform_png_set_expand_gray_1_2_4_to_8_mod( - PNG_CONST image_transform *this, image_pixel *that, png_structp pp, + PNG_CONST image_transform *this, image_pixel *that, png_const_structp pp, PNG_CONST transform_display *display) { image_transform_png_set_expand_mod(this, that, pp, display); } @@ -6010,9 +6278,10 @@ } static void image_transform_png_set_expand_16_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { /* Expect expand_16 to expand everything to 16 bits as a result of also * causing 'expand' to happen. */ @@ -6057,9 +6326,10 @@ } static void image_transform_png_set_scale_16_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { if (that->bit_depth == 16) { that->sample_depth = that->bit_depth = 8; @@ -6100,9 +6370,10 @@ } static void image_transform_png_set_strip_16_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { if (that->bit_depth == 16) { that->sample_depth = that->bit_depth = 8; @@ -6166,9 +6437,10 @@ } static void image_transform_png_set_strip_alpha_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { if (that->colour_type == PNG_COLOR_TYPE_GRAY_ALPHA) that->colour_type = PNG_COLOR_TYPE_GRAY; else if (that->colour_type == PNG_COLOR_TYPE_RGB_ALPHA) @@ -6498,9 +6770,10 @@ } static void image_transform_png_set_rgb_to_gray_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { if ((that->colour_type & PNG_COLOR_MASK_COLOR) != 0) { double gray, err; @@ -6749,9 +7022,10 @@ } static void image_transform_png_set_background_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { /* Check for tRNS first: */ if (that->have_tRNS && that->colour_type != PNG_COLOR_TYPE_PALETTE) image_pixel_add_alpha(that, &display->this); @@ -6999,9 +7273,10 @@ } static void image_transform_png_set_@_mod(PNG_CONST image_transform *this, - image_pixel *that, png_structp pp, PNG_CONST transform_display *display) + image_pixel *that, png_const_structp pp, + PNG_CONST transform_display *display) { this->next->mod(this->next, that, pp, display); } @@ -7302,9 +7577,9 @@ * information required to validate the values. */ typedef struct validate_info { - png_structp pp; + png_const_structp pp; gamma_display *dp; png_byte sbit; int use_input_precision; int do_background; @@ -7332,9 +7607,9 @@ } validate_info; static void -init_validate_info(validate_info *vi, gamma_display *dp, png_struct *pp, +init_validate_info(validate_info *vi, gamma_display *dp, png_const_structp pp, int in_depth, int out_depth) { PNG_CONST unsigned int outmax = (1U<= 0 && alpha < 1); /*FALL THROUGH*/ +# endif # ifdef PNG_READ_ALPHA_MODE_SUPPORTED case ALPHA_MODE_OFFSET + PNG_ALPHA_STANDARD: case ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN: case ALPHA_MODE_OFFSET + PNG_ALPHA_OPTIMIZED: @@ -8045,9 +8327,10 @@ return i; } static void -gamma_image_validate(gamma_display *dp, png_structp pp, png_infop pi) +gamma_image_validate(gamma_display *dp, png_const_structp pp, + png_infop pi) { /* Get some constants derived from the input and output file formats: */ PNG_CONST png_store* PNG_CONST ps = dp->this.ps; PNG_CONST png_byte in_ct = dp->this.colour_type; @@ -8224,9 +8507,10 @@ { char msg[64]; /* No transform is expected on the threshold tests. */ - sprintf(msg, "gamma: below threshold row %d changed", y); + sprintf(msg, "gamma: below threshold row %lu changed", + (unsigned long)y); png_error(pp, msg); } } /* row (y) loop */ @@ -8234,10 +8518,11 @@ dp->this.ps->validated = 1; } static void -gamma_end(png_structp pp, png_infop pi) +gamma_end(png_structp ppIn, png_infop pi) { + png_const_structp pp = ppIn; gamma_display *dp = voidcast(gamma_display*, png_get_progressive_ptr(pp)); if (!dp->this.speed) gamma_image_validate(dp, pp, pi); @@ -8800,9 +9085,11 @@ /*TODO: remove this*/ /* Save certain values for the temporary overrides below. */ unsigned int calculations_use_input_precision = pm->calculations_use_input_precision; +# ifdef PNG_READ_BACKGROUND_SUPPORTED double maxout8 = pm->maxout8; +# endif /* First some arbitrary no-transform tests: */ if (!pm->this.speed && pm->test_gamma_threshold) { @@ -8919,8 +9206,9 @@ } #endif } #endif /* PNG_READ_GAMMA_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED */ /* INTERLACE MACRO VALIDATION */ /* This is copied verbatim from the specification, it is simply the pass * number in which each pixel in each 8x8 tile appears. The array must @@ -9368,9 +9656,9 @@ exit(1); } /* main program */ -int main(int argc, PNG_CONST char **argv) +int main(int argc, char **argv) { volatile int summary = 1; /* Print the error summary at the end */ volatile int memstats = 0; /* Print memory statistics at the end */ @@ -9727,17 +10015,21 @@ if (pm.test_standard) { perform_interlace_macro_validation(); perform_formatting_test(&pm.this); +# ifdef PNG_READ_SUPPORTED perform_standard_test(&pm); +# endif perform_error_test(&pm); } /* Various oddly sized images: */ if (pm.test_size) { make_size_images(&pm.this); +# ifdef PNG_READ_SUPPORTED perform_size_test(&pm); +# endif } #ifdef PNG_READ_TRANSFORMS_SUPPORTED /* Combinatorial transforms: */ @@ -9828,8 +10120,21 @@ fprintf(stderr, "%s: write failed\n", touch); exit(1); } } + + else + { + fprintf(stderr, "%s: open failed\n", touch); + exit(1); + } } return 0; } +#else /* write not supported */ +int main(void) +{ + fprintf(stderr, "pngvalid: no write support in libpng, all tests skipped\n"); + return 0; +} +#endif diff -ru4NwbB libpng-1.5.13/contrib/libtests/tarith.c libpng-1.6.0beta32/contrib/libtests/tarith.c --- libpng-1.5.13/contrib/libtests/tarith.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/tarith.c 2012-11-25 12:40:12.966544720 -0600 @@ -0,0 +1,999 @@ + +/* tarith.c + * + * Copyright (c) 2011,2012 John Cunningham Bowler + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * Test internal arithmetic functions of libpng. + * + * This code must be linked against a math library (-lm), but does not require + * libpng or zlib to work. Because it includes the complete source of 'png.c' + * it tests the code with whatever compiler options are used to build it. + * Changing these options can substantially change the errors in the + * calculations that the compiler chooses! + */ +#define _POSIX_SOURCE 1 +#define _ISOC99_SOURCE 1 + +/* Obtain a copy of the code to be tested (plus other things), disabling + * stuff that is not required. + */ +#include +#include +#include +#include +#include + +#include "../../pngpriv.h" + +#define png_error png_warning + +void png_warning(png_const_structrp png_ptr, png_const_charp msg) +{ + fprintf(stderr, "validation: %s\n", msg); +} + +#define png_fixed_error png_fixed_warning + +void png_fixed_warning(png_const_structrp png_ptr, png_const_charp msg) +{ + fprintf(stderr, "overflow in: %s\n", msg); +} + +#define png_set_error_fn(pp, ep, efp, wfp) ((void)0) +#define png_malloc(pp, s) malloc(s) +#define png_malloc_warn(pp, s) malloc(s) +#define png_malloc_base(pp, s) malloc(s) +#define png_calloc(pp, s) calloc(1, (s)) +#define png_free(pp, s) free(s) + +#define png_safecat(b, sb, pos, str) (pos) +#define png_format_number(start, end, format, number) (start) + +#define crc32(crc, pp, s) (crc) +#define inflateReset(zs) Z_OK + +#define png_create_struct(type) (0) +#define png_destroy_struct(pp) ((void)0) +#define png_create_struct_2(type, m, mm) (0) +#define png_destroy_struct_2(pp, f, mm) ((void)0) + +#undef PNG_SIMPLIFIED_READ_SUPPORTED +#undef PNG_SIMPLIFIED_WRITE_SUPPORTED +#undef PNG_USER_MEM_SUPPORTED + +#include "../../png.c" + +/* Validate ASCII to fp routines. */ +static int verbose = 0; + +int validation_ascii_to_fp(int count, int argc, char **argv) +{ + int showall = 0; + double max_error=2; /* As a percentage error-in-last-digit/.5 */ + double max_error_abs=17; /* Used when precision is DBL_DIG */ + double max = 0; + double max_abs = 0; + double test = 0; /* Important to test this. */ + int precision = 5; + int nonfinite = 0; + int finite = 0; + int ok = 0; + int failcount = 0; + int minorarith = 0; + + while (--argc > 0) + if (strcmp(*++argv, "-a") == 0) + showall = 1; + else if (strcmp(*argv, "-e") == 0 && argc > 0) + { + --argc; + max_error = atof(*++argv); + } + else if (strcmp(*argv, "-E") == 0 && argc > 0) + { + --argc; + max_error_abs = atof(*++argv); + } + else + { + fprintf(stderr, "unknown argument %s\n", *argv); + return 1; + } + + do + { + png_size_t index; + int state, failed = 0; + char buffer[64]; + + if (isfinite(test)) + ++finite; + else + ++nonfinite; + + if (verbose) + fprintf(stderr, "%.*g %d\n", DBL_DIG, test, precision); + + /* Check for overflow in the buffer by setting a marker. */ + memset(buffer, 71, sizeof buffer); + + png_ascii_from_fp(0, buffer, precision+10, test, precision); + + /* Allow for a three digit exponent, this stuff will fail if + * the exponent is bigger than this! + */ + if (buffer[precision+7] != 71) + { + fprintf(stderr, "%g[%d] -> '%s'[%lu] buffer overflow\n", test, + precision, buffer, (unsigned long)strlen(buffer)); + failed = 1; + } + + /* Following are used for the number parser below and must be + * initialized to zero. + */ + state = 0; + index = 0; + if (!isfinite(test)) + { + /* Expect 'inf' */ + if (test >= 0 && strcmp(buffer, "inf") || + test < 0 && strcmp(buffer, "-inf")) + { + fprintf(stderr, "%g[%d] -> '%s' but expected 'inf'\n", test, + precision, buffer); + failed = 1; + } + } + else if (!png_check_fp_number(buffer, precision+10, &state, &index) || + buffer[index] != 0) + { + fprintf(stderr, "%g[%d] -> '%s' but has bad format ('%c')\n", test, + precision, buffer, buffer[index]); + failed = 1; + } + else if (PNG_FP_IS_NEGATIVE(state) && !(test < 0)) + { + fprintf(stderr, "%g[%d] -> '%s' but negative value not so reported\n", + test, precision, buffer); + failed = 1; + assert(!PNG_FP_IS_ZERO(state)); + assert(!PNG_FP_IS_POSITIVE(state)); + } + else if (PNG_FP_IS_ZERO(state) && !(test == 0)) + { + fprintf(stderr, "%g[%d] -> '%s' but zero value not so reported\n", + test, precision, buffer); + failed = 1; + assert(!PNG_FP_IS_NEGATIVE(state)); + assert(!PNG_FP_IS_POSITIVE(state)); + } + else if (PNG_FP_IS_POSITIVE(state) && !(test > 0)) + { + fprintf(stderr, "%g[%d] -> '%s' but postive value not so reported\n", + test, precision, buffer); + failed = 1; + assert(!PNG_FP_IS_NEGATIVE(state)); + assert(!PNG_FP_IS_ZERO(state)); + } + else + { + /* Check the result against the original. */ + double out = atof(buffer); + double change = fabs((out - test)/test); + double allow = .5/pow(10, + (precision >= DBL_DIG) ? DBL_DIG-1 : precision-1); + + /* NOTE: if you hit this error case are you compiling with gcc + * and -O0? Try -O2 - the errors can accumulate if the FP + * code above is not optimized and may drift outside the .5 in + * DBL_DIG allowed. In any case a small number of errors may + * occur (very small ones - 1 or 2%) because of rounding in the + * calculations, either in the conversion API or in atof. + */ + if (change >= allow && (isfinite(out) || + fabs(test/DBL_MAX) <= 1-allow)) + { + double percent = (precision >= DBL_DIG) ? max_error_abs : max_error; + double allowp = (change-allow)*100/allow; + + if (precision >= DBL_DIG) + { + if (max_abs < allowp) max_abs = allowp; + } + + else + { + if (max < allowp) max = allowp; + } + + if (showall || allowp >= percent) + { + fprintf(stderr, + "%.*g[%d] -> '%s' -> %.*g number changed (%g > %g (%d%%))\n", + DBL_DIG, test, precision, buffer, DBL_DIG, out, change, allow, + (int)round(allowp)); + failed = 1; + } + else + ++minorarith; + } + } + + if (failed) + ++failcount; + else + ++ok; + +skip: + /* Generate a new number and precision. */ + precision = rand(); + if (precision & 1) test = -test; + precision >>= 1; + + /* Generate random numbers. */ + if (test == 0 || !isfinite(test)) + test = precision+1; + else + { + /* Derive the exponent from the previous rand() value. */ + int exponent = precision % (DBL_MAX_EXP - DBL_MIN_EXP) + DBL_MIN_EXP; + int tmp; + test = frexp(test * rand(), &tmp); + test = ldexp(test, exponent); + precision >>= 8; /* arbitrary */ + } + + /* This limits the precision to 32 digits, enough for standard + * IEEE implementations which have at most 15 digits. + */ + precision = (precision & 0x1f) + 1; + } + while (--count); + + printf("Tested %d finite values, %d non-finite, %d OK (%d failed) %d minor " + "arithmetic errors\n", finite, nonfinite, ok, failcount, minorarith); + printf(" Error with >=%d digit precision %.2f%%\n", DBL_DIG, max_abs); + printf(" Error with < %d digit precision %.2f%%\n", DBL_DIG, max); + + return 0; +} + +/* Observe that valid FP numbers have the forms listed in the PNG extensions + * specification: + * + * [+,-]{integer,integer.fraction,.fraction}[{e,E}[+,-]integer] + * + * Test each of these in turn, including invalid cases. + */ +typedef enum checkfp_state +{ + start, fraction, exponent, states +} checkfp_state; + +/* The characters (other than digits) that characterize the states: */ +static const char none[] = ""; +static const char hexdigits[16] = "0123456789ABCDEF"; + +static const struct +{ + const char *start; /* Characters valid at the start */ + const char *end; /* Valid characters that end the state */ + const char *tests; /* Characters to test after 2 digits seen */ +} +state_characters[states] = +{ + /* start: */ { "+-.", ".eE", "+-.e*0369" }, + /* fraction: */ { none, "eE", "+-.E#0147" }, + /* exponent: */ { "+-", none, "+-.eE^0258" } +}; + +typedef struct +{ + char number[1024]; /* Buffer for number being tested */ + int limit; /* Command line limit */ + int verbose; /* Shadows global variable */ + int ctimes; /* Number of numbers tested */ + int cmillions; /* Count of millions of numbers */ + int cinvalid; /* Invalid strings checked */ + int cnoaccept; /* Characters not accepted */ +} +checkfp_command; + +typedef struct +{ + int cnumber; /* Index into number string */ + checkfp_state check_state; /* Current number state */ + int at_start; /* At start (first character) of state */ + int cdigits_in_state; /* Digits seen in that state */ + int limit; /* Limit on same for checking all chars */ + int state; /* Current parser state */ + int is_negative; /* Number is negative */ + int is_zero; /* Number is (still) zero */ + int number_was_valid; /* Previous character validity */ +} +checkfp_control; + +static int check_all_characters(checkfp_command *co, checkfp_control c); + +static int check_some_characters(checkfp_command *co, checkfp_control c, + const char *tests); + +static int check_one_character(checkfp_command *co, checkfp_control c, int ch) +{ + /* Test this character (ch) to ensure the parser does the correct thing. + */ + png_size_t index = 0; + const char test = (char)ch; + const int number_is_valid = png_check_fp_number(&test, 1, &c.state, &index); + const int character_accepted = (index == 1); + + if (c.check_state != exponent && isdigit(ch) && ch != '0') + c.is_zero = 0; + + if (c.check_state == start && c.at_start && ch == '-') + c.is_negative = 1; + + if (isprint(ch)) + co->number[c.cnumber++] = (char)ch; + else + { + co->number[c.cnumber++] = '<'; + co->number[c.cnumber++] = hexdigits[(ch >> 4) & 0xf]; + co->number[c.cnumber++] = hexdigits[ch & 0xf]; + co->number[c.cnumber++] = '>'; + } + co->number[c.cnumber] = 0; + + if (co->verbose > 1) + fprintf(stderr, "%s\n", co->number); + + if (++(co->ctimes) == 1000000) + { + if (co->verbose == 1) + fputc('.', stderr); + co->ctimes = 0; + ++(co->cmillions); + } + + if (!number_is_valid) + ++(co->cinvalid); + + if (!character_accepted) + ++(co->cnoaccept); + + /* This should never fail (it's a serious bug if it does): */ + if (index != 0 && index != 1) + { + fprintf(stderr, "%s: read beyond end of string (%lu)\n", co->number, + (unsigned long)index); + return 0; + } + + /* Validate the new state, note that the PNG_FP_IS_ macros all return + * false unless the number is valid. + */ + if (PNG_FP_IS_NEGATIVE(c.state) != + (number_is_valid && !c.is_zero && c.is_negative)) + { + fprintf(stderr, "%s: negative when it is not\n", co->number); + return 0; + } + + if (PNG_FP_IS_ZERO(c.state) != (number_is_valid && c.is_zero)) + { + fprintf(stderr, "%s: zero when it is not\n", co->number); + return 0; + } + + if (PNG_FP_IS_POSITIVE(c.state) != + (number_is_valid && !c.is_zero && !c.is_negative)) + { + fprintf(stderr, "%s: positive when it is not\n", co->number); + return 0; + } + + /* Testing a digit */ + if (isdigit(ch)) + { + if (!character_accepted) + { + fprintf(stderr, "%s: digit '%c' not accepted\n", co->number, ch); + return 0; + } + + if (!number_is_valid) + { + fprintf(stderr, "%s: saw a digit (%c) but number not valid\n", + co->number, ch); + return 0; + } + + ++c.cdigits_in_state; + c.at_start = 0; + c.number_was_valid = 1; + + /* Continue testing characters in this state. Either test all of + * them or, if we have already seen one digit in this state, just test a + * limited set. + */ + if (c.cdigits_in_state < 1) + return check_all_characters(co, c); + + else + return check_some_characters(co, c, + state_characters[c.check_state].tests); + } + + /* A non-digit; is it allowed here? */ + else if (((ch == '+' || ch == '-') && c.check_state != fraction && + c.at_start) || + (ch == '.' && c.check_state == start) || + ((ch == 'e' || ch == 'E') && c.number_was_valid && + c.check_state != exponent)) + { + if (!character_accepted) + { + fprintf(stderr, "%s: character '%c' not accepted\n", co->number, ch); + return 0; + } + + /* The number remains valid after start of fraction but nowhere else. */ + if (number_is_valid && (c.check_state != start || ch != '.')) + { + fprintf(stderr, "%s: saw a non-digit (%c) but number valid\n", + co->number, ch); + return 0; + } + + c.number_was_valid = number_is_valid; + + /* Check for a state change. When changing to 'fraction' if the number + * is valid at this point set the at_start to false to allow an exponent + * 'e' to come next. + */ + if (c.check_state == start && ch == '.') + { + c.check_state = fraction; + c.at_start = !number_is_valid; + c.cdigits_in_state = 0; + c.limit = co->limit; + return check_all_characters(co, c); + } + + else if (c.check_state < exponent && (ch == 'e' || ch == 'E')) + { + c.check_state = exponent; + c.at_start = 1; + c.cdigits_in_state = 0; + c.limit = co->limit; + return check_all_characters(co, c); + } + + /* Else it was a sign, and the state doesn't change. */ + else + { + if (ch != '-' && ch != '+') + { + fprintf(stderr, "checkfp: internal error (1)\n"); + return 0; + } + + c.at_start = 0; + return check_all_characters(co, c); + } + } + + /* Testing an invalid character */ + else + { + if (character_accepted) + { + fprintf(stderr, "%s: character '%c' [0x%.2x] accepted\n", co->number, + ch, ch); + return 0; + } + + if (number_is_valid != c.number_was_valid) + { + fprintf(stderr, + "%s: character '%c' [0x%.2x] changed number validity\n", co->number, + ch, ch); + return 0; + } + + /* Do nothing - the parser has stuck; return success and keep going with + * the next character. + */ + } + + /* Successful return (the caller will try the next character.) */ + return 1; +} + +static int check_all_characters(checkfp_command *co, checkfp_control c) +{ + int ch; + + if (c.cnumber+4 < sizeof co->number) for (ch=0; ch<256; ++ch) + { + if (!check_one_character(co, c, ch)) + return 0; + } + + return 1; +} + +static int check_some_characters(checkfp_command *co, checkfp_control c, + const char *tests) +{ + int i; + + --(c.limit); + + if (c.cnumber+4 < sizeof co->number && c.limit >= 0) + { + if (c.limit > 0) for (i=0; tests[i]; ++i) + { + if (!check_one_character(co, c, tests[i])) + return 0; + } + + /* At the end check all the characters. */ + else + return check_all_characters(co, c); + } + + return 1; +} + +int validation_checkfp(int count, int argc, char **argv) +{ + int result; + checkfp_command command; + checkfp_control control; + + command.number[0] = 0; + command.limit = 3; + command.verbose = verbose; + command.ctimes = 0; + command.cmillions = 0; + command.cinvalid = 0; + command.cnoaccept = 0; + + while (--argc > 0) + { + ++argv; + if (argc > 1 && strcmp(*argv, "-l") == 0) + { + --argc; + command.limit = atoi(*++argv); + } + + else + { + fprintf(stderr, "unknown argument %s\n", *argv); + return 1; + } + } + + control.cnumber = 0; + control.check_state = start; + control.at_start = 1; + control.cdigits_in_state = 0; + control.limit = command.limit; + control.state = 0; + control.is_negative = 0; + control.is_zero = 1; + control.number_was_valid = 0; + + result = check_all_characters(&command, control); + + printf("checkfp: %s: checked %d,%.3d,%.3d,%.3d strings (%d invalid)\n", + result ? "pass" : "FAIL", command.cmillions / 1000, + command.cmillions % 1000, command.ctimes / 1000, command.ctimes % 1000, + command.cinvalid); + + return result; +} + +int validation_muldiv(int count, int argc, char **argv) +{ + int tested = 0; + int overflow = 0; + int error = 0; + int error64 = 0; + int passed = 0; + int randbits = 0; + png_uint_32 randbuffer; + png_fixed_point a; + png_int_32 times, div; + + while (--argc > 0) + { + fprintf(stderr, "unknown argument %s\n", *++argv); + return 1; + } + + /* Find out about the random number generator. */ + randbuffer = RAND_MAX; + while (randbuffer != 0) ++randbits, randbuffer >>= 1; + printf("Using random number generator that makes %d bits\n", randbits); + for (div=0; div<32; div += randbits) + randbuffer = (randbuffer << randbits) ^ rand(); + + a = 0; + times = div = 0; + do + { + png_fixed_point result; + /* NOTE: your mileage may vary, a type is required below that can + * hold 64 bits or more, if floating point is used a 64 bit or + * better mantissa is required. + */ + long long int fp, fpround; + unsigned long hi, lo; + int ok; + + /* Check the values, png_64bit_product can only handle positive + * numbers, so correct for that here. + */ + { + long u1, u2; + int n = 0; + if (a < 0) u1 = -a, n = 1; else u1 = a; + if (times < 0) u2 = -times, n = !n; else u2 = times; + png_64bit_product(u1, u2, &hi, &lo); + if (n) + { + /* -x = ~x+1 */ + lo = ((~lo) + 1) & 0xffffffff; + hi = ~hi; + if (lo == 0) ++hi; + } + } + + fp = a; + fp *= times; + if ((fp & 0xffffffff) != lo || ((fp >> 32) & 0xffffffff) != hi) + { + fprintf(stderr, "png_64bit_product %d * %d -> %lx|%.8lx not %llx\n", + a, times, hi, lo, fp); + ++error64; + } + + if (div != 0) + { + /* Round - this is C round to zero. */ + if ((fp < 0) != (div < 0)) + fp -= div/2; + else + fp += div/2; + + fp /= div; + fpround = fp; + /* Assume 2's complement here: */ + ok = fpround <= PNG_UINT_31_MAX && + fpround >= -1-(long long int)PNG_UINT_31_MAX; + if (!ok) ++overflow; + } + else + ok = 0, ++overflow, fpround = fp/*misleading*/; + + if (verbose) + fprintf(stderr, "TEST %d * %d / %d -> %lld (%s)\n", a, times, div, + fp, ok ? "ok" : "overflow"); + + ++tested; + if (png_muldiv(&result, a, times, div) != ok) + { + ++error; + if (ok) + fprintf(stderr, "%d * %d / %d -> overflow (expected %lld)\n", a, + times, div, fp); + else + fprintf(stderr, "%d * %d / %d -> %d (expected overflow %lld)\n", a, + times, div, result, fp); + } + else if (ok && result != fpround) + { + ++error; + fprintf(stderr, "%d * %d / %d -> %d not %lld\n", a, times, div, result, + fp); + } + else + ++passed; + + /* Generate three new values, this uses rand() and rand() only returns + * up to RAND_MAX. + */ + /* CRUDE */ + a += times; + times += div; + div = randbuffer; + randbuffer = (randbuffer << randbits) ^ rand(); + } + while (--count > 0); + + printf("%d tests including %d overflows, %d passed, %d failed (%d 64 bit " + "errors)\n", tested, overflow, passed, error, error64); + return 0; +} + +/* When FP is on this just becomes a speed test - compile without FP to get real + * validation. + */ +#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED +#define LN2 .000010576586617430806112933839 /* log(2)/65536 */ +#define L2INV 94548.46219969910586572651 /* 65536/log(2) */ + +/* For speed testing, need the internal functions too: */ +static png_uint_32 png_log8bit(unsigned x) +{ + if (x > 0) + return (png_uint_32)floor(.5-log(x/255.)*L2INV); + + return 0xffffffff; +} + +static png_uint_32 png_log16bit(png_uint_32 x) +{ + if (x > 0) + return (png_uint_32)floor(.5-log(x/65535.)*L2INV); + + return 0xffffffff; +} + +static png_uint_32 png_exp(png_uint_32 x) +{ + return (png_uint_32)floor(.5 + exp(x * -LN2) * 0xffffffffU); +} + +static png_byte png_exp8bit(png_uint_32 log) +{ + return (png_byte)floor(.5 + exp(log * -LN2) * 255); +} + +static png_uint_16 png_exp16bit(png_uint_32 log) +{ + return (png_uint_16)floor(.5 + exp(log * -LN2) * 65535); +} +#endif /* FLOATING_ARITHMETIC */ + +int validation_gamma(int argc, char **argv) +{ + double gamma[9] = { 2.2, 1.8, 1.52, 1.45, 1., 1/1.45, 1/1.52, 1/1.8, 1/2.2 }; + double maxerr; + int i, silent=0, onlygamma=0; + + /* Silence the output with -s, just test the gamma functions with -g: */ + while (--argc > 0) + if (strcmp(*++argv, "-s") == 0) + silent = 1; + else if (strcmp(*argv, "-g") == 0) + onlygamma = 1; + else + { + fprintf(stderr, "unknown argument %s\n", *argv); + return 1; + } + + if (!onlygamma) + { + /* First validate the log functions: */ + maxerr = 0; + for (i=0; i<256; ++i) + { + double correct = -log(i/255.)/log(2.)*65536; + double error = png_log8bit(i) - correct; + + if (i != 0 && fabs(error) > maxerr) + maxerr = fabs(error); + + if (i == 0 && png_log8bit(i) != 0xffffffff || + i != 0 && png_log8bit(i) != floor(correct+.5)) + { + fprintf(stderr, "8 bit log error: %d: got %u, expected %f\n", + i, png_log8bit(i), correct); + } + } + + if (!silent) + printf("maximum 8 bit log error = %f\n", maxerr); + + maxerr = 0; + for (i=0; i<65536; ++i) + { + double correct = -log(i/65535.)/log(2.)*65536; + double error = png_log16bit(i) - correct; + + if (i != 0 && fabs(error) > maxerr) + maxerr = fabs(error); + + if (i == 0 && png_log16bit(i) != 0xffffffff || + i != 0 && png_log16bit(i) != floor(correct+.5)) + { + if (error > .68) /* By experiment error is less than .68 */ + { + fprintf(stderr, "16 bit log error: %d: got %u, expected %f" + " error: %f\n", i, png_log16bit(i), correct, error); + } + } + } + + if (!silent) + printf("maximum 16 bit log error = %f\n", maxerr); + + /* Now exponentiations. */ + maxerr = 0; + for (i=0; i<=0xfffff; ++i) + { + double correct = exp(-i/65536. * log(2.)) * (65536. * 65536); + double error = png_exp(i) - correct; + + if (fabs(error) > maxerr) + maxerr = fabs(error); + if (fabs(error) > 1883) /* By experiment. */ + { + fprintf(stderr, "32 bit exp error: %d: got %u, expected %f" + " error: %f\n", i, png_exp(i), correct, error); + } + } + + if (!silent) + printf("maximum 32 bit exp error = %f\n", maxerr); + + maxerr = 0; + for (i=0; i<=0xfffff; ++i) + { + double correct = exp(-i/65536. * log(2.)) * 255; + double error = png_exp8bit(i) - correct; + + if (fabs(error) > maxerr) + maxerr = fabs(error); + if (fabs(error) > .50002) /* By experiment */ + { + fprintf(stderr, "8 bit exp error: %d: got %u, expected %f" + " error: %f\n", i, png_exp8bit(i), correct, error); + } + } + + if (!silent) + printf("maximum 8 bit exp error = %f\n", maxerr); + + maxerr = 0; + for (i=0; i<=0xfffff; ++i) + { + double correct = exp(-i/65536. * log(2.)) * 65535; + double error = png_exp16bit(i) - correct; + + if (fabs(error) > maxerr) + maxerr = fabs(error); + if (fabs(error) > .524) /* By experiment */ + { + fprintf(stderr, "16 bit exp error: %d: got %u, expected %f" + " error: %f\n", i, png_exp16bit(i), correct, error); + } + } + + if (!silent) + printf("maximum 16 bit exp error = %f\n", maxerr); + } /* !onlygamma */ + + /* Test the overall gamma correction. */ + for (i=0; i<9; ++i) + { + unsigned j; + double g = gamma[i]; + png_fixed_point gfp = floor(g * PNG_FP_1 + .5); + + if (!silent) + printf("Test gamma %f\n", g); + + maxerr = 0; + for (j=0; j<256; ++j) + { + double correct = pow(j/255., g) * 255; + png_byte out = png_gamma_8bit_correct(j, gfp); + double error = out - correct; + + if (fabs(error) > maxerr) + maxerr = fabs(error); + if (out != floor(correct+.5)) + { + fprintf(stderr, "8bit %d ^ %f: got %d expected %f error %f\n", + j, g, out, correct, error); + } + } + + if (!silent) + printf("gamma %f: maximum 8 bit error %f\n", g, maxerr); + + maxerr = 0; + for (j=0; j<65536; ++j) + { + double correct = pow(j/65535., g) * 65535; + png_uint_16 out = png_gamma_16bit_correct(j, gfp); + double error = out - correct; + + if (fabs(error) > maxerr) + maxerr = fabs(error); + if (fabs(error) > 1.62) + { + fprintf(stderr, "16bit %d ^ %f: got %d expected %f error %f\n", + j, g, out, correct, error); + } + } + + if (!silent) + printf("gamma %f: maximum 16 bit error %f\n", g, maxerr); + } + + return 0; +} + +/**************************** VALIDATION TESTS ********************************/ +/* Various validation routines are included herein, they require some + * definition for png_warning and png_error, seetings of VALIDATION: + * + * 1: validates the ASCII to floating point conversions + * 2: validates png_muldiv + * 3: accuracy test of fixed point gamma tables + */ + +/* The following COUNT (10^8) takes about 1 hour on a 1GHz Pentium IV + * processor. + */ +#define COUNT 1000000000 + +int main(int argc, char **argv) +{ + int count = COUNT; + + while (argc > 1) + { + if (argc > 2 && strcmp(argv[1], "-c") == 0) + { + count = atoi(argv[2]); + argc -= 2; + argv += 2; + } + + else if (strcmp(argv[1], "-v") == 0) + { + ++verbose; + --argc; + ++argv; + } + + else + break; + } + + if (count > 0 && argc > 1) + { + if (strcmp(argv[1], "ascii") == 0) + return validation_ascii_to_fp(count, argc-1, argv+1); + else if (strcmp(argv[1], "checkfp") == 0) + return validation_checkfp(count, argc-1, argv+1); + else if (strcmp(argv[1], "muldiv") == 0) + return validation_muldiv(count, argc-1, argv+1); + else if (strcmp(argv[1], "gamma") == 0) + return validation_gamma(argc-1, argv+1); + } + + /* Bad argument: */ + fprintf(stderr, + "usage: tarith [-v] [-c count] {ascii,muldiv,gamma} [args]\n"); + fprintf(stderr, " arguments: ascii [-a (all results)] [-e error%%]\n"); + fprintf(stderr, " checkfp [-l max-number-chars]\n"); + fprintf(stderr, " muldiv\n"); + fprintf(stderr, " gamma -s (silent) -g (only gamma; no log)\n"); + return 1; +} diff -ru4NwbB libpng-1.5.13/contrib/libtests/test-pngstest.sh libpng-1.6.0beta32/contrib/libtests/test-pngstest.sh --- libpng-1.5.13/contrib/libtests/test-pngstest.sh 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/test-pngstest.sh 2012-11-25 12:40:12.978717508 -0600 @@ -0,0 +1,24 @@ +#!/bin/sh +# +# Run the simplified API tests +err=0 + +echo >> pngtest-log.txt +echo "============ pngstest.sh ==============" >> pngtest-log.txt + +echo "Running test-pngstest.sh" +for image in ${srcdir}/contrib/pngsuite/*.png +do + for opts in "" + do + if ./pngstest --strict --log "$@" $opts $image >>pngtest-log.txt 2>&1 + then + echo " PASS: pngstest $opts $image" + else + echo " FAIL: pngstest $opts $image" + err=1 + fi + done +done + +exit $err diff -ru4NwbB libpng-1.5.13/contrib/libtests/test-pngunknown.sh libpng-1.6.0beta32/contrib/libtests/test-pngunknown.sh --- libpng-1.5.13/contrib/libtests/test-pngunknown.sh 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/test-pngunknown.sh 2012-11-25 12:40:12.990958310 -0600 @@ -0,0 +1,38 @@ +#!/bin/sh +# +# Run the unknown API tests +err=0 +image="${srcdir}/pngtest.png" +# +# stream 4 is used for the output of the shell, pngtest-log.txt gets all the +# normal program output. +exec 4>&1 1>>pngtest-log.txt 2>&1 + +echo +echo "============ test-pngunknown.sh ==============" + +echo "Running test-pngunknown.sh" >&4 + +for tests in \ + "discard default=discard"\ + "save default=save"\ + "if-safe default=if-safe"\ + "vpAg vpAg=if-safe"\ + "sTER sTER=if-safe"\ + "IDAT default=discard IDAT=save"\ + "sAPI bKGD=save cHRM=save gAMA=save all=discard iCCP=save sBIT=save sRGB=save" +do + set $tests + test="$1" + shift + + if ./pngunknown "$@" "$image" 4>&- + then + echo " PASS: test-pngunknown $test" >&4 + else + echo " FAIL: test-pngunknown $test" >&4 + err=1 + fi +done + +exit $err diff -ru4NwbB libpng-1.5.13/contrib/libtests/test-pngvalid-full.sh libpng-1.6.0beta32/contrib/libtests/test-pngvalid-full.sh --- libpng-1.5.13/contrib/libtests/test-pngvalid-full.sh 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/test-pngvalid-full.sh 2012-11-25 12:40:13.002458511 -0600 @@ -0,0 +1,21 @@ +#!/bin/sh +# +# Run a sequence of gamma tests quietly +err=0 + +echo >> pngtest-log.txt +echo "============ pngvalid-full.sh ==============" >> pngtest-log.txt + +echo "Running test-pngvalid-full.sh" +for gamma in threshold transform sbit 16-to-8 background alpha-mode "transform --expand16" "background --expand16" "alpha-mode --expand16" +do + if ./pngvalid "$@" --gamma-$gamma >> pngtest-log.txt 2>&1 + then + echo " PASS: pngvalid" "$@" "--gamma-$gamma" + else + echo " FAIL: pngvalid" "$@" "--gamma-$gamma" + err=1 + fi +done + +exit $err diff -ru4NwbB libpng-1.5.13/contrib/libtests/test-pngvalid-simple.sh libpng-1.6.0beta32/contrib/libtests/test-pngvalid-simple.sh --- libpng-1.5.13/contrib/libtests/test-pngvalid-simple.sh 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/test-pngvalid-simple.sh 2012-11-25 12:40:13.014199849 -0600 @@ -0,0 +1,30 @@ +#!/bin/sh +# +# Run a sequence of tests quietly, without the slow +# gamma tests +err=0 + +echo >> pngtest-log.txt +echo "============ pngvalid-simple.sh ==============" >> pngtest-log.txt +echo "Running test-pngvalid-simple.sh" +# The options to test are: +# +# standard tests with and without progressive reading and interlace +# size images with and without progressive reading +# transform tests (standard, non-interlaced only) +# +for opts in "--standard" "--standard --progressive-read" \ + "--standard --interlace" "--standard --progressive-read --interlace" \ + "--size" "--size --progressive-read" \ + "--transform" +do + if ./pngvalid "$@" $opts >> pngtest-log.txt 2>&1 + then + echo " PASS: pngvalid" "$@" $opts + else + echo " FAIL: pngvalid" "$@" $opts + err=1 + fi +done + +exit $err diff -ru4NwbB libpng-1.5.13/contrib/libtests/timepng.c libpng-1.6.0beta32/contrib/libtests/timepng.c --- libpng-1.5.13/contrib/libtests/timepng.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/libtests/timepng.c 2012-11-25 12:40:13.025285514 -0600 @@ -0,0 +1,303 @@ +/* timepng.c + * + * Copyright (c) 2012 John Cunningham Bowler + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * Load an arbitrary number of PNG files (from the command line, or, if there + * are no arguments on the command line, from stdin) then run a time test by + * reading each file by row. The test does nothing with the read result and + * does no transforms. The only output is a time as a floating point number of + * seconds with 9 decimal digits. + */ +#define _POSIX_C_SOURCE 199309L /* for clock_gettime */ + +#include +#include +#include + +#include + +#if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H) +# include +#endif + +/* Define the following to use this test against your installed libpng, rather + * than the one being built here: + */ +#ifdef PNG_FREESTANDING_TESTS +# include +#else +# include "../../png.h" +#endif + +static int read_png(FILE *fp) +{ + png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0); + png_infop info_ptr = NULL; + png_bytep row = NULL, display = NULL; + + if (png_ptr == NULL) + return 0; + + if (setjmp(png_jmpbuf(png_ptr))) + { + png_destroy_read_struct(&png_ptr, &info_ptr, NULL); + if (row != NULL) free(row); + if (display != NULL) free(display); + return 0; + } + + png_init_io(png_ptr, fp); + + info_ptr = png_create_info_struct(png_ptr); + if (info_ptr == NULL) + png_error(png_ptr, "OOM allocating info structure"); + + png_read_info(png_ptr, info_ptr); + + { + png_size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr); + + row = malloc(rowbytes); + display = malloc(rowbytes); + + if (row == NULL || display == NULL) + png_error(png_ptr, "OOM allocating row buffers"); + + { + png_uint_32 height = png_get_image_height(png_ptr, info_ptr); + int passes = png_set_interlace_handling(png_ptr); + int pass; + + png_start_read_image(png_ptr); + + for (pass = 0; pass < passes; ++pass) + { + png_uint_32 y = height; + + /* NOTE: this trashes the row each time; interlace handling won't + * work, but this avoids memory thrashing for speed testing. + */ + while (y-- > 0) + png_read_row(png_ptr, row, display); + } + } + } + + /* Make sure to read to the end of the file: */ + png_read_end(png_ptr, info_ptr); + png_destroy_read_struct(&png_ptr, &info_ptr, NULL); + free(row); + free(display); + return 1; +} + +static int mytime(struct timespec *t) +{ + /* Do the timing using clock_gettime and the per-process timer. */ + if (!clock_gettime(CLOCK_PROCESS_CPUTIME_ID, t)) + return 1; + + perror("CLOCK_PROCESS_CPUTIME_ID"); + fprintf(stderr, "timepng: could not get the time\n"); + return 0; +} + +static int perform_one_test(FILE *fp, int nfiles) +{ + int i; + struct timespec before, after; + + /* Clear out all errors: */ + rewind(fp); + + if (mytime(&before)) + { + for (i=0; i 1) + { + int i; + + for (i=1; i 0) + ok = perform_one_test(fp, nfiles); + + else + fprintf(stderr, "usage: timepng {files} or ls files | timepng\n"); + } + + (void)fclose(fp); + } + + else + fprintf(stderr, "timepng: could not open temporary file\n"); + + /* Exit code 0 on success. */ + return ok == 0; +} diff -ru4NwbB libpng-1.5.13/contrib/pngminim/decoder/makefile libpng-1.6.0beta32/contrib/pngminim/decoder/makefile --- libpng-1.5.13/contrib/pngminim/decoder/makefile 2012-09-27 06:21:20.528143732 -0500 +++ libpng-1.6.0beta32/contrib/pngminim/decoder/makefile 2012-11-25 12:40:10.869842505 -0600 @@ -13,9 +13,9 @@ RM=rm -f COPY=cp -CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP -I. -O1 +CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP -I. -O1 C=.c O=.o L=.a diff -ru4NwbB libpng-1.5.13/contrib/pngminim/decoder/pngusr.dfa libpng-1.6.0beta32/contrib/pngminim/decoder/pngusr.dfa --- libpng-1.5.13/contrib/pngminim/decoder/pngusr.dfa 2012-09-27 06:21:20.537087115 -0500 +++ libpng-1.6.0beta32/contrib/pngminim/decoder/pngusr.dfa 2012-11-25 12:40:10.878901398 -0600 @@ -36,4 +36,5 @@ option SETJMP on option STDIO on option READ_EXPAND on option READ_STRIP_16_TO_8 on +option USER_LIMITS on diff -ru4NwbB libpng-1.5.13/contrib/pngminim/encoder/makefile libpng-1.6.0beta32/contrib/pngminim/encoder/makefile --- libpng-1.5.13/contrib/pngminim/encoder/makefile 2012-09-27 06:21:20.564500862 -0500 +++ libpng-1.6.0beta32/contrib/pngminim/encoder/makefile 2012-11-25 12:40:10.906862636 -0600 @@ -13,9 +13,9 @@ RM=rm -f COPY=cp -CFLAGS=-DPNG_USER_CONFIG -DNO_GZIP -I. -O1 +CFLAGS=-DPNG_USER_CONFIG -DZ_SOLO -DNO_GZIP -I. -O1 C=.c O=.o L=.a diff -ru4NwbB libpng-1.5.13/contrib/pngminim/preader/makefile libpng-1.6.0beta32/contrib/pngminim/preader/makefile --- libpng-1.5.13/contrib/pngminim/preader/makefile 2012-09-27 06:21:20.600694009 -0500 +++ libpng-1.6.0beta32/contrib/pngminim/preader/makefile 2012-11-25 12:40:10.944538089 -0600 @@ -29,9 +29,9 @@ #LIBS = $(XLIB) LIBS = $(XLIB) -lm #platforms that need libm -CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DNO_GZIP -I. $(XINC) -O1 +CFLAGS=-DPNG_USER_CONFIG -DNO_GZCOMPRESS -DZ_SOLO -DNO_GZIP -I. $(XINC) -O1 C=.c O=.o L=.a diff -ru4NwbB libpng-1.5.13/contrib/pngminus/makefile.std libpng-1.6.0beta32/contrib/pngminus/makefile.std --- libpng-1.5.13/contrib/pngminus/makefile.std 2012-09-27 06:21:20.193763560 -0500 +++ libpng-1.6.0beta32/contrib/pngminus/makefile.std 2012-11-25 12:40:10.548832583 -0600 @@ -7,11 +7,11 @@ RM=rm -f #PNGPATH = /usr/local -#PNGINC = -I$(PNGPATH)/include/libpng15 -#PNGLIB = -L$(PNGPATH)/lib -lpng15 -#PNGLIBS = $(PNGPATH)/lib/libpng15.a +#PNGINC = -I$(PNGPATH)/include/libpng16 +#PNGLIB = -L$(PNGPATH)/lib -lpng16 +#PNGLIBS = $(PNGPATH)/lib/libpng16.a PNGINC = -I../.. PNGLIB = -L../.. -lpng PNGLIBS = ../../libpng.a diff -ru4NwbB libpng-1.5.13/contrib/pngminus/png2pnm.c libpng-1.6.0beta32/contrib/pngminus/png2pnm.c --- libpng-1.5.13/contrib/pngminus/png2pnm.c 2012-09-27 06:21:20.235198498 -0500 +++ libpng-1.6.0beta32/contrib/pngminus/png2pnm.c 2012-11-25 12:40:10.587323340 -0600 @@ -17,8 +17,9 @@ #ifdef __TURBOC__ #include #include #endif +#include #ifndef BOOL #define BOOL unsigned char #endif diff -ru4NwbB libpng-1.5.13/contrib/pngminus/pnm2png.c libpng-1.6.0beta32/contrib/pngminus/pnm2png.c --- libpng-1.5.13/contrib/pngminus/pnm2png.c 2012-09-27 06:21:20.282555480 -0500 +++ libpng-1.6.0beta32/contrib/pngminus/pnm2png.c 2012-11-25 12:40:10.633437925 -0600 @@ -17,8 +17,9 @@ #ifdef __TURBOC__ #include #include #endif +#include #ifndef BOOL #define BOOL unsigned char #endif @@ -196,8 +197,11 @@ char width_token[16]; char height_token[16]; char maxval_token[16]; int color_type; + unsigned long ul_width, ul_alpha_width; + unsigned long ul_height, ul_alpha_height; + unsigned long ul_maxval; png_uint_32 width, alpha_width; png_uint_32 height, alpha_height; png_uint_32 maxval; int bit_depth = 0; @@ -226,13 +230,17 @@ { raw = (type_token[1] == '5'); color_type = PNG_COLOR_TYPE_GRAY; get_token(pnm_file, width_token); - sscanf (width_token, "%lu", &width); + sscanf (width_token, "%lu", &ul_width); + width = (png_uint_32) ul_width; get_token(pnm_file, height_token); - sscanf (height_token, "%lu", &height); + sscanf (height_token, "%lu", &ul_height); + height = (png_uint_32) ul_height; get_token(pnm_file, maxval_token); - sscanf (maxval_token, "%lu", &maxval); + sscanf (maxval_token, "%lu", &ul_maxval); + maxval = (png_uint_32) ul_maxval; + if (maxval <= 1) bit_depth = 1; else if (maxval <= 3) bit_depth = 2; @@ -247,13 +255,16 @@ { raw = (type_token[1] == '6'); color_type = PNG_COLOR_TYPE_RGB; get_token(pnm_file, width_token); - sscanf (width_token, "%lu", &width); + sscanf (width_token, "%lu", &ul_width); + width = (png_uint_32) ul_width; get_token(pnm_file, height_token); - sscanf (height_token, "%lu", &height); + sscanf (height_token, "%lu", &ul_height); + height = (png_uint_32) ul_height; get_token(pnm_file, maxval_token); - sscanf (maxval_token, "%lu", &maxval); + sscanf (maxval_token, "%lu", &ul_maxval); + maxval = (png_uint_32) ul_maxval; if (maxval <= 1) bit_depth = 1; else if (maxval <= 3) bit_depth = 2; @@ -286,17 +297,20 @@ else if ((type_token[1] == '2') || (type_token[1] == '5')) { alpha_raw = (type_token[1] == '5'); get_token(alpha_file, width_token); - sscanf (width_token, "%lu", &alpha_width); + sscanf (width_token, "%lu", &ul_alpha_width); + alpha_width=(png_uint_32) ul_alpha_width; if (alpha_width != width) return FALSE; get_token(alpha_file, height_token); - sscanf (height_token, "%lu", &alpha_height); + sscanf (height_token, "%lu", &ul_alpha_height); + alpha_height = (png_uint_32) ul_alpha_height; if (alpha_height != height) return FALSE; get_token(alpha_file, maxval_token); - sscanf (maxval_token, "%lu", &maxval); + sscanf (maxval_token, "%lu", &ul_maxval); + maxval = (png_uint_32) ul_maxval; if (maxval <= 1) alpha_depth = 1; else if (maxval <= 3) alpha_depth = 2; @@ -509,17 +523,19 @@ png_uint_32 get_value (FILE *pnm_file, int depth) { static png_uint_32 mask = 0; png_byte token[16]; + unsigned long ul_ret_value; png_uint_32 ret_value; int i = 0; if (mask == 0) for (i = 0; i < depth; i++) mask = (mask << 1) | 0x01; get_token (pnm_file, (char *) token); - sscanf ((const char *) token, "%lu", &ret_value); + sscanf ((const char *) token, "%lu", &ul_ret_value); + ret_value = (png_uint_32) ul_ret_value; ret_value &= mask; if (depth < 8) diff -ru4NwbB libpng-1.5.13/contrib/tools/README.txt libpng-1.6.0beta32/contrib/tools/README.txt --- libpng-1.5.13/contrib/tools/README.txt 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/tools/README.txt 2012-11-25 12:40:13.036704976 -0600 @@ -0,0 +1,26 @@ +This directory (contrib/tools) contains tools used by the authors of libpng. + +Code and data placed in this directory is not required to build libpng, +however the code in this directory has been used to generate data or code in +the body of the libpng source. The source code identifies where this has +been done. Code in this directory may not compile on all operating systems +that libpng supports. + +NO COPYRIGHT RIGHTS ARE CLAIMED TO ANY OF THE FILES IN THIS DIRECTORY. + +To the extent possible under law, the authors have waived all copyright and +related or neighboring rights to this work. This work is published from: +United States. + +The files may be used freely in any way. + +The source code and comments in this directory are the original work of the +people named below. No other person or organization has made contributions to +the work in this directory. + +ORIGINAL AUTHORS + The following people have contributed to the code in this directory. None + of the people below claim any rights with regard to the contents of this + directory. + + John Bowler diff -ru4NwbB libpng-1.5.13/contrib/tools/checksum-icc.c libpng-1.6.0beta32/contrib/tools/checksum-icc.c --- libpng-1.5.13/contrib/tools/checksum-icc.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/tools/checksum-icc.c 2012-11-25 12:40:13.047412884 -0600 @@ -0,0 +1,102 @@ +/* checksum-icc.c + * + * Copyright (c) 2012 John Cunningham Bowler + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + * + * Generate crc32 and adler32 checksums of the given input files, used to + * generate check-codes for use when matching ICC profiles within libpng. + */ +#include + +#include + +static int +read_one_file(FILE *ip, const char *name) +{ + uLong length = 0; + uLong a32 = adler32(0, NULL, 0); + uLong c32 = crc32(0, NULL, 0); + Byte header[132]; + + for (;;) + { + int ch = getc(ip); + Byte b; + + if (ch == EOF) break; + + b = (Byte)ch; + + if (length < sizeof header) + header[length] = b; + + ++length; + a32 = adler32(a32, &b, 1); + c32 = crc32(c32, &b, 1); + } + + if (ferror(ip)) + return 0; + + /* Success */ + printf("PNG_ICC_CHECKSUM(0x%8.8lx, 0x%8.8lx,\n PNG_MD5(" + "0x%2.2x%2.2x%2.2x%2.2x, 0x%2.2x%2.2x%2.2x%2.2x, 0x%2.2x%2.2x%2.2x%2.2x," + " 0x%2.2x%2.2x%2.2x%2.2x), %d,\n" + " \"%4.4d/%2.2d/%2.2d %2.2d:%2.2d:%2.2d\", %lu, \"%s\")\n", + (unsigned long)a32, (unsigned long)c32, + header[84], header[85], header[86], header[87], + header[88], header[89], header[90], header[91], + header[92], header[93], header[94], header[95], + header[96], header[97], header[98], header[99], +# define u16(x) (header[x] * 256 + header[x+1]) +# define u32(x) (u16(x) * 65536 + u16(x+2)) + u32(64), u16(24), u16(26), u16(28), u16(30), u16(32), u16(34), + (unsigned long)length, name); + + return 1; +} + +int main(int argc, char **argv) +{ + int err = 0; + + printf("/* adler32, crc32, MD5[16], intent, date, length, file-name */\n"); + + if (argc > 1) + { + int i; + + for (i=1; i&0 4>&1 5>&2 + else + echo "chkfmt -e: EDITOR must be defined" >&2 + exit 1 + fi +} + +# Function to edit a single file - if the file isn't changed ask the user +# whether or not to continue. This stuff only works if the script is run from +# the command line (otherwise, don't specify -e or you will be sorry). +doed(){ + cp "$file" "$file".orig + "$EDITOR" "$file" 0>&3 1>&4 2>&5 3>&- 4>&- 5>&- || exit 1 + if cmp -s "$file".orig "$file" + then + rm "$file".orig + echo -n "$file: file not changed, type anything to continue: " >&5 + read ans 0>&3 + test -n "$ans" || return 1 + fi + return 0 +} + +# In beta versions the version string which appears in files can be a little +# long and cause spuriously overlong lines. To avoid this subtitute the version +# string with a 'standard' version a.b.cc before checking for long lines. +if test -r png.h +then + vers="`sed -n -e \ + 's/^#define PNG_LIBPNG_VER_STRING .\([0-9]\.[0-9]\.[0-9][0-9a-z]*\).$/\1/p' \ + png.h`" + echo "chkfmt: checking version $vers" +fi +if test -z "$vers" +then + echo "chkfmt: png.h not found, ignoring version number" >&2 +fi + +test -n "$1" || set -- . +find "$@" \( -type d \( -name '.git' -o -name '.libs' -o -name 'projects' \) \ + -prune \) -o \( -type f \ + ! -name '*.[oa]' ! -name '*.l[oa]' ! -name '*.png' ! -name '*.out' \ + ! -name '*.jpg' ! -name '*.patch' ! -name '*.obj' ! -name '*.exe' \ + ! -name '*.com' ! -name '*.tar.*' ! -name '*.zip' ! -name '*.ico' \ + ! -name '*.res' ! -name '*.rc' ! -name '*.mms' ! -name '*.rej' \ + ! -name '*.dsp' ! -name '*.orig' ! -name '*.dfn' ! -name '*.swp' \ + ! -name '~*' ! -name '*.3' \ + ! -name 'missing' ! -name 'mkinstalldirs' ! -name 'depcomp' \ + ! -name 'aclocal.m4' ! -name 'install-sh' ! -name 'Makefile.in' \ + ! -name 'ltmain.sh' ! -name 'config*' -print \) | { + st=0 + while read file + do + case "$file" in + *.mak|*[Mm]akefile.*|*[Mm]akefile) + # Makefiles require tabs, dependency lines can be this long. + check_tabs= + line_length=100;; + *.awk) + # Includes literal tabs + check_tabs= + # The following is arbitrary + line_length=132;; + *contrib/*/*.[ch]) + check_tabs=yes + line_length=96;; + *) + check_tabs=yes + line_length=80;; + esac + + # Note that vers can only contain 0-9, . and a-z + if test -n "$vers" + then + sed -e "s/$vers/a.b.cc/g" "$file" >"$file".$$ + else + cp "$file" "$file".$$ + fi + splt="`fold -$line_length "$file".$$ | diff -c "$file".$$ -`" + rm "$file".$$ + + if test -n "$splt" + then + echo "$file: lines too long" + st=1 + if test -n "$EDITOR" -a -n "$edit" + then + doed "$file" || exit 1 + elif test -n "$verbose" + then + echo "$splt" + fi + fi + if test -n "$check_tabs" + then + tab="`tr -c -d '\t' <"$file"`" + if test -n "$tab" + then + echo "$file: file contains tab characters" + st=1 + if test -n "$EDITOR" -a -n "$edit" + then + doed "$file" || exit 1 + elif test -n "$verbose" + then + echo "$splt" + fi + fi + fi + done + exit $st +} diff -ru4NwbB libpng-1.5.13/contrib/tools/cvtcolor.c libpng-1.6.0beta32/contrib/tools/cvtcolor.c --- libpng-1.5.13/contrib/tools/cvtcolor.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/tools/cvtcolor.c 2012-11-25 12:40:13.069002176 -0600 @@ -0,0 +1,188 @@ +/*- + * convert.c + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * + * COPYRIGHT: Written by John Cunningham Bowler, 2012. + * To the extent possible under law, the author has waived all copyright and + * related or neighboring rights to this work. This work is published from: + * United States. + * + * Convert 8-bit sRGB or 16-bit linear values to another format. + */ +#define _ISOC99_SOURCE 1 + +#include +#include +#include +#include + +#include + +#include "sRGB.h" + +static void +usage(const char *prog) +{ + fprintf(stderr, + "%s: usage: %s [-linear|-sRGB] [-gray|-color] component{1,4}\n", + prog, prog); + exit(1); +} + +unsigned long +component(const char *prog, const char *arg, int issRGB) +{ + char *ep; + unsigned long c = strtoul(arg, &ep, 0); + + if (ep <= arg || *ep || c > 65535 || (issRGB && c > 255)) + { + fprintf(stderr, "%s: %s: invalid component value (%lu)\n", prog, arg, c); + usage(prog); + } + + return c; +} + +int +main(int argc, const char **argv) +{ + const char *prog = *argv++; + int to_linear = 0, to_gray = 0, to_color = 0; + int channels = 0; + double c[4]; + + /* FE_TONEAREST is the IEEE754 round to nearest, preferring even, mode; i.e. + * everything rounds to the nearest value except that '.5' rounds to the + * nearest even value. + */ + fesetround(FE_TONEAREST); + + c[3] = c[2] = c[1] = c[0] = 0; + + while (--argc > 0 && **argv == '-') + { + const char *arg = 1+*argv++; + + if (strcmp(arg, "sRGB") == 0) + to_linear = 0; + + else if (strcmp(arg, "linear") == 0) + to_linear = 1; + + else if (strcmp(arg, "gray") == 0) + to_gray = 1, to_color = 0; + + else if (strcmp(arg, "color") == 0) + to_gray = 0, to_color = 1; + + else + usage(prog); + } + + switch (argc) + { + default: + usage(prog); + break; + + case 4: + c[3] = component(prog, argv[3], to_linear); + ++channels; + case 3: + c[2] = component(prog, argv[2], to_linear); + ++channels; + case 2: + c[1] = component(prog, argv[1], to_linear); + ++channels; + case 1: + c[0] = component(prog, argv[0], to_linear); + ++channels; + break; + } + + if (to_linear) + { + int i; + int components = channels; + + if ((components & 1) == 0) + --components; + + for (i=0; i 0) + for (i=0; i 2) + { + fprintf(stderr, "%s: too many channels (%d) for -color\n", + prog, channels); + usage(prog); + } + + c[3] = c[1]; /* alpha, if present */ + c[2] = c[1] = c[0]; + } + + if (to_linear) + { + int i; + if ((channels & 1) == 0) + { + double alpha = c[channels-1]; + for (i=0; i= 0) + c[i] = sRGB_from_linear(c[i]); + + for (i=0; i= 80) { + print str "," + str = " " $0 "U" + } else + str = t + } + END{ + print str + }' +} +# +# The logarithm table. +cat <= 2^32) x = 2^32-1; + x; +} +END +echo '};' +echo +# +# And the table of adjustment values. +cat <=0;--i){ + (1 - e(-(2^i)/65536*l(2))) * 2^(32-i) +} +END +echo '#endif' diff -ru4NwbB libpng-1.5.13/contrib/tools/makesRGB.c libpng-1.6.0beta32/contrib/tools/makesRGB.c --- libpng-1.5.13/contrib/tools/makesRGB.c 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/tools/makesRGB.c 2012-11-25 12:40:13.091752975 -0600 @@ -0,0 +1,430 @@ +/* makesRGB.c -- build sRGB-to-linear and linear-to-sRGB conversion tables + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * + * COPYRIGHT: Written by John Cunningham Bowler, 2012. + * To the extent possible under law, the author has waived all copyright and + * related or neighboring rights to this work. This work is published from: + * United States. + * + * Make a table to convert 8-bit sRGB encoding values into the closest 16-bit + * linear value. + * + * Make two tables to take a linear value scaled to 255*65535 and return an + * approximation to the 8-bit sRGB encoded value. Calculate the error in these + * tables and display it. + */ +#define _C99_SOURCE 1 +#include +#include +#include + +/* pngpriv.h includes the definition of 'PNG_sRGB_FROM_LINEAR' which is required + * to verify the actual code. + */ +#include "../../pngpriv.h" + +#include "sRGB.h" + +/* The tables are declared 'const' in pngpriv.h, so this redefines the tables to + * be used. + */ +#define png_sRGB_table sRGB_table +#define png_sRGB_base sRGB_base +#define png_sRGB_delta sRGB_delta + +static png_uint_16 png_sRGB_table[256]; +static png_uint_16 png_sRGB_base[512]; +static png_byte png_sRGB_delta[512]; + +static const unsigned int max_input = 255*65535; + +double +fsRGB(double l) +{ + return sRGB_from_linear(l/max_input); +} + +double +sRGB(unsigned int i) +{ + return fsRGB(i); +} + +double +finvsRGB(unsigned int i) +{ + return 65535 * linear_from_sRGB(i/255.); +} + +png_uint_16 +invsRGB(unsigned int i) +{ + unsigned int x = nearbyint(finvsRGB(i)); + + if (x > 65535) + { + fprintf(stderr, "invsRGB(%u) overflows to %u\n", i, x); + exit(1); + } + + return (png_uint_16)x; +} + +int +main(int argc, char **argv) +{ + unsigned int i, i16, ibase; + double min_error = 0; + double max_error = 0; + double min_error16 = 0; + double max_error16 = 0; + double adjust; + double adjust_lo = 0.4, adjust_hi = 0.6, adjust_mid = 0.5; + unsigned int ec_lo = 0, ec_hi = 0, ec_mid = 0; + unsigned int error_count = 0; + unsigned int error_count16 = 0; + int test_only = 0; + + if (argc > 1) + test_only = strcmp("--test", argv[1]) == 0; + + /* Initialize the encoding table first. */ + for (i=0; i<256; ++i) + { + png_sRGB_table[i] = invsRGB(i); + } + + /* Now work out the decoding tables (this is where the error comes in because + * there are 512 set points and 512 straight lines between them.) + */ + for (;;) + { + if (ec_lo == 0) + adjust = adjust_lo; + + else if (ec_hi == 0) + adjust = adjust_hi; + + else if (ec_mid == 0) + adjust = adjust_mid; + + else if (ec_mid < ec_hi) + adjust = (adjust_mid + adjust_hi)/2; + + else if (ec_mid < ec_lo) + adjust = (adjust_mid + adjust_lo)/2; + + else + { + fprintf(stderr, "not reached: %u .. %u .. %u\n", ec_lo, ec_mid, ec_hi); + exit(1); + } + + /* Calculate the table using the current 'adjust' */ + for (i=0; i<=511; ++i) + { + double lo = 255 * sRGB(i << 15); + double hi = 255 * sRGB((i+1) << 15); + unsigned int calc; + + calc = nearbyint((lo+adjust) * 256); + if (calc > 65535) + { + fprintf(stderr, "table[%d][0]: overflow %08x (%d)\n", i, calc, + calc); + exit(1); + } + png_sRGB_base[i] = calc; + + calc = nearbyint((hi-lo) * 32); + if (calc > 255) + { + fprintf(stderr, "table[%d][1]: overflow %08x (%d)\n", i, calc, + calc); + exit(1); + } + png_sRGB_delta[i] = calc; + } + + /* Check the 16-bit linear values alone: */ + error_count16 = 0; + for (i16=0; i16 <= 65535; ++i16) + { + unsigned int i = 255*i16; + unsigned int iexact = nearbyint(255*sRGB(i)); + unsigned int icalc = PNG_sRGB_FROM_LINEAR(i); + + if (icalc != iexact) + ++error_count16; + } + + /* Now try changing the adjustment. */ + if (ec_lo == 0) + ec_lo = error_count16; + + else if (ec_hi == 0) + ec_hi = error_count16; + + else if (ec_mid == 0) + { + ec_mid = error_count16; + printf("/* initial error counts: %u .. %u .. %u */\n", ec_lo, ec_mid, + ec_hi); + } + + else if (error_count16 < ec_mid) + { + printf("/* adjust (mid ): %f: %u -> %u */\n", adjust, ec_mid, + error_count16); + ec_mid = error_count16; + adjust_mid = adjust; + } + + else if (adjust < adjust_mid && error_count16 < ec_lo) + { + printf("/* adjust (low ): %f: %u -> %u */\n", adjust, ec_lo, + error_count16); + ec_lo = error_count16; + adjust_lo = adjust; + } + + else if (adjust > adjust_mid && error_count16 < ec_hi) + { + printf("/* adjust (high): %f: %u -> %u */\n", adjust, ec_hi, + error_count16); + ec_hi = error_count16; + adjust_hi = adjust; + } + + else + { + adjust = adjust_mid; + printf("/* adjust: %f: %u */\n", adjust, ec_mid); + break; + } + } + + /* For each entry in the table try to adjust it to minimize the error count + * in that entry. Each entry corresponds to 128 input values. + */ + for (ibase=0; ibase<65536; ibase+=128) + { + png_uint_16 base = png_sRGB_base[ibase >> 7], trybase = base, ob=base; + png_byte delta = png_sRGB_delta[ibase >> 7], trydelta = delta, od=delta; + unsigned int ecbase = 0, eco; + + for (;;) + { + png_sRGB_base[ibase >> 7] = trybase; + png_sRGB_delta[ibase >> 7] = trydelta; + + /* Check the 16-bit linear values alone: */ + error_count16 = 0; + for (i16=ibase; i16 < ibase+128; ++i16) + { + unsigned int i = 255*i16; + unsigned int iexact = nearbyint(255*sRGB(i)); + unsigned int icalc = PNG_sRGB_FROM_LINEAR(i); + + if (icalc != iexact) + ++error_count16; + } + + if (error_count16 == 0) + break; + + if (ecbase == 0) + { + eco = ecbase = error_count16; + ++trybase; /* First test */ + } + + else if (error_count16 < ecbase) + { + if (trybase > base) + { + base = trybase; + ++trybase; + } + else if (trybase < base) + { + base = trybase; + --trybase; + } + else if (trydelta > delta) + { + delta = trydelta; + ++trydelta; + } + else if (trydelta < delta) + { + delta = trydelta; + --trydelta; + } + else + { + fprintf(stderr, "makesRGB: impossible\n"); + exit(1); + } + ecbase = error_count16; + } + + else + { + if (trybase > base) + trybase = base-1; + else if (trybase < base) + { + trybase = base; + ++trydelta; + } + else if (trydelta > delta) + trydelta = delta-1; + else if (trydelta < delta) + break; /* end of tests */ + } + } + + png_sRGB_base[ibase >> 7] = base; + png_sRGB_delta[ibase >> 7] = delta; + if (base != ob || delta != od) + { + printf("/* table[%u]={%u,%u} -> {%u,%u} %u -> %u errors */\n", + ibase>>7, ob, od, base, delta, eco, ecbase); + } + else if (0) + printf("/* table[%u]={%u,%u} %u errors */\n", ibase>>7, ob, od, + ecbase); + } + + /* Only do the full (slow) test at the end: */ + min_error = -.4999; + max_error = .4999; + error_count = 0; + + for (i=0; i <= max_input; ++i) + { + unsigned int iexact = nearbyint(255*sRGB(i)); + unsigned int icalc = PNG_sRGB_FROM_LINEAR(i); + + if (icalc != iexact) + { + double err = 255*sRGB(i) - icalc; + + if (err > (max_error+.001) || err < (min_error-.001)) + { + printf( + "/* 0x%08x: exact: %3d, got: %3d [tables: %08x, %08x] (%f) */\n", + i, iexact, icalc, png_sRGB_base[i>>15], + png_sRGB_delta[i>>15], err); + } + + ++error_count; + if (err > max_error) + max_error = err; + else if (err < min_error) + min_error = err; + } + } + + /* Re-check the 16-bit cases too, including the warning if there is an error + * bigger than 1. + */ + error_count16 = 0; + max_error16 = 0; + min_error16 = 0; + for (i16=0; i16 <= 65535; ++i16) + { + unsigned int i = 255*i16; + unsigned int iexact = nearbyint(255*sRGB(i)); + unsigned int icalc = PNG_sRGB_FROM_LINEAR(i); + + if (icalc != iexact) + { + double err = 255*sRGB(i) - icalc; + + ++error_count16; + if (err > max_error16) + max_error16 = err; + else if (err < min_error16) + min_error16 = err; + + if (abs(icalc - iexact) > 1) + printf( + "/* 0x%04x: exact: %3d, got: %3d [tables: %08x, %08x] (%f) */\n", + i16, iexact, icalc, png_sRGB_base[i>>15], + png_sRGB_delta[i>>15], err); + } + } + + /* Check the round trip for each 8-bit sRGB value. */ + for (i16=0; i16 <= 255; ++i16) + { + unsigned int i = 255 * png_sRGB_table[i16]; + unsigned int iexact = nearbyint(255*sRGB(i)); + unsigned int icalc = PNG_sRGB_FROM_LINEAR(i); + + if (i16 != iexact) + { + fprintf(stderr, "8-bit rounding error: %d -> %d\n", i16, iexact); + exit(1); + } + + if (icalc != i16) + { + double finv = finvsRGB(i16); + + printf("/* 8-bit roundtrip error: %d -> %f -> %d(%f) */\n", + i16, finv, icalc, fsRGB(255*finv)); + } + } + + + printf("/* error: %g - %g, %u (%g%%) of readings inexact */\n", + min_error, max_error, error_count, (100.*error_count)/max_input); + printf("/* 16-bit error: %g - %g, %u (%g%%) of readings inexact */\n", + min_error16, max_error16, error_count16, (100.*error_count16)/65535); + + if (!test_only) + { + printf("PNG_CONST png_uint_16 png_sRGB_table[256] =\n{\n "); + for (i=0; i<255; ) + { + do + { + printf("%d,", png_sRGB_table[i++]); + } + while ((i & 0x7) != 0 && i<255); + if (i<255) printf("\n "); + } + printf("%d\n};\n\n", png_sRGB_table[i]); + + + printf("PNG_CONST png_uint_16 png_sRGB_base[512] =\n{\n "); + for (i=0; i<511; ) + { + do + { + printf("%d,", png_sRGB_base[i++]); + } + while ((i & 0x7) != 0 && i<511); + if (i<511) printf("\n "); + } + printf("%d\n};\n\n", png_sRGB_base[i]); + + printf("PNG_CONST png_byte png_sRGB_delta[512] =\n{\n "); + for (i=0; i<511; ) + { + do + { + printf("%d,", png_sRGB_delta[i++]); + } + while ((i & 0xf) != 0 && i<511); + if (i<511) printf("\n "); + } + printf("%d\n};\n\n", png_sRGB_delta[i]); + } + + return 0; +} diff -ru4NwbB libpng-1.5.13/contrib/tools/sRGB.h libpng-1.6.0beta32/contrib/tools/sRGB.h --- libpng-1.5.13/contrib/tools/sRGB.h 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/contrib/tools/sRGB.h 2012-11-25 12:40:13.102561136 -0600 @@ -0,0 +1,48 @@ +/*- + * sRGB.h + * + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * + * COPYRIGHT: Written by John Cunningham Bowler, 2012. + * To the extent possible under law, the author has waived all copyright and + * related or neighboring rights to this work. This work is published from: + * United States. + * + * Utility file; not actually a header, this contains definitions of sRGB + * calculation functions for inclusion in those test programs that need them. + * + * All routines take and return a floating point value in the range + * 0 to 1.0, doing a calculation according to the sRGB specification + * (in fact the source of the numbers is the wikipedia article at + * http://en.wikipedia.org/wiki/SRGB). + */ +static double +sRGB_from_linear(double l) +{ + if (l <= 0.0031308) + l *= 12.92; + + else + l = 1.055 * pow(l, 1/2.4) - 0.055; + + return l; +} + +static double +linear_from_sRGB(double s) +{ + if (s <= 0.04045) + return s / 12.92; + + else + return pow((s+0.055)/1.055, 2.4); +} + +static double +YfromRGB(double r, double g, double b) +{ + /* Use the sRGB (rounded) coefficients for Rlinear, Glinear, Blinear to get + * the CIE Y value (also linear). + */ + return 0.2126 * r + 0.7152 * g + 0.0722 * b; +} diff -ru4NwbB libpng-1.5.13/example.c libpng-1.6.0beta32/example.c --- libpng-1.5.13/example.c 2012-09-27 06:21:19.653131500 -0500 +++ libpng-1.6.0beta32/example.c 2012-11-25 12:40:10.026936922 -0600 @@ -1,34 +1,216 @@ #if 0 /* in case someone actually tries to compile this */ /* example.c - an example of using libpng - * Last changed in libpng 1.5.10 [March 8, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Maintained 1998-2012 Glenn Randers-Pehrson - * Maintained 1996, 1997 Andreas Dilger - * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc. + * Maintained 1996, 1997 Andreas Dilger) + * Written 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) + * To the extent possible under law, the authors have waived + * all copyright and related or neighboring rights to this file. + * This work is published from: United States. */ /* This is an example of how to use libpng to read and write PNG files. * The file libpng-manual.txt is much more verbose then this. If you have not * read it, do so first. This was designed to be a starting point of an * implementation. This is not officially part of libpng, is hereby placed * in the public domain, and therefore does not require a copyright notice. - * To the extent possible under law, the authors have waived all copyright and - * related or neighboring rights to this file. * * This file does not currently compile, because it is missing certain * parts, like allocating memory to hold an image. You will have to * supply these parts to get it to compile. For an example of a minimal * working PNG reader/writer, see pngtest.c, included in this distribution; * see also the programs in the contrib directory. */ -#define _POSIX_SOURCE 1 /* libpng and zlib are POSIX-compliant. You may - * change this if your application uses non-POSIX - * extensions. */ +/* The simple, but restricted, approach to reading a PNG file or data stream + * just requires two function calls, as in the following complete program. + * Writing a file just needs one function call, so long as the data has an + * appropriate layout. + * + * The following code reads PNG image data from a file and writes it, in a + * potentially new format, to a new file. While this code will compile there is + * minimal (insufficient) error checking; for a more realistic version look at + * contrib/examples/pngtopng.c + */ +#include +#include +#include +#include +#include +#include + +int main(int argc, const char **argv) +{ + if (argc == 3) + { + png_image image; /* The control structure used by libpng */ + + /* Initialize the 'png_image' structure. */ + memset(&image, 0, (sizeof image)); + image.version = PNG_IMAGE_VERSION; + + /* The first argument is the file to read: */ + if (png_image_begin_read_from_file(&image, argv[1])) + { + png_bytep buffer; + + /* Set the format in which to read the PNG file; this code chooses a + * simple sRGB format with a non-associated alpha channel, adequate to + * store most images. + */ + image.format = PNG_FORMAT_RGBA; + + /* Now allocate enough memory to hold the image in this format; the + * PNG_IMAGE_SIZE macro uses the information about the image (width, + * height and format) stored in 'image'. + */ + buffer = malloc(PNG_IMAGE_SIZE(image)); + + /* If enough memory was available read the image in the desired format + * then write the result out to the new file. 'background' is not + * necessary when reading the image because the alpha channel is + * preserved; if it were to be removed, for example if we requested + * PNG_FORMAT_RGB, then either a solid background color would have to + * be supplied or the output buffer would have to be initialized to the + * actual background of the image. + * + * The fourth argument to png_image_finish_read is the 'row_stride' - + * this is the number of components allocated for the image in each + * row. It has to be at least as big as the value returned by + * PNG_IMAGE_ROW_STRIDE, but if you just allocate space for the + * default, minimum, size using PNG_IMAGE_SIZE as above you can pass + * zero. + * + * The final argument is a pointer to a buffer for the colormap; + * colormaps have exactly the same format as a row of image pixels (so + * you choose what format to make the colormap by setting + * image.format). A colormap is only returned if + * PNG_FORMAT_FLAG_COLORMAP is also set in image.format, so in this + * case NULL is passed as the final argument. If you do want to force + * all images into an index/color-mapped format then you can use: + * + * PNG_IMAGE_COLORMAP_SIZE(image) + * + * to find the maximum size of the colormap in bytes. + */ + if (buffer != NULL && + png_image_finish_read(&image, NULL/*background*/, buffer, + 0/*row_stride*/, NULL/*colormap*/)) + { + /* Now write the image out to the second argument. In the write + * call 'convert_to_8bit' allows 16-bit data to be squashed down to + * 8 bits; this isn't necessary here because the original read was + * to the 8-bit format. + */ + if (png_image_write_to_file(&image, argv[2], 0/*convert_to_8bit*/, + buffer, 0/*row_stride*/, NULL/*colormap*/)) + { + /* The image has been written successfully. */ + exit(0); + } + } + + else + { + /* Calling png_free_image is optional unless the simplified API was + * not run to completion. In this case if there wasn't enough + * memory for 'buffer' we didn't complete the read, so we must free + * the image: + */ + if (buffer == NULL) + png_free_image(&image); + + else + free(buffer); + } + + /* Something went wrong reading or writing the image. libpng stores a + * textual message in the 'png_image' structure: + */ + fprintf(stderr, "pngtopng: error: %s\n", image.message); + exit (1); + } + + fprintf(stderr, "pngtopng: usage: pngtopng input-file output-file\n"); + exit(1); +} + +/* That's it ;-) Of course you probably want to do more with PNG files than + * just converting them all to 32-bit RGBA PNG files; you can do that between + * the call to png_image_finish_read and png_image_write_to_file. You can also + * ask for the image data to be presented in a number of different formats. You + * do this by simply changing the 'format' parameter set before allocating the + * buffer. + * + * The format parameter consists of five flags that define various aspects of + * the image, you can simply add these together to get the format or you can use + * one of the predefined macros from png.h (as above): + * + * PNG_FORMAT_FLAG_COLOR: if set the image will have three color components per + * pixel (red, green and blue), if not set the image will just have one + * luminance (grayscale) component. + * + * PNG_FORMAT_FLAG_ALPHA: if set each pixel in the image will have an additional + * alpha value; a linear value that describes the degree the image pixel + * covers (overwrites) the contents of the existing pixel on the display. + * + * PNG_FORMAT_FLAG_LINEAR: if set the components of each pixel will be returned + * as a series of 16-bit linear values, if not set the components will be + * returned as a series of 8-bit values encoded according to the 'sRGB' + * standard. The 8-bit format is the normal format for images intended for + * direct display, because almost all display devices do the inverse of the + * sRGB transformation to the data they receive. The 16-bit format is more + * common for scientific data and image data that must be further processed; + * because it is linear simple math can be done on the component values. + * Regardless of the setting of this flag the alpha channel is always linear, + * although it will be 8 bits or 16 bits wide as specified by the flag. + * + * PNG_FORMAT_FLAG_BGR: if set the components of a color pixel will be returned + * in the order blue, then green, then red. If not set the pixel components + * are in the order red, then green, then blue. + * + * PNG_FORMAT_FLAG_AFIRST: if set the alpha channel (if present) precedes the + * color or grayscale components. If not set the alpha channel follows the + * components. + * + * You do not have to read directly from a file. You can read from memory or, + * on systems that support it, from a FILE*. This is controlled by + * the particular png_image_read_from_ function you call at the start. Likewise + * on write you can write to a FILE* if your system supports it. Check the + * macro PNG_STDIO_SUPPORTED to see if stdio support has been included in your + * libpng build. + * + * If you read 16-bit (PNG_FORMAT_FLAG_LINEAR) data you may need to write it in + * the 8-bit format for display. You do this by setting the convert_to_8bit + * flag to 'true'. + * + * Don't repeatedly convert between the 8-bit and 16-bit forms. There is + * significant data loss when 16-bit data is converted to the 8-bit encoding and + * the current libpng implementation of convertion to 16-bit is also + * significantly lossy. The latter will be fixed in the future, but the former + * is unavoidable - the 8-bit format just doesn't have enough resolution. + */ -#include "png.h" +/* If your program needs more information from the PNG data it reads, or if you + * need to do more complex transformations, or minimise transformations, on the + * data you read, then you must use one of the several lower level libpng + * interfaces. + * + * All these interfaces require that you do your own error handling - your + * program must be able to arrange for control to return to your own code any + * time libpng encounters a problem. There are several ways to do this, but the + * standard way is to use the ANSI-C (C90) interface to establish a + * return point within your own code. You must do this if you do not use the + * simplified interface (above). + * + * The first step is to include the header files you need, including the libpng + * header file. Include any standard headers and feature test macros your + * program requires before including png.h: + */ +#include /* The png_jmpbuf() macro, used in error handling, became available in * libpng version 1.0.6. If you want to be able to run your code with older * versions of libpng, you must define the macro yourself (but only if it @@ -548,9 +730,9 @@ * For the non-NULL rows of interlaced images, you must call * png_progressive_combine_row() passing in the new row and the * old row, as demonstrated above. You can call this function for * NULL rows (it will just return) and for non-interlaced images - * (it just does the png_memcpy for you) if it will make the code + * (it just does the memcpy for you) if it will make the code * easier. Thus, you can just do this for all cases: */ png_progressive_combine_row(png_ptr, old_row, new_row); @@ -663,9 +845,9 @@ PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); /* Set the palette if there is one. REQUIRED for indexed-color images */ palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH - * png_sizeof(png_color)); + * (sizeof (png_color))); /* ... Set palette colors ... */ png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH); /* You must not free palette here, because png_set_PLTE only makes a link to * the palette that you malloced. Wait until you are about to destroy @@ -804,9 +986,9 @@ png_byte image[height*width*bytes_per_pixel]; png_bytep row_pointers[height]; - if (height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) + if (height > PNG_UINT_32_MAX/(sizeof (png_bytep))) png_error (png_ptr, "Image is too tall to process in memory"); /* Set up pointers into your "image" byte array */ for (k = 0; k < height; k++) diff -ru4NwbB libpng-1.5.13/png.c libpng-1.6.0beta32/png.c --- libpng-1.5.13/png.c 2012-09-27 06:21:19.666088149 -0500 +++ libpng-1.6.0beta32/png.c 2012-11-25 12:40:10.043611765 -0600 @@ -1,8 +1,8 @@ /* png.c - location for general purpose libpng functions * - * Last changed in libpng 1.5.11 [June 14, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -23,9 +23,9 @@ */ #ifdef PNG_READ_SUPPORTED void PNGAPI -png_set_sig_bytes(png_structp png_ptr, int num_bytes) +png_set_sig_bytes(png_structrp png_ptr, int num_bytes) { png_debug(1, "in png_set_sig_bytes"); if (png_ptr == NULL) @@ -61,9 +61,9 @@ if (start + num_to_check > 8) num_to_check = 8 - start; - return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check))); + return ((int)(memcmp(&sig[start], &png_signature[start], num_to_check))); } #endif /* PNG_READ_SUPPORTED */ @@ -71,42 +71,36 @@ /* Function to allocate memory for zlib */ PNG_FUNCTION(voidpf /* PRIVATE */, png_zalloc,(voidpf png_ptr, uInt items, uInt size),PNG_ALLOCATED) { - png_voidp ptr; - png_structp p=(png_structp)png_ptr; - png_uint_32 save_flags=p->flags; - png_alloc_size_t num_bytes; + png_alloc_size_t num_bytes = size; if (png_ptr == NULL) - return (NULL); + return NULL; - if (items > PNG_UINT_32_MAX/size) + if (items >= (~(png_alloc_size_t)0)/size) { - png_warning (p, "Potential overflow in png_zalloc()"); - return (NULL); + png_warning (png_voidcast(png_structrp, png_ptr), + "Potential overflow in png_zalloc()"); + return NULL; } - num_bytes = (png_alloc_size_t)items * size; - - p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; - ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes); - p->flags=save_flags; - return ((voidpf)ptr); + num_bytes *= items; + return png_malloc_warn(png_voidcast(png_structrp, png_ptr), num_bytes); } /* Function to free memory for zlib */ void /* PRIVATE */ png_zfree(voidpf png_ptr, voidpf ptr) { - png_free((png_structp)png_ptr, (png_voidp)ptr); + png_free(png_voidcast(png_const_structrp,png_ptr), ptr); } /* Reset the CRC variable to 32 bits of 1's. Care must be taken * in case CRC is > 32 bits to leave the top bits 0. */ void /* PRIVATE */ -png_reset_crc(png_structp png_ptr) +png_reset_crc(png_structrp png_ptr) { /* The cast is safe because the crc is a 32 bit value. */ png_ptr->crc = (png_uint_32)crc32(0, Z_NULL, 0); } @@ -116,9 +110,9 @@ * also check that this data will actually be used before going to the * trouble of calculating it. */ void /* PRIVATE */ -png_calculate_crc(png_structp png_ptr, png_const_bytep ptr, png_size_t length) +png_calculate_crc(png_structrp png_ptr, png_const_bytep ptr, png_size_t length) { int need_crc = 1; if (PNG_CHUNK_ANCILLIARY(png_ptr->chunk_name)) @@ -133,31 +127,31 @@ if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE) need_crc = 0; } - /* 'uLong' is defined as unsigned long, this means that on some systems it is - * a 64 bit value. crc32, however, returns 32 bits so the following cast is - * safe. 'uInt' may be no more than 16 bits, so it is necessary to perform a - * loop here. + /* 'uLong' is defined in zlib.h as unsigned long; this means that on some + * systems it is a 64 bit value. crc32, however, returns 32 bits so the + * following cast is safe. 'uInt' may be no more than 16 bits, so it is + * necessary to perform a loop here. */ if (need_crc && length > 0) { uLong crc = png_ptr->crc; /* Should never issue a warning */ do { - uInt safeLength = (uInt)length; - if (safeLength == 0) - safeLength = (uInt)-1; /* evil, but safe */ + uInt safe_length = (uInt)length; + if (safe_length == 0) + safe_length = (uInt)-1; /* evil, but safe */ - crc = crc32(crc, ptr, safeLength); + crc = crc32(crc, ptr, safe_length); - /* The following should never issue compiler warnings, if they do the + /* The following should never issue compiler warnings; if they do the * target system has characteristics that will probably violate other * assumptions within the libpng code. */ - ptr += safeLength; - length -= safeLength; + ptr += safe_length; + length -= safe_length; } while (length > 0); /* And the following is always safe because the crc is only 32 bits. */ @@ -165,12 +159,12 @@ } } /* Check a user supplied version number, called from both read and write - * functions that create a png_struct + * functions that create a png_struct. */ int -png_user_version_check(png_structp png_ptr, png_const_charp user_png_ver) +png_user_version_check(png_structrp png_ptr, png_const_charp user_png_ver) { if (user_png_ver) { int i = 0; @@ -189,22 +183,25 @@ { /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so * we must recompile any applications that use any older library version. * For versions after libpng 1.0, we will be compatible, so we need - * only check the first digit. + * only check the first and third digits (note that when we reach version + * 1.10 we will need to check the fourth symbol, namely user_png_ver[3]). */ if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] || - (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) || + (user_png_ver[0] == '1' && (user_png_ver[2] != png_libpng_ver[2] || + user_png_ver[3] != png_libpng_ver[3])) || (user_png_ver[0] == '0' && user_png_ver[2] < '9')) { #ifdef PNG_WARNINGS_SUPPORTED size_t pos = 0; char m[128]; - pos = png_safecat(m, sizeof m, pos, "Application built with libpng-"); - pos = png_safecat(m, sizeof m, pos, user_png_ver); - pos = png_safecat(m, sizeof m, pos, " but running with "); - pos = png_safecat(m, sizeof m, pos, png_libpng_ver); + pos = png_safecat(m, (sizeof m), pos, + "Application built with libpng-"); + pos = png_safecat(m, (sizeof m), pos, user_png_ver); + pos = png_safecat(m, (sizeof m), pos, " but running with "); + pos = png_safecat(m, (sizeof m), pos, png_libpng_ver); png_warning(png_ptr, m); #endif @@ -219,45 +216,147 @@ /* Success return. */ return 1; } -/* Allocate the memory for an info_struct for the application. We don't - * really need the png_ptr, but it could potentially be useful in the - * future. This should be used in favour of malloc(png_sizeof(png_info)) - * and png_info_init() so that applications that want to use a shared - * libpng don't have to be recompiled if png_info changes size. +/* Generic function to create a png_struct for either read or write - this + * contains the common initialization. + */ +PNG_FUNCTION(png_structp /* PRIVATE */, +png_create_png_struct,(png_const_charp user_png_ver, png_voidp error_ptr, + png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, + png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) +{ + png_struct create_struct; +# ifdef PNG_SETJMP_SUPPORTED + jmp_buf create_jmp_buf; +# endif + + /* This temporary stack-allocated structure is used to provide a place to + * build enough context to allow the user provided memory allocator (if any) + * to be called. + */ + memset(&create_struct, 0, (sizeof create_struct)); + + /* Added at libpng-1.2.6 */ +# ifdef PNG_USER_LIMITS_SUPPORTED + create_struct.user_width_max = PNG_USER_WIDTH_MAX; + create_struct.user_height_max = PNG_USER_HEIGHT_MAX; + +# ifdef PNG_USER_CHUNK_CACHE_MAX + /* Added at libpng-1.2.43 and 1.4.0 */ + create_struct.user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX; +# endif + +# ifdef PNG_SET_USER_CHUNK_MALLOC_MAX + /* Added at libpng-1.2.43 and 1.4.1, required only for read but exists + * in png_struct regardless. + */ + create_struct.user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX; +# endif +# endif + + /* The following two API calls simply set fields in png_struct, so it is safe + * to do them now even though error handling is not yet set up. + */ +# ifdef PNG_USER_MEM_SUPPORTED + png_set_mem_fn(&create_struct, mem_ptr, malloc_fn, free_fn); +# endif + + /* (*error_fn) can return control to the caller after the error_ptr is set, + * this will result in a memory leak unless the error_fn does something + * extremely sophisticated. The design lacks merit but is implicit in the + * API. + */ + png_set_error_fn(&create_struct, error_ptr, error_fn, warn_fn); + +# ifdef PNG_SETJMP_SUPPORTED + if (!setjmp(create_jmp_buf)) + { + /* Temporarily fake out the longjmp information until we have + * successfully completed this function. This only works if we have + * setjmp() support compiled in, but it is safe - this stuff should + * never happen. + */ + create_struct.jmp_buf_ptr = &create_jmp_buf; + create_struct.jmp_buf_size = 0; /*stack allocation*/ + create_struct.longjmp_fn = longjmp; +# else + { +# endif + /* Call the general version checker (shared with read and write code): + */ + if (png_user_version_check(&create_struct, user_png_ver)) + { + png_structrp png_ptr = png_voidcast(png_structrp, + png_malloc_warn(&create_struct, (sizeof *png_ptr))); + + if (png_ptr != NULL) + { + /* png_ptr->zstream holds a back-pointer to the png_struct, so + * this can only be done now: + */ + create_struct.zstream.zalloc = png_zalloc; + create_struct.zstream.zfree = png_zfree; + create_struct.zstream.opaque = png_ptr; + +# ifdef PNG_SETJMP_SUPPORTED + /* Eliminate the local error handling: */ + create_struct.jmp_buf_ptr = NULL; + create_struct.jmp_buf_size = 0; + create_struct.longjmp_fn = 0; +# endif + + *png_ptr = create_struct; + + /* This is the successful return point */ + return png_ptr; + } + } + } + + /* A longjmp because of a bug in the application storage allocator or a + * simple failure to allocate the png_struct. */ + return NULL; +} + +/* Allocate the memory for an info_struct for the application. */ PNG_FUNCTION(png_infop,PNGAPI -png_create_info_struct,(png_structp png_ptr),PNG_ALLOCATED) +png_create_info_struct,(png_const_structrp png_ptr),PNG_ALLOCATED) { - png_infop info_ptr; + png_inforp info_ptr; png_debug(1, "in png_create_info_struct"); if (png_ptr == NULL) - return (NULL); + return NULL; + + /* Use the internal API that does not (or at least should not) error out, so + * that this call always returns ok. The application typically sets up the + * error handling *after* creating the info_struct because this is the way it + * has always been done in 'example.c'. + */ + info_ptr = png_voidcast(png_inforp, png_malloc_base(png_ptr, + (sizeof *info_ptr))); -#ifdef PNG_USER_MEM_SUPPORTED - info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO, - png_ptr->malloc_fn, png_ptr->mem_ptr); -#else - info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); -#endif if (info_ptr != NULL) - png_info_init_3(&info_ptr, png_sizeof(png_info)); + memset(info_ptr, 0, (sizeof *info_ptr)); - return (info_ptr); + return info_ptr; } /* This function frees the memory associated with a single info struct. * Normally, one would use either png_destroy_read_struct() or * png_destroy_write_struct() to free an info struct, but this may be - * useful for some applications. + * useful for some applications. From libpng 1.6.0 this function is also used + * internally to implement the png_info release part of the 'struct' destroy + * APIs. This ensures that all possible approaches free the same data (all of + * it). */ void PNGAPI -png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr) +png_destroy_info_struct(png_const_structrp png_ptr, png_infopp info_ptr_ptr) { - png_infop info_ptr = NULL; + png_inforp info_ptr = NULL; png_debug(1, "in png_destroy_info_struct"); if (png_ptr == NULL) @@ -267,48 +366,59 @@ info_ptr = *info_ptr_ptr; if (info_ptr != NULL) { - png_info_destroy(png_ptr, info_ptr); - -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn, - png_ptr->mem_ptr); -#else - png_destroy_struct((png_voidp)info_ptr); -#endif + /* Do this first in case of an error below; if the app implements its own + * memory management this can lead to png_free calling png_error, which + * will abort this routine and return control to the app error handler. + * An infinite loop may result if it then tries to free the same info + * ptr. + */ *info_ptr_ptr = NULL; + + png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); + memset(info_ptr, 0, (sizeof *info_ptr)); + png_free(png_ptr, info_ptr); } } /* Initialize the info structure. This is now an internal function (0.89) * and applications using it are urged to use png_create_info_struct() - * instead. - */ - -void PNGAPI -png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size) + * instead. Use deprecated in 1.6.0, internal use removed (used internally it + * is just a memset). + * + * NOTE: it is almost inconceivable that this API is used because it bypasses + * the user-memory mechanism and the user error handling/warning mechanisms in + * those cases where it does anything other than a memset. + */ +PNG_FUNCTION(void,PNGAPI +png_info_init_3,(png_infopp ptr_ptr, png_size_t png_info_struct_size), + PNG_DEPRECATED) { - png_infop info_ptr = *ptr_ptr; + png_inforp info_ptr = *ptr_ptr; png_debug(1, "in png_info_init_3"); if (info_ptr == NULL) return; - if (png_sizeof(png_info) > png_info_struct_size) + if ((sizeof (png_info)) > png_info_struct_size) { - png_destroy_struct(info_ptr); - info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO); + *ptr_ptr = NULL; + /* The following line is why this API should not be used: */ + free(info_ptr); + info_ptr = png_voidcast(png_inforp, png_malloc_base(NULL, + (sizeof *info_ptr))); *ptr_ptr = info_ptr; } /* Set everything to 0 */ - png_memset(info_ptr, 0, png_sizeof(png_info)); + memset(info_ptr, 0, (sizeof *info_ptr)); } +/* The following API is not called internally */ void PNGAPI -png_data_freer(png_structp png_ptr, png_infop info_ptr, +png_data_freer(png_const_structrp png_ptr, png_inforp info_ptr, int freer, png_uint_32 mask) { png_debug(1, "in png_data_freer"); @@ -321,14 +431,13 @@ else if (freer == PNG_USER_WILL_FREE_DATA) info_ptr->free_me &= ~mask; else - png_warning(png_ptr, - "Unknown freer parameter in png_data_freer"); + png_error(png_ptr, "Unknown freer parameter in png_data_freer"); } void PNGAPI -png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask, +png_free_data(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 mask, int num) { png_debug(1, "in png_free_data"); @@ -391,10 +500,10 @@ info_ptr->pcal_purpose = NULL; info_ptr->pcal_units = NULL; if (info_ptr->pcal_params != NULL) { - int i; - for (i = 0; i < (int)info_ptr->pcal_nparams; i++) + unsigned int i; + for (i = 0; i < info_ptr->pcal_nparams; i++) { png_free(png_ptr, info_ptr->pcal_params[i]); info_ptr->pcal_params[i] = NULL; } @@ -405,9 +514,9 @@ } #endif #ifdef PNG_iCCP_SUPPORTED - /* Free any iCCP entry */ + /* Free any profile entry */ if ((mask & PNG_FREE_ICCP) & info_ptr->free_me) { png_free(png_ptr, info_ptr->iccp_name); png_free(png_ptr, info_ptr->iccp_profile); @@ -435,11 +544,11 @@ else { if (info_ptr->splt_palettes_num) { - int i; - for (i = 0; i < (int)info_ptr->splt_palettes_num; i++) - png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i); + unsigned int i; + for (i = 0; i < info_ptr->splt_palettes_num; i++) + png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, (int)i); png_free(png_ptr, info_ptr->splt_palettes); info_ptr->splt_palettes = NULL; info_ptr->splt_palettes_num = 0; @@ -448,15 +557,9 @@ } } #endif -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED - if (png_ptr->unknown_chunk.data) - { - png_free(png_ptr, png_ptr->unknown_chunk.data); - png_ptr->unknown_chunk.data = NULL; - } - +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED if ((mask & PNG_FREE_UNKN) & info_ptr->free_me) { if (num != -1) { @@ -468,14 +571,14 @@ } else { - int i; + unsigned int i; if (info_ptr->unknown_chunks_num) { for (i = 0; i < info_ptr->unknown_chunks_num; i++) - png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i); + png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, (int)i); png_free(png_ptr, info_ptr->unknown_chunks); info_ptr->unknown_chunks = NULL; info_ptr->unknown_chunks_num = 0; @@ -496,9 +599,9 @@ /* Free any PLTE entry that was internally allocated */ if ((mask & PNG_FREE_PLTE) & info_ptr->free_me) { - png_zfree(png_ptr, info_ptr->palette); + png_free(png_ptr, info_ptr->palette); info_ptr->palette = NULL; info_ptr->valid &= ~PNG_INFO_PLTE; info_ptr->num_palette = 0; } @@ -508,10 +611,10 @@ if ((mask & PNG_FREE_ROWS) & info_ptr->free_me) { if (info_ptr->row_pointers) { - int row; - for (row = 0; row < (int)info_ptr->height; row++) + png_uint_32 row; + for (row = 0; row < info_ptr->height; row++) { png_free(png_ptr, info_ptr->row_pointers[row]); info_ptr->row_pointers[row] = NULL; } @@ -526,39 +629,16 @@ mask &= ~PNG_FREE_MUL; info_ptr->free_me &= ~mask; } - -/* This is an internal routine to free any memory that the info struct is - * pointing to before re-using it or freeing the struct itself. Recall - * that png_free() checks for NULL pointers for us. - */ -void /* PRIVATE */ -png_info_destroy(png_structp png_ptr, png_infop info_ptr) -{ - png_debug(1, "in png_info_destroy"); - - png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); - -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - if (png_ptr->num_chunk_list) - { - png_free(png_ptr, png_ptr->chunk_list); - png_ptr->chunk_list = NULL; - png_ptr->num_chunk_list = 0; - } -#endif - - png_info_init_3(&info_ptr, png_sizeof(png_info)); -} #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ /* This function returns a pointer to the io_ptr associated with the user * functions. The application should free any memory associated with this * pointer before png_write_destroy() or png_read_destroy() are called. */ png_voidp PNGAPI -png_get_io_ptr(png_structp png_ptr) +png_get_io_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return (NULL); @@ -573,9 +653,9 @@ * PNG_NO_STDIO or otherwise disabled PNG_STDIO_SUPPORTED, you must use a * function of your own because "FILE *" isn't necessarily available. */ void PNGAPI -png_init_io(png_structp png_ptr, png_FILE_p fp) +png_init_io(png_structrp png_ptr, png_FILE_p fp) { png_debug(1, "in png_init_io"); if (png_ptr == NULL) @@ -584,44 +664,54 @@ png_ptr->io_ptr = (png_voidp)fp; } # endif +#ifdef PNG_SAVE_INT_32_SUPPORTED +/* The png_save_int_32 function assumes integers are stored in two's + * complement format. If this isn't the case, then this routine needs to + * be modified to write data in two's complement format. Note that, + * the following works correctly even if png_int_32 has more than 32 bits + * (compare the more complex code required on read for sign extension.) + */ +void PNGAPI +png_save_int_32(png_bytep buf, png_int_32 i) +{ + buf[0] = (png_byte)((i >> 24) & 0xff); + buf[1] = (png_byte)((i >> 16) & 0xff); + buf[2] = (png_byte)((i >> 8) & 0xff); + buf[3] = (png_byte)(i & 0xff); +} +#endif + # ifdef PNG_TIME_RFC1123_SUPPORTED /* Convert the supplied time into an RFC 1123 string suitable for use in * a "Creation Time" or other text-based time string. */ -png_const_charp PNGAPI -png_convert_to_rfc1123(png_structp png_ptr, png_const_timep ptime) +int PNGAPI +png_convert_to_rfc1123_buffer(char out[29], png_const_timep ptime) { static PNG_CONST char short_months[12][4] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; - if (png_ptr == NULL) - return (NULL); + if (out == NULL) + return 0; if (ptime->year > 9999 /* RFC1123 limitation */ || ptime->month == 0 || ptime->month > 12 || ptime->day == 0 || ptime->day > 31 || ptime->hour > 23 || ptime->minute > 59 || ptime->second > 60) - { - png_warning(png_ptr, "Ignoring invalid time value"); - return (NULL); - } + return 0; { size_t pos = 0; char number_buf[5]; /* enough for a four-digit year */ -# define APPEND_STRING(string)\ - pos = png_safecat(png_ptr->time_buffer, sizeof png_ptr->time_buffer,\ - pos, (string)) +# define APPEND_STRING(string) pos = png_safecat(out, 29, pos, (string)) # define APPEND_NUMBER(format, value)\ APPEND_STRING(PNG_FORMAT_NUMBER(number_buf, format, (value))) -# define APPEND(ch)\ - if (pos < (sizeof png_ptr->time_buffer)-1)\ - png_ptr->time_buffer[pos++] = (ch) +# define APPEND(ch) if (pos < 28) out[pos++] = (ch) APPEND_NUMBER(PNG_NUMBER_FORMAT_u, (unsigned)ptime->day); APPEND(' '); APPEND_STRING(short_months[(ptime->month - 1)]); @@ -639,16 +729,39 @@ # undef APPEND_NUMBER # undef APPEND_STRING } + return 1; +} + +# if PNG_LIBPNG_VER < 10700 +/* To do: remove the following from libpng-1.7 */ +/* Original API that uses a private buffer in png_struct. + * Deprecated because it causes png_struct to carry a spurious temporary + * buffer (png_struct::time_buffer), better to have the caller pass this in. + */ +png_const_charp PNGAPI +png_convert_to_rfc1123(png_structrp png_ptr, png_const_timep ptime) +{ + if (png_ptr != NULL) + { + /* The only failure above if png_ptr != NULL is from an invalid ptime */ + if (!png_convert_to_rfc1123_buffer(png_ptr->time_buffer, ptime)) + png_warning(png_ptr, "Ignoring invalid time value"); + + else return png_ptr->time_buffer; } + + return NULL; +} +# endif # endif /* PNG_TIME_RFC1123_SUPPORTED */ #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ png_const_charp PNGAPI -png_get_copyright(png_const_structp png_ptr) +png_get_copyright(png_const_structrp png_ptr) { PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ #ifdef PNG_STRING_COPYRIGHT return PNG_STRING_COPYRIGHT @@ -677,24 +790,24 @@ * png_get_header_ver(). Due to the version_nn_nn_nn typedef guard, * it is guaranteed that png.c uses the correct version of png.h. */ png_const_charp PNGAPI -png_get_libpng_ver(png_const_structp png_ptr) +png_get_libpng_ver(png_const_structrp png_ptr) { /* Version of *.c files used when building libpng */ return png_get_header_ver(png_ptr); } png_const_charp PNGAPI -png_get_header_ver(png_const_structp png_ptr) +png_get_header_ver(png_const_structrp png_ptr) { /* Version of *.h files used when building libpng */ PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ return PNG_LIBPNG_VER_STRING; } png_const_charp PNGAPI -png_get_header_version(png_const_structp png_ptr) +png_get_header_version(png_const_structrp png_ptr) { /* Returns longer string containing both version and date */ PNG_UNUSED(png_ptr) /* Silence compiler warning about unused png_ptr */ #ifdef __STDC__ @@ -707,54 +820,63 @@ return PNG_HEADER_VERSION_STRING; #endif } -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED int PNGAPI -png_handle_as_unknown(png_structp png_ptr, png_const_bytep chunk_name) +png_handle_as_unknown(png_const_structrp png_ptr, png_const_bytep chunk_name) { /* Check chunk_name and return "keep" value if it's on the list, else 0 */ png_const_bytep p, p_end; - if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list <= 0) + if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list == 0) return PNG_HANDLE_CHUNK_AS_DEFAULT; p_end = png_ptr->chunk_list; p = p_end + png_ptr->num_chunk_list*5; /* beyond end */ /* The code is the fifth byte after each four byte string. Historically this - * code was always searched from the end of the list, so it should continue - * to do so in case there are duplicated entries. + * code was always searched from the end of the list, this is no longer + * necessary because the 'set' routine handles duplicate entries correcty. */ do /* num_chunk_list > 0, so at least one */ { p -= 5; - if (!png_memcmp(chunk_name, p, 4)) + + if (!memcmp(chunk_name, p, 4)) return p[4]; } while (p > p_end); + /* This means that known chunks should be processed and unknown chunks should + * be handled according to the value of png_ptr->unknown_default; this can be + * confusing because, as a result, there are two levels of defaulting for + * unknown chunks. + */ return PNG_HANDLE_CHUNK_AS_DEFAULT; } +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED int /* PRIVATE */ -png_chunk_unknown_handling(png_structp png_ptr, png_uint_32 chunk_name) +png_chunk_unknown_handling(png_const_structrp png_ptr, png_uint_32 chunk_name) { png_byte chunk_string[5]; PNG_CSTRING_FROM_CHUNK(chunk_string, chunk_name); return png_handle_as_unknown(png_ptr, chunk_string); } -#endif +#endif /* READ_UNKNOWN_CHUNKS */ +#endif /* SET_UNKNOWN_CHUNKS */ #ifdef PNG_READ_SUPPORTED /* This function, added to libpng-1.0.6g, is untested. */ int PNGAPI -png_reset_zstream(png_structp png_ptr) +png_reset_zstream(png_structrp png_ptr) { if (png_ptr == NULL) return Z_STREAM_ERROR; + /* WARNING: this resets the window bits to the maximum! */ return (inflateReset(&png_ptr->zstream)); } #endif /* PNG_READ_SUPPORTED */ @@ -768,141 +890,299 @@ #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) +/* Ensure that png_ptr->zstream.msg holds some appropriate error message string. + * If it doesn't 'ret' is used to set it to something appropriate, even in cases + * like Z_OK or Z_STREAM_END where the error code is apparently a success code. + */ +void /* PRIVATE */ +png_zstream_error(png_structrp png_ptr, int ret) +{ + /* Translate 'ret' into an appropriate error string, priority is given to the + * one in zstream if set. This always returns a string, even in cases like + * Z_OK or Z_STREAM_END where the error code is a success code. + */ + if (png_ptr->zstream.msg == NULL) switch (ret) + { + default: + case Z_OK: + png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected zlib return code"); + break; + + case Z_STREAM_END: + /* Normal exit */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected end of LZ stream"); + break; + + case Z_NEED_DICT: + /* This means the deflate stream did not have a dictionary; this + * indicates a bogus PNG. + */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("missing LZ dictionary"); + break; + + case Z_ERRNO: + /* gz APIs only: should not happen */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("zlib IO error"); + break; + + case Z_STREAM_ERROR: + /* internal libpng error */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("bad parameters to zlib"); + break; + + case Z_DATA_ERROR: + png_ptr->zstream.msg = PNGZ_MSG_CAST("damaged LZ stream"); + break; + + case Z_MEM_ERROR: + png_ptr->zstream.msg = PNGZ_MSG_CAST("insufficient memory"); + break; + + case Z_BUF_ERROR: + /* End of input or output; not a problem if the caller is doing + * incremental read or write. + */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("truncated"); + break; + + case Z_VERSION_ERROR: + png_ptr->zstream.msg = PNGZ_MSG_CAST("unsupported zlib version"); + break; + + case PNG_UNEXPECTED_ZLIB_RETURN: + /* Compile errors here mean that zlib now uses the value co-opted in + * pngpriv.h for PNG_UNEXPECTED_ZLIB_RETURN; update the switch above + * and change pngpriv.h. Note that this message is "... return", + * whereas the default/Z_OK one is "... return code". + */ + png_ptr->zstream.msg = PNGZ_MSG_CAST("unexpected zlib return"); + break; + } +} + /* png_convert_size: a PNGAPI but no longer in png.h, so deleted * at libpng 1.5.5! */ /* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */ -# ifdef PNG_CHECK_cHRM_SUPPORTED - -int /* PRIVATE */ -png_check_cHRM_fixed(png_structp png_ptr, - png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, - png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, - png_fixed_point blue_x, png_fixed_point blue_y) +#ifdef PNG_GAMMA_SUPPORTED /* always set if COLORSPACE */ +static int +png_colorspace_check_gamma(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_fixed_point gAMA, int from) + /* This is called to check a new gamma value against an existing one. The + * routine returns false if the new gamma value should not be written. + * + * 'from' says where the new gamma value comes from: + * + * 0: the new gamma value is the libpng estimate for an ICC profile + * 1: the new gamma value comes from a gAMA chunk + * 2: the new gamma value comes from an sRGB chunk + */ { - int ret = 1; - unsigned long xy_hi,xy_lo,yx_hi,yx_lo; - - png_debug(1, "in function png_check_cHRM_fixed"); - - if (png_ptr == NULL) - return 0; + png_fixed_point gtest; - /* (x,y,z) values are first limited to 0..100000 (PNG_FP_1), the white - * y must also be greater than 0. To test for the upper limit calculate - * (PNG_FP_1-y) - x must be <= to this for z to be >= 0 (and the expression - * cannot overflow.) At this point we know x and y are >= 0 and (x+y) is - * <= PNG_FP_1. The previous test on PNG_MAX_UINT_31 is removed because it - * pointless (and it produces compiler warnings!) + if ((colorspace->flags & PNG_COLORSPACE_HAVE_GAMMA) != 0 && + (!png_muldiv(>est, colorspace->gamma, PNG_FP_1, gAMA) || + png_gamma_significant(gtest))) + { + /* Either this is an sRGB image, in which case the calculated gamma + * approximation should match, or this is an image with a profile and the + * value libpng calculates for the gamma of the profile does not match the + * value recorded in the file. The former, sRGB, case is an error, the + * latter is just a warning. */ - if (white_x < 0 || white_y <= 0 || - red_x < 0 || red_y < 0 || - green_x < 0 || green_y < 0 || - blue_x < 0 || blue_y < 0) + if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0 || from == 2) { - png_warning(png_ptr, - "Ignoring attempt to set negative chromaticity value"); - ret = 0; + png_chunk_report(png_ptr, "gamma value does not match sRGB", + PNG_CHUNK_ERROR); + /* Do not overwrite an sRGB value */ + return from == 2; } - /* And (x+y) must be <= PNG_FP_1 (so z is >= 0) */ - if (white_x > PNG_FP_1 - white_y) + + else /* sRGB tag not involved */ { - png_warning(png_ptr, "Invalid cHRM white point"); - ret = 0; + png_chunk_report(png_ptr, "gamma value does not match libpng estimate", + PNG_CHUNK_WARNING); + return from == 1; + } } - if (red_x > PNG_FP_1 - red_y) - { - png_warning(png_ptr, "Invalid cHRM red point"); - ret = 0; + return 1; } - if (green_x > PNG_FP_1 - green_y) +void /* PRIVATE */ +png_colorspace_set_gamma(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_fixed_point gAMA) { - png_warning(png_ptr, "Invalid cHRM green point"); - ret = 0; - } + /* Changed in libpng-1.5.4 to limit the values to ensure overflow can't + * occur. Since the fixed point representation is assymetrical it is + * possible for 1/gamma to overflow the limit of 21474 and this means the + * gamma value must be at least 5/100000 and hence at most 20000.0. For + * safety the limits here are a little narrower. The values are 0.00016 to + * 6250.0, which are truly ridiculous gamma values (and will produce + * displays that are all black or all white.) + * + * In 1.6.0 this test replaces the ones in pngrutil.c, in the gAMA chunk + * handling code, which only required the value to be >0. + */ + png_const_charp errmsg; + + if (gAMA < 16 || gAMA > 625000000) + errmsg = "gamma value out of range"; + +# ifdef PNG_READ_gAMA_SUPPORTED + /* Allow the application to set the gamma value more than once */ + else if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && + (colorspace->flags & PNG_COLORSPACE_FROM_gAMA) != 0) + errmsg = "duplicate"; +# endif + + /* Do nothing if the colorspace is already invalid */ + else if (colorspace->flags & PNG_COLORSPACE_INVALID) + return; - if (blue_x > PNG_FP_1 - blue_y) + else + { + if (png_colorspace_check_gamma(png_ptr, colorspace, gAMA, 1/*from gAMA*/)) { - png_warning(png_ptr, "Invalid cHRM blue point"); - ret = 0; + /* Store this gamma value. */ + colorspace->gamma = gAMA; + colorspace->flags |= + (PNG_COLORSPACE_HAVE_GAMMA | PNG_COLORSPACE_FROM_gAMA); } - png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo); - png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo); + /* At present if the check_gamma test fails the gamma of the colorspace is + * not updated however the colorspace is not invalidated. This + * corresponds to the case where the existing gamma comes from an sRGB + * chunk or profile. An error message has already been output. + */ + return; + } - if (xy_hi == yx_hi && xy_lo == yx_lo) + /* Error exit - errmsg has been set. */ + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_chunk_report(png_ptr, errmsg, PNG_CHUNK_WRITE_ERROR); +} + +void /* PRIVATE */ +png_colorspace_sync_info(png_const_structrp png_ptr, png_inforp info_ptr) +{ + if (info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) { - png_warning(png_ptr, - "Ignoring attempt to set cHRM RGB triangle with zero area"); - ret = 0; + /* Everything is invalid */ + info_ptr->valid &= ~(PNG_INFO_gAMA|PNG_INFO_cHRM|PNG_INFO_sRGB| + PNG_INFO_iCCP); + +# ifdef PNG_COLORSPACE_SUPPORTED + /* Clean up the iCCP profile now if it won't be used. */ + png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, -1/*not used*/); +# else + PNG_UNUSED(png_ptr) +# endif + } + + else + { +# ifdef PNG_COLORSPACE_SUPPORTED + /* Leave the INFO_iCCP flag set if the pngset.c code has already set + * it; this allows a PNG to contain a profile which matches sRGB and + * yet still have that profile retrievable by the application. + */ + if (info_ptr->colorspace.flags & PNG_COLORSPACE_MATCHES_sRGB) + info_ptr->valid |= PNG_INFO_sRGB; + + else + info_ptr->valid &= ~PNG_INFO_sRGB; + + if (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) + info_ptr->valid |= PNG_INFO_cHRM; + + else + info_ptr->valid &= ~PNG_INFO_cHRM; +# endif + + if (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) + info_ptr->valid |= PNG_INFO_gAMA; + + else + info_ptr->valid &= ~PNG_INFO_gAMA; + } } - return ret; +#ifdef PNG_READ_SUPPORTED +void /* PRIVATE */ +png_colorspace_sync(png_const_structrp png_ptr, png_inforp info_ptr) +{ + if (info_ptr == NULL) /* reduce code size; check here not in the caller */ + return; + + info_ptr->colorspace = png_ptr->colorspace; + png_colorspace_sync_info(png_ptr, info_ptr); } -# endif /* PNG_CHECK_cHRM_SUPPORTED */ +#endif +#endif -#ifdef PNG_cHRM_SUPPORTED +#ifdef PNG_COLORSPACE_SUPPORTED /* Added at libpng-1.5.5 to support read and write of true CIEXYZ values for * cHRM, as opposed to using chromaticities. These internal APIs return * non-zero on a parameter error. The X, Y and Z values are required to be * positive and less than 1.0. */ -int png_xy_from_XYZ(png_xy *xy, png_XYZ XYZ) +static int +png_xy_from_XYZ(png_xy *xy, const png_XYZ *XYZ) { png_int_32 d, dwhite, whiteX, whiteY; - d = XYZ.redX + XYZ.redY + XYZ.redZ; - if (!png_muldiv(&xy->redx, XYZ.redX, PNG_FP_1, d)) return 1; - if (!png_muldiv(&xy->redy, XYZ.redY, PNG_FP_1, d)) return 1; + d = XYZ->red_X + XYZ->red_Y + XYZ->red_Z; + if (!png_muldiv(&xy->redx, XYZ->red_X, PNG_FP_1, d)) return 1; + if (!png_muldiv(&xy->redy, XYZ->red_Y, PNG_FP_1, d)) return 1; dwhite = d; - whiteX = XYZ.redX; - whiteY = XYZ.redY; + whiteX = XYZ->red_X; + whiteY = XYZ->red_Y; - d = XYZ.greenX + XYZ.greenY + XYZ.greenZ; - if (!png_muldiv(&xy->greenx, XYZ.greenX, PNG_FP_1, d)) return 1; - if (!png_muldiv(&xy->greeny, XYZ.greenY, PNG_FP_1, d)) return 1; + d = XYZ->green_X + XYZ->green_Y + XYZ->green_Z; + if (!png_muldiv(&xy->greenx, XYZ->green_X, PNG_FP_1, d)) return 1; + if (!png_muldiv(&xy->greeny, XYZ->green_Y, PNG_FP_1, d)) return 1; dwhite += d; - whiteX += XYZ.greenX; - whiteY += XYZ.greenY; + whiteX += XYZ->green_X; + whiteY += XYZ->green_Y; - d = XYZ.blueX + XYZ.blueY + XYZ.blueZ; - if (!png_muldiv(&xy->bluex, XYZ.blueX, PNG_FP_1, d)) return 1; - if (!png_muldiv(&xy->bluey, XYZ.blueY, PNG_FP_1, d)) return 1; + d = XYZ->blue_X + XYZ->blue_Y + XYZ->blue_Z; + if (!png_muldiv(&xy->bluex, XYZ->blue_X, PNG_FP_1, d)) return 1; + if (!png_muldiv(&xy->bluey, XYZ->blue_Y, PNG_FP_1, d)) return 1; dwhite += d; - whiteX += XYZ.blueX; - whiteY += XYZ.blueY; + whiteX += XYZ->blue_X; + whiteY += XYZ->blue_Y; - /* The reference white is simply the same of the end-point (X,Y,Z) vectors, + /* The reference white is simply the sum of the end-point (X,Y,Z) vectors, * thus: */ if (!png_muldiv(&xy->whitex, whiteX, PNG_FP_1, dwhite)) return 1; if (!png_muldiv(&xy->whitey, whiteY, PNG_FP_1, dwhite)) return 1; return 0; } -int png_XYZ_from_xy(png_XYZ *XYZ, png_xy xy) +static int +png_XYZ_from_xy(png_XYZ *XYZ, const png_xy *xy) { png_fixed_point red_inverse, green_inverse, blue_scale; png_fixed_point left, right, denominator; /* Check xy and, implicitly, z. Note that wide gamut color spaces typically * have end points with 0 tristimulus values (these are impossible end * points, but they are used to cover the possible colors.) */ - if (xy.redx < 0 || xy.redx > PNG_FP_1) return 1; - if (xy.redy < 0 || xy.redy > PNG_FP_1-xy.redx) return 1; - if (xy.greenx < 0 || xy.greenx > PNG_FP_1) return 1; - if (xy.greeny < 0 || xy.greeny > PNG_FP_1-xy.greenx) return 1; - if (xy.bluex < 0 || xy.bluex > PNG_FP_1) return 1; - if (xy.bluey < 0 || xy.bluey > PNG_FP_1-xy.bluex) return 1; - if (xy.whitex < 0 || xy.whitex > PNG_FP_1) return 1; - if (xy.whitey < 0 || xy.whitey > PNG_FP_1-xy.whitex) return 1; + if (xy->redx < 0 || xy->redx > PNG_FP_1) return 1; + if (xy->redy < 0 || xy->redy > PNG_FP_1-xy->redx) return 1; + if (xy->greenx < 0 || xy->greenx > PNG_FP_1) return 1; + if (xy->greeny < 0 || xy->greeny > PNG_FP_1-xy->greenx) return 1; + if (xy->bluex < 0 || xy->bluex > PNG_FP_1) return 1; + if (xy->bluey < 0 || xy->bluey > PNG_FP_1-xy->bluex) return 1; + if (xy->whitex < 0 || xy->whitex > PNG_FP_1) return 1; + if (xy->whitey < 0 || xy->whitey > PNG_FP_1-xy->whitex) return 1; /* The reverse calculation is more difficult because the original tristimulus * value had 9 independent values (red,green,blue)x(X,Y,Z) however only 8 * derived values were recorded in the cHRM chunk; @@ -1069,105 +1349,1010 @@ * * The resultant Y coefficients from the chromaticities of some widely used * color space definitions are (to 15 decimal places): * - * sRGB - * 0.212639005871510 0.715168678767756 0.072192315360734 - * Kodak ProPhoto - * 0.288071128229293 0.711843217810102 0.000085653960605 - * Adobe RGB - * 0.297344975250536 0.627363566255466 0.075291458493998 - * Adobe Wide Gamut RGB - * 0.258728243040113 0.724682314948566 0.016589442011321 + * sRGB + * 0.212639005871510 0.715168678767756 0.072192315360734 + * Kodak ProPhoto + * 0.288071128229293 0.711843217810102 0.000085653960605 + * Adobe RGB + * 0.297344975250536 0.627363566255466 0.075291458493998 + * Adobe Wide Gamut RGB + * 0.258728243040113 0.724682314948566 0.016589442011321 + */ + /* By the argument, above overflow should be impossible here. The return + * value of 2 indicates an internal error to the caller. + */ + if (!png_muldiv(&left, xy->greenx-xy->bluex, xy->redy - xy->bluey, 7)) + return 2; + if (!png_muldiv(&right, xy->greeny-xy->bluey, xy->redx - xy->bluex, 7)) + return 2; + denominator = left - right; + + /* Now find the red numerator. */ + if (!png_muldiv(&left, xy->greenx-xy->bluex, xy->whitey-xy->bluey, 7)) + return 2; + if (!png_muldiv(&right, xy->greeny-xy->bluey, xy->whitex-xy->bluex, 7)) + return 2; + + /* Overflow is possible here and it indicates an extreme set of PNG cHRM + * chunk values. This calculation actually returns the reciprocal of the + * scale value because this allows us to delay the multiplication of white-y + * into the denominator, which tends to produce a small number. + */ + if (!png_muldiv(&red_inverse, xy->whitey, denominator, left-right) || + red_inverse <= xy->whitey /* r+g+b scales = white scale */) + return 1; + + /* Similarly for green_inverse: */ + if (!png_muldiv(&left, xy->redy-xy->bluey, xy->whitex-xy->bluex, 7)) + return 2; + if (!png_muldiv(&right, xy->redx-xy->bluex, xy->whitey-xy->bluey, 7)) + return 2; + if (!png_muldiv(&green_inverse, xy->whitey, denominator, left-right) || + green_inverse <= xy->whitey) + return 1; + + /* And the blue scale, the checks above guarantee this can't overflow but it + * can still produce 0 for extreme cHRM values. + */ + blue_scale = png_reciprocal(xy->whitey) - png_reciprocal(red_inverse) - + png_reciprocal(green_inverse); + if (blue_scale <= 0) return 1; + + + /* And fill in the png_XYZ: */ + if (!png_muldiv(&XYZ->red_X, xy->redx, PNG_FP_1, red_inverse)) return 1; + if (!png_muldiv(&XYZ->red_Y, xy->redy, PNG_FP_1, red_inverse)) return 1; + if (!png_muldiv(&XYZ->red_Z, PNG_FP_1 - xy->redx - xy->redy, PNG_FP_1, + red_inverse)) + return 1; + + if (!png_muldiv(&XYZ->green_X, xy->greenx, PNG_FP_1, green_inverse)) return 1; + if (!png_muldiv(&XYZ->green_Y, xy->greeny, PNG_FP_1, green_inverse)) return 1; + if (!png_muldiv(&XYZ->green_Z, PNG_FP_1 - xy->greenx - xy->greeny, PNG_FP_1, + green_inverse)) + return 1; + + if (!png_muldiv(&XYZ->blue_X, xy->bluex, blue_scale, PNG_FP_1)) return 1; + if (!png_muldiv(&XYZ->blue_Y, xy->bluey, blue_scale, PNG_FP_1)) return 1; + if (!png_muldiv(&XYZ->blue_Z, PNG_FP_1 - xy->bluex - xy->bluey, blue_scale, + PNG_FP_1)) + return 1; + + return 0; /*success*/ +} + +static int +png_XYZ_normalize(png_XYZ *XYZ) +{ + png_int_32 Y; + + if (XYZ->red_Y < 0 || XYZ->green_Y < 0 || XYZ->blue_Y < 0 || + XYZ->red_X < 0 || XYZ->green_X < 0 || XYZ->blue_X < 0 || + XYZ->red_Z < 0 || XYZ->green_Z < 0 || XYZ->blue_Z < 0) + return 1; + + /* Normalize by scaling so the sum of the end-point Y values is PNG_FP_1. + * IMPLEMENTATION NOTE: ANSI requires signed overflow not to occur, therefore + * relying on addition of two positive values producing a negative one is not + * safe. + */ + Y = XYZ->red_Y; + if (0x7fffffff - Y < XYZ->green_X) return 1; + Y += XYZ->green_Y; + if (0x7fffffff - Y < XYZ->blue_X) return 1; + Y += XYZ->blue_Y; + + if (Y != PNG_FP_1) + { + if (!png_muldiv(&XYZ->red_X, XYZ->red_X, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->red_Y, XYZ->red_Y, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->red_Z, XYZ->red_Z, PNG_FP_1, Y)) return 1; + + if (!png_muldiv(&XYZ->green_X, XYZ->green_X, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->green_Y, XYZ->green_Y, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->green_Z, XYZ->green_Z, PNG_FP_1, Y)) return 1; + + if (!png_muldiv(&XYZ->blue_X, XYZ->blue_X, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->blue_Y, XYZ->blue_Y, PNG_FP_1, Y)) return 1; + if (!png_muldiv(&XYZ->blue_Z, XYZ->blue_Z, PNG_FP_1, Y)) return 1; + } + + return 0; +} + +static int +png_colorspace_endpoints_match(const png_xy *xy1, const png_xy *xy2, int delta) +{ + /* Allow an error of +/-0.01 (absolute value) on each chromaticity */ + return !(PNG_OUT_OF_RANGE(xy1->whitex, xy2->whitex,delta) || + PNG_OUT_OF_RANGE(xy1->whitey, xy2->whitey,delta) || + PNG_OUT_OF_RANGE(xy1->redx, xy2->redx, delta) || + PNG_OUT_OF_RANGE(xy1->redy, xy2->redy, delta) || + PNG_OUT_OF_RANGE(xy1->greenx, xy2->greenx,delta) || + PNG_OUT_OF_RANGE(xy1->greeny, xy2->greeny,delta) || + PNG_OUT_OF_RANGE(xy1->bluex, xy2->bluex, delta) || + PNG_OUT_OF_RANGE(xy1->bluey, xy2->bluey, delta)); +} + +/* Added in libpng-1.6.0, a different check for the validity of a set of cHRM + * chunk chromaticities. Earlier checks used to simply look for the overflow + * condition (where the determinant of the matrix to solve for XYZ ends up zero + * because the chromaticity values are not all distinct.) Despite this it is + * theoretically possible to produce chromaticities that are apparently valid + * but that rapidly degrade to invalid, potentially crashing, sets because of + * arithmetic inaccuracies when calculations are performed on them. The new + * check is to round-trip xy -> XYZ -> xy and then check that the result is + * within a small percentage of the original. + */ +static int +png_colorspace_check_xy(png_XYZ *XYZ, const png_xy *xy) +{ + int result; + png_xy xy_test; + + /* As a side-effect this routine also returns the XYZ endpoints. */ + result = png_XYZ_from_xy(XYZ, xy); + if (result) return result; + + result = png_xy_from_XYZ(&xy_test, XYZ); + if (result) return result; + + if (png_colorspace_endpoints_match(xy, &xy_test, + 5/*actually, the math is pretty accurate*/)) + return 0; + + /* Too much slip */ + return 1; +} + +/* This is the check going the other way. The XYZ is modified to normalize it + * (another side-effect) and the xy chromaticities are returned. + */ +static int +png_colorspace_check_XYZ(png_xy *xy, png_XYZ *XYZ) +{ + int result; + png_XYZ XYZtemp; + + result = png_XYZ_normalize(XYZ); + if (result) return result; + + result = png_xy_from_XYZ(xy, XYZ); + if (result) return result; + + XYZtemp = *XYZ; + return png_colorspace_check_xy(&XYZtemp, xy); +} + +/* Used to check for an endpoint match against sRGB */ +static const png_xy sRGB_xy = /* From ITU-R BT.709-3 */ +{ + /* color x y */ + /* red */ 64000, 33000, + /* green */ 30000, 60000, + /* blue */ 15000, 6000, + /* white */ 31270, 32900 +}; + +static int +png_colorspace_set_xy_and_XYZ(png_const_structrp png_ptr, + png_colorspacerp colorspace, const png_xy *xy, const png_XYZ *XYZ, + int preferred) +{ + if (colorspace->flags & PNG_COLORSPACE_INVALID) + return 0; + + /* The consistency check is performed on the chromaticities; this factors out + * variations because of the normalization (or not) of the end point Y + * values. + */ + if (preferred < 2 && (colorspace->flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) + { + /* The end points must be reasonably close to any we already have. The + * following allows an error of up to +/-.001 + */ + if (!png_colorspace_endpoints_match(xy, &colorspace->end_points_xy, 100)) + { + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_benign_error(png_ptr, "inconsistent chromaticities"); + return 0; /* failed */ + } + + /* Only overwrite with preferred values */ + if (!preferred) + return 1; /* ok, but no change */ + } + + colorspace->end_points_xy = *xy; + colorspace->end_points_XYZ = *XYZ; + colorspace->flags |= PNG_COLORSPACE_HAVE_ENDPOINTS; + + /* The end points are normally quoted to two decimal digits, so allow +/-0.01 + * on this test. + */ + if (png_colorspace_endpoints_match(xy, &sRGB_xy, 1000)) + colorspace->flags |= PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB; + + else + colorspace->flags &= PNG_COLORSPACE_CANCEL( + PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB); + + return 2; /* ok and changed */ +} + +int /* PRIVATE */ +png_colorspace_set_chromaticities(png_const_structrp png_ptr, + png_colorspacerp colorspace, const png_xy *xy, int preferred) +{ + /* We must check the end points to ensure they are reasonable - in the past + * color management systems have crashed as a result of getting bogus + * colorant values, while this isn't the fault of libpng it is the + * responsibility of libpng because PNG carries the bomb and libpng is in a + * position to protect against it. + */ + png_XYZ XYZ; + + switch (png_colorspace_check_xy(&XYZ, xy)) + { + case 0: /* success */ + return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, xy, &XYZ, + preferred); + + case 1: + /* We can't invert the chromaticities so we can't produce value XYZ + * values. Likely as not a color management system will fail too. + */ + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_benign_error(png_ptr, "invalid chromaticities"); + break; + + default: + /* libpng is broken; this should be a warning but if it happens we + * want error reports so for the moment it is an error. + */ + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_error(png_ptr, "internal error checking chromaticities"); + break; + } + + return 0; /* failed */ +} + +int /* PRIVATE */ +png_colorspace_set_endpoints(png_const_structrp png_ptr, + png_colorspacerp colorspace, const png_XYZ *XYZ_in, int preferred) +{ + png_XYZ XYZ = *XYZ_in; + png_xy xy; + + switch (png_colorspace_check_XYZ(&xy, &XYZ)) + { + case 0: + return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, &xy, &XYZ, + preferred); + + case 1: + /* End points are invalid. */ + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_benign_error(png_ptr, "invalid end points"); + break; + + default: + colorspace->flags |= PNG_COLORSPACE_INVALID; + png_error(png_ptr, "internal error checking chromaticities"); + break; + } + + return 0; /* failed */ +} + +#if defined PNG_sRGB_SUPPORTED || defined PNG_iCCP_SUPPORTED +/* Error message generation */ +static char +png_icc_tag_char(png_uint_32 byte) +{ + byte &= 0xff; + if (byte >= 32 && byte <= 126) + return (char)byte; + else + return '?'; +} + +static void +png_icc_tag_name(char *name, png_uint_32 tag) +{ + name[0] = '\''; + name[1] = png_icc_tag_char(tag >> 24); + name[2] = png_icc_tag_char(tag >> 16); + name[3] = png_icc_tag_char(tag >> 8); + name[4] = png_icc_tag_char(tag ); + name[5] = '\''; +} + +static int +is_ICC_signature_char(png_alloc_size_t it) +{ + return it == 32 || (it >= 48 && it <= 57) || (it >= 65 && it <= 90) || + (it >= 97 && it <= 122); +} + +static int is_ICC_signature(png_alloc_size_t it) +{ + return is_ICC_signature_char(it >> 24) /* checks all the top bits */ && + is_ICC_signature_char((it >> 16) & 0xff) && + is_ICC_signature_char((it >> 8) & 0xff) && + is_ICC_signature_char(it & 0xff); +} + +static int +png_icc_profile_error(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_alloc_size_t value, png_const_charp reason) +{ + size_t pos; + char message[196]; /* see below for calculation */ + + if (colorspace != NULL) + colorspace->flags |= PNG_COLORSPACE_INVALID; + + pos = png_safecat(message, (sizeof message), 0, "profile '"); /* 9 chars */ + pos = png_safecat(message, pos+79, pos, name); /* Truncate to 79 chars */ + pos = png_safecat(message, (sizeof message), pos, "': "); /* +2 = 90 */ + if (is_ICC_signature(value)) + { + /* So 'value' is at most 4 bytes and the following cast is safe */ + png_icc_tag_name(message+pos, (png_uint_32)value); + pos += 6; /* total +8; less than the else clause */ + message[pos++] = ':'; + message[pos++] = ' '; + } +# ifdef PNG_WARNINGS_SUPPORTED + else + { + char number[PNG_NUMBER_BUFFER_SIZE]; /* +24 = 114*/ + + pos = png_safecat(message, (sizeof message), pos, + png_format_number(number, number+(sizeof number), + PNG_NUMBER_FORMAT_x, value)); + pos = png_safecat(message, (sizeof message), pos, "h: "); /*+2 = 116*/ + } +# endif + /* The 'reason' is an arbitrary message, allow +79 maximum 195 */ + pos = png_safecat(message, (sizeof message), pos, reason); + + /* This is recoverable, but make it unconditionally an app_error on write to + * avoid writing invalid ICC profiles into PNG files. (I.e. we handle them + * on read, with a warning, but on write unless the app turns off + * application errors the PNG won't be written.) + */ + png_chunk_report(png_ptr, message, + (colorspace != NULL) ? PNG_CHUNK_ERROR : PNG_CHUNK_WRITE_ERROR); + + return 0; +} +#endif /* sRGB || iCCP */ + +#ifdef PNG_sRGB_SUPPORTED +int /* PRIVATE */ +png_colorspace_set_sRGB(png_const_structrp png_ptr, png_colorspacerp colorspace, + int intent) +{ + /* sRGB sets known gamma, end points and (from the chunk) intent. */ + /* IMPORTANT: these are not necessarily the values found in an ICC profile + * because ICC profiles store values adapted to a D50 environment; it is + * expected that the ICC profile mediaWhitePointTag will be D50, see the + * checks and code elsewhere to understand this better. + * + * These XYZ values, which are accurate to 5dp, produce rgb to gray + * coefficients of (6968,23435,2366), which are reduced (because they add up + * to 32769 not 32768) to (6968,23434,2366). These are the values that + * libpng has traditionally used (and are the best values given the 15bit + * algorithm used by the rgb to gray code.) + */ + static const png_XYZ sRGB_XYZ = /* D65 XYZ (*not* the D50 adapted values!) */ + { + /* color X Y Z */ + /* red */ 41239, 21264, 1933, + /* green */ 35758, 71517, 11919, + /* blue */ 18048, 7219, 95053 + }; + + /* Do nothing if the colorspace is already invalidated. */ + if (colorspace->flags & PNG_COLORSPACE_INVALID) + return 0; + + /* Check the intent, then check for existing settings. It is valid for the + * PNG file to have cHRM or gAMA chunks along with sRGB, but the values must + * be consistent with the correct values. If, however, this function is + * called below because an iCCP chunk matches sRGB then it is quite + * conceivable that an older app recorded incorrect gAMA and cHRM because of + * an incorrect calculation based on the values in the profile - this does + * *not* invalidate the profile (though it still produces an error, which can + * be ignored.) + */ + if (intent < 0 || intent >= PNG_sRGB_INTENT_LAST) + return png_icc_profile_error(png_ptr, colorspace, "sRGB", + (unsigned)intent, "invalid sRGB rendering intent"); + + if ((colorspace->flags & PNG_COLORSPACE_HAVE_INTENT) != 0 && + colorspace->rendering_intent != intent) + return png_icc_profile_error(png_ptr, colorspace, "sRGB", + (unsigned)intent, "inconsistent rendering intents"); + + if ((colorspace->flags & PNG_COLORSPACE_FROM_sRGB) != 0) + { + png_benign_error(png_ptr, "duplicate sRGB information ignored"); + return 0; + } + + /* If the standard sRGB cHRM chunk does not match the one from the PNG file + * warn but overwrite the value with the correct one. + */ + if ((colorspace->flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0 && + !png_colorspace_endpoints_match(&sRGB_xy, &colorspace->end_points_xy, + 100)) + png_chunk_report(png_ptr, "cHRM chunk does not match sRGB", + PNG_CHUNK_ERROR); + + /* This check is just done for the error reporting - the routine always + * returns true when the 'from' argument corresponds to sRGB (2). + */ + (void)png_colorspace_check_gamma(png_ptr, colorspace, PNG_GAMMA_sRGB_INVERSE, + 2/*from sRGB*/); + + /* intent: bugs in GCC force 'int' to be used as the parameter type. */ + colorspace->rendering_intent = (png_uint_16)intent; + colorspace->flags |= PNG_COLORSPACE_HAVE_INTENT; + + /* endpoints */ + colorspace->end_points_xy = sRGB_xy; + colorspace->end_points_XYZ = sRGB_XYZ; + colorspace->flags |= + (PNG_COLORSPACE_HAVE_ENDPOINTS|PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB); + + /* gamma */ + colorspace->gamma = PNG_GAMMA_sRGB_INVERSE; + colorspace->flags |= PNG_COLORSPACE_HAVE_GAMMA; + + /* Finally record that we have an sRGB profile */ + colorspace->flags |= + (PNG_COLORSPACE_MATCHES_sRGB|PNG_COLORSPACE_FROM_sRGB); + + return 1; /* set */ +} +#endif /* sRGB */ + +#ifdef PNG_iCCP_SUPPORTED +/* Encoded value of D50 as an ICC XYZNumber. From the ICC 2010 spec the value + * is XYZ(0.9642,1.0,0.8249), which scales to: + * + * (63189.8112, 65536, 54060.6464) */ - /* By the argument, above overflow should be impossible here. The return - * value of 2 indicates an internal error to the caller. +static const png_byte D50_nCIEXYZ[12] = + { 0x00, 0x00, 0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d }; + +int /* PRIVATE */ +png_icc_check_length(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_uint_32 profile_length) +{ + if (profile_length < 132) + return png_icc_profile_error(png_ptr, colorspace, name, profile_length, + "too short"); + + if (profile_length & 3) + return png_icc_profile_error(png_ptr, colorspace, name, profile_length, + "invalid length"); + + return 1; +} + +int /* PRIVATE */ +png_icc_check_header(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_uint_32 profile_length, + png_const_bytep profile/* first 132 bytes only */, int color_type) +{ + png_uint_32 temp; + + /* Length check; this cannot be ignored in this code because profile_length + * is used later to check the tag table, so even if the profile seems over + * long profile_length from the caller must be correct. The caller can fix + * this up on read or write by just passing in the profile header length. + */ + temp = png_get_uint_32(profile); + if (temp != profile_length) + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "length does not match profile"); + + temp = png_get_uint_32(profile+128); /* tag count: 12 bytes/tag */ + if (temp > 357913930 || /* (2^32-4-132)/12: maxium possible tag count */ + profile_length < 132+12*temp) /* truncated tag table */ + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "tag count too large"); + + /* The 'intent' must be valid or we can't store it, ICC limits the intent to + * 16 bits. + */ + temp = png_get_uint_32(profile+64); + if (temp >= 0xffff) /* The ICC limit */ + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "invalid rendering intent"); + + /* This is just a warning because the profile may be valid in future + * versions. + */ + if (temp >= PNG_sRGB_INTENT_LAST) + (void)png_icc_profile_error(png_ptr, NULL, name, temp, + "intent outside defined range"); + + /* At this point the tag table can't be checked because it hasn't necessarily + * been loaded; however, various header fields can be checked. These checks + * are for values permitted by the PNG spec in an ICC profile; the PNG spec + * restricts the profiles that can be passed in an iCCP chunk (they must be + * appropriate to processing PNG data!) + */ + + /* Data checks (could be skipped). These checks must be independent of the + * version number; however, the version number doesn't accomodate changes in + * the header fields (just the known tags and the interpretation of the + * data.) + */ + temp = png_get_uint_32(profile+36); /* signature 'ascp' */ + if (temp != 0x61637370) + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "invalid signature"); + + /* Currently the PCS illuminant/adopted white point (the computational + * white point) are required to be D50, + * however the profile contains a record of the illuminant so perhaps ICC + * expects to be able to change this in the future (despite the rationale in + * the introduction for using a fixed PCS adopted white.) Consequently the + * following is just a warning. + */ + if (memcmp(profile+68, D50_nCIEXYZ, 12) != 0) + (void)png_icc_profile_error(png_ptr, NULL, name, 0/*no tag value*/, + "PCS illuminant is not D50"); + + /* The PNG spec requires this: + * "If the iCCP chunk is present, the image samples conform to the colour + * space represented by the embedded ICC profile as defined by the + * International Color Consortium [ICC]. The colour space of the ICC profile + * shall be an RGB colour space for colour images (PNG colour types 2, 3, and + * 6), or a greyscale colour space for greyscale images (PNG colour types 0 + * and 4)." + * + * This checking code ensures the embedded profile (on either read or write) + * conforms to the specification requirements. Notice that an ICC 'gray' + * color-space profile contains the information to transform the monochrome + * data to XYZ or L*a*b (according to which PCS the profile uses) and this + * should be used in preference to the standard libpng K channel replication + * into R, G and B channels. + * + * Previously it was suggested that an RGB profile on grayscale data could be + * handled. However it it is clear that using an RGB profile in this context + * must be an error - there is no specification of what it means. Thus it is + * almost certainly more correct to ignore the profile. + */ + temp = png_get_uint_32(profile+16); /* data colour space field */ + switch (temp) + { + case 0x52474220: /* 'RGB ' */ + if (!(color_type & PNG_COLOR_MASK_COLOR)) + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "RGB color space not permitted on grayscale PNG"); + break; + + case 0x47524159: /* 'GRAY' */ + if (color_type & PNG_COLOR_MASK_COLOR) + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "Gray color space not permitted on RGB PNG"); + break; + + default: + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "invalid ICC profile color space"); + } + + /* It is up to the application to check that the profile class matches the + * application requirements; the spec provides no guidance, but it's pretty + * weird if the profile is not scanner ('scnr'), monitor ('mntr'), printer + * ('prtr') or 'spac' (for generic color spaces). Issue a warning in these + * cases. Issue an error for device link or abstract profiles - these don't + * contain the records necessary to transform the color-space to anything + * other than the target device (and not even that for an abstract profile). + * Profiles of these classes may not be embedded in images. + */ + temp = png_get_uint_32(profile+12); /* profile/device class */ + switch (temp) + { + case 0x73636E72: /* 'scnr' */ + case 0x6D6E7472: /* 'mntr' */ + case 0x70727472: /* 'prtr' */ + case 0x73706163: /* 'spac' */ + /* All supported */ + break; + + case 0x61627374: /* 'abst' */ + /* May not be embedded in an image */ + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "invalid embedded Abstract ICC profile"); + + case 0x6C696E6B: /* 'link' */ + /* DeviceLink profiles cannnot be interpreted in a non-device specific + * fashion, if an app uses the AToB0Tag in the profile the results are + * undefined unless the result is sent to the intended device, + * therefore a DeviceLink profile should not be found embedded in a + * PNG. + */ + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "unexpected DeviceLink ICC profile class"); + + case 0x6E6D636C: /* 'nmcl' */ + /* A NamedColor profile is also device specific, however it doesn't + * contain an AToB0 tag that is open to misintrepretation. Almost + * certainly it will fail the tests below. */ - if (!png_muldiv(&left, xy.greenx-xy.bluex, xy.redy - xy.bluey, 7)) return 2; - if (!png_muldiv(&right, xy.greeny-xy.bluey, xy.redx - xy.bluex, 7)) return 2; - denominator = left - right; + (void)png_icc_profile_error(png_ptr, NULL, name, temp, + "unexpected NamedColor ICC profile class"); + break; - /* Now find the red numerator. */ - if (!png_muldiv(&left, xy.greenx-xy.bluex, xy.whitey-xy.bluey, 7)) return 2; - if (!png_muldiv(&right, xy.greeny-xy.bluey, xy.whitex-xy.bluex, 7)) return 2; + default: + /* To allow for future enhancements to the profile accept unrecognized + * profile classes with a warning, these then hit the test below on the + * tag content to ensure they are backward compatible with one of the + * understood profiles. + */ + (void)png_icc_profile_error(png_ptr, NULL, name, temp, + "unrecognized ICC profile class"); + break; + } - /* Overflow is possible here and it indicates an extreme set of PNG cHRM - * chunk values. This calculation actually returns the reciprocal of the - * scale value because this allows us to delay the multiplication of white-y - * into the denominator, which tends to produce a small number. + /* For any profile other than a device link one the PCS must be encoded + * either in XYZ or Lab. */ - if (!png_muldiv(&red_inverse, xy.whitey, denominator, left-right) || - red_inverse <= xy.whitey /* r+g+b scales = white scale */) - return 1; + temp = png_get_uint_32(profile+20); + switch (temp) + { + case 0x58595A20: /* 'XYZ ' */ + case 0x4C616220: /* 'Lab ' */ + break; + + default: + return png_icc_profile_error(png_ptr, colorspace, name, temp, + "unexpected ICC PCS encoding"); + } - /* Similarly for green_inverse: */ - if (!png_muldiv(&left, xy.redy-xy.bluey, xy.whitex-xy.bluex, 7)) return 2; - if (!png_muldiv(&right, xy.redx-xy.bluex, xy.whitey-xy.bluey, 7)) return 2; - if (!png_muldiv(&green_inverse, xy.whitey, denominator, left-right) || - green_inverse <= xy.whitey) return 1; +} - /* And the blue scale, the checks above guarantee this can't overflow but it - * can still produce 0 for extreme cHRM values. +int /* PRIVATE */ +png_icc_check_tag_table(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_uint_32 profile_length, + png_const_bytep profile /* header plus whole tag table */) +{ + png_uint_32 tag_count = png_get_uint_32(profile+128); + png_uint_32 itag; + png_const_bytep tag = profile+132; /* The first tag */ + + /* First scan all the tags in the table and add bits to the icc_info value + * (temporarily in 'tags'). */ - blue_scale = png_reciprocal(xy.whitey) - png_reciprocal(red_inverse) - - png_reciprocal(green_inverse); - if (blue_scale <= 0) return 1; + for (itag=0; itag < tag_count; ++itag, tag += 12) + { + png_uint_32 tag_id = png_get_uint_32(tag+0); + png_uint_32 tag_start = png_get_uint_32(tag+4); /* must be aligned */ + png_uint_32 tag_length = png_get_uint_32(tag+8);/* not padded */ + /* The ICC specification does not exclude zero length tags, therefore the + * start might actually be anywhere if there is no data, but this would be + * a clear abuse of the intent of the standard so the start is checked for + * being in range. All defined tag types have an 8 byte header - a 4 byte + * type signature then 0. + */ + if ((tag_start & 3) != 0) + { + /* CNHP730S.icc shipped with Microsoft Windows 64 violates this, it is + * only a warning here because libpng does not care about the + * alignment. + */ + (void)png_icc_profile_error(png_ptr, NULL, name, tag_id, + "ICC profile tag start not a multiple of 4"); + } - /* And fill in the png_XYZ: */ - if (!png_muldiv(&XYZ->redX, xy.redx, PNG_FP_1, red_inverse)) return 1; - if (!png_muldiv(&XYZ->redY, xy.redy, PNG_FP_1, red_inverse)) return 1; - if (!png_muldiv(&XYZ->redZ, PNG_FP_1 - xy.redx - xy.redy, PNG_FP_1, - red_inverse)) - return 1; + /* This is a hard error; potentially it can cause read outside the + * profile. + */ + if (tag_start > profile_length || tag_length > profile_length - tag_start) + return png_icc_profile_error(png_ptr, colorspace, name, tag_id, + "ICC profile tag outside profile"); + } - if (!png_muldiv(&XYZ->greenX, xy.greenx, PNG_FP_1, green_inverse)) return 1; - if (!png_muldiv(&XYZ->greenY, xy.greeny, PNG_FP_1, green_inverse)) return 1; - if (!png_muldiv(&XYZ->greenZ, PNG_FP_1 - xy.greenx - xy.greeny, PNG_FP_1, - green_inverse)) - return 1; + return 1; /* success, maybe with warnings */ +} - if (!png_muldiv(&XYZ->blueX, xy.bluex, blue_scale, PNG_FP_1)) return 1; - if (!png_muldiv(&XYZ->blueY, xy.bluey, blue_scale, PNG_FP_1)) return 1; - if (!png_muldiv(&XYZ->blueZ, PNG_FP_1 - xy.bluex - xy.bluey, blue_scale, - PNG_FP_1)) - return 1; +#ifdef PNG_sRGB_SUPPORTED +/* Information about the known ICC sRGB profiles */ +static const struct +{ + png_uint_32 adler, crc, length; + png_uint_32 md5[4]; + png_byte have_md5; + png_byte is_broken; + png_uint_16 intent; - return 0; /*success*/ +# define PNG_MD5(a,b,c,d) { a, b, c, d }, (a!=0)||(b!=0)||(c!=0)||(d!=0) +# define PNG_ICC_CHECKSUM(adler, crc, md5, intent, broke, date, length, fname)\ + { adler, crc, length, md5, broke, intent }, + +} png_sRGB_checks[] = +{ + /* This data comes from contrib/tools/checksum-icc run on downloads of + * all four ICC sRGB profiles from www.color.org. + */ + /* adler32, crc32, MD5[4], intent, date, length, file-name */ + PNG_ICC_CHECKSUM(0x0a3fd9f6, 0x3b8772b9, + PNG_MD5(0x29f83dde, 0xaff255ae, 0x7842fae4, 0xca83390d), 0, 0, + "2009/03/27 21:36:31", 3048, "sRGB_IEC61966-2-1_black_scaled.icc") + + /* ICC sRGB v2 perceptual no black-compensation: */ + PNG_ICC_CHECKSUM(0x4909e5e1, 0x427ebb21, + PNG_MD5(0xc95bd637, 0xe95d8a3b, 0x0df38f99, 0xc1320389), 1, 0, + "2009/03/27 21:37:45", 3052, "sRGB_IEC61966-2-1_no_black_scaling.icc") + + PNG_ICC_CHECKSUM(0xfd2144a1, 0x306fd8ae, + PNG_MD5(0xfc663378, 0x37e2886b, 0xfd72e983, 0x8228f1b8), 0, 0, + "2009/08/10 17:28:01", 60988, "sRGB_v4_ICC_preference_displayclass.icc") + + /* ICC sRGB v4 perceptual */ + PNG_ICC_CHECKSUM(0x209c35d2, 0xbbef7812, + PNG_MD5(0x34562abf, 0x994ccd06, 0x6d2c5721, 0xd0d68c5d), 0, 0, + "2007/07/25 00:05:37", 60960, "sRGB_v4_ICC_preference.icc") + + /* The following profiles have no known MD5 checksum. If there is a match + * on the (empty) MD5 the other fields are used to attempt a match and + * a warning is produced. The first two of these profiles have a 'cprt' tag + * which suggests that they were also made by Hewlett Packard. + */ + PNG_ICC_CHECKSUM(0xa054d762, 0x5d5129ce, + PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 1, 0, + "2004/07/21 18:57:42", 3024, "sRGB_IEC61966-2-1_noBPC.icc") + + /* This is a 'mntr' (display) profile with a mediaWhitePointTag that does not + * match the D50 PCS illuminant in the header (it is in fact the D65 values, + * so the white point is recorded as the un-adapted value.) The profiles + * below only differ in one byte - the intent - and are basically the same as + * the previous profile except for the mediaWhitePointTag error and a missing + * chromaticAdaptationTag. + */ + PNG_ICC_CHECKSUM(0xf784f3fb, 0x182ea552, + PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 0, 1/*broken*/, + "1998/02/09 06:49:00", 3144, "HP-Microsoft sRGB v2 perceptual") + + PNG_ICC_CHECKSUM(0x0398f3fcUL, 0xf29e526dUL, + PNG_MD5(0x00000000, 0x00000000, 0x00000000, 0x00000000), 1, 1/*broken*/, + "1998/02/09 06:49:00", 3144, "HP-Microsoft sRGB v2 media-relative") +}; + +static int +png_compare_ICC_profile_with_sRGB(png_const_structrp png_ptr, + png_const_bytep profile, uLong adler) +{ + /* The quick check is to verify just the MD5 signature and trust the + * rest of the data. Because the profile has already been verified for + * correctness this is safe. png_colorspace_set_sRGB will check the 'intent' + * field too, so if the profile has been edited with an intent not defined + * by sRGB (but maybe defined by a later ICC specification) the read of + * the profile will fail at that point. + */ + png_uint_32 length = 0; + png_uint_32 intent = 0x10000; /* invalid */ +#if PNG_sRGB_PROFILE_CHECKS > 1 + uLong crc = 0; /* the value for 0 length data */ +#endif + unsigned int i; + + for (i=0; i < (sizeof png_sRGB_checks) / (sizeof png_sRGB_checks[0]); ++i) + { + if (png_get_uint_32(profile+84) == png_sRGB_checks[i].md5[0] && + png_get_uint_32(profile+88) == png_sRGB_checks[i].md5[1] && + png_get_uint_32(profile+92) == png_sRGB_checks[i].md5[2] && + png_get_uint_32(profile+96) == png_sRGB_checks[i].md5[3]) + { + /* This may be one of the old HP profiles without an MD5, in that + * case we can only use the length and Adler32 (note that these + * are not used by default if there is an MD5!) + */ +# if PNG_sRGB_PROFILE_CHECKS == 0 + if (png_sRGB_checks[i].have_md5) + return 1+png_sRGB_checks[i].is_broken; +# endif + + /* Profile is unsigned or more checks have been configured in. */ + if (length == 0) + { + length = png_get_uint_32(profile); + intent = png_get_uint_32(profile+64); } -int png_XYZ_from_xy_checked(png_structp png_ptr, png_XYZ *XYZ, png_xy xy) + /* Length *and* intent must match */ + if (length == png_sRGB_checks[i].length && + intent == png_sRGB_checks[i].intent) { - switch (png_XYZ_from_xy(XYZ, xy)) + /* Now calculate the alder32 if not done already. */ + if (adler == 0) { - case 0: /* success */ - return 1; + adler = adler32(0, NULL, 0); + adler = adler32(adler, profile, length); + } - case 1: - /* The chunk may be technically valid, but we got png_fixed_point - * overflow while trying to get XYZ values out of it. This is - * entirely benign - the cHRM chunk is pretty extreme. + if (adler == png_sRGB_checks[i].adler) + { + /* These basic checks suggest that the data has not been + * modified, but if the check level is more than 1 perform + * our own crc32 checksum on the data. */ - png_warning(png_ptr, - "extreme cHRM chunk cannot be converted to tristimulus values"); - break; +# if PNG_sRGB_PROFILE_CHECKS > 1 + if (crc == 0) + { + crc = crc32(0, NULL, 0); + crc = crc32(crc, profile, length); + } - default: - /* libpng is broken; this should be a warning but if it happens we - * want error reports so for the moment it is an error. + /* So this check must pass for the 'return' below to happen. */ - png_error(png_ptr, "internal error in png_XYZ_from_xy"); - break; + if (crc == png_sRGB_checks[i].crc) +# endif + { + if (png_sRGB_checks[i].is_broken) + { + /* These profiles are known to have bad data that may cause + * problems if they are used, therefore attempt to + * discourage their use, skip the 'have_md5' warning below, + * which is made irrelevant by this error. + */ + png_chunk_report(png_ptr, "known incorrect sRGB profile", + PNG_CHUNK_ERROR); + } + + /* Warn that this being done; this isn't even an error since + * the profile is perfectly valid, but it would be nice if + * people used the up-to-date ones. + */ + else if (!png_sRGB_checks[i].have_md5) + { + png_chunk_report(png_ptr, + "out-of-date sRGB profile with no signature", + PNG_CHUNK_WARNING); + } + + return 1+png_sRGB_checks[i].is_broken; + } + } + } + +# if PNG_sRGB_PROFILE_CHECKS > 0 + /* The signature matched, but the profile had been changed in some + * way. This is an apparent violation of the ICC terms of use and, + * anyway, probably indicates a data error or uninformed hacking. + */ + if (png_sRGB_checks[i].have_md5) + png_benign_error(png_ptr, + "copyright violation: edited ICC profile ignored"); +# endif + } + } + + return 0; /* no match */ +} +#endif + +#ifdef PNG_sRGB_SUPPORTED +void /* PRIVATE */ +png_icc_set_sRGB(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_const_bytep profile, uLong adler) +{ + /* Is this profile one of the known ICC sRGB profiles? If it is, just set + * the sRGB information. + */ + if (png_compare_ICC_profile_with_sRGB(png_ptr, profile, adler)) + (void)png_colorspace_set_sRGB(png_ptr, colorspace, + (int)/*already checked*/png_get_uint_32(profile+64)); +} +#endif /* PNG_READ_sRGB_SUPPORTED */ + +int /* PRIVATE */ +png_colorspace_set_ICC(png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_charp name, png_uint_32 profile_length, png_const_bytep profile, + int color_type) +{ + if (colorspace->flags & PNG_COLORSPACE_INVALID) + return 0; + + if (png_icc_check_length(png_ptr, colorspace, name, profile_length) && + png_icc_check_header(png_ptr, colorspace, name, profile_length, profile, + color_type) && + png_icc_check_tag_table(png_ptr, colorspace, name, profile_length, + profile)) + { + png_icc_set_sRGB(png_ptr, colorspace, profile, 0); + return 1; } - /* ERROR RETURN */ + /* Failure case */ return 0; } +#endif /* iCCP */ + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +void /* PRIVATE */ +png_colorspace_set_rgb_coefficients(png_structrp png_ptr) +{ + /* Set the rgb_to_gray coefficients from the colorspace. */ + if (!png_ptr->rgb_to_gray_coefficients_set && + (png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS) != 0) + { + /* png_set_background has not been called, get the coefficients from the Y + * values of the colorspace colorants. + */ + png_fixed_point r = png_ptr->colorspace.end_points_XYZ.red_Y; + png_fixed_point g = png_ptr->colorspace.end_points_XYZ.green_Y; + png_fixed_point b = png_ptr->colorspace.end_points_XYZ.blue_Y; + png_fixed_point total = r+g+b; + + if (total > 0 && + r >= 0 && png_muldiv(&r, r, 32768, total) && r >= 0 && r <= 32768 && + g >= 0 && png_muldiv(&g, g, 32768, total) && g >= 0 && g <= 32768 && + b >= 0 && png_muldiv(&b, b, 32768, total) && b >= 0 && b <= 32768 && + r+g+b <= 32769) + { + /* We allow 0 coefficients here. r+g+b may be 32769 if two or + * all of the coefficients were rounded up. Handle this by + * reducing the *largest* coefficient by 1; this matches the + * approach used for the default coefficients in pngrtran.c + */ + int add = 0; + + if (r+g+b > 32768) + add = -1; + else if (r+g+b < 32768) + add = 1; + + if (add != 0) + { + if (g >= r && g >= b) + g += add; + else if (r >= g && r >= b) + r += add; + else + b += add; + } + + /* Check for an internal error. */ + if (r+g+b != 32768) + png_error(png_ptr, + "internal error handling cHRM coefficients"); + + else + { + png_ptr->rgb_to_gray_red_coeff = (png_uint_16)r; + png_ptr->rgb_to_gray_green_coeff = (png_uint_16)g; + } + } + + /* This is a png_error at present even though it could be ignored - + * it should never happen, but it is important that if it does, the + * bug is fixed. + */ + else + png_error(png_ptr, "internal error handling cHRM->XYZ"); + } +} #endif +#endif /* COLORSPACE */ + void /* PRIVATE */ -png_check_IHDR(png_structp png_ptr, +png_check_IHDR(png_const_structrp png_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_type, int compression_type, int filter_type) { @@ -1457,18 +2642,18 @@ return 0; /* i.e. fail */ } #endif /* pCAL or sCAL */ -#ifdef PNG_READ_sCAL_SUPPORTED +#ifdef PNG_sCAL_SUPPORTED # ifdef PNG_FLOATING_POINT_SUPPORTED /* Utility used below - a simple accurate power of ten from an integral * exponent. */ static double png_pow10(int power) { int recip = 0; - double d = 1.0; + double d = 1; /* Handle negative exponent with a reciprocal at the end because * 10 is exact whereas .1 is inexact in base 2 */ @@ -1480,9 +2665,9 @@ if (power > 0) { /* Decompose power bitwise. */ - double mult = 10.0; + double mult = 10; do { if (power & 1) d *= mult; mult *= mult; @@ -1500,9 +2685,9 @@ /* Function to format a floating point value in ASCII with a given * precision. */ void /* PRIVATE */ -png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size, +png_ascii_from_fp(png_const_structrp png_ptr, png_charp ascii, png_size_t size, double fp, unsigned int precision) { /* We use standard functions from math.h, but not printf because * that would require stdio. The caller must supply a buffer of @@ -1599,10 +2784,9 @@ do { double d; - fp *= 10.0; - + fp *= 10; /* Use modf here, not floor and subtract, so that * the separation is done in one step. At the end * of the loop don't break the number into parts so * that the final digit is rounded. @@ -1613,9 +2797,9 @@ else { d = floor(fp + .5); - if (d > 9.0) + if (d > 9) { /* Rounding up to 10, handle that here. */ if (czero > 0) { @@ -1621,12 +2805,11 @@ { --czero, d = 1; if (cdigits == 0) --clead; } - else { - while (cdigits > 0 && d > 9.0) + while (cdigits > 0 && d > 9) { int ch = *--ascii; if (exp_b10 != (-1)) @@ -1649,9 +2832,9 @@ /* Did we reach the beginning? If so adjust the * exponent but take into account the leading * decimal point. */ - if (d > 9.0) /* cdigits == 0 */ + if (d > 9) /* cdigits == 0 */ { if (exp_b10 == (-1)) { /* Leading decimal point (plus zeros?), if @@ -1670,16 +2853,16 @@ else ++exp_b10; /* In all cases we output a '1' */ - d = 1.0; + d = 1; } } } fp = 0; /* Guarantees termination below. */ } - if (d == 0.0) + if (d == 0) { ++czero; if (cdigits == 0) ++clead; } @@ -1818,10 +2999,10 @@ # ifdef PNG_FIXED_POINT_SUPPORTED /* Function to format a fixed point value in ASCII. */ void /* PRIVATE */ -png_ascii_from_fixed(png_structp png_ptr, png_charp ascii, png_size_t size, - png_fixed_point fp) +png_ascii_from_fixed(png_const_structrp png_ptr, png_charp ascii, + png_size_t size, png_fixed_point fp) { /* Require space for 10 decimal digits, a decimal point, a minus sign and a * trailing \0, 13 characters: */ @@ -1889,11 +3070,16 @@ # endif /* FIXED_POINT */ #endif /* READ_SCAL */ #if defined(PNG_FLOATING_POINT_SUPPORTED) && \ - !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) + !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ + (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ + defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ + (defined(PNG_sCAL_SUPPORTED) && \ + defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) png_fixed_point -png_fixed(png_structp png_ptr, double fp, png_const_charp text) +png_fixed(png_const_structrp png_ptr, double fp, png_const_charp text) { double r = floor(100000 * fp + .5); if (r > 2147483647. || r < -2147483648.) @@ -2030,9 +3216,9 @@ /* The following is for when the caller doesn't much care about the * result. */ png_fixed_point -png_muldiv_warn(png_structp png_ptr, png_fixed_point a, png_int_32 times, +png_muldiv_warn(png_const_structrp png_ptr, png_fixed_point a, png_int_32 times, png_int_32 divisor) { png_fixed_point result; @@ -2043,9 +3229,9 @@ return 0; } #endif -#ifdef PNG_READ_GAMMA_SUPPORTED /* more fixed point functions for gamma */ +#ifdef PNG_GAMMA_SUPPORTED /* more fixed point functions for gamma */ /* Calculate a reciprocal, return 0 on div-by-zero or overflow. */ png_fixed_point png_reciprocal(png_fixed_point a) { @@ -2063,8 +3249,20 @@ return 0; /* error/overflow */ } +/* This is the shared test on whether a gamma value is 'significant' - whether + * it is worth doing gamma correction. + */ +int /* PRIVATE */ +png_gamma_significant(png_fixed_point gamma_val) +{ + return gamma_val < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED || + gamma_val > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED; +} +#endif + +#ifdef PNG_READ_GAMMA_SUPPORTED /* A local convenience routine. */ static png_fixed_point png_product2(png_fixed_point a, png_fixed_point b) { @@ -2113,75 +3311,30 @@ return 0; /* overflow */ } #endif /* READ_GAMMA */ -#ifdef PNG_CHECK_cHRM_SUPPORTED -/* Added at libpng version 1.2.34 (Dec 8, 2008) and 1.4.0 (Jan 2, - * 2010: moved from pngset.c) */ -/* - * Multiply two 32-bit numbers, V1 and V2, using 32-bit - * arithmetic, to produce a 64-bit result in the HI/LO words. - * - * A B - * x C D - * ------ - * AD || BD - * AC || CB || 0 - * - * where A and B are the high and low 16-bit words of V1, - * C and D are the 16-bit words of V2, AD is the product of - * A and D, and X || Y is (X << 16) + Y. -*/ - -void /* PRIVATE */ -png_64bit_product (long v1, long v2, unsigned long *hi_product, - unsigned long *lo_product) -{ - int a, b, c, d; - long lo, hi, x, y; - - a = (v1 >> 16) & 0xffff; - b = v1 & 0xffff; - c = (v2 >> 16) & 0xffff; - d = v2 & 0xffff; - - lo = b * d; /* BD */ - x = a * d + c * b; /* AD + CB */ - y = ((lo >> 16) & 0xffff) + x; - - lo = (lo & 0xffff) | ((y & 0xffff) << 16); - hi = (y >> 16) & 0xffff; - - hi += a * c; /* AC */ - - *hi_product = (unsigned long)hi; - *lo_product = (unsigned long)lo; -} -#endif /* CHECK_cHRM */ - #ifdef PNG_READ_GAMMA_SUPPORTED /* gamma table code */ #ifndef PNG_FLOATING_ARITHMETIC_SUPPORTED /* Fixed point gamma. * + * The code to calculate the tables used below can be found in the shell script + * contrib/tools/intgamma.sh + * * To calculate gamma this code implements fast log() and exp() calls using only * fixed point arithmetic. This code has sufficient precision for either 8-bit * or 16-bit sample values. * * The tables used here were calculated using simple 'bc' programs, but C double - * precision floating point arithmetic would work fine. The programs are given - * at the head of each table. + * precision floating point arithmetic would work fine. * * 8-bit log table * This is a table of -log(value/255)/log(2) for 'value' in the range 128 to * 255, so it's the base 2 logarithm of a normalized 8-bit floating point * mantissa. The numbers are 32-bit fractions. */ -static png_uint_32 +static const png_uint_32 png_8bit_l2[128] = { -# ifdef PNG_DO_BC - for (i=128;i<256;++i) { .5 - l(i/255)/l(2)*65536*65536; } -# else 4270715492U, 4222494797U, 4174646467U, 4127164793U, 4080044201U, 4033279239U, 3986864580U, 3940795015U, 3895065449U, 3849670902U, 3804606499U, 3759867474U, 3715449162U, 3671346997U, 3627556511U, 3584073329U, 3540893168U, 3498011834U, 3455425220U, 3413129301U, 3371120137U, 3329393864U, 3287946700U, 3246774933U, @@ -2202,9 +3355,8 @@ 479792461U, 453592303U, 427502463U, 401522014U, 375650043U, 349885648U, 324227938U, 298676034U, 273229066U, 247886176U, 222646516U, 197509248U, 172473545U, 147538590U, 122703574U, 97967701U, 73330182U, 48790236U, 24347096U, 0U -# endif #if 0 /* The following are the values for 16-bit tables - these work fine for the * 8-bit conversions but produce very slightly larger errors in the 16-bit @@ -2225,20 +3377,20 @@ 1119, 744, 372 #endif }; -PNG_STATIC png_int_32 +static png_int_32 png_log8bit(unsigned int x) { unsigned int lg2 = 0; /* Each time 'x' is multiplied by 2, 1 must be subtracted off the final log, * because the log is actually negate that means adding 1. The final * returned value thus has the range 0 (for 255 input) to 7.994 (for 1 - * input), return 7.99998 for the overflow (log 0) case - so the result is + * input), return -1 for the overflow (log 0) case, - so the result is * always at most 19 bits. */ if ((x &= 0xff) == 0) - return 0xffffffff; + return -1; if ((x & 0xf0) == 0) lg2 = 4, x <<= 4; @@ -2281,16 +3433,16 @@ * Start (256): -23591 * Zero (257): 0 * End (258): 23499 */ -PNG_STATIC png_int_32 +static png_int_32 png_log16bit(png_uint_32 x) { unsigned int lg2 = 0; /* As above, but now the input has 16 bits. */ if ((x &= 0xffff) == 0) - return 0xffffffff; + return -1; if ((x & 0xff00) == 0) lg2 = 8, x <<= 8; @@ -2338,31 +3490,27 @@ * each case only the low 16 bits are relevant - the fraction - since the * integer bits (the top 4) simply determine a shift. * * The worst case is the 16-bit distinction between 65535 and 65534, this - * requires perhaps spurious accuracy in the decoding of the logarithm to + * requires perhaps spurious accuracty in the decoding of the logarithm to * distinguish log2(65535/65534.5) - 10^-5 or 17 bits. There is little chance * of getting this accuracy in practice. * * To deal with this the following exp() function works out the exponent of the * frational part of the logarithm by using an accurate 32-bit value from the * top four fractional bits then multiplying in the remaining bits. */ -static png_uint_32 +static const png_uint_32 png_32bit_exp[16] = { -# ifdef PNG_DO_BC - for (i=0;i<16;++i) { .5 + e(-i/16*l(2))*2^32; } -# else /* NOTE: the first entry is deliberately set to the maximum 32-bit value. */ 4294967295U, 4112874773U, 3938502376U, 3771522796U, 3611622603U, 3458501653U, 3311872529U, 3171459999U, 3037000500U, 2908241642U, 2784941738U, 2666869345U, 2553802834U, 2445529972U, 2341847524U, 2242560872U -# endif }; /* Adjustment table; provided to explain the numbers in the code below. */ -#ifdef PNG_DO_BC +#if 0 for (i=11;i>=0;--i){ print i, " ", (1 - e(-(2^i)/65536*l(2))) * 2^(32-i), "\n"} 11 44937.64284865548751208448 10 45180.98734845585101160448 9 45303.31936980687359311872 @@ -2376,9 +3524,9 @@ 1 45425.61317555035558641664 0 45425.85339951654943850496 #endif -PNG_STATIC png_uint_32 +static png_uint_32 png_exp(png_fixed_point x) { if (x > 0 && x <= 0xfffff) /* Else overflow or zero (underflow) */ { @@ -2424,9 +3572,9 @@ /* Else underflow */ return 0; } -PNG_STATIC png_byte +static png_byte png_exp8bit(png_fixed_point lg2) { /* Get a 32-bit value: */ png_uint_32 x = png_exp(lg2); @@ -2438,9 +3586,9 @@ x -= x >> 8; return (png_byte)((x + 0x7fffffU) >> 24); } -PNG_STATIC png_uint_16 +static png_uint_16 png_exp16bit(png_fixed_point lg2) { /* Get a 32-bit value: */ png_uint_32 x = png_exp(lg2); @@ -2502,9 +3650,9 @@ * is nominally a 16-bit value if bit depth is 8 then the result is * 8-bit (as are the arguments.) */ png_uint_16 /* PRIVATE */ -png_gamma_correct(png_structp png_ptr, unsigned int value, +png_gamma_correct(png_structrp png_ptr, unsigned int value, png_fixed_point gamma_val) { if (png_ptr->bit_depth == 8) return png_gamma_8bit_correct(value, gamma_val); @@ -2512,28 +3660,18 @@ else return png_gamma_16bit_correct(value, gamma_val); } -/* This is the shared test on whether a gamma value is 'significant' - whether - * it is worth doing gamma correction. - */ -int /* PRIVATE */ -png_gamma_significant(png_fixed_point gamma_val) -{ - return gamma_val < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED || - gamma_val > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED; -} - /* Internal function to build a single 16-bit table - the table consists of - * 'num' 256-entry subtables, where 'num' is determined by 'shift' - the amount + * 'num' 256 entry subtables, where 'num' is determined by 'shift' - the amount * to shift the input values right (or 16-number_of_signifiant_bits). * * The caller is responsible for ensuring that the table gets cleaned up on * png_error (i.e. if one of the mallocs below fails) - i.e. the *table argument * should be somewhere that will be cleaned. */ static void -png_build_16bit_table(png_structp png_ptr, png_uint_16pp *ptable, +png_build_16bit_table(png_structrp png_ptr, png_uint_16pp *ptable, PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val) { /* Various values derived from 'shift': */ PNG_CONST unsigned int num = 1U << (8U - shift); @@ -2541,14 +3679,14 @@ PNG_CONST unsigned int max_by_2 = 1U << (15U-shift); unsigned int i; png_uint_16pp table = *ptable = - (png_uint_16pp)png_calloc(png_ptr, num * png_sizeof(png_uint_16p)); + (png_uint_16pp)png_calloc(png_ptr, num * (sizeof (png_uint_16p))); for (i = 0; i < num; i++) { png_uint_16p sub_table = table[i] = - (png_uint_16p)png_malloc(png_ptr, 256 * png_sizeof(png_uint_16)); + (png_uint_16p)png_malloc(png_ptr, 256 * (sizeof (png_uint_16))); /* The 'threshold' test is repeated here because it can arise for one of * the 16-bit tables even if the others don't hit it. */ @@ -2599,26 +3737,26 @@ /* NOTE: this function expects the *inverse* of the overall gamma transformation * required. */ static void -png_build_16to8_table(png_structp png_ptr, png_uint_16pp *ptable, +png_build_16to8_table(png_structrp png_ptr, png_uint_16pp *ptable, PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val) { PNG_CONST unsigned int num = 1U << (8U - shift); PNG_CONST unsigned int max = (1U << (16U - shift))-1U; unsigned int i; png_uint_32 last; png_uint_16pp table = *ptable = - (png_uint_16pp)png_calloc(png_ptr, num * png_sizeof(png_uint_16p)); + (png_uint_16pp)png_calloc(png_ptr, num * (sizeof (png_uint_16p))); - /* 'num' is the number of tables and also the number of low bits of the - * input 16-bit value used to select a table. Each table is itself indexed - * by the high 8 bits of the value. + /* 'num' is the number of tables and also the number of low bits of low + * bits of the input 16-bit value used to select a table. Each table is + * itself index by the high 8 bits of the value. */ for (i = 0; i < num; i++) table[i] = (png_uint_16p)png_malloc(png_ptr, - 256 * png_sizeof(png_uint_16)); + 256 * (sizeof (png_uint_16))); /* 'gamma_val' is set to the reciprocal of the value calculated above, so * pow(out,g) is an *input* value. 'last' is the last input value set. * @@ -2663,12 +3801,12 @@ } /* Build a single 8-bit table: same as the 16-bit case but much simpler (and * typically much faster). Note that libpng currently does no sBIT processing - * (apparently contrary to the spec) so a 256-entry table is always generated. + * (apparently contrary to the spec) so a 256 entry table is always generated. */ static void -png_build_8bit_table(png_structp png_ptr, png_bytepp ptable, +png_build_8bit_table(png_structrp png_ptr, png_bytepp ptable, PNG_CONST png_fixed_point gamma_val) { unsigned int i; png_bytep table = *ptable = (png_bytep)png_malloc(png_ptr, 256); @@ -2683,9 +3821,9 @@ /* Used from png_read_destroy and below to release the memory used by the gamma * tables. */ void /* PRIVATE */ -png_destroy_gamma_table(png_structp png_ptr) +png_destroy_gamma_table(png_structrp png_ptr) { png_free(png_ptr, png_ptr->gamma_table); png_ptr->gamma_table = NULL; @@ -2739,9 +3877,9 @@ * the future. Note also how the gamma_16 tables are segmented so that * we don't need to allocate > 64K chunks for a full 16-bit table. */ void /* PRIVATE */ -png_build_gamma_table(png_structp png_ptr, int bit_depth) +png_build_gamma_table(png_structrp png_ptr, int bit_depth) { png_debug(1, "in png_build_gamma_table"); /* Remove any existing table; this copes with multiple calls to @@ -2758,22 +3896,22 @@ if (bit_depth <= 8) { png_build_8bit_table(png_ptr, &png_ptr->gamma_table, - png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->gamma, + png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->colorspace.gamma, png_ptr->screen_gamma) : PNG_FP_1); #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) if (png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) { png_build_8bit_table(png_ptr, &png_ptr->gamma_to_1, - png_reciprocal(png_ptr->gamma)); + png_reciprocal(png_ptr->colorspace.gamma)); png_build_8bit_table(png_ptr, &png_ptr->gamma_from_1, png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) : - png_ptr->gamma/* Probably doing rgb_to_gray */); + png_ptr->colorspace.gamma/* Probably doing rgb_to_gray */); } #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ } else @@ -2799,9 +3937,9 @@ * * Where 'iv' is the input color value and 'ov' is the output value - * pow(iv, gamma). * - * Thus the gamma table consists of up to 256 256-entry tables. The table + * Thus the gamma table consists of up to 256 256 entry tables. The table * is selected by the (8-gamma_shift) most significant of the low 8 bits of * the color value then indexed by the upper 8 bits: * * table[low bits][high 8 bits] @@ -2840,15 +3978,15 @@ */ if (png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8)) #endif png_build_16to8_table(png_ptr, &png_ptr->gamma_16_table, shift, - png_ptr->screen_gamma > 0 ? png_product2(png_ptr->gamma, + png_ptr->screen_gamma > 0 ? png_product2(png_ptr->colorspace.gamma, png_ptr->screen_gamma) : PNG_FP_1); #ifdef PNG_16BIT_SUPPORTED else png_build_16bit_table(png_ptr, &png_ptr->gamma_16_table, shift, - png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->gamma, + png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->colorspace.gamma, png_ptr->screen_gamma) : PNG_FP_1); #endif #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ @@ -2856,19 +3994,279 @@ defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) if (png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY)) { png_build_16bit_table(png_ptr, &png_ptr->gamma_16_to_1, shift, - png_reciprocal(png_ptr->gamma)); + png_reciprocal(png_ptr->colorspace.gamma)); /* Notice that the '16 from 1' table should be full precision, however * the lookup on this table still uses gamma_shift, so it can't be. * TODO: fix this. */ png_build_16bit_table(png_ptr, &png_ptr->gamma_16_from_1, shift, png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) : - png_ptr->gamma/* Probably doing rgb_to_gray */); + png_ptr->colorspace.gamma/* Probably doing rgb_to_gray */); } #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ } } #endif /* READ_GAMMA */ + +/* sRGB support */ +#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\ + defined PNG_SIMPLIFIED_WRITE_SUPPORTED +/* sRGB conversion tables; these are machine generated with the code in + * contrib/tools/makesRGB.c. The actual sRGB transfer curve defined in the + * specification (see the article at http://en.wikipedia.org/wiki/SRGB) + * is used, not the gamma=1/2.2 approximation use elsewhere in libpng. + * The sRGB to linear table is exact (to the nearest 16 bit linear fraction). + * The inverse (linear to sRGB) table has accuracies as follows: + * + * For all possible (255*65535+1) input values: + * + * error: -0.515566 - 0.625971, 79441 (0.475369%) of readings inexact + * + * For the input values corresponding to the 65536 16-bit values: + * + * error: -0.513727 - 0.607759, 308 (0.469978%) of readings inexact + * + * In all cases the inexact readings are off by one. + */ + +#ifdef PNG_SIMPLIFIED_READ_SUPPORTED +/* The convert-to-sRGB table is only currently required for read. */ +const png_uint_16 png_sRGB_table[256] = +{ + 0,20,40,60,80,99,119,139, + 159,179,199,219,241,264,288,313, + 340,367,396,427,458,491,526,562, + 599,637,677,718,761,805,851,898, + 947,997,1048,1101,1156,1212,1270,1330, + 1391,1453,1517,1583,1651,1720,1790,1863, + 1937,2013,2090,2170,2250,2333,2418,2504, + 2592,2681,2773,2866,2961,3058,3157,3258, + 3360,3464,3570,3678,3788,3900,4014,4129, + 4247,4366,4488,4611,4736,4864,4993,5124, + 5257,5392,5530,5669,5810,5953,6099,6246, + 6395,6547,6700,6856,7014,7174,7335,7500, + 7666,7834,8004,8177,8352,8528,8708,8889, + 9072,9258,9445,9635,9828,10022,10219,10417, + 10619,10822,11028,11235,11446,11658,11873,12090, + 12309,12530,12754,12980,13209,13440,13673,13909, + 14146,14387,14629,14874,15122,15371,15623,15878, + 16135,16394,16656,16920,17187,17456,17727,18001, + 18277,18556,18837,19121,19407,19696,19987,20281, + 20577,20876,21177,21481,21787,22096,22407,22721, + 23038,23357,23678,24002,24329,24658,24990,25325, + 25662,26001,26344,26688,27036,27386,27739,28094, + 28452,28813,29176,29542,29911,30282,30656,31033, + 31412,31794,32179,32567,32957,33350,33745,34143, + 34544,34948,35355,35764,36176,36591,37008,37429, + 37852,38278,38706,39138,39572,40009,40449,40891, + 41337,41785,42236,42690,43147,43606,44069,44534, + 45002,45473,45947,46423,46903,47385,47871,48359, + 48850,49344,49841,50341,50844,51349,51858,52369, + 52884,53401,53921,54445,54971,55500,56032,56567, + 57105,57646,58190,58737,59287,59840,60396,60955, + 61517,62082,62650,63221,63795,64372,64952,65535 +}; + +#endif /* simplified read only */ + +/* The base/delta tables are required for both read and write (but currently + * only the simplified versions.) + */ +const png_uint_16 png_sRGB_base[512] = +{ + 128,1782,3383,4644,5675,6564,7357,8074, + 8732,9346,9921,10463,10977,11466,11935,12384, + 12816,13233,13634,14024,14402,14769,15125,15473, + 15812,16142,16466,16781,17090,17393,17690,17981, + 18266,18546,18822,19093,19359,19621,19879,20133, + 20383,20630,20873,21113,21349,21583,21813,22041, + 22265,22487,22707,22923,23138,23350,23559,23767, + 23972,24175,24376,24575,24772,24967,25160,25352, + 25542,25730,25916,26101,26284,26465,26645,26823, + 27000,27176,27350,27523,27695,27865,28034,28201, + 28368,28533,28697,28860,29021,29182,29341,29500, + 29657,29813,29969,30123,30276,30429,30580,30730, + 30880,31028,31176,31323,31469,31614,31758,31902, + 32045,32186,32327,32468,32607,32746,32884,33021, + 33158,33294,33429,33564,33697,33831,33963,34095, + 34226,34357,34486,34616,34744,34873,35000,35127, + 35253,35379,35504,35629,35753,35876,35999,36122, + 36244,36365,36486,36606,36726,36845,36964,37083, + 37201,37318,37435,37551,37668,37783,37898,38013, + 38127,38241,38354,38467,38580,38692,38803,38915, + 39026,39136,39246,39356,39465,39574,39682,39790, + 39898,40005,40112,40219,40325,40431,40537,40642, + 40747,40851,40955,41059,41163,41266,41369,41471, + 41573,41675,41777,41878,41979,42079,42179,42279, + 42379,42478,42577,42676,42775,42873,42971,43068, + 43165,43262,43359,43456,43552,43648,43743,43839, + 43934,44028,44123,44217,44311,44405,44499,44592, + 44685,44778,44870,44962,45054,45146,45238,45329, + 45420,45511,45601,45692,45782,45872,45961,46051, + 46140,46229,46318,46406,46494,46583,46670,46758, + 46846,46933,47020,47107,47193,47280,47366,47452, + 47538,47623,47709,47794,47879,47964,48048,48133, + 48217,48301,48385,48468,48552,48635,48718,48801, + 48884,48966,49048,49131,49213,49294,49376,49458, + 49539,49620,49701,49782,49862,49943,50023,50103, + 50183,50263,50342,50422,50501,50580,50659,50738, + 50816,50895,50973,51051,51129,51207,51285,51362, + 51439,51517,51594,51671,51747,51824,51900,51977, + 52053,52129,52205,52280,52356,52432,52507,52582, + 52657,52732,52807,52881,52956,53030,53104,53178, + 53252,53326,53400,53473,53546,53620,53693,53766, + 53839,53911,53984,54056,54129,54201,54273,54345, + 54417,54489,54560,54632,54703,54774,54845,54916, + 54987,55058,55129,55199,55269,55340,55410,55480, + 55550,55620,55689,55759,55828,55898,55967,56036, + 56105,56174,56243,56311,56380,56448,56517,56585, + 56653,56721,56789,56857,56924,56992,57059,57127, + 57194,57261,57328,57395,57462,57529,57595,57662, + 57728,57795,57861,57927,57993,58059,58125,58191, + 58256,58322,58387,58453,58518,58583,58648,58713, + 58778,58843,58908,58972,59037,59101,59165,59230, + 59294,59358,59422,59486,59549,59613,59677,59740, + 59804,59867,59930,59993,60056,60119,60182,60245, + 60308,60370,60433,60495,60558,60620,60682,60744, + 60806,60868,60930,60992,61054,61115,61177,61238, + 61300,61361,61422,61483,61544,61605,61666,61727, + 61788,61848,61909,61969,62030,62090,62150,62211, + 62271,62331,62391,62450,62510,62570,62630,62689, + 62749,62808,62867,62927,62986,63045,63104,63163, + 63222,63281,63340,63398,63457,63515,63574,63632, + 63691,63749,63807,63865,63923,63981,64039,64097, + 64155,64212,64270,64328,64385,64443,64500,64557, + 64614,64672,64729,64786,64843,64900,64956,65013, + 65070,65126,65183,65239,65296,65352,65409,65465 +}; + +const png_byte png_sRGB_delta[512] = +{ + 207,201,158,129,113,100,90,82,77,72,68,64,61,59,56,54, + 52,50,49,47,46,45,43,42,41,40,39,39,38,37,36,36, + 35,34,34,33,33,32,32,31,31,30,30,30,29,29,28,28, + 28,27,27,27,27,26,26,26,25,25,25,25,24,24,24,24, + 23,23,23,23,23,22,22,22,22,22,22,21,21,21,21,21, + 21,20,20,20,20,20,20,20,20,19,19,19,19,19,19,19, + 19,18,18,18,18,18,18,18,18,18,18,17,17,17,17,17, + 17,17,17,17,17,17,16,16,16,16,16,16,16,16,16,16, + 16,16,16,16,15,15,15,15,15,15,15,15,15,15,15,15, + 15,15,15,15,14,14,14,14,14,14,14,14,14,14,14,14, + 14,14,14,14,14,14,14,13,13,13,13,13,13,13,13,13, + 13,13,13,13,13,13,13,13,13,13,13,13,13,13,12,12, + 12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12, + 12,12,12,12,12,12,12,12,12,12,12,12,11,11,11,11, + 11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11, + 11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11, + 11,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, + 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, + 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, + 10,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, + 9,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, + 8,8,8,8,8,8,8,8,8,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, + 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 +}; +#endif /* SIMPLIFIED READ/WRITE sRGB support */ + +/* SIMPLIFIED READ/WRITE SUPPORT */ +#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\ + defined PNG_SIMPLIFIED_WRITE_SUPPORTED +static int +png_image_free_function(png_voidp argument) +{ + png_imagep image = png_voidcast(png_imagep, argument); + png_controlp cp = image->opaque; + png_control c; + + /* Double check that we have a png_ptr - it should be impossible to get here + * without one. + */ + if (cp->png_ptr == NULL) + return 0; + + /* First free any data held in the control structure. */ +# ifdef PNG_STDIO_SUPPORTED + if (cp->owned_file) + { + FILE *fp = png_voidcast(FILE*, cp->png_ptr->io_ptr); + cp->owned_file = 0; + + /* Ignore errors here. */ + if (fp != NULL) + { + cp->png_ptr->io_ptr = NULL; + (void)fclose(fp); + } + } +# endif + + /* Copy the control structure so that the original, allocated, version can be + * safely freed. Notice that a png_error here stops the remainder of the + * cleanup, but this is probably fine because that would indicate bad memory + * problems anyway. + */ + c = *cp; + image->opaque = &c; + png_free(c.png_ptr, cp); + + /* Then the structures, calling the correct API. */ + if (c.for_write) + { +# ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED + png_destroy_write_struct(&c.png_ptr, &c.info_ptr); +# else + png_error(c.png_ptr, "simplified write not supported"); +# endif + } + else + { +# ifdef PNG_SIMPLIFIED_READ_SUPPORTED + png_destroy_read_struct(&c.png_ptr, &c.info_ptr, NULL); +# else + png_error(c.png_ptr, "simplified read not supported"); +# endif + } + + /* Success. */ + return 1; +} + +void PNGAPI +png_image_free(png_imagep image) +{ + /* Safely call the real function, but only if doing so is safe at this point + * (if not inside an error handling context). Otherwise assume + * png_safe_execute will call this API after the return. + */ + if (image != NULL && image->opaque != NULL && + image->opaque->error_buf == NULL) + { + /* Ignore errors here: */ + (void)png_safe_execute(image, png_image_free_function, image); + image->opaque = NULL; + } +} + +int /* PRIVATE */ +png_image_error(png_imagep image, png_const_charp error_message) +{ + /* Utility to log an error. */ + png_safecat(image->message, (sizeof image->message), 0, error_message); + image->warning_or_error |= PNG_IMAGE_ERROR; + png_image_free(image); + return 0; +} + +#endif /* SIMPLIFIED READ/WRITE */ #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */ diff -ru4NwbB libpng-1.5.13/png.h libpng-1.6.0beta32/png.h --- libpng-1.5.13/png.h 2012-09-27 06:21:19.609548838 -0500 +++ libpng-1.6.0beta32/png.h 2012-11-25 12:40:09.980588611 -0600 @@ -165,23 +165,9 @@ * 1.5.6 15 10506 15.so.15.6[.0] * 1.5.7beta01-05 15 10507 15.so.15.7[.0] * 1.5.7rc01-03 15 10507 15.so.15.7[.0] * 1.5.7 15 10507 15.so.15.7[.0] - * 1.5.8beta01 15 10508 15.so.15.8[.0] - * 1.5.8rc01 15 10508 15.so.15.8[.0] - * 1.5.8 15 10508 15.so.15.8[.0] - * 1.5.9beta01-02 15 10509 15.so.15.9[.0] - * 1.5.9rc01 15 10509 15.so.15.9[.0] - * 1.5.9 15 10509 15.so.15.9[.0] - * 1.5.10beta01-05 15 10510 15.so.15.10[.0] - * 1.5.10 15 10510 15.so.15.10[.0] - * 1.5.11beta01 15 10511 15.so.15.11[.0] - * 1.5.11rc01-05 15 10511 15.so.15.11[.0] - * 1.5.11 15 10511 15.so.15.11[.0] - * 1.5.12 15 10512 15.so.15.12[.0] - * 1.5.13beta01-02 15 10513 15.so.15.13[.0] - * 1.5.13rc01 15 10513 15.so.15.13[.0] - * 1.5.13 15 10513 15.so.15.13[.0] + * 1.6.0beta01-32 16 10600 16.so.16.0[.0] * * Henceforth the source version will match the shared-library major * and minor numbers; the shared-library major version number will be * used for changes in backward compatibility, as it is intended. The @@ -333,21 +319,22 @@ * upward through 1.6.0beta32 are Y2K compliant. It is my belief that * earlier versions were also Y2K compliant. * * Libpng only has two year fields. One is a 2-byte unsigned integer - * that will hold years up to 65535. The other holds the date in text - * format, and will hold years up to 9999. + * that will hold years up to 65535. The other, which is deprecated, + * holds the date in text format, and will hold years up to 9999. * * The integer is * "png_uint_16 year" in png_time_struct. * * The string is - * "char time_buffer[29]" in png_struct. This will be no - * longer used in libpng-1.6.0 and will be removed from libpng-1.7.0. + * "char time_buffer[29]" in png_struct. This is no longer used + * in libpng-1.6.x and will be removed from libpng-1.7.0. * * There are seven time-related functions: - * png.c: png_convert_to_rfc_1123() in png.c - * (formerly png_convert_to_rfc_1152() in error) + * png.c: png_convert_to_rfc_1123_buffer() in png.c + * (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and + * png_convert_to_rfc_1152() in error prior to libpng-0.98) * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c * png_convert_from_time_t() in pngwrite.c * png_get_tIME() in pngget.c * png_handle_tIME() in pngrutil.c, called in pngread.c @@ -356,10 +343,10 @@ * * All handle dates properly in a Y2K environment. The * png_convert_from_time_t() function calls gmtime() to convert from system * clock time, which returns (year - 1900), which we properly convert to - * the full 4-digit year. There is a possibility that applications using - * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() + * the full 4-digit year. There is a possibility that libpng applications + * are not passing 4-digit years into the png_convert_to_rfc_1123_buffer() * function, or that they are incorrectly passing only a 2-digit year * instead of "year - 1900" into the png_convert_from_struct_tm() function, * but this is not under our control. The libpng documentation has always * stated that it works with 4-digit years, and the APIs have been @@ -442,26 +429,8 @@ # include "pnglibconf.h" #endif #ifndef PNG_VERSION_INFO_ONLY -# ifndef PNG_BUILDING_SYMBOL_TABLE - /* - * Standard header files (not needed for the version info or while - * building symbol table -- see scripts/pnglibconf.dfa) - */ -# ifdef PNG_SETJMP_SUPPORTED -# include -# endif - - /* Need the time information for converting tIME chunks, it - * defines struct tm: - */ -# ifdef PNG_CONVERT_tIME_SUPPORTED - /* "time.h" functions are not supported on all operating systems */ -# include -# endif -# endif - /* Machine specific configuration. */ # include "pngconf.h" #endif @@ -509,8 +478,9 @@ * code when it is built. (Build time configuration is in pnglibconf.h) * 2. Type definitions (base types are defined in pngconf.h), structure * definitions. * 3. Exported library functions. + * 4. Simplified API. * * The library source code has additional files (principally pngpriv.h) that * allow configuration of the library. */ @@ -553,8 +523,49 @@ * do not agree upon the version number. */ typedef char* png_libpng_version_%_VER_%; +/* Basic control structions. Read libpng-manual.txt or libpng.3 for more info. + * + * png_struct is the cache of information used while reading or writing a single + * PNG file. One of these is always required, although the simplified API + * (below) hides the creation and destruction of it. + */ +typedef struct png_struct_def png_struct; +typedef const png_struct * png_const_structp; +typedef png_struct * png_structp; +typedef png_struct * * png_structpp; + +/* png_info contains information read from or to be written to a PNG file. One + * or more of these must exist while reading or creating a PNG file. The + * information is not used by libpng during read but is used to control what + * gets written when a PNG file is created. "png_get_" function calls read + * information during read and "png_set_" functions calls write information + * when creating a PNG. + * been moved into a separate header file that is not accessible to + * applications. Read libpng-manual.txt or libpng.3 for more info. + */ +typedef struct png_info_def png_info; +typedef png_info * png_infop; +typedef const png_info * png_const_infop; +typedef png_info * * png_infopp; + +/* Types with names ending 'p' are pointer types. The corresponding types with + * names ending 'rp' are identical pointer types except that the pointer is + * marked 'restrict', which means that it is the only pointer to the object + * passed to the function. Applications should not use the 'restrict' types; + * it is always valid to pass 'p' to a pointer with a function argument of the + * corresponding 'rp' type. Different compilers have different rules with + * regard to type matching in the presence of 'restrict'. For backward + * compatibility libpng callbacks never have 'restrict' in their parameters and, + * consequentially, writing portable application code is extremely difficult if + * an attempt is made to use 'restrict'. + */ +typedef png_struct * PNG_RESTRICT png_structrp; +typedef const png_struct * PNG_RESTRICT png_const_structrp; +typedef png_info * PNG_RESTRICT png_inforp; +typedef const png_info * PNG_RESTRICT png_const_inforp; + /* Three color definitions. The order of the red, green, and blue, (and the * exact size) is not important, although the size of the fields need to * be png_byte or png_uint_16 (as defined below). */ @@ -563,11 +574,11 @@ png_byte red; png_byte green; png_byte blue; } png_color; -typedef png_color FAR * png_colorp; -typedef PNG_CONST png_color FAR * png_const_colorp; -typedef png_color FAR * FAR * png_colorpp; +typedef png_color * png_colorp; +typedef const png_color * png_const_colorp; +typedef png_color * * png_colorpp; typedef struct png_color_16_struct { png_byte index; /* used for palette files */ @@ -575,11 +586,11 @@ png_uint_16 green; png_uint_16 blue; png_uint_16 gray; /* for use in grayscale files */ } png_color_16; -typedef png_color_16 FAR * png_color_16p; -typedef PNG_CONST png_color_16 FAR * png_const_color_16p; -typedef png_color_16 FAR * FAR * png_color_16pp; +typedef png_color_16 * png_color_16p; +typedef const png_color_16 * png_const_color_16p; +typedef png_color_16 * * png_color_16pp; typedef struct png_color_8_struct { png_byte red; /* for use in red green blue files */ @@ -587,11 +598,11 @@ png_byte blue; png_byte gray; /* for use in grayscale files */ png_byte alpha; /* for alpha channel files */ } png_color_8; -typedef png_color_8 FAR * png_color_8p; -typedef PNG_CONST png_color_8 FAR * png_const_color_8p; -typedef png_color_8 FAR * FAR * png_color_8pp; +typedef png_color_8 * png_color_8p; +typedef const png_color_8 * png_const_color_8p; +typedef png_color_8 * * png_color_8pp; /* * The following two structures are used for the in-core representation * of sPLT chunks. @@ -603,11 +614,11 @@ png_uint_16 blue; png_uint_16 alpha; png_uint_16 frequency; } png_sPLT_entry; -typedef png_sPLT_entry FAR * png_sPLT_entryp; -typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp; -typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; +typedef png_sPLT_entry * png_sPLT_entryp; +typedef const png_sPLT_entry * png_const_sPLT_entryp; +typedef png_sPLT_entry * * png_sPLT_entrypp; /* When the depth of the sPLT palette is 8 bits, the color and alpha samples * occupy the LSB of their respective members, and the MSB of each member * is zero-filled. The frequency member always occupies the full 16 bits. @@ -619,11 +630,11 @@ png_byte depth; /* depth of palette samples */ png_sPLT_entryp entries; /* palette entries */ png_int_32 nentries; /* number of palette entries */ } png_sPLT_t; -typedef png_sPLT_t FAR * png_sPLT_tp; -typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp; -typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; +typedef png_sPLT_t * png_sPLT_tp; +typedef const png_sPLT_t * png_const_sPLT_tp; +typedef png_sPLT_t * * png_sPLT_tpp; #ifdef PNG_TEXT_SUPPORTED /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, * and whether that contents is compressed or not. The "key" field @@ -658,11 +669,11 @@ or a NULL pointer */ png_charp lang_key; /* keyword translated UTF-8 string, 0 or more chars or a NULL pointer */ } png_text; -typedef png_text FAR * png_textp; -typedef PNG_CONST png_text FAR * png_const_textp; -typedef png_text FAR * FAR * png_textpp; +typedef png_text * png_textp; +typedef const png_text * png_const_textp; +typedef png_text * * png_textpp; #endif /* Supported compression types for text in PNG files (tEXt, and zTXt). * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ @@ -688,51 +699,46 @@ png_byte hour; /* hour of day, 0 - 23 */ png_byte minute; /* minute of hour, 0 - 59 */ png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ } png_time; -typedef png_time FAR * png_timep; -typedef PNG_CONST png_time FAR * png_const_timep; -typedef png_time FAR * FAR * png_timepp; +typedef png_time * png_timep; +typedef const png_time * png_const_timep; +typedef png_time * * png_timepp; -#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ - defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED /* png_unknown_chunk is a structure to hold queued chunks for which there is * no specific support. The idea is that we can use this to queue * up private chunks for output even though the library doesn't actually * know about their semantics. + * + * The data in the structure is set by libpng on read and used on write. */ typedef struct png_unknown_chunk_t { - png_byte name[5]; - png_byte *data; + png_byte name[5]; /* Textual chunk name with '\0' terminator */ + png_byte *data; /* Data, should not be modified on read! */ png_size_t size; - /* libpng-using applications should NOT directly modify this byte. */ + /* On write 'location' must be set using the flag values listed below. + * Notice that on read it is set by libpng however the values stored have + * more bits set than are listed below. Always treat the value as a + * bitmask. On write set only one bit - setting multiple bits may cause the + * chunk to be written in multiple places. + */ png_byte location; /* mode of operation at read time */ } - - png_unknown_chunk; -typedef png_unknown_chunk FAR * png_unknown_chunkp; -typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp; -typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; -#endif -/* Values for the unknown chunk location byte */ +typedef png_unknown_chunk * png_unknown_chunkp; +typedef const png_unknown_chunk * png_const_unknown_chunkp; +typedef png_unknown_chunk * * png_unknown_chunkpp; +#endif +/* Flag values for the unknown chunk location byte. */ #define PNG_HAVE_IHDR 0x01 #define PNG_HAVE_PLTE 0x02 #define PNG_AFTER_IDAT 0x08 -/* The complete definition of png_info has, as of libpng-1.5.0, - * been moved into a separate header file that is not accessible to - * applications. Read libpng-manual.txt or libpng.3 for more info. - */ -typedef struct png_info_def png_info; -typedef png_info FAR * png_infop; -typedef PNG_CONST png_info FAR * png_const_infop; -typedef png_info FAR * FAR * png_infopp; - /* Maximum positive integer used in PNG is (2^31)-1 */ #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) #define PNG_UINT_32_MAX ((png_uint_32)(-1)) #define PNG_SIZE_MAX ((png_size_t)(-1)) @@ -846,18 +852,10 @@ png_byte channels; /* number of channels (1, 2, 3, or 4) */ png_byte pixel_depth; /* bits per pixel (depth * channels) */ } png_row_info; -typedef png_row_info FAR * png_row_infop; -typedef png_row_info FAR * FAR * png_row_infopp; - -/* The complete definition of png_struct has, as of libpng-1.5.0, - * been moved into a separate header file that is not accessible to - * applications. Read libpng-manual.txt or libpng.3 for more info. - */ -typedef struct png_struct_def png_struct; -typedef PNG_CONST png_struct FAR * png_const_structp; -typedef png_struct FAR * png_structp; +typedef png_row_info * png_row_infop; +typedef png_row_info * * png_row_infopp; /* These are the function types for the I/O functions and for the functions * that allow the user to override the default I/O functions with his or her * own. The png_error_ptr type should match that of user-supplied warning @@ -902,9 +900,10 @@ typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, png_unknown_chunkp)); #endif #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED -typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); +/* not used anywhere */ +/* typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); */ #endif #ifdef PNG_SETJMP_SUPPORTED /* This must match the function definition in , and the application @@ -958,10 +957,8 @@ typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, png_alloc_size_t)); typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); -typedef png_struct FAR * FAR * png_structpp; - /* Section 3: exported functions * Here are the function definitions most commonly used. This is not * the place to find out how to use libpng. See libpng-manual.txt for the * full explanation, see example.c for the summary. This just provides @@ -995,9 +992,9 @@ /* Tell lib we have already handled the first magic bytes. * Handling more than 8 bytes from the beginning of the file is an error. */ -PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes)); +PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes)); /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a * PNG file. Returns zero if the supplied bytes match the 8-byte PNG * signature, and non-zero otherwise. Having num_to_check == 0 or @@ -1023,11 +1020,11 @@ png_error_ptr warn_fn), PNG_ALLOCATED); PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); -PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, +PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr, png_size_t size)); /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp * match up. @@ -1039,12 +1036,12 @@ * acceptable. The size of the jmp_buf is checked against the actual size * allocated by the library - the call will return NULL on a mismatch * indicating an ABI mismatch. */ -PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr, +PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr, png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); # define png_jmpbuf(png_ptr) \ - (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) + (*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf)))) #else # define png_jmpbuf(png_ptr) \ (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) #endif @@ -1052,14 +1049,14 @@ * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it * will use it; otherwise it will call PNG_ABORT(). This function was * added in libpng-1.5.0. */ -PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val), +PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val), PNG_NORETURN); #ifdef PNG_READ_SUPPORTED /* Reset the compression stream */ -PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr)); +PNG_EXPORTA(10, int, png_reset_zstream, (png_structrp png_ptr), PNG_DEPRECATED); #endif /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ #ifdef PNG_USER_MEM_SUPPORTED @@ -1075,83 +1072,94 @@ PNG_ALLOCATED); #endif /* Write the PNG file signature. */ -PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr)); +PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr)); /* Write a PNG chunk - size, type, (optional) data, CRC. */ -PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep +PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep chunk_name, png_const_bytep data, png_size_t length)); /* Write the start of a PNG chunk - length and chunk name. */ -PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr, +PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr, png_const_bytep chunk_name, png_uint_32 length)); /* Write the data of a PNG chunk started with png_write_chunk_start(). */ -PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr, +PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr, png_const_bytep data, png_size_t length)); /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ -PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr)); +PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr)); /* Allocate and initialize the info structure */ -PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr), +PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr), PNG_ALLOCATED); -PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr, - png_size_t png_info_struct_size)); +/* DEPRECATED: this function allowed init structures to be created using the + * default allocation method (typically malloc). Use is deprecated in 1.6.0 and + * the API will be removed in the future. + */ +PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr, + png_size_t png_info_struct_size), PNG_DEPRECATED); /* Writes all the PNG information before the image. */ PNG_EXPORT(20, void, png_write_info_before_PLTE, - (png_structp png_ptr, png_infop info_ptr)); + (png_structrp png_ptr, png_const_inforp info_ptr)); PNG_EXPORT(21, void, png_write_info, - (png_structp png_ptr, png_infop info_ptr)); + (png_structrp png_ptr, png_const_inforp info_ptr)); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the information before the actual image data. */ PNG_EXPORT(22, void, png_read_info, - (png_structp png_ptr, png_infop info_ptr)); + (png_structrp png_ptr, png_inforp info_ptr)); #endif #ifdef PNG_TIME_RFC1123_SUPPORTED -PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123, - (png_structp png_ptr, + /* Convert to a US string format: there is no localization support in this + * routine. The original implementation used a 29 character buffer in + * png_struct, this will be removed in future versions. + */ +#if PNG_LIBPNG_VER < 10700 +/* To do: remove this from libpng17 (and from libpng17/png.c and pngstruct.h) */ +PNG_EXPORTA(23, png_const_charp, png_convert_to_rfc1123, (png_structrp png_ptr, + png_const_timep ptime),PNG_DEPRECATED); +#endif +PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29], png_const_timep ptime)); #endif #ifdef PNG_CONVERT_tIME_SUPPORTED /* Convert from a struct tm to png_time */ PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, - PNG_CONST struct tm FAR * ttime)); + const struct tm * ttime)); /* Convert from time_t to png_time. Uses gmtime() */ -PNG_EXPORT(25, void, png_convert_from_time_t, - (png_timep ptime, time_t ttime)); +PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime)); #endif /* PNG_CONVERT_tIME_SUPPORTED */ #ifdef PNG_READ_EXPAND_SUPPORTED /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ -PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr)); -PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr)); -PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr)); -PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr)); +PNG_EXPORT(26, void, png_set_expand, (png_structrp png_ptr)); +PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structrp png_ptr)); +PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structrp png_ptr)); +PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structrp png_ptr)); #endif #ifdef PNG_READ_EXPAND_16_SUPPORTED /* Expand to 16-bit channels, forces conversion of palette to RGB and expansion * of a tRNS chunk if present. */ -PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr)); +PNG_EXPORT(221, void, png_set_expand_16, (png_structrp png_ptr)); #endif #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) /* Use blue, green, red order for pixels. */ -PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr)); +PNG_EXPORT(30, void, png_set_bgr, (png_structrp png_ptr)); #endif #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED /* Expand the grayscale to 24-bit RGB if necessary. */ -PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr)); +PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structrp png_ptr)); #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED /* Reduce RGB to grayscale. */ @@ -1159,14 +1167,14 @@ #define PNG_ERROR_ACTION_WARN 2 #define PNG_ERROR_ACTION_ERROR 3 #define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ -PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr, +PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structrp png_ptr, int error_action, double red, double green)) -PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr, +PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structrp png_ptr, int error_action, png_fixed_point red, png_fixed_point green)) -PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp +PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structrp png_ptr)); #endif #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED @@ -1229,15 +1237,15 @@ #define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ #define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ #define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ -PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode, +PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structrp png_ptr, int mode, double output_gamma)) -PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr, +PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structrp png_ptr, int mode, png_fixed_point output_gamma)) #endif -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) +#if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) /* The output_gamma value is a screen gamma in libpng terminology: it expresses * how to decode the output values, not how they are encoded. The values used * correspond to the normal numbers used to describe the overall gamma of a * computer display system; for example 2.2 for an sRGB conformant system. The @@ -1383,53 +1391,52 @@ * are ignored. */ #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED -PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr)); +PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr)); #endif #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) -PNG_EXPORT(37, void, png_set_swap_alpha, (png_structp png_ptr)); +PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr)); #endif #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) -PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr)); +PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr)); #endif #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ -PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler, +PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler, int flags)); /* The values of the PNG_FILLER_ defines should NOT be changed */ # define PNG_FILLER_BEFORE 0 # define PNG_FILLER_AFTER 1 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ -PNG_EXPORT(40, void, png_set_add_alpha, - (png_structp png_ptr, png_uint_32 filler, - int flags)); +PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr, + png_uint_32 filler, int flags)); #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) /* Swap bytes in 16-bit depth files. */ -PNG_EXPORT(41, void, png_set_swap, (png_structp png_ptr)); +PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr)); #endif #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ -PNG_EXPORT(42, void, png_set_packing, (png_structp png_ptr)); +PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr)); #endif #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ defined(PNG_WRITE_PACKSWAP_SUPPORTED) /* Swap packing order of pixels in bytes. */ -PNG_EXPORT(43, void, png_set_packswap, (png_structp png_ptr)); +PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr)); #endif #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) /* Converts files to legal bit depths. */ -PNG_EXPORT(44, void, png_set_shift, (png_structp png_ptr, png_const_color_8p +PNG_EXPORT(44, void, png_set_shift, (png_structrp png_ptr, png_const_color_8p true_bits)); #endif #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ @@ -1439,26 +1446,26 @@ * otherwise it will not have the desired effect. Note that it is still * necessary to call png_read_row or png_read_rows png_get_image_height * times for each pass. */ -PNG_EXPORT(45, int, png_set_interlace_handling, (png_structp png_ptr)); +PNG_EXPORT(45, int, png_set_interlace_handling, (png_structrp png_ptr)); #endif #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) /* Invert monochrome files */ -PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr)); +PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr)); #endif #ifdef PNG_READ_BACKGROUND_SUPPORTED /* Handle alpha and tRNS by replacing with a background color. Prior to * libpng-1.5.4 this API must not be called before the PNG file header has been * read. Doing so will result in unexpected behavior and possible warnings or * errors if the PNG file contains a bKGD chunk. */ -PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr, +PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma)) -PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr, +PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structrp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, png_fixed_point background_gamma)) #endif #ifdef PNG_READ_BACKGROUND_SUPPORTED @@ -1469,25 +1476,24 @@ #endif #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED /* Scale a 16-bit depth file down to 8-bit, accurately. */ -PNG_EXPORT(229, void, png_set_scale_16, (png_structp png_ptr)); +PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr)); #endif #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED #define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */ /* Strip the second byte of information from a 16-bit depth file. */ -PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr)); +PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr)); #endif #ifdef PNG_READ_QUANTIZE_SUPPORTED /* Turn on quantizing, and reduce the palette to the number of colors * available. */ -PNG_EXPORT(49, void, png_set_quantize, - (png_structp png_ptr, png_colorp palette, - int num_palette, int maximum_colors, png_const_uint_16p histogram, - int full_quantize)); +PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr, + png_colorp palette, int num_palette, int maximum_colors, + png_const_uint_16p histogram, int full_quantize)); #endif #ifdef PNG_READ_GAMMA_SUPPORTED /* The threshold on gamma processing is configurable but hard-wired into the @@ -1505,73 +1511,71 @@ * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either * API (floating point or fixed.) Notice, however, that the 'file_gamma' value * is the inverse of a 'screen gamma' value. */ -PNG_FP_EXPORT(50, void, png_set_gamma, - (png_structp png_ptr, double screen_gamma, - double override_file_gamma)) -PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr, +PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr, + double screen_gamma, double override_file_gamma)) +PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structrp png_ptr, png_fixed_point screen_gamma, png_fixed_point override_file_gamma)) #endif #ifdef PNG_WRITE_FLUSH_SUPPORTED /* Set how many lines between output flushes - 0 for no flushing */ -PNG_EXPORT(51, void, png_set_flush, (png_structp png_ptr, int nrows)); +PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows)); /* Flush the current PNG output buffer */ -PNG_EXPORT(52, void, png_write_flush, (png_structp png_ptr)); +PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr)); #endif /* Optional update palette with requested transformations */ -PNG_EXPORT(53, void, png_start_read_image, (png_structp png_ptr)); +PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr)); /* Optional call to update the users info structure */ -PNG_EXPORT(54, void, png_read_update_info, - (png_structp png_ptr, png_infop info_ptr)); +PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr, + png_inforp info_ptr)); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read one or more rows of image data. */ -PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row, +PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); #endif #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read a row of data. */ -PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row, +PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row, png_bytep display_row)); #endif #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the whole image into memory at once. */ -PNG_EXPORT(57, void, png_read_image, (png_structp png_ptr, png_bytepp image)); +PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image)); #endif /* Write a row of image data */ -PNG_EXPORT(58, void, png_write_row, - (png_structp png_ptr, png_const_bytep row)); +PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr, + png_const_bytep row)); /* Write a few rows of image data: (*row) is not written; however, the type * is declared as writeable to maintain compatibility with previous versions * of libpng and to allow the 'display_row' array from read_rows to be passed * unchanged to write_rows. */ -PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row, +PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row, png_uint_32 num_rows)); /* Write the image data */ -PNG_EXPORT(60, void, png_write_image, - (png_structp png_ptr, png_bytepp image)); +PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image)); /* Write the end of the PNG file. */ -PNG_EXPORT(61, void, png_write_end, - (png_structp png_ptr, png_infop info_ptr)); +PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr, + png_inforp info_ptr)); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the end of the PNG file. */ -PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr)); +PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr)); #endif /* Free any memory associated with the png_info_struct */ -PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr, +PNG_EXPORT(63, void, png_destroy_info_struct, (png_const_structrp png_ptr, png_infopp info_ptr_ptr)); /* Free any memory associated with the png_struct and the png_info_structs */ PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, @@ -1581,10 +1585,10 @@ PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); /* Set the libpng method of handling chunk CRC errors */ -PNG_EXPORT(66, void, png_set_crc_action, - (png_structp png_ptr, int crit_action, int ancil_action)); +PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action, + int ancil_action)); /* Values for png_set_crc_action() say how to handle CRC errors in * ancillary and critical chunks, and whether to use the data contained * therein. Note that it is impossible to "discard" data in a critical @@ -1611,10 +1615,10 @@ /* Set the filtering method(s) used by libpng. Currently, the only valid * value for "method" is 0. */ -PNG_EXPORT(67, void, png_set_filter, - (png_structp png_ptr, int method, int filters)); +PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method, + int filters)); /* Flags for png_set_filter() to say which filters to use. The flags * are chosen so that they don't conflict with real filter types * below, in case they are supplied instead of the #defined constants. @@ -1667,15 +1671,15 @@ * change if good general weighting/cost heuristics can be found. If both * the weights and costs are set to 1.0, this degenerates the WEIGHTED method * to the UNWEIGHTED method, but with added encoding time/computation. */ -PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr, +PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr, int heuristic_method, int num_weights, png_const_doublep filter_weights, png_const_doublep filter_costs)) PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, - (png_structp png_ptr, - int heuristic_method, int num_weights, png_const_fixed_point_p - filter_weights, png_const_fixed_point_p filter_costs)) + (png_structrp png_ptr, int heuristic_method, int num_weights, + png_const_fixed_point_p filter_weights, + png_const_fixed_point_p filter_costs)) #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ /* Heuristic used for row filter selection. These defines should NOT be * changed. @@ -1692,45 +1696,45 @@ * shown that zlib compression levels 3-6 usually perform as well as level 9 * for PNG images, and do considerably fewer caclulations. In the future, * these values may not correspond directly to the zlib compression levels. */ -PNG_EXPORT(69, void, png_set_compression_level, - (png_structp png_ptr, int level)); +PNG_EXPORT(69, void, png_set_compression_level, (png_structrp png_ptr, + int level)); -PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr, +PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structrp png_ptr, int mem_level)); -PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr, +PNG_EXPORT(71, void, png_set_compression_strategy, (png_structrp png_ptr, int strategy)); /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a * smaller value of window_bits if it can do so safely. */ -PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr, +PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structrp png_ptr, int window_bits)); -PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr, +PNG_EXPORT(73, void, png_set_compression_method, (png_structrp png_ptr, int method)); #endif #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED /* Also set zlib parameters for compressing non-IDAT chunks */ -PNG_EXPORT(222, void, png_set_text_compression_level, - (png_structp png_ptr, int level)); +PNG_EXPORT(222, void, png_set_text_compression_level, (png_structrp png_ptr, + int level)); -PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr, +PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structrp png_ptr, int mem_level)); -PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr, +PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structrp png_ptr, int strategy)); /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a * smaller value of window_bits if it can do so safely. */ -PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp - png_ptr, int window_bits)); +PNG_EXPORT(225, void, png_set_text_compression_window_bits, + (png_structrp png_ptr, int window_bits)); -PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr, +PNG_EXPORT(226, void, png_set_text_compression_method, (png_structrp png_ptr, int method)); #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ /* These next functions are called for input/output, memory, and error @@ -1743,9 +1747,9 @@ */ #ifdef PNG_STDIO_SUPPORTED /* Initialize the input/output for the PNG file to the default functions. */ -PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp)); +PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp)); #endif /* Replace the (error and abort), and warning functions with user * supplied functions. If no messages are to be printed you must still @@ -1754,14 +1758,13 @@ * method of error handling. If error_fn or warning_fn is NULL, the * default function will be used. */ -PNG_EXPORT(75, void, png_set_error_fn, - (png_structp png_ptr, png_voidp error_ptr, - png_error_ptr error_fn, png_error_ptr warning_fn)); +PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr, + png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); /* Return the user pointer associated with the error functions */ -PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr)); +PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structrp png_ptr)); /* Replace the default data output functions with a user supplied one(s). * If buffered output is not used, then output_flush_fn can be set to NULL. * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time @@ -1771,49 +1774,49 @@ * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's * default flush function, which uses the standard *FILE structure, will * be used. */ -PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr, +PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); /* Replace the default data input function with a user supplied one. */ -PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr, +PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn)); /* Return the user pointer associated with the I/O functions */ -PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr)); +PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_const_structrp png_ptr)); -PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr, +PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr, png_read_status_ptr read_row_fn)); -PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr, +PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr, png_write_status_ptr write_row_fn)); #ifdef PNG_USER_MEM_SUPPORTED /* Replace the default memory allocation functions with user supplied one(s). */ -PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr, +PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); /* Return the user pointer associated with the memory functions */ -PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr)); +PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr)); #endif #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED -PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr, +PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structrp png_ptr, png_user_transform_ptr read_user_transform_fn)); #endif #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED -PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr, +PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structrp png_ptr, png_user_transform_ptr write_user_transform_fn)); #endif #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED -PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr, +PNG_EXPORT(86, void, png_set_user_transform_info, (png_structrp png_ptr, png_voidp user_transform_ptr, int user_transform_depth, int user_transform_channels)); /* Return the user pointer associated with the user transform functions */ PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); #endif #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED /* Return information about the row currently being processed. Note that these @@ -1826,85 +1829,110 @@ * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to * find the output pixel (x,y) given an interlaced sub-image pixel * (row,col,pass). (See below for these macros.) */ -PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp)); -PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp)); +PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structrp)); +PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp)); #endif -#ifdef PNG_USER_CHUNKS_SUPPORTED -PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr, +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED +/* This callback is called only for *unknown* chunks, if + * PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known + * chunks to be treated as unknown, however in this case the callback must do + * any processing required by the chunk (e.g. by calling the appropriate + * png_set_ APIs.) + * + * There is no write support - on write, by default, all the chunks in the + * 'unknown' list are written in the specified position. + * + * The integer return from the callback function is interpreted thus: + * + * negative: An error occured, png_chunk_error will be called. + * zero: The chunk was not handled, the chunk will be discarded unless + * png_set_keep_unknown_chunks has been used to set a 'keep' behavior + * for this particular chunk, in which case that will be used. A + * critical chunk will cause an error at this point unless it is to be + * saved. + * positive: The chunk was handled, libpng will ignore/discard it. + */ +PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr, png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); -PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr)); +#endif + +#ifdef PNG_USER_CHUNKS_SUPPORTED +PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structrp png_ptr)); #endif #ifdef PNG_PROGRESSIVE_READ_SUPPORTED /* Sets the function callbacks for the push reader, and a pointer to a * user-defined structure available to the callback functions. */ -PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr, +PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structrp png_ptr, png_voidp progressive_ptr, png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); /* Returns the user pointer associated with the push read functions */ -PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr)); +PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, + (png_const_structrp png_ptr)); /* Function to be called when data becomes available */ -PNG_EXPORT(92, void, png_process_data, - (png_structp png_ptr, png_infop info_ptr, - png_bytep buffer, png_size_t buffer_size)); +PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr, + png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size)); /* A function which may be called *only* within png_process_data to stop the * processing of any more data. The function returns the number of bytes * remaining, excluding any that libpng has cached internally. A subsequent * call to png_process_data must supply these bytes again. If the argument * 'save' is set to true the routine will first save all the pending data and * will always return 0. */ -PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save)); +PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structrp, int save)); /* A function which may be called *only* outside (after) a call to * png_process_data. It returns the number of bytes of data to skip in the * input. Normally it will return 0, but if it returns a non-zero value the * application must skip than number of bytes of input data and pass the * following data to the next call to png_process_data. */ -PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp)); +PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structrp)); #ifdef PNG_READ_INTERLACING_SUPPORTED /* Function that combines rows. 'new_row' is a flag that should come from * the callback and be non-NULL if anything needs to be done; the library * stores its own version of the new data internally and ignores the passed * in value. */ -PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr, +PNG_EXPORT(93, void, png_progressive_combine_row, (png_const_structrp png_ptr, png_bytep old_row, png_const_bytep new_row)); #endif /* PNG_READ_INTERLACING_SUPPORTED */ #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ -PNG_EXPORTA(94, png_voidp, png_malloc, - (png_structp png_ptr, png_alloc_size_t size), - PNG_ALLOCATED); +PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED); /* Added at libpng version 1.4.0 */ -PNG_EXPORTA(95, png_voidp, png_calloc, - (png_structp png_ptr, png_alloc_size_t size), - PNG_ALLOCATED); +PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED); /* Added at libpng version 1.2.4 */ -PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr, +PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr, png_alloc_size_t size), PNG_ALLOCATED); /* Frees a pointer allocated by png_malloc() */ -PNG_EXPORT(97, void, png_free, (png_structp png_ptr, png_voidp ptr)); +PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr)); /* Free data that was allocated internally */ -PNG_EXPORT(98, void, png_free_data, - (png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num)); +PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr, + png_inforp info_ptr, png_uint_32 free_me, int num)); /* Reassign responsibility for freeing existing data, whether allocated - * by libpng or by the application */ -PNG_EXPORT(99, void, png_data_freer, - (png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask)); + * by libpng or by the application; this works on the png_info structure passed + * in, it does not change the state for other png_info structures. + * + * It is unlikely that this function works correctly as of 1.6.0 and using it + * may result either in memory leaks or double free of allocated data. + */ +PNG_EXPORTA(99, void, png_data_freer, (png_const_structrp png_ptr, + png_inforp info_ptr, int freer, png_uint_32 mask), PNG_DEPRECATED); /* Assignments for png_data_freer */ #define PNG_DESTROY_WILL_FREE_DATA 1 #define PNG_SET_WILL_FREE_DATA 1 @@ -1915,61 +1943,63 @@ #define PNG_FREE_SPLT 0x0020 #define PNG_FREE_ROWS 0x0040 #define PNG_FREE_PCAL 0x0080 #define PNG_FREE_SCAL 0x0100 +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED #define PNG_FREE_UNKN 0x0200 -#define PNG_FREE_LIST 0x0400 +#endif +/* PNG_FREE_LIST 0x0400 removed in 1.6.0 because it is ignored */ #define PNG_FREE_PLTE 0x1000 #define PNG_FREE_TRNS 0x2000 #define PNG_FREE_TEXT 0x4000 #define PNG_FREE_ALL 0x7fff #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ #ifdef PNG_USER_MEM_SUPPORTED -PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr, - png_alloc_size_t size), PNG_ALLOCATED); -PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr)); +PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr, + png_alloc_size_t size), PNG_ALLOCATED PNG_DEPRECATED); +PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr, + png_voidp ptr), PNG_DEPRECATED); #endif #ifdef PNG_ERROR_TEXT_SUPPORTED /* Fatal error in PNG image of libpng - can't continue */ -PNG_EXPORTA(102, void, png_error, - (png_structp png_ptr, png_const_charp error_message), - PNG_NORETURN); +PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr, + png_const_charp error_message), PNG_NORETURN); /* The same, but the chunk name is prepended to the error string. */ -PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr, +PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr, png_const_charp error_message), PNG_NORETURN); #else /* Fatal error in PNG image of libpng - can't continue */ -PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN); +PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN); #endif #ifdef PNG_WARNINGS_SUPPORTED /* Non-fatal error in libpng. Can continue, but may have a problem. */ -PNG_EXPORT(105, void, png_warning, (png_structp png_ptr, +PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr, png_const_charp warning_message)); /* Non-fatal error in libpng, chunk name is prepended to message. */ -PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr, +PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr, png_const_charp warning_message)); #endif #ifdef PNG_BENIGN_ERRORS_SUPPORTED /* Benign error in libpng. Can continue, but may have a problem. * User can choose whether to handle as a fatal error or as a warning. */ -# undef png_benign_error -PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr, +PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr, png_const_charp warning_message)); -/* Same, chunk name is prepended to message. */ -# undef png_chunk_benign_error -PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr, +#ifdef PNG_READ_SUPPORTED +/* Same, chunk name is prepended to message (only during read) */ +PNG_EXPORT(108, void, png_chunk_benign_error, (png_const_structrp png_ptr, png_const_charp warning_message)); +#endif PNG_EXPORT(109, void, png_set_benign_errors, - (png_structp png_ptr, int allowed)); + (png_structrp png_ptr, int allowed)); #else # ifdef PNG_ALLOW_BENIGN_ERRORS # define png_benign_error png_warning # define png_chunk_benign_error png_chunk_warning @@ -1991,291 +2021,276 @@ * to avoid problems with future changes in the size and internal layout of * png_info_struct. */ /* Returns "flag" if chunk data is valid in info_ptr. */ -PNG_EXPORT(110, png_uint_32, png_get_valid, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_uint_32 flag)); +PNG_EXPORT(110, png_uint_32, png_get_valid, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_32 flag)); /* Returns number of bytes needed to hold a transformed row. */ -PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); #ifdef PNG_INFO_IMAGE_SUPPORTED /* Returns row_pointers, which is an array of pointers to scanlines that was * returned from png_read_png(). */ -PNG_EXPORT(112, png_bytepp, png_get_rows, - (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(112, png_bytepp, png_get_rows, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); + /* Set row_pointers, which is an array of pointers to scanlines for use * by png_write_png(). */ -PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr, - png_infop info_ptr, png_bytepp row_pointers)); +PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr, + png_inforp info_ptr, png_bytepp row_pointers)); #endif /* Returns number of color channels in image. */ -PNG_EXPORT(114, png_byte, png_get_channels, - (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); #ifdef PNG_EASY_ACCESS_SUPPORTED /* Returns image width in pixels. */ -PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image height in pixels. */ -PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image bit_depth. */ -PNG_EXPORT(117, png_byte, png_get_bit_depth, - (png_const_structp png_ptr, png_const_infop info_ptr)); +PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image color_type. */ -PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image filter_type. */ -PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image interlace_type. */ -PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image compression_type. */ -PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr, - png_const_infop info_ptr)); +PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); /* Returns image resolution in pixels per meter, from pHYs chunk data. */ PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); /* Returns pixel aspect ratio, computed from pHYs chunk data. */ PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, - (png_const_structp png_ptr, png_const_infop info_ptr)) + (png_const_structrp png_ptr, png_const_inforp info_ptr)) PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, - (png_const_structp png_ptr, png_const_infop info_ptr)) + (png_const_structrp png_ptr, png_const_inforp info_ptr)) /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); #endif /* PNG_EASY_ACCESS_SUPPORTED */ +#ifdef PNG_READ_SUPPORTED /* Returns pointer to signature string read from PNG header */ -PNG_EXPORT(130, png_const_bytep, png_get_signature, - (png_const_structp png_ptr, png_infop info_ptr)); +PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_const_structrp png_ptr, + png_const_inforp info_ptr)); +#endif #ifdef PNG_bKGD_SUPPORTED -PNG_EXPORT(131, png_uint_32, png_get_bKGD, - (png_const_structp png_ptr, png_infop info_ptr, - png_color_16p *background)); +PNG_EXPORT(131, png_uint_32, png_get_bKGD, (png_const_structrp png_ptr, + png_inforp info_ptr, png_color_16p *background)); #endif #ifdef PNG_bKGD_SUPPORTED -PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr, - png_const_color_16p background)); +PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_color_16p background)); #endif #ifdef PNG_cHRM_SUPPORTED -PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr, - png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, +PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structrp png_ptr, + png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x, double *red_y, double *green_x, double *green_y, double *blue_x, double *blue_y)) -PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_structp png_ptr, - png_const_infop info_ptr, double *red_X, double *red_Y, double *red_Z, +PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_const_structrp png_ptr, + png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z, double *green_X, double *green_Y, double *green_Z, double *blue_X, double *blue_Y, double *blue_Z)) -#ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */ PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, - (png_const_structp png_ptr, - png_const_infop info_ptr, png_fixed_point *int_white_x, - png_fixed_point *int_white_y, png_fixed_point *int_red_x, - png_fixed_point *int_red_y, png_fixed_point *int_green_x, - png_fixed_point *int_green_y, png_fixed_point *int_blue_x, - png_fixed_point *int_blue_y)) -#endif + (png_const_structrp png_ptr, png_const_inforp info_ptr, + png_fixed_point *int_white_x, png_fixed_point *int_white_y, + png_fixed_point *int_red_x, png_fixed_point *int_red_y, + png_fixed_point *int_green_x, png_fixed_point *int_green_y, + png_fixed_point *int_blue_x, png_fixed_point *int_blue_y)) PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed, - (png_structp png_ptr, png_const_infop info_ptr, + (png_const_structrp png_ptr, png_const_inforp info_ptr, png_fixed_point *int_red_X, png_fixed_point *int_red_Y, png_fixed_point *int_red_Z, png_fixed_point *int_green_X, png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, png_fixed_point *int_blue_Z)) #endif #ifdef PNG_cHRM_SUPPORTED -PNG_FP_EXPORT(135, void, png_set_cHRM, - (png_structp png_ptr, png_infop info_ptr, +PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr, + png_inforp info_ptr, double white_x, double white_y, double red_x, double red_y, double green_x, double green_y, double blue_x, double blue_y)) -PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_structp png_ptr, - png_infop info_ptr, double red_X, double red_Y, double red_Z, +PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_const_structrp png_ptr, + png_inforp info_ptr, double red_X, double red_Y, double red_Z, double green_X, double green_Y, double green_Z, double blue_X, double blue_Y, double blue_Z)) -PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr, - png_infop info_ptr, png_fixed_point int_white_x, +PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_const_structrp png_ptr, + png_inforp info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, png_fixed_point int_blue_y)) -PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_structp png_ptr, - png_infop info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, +PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_const_structrp png_ptr, + png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, png_fixed_point int_red_Z, png_fixed_point int_green_X, png_fixed_point int_green_Y, png_fixed_point int_green_Z, png_fixed_point int_blue_X, png_fixed_point int_blue_Y, png_fixed_point int_blue_Z)) #endif #ifdef PNG_gAMA_SUPPORTED -PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, - (png_const_structp png_ptr, png_const_infop info_ptr, - double *file_gamma)) +PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr, + png_const_inforp info_ptr, double *file_gamma)) PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, - (png_const_structp png_ptr, png_const_infop info_ptr, + (png_const_structrp png_ptr, png_const_inforp info_ptr, png_fixed_point *int_file_gamma)) #endif #ifdef PNG_gAMA_SUPPORTED -PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr, - png_infop info_ptr, double file_gamma)) -PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr, - png_infop info_ptr, png_fixed_point int_file_gamma)) +PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr, + png_inforp info_ptr, double file_gamma)) +PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_const_structrp png_ptr, + png_inforp info_ptr, png_fixed_point int_file_gamma)) #endif #ifdef PNG_hIST_SUPPORTED -PNG_EXPORT(141, png_uint_32, png_get_hIST, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_uint_16p *hist)); +PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_16p *hist)); #endif #ifdef PNG_hIST_SUPPORTED -PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr, - png_infop info_ptr, png_const_uint_16p hist)); +PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_uint_16p hist)); #endif -PNG_EXPORT(143, png_uint_32, png_get_IHDR, - (png_structp png_ptr, png_infop info_ptr, - png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, - int *interlace_method, int *compression_method, int *filter_method)); - -PNG_EXPORT(144, void, png_set_IHDR, - (png_structp png_ptr, png_infop info_ptr, - png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, - int interlace_method, int compression_method, int filter_method)); +PNG_EXPORT(143, png_uint_32, png_get_IHDR, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, + int *bit_depth, int *color_type, int *interlace_method, + int *compression_method, int *filter_method)); + +PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr, + png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, + int color_type, int interlace_method, int compression_method, + int filter_method)); #ifdef PNG_oFFs_SUPPORTED -PNG_EXPORT(145, png_uint_32, png_get_oFFs, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)); +PNG_EXPORT(145, png_uint_32, png_get_oFFs, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, + int *unit_type)); #endif #ifdef PNG_oFFs_SUPPORTED -PNG_EXPORT(146, void, png_set_oFFs, - (png_structp png_ptr, png_infop info_ptr, - png_int_32 offset_x, png_int_32 offset_y, int unit_type)); +PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr, + png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y, + int unit_type)); #endif #ifdef PNG_pCAL_SUPPORTED -PNG_EXPORT(147, png_uint_32, png_get_pCAL, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, - int *nparams, - png_charp *units, png_charpp *params)); +PNG_EXPORT(147, png_uint_32, png_get_pCAL, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_charp *purpose, png_int_32 *X0, + png_int_32 *X1, int *type, int *nparams, png_charp *units, + png_charpp *params)); #endif #ifdef PNG_pCAL_SUPPORTED -PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr, - png_infop info_ptr, - png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, - int nparams, png_const_charp units, png_charpp params)); +PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, + int type, int nparams, png_const_charp units, png_charpp params)); #endif #ifdef PNG_pHYs_SUPPORTED -PNG_EXPORT(149, png_uint_32, png_get_pHYs, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); +PNG_EXPORT(149, png_uint_32, png_get_pHYs, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, + int *unit_type)); #endif #ifdef PNG_pHYs_SUPPORTED -PNG_EXPORT(150, void, png_set_pHYs, - (png_structp png_ptr, png_infop info_ptr, - png_uint_32 res_x, png_uint_32 res_y, int unit_type)); +PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr, + png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); #endif -PNG_EXPORT(151, png_uint_32, png_get_PLTE, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_colorp *palette, int *num_palette)); - -PNG_EXPORT(152, void, png_set_PLTE, - (png_structp png_ptr, png_infop info_ptr, - png_const_colorp palette, int num_palette)); +PNG_EXPORT(151, png_uint_32, png_get_PLTE, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_colorp *palette, int *num_palette)); + +PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr, + png_inforp info_ptr, png_const_colorp palette, int num_palette)); #ifdef PNG_sBIT_SUPPORTED -PNG_EXPORT(153, png_uint_32, png_get_sBIT, - (png_const_structp png_ptr, png_infop info_ptr, - png_color_8p *sig_bit)); +PNG_EXPORT(153, png_uint_32, png_get_sBIT, (png_const_structrp png_ptr, + png_inforp info_ptr, png_color_8p *sig_bit)); #endif #ifdef PNG_sBIT_SUPPORTED -PNG_EXPORT(154, void, png_set_sBIT, - (png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit)); +PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_color_8p sig_bit)); #endif #ifdef PNG_sRGB_SUPPORTED -PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr, - png_const_infop info_ptr, int *file_srgb_intent)); +PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structrp png_ptr, + png_const_inforp info_ptr, int *file_srgb_intent)); #endif #ifdef PNG_sRGB_SUPPORTED -PNG_EXPORT(156, void, png_set_sRGB, - (png_structp png_ptr, png_infop info_ptr, int srgb_intent)); -PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr, - png_infop info_ptr, int srgb_intent)); +PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr, + png_inforp info_ptr, int srgb_intent)); +PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_const_structrp png_ptr, + png_inforp info_ptr, int srgb_intent)); #endif #ifdef PNG_iCCP_SUPPORTED -PNG_EXPORT(158, png_uint_32, png_get_iCCP, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_charpp name, int *compression_type, png_bytepp profile, - png_uint_32 *proflen)); +PNG_EXPORT(158, png_uint_32, png_get_iCCP, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_charpp name, int *compression_type, + png_bytepp profile, png_uint_32 *proflen)); #endif #ifdef PNG_iCCP_SUPPORTED -PNG_EXPORT(159, void, png_set_iCCP, - (png_structp png_ptr, png_infop info_ptr, - png_const_charp name, int compression_type, png_const_bytep profile, - png_uint_32 proflen)); +PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_charp name, int compression_type, + png_const_bytep profile, png_uint_32 proflen)); #endif #ifdef PNG_sPLT_SUPPORTED -PNG_EXPORT(160, png_uint_32, png_get_sPLT, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_sPLT_tpp entries)); +PNG_EXPORT(160, png_uint_32, png_get_sPLT, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_sPLT_tpp entries)); #endif #ifdef PNG_sPLT_SUPPORTED -PNG_EXPORT(161, void, png_set_sPLT, - (png_structp png_ptr, png_infop info_ptr, - png_const_sPLT_tp entries, int nentries)); +PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)); #endif #ifdef PNG_TEXT_SUPPORTED /* png_get_text also returns the number of text chunks in *num_text */ -PNG_EXPORT(162, png_uint_32, png_get_text, - (png_const_structp png_ptr, png_const_infop info_ptr, - png_textp *text_ptr, int *num_text)); +PNG_EXPORT(162, png_uint_32, png_get_text, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_textp *text_ptr, int *num_text)); #endif /* Note while png_set_text() will accept a structure whose text, * language, and translated keywords are NULL pointers, the structure @@ -2284,201 +2299,288 @@ * they will never be NULL pointers. */ #ifdef PNG_TEXT_SUPPORTED -PNG_EXPORT(163, void, png_set_text, - (png_structp png_ptr, png_infop info_ptr, - png_const_textp text_ptr, int num_text)); +PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_textp text_ptr, int num_text)); #endif #ifdef PNG_tIME_SUPPORTED -PNG_EXPORT(164, png_uint_32, png_get_tIME, - (png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)); +PNG_EXPORT(164, png_uint_32, png_get_tIME, (png_const_structrp png_ptr, + png_inforp info_ptr, png_timep *mod_time)); #endif #ifdef PNG_tIME_SUPPORTED -PNG_EXPORT(165, void, png_set_tIME, - (png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time)); +PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_timep mod_time)); #endif #ifdef PNG_tRNS_SUPPORTED -PNG_EXPORT(166, png_uint_32, png_get_tRNS, - (png_const_structp png_ptr, png_infop info_ptr, - png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)); +PNG_EXPORT(166, png_uint_32, png_get_tRNS, (png_const_structrp png_ptr, + png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans, + png_color_16p *trans_color)); #endif #ifdef PNG_tRNS_SUPPORTED -PNG_EXPORT(167, void, png_set_tRNS, - (png_structp png_ptr, png_infop info_ptr, - png_const_bytep trans_alpha, int num_trans, +PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr, + png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color)); #endif #ifdef PNG_sCAL_SUPPORTED -PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, - (png_const_structp png_ptr, png_const_infop info_ptr, - int *unit, double *width, double *height)) -#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED +PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, (png_const_structrp png_ptr, + png_const_inforp info_ptr, int *unit, double *width, double *height)) +#if (defined PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ + (defined PNG_FLOATING_POINT_SUPPORTED) /* NOTE: this API is currently implemented using floating point arithmetic, * consequently it can only be used on systems with floating point support. * In any case the range of values supported by png_fixed_point is small and it * is highly recommended that png_get_sCAL_s be used instead. */ PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, - (png_structp png_ptr, png_const_infop info_ptr, int *unit, - png_fixed_point *width, - png_fixed_point *height)) + (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, + png_fixed_point *width, png_fixed_point *height)) #endif PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, - (png_const_structp png_ptr, png_const_infop info_ptr, - int *unit, png_charpp swidth, png_charpp sheight)); + (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, + png_charpp swidth, png_charpp sheight)); -PNG_FP_EXPORT(170, void, png_set_sCAL, - (png_structp png_ptr, png_infop info_ptr, - int unit, double width, double height)) -PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr, - png_infop info_ptr, int unit, png_fixed_point width, +PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr, + png_inforp info_ptr, int unit, double width, double height)) +PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_const_structrp png_ptr, + png_inforp info_ptr, int unit, png_fixed_point width, png_fixed_point height)) -PNG_EXPORT(171, void, png_set_sCAL_s, - (png_structp png_ptr, png_infop info_ptr, - int unit, png_const_charp swidth, png_const_charp sheight)); +PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr, + png_inforp info_ptr, int unit, + png_const_charp swidth, png_const_charp sheight)); #endif /* PNG_sCAL_SUPPORTED */ -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED -/* Provide a list of chunks and how they are to be handled, if the built-in - handling or default unknown chunk handling is not desired. Any chunks not - listed will be handled in the default manner. The IHDR and IEND chunks - must not be listed. Because this turns off the default handling for chunks - that would otherwise be recognized the behavior of libpng transformations may - well become incorrect! - keep = 0: PNG_HANDLE_CHUNK_AS_DEFAULT: follow default behavior - = 1: PNG_HANDLE_CHUNK_NEVER: do not keep - = 2: PNG_HANDLE_CHUNK_IF_SAFE: keep only if safe-to-copy - = 3: PNG_HANDLE_CHUNK_ALWAYS: keep even if unsafe-to-copy -*/ -PNG_EXPORT(172, void, png_set_keep_unknown_chunks, - (png_structp png_ptr, int keep, - png_const_bytep chunk_list, int num_chunks)); - -/* The handling code is returned; the result is therefore true (non-zero) if - * special handling is required, false for the default handling. +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED +/* Provide the default handling for all unknown chunks or, optionally, for + * specific unknown chunks. + * + * NOTE: prior to 1.6.0 the handling specified for particular chunks on read was + * ignored and the default was used, the per-chunk setting only had an effect on + * write. If you wish to have chunk-specific handling on read in code that must + * work on earlier versions you must use a user chunk callback to specify the + * desired handling (keep or discard.) + * + * The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below. The + * parameter is interpreted as follows: + * + * READ: + * PNG_HANDLE_CHUNK_AS_DEFAULT: + * Known chunks: do normal libpng processing, do not keep the chunk (but + * set the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED) + * Unknown chunks: for a specific chunk use the global default, when used + * as the default discard the chunk data. + * PNG_HANDLE_CHUNK_NEVER: + * Discard the chunk data. + * PNG_HANDLE_CHUNK_IF_SAFE: + * Keep the chunk data if the chunk is not critical else raise a chunk + * error. + * PNG_HANDLE_CHUNK_ALWAYS: + * Keep the chunk data. + * + * If the chunk data is saved it can be retrieved using png_get_unknown_chunks, + * below. Notice that specifying "AS_DEFAULT" as a global default is equivalent + * to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks + * it simply resets the behavior to the libpng default. + * + * The per-chunk handling is always used when there is a png_user_chunk_ptr + * callback and the callback returns 0; the chunk is then always stored *unless* + * it is critical and the per-chunk setting is other than ALWAYS. Notice that + * the global default is *not* used in this case. (In effect the per-chunk + * value is incremented to at least IF_SAFE.) + * + * PNG_HANDLE_AS_UNKNOWN_SUPPORTED: + * If this is *not* set known chunks will always be handled by libpng and + * will never be stored in the unknown chunk list. Known chunks listed to + * png_set_keep_unknown_chunks will have no effect. If it is set then known + * chunks listed with a keep other than AS_DEFAULT will *never* be processed + * by libpng, in addition critical chunks must either be processed by the + * callback or saved. + * + * The IHDR and IEND chunks must not be listed. Because this turns off the + * default handling for chunks that would otherwise be recognized the + * behavior of libpng transformations may well become incorrect! + * + * WRITE: + * When writing chunks the options only apply to the chunks specified by + * png_set_unknown_chunks (below), libpng will *always* write known chunks + * required by png_set_ calls and will always write the core critical chunks + * (as required for PLTE). + * + * Each chunk in the png_set_unknown_chunks list is looked up in the + * png_set_keep_unknown_chunks list to find the keep setting, this is then + * interpreted as follows: + * + * PNG_HANDLE_CHUNK_AS_DEFAULT: + * Write safe-to-copy chunks and write other chunks if the global + * default is set to _ALWAYS, otherwise don't write this chunk. + * PNG_HANDLE_CHUNK_NEVER: + * Do not write the chunk. + * PNG_HANDLE_CHUNK_IF_SAFE: + * Write the chunk if it is safe-to-copy, otherwise do not write it. + * PNG_HANDLE_CHUNK_ALWAYS: + * Write the chunk. + * + * Note that the default behavior is effectively the opposite of the read case - + * in read unknown chunks are not stored by default, in write they are written + * by default. Also the behavior of PNG_HANDLE_CHUNK_IF_SAFE is very different + * - on write the safe-to-copy bit is checked, on read the critical bit is + * checked and on read if the chunk is critical an error will be raised. + * + * num_chunks: + * =========== + * If num_chunks is positive, then the "keep" parameter specifies the manner + * for handling only those chunks appearing in the chunk_list array, + * otherwise the chunk list array is ignored. + * + * If num_chunks is 0 the "keep" parameter specifies the default behavior for + * unknown chunks, as described above. + * + * If num_chunks is negative, then the "keep" parameter specifies the manner + * for handling all unknown chunks plus all chunks recognized by libpng + * except for the IHDR, PLTE, tRNS, IDAT, and IEND chunks (which continue to + * be processed by libpng. + */ +PNG_EXPORT(172, void, png_set_keep_unknown_chunks, (png_structrp png_ptr, + int keep, png_const_bytep chunk_list, int num_chunks)); + +/* The "keep" PNG_HANDLE_CHUNK_ parameter for the specified chunk is returned; + * the result is therefore true (non-zero) if special handling is required, + * false for the default handling. */ -PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr, +PNG_EXPORT(173, int, png_handle_as_unknown, (png_const_structrp png_ptr, png_const_bytep chunk_name)); #endif -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED -PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr, - png_infop info_ptr, png_const_unknown_chunkp unknowns, + +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED +PNG_EXPORT(174, void, png_set_unknown_chunks, (png_const_structrp png_ptr, + png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns)); + /* NOTE: prior to 1.6.0 this routine set the 'location' field of the added + * unknowns to the location currently stored in the png_struct. This is + * invariably the wrong value on write. To fix this call the following API + * for each chunk in the list with the correct location. If you know your + * code won't be compiled on earlier versions you can rely on + * png_set_unknown_chunks(write-ptr, png_get_unknown_chunks(read-ptr)) doing + * the correct thing. + */ + PNG_EXPORT(175, void, png_set_unknown_chunk_location, - (png_structp png_ptr, png_infop info_ptr, int chunk, int location)); -PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr, - png_const_infop info_ptr, png_unknown_chunkpp entries)); + (png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location)); + +PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_unknown_chunkpp entries)); #endif /* Png_free_data() will turn off the "valid" flag for anything it frees. * If you need to turn it off for a chunk that your application has freed, * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ -PNG_EXPORT(177, void, png_set_invalid, - (png_structp png_ptr, png_infop info_ptr, int mask)); +PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr, + png_inforp info_ptr, int mask)); #ifdef PNG_INFO_IMAGE_SUPPORTED /* The "params" pointer is currently not used and is for future expansion. */ -PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr, +PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr, int transforms, png_voidp params)); -PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr, +PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr, int transforms, png_voidp params)); #endif PNG_EXPORT(180, png_const_charp, png_get_copyright, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); PNG_EXPORT(181, png_const_charp, png_get_header_ver, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); PNG_EXPORT(182, png_const_charp, png_get_header_version, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); #ifdef PNG_MNG_FEATURES_SUPPORTED -PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr, +PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structrp png_ptr, png_uint_32 mng_features_permitted)); #endif /* For use in png_set_keep_unknown, added to version 1.2.6 */ #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 #define PNG_HANDLE_CHUNK_NEVER 1 #define PNG_HANDLE_CHUNK_IF_SAFE 2 #define PNG_HANDLE_CHUNK_ALWAYS 3 +#define PNG_HANDLE_CHUNK_LAST 4 /* Strip the prepended error numbers ("#nnn ") from error and warning * messages before passing them to the error or warning handler. */ #ifdef PNG_ERROR_NUMBERS_SUPPORTED -PNG_EXPORT(185, void, png_set_strip_error_numbers, - (png_structp png_ptr, +PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr, png_uint_32 strip_mode)); #endif /* Added in libpng-1.2.6 */ #ifdef PNG_SET_USER_LIMITS_SUPPORTED -PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr, +PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); PNG_EXPORT(187, png_uint_32, png_get_user_width_max, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); PNG_EXPORT(188, png_uint_32, png_get_user_height_max, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); /* Added in libpng-1.4.0 */ -PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr, +PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr, png_uint_32 user_chunk_cache_max)); PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); /* Added in libpng-1.4.1 */ -PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr, +PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr, png_alloc_size_t user_chunk_cache_max)); PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); #endif #if defined(PNG_INCH_CONVERSIONS_SUPPORTED) PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, - (png_const_structp png_ptr, png_const_infop info_ptr)); + (png_const_structrp png_ptr, png_const_inforp info_ptr)); PNG_FP_EXPORT(196, float, png_get_x_offset_inches, - (png_const_structp png_ptr, png_const_infop info_ptr)) + (png_const_structrp png_ptr, png_const_inforp info_ptr)) #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, - (png_structp png_ptr, png_const_infop info_ptr)) + (png_const_structrp png_ptr, png_const_inforp info_ptr)) #endif -PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr, - png_const_infop info_ptr)) +PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structrp png_ptr, + png_const_inforp info_ptr)) #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, - (png_structp png_ptr, png_const_infop info_ptr)) + (png_const_structrp png_ptr, png_const_inforp info_ptr)) #endif # ifdef PNG_pHYs_SUPPORTED -PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr, - png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, +PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structrp png_ptr, + png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); # endif /* PNG_pHYs_SUPPORTED */ #endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ /* Added in libpng-1.4.0 */ #ifdef PNG_IO_STATE_SUPPORTED -PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_structp png_ptr)); +PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_const_structrp png_ptr)); + +/* Removed from libpng 1.6; use png_get_io_chunk_type. */ +PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr), + PNG_DEPRECATED) -PNG_EXPORTA(200, png_const_bytep, png_get_io_chunk_name, - (png_structp png_ptr), PNG_DEPRECATED); PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, - (png_const_structp png_ptr)); + (png_const_structrp png_ptr)); /* The flags returned by png_get_io_state() are the following: */ # define PNG_IO_NONE 0x0000 /* no I/O at this moment */ # define PNG_IO_READING 0x0001 /* currently reading */ @@ -2532,12 +2634,12 @@ /* For the reader row callbacks (both progressive and sequential) it is * necessary to find the row in the output image given a row in an interlaced * image, so two more macros: */ -#define PNG_ROW_FROM_PASS_ROW(yIn, pass) \ - (((yIn)<1) + + png_uint_32 warning_or_error; + + char message[64]; +} png_image, *png_imagep; + +/* The samples of the image have one to four channels whose components have + * original values in the range 0 to 1.0: + * + * 1: A single gray or luminance channel (G). + * 2: A gray/luminance channel and an alpha channel (GA). + * 3: Three red, green, blue color channels (RGB). + * 4: Three color channels and an alpha channel (RGBA). + * + * The components are encoded in one of two ways: + * + * a) As a small integer, value 0..255, contained in a single byte. For the + * alpha channel the original value is simply value/255. For the color or + * luminance channels the value is encoded according to the sRGB specification + * and matches the 8-bit format expected by typical display devices. + * + * The color/gray channels are not scaled (pre-multiplied) by the alpha + * channel and are suitable for passing to color management software. + * + * b) As a value in the range 0..65535, contained in a 2-byte integer. All + * channels can be converted to the original value by dividing by 65535; all + * channels are linear. Color channels use the RGB encoding (RGB end-points) of + * the sRGB specification. This encoding is identified by the + * PNG_FORMAT_FLAG_LINEAR flag below. + * + * When the simplified API needs to convert between sRGB and linear colorspaces, + * the actual sRGB transfer curve defined in the sRGB specification (see the + * article at http://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2 + * approximation used elsewhere in libpng. + * + * When an alpha channel is present it is expected to denote pixel coverage + * of the color or luminance channels and is returned as an associated alpha + * channel: the color/gray channels are scaled (pre-multiplied) by the alpha + * value. + * + * The samples are either contained directly in the image data, between 1 and 8 + * bytes per pixel according to the encoding, or are held in a color-map indexed + * by bytes in the image data. In the case of a color-map the color-map entries + * are individual samples, encoded as above, and the image data has one byte per + * pixel to select the relevant sample from the color-map. + */ + +/* PNG_FORMAT_* + * + * #defines to be used in png_image::format. Each #define identifies a + * particular layout of sample data and, if present, alpha values. There are + * separate defines for each of the two component encodings. + * + * A format is built up using single bit flag values. All combinations are + * valid. Formats can be built up from the flag values or you can use one of + * the predefined values below. When testing formats always use the FORMAT_FLAG + * macros to test for individual features - future versions of the library may + * add new flags. + * + * When reading or writing color-mapped images the format should be set to the + * format of the entries in the color-map then png_image_{read,write}_colormap + * called to read or write the color-map and set the format correctly for the + * image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly! + * + * NOTE: libpng can be built with particular features disabled, if you see + * compiler errors because the definition of one of the following flags has been + * compiled out it is because libpng does not have the required support. It is + * possible, however, for the libpng configuration to enable the format on just + * read or just write; in that case you may see an error at run time. You can + * guard against this by checking for the definition of the appropriate + * "_SUPPORTED" macro, one of: + * + * PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED + */ +#define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */ +#define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */ +#define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2 byte channels else 1 byte */ +#define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */ + +#ifdef PNG_FORMAT_BGR_SUPPORTED +# define PNG_FORMAT_FLAG_BGR 0x10U /* BGR colors, else order is RGB */ +#endif + +#ifdef PNG_FORMAT_AFIRST_SUPPORTED +# define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */ +#endif + +/* Commonly used formats have predefined macros. + * + * First the single byte (sRGB) formats: + */ +#define PNG_FORMAT_GRAY 0 +#define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA +#define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST) +#define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR +#define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR) +#define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA) +#define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST) +#define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA) +#define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST) + +/* Then the linear 2-byte formats. When naming these "Y" is used to + * indicate a luminance (gray) channel. + */ +#define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR +#define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA) +#define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR) +#define PNG_FORMAT_LINEAR_RGB_ALPHA \ + (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA) + +/* With color-mapped formats the image data is one byte for each pixel, the byte + * is an index into the color-map which is formatted as above. To obtain a + * color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP + * to one of the above definitions, or you can use one of the definitions below. + */ +#define PNG_FORMAT_RGB_COLORMAP (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_BGR_COLORMAP (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP) +#define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP) + +/* PNG_IMAGE macros + * + * These are convenience macros to derive information from a png_image + * structure. The PNG_IMAGE_SAMPLE_ macros return values appropriate to the + * actual image sample values - either the entries in the color-map or the + * pixels in the image. The PNG_IMAGE_PIXEL_ macros return corresponding values + * for the pixels and will always return 1 for color-mapped formats. The + * remaining macros return information about the rows in the image and the + * complete image. + * + * NOTE: All the macros that take a png_image::format parameter are compile time + * constants if the format parameter is, itself, a constant. Therefore these + * macros can be used in array declarations and case labels where required. + * Similarly the macros are also pre-processor constants (sizeof is not used) so + * they can be used in #if tests. + * + * First the information about the samples. + */ +#define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\ + (((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1) + /* Return the total number of channels in a given format: 1..4 */ + +#define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\ + ((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1) + /* Return the size in bytes of a single component of a pixel or color-map + * entry (as appropriate) in the image: 1 or 2. + */ + +#define PNG_IMAGE_SAMPLE_SIZE(fmt)\ + (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)) + /* This is the size of the sample data for one sample. If the image is + * color-mapped it is the size of one color-map entry (and image pixels are + * one byte in size), otherwise it is the size of one image pixel. + */ + +#define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\ + (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256) + /* The maximum size of the color-map required by the format expressed in a + * count of components. This can be used to compile-time allocate a + * color-map: + * + * png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)]; + * + * png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)]; + * + * Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the + * information from one of the png_image_begin_read_ APIs and dynamically + * allocate the required memory. + */ + +/* Corresponding information about the pixels */ +#define PNG_IMAGE_PIXEL_(test,fmt)\ + (((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt)) + +#define PNG_IMAGE_PIXEL_CHANNELS(fmt)\ + PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt) + /* The number of separate channels (components) in a pixel; 1 for a + * color-mapped image. + */ + +#define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\ + PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt) + /* The size, in bytes, of each component in a pixel; 1 for a color-mapped + * image. + */ + +#define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt) + /* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */ + +/* Information about the whole row, or whole image */ +#define PNG_IMAGE_ROW_STRIDE(image)\ + (PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width) + /* Return the total number of components in a single row of the image; this + * is the minimum 'row stride', the minimum count of components between each + * row. For a color-mapped image this is the minimum number of bytes in a + * row. + */ + +#define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\ + (PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride)) + /* Return the size, in bytes, of an image buffer given a png_image and a row + * stride - the number of components to leave space for in each row. + */ + +#define PNG_IMAGE_SIZE(image)\ + PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image)) + /* Return the size, in bytes, of the image in memory given just a png_image; + * the row stride is the minimum stride required for the image. + */ + +#define PNG_IMAGE_COLORMAP_SIZE(image)\ + (PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries) + /* Return the size, in bytes, of the color-map of this image. If the image + * format is not a color-map format this will return a size sufficient for + * 256 entries in the given format; check PNG_FORMAT_FLAG_COLORMAP if + * you don't want to allocate a color-map in this case. + */ + +/* PNG_IMAGE_FLAG_* + * + * Flags containing additional information about the image are held in the + * 'flags' field of png_image. + */ +#define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01 + /* This indicates the the RGB values of the in-memory bitmap do not + * correspond to the red, green and blue end-points defined by sRGB. + */ + +#define PNG_IMAGE_FLAG_FAST 0x02 + /* On write emphasise speed over compression; the resultant PNG file will be + * larger but will be produced significantly faster, particular for large + * images. Do not use this option for images which will be distributed, only + * used it when producing intermediate files that will be read back in + * repeatedly. For a typical 24-bit image the option will double the read + * speed at the cost of increasing the image size by 25%, however for many + * more compressible images the PNG file can be 10 times larger with only a + * slight speed gain. + */ + +#ifdef PNG_SIMPLIFIED_READ_SUPPORTED +/* READ APIs + * --------- + * + * The png_image passed to the read APIs must have been initialized by setting + * the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.) + */ +#ifdef PNG_STDIO_SUPPORTED +PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image, + const char *file_name)); + /* The named file is opened for read and the image header is filled in + * from the PNG header in the file. + */ + +PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image, + FILE* file)); + /* The PNG header is read from the stdio FILE object. */ +#endif /* PNG_STDIO_SUPPORTED */ + +PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image, + png_const_voidp memory, png_size_t size)); + /* The PNG header is read from the given memory buffer. */ + +PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image, + png_const_colorp background, void *buffer, png_int_32 row_stride, + void *colormap)); + /* Finish reading the image into the supplied buffer and clean up the + * png_image structure. + * + * row_stride is the step, in byte or 2-byte units as appropriate, + * between adjacent rows. A positive stride indicates that the top-most row + * is first in the buffer - the normal top-down arrangement. A negative + * stride indicates that the bottom-most row is first in the buffer. + * + * background need only be supplied if an alpha channel must be removed from + * a png_byte format and the removal is to be done by compositing on a solid + * color; otherwise it may be NULL and any composition will be done directly + * onto the buffer. The value is an sRGB color to use for the background, + * for grayscale output the green channel is used. + * + * background must be supplied when an alpha channel must be removed from a + * single byte color-mapped output format, in other words if: + * + * 1) The original format from png_image_begin_read_from_* had + * PNG_FORMAT_FLAG_ALPHA set. + * 2) The format set by the application does not. + * 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and + * PNG_FORMAT_FLAG_LINEAR *not* set. + * + * For linear output removing the alpha channel is always done by compositing + * on black and background is ignored.: + * + * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set. It must + * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE. + * image->colormap_entries will be updated to the actual number of entries + * written to the colormap; this may be less than the original value. + */ + +PNG_EXPORT(238, void, png_image_free, (png_imagep image)); + /* Free any data allocated by libpng in image->opaque, setting the pointer to + * NULL. May be called at any time after the structure is initialized. + */ +#endif /* PNG_SIMPLIFIED_READ_SUPPORTED */ + +#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED +/* WRITE APIS + * ---------- + * For write you must initialize a png_image structure to describe the image to + * be written. To do this use memset to set the whole structure to 0 then + * initialize fields describing your image. + * + * version: must be set to PNG_IMAGE_VERSION + * opaque: must be initialized to NULL + * width: image width in pixels + * height: image height in rows + * format: the format of the data (image and color-map) you wish to write + * flags: set to 0 unless one of the defined flags applies; set + * PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB + * values do not correspond to the colors in sRGB. + * colormap_entries: set to the number of entries in the color-map (0 to 256) + */ +PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image, + const char *file, int convert_to_8bit, const void *buffer, + png_int_32 row_stride, const void *colormap)); + /* Write the image to the named file. */ + +PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file, + int convert_to_8_bit, const void *buffer, png_int_32 row_stride, + const void *colormap)); + /* Write the image to the given (FILE*). */ + +/* With both write APIs if image is in one of the linear formats with 16-bit + * data then setting convert_to_8_bit will cause the output to be an 8-bit PNG + * gamma encoded according to the sRGB specification, otherwise a 16-bit linear + * encoded PNG file is written. + * + * With color-mapped data formats the colormap parameter point to a color-map + * with at least image->colormap_entries encoded in the specified format. If + * the format is linear the written PNG color-map will be converted to sRGB + * regardless of the convert_to_8_bit flag. + * + * With all APIs row_stride is handled as in the read APIs - it is the spacing + * from one row to the next in component sized units (1 or 2 bytes) and if + * negative indicates a bottom-up row layout in the buffer. + * + * Note that the write API does not support interlacing or sub-8-bit pixels. + */ +#endif /* PNG_SIMPLIFIED_WRITE_SUPPORTED */ +/******************************************************************************* + * END OF SIMPLIFIED API + ******************************************************************************/ #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) -PNG_EXPORT(234, void, png_set_check_for_invalid_index, (png_structp png_ptr, - int allowed)); +PNG_EXPORT(242, void, png_set_check_for_invalid_index, + (png_structrp png_ptr, int allowed)); #endif /* Maintainer: Put new public prototypes here ^, in libpng.3, and project * defs @@ -2661,9 +3212,9 @@ * one to use is one more than this.) Maintainer, remember to add an entry to * scripts/symbols.def as well. */ #ifdef PNG_EXPORT_LAST_ORDINAL - PNG_EXPORT_LAST_ORDINAL(234); + PNG_EXPORT_LAST_ORDINAL(242); #endif #ifdef __cplusplus } diff -ru4NwbB libpng-1.5.13/pngconf.h libpng-1.6.0beta32/pngconf.h --- libpng-1.5.13/pngconf.h 2012-09-27 06:21:19.617001351 -0500 +++ libpng-1.6.0beta32/pngconf.h 2012-11-25 12:40:09.988540371 -0600 @@ -21,35 +21,71 @@ #ifndef PNGCONF_H #define PNGCONF_H -#ifndef PNG_BUILDING_SYMBOL_TABLE -/* PNG_NO_LIMITS_H may be used to turn off the use of the standard C - * definition file for machine specific limits, this may impact the - * correctness of the definitions below (see uses of INT_MAX). - */ -# ifndef PNG_NO_LIMITS_H -# include +/* To do: Do all of this in scripts/pnglibconf.dfa */ +#ifdef PNG_SAFE_LIMITS_SUPPORTED +# ifdef PNG_USER_WIDTH_MAX +# undef PNG_USER_WIDTH_MAX +# define PNG_USER_WIDTH_MAX 1000000L +# endif +# ifdef PNG_USER_HEIGHT_MAX +# undef PNG_USER_HEIGHT_MAX +# define PNG_USER_HEIGHT_MAX 1000000L +# endif +# ifdef PNG_USER_CHUNK_MALLOC_MAX +# undef PNG_USER_CHUNK_MALLOC_MAX +# define PNG_USER_CHUNK_MALLOC_MAX 4000000L # endif +# ifdef PNG_USER_CHUNK_CACHE_MAX +# undef PNG_USER_CHUNK_CACHE_MAX +# define PNG_USER_CHUNK_CACHE_MAX 128 +# endif +#endif + +#ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */ -/* For the memory copy APIs (i.e. the standard definitions of these), - * because this file defines png_memcpy and so on the base APIs must - * be defined here. +/* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C + * compiler for correct compilation. The following header files are required by + * the standard. If your compiler doesn't provide these header files, or they + * do not match the standard, you will need to provide/improve them. */ -# ifdef BSD -# include -# else -# include -# endif +#include +#include -/* For png_FILE_p - this provides the standard definition of a - * FILE +/* Library header files. These header files are all defined by ISOC90; libpng + * expects conformant implementations, however, an ISOC90 conformant system need + * not provide these header files if the functionality cannot be implemented. + * In this case it will be necessary to disable the relevant parts of libpng in + * the build of pnglibconf.h. + * + * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not + * include this unnecessary header file. */ + # ifdef PNG_STDIO_SUPPORTED + /* Required for the definition of FILE: */ # include # endif + +#ifdef PNG_SETJMP_SUPPORTED + /* Required for the definition of jmp_buf and the declaration of longjmp: */ +# include +#endif + +#ifdef PNG_CONVERT_tIME_SUPPORTED + /* Required for struct tm: */ +# include #endif +#endif /* PNG_BUILDING_SYMBOL_TABLE */ + +/* Prior to 1.6.0 it was possible to turn off 'const' in declarations using + * PNG_NO_CONST; this is no longer supported except for data declarations which + * apparently still cause problems in 2011 on some compilers. + */ +#define PNG_CONST const /* backward compatibility only */ + /* This controls optimization of the reading of 16 and 32 bit values * from PNG files. It can be set on a per-app-file basis - it * just changes whether a macro is used when the function is called. * The library builder sets the default; if read functions are not @@ -71,30 +107,15 @@ * below) but still have compiler specific implementations, others * may be changed on a per-file basis when compiling against libpng. */ -/* The PNGARG macro protects us against machines that don't have function - * prototypes (ie K&R style headers). If your compiler does not handle - * function prototypes, define this macro and use the included ansi2knr. - * I've always been able to use _NO_PROTO as the indicator, but you may - * need to drag the empty declaration out in front of here, or change the - * ifdef to suit your own needs. +/* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect + * against legacy (pre ISOC90) compilers that did not understand function + * prototypes. It is not required for modern C compilers. */ #ifndef PNGARG - -# ifdef OF /* zlib prototype munger */ -# define PNGARG(arglist) OF(arglist) -# else - -# ifdef _NO_PROTO -# define PNGARG(arglist) () -# else # define PNGARG(arglist) arglist -# endif /* _NO_PROTO */ - -# endif /* OF */ - -#endif /* PNGARG */ +#endif /* Function calling conventions. * ============================= * Normally it is not necessary to specify to the compiler how to call @@ -218,9 +239,9 @@ # endif /* compiler/api */ /* NOTE: PNGCBAPI always defaults to PNGCAPI. */ # if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD) - ERROR: PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed +# error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed" # endif # if (defined(_MSC_VER) && _MSC_VER < 800) ||\ (defined(__BORLANDC__) && __BORLANDC__ < 0x500) @@ -332,11 +353,12 @@ #endif #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED /* Support for compiler specific function attributes. These are used - * so that where compiler support is available incorrect use of API + * so that where compiler support is available, incorrect use of API * functions in png.h will generate compiler warnings. Added at libpng - * version 1.2.41. + * version 1.2.41. Disabling these removes the warnings but may also produce + * less efficient code. */ # if defined(__GNUC__) # ifndef PNG_USE_RESULT # define PNG_USE_RESULT __attribute__((__warn_unused_result__)) @@ -359,12 +381,16 @@ # define PNG_PRIVATE \ __attribute__((__deprecated__)) # endif # endif +# if ((__GNUC__ != 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1)) +# ifndef PNG_RESTRICT +# define PNG_RESTRICT __restrict +# endif +# endif /* __GNUC__ == 3.0 */ # endif /* __GNUC__ >= 3 */ -# endif /* __GNUC__ */ -# if defined(_MSC_VER) && (_MSC_VER >= 1300) +# elif defined(_MSC_VER) && (_MSC_VER >= 1300) # ifndef PNG_USE_RESULT # define PNG_USE_RESULT /* not supported */ # endif # ifndef PNG_NORETURN @@ -380,8 +406,18 @@ # endif # ifndef PNG_PRIVATE # define PNG_PRIVATE __declspec(deprecated) # endif +# ifndef PNG_RESTRICT +# if (_MSC_VER >= 1400) +# define PNG_RESTRICT __restrict +# endif +# endif + +# elif defined(__WATCOMC__) +# ifndef PNG_RESTRICT +# define PNG_RESTRICT __restrict +# endif # endif /* _MSC_VER */ #endif /* PNG_PEDANTIC_WARNINGS */ #ifndef PNG_DEPRECATED @@ -398,8 +434,11 @@ #endif #ifndef PNG_PRIVATE # define PNG_PRIVATE /* This is a private libpng function */ #endif +#ifndef PNG_RESTRICT +# define PNG_RESTRICT /* The C99 "restrict" feature */ +#endif #ifndef PNG_FP_EXPORT /* A floating point API. */ # ifdef PNG_FLOATING_POINT_SUPPORTED # define PNG_FP_EXPORT(ordinal, type, name, args)\ PNG_EXPORT(ordinal, type, name, args); @@ -415,184 +454,162 @@ # define PNG_FIXED_EXPORT(ordinal, type, name, args) # endif #endif -/* The following uses const char * instead of char * for error - * and warning message functions, so some compilers won't complain. - * If you do not want to use const, define PNG_NO_CONST here. - * - * This should not change how the APIs are called, so it can be done - * on a per-file basis in the application. - */ -#ifndef PNG_CONST -# ifndef PNG_NO_CONST -# define PNG_CONST const +#ifndef PNG_BUILDING_SYMBOL_TABLE +/* Some typedefs to get us started. These should be safe on most of the common + * platforms. + * + * png_uint_32 and png_int_32 may, currently, be larger than required to hold a + * 32-bit value however this is not normally advisable. + * + * png_uint_16 and png_int_16 should always be two bytes in size - this is + * verified at library build time. + * + * png_byte must always be one byte in size. + * + * The checks below use constants from limits.h, as defined by the ISOC90 + * standard. + */ +#if CHAR_BIT == 8 && UCHAR_MAX == 255 + typedef unsigned char png_byte; # else -# define PNG_CONST -# endif +# error "libpng requires 8 bit bytes" #endif -/* Some typedefs to get us started. These should be safe on most of the - * common platforms. The typedefs should be at least as large as the - * numbers suggest (a png_uint_32 must be at least 32 bits long), but they - * don't have to be exactly that size. Some compilers dislike passing - * unsigned shorts as function parameters, so you may be better off using - * unsigned int for png_uint_16. - */ - -#if defined(INT_MAX) && (INT_MAX > 0x7ffffffeL) -typedef unsigned int png_uint_32; -typedef int png_int_32; +#if INT_MIN == -32768 && INT_MAX == 32767 + typedef int png_int_16; +#elif SHRT_MIN == -32768 && SHRT_MAX == 32767 + typedef short png_int_16; #else -typedef unsigned long png_uint_32; -typedef long png_int_32; +# error "libpng requires a signed 16 bit type" #endif -typedef unsigned short png_uint_16; -typedef short png_int_16; -typedef unsigned char png_byte; -#ifdef PNG_NO_SIZE_T -typedef unsigned int png_size_t; +#if UINT_MAX == 65535 + typedef unsigned int png_uint_16; +#elif USHRT_MAX == 65535 + typedef unsigned short png_uint_16; #else -typedef size_t png_size_t; +# error "libpng requires an unsigned 16 bit type" #endif -#define png_sizeof(x) (sizeof (x)) -/* The following is needed for medium model support. It cannot be in the - * pngpriv.h header. Needs modification for other compilers besides - * MSC. Model independent support declares all arrays and pointers to be - * large using the far keyword. The zlib version used must also support - * model independent data. As of version zlib 1.0.4, the necessary changes - * have been made in zlib. The USE_FAR_KEYWORD define triggers other - * changes that are needed. (Tim Wegner) - */ - -/* Separate compiler dependencies (problem here is that zlib.h always - * defines FAR. (SJT) - */ -#ifdef __BORLANDC__ -# if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__) -# define LDATA 1 +#if INT_MIN < -2147483646 && INT_MAX > 2147483646 + typedef int png_int_32; +#elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646 + typedef long int png_int_32; # else -# define LDATA 0 -# endif - /* GRR: why is Cygwin in here? Cygwin is not Borland C... */ -# if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__) -# define PNG_MAX_MALLOC_64K /* only used in build */ -# if (LDATA != 1) -# ifndef FAR -# define FAR __far +# error "libpng requires a signed 32 bit (or more) type" # endif -# define USE_FAR_KEYWORD -# endif /* LDATA != 1 */ - /* Possibly useful for moving data out of default segment. - * Uncomment it if you want. Could also define FARDATA as - * const if your compiler supports it. (SJT) -# define FARDATA FAR - */ -# endif /* __WIN32__, __FLAT__, __CYGWIN__ */ -#endif /* __BORLANDC__ */ +#if UINT_MAX > 4294967294 + typedef unsigned int png_uint_32; +#elif ULONG_MAX > 4294967294 + typedef unsigned long int png_uint_32; +#else +# error "libpng requires an unsigned 32 bit (or more) type" +#endif -/* Suggest testing for specific compiler first before testing for - * FAR. The Watcom compiler defines both __MEDIUM__ and M_I86MM, - * making reliance oncertain keywords suspect. (SJT) +/* Prior to 1.6.0 it was possible to disable the use of size_t, 1.6.0, however, + * requires an ISOC90 compiler and relies on consistent behavior of sizeof. */ +typedef size_t png_size_t; +typedef ptrdiff_t png_ptrdiff_t; -/* MSC Medium model */ -#ifdef FAR -# ifdef M_I86MM -# define USE_FAR_KEYWORD -# define FARDATA FAR -# include +/* libpng needs to know the maximum value of 'size_t' and this controls the + * definition of png_alloc_size_t, below. This maximum value of size_t limits + * but does not control the maximum allocations the library makes - there is + * direct application control of this through png_set_user_limits(). + */ +#ifndef PNG_SMALL_SIZE_T + /* Compiler specific tests for systems where size_t is known to be less than + * 32 bits (some of these systems may no longer work because of the lack of + * 'far' support; see above.) + */ +# if (defined(__TURBOC__) && !defined(__FLAT__)) ||\ + (defined(_MSC_VER) && defined(MAXSEG_64K)) +# define PNG_SMALL_SIZE_T # endif #endif -/* SJT: default case */ -#ifndef FAR -# define FAR +/* png_alloc_size_t is guaranteed to be no smaller than png_size_t, and no + * smaller than png_uint_32. Casts from png_size_t or png_uint_32 to + * png_alloc_size_t are not necessary; in fact, it is recommended not to use + * them at all so that the compiler can complain when something turns out to be + * problematic. + * + * Casts in the other direction (from png_alloc_size_t to png_size_t or + * png_uint_32) should be explicitly applied; however, we do not expect to + * encounter practical situations that require such conversions. + * + * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than + * 4294967295 - i.e. less than the maximum value of png_uint_32. + */ +#ifdef PNG_SMALL_SIZE_T + typedef png_uint_32 png_alloc_size_t; +#else + typedef png_size_t png_alloc_size_t; #endif -/* At this point FAR is always defined */ -#ifndef FARDATA -# define FARDATA -#endif +/* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler + * implementations of Intel CPU specific support of user-mode segmented address + * spaces, where 16-bit pointers address more than 65536 bytes of memory using + * separate 'segment' registers. The implementation requires two different + * types of pointer (only one of which includes the segment value.) + * + * If required this support is available in version 1.2 of libpng and may be + * available in versions through 1.5, although the correctness of the code has + * not been verified recently. + */ -/* Typedef for floating-point numbers that are converted - * to fixed-point with a multiple of 100,000, e.g., gamma +/* Typedef for floating-point numbers that are converted to fixed-point with a + * multiple of 100,000, e.g., gamma */ typedef png_int_32 png_fixed_point; /* Add typedefs for pointers */ -typedef void FAR * png_voidp; -typedef PNG_CONST void FAR * png_const_voidp; -typedef png_byte FAR * png_bytep; -typedef PNG_CONST png_byte FAR * png_const_bytep; -typedef png_uint_32 FAR * png_uint_32p; -typedef PNG_CONST png_uint_32 FAR * png_const_uint_32p; -typedef png_int_32 FAR * png_int_32p; -typedef PNG_CONST png_int_32 FAR * png_const_int_32p; -typedef png_uint_16 FAR * png_uint_16p; -typedef PNG_CONST png_uint_16 FAR * png_const_uint_16p; -typedef png_int_16 FAR * png_int_16p; -typedef PNG_CONST png_int_16 FAR * png_const_int_16p; -typedef char FAR * png_charp; -typedef PNG_CONST char FAR * png_const_charp; -typedef png_fixed_point FAR * png_fixed_point_p; -typedef PNG_CONST png_fixed_point FAR * png_const_fixed_point_p; -typedef png_size_t FAR * png_size_tp; -typedef PNG_CONST png_size_t FAR * png_const_size_tp; +typedef void * png_voidp; +typedef const void * png_const_voidp; +typedef png_byte * png_bytep; +typedef const png_byte * png_const_bytep; +typedef png_uint_32 * png_uint_32p; +typedef const png_uint_32 * png_const_uint_32p; +typedef png_int_32 * png_int_32p; +typedef const png_int_32 * png_const_int_32p; +typedef png_uint_16 * png_uint_16p; +typedef const png_uint_16 * png_const_uint_16p; +typedef png_int_16 * png_int_16p; +typedef const png_int_16 * png_const_int_16p; +typedef char * png_charp; +typedef const char * png_const_charp; +typedef png_fixed_point * png_fixed_point_p; +typedef const png_fixed_point * png_const_fixed_point_p; +typedef png_size_t * png_size_tp; +typedef const png_size_t * png_const_size_tp; #ifdef PNG_STDIO_SUPPORTED typedef FILE * png_FILE_p; #endif #ifdef PNG_FLOATING_POINT_SUPPORTED -typedef double FAR * png_doublep; -typedef PNG_CONST double FAR * png_const_doublep; +typedef double * png_doublep; +typedef const double * png_const_doublep; #endif /* Pointers to pointers; i.e. arrays */ -typedef png_byte FAR * FAR * png_bytepp; -typedef png_uint_32 FAR * FAR * png_uint_32pp; -typedef png_int_32 FAR * FAR * png_int_32pp; -typedef png_uint_16 FAR * FAR * png_uint_16pp; -typedef png_int_16 FAR * FAR * png_int_16pp; -typedef PNG_CONST char FAR * FAR * png_const_charpp; -typedef char FAR * FAR * png_charpp; -typedef png_fixed_point FAR * FAR * png_fixed_point_pp; +typedef png_byte * * png_bytepp; +typedef png_uint_32 * * png_uint_32pp; +typedef png_int_32 * * png_int_32pp; +typedef png_uint_16 * * png_uint_16pp; +typedef png_int_16 * * png_int_16pp; +typedef const char * * png_const_charpp; +typedef char * * png_charpp; +typedef png_fixed_point * * png_fixed_point_pp; #ifdef PNG_FLOATING_POINT_SUPPORTED -typedef double FAR * FAR * png_doublepp; +typedef double * * png_doublepp; #endif /* Pointers to pointers to pointers; i.e., pointer to array */ -typedef char FAR * FAR * FAR * png_charppp; +typedef char * * * png_charppp; -/* png_alloc_size_t is guaranteed to be no smaller than png_size_t, - * and no smaller than png_uint_32. Casts from png_size_t or png_uint_32 - * to png_alloc_size_t are not necessary; in fact, it is recommended - * not to use them at all so that the compiler can complain when something - * turns out to be problematic. - * Casts in the other direction (from png_alloc_size_t to png_size_t or - * png_uint_32) should be explicitly applied; however, we do not expect - * to encounter practical situations that require such conversions. - */ -#if defined(__TURBOC__) && !defined(__FLAT__) - typedef unsigned long png_alloc_size_t; -#else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - typedef unsigned long png_alloc_size_t; -# else - /* This is an attempt to detect an old Windows system where (int) is - * actually 16 bits, in that case png_malloc must have an argument with a - * bigger size to accomodate the requirements of the library. - */ -# if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \ - (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL) - typedef DWORD png_alloc_size_t; -# else - typedef png_size_t png_alloc_size_t; -# endif -# endif -#endif +#endif /* PNG_BUILDING_SYMBOL_TABLE */ #endif /* PNGCONF_H */ diff -ru4NwbB libpng-1.5.13/pngerror.c libpng-1.6.0beta32/pngerror.c --- libpng-1.5.13/pngerror.c 2012-09-27 06:21:19.673144509 -0500 +++ libpng-1.6.0beta32/pngerror.c 2012-11-25 12:40:10.051787848 -0600 @@ -1,9 +1,9 @@ /* pngerror.c - stub functions for i/o and memory allocation * - * Last changed in libpng 1.5.8 [February 1, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This code is released under the libpng license. @@ -19,14 +19,14 @@ #include "pngpriv.h" #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) -static PNG_FUNCTION(void, png_default_error,PNGARG((png_structp png_ptr, +static PNG_FUNCTION(void, png_default_error,PNGARG((png_const_structrp png_ptr, png_const_charp error_message)),PNG_NORETURN); #ifdef PNG_WARNINGS_SUPPORTED static void /* PRIVATE */ -png_default_warning PNGARG((png_structp png_ptr, +png_default_warning PNGARG((png_const_structrp png_ptr, png_const_charp warning_message)); #endif /* PNG_WARNINGS_SUPPORTED */ /* This function is called whenever there is a fatal error. This function @@ -35,9 +35,10 @@ * to replace the error function at run-time. */ #ifdef PNG_ERROR_TEXT_SUPPORTED PNG_FUNCTION(void,PNGAPI -png_error,(png_structp png_ptr, png_const_charp error_message),PNG_NORETURN) +png_error,(png_const_structrp png_ptr, png_const_charp error_message), + PNG_NORETURN) { #ifdef PNG_ERROR_NUMBERS_SUPPORTED char msg[16]; if (png_ptr != NULL) @@ -78,25 +79,26 @@ } } #endif if (png_ptr != NULL && png_ptr->error_fn != NULL) - (*(png_ptr->error_fn))(png_ptr, error_message); + (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), + error_message); /* If the custom handler doesn't exist, or if it returns, use the default handler, which will not return. */ png_default_error(png_ptr, error_message); } #else PNG_FUNCTION(void,PNGAPI -png_err,(png_structp png_ptr),PNG_NORETURN) +png_err,(png_const_structrp png_ptr),PNG_NORETURN) { /* Prior to 1.5.2 the error_fn received a NULL pointer, expressed * erroneously as '\0', instead of the empty string "". This was * apparently an error, introduced in libpng-1.2.20, and png_default_error * will crash in this case. */ if (png_ptr != NULL && png_ptr->error_fn != NULL) - (*(png_ptr->error_fn))(png_ptr, ""); + (*(png_ptr->error_fn))(png_constcast(png_structrp,png_ptr), ""); /* If the custom handler doesn't exist, or if it returns, use the default handler, which will not return. */ png_default_error(png_ptr, ""); @@ -210,9 +212,9 @@ * you should supply a replacement warning function and use * png_set_error_fn() to replace the warning function at run-time. */ void PNGAPI -png_warning(png_structp png_ptr, png_const_charp warning_message) +png_warning(png_const_structrp png_ptr, png_const_charp warning_message) { int offset = 0; if (png_ptr != NULL) { @@ -229,9 +231,10 @@ } } } if (png_ptr != NULL && png_ptr->warning_fn != NULL) - (*(png_ptr->warning_fn))(png_ptr, warning_message + offset); + (*(png_ptr->warning_fn))(png_constcast(png_structrp,png_ptr), + warning_message + offset); else png_default_warning(png_ptr, warning_message + offset); } @@ -277,9 +280,9 @@ png_warning_parameter(p, number, str); } void -png_formatted_warning(png_structp png_ptr, png_warning_parameters p, +png_formatted_warning(png_const_structrp png_ptr, png_warning_parameters p, png_const_charp message) { /* The internal buffer is just 192 bytes - enough for all our messages, * overflow doesn't happen because this code checks! If someone figures @@ -345,26 +348,61 @@ /* i is always less than (sizeof msg), so: */ msg[i] = '\0'; - /* And this is the formatted message, it may be larger than - * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these are - * not (currently) formatted. + /* And this is the formatted message. It may be larger than + * PNG_MAX_ERROR_TEXT, but that is only used for 'chunk' errors and these + * are not (currently) formatted. */ png_warning(png_ptr, msg); } #endif /* PNG_WARNINGS_SUPPORTED */ #ifdef PNG_BENIGN_ERRORS_SUPPORTED void PNGAPI -png_benign_error(png_structp png_ptr, png_const_charp error_message) +png_benign_error(png_const_structrp png_ptr, png_const_charp error_message) { if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) + { +# ifdef PNG_READ_SUPPORTED + if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && + png_ptr->chunk_name != 0) + png_chunk_warning(png_ptr, error_message); + else +# endif + png_warning(png_ptr, error_message); + } + + else + { +# ifdef PNG_READ_SUPPORTED + if ((png_ptr->mode & PNG_IS_READ_STRUCT) != 0 && + png_ptr->chunk_name != 0) + png_chunk_error(png_ptr, error_message); + else +# endif + png_error(png_ptr, error_message); + } +} + +void /* PRIVATE */ +png_app_warning(png_const_structrp png_ptr, png_const_charp error_message) +{ + if (png_ptr->flags & PNG_FLAG_APP_WARNINGS_WARN) png_warning(png_ptr, error_message); else png_error(png_ptr, error_message); } -#endif + +void /* PRIVATE */ +png_app_error(png_const_structrp png_ptr, png_const_charp error_message) +{ + if (png_ptr->flags & PNG_FLAG_APP_ERRORS_WARN) + png_warning(png_ptr, error_message); + else + png_error(png_ptr, error_message); +} +#endif /* BENIGN_ERRORS */ /* These utilities are used internally to build an error message that relates * to the current chunk. The chunk name comes from png_ptr->chunk_name, * this is used to prefix the message. The message is limited in length @@ -376,12 +414,12 @@ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; -#define PNG_MAX_ERROR_TEXT 64 +#define PNG_MAX_ERROR_TEXT 196 /* Currently limited be profile_error in png.c */ #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_ERROR_TEXT_SUPPORTED) static void /* PRIVATE */ -png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp +png_format_buffer(png_const_structrp png_ptr, png_charp buffer, png_const_charp error_message) { png_uint_32 chunk_name = png_ptr->chunk_name; int iout = 0, ishift = 24; @@ -425,9 +463,9 @@ #endif /* PNG_WARNINGS_SUPPORTED || PNG_ERROR_TEXT_SUPPORTED */ #if defined(PNG_READ_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) PNG_FUNCTION(void,PNGAPI -png_chunk_error,(png_structp png_ptr, png_const_charp error_message), +png_chunk_error,(png_const_structrp png_ptr, png_const_charp error_message), PNG_NORETURN) { char msg[18+PNG_MAX_ERROR_TEXT]; if (png_ptr == NULL) @@ -442,9 +480,9 @@ #endif /* PNG_READ_SUPPORTED && PNG_ERROR_TEXT_SUPPORTED */ #ifdef PNG_WARNINGS_SUPPORTED void PNGAPI -png_chunk_warning(png_structp png_ptr, png_const_charp warning_message) +png_chunk_warning(png_const_structrp png_ptr, png_const_charp warning_message) { char msg[18+PNG_MAX_ERROR_TEXT]; if (png_ptr == NULL) png_warning(png_ptr, warning_message); @@ -459,9 +497,10 @@ #ifdef PNG_READ_SUPPORTED #ifdef PNG_BENIGN_ERRORS_SUPPORTED void PNGAPI -png_chunk_benign_error(png_structp png_ptr, png_const_charp error_message) +png_chunk_benign_error(png_const_structrp png_ptr, png_const_charp + error_message) { if (png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN) png_chunk_warning(png_ptr, error_message); @@ -470,18 +509,53 @@ } #endif #endif /* PNG_READ_SUPPORTED */ +void /* PRIVATE */ +png_chunk_report(png_const_structrp png_ptr, png_const_charp message, int error) +{ + /* This is always supported, but for just read or just write it + * unconditionally does the right thing. + */ +# if (defined PNG_READ_SUPPORTED) && (defined PNG_WRITE_SUPPORTED) + if (png_ptr->mode & PNG_IS_READ_STRUCT) +# endif + +# ifdef PNG_READ_SUPPORTED + { + if (error < PNG_CHUNK_ERROR) + png_chunk_warning(png_ptr, message); + + else + png_chunk_benign_error(png_ptr, message); + } +# endif + +# if (defined PNG_READ_SUPPORTED) && (defined PNG_WRITE_SUPPORTED) + else if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) +# endif + +# ifdef PNG_WRITE_SUPPORTED + { + if (error < PNG_CHUNK_WRITE_ERROR) + png_app_warning(png_ptr, message); + + else + png_app_error(png_ptr, message); + } +# endif +} + #ifdef PNG_ERROR_TEXT_SUPPORTED #ifdef PNG_FLOATING_POINT_SUPPORTED PNG_FUNCTION(void, -png_fixed_error,(png_structp png_ptr, png_const_charp name),PNG_NORETURN) +png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN) { # define fixed_message "fixed point overflow in " # define fixed_message_ln ((sizeof fixed_message)-1) int iin; char msg[fixed_message_ln+PNG_MAX_ERROR_TEXT]; - png_memcpy(msg, fixed_message, fixed_message_ln); + memcpy(msg, fixed_message, fixed_message_ln); iin = 0; if (name != NULL) while (iin < (PNG_MAX_ERROR_TEXT-1) && name[iin] != 0) { msg[fixed_message_ln + iin] = name[iin]; @@ -497,16 +571,113 @@ /* This API only exists if ANSI-C style error handling is used, * otherwise it is necessary for png_default_error to be overridden. */ jmp_buf* PNGAPI -png_set_longjmp_fn(png_structp png_ptr, png_longjmp_ptr longjmp_fn, +png_set_longjmp_fn(png_structrp png_ptr, png_longjmp_ptr longjmp_fn, size_t jmp_buf_size) { - if (png_ptr == NULL || jmp_buf_size != png_sizeof(jmp_buf)) + /* From libpng 1.6.0 the app gets one chance to set a 'jmpbuf_size' value + * and it must not change after that. Libpng doesn't care how big the + * buffer is, just that it doesn't change. + * + * If the buffer size is no *larger* than the size of jmp_buf when libpng is + * compiled a built in jmp_buf is returned; this preserves the pre-1.6.0 + * semantics that this call will not fail. If the size is larger, however, + * the buffer is allocated and this may fail, causing the function to return + * NULL. + */ + if (png_ptr == NULL) return NULL; + if (png_ptr->jmp_buf_ptr == NULL) + { + png_ptr->jmp_buf_size = 0; /* not allocated */ + + if (jmp_buf_size <= (sizeof png_ptr->jmp_buf_local)) + png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; + + else + { + png_ptr->jmp_buf_ptr = png_voidcast(jmp_buf *, + png_malloc_warn(png_ptr, jmp_buf_size)); + + if (png_ptr->jmp_buf_ptr == NULL) + return NULL; /* new NULL return on OOM */ + + png_ptr->jmp_buf_size = jmp_buf_size; + } + } + + else /* Already allocated: check the size */ + { + size_t size = png_ptr->jmp_buf_size; + + if (size == 0) + { + size = (sizeof png_ptr->jmp_buf_local); + if (png_ptr->jmp_buf_ptr != &png_ptr->jmp_buf_local) + { + /* This is an internal error in libpng: somehow we have been left + * with a stack allocated jmp_buf when the application regained + * control. It's always possible to fix this up, but for the moment + * this is a png_error because that makes it easy to detect. + */ + png_error(png_ptr, "Libpng jmp_buf still allocated"); + /* png_ptr->jmp_buf_ptr = &png_ptr->jmp_buf_local; */ + } + } + + if (size != jmp_buf_size) + { + png_warning(png_ptr, "Application jmp_buf size changed"); + return NULL; /* caller will probably crash: no choice here */ + } + } + + /* Finally fill in the function, now we have a satisfactory buffer. It is + * valid to change the function on every call. + */ png_ptr->longjmp_fn = longjmp_fn; - return &png_ptr->longjmp_buffer; + return png_ptr->jmp_buf_ptr; +} + +void /* PRIVATE */ +png_free_jmpbuf(png_structrp png_ptr) +{ + if (png_ptr != NULL) + { + jmp_buf *jb = png_ptr->jmp_buf_ptr; + + /* A size of 0 is used to indicate a local, stack, allocation of the + * pointer; used here and in png.c + */ + if (jb != NULL && png_ptr->jmp_buf_size > 0) + { + + /* This stuff is so that a failure to free the error control structure + * does not leave libpng in a state with no valid error handling: the + * free always succeeds, if there is an error it gets ignored. + */ + if (jb != &png_ptr->jmp_buf_local) + { + /* Make an internal, libpng, jmp_buf to return here */ + jmp_buf free_jmp_buf; + + if (!setjmp(free_jmp_buf)) + { + png_ptr->jmp_buf_ptr = &free_jmp_buf; /* come back here */ + png_ptr->jmp_buf_size = 0; /* stack allocation */ + png_ptr->longjmp_fn = longjmp; + png_free(png_ptr, jb); /* Return to setjmp on error */ + } + } + } + + /* *Always* cancel everything out: */ + png_ptr->jmp_buf_size = 0; + png_ptr->jmp_buf_ptr = NULL; + png_ptr->longjmp_fn = 0; + } } #endif /* This is the default error handling function. Note that replacements for @@ -514,9 +685,9 @@ * function is used by default, or if the program supplies NULL for the * error function pointer in png_set_error_fn(). */ static PNG_FUNCTION(void /* PRIVATE */, -png_default_error,(png_structp png_ptr, png_const_charp error_message), +png_default_error,(png_const_structrp png_ptr, png_const_charp error_message), PNG_NORETURN) { #ifdef PNG_CONSOLE_IO_SUPPORTED #ifdef PNG_ERROR_NUMBERS_SUPPORTED @@ -561,25 +732,15 @@ png_longjmp(png_ptr, 1); } PNG_FUNCTION(void,PNGAPI -png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN) +png_longjmp,(png_const_structrp png_ptr, int val),PNG_NORETURN) { #ifdef PNG_SETJMP_SUPPORTED - if (png_ptr && png_ptr->longjmp_fn) - { -# ifdef USE_FAR_KEYWORD - { - jmp_buf tmp_jmpbuf; - png_memcpy(tmp_jmpbuf, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); - png_ptr->longjmp_fn(tmp_jmpbuf, val); - } - -# else - png_ptr->longjmp_fn(png_ptr->longjmp_buffer, val); -# endif - } + if (png_ptr && png_ptr->longjmp_fn && png_ptr->jmp_buf_ptr) + png_ptr->longjmp_fn(*png_ptr->jmp_buf_ptr, val); #endif + /* Here if not setjmp support or if png_ptr is null. */ PNG_ABORT(); } @@ -589,9 +750,9 @@ * here if you don't want them to. In the default configuration, png_ptr is * not used, but it is passed in case it may be useful. */ static void /* PRIVATE */ -png_default_warning(png_structp png_ptr, png_const_charp warning_message) +png_default_warning(png_const_structrp png_ptr, png_const_charp warning_message) { #ifdef PNG_CONSOLE_IO_SUPPORTED # ifdef PNG_ERROR_NUMBERS_SUPPORTED if (*warning_message == PNG_LITERAL_SHARP) @@ -636,12 +797,12 @@ /* This function is called when the application wants to use another method * of handling errors and warnings. Note that the error function MUST NOT * return to the calling routine or serious problems will occur. The return - * method used in the default routine calls longjmp(png_ptr->longjmp_buffer, 1) + * method used in the default routine calls longjmp(png_ptr->jmp_buf_ptr, 1) */ void PNGAPI -png_set_error_fn(png_structp png_ptr, png_voidp error_ptr, +png_set_error_fn(png_structrp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn) { if (png_ptr == NULL) return; @@ -660,9 +821,9 @@ * functions. The application should free any memory associated with this * pointer before png_write_destroy and png_read_destroy are called. */ png_voidp PNGAPI -png_get_error_ptr(png_const_structp png_ptr) +png_get_error_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return NULL; @@ -671,9 +832,9 @@ #ifdef PNG_ERROR_NUMBERS_SUPPORTED void PNGAPI -png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode) +png_set_strip_error_numbers(png_structrp png_ptr, png_uint_32 strip_mode) { if (png_ptr != NULL) { png_ptr->flags &= @@ -681,5 +842,91 @@ PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode); } } #endif + +#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\ + defined PNG_SIMPLIFIED_WRITE_SUPPORTED + /* Currently the above both depend on SETJMP_SUPPORTED, however it would be + * possible to implement without setjmp support just so long as there is some + * way to handle the error return here: + */ +PNG_FUNCTION(void /* PRIVATE */, +png_safe_error,(png_structp png_nonconst_ptr, png_const_charp error_message), + PNG_NORETURN) +{ + const png_const_structrp png_ptr = png_nonconst_ptr; + png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr); + + /* An error is always logged here, overwriting anything (typically a warning) + * that is already there: + */ + if (image != NULL) + { + png_safecat(image->message, (sizeof image->message), 0, error_message); + image->warning_or_error |= PNG_IMAGE_ERROR; + + /* Retrieve the jmp_buf from within the png_control, making this work for + * C++ compilation too is pretty tricky: C++ wants a pointer to the first + * element of a jmp_buf, but C doesn't tell us the type of that. + */ + if (image->opaque != NULL && image->opaque->error_buf != NULL) + longjmp(png_control_jmp_buf(image->opaque), 1); + + /* Missing longjmp buffer, the following is to help debugging: */ + { + size_t pos = png_safecat(image->message, (sizeof image->message), 0, + "bad longjmp: "); + png_safecat(image->message, (sizeof image->message), pos, + error_message); + } + } + + /* Here on an internal programming error. */ + abort(); +} + +#ifdef PNG_WARNINGS_SUPPORTED +void /* PRIVATE */ +png_safe_warning(png_structp png_nonconst_ptr, png_const_charp warning_message) +{ + const png_const_structrp png_ptr = png_nonconst_ptr; + png_imagep image = png_voidcast(png_imagep, png_ptr->error_ptr); + + /* A warning is only logged if there is no prior warning or error. */ + if (image->warning_or_error == 0) + { + png_safecat(image->message, (sizeof image->message), 0, warning_message); + image->warning_or_error |= PNG_IMAGE_WARNING; + } +} +#endif + +int /* PRIVATE */ +png_safe_execute(png_imagep image_in, int (*function)(png_voidp), png_voidp arg) +{ + volatile png_imagep image = image_in; + volatile int result; + volatile png_voidp saved_error_buf; + jmp_buf safe_jmpbuf; + + /* Safely execute function(arg) with png_error returning to this function. */ + saved_error_buf = image->opaque->error_buf; + result = setjmp(safe_jmpbuf) == 0; + + if (result) + { + + image->opaque->error_buf = safe_jmpbuf; + result = function(arg); + } + + image->opaque->error_buf = saved_error_buf; + + /* And do the cleanup prior to any failure return. */ + if (!result) + png_image_free(image); + + return result; +} +#endif /* SIMPLIFIED READ/WRITE */ #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/pngget.c libpng-1.6.0beta32/pngget.c --- libpng-1.5.13/pngget.c 2012-09-27 06:21:19.681564020 -0500 +++ libpng-1.6.0beta32/pngget.c 2012-11-25 12:40:10.060652758 -0600 @@ -1,9 +1,9 @@ /* pngget.c - retrieval of values from info struct * - * Last changed in libpng 1.5.7 [December 15, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This code is released under the libpng license. @@ -16,9 +16,9 @@ #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) png_uint_32 PNGAPI -png_get_valid(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_valid(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 flag) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->valid & flag); @@ -26,9 +26,9 @@ return(0); } png_size_t PNGAPI -png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_rowbytes(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->rowbytes); @@ -36,9 +36,9 @@ } #ifdef PNG_INFO_IMAGE_SUPPORTED png_bytepp PNGAPI -png_get_rows(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_rows(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->row_pointers); @@ -48,72 +48,73 @@ #ifdef PNG_EASY_ACCESS_SUPPORTED /* Easy access to info, added in libpng-0.99 */ png_uint_32 PNGAPI -png_get_image_width(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_image_width(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->width; return (0); } png_uint_32 PNGAPI -png_get_image_height(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_image_height(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->height; return (0); } png_byte PNGAPI -png_get_bit_depth(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_bit_depth(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->bit_depth; return (0); } png_byte PNGAPI -png_get_color_type(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_color_type(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->color_type; return (0); } png_byte PNGAPI -png_get_filter_type(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_filter_type(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->filter_type; return (0); } png_byte PNGAPI -png_get_interlace_type(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_interlace_type(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->interlace_type; return (0); } png_byte PNGAPI -png_get_compression_type(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_compression_type(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return info_ptr->compression_type; return (0); } png_uint_32 PNGAPI -png_get_x_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp + info_ptr) { #ifdef PNG_pHYs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { @@ -128,9 +129,10 @@ return (0); } png_uint_32 PNGAPI -png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp + info_ptr) { #ifdef PNG_pHYs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { @@ -145,9 +147,9 @@ return (0); } png_uint_32 PNGAPI -png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_pixels_per_meter(png_const_structrp png_ptr, png_const_inforp info_ptr) { #ifdef PNG_pHYs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { @@ -163,9 +165,10 @@ } #ifdef PNG_FLOATING_POINT_SUPPORTED float PNGAPI -png_get_pixel_aspect_ratio(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_pixel_aspect_ratio(png_const_structrp png_ptr, png_const_inforp + info_ptr) { #ifdef PNG_READ_pHYs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { @@ -174,18 +177,21 @@ if (info_ptr->x_pixels_per_unit != 0) return ((float)((float)info_ptr->y_pixels_per_unit /(float)info_ptr->x_pixels_per_unit)); } +#else + PNG_UNUSED(png_ptr) + PNG_UNUSED(info_ptr) #endif return ((float)0.0); } #endif #ifdef PNG_FIXED_POINT_SUPPORTED png_fixed_point PNGAPI -png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr, - png_const_infop info_ptr) +png_get_pixel_aspect_ratio_fixed(png_const_structrp png_ptr, + png_const_inforp info_ptr) { #ifdef PNG_READ_pHYs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs) && info_ptr->x_pixels_per_unit > 0 && info_ptr->y_pixels_per_unit > 0 @@ -202,16 +208,19 @@ if (png_muldiv(&res, (png_int_32)info_ptr->y_pixels_per_unit, PNG_FP_1, (png_int_32)info_ptr->x_pixels_per_unit)) return res; } +#else + PNG_UNUSED(png_ptr) + PNG_UNUSED(info_ptr) #endif return 0; } #endif png_int_32 PNGAPI -png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr) { #ifdef PNG_oFFs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { @@ -225,9 +234,9 @@ return (0); } png_int_32 PNGAPI -png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_offset_microns(png_const_structrp png_ptr, png_const_inforp info_ptr) { #ifdef PNG_oFFs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { @@ -241,9 +250,9 @@ return (0); } png_int_32 PNGAPI -png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr) { #ifdef PNG_oFFs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { @@ -257,9 +266,9 @@ return (0); } png_int_32 PNGAPI -png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_offset_pixels(png_const_structrp png_ptr, png_const_inforp info_ptr) { #ifdef PNG_oFFs_SUPPORTED if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { @@ -306,28 +315,28 @@ #endif } png_uint_32 PNGAPI -png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) { return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr)); } png_uint_32 PNGAPI -png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) { return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr)); } png_uint_32 PNGAPI -png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_pixels_per_inch(png_const_structrp png_ptr, png_const_inforp info_ptr) { return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr)); } #ifdef PNG_FIXED_POINT_SUPPORTED static png_fixed_point -png_fixed_inches_from_microns(png_structp png_ptr, png_int_32 microns) +png_fixed_inches_from_microns(png_const_structrp png_ptr, png_int_32 microns) { /* Convert from metres * 1,000,000 to inches * 100,000, meters to * inches is simply *(100/2.54), so we want *(10/2.54) == 500/127. * Notice that this can overflow - a warning is output and 0 is @@ -336,29 +345,29 @@ return png_muldiv_warn(png_ptr, microns, 500, 127); } png_fixed_point PNGAPI -png_get_x_offset_inches_fixed(png_structp png_ptr, - png_const_infop info_ptr) +png_get_x_offset_inches_fixed(png_const_structrp png_ptr, + png_const_inforp info_ptr) { return png_fixed_inches_from_microns(png_ptr, png_get_x_offset_microns(png_ptr, info_ptr)); } #endif #ifdef PNG_FIXED_POINT_SUPPORTED png_fixed_point PNGAPI -png_get_y_offset_inches_fixed(png_structp png_ptr, - png_const_infop info_ptr) +png_get_y_offset_inches_fixed(png_const_structrp png_ptr, + png_const_inforp info_ptr) { return png_fixed_inches_from_microns(png_ptr, png_get_y_offset_microns(png_ptr, info_ptr)); } #endif #ifdef PNG_FLOATING_POINT_SUPPORTED float PNGAPI -png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_x_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr) { /* To avoid the overflow do the conversion directly in floating * point. */ @@ -367,9 +376,9 @@ #endif #ifdef PNG_FLOATING_POINT_SUPPORTED float PNGAPI -png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_y_offset_inches(png_const_structrp png_ptr, png_const_inforp info_ptr) { /* To avoid the overflow do the conversion directly in floating * point. */ @@ -378,9 +387,9 @@ #endif #ifdef PNG_pHYs_SUPPORTED png_uint_32 PNGAPI -png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_pHYs_dpi(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) { png_uint_32 retval = 0; @@ -421,29 +430,32 @@ /* png_get_channels really belongs in here, too, but it's been around longer */ #endif /* PNG_EASY_ACCESS_SUPPORTED */ + png_byte PNGAPI -png_get_channels(png_const_structp png_ptr, png_const_infop info_ptr) +png_get_channels(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->channels); return (0); } +#ifdef PNG_READ_SUPPORTED png_const_bytep PNGAPI -png_get_signature(png_const_structp png_ptr, png_infop info_ptr) +png_get_signature(png_const_structrp png_ptr, png_const_inforp info_ptr) { if (png_ptr != NULL && info_ptr != NULL) return(info_ptr->signature); return (NULL); } +#endif #ifdef PNG_bKGD_SUPPORTED png_uint_32 PNGAPI -png_get_bKGD(png_const_structp png_ptr, png_infop info_ptr, +png_get_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, png_color_16p *background) { if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) && background != NULL) @@ -462,125 +474,93 @@ /* The XYZ APIs were added in 1.5.5 to take advantage of the code added at the * same time to correct the rgb grayscale coefficient defaults obtained from the * cHRM chunk in 1.5.4 */ -png_uint_32 PNGFAPI -png_get_cHRM_XYZ_fixed(png_structp png_ptr, png_const_infop info_ptr, - png_fixed_point *int_red_X, png_fixed_point *int_red_Y, - png_fixed_point *int_red_Z, png_fixed_point *int_green_X, - png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, - png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, - png_fixed_point *int_blue_Z) -{ - if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) - { - png_xy xy; - png_XYZ XYZ; - - png_debug1(1, "in %s retrieval function", "cHRM_XYZ"); - - xy.whitex = info_ptr->x_white; - xy.whitey = info_ptr->y_white; - xy.redx = info_ptr->x_red; - xy.redy = info_ptr->y_red; - xy.greenx = info_ptr->x_green; - xy.greeny = info_ptr->y_green; - xy.bluex = info_ptr->x_blue; - xy.bluey = info_ptr->y_blue; - - /* The *_checked function handles error reporting, so just return 0 if - * there is a failure here. - */ - if (png_XYZ_from_xy_checked(png_ptr, &XYZ, xy)) - { - if (int_red_X != NULL) - *int_red_X = XYZ.redX; - if (int_red_Y != NULL) - *int_red_Y = XYZ.redY; - if (int_red_Z != NULL) - *int_red_Z = XYZ.redZ; - if (int_green_X != NULL) - *int_green_X = XYZ.greenX; - if (int_green_Y != NULL) - *int_green_Y = XYZ.greenY; - if (int_green_Z != NULL) - *int_green_Z = XYZ.greenZ; - if (int_blue_X != NULL) - *int_blue_X = XYZ.blueX; - if (int_blue_Y != NULL) - *int_blue_Y = XYZ.blueY; - if (int_blue_Z != NULL) - *int_blue_Z = XYZ.blueZ; - - return (PNG_INFO_cHRM); - } - } - - return (0); -} - # ifdef PNG_FLOATING_POINT_SUPPORTED png_uint_32 PNGAPI -png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_cHRM(png_const_structrp png_ptr, png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x, double *red_y, double *green_x, double *green_y, double *blue_x, double *blue_y) { - if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) + /* Quiet API change: this code used to only return the end points if a cHRM + * chunk was present, but the end points can also come from iCCP or sRGB + * chunks, so in 1.6.0 the png_get_ APIs return the end points regardless and + * the png_set_ APIs merely check that set end points are mutually + * consistent. + */ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) { png_debug1(1, "in %s retrieval function", "cHRM"); if (white_x != NULL) - *white_x = png_float(png_ptr, info_ptr->x_white, "cHRM white X"); + *white_x = png_float(png_ptr, + info_ptr->colorspace.end_points_xy.whitex, "cHRM white X"); if (white_y != NULL) - *white_y = png_float(png_ptr, info_ptr->y_white, "cHRM white Y"); + *white_y = png_float(png_ptr, + info_ptr->colorspace.end_points_xy.whitey, "cHRM white Y"); if (red_x != NULL) - *red_x = png_float(png_ptr, info_ptr->x_red, "cHRM red X"); + *red_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redx, + "cHRM red X"); if (red_y != NULL) - *red_y = png_float(png_ptr, info_ptr->y_red, "cHRM red Y"); + *red_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.redy, + "cHRM red Y"); if (green_x != NULL) - *green_x = png_float(png_ptr, info_ptr->x_green, "cHRM green X"); + *green_x = png_float(png_ptr, + info_ptr->colorspace.end_points_xy.greenx, "cHRM green X"); if (green_y != NULL) - *green_y = png_float(png_ptr, info_ptr->y_green, "cHRM green Y"); + *green_y = png_float(png_ptr, + info_ptr->colorspace.end_points_xy.greeny, "cHRM green Y"); if (blue_x != NULL) - *blue_x = png_float(png_ptr, info_ptr->x_blue, "cHRM blue X"); + *blue_x = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluex, + "cHRM blue X"); if (blue_y != NULL) - *blue_y = png_float(png_ptr, info_ptr->y_blue, "cHRM blue Y"); + *blue_y = png_float(png_ptr, info_ptr->colorspace.end_points_xy.bluey, + "cHRM blue Y"); return (PNG_INFO_cHRM); } return (0); } png_uint_32 PNGAPI -png_get_cHRM_XYZ(png_structp png_ptr, png_const_infop info_ptr, +png_get_cHRM_XYZ(png_const_structrp png_ptr, png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z, double *green_X, double *green_Y, double *green_Z, double *blue_X, double *blue_Y, double *blue_Z) { - png_XYZ XYZ; - - if (png_get_cHRM_XYZ_fixed(png_ptr, info_ptr, - &XYZ.redX, &XYZ.redY, &XYZ.redZ, &XYZ.greenX, &XYZ.greenY, &XYZ.greenZ, - &XYZ.blueX, &XYZ.blueY, &XYZ.blueZ) & PNG_INFO_cHRM) + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) { + png_debug1(1, "in %s retrieval function", "cHRM_XYZ(float)"); + if (red_X != NULL) - *red_X = png_float(png_ptr, XYZ.redX, "cHRM red X"); + *red_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_X, + "cHRM red X"); if (red_Y != NULL) - *red_Y = png_float(png_ptr, XYZ.redY, "cHRM red Y"); + *red_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Y, + "cHRM red Y"); if (red_Z != NULL) - *red_Z = png_float(png_ptr, XYZ.redZ, "cHRM red Z"); + *red_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.red_Z, + "cHRM red Z"); if (green_X != NULL) - *green_X = png_float(png_ptr, XYZ.greenX, "cHRM green X"); + *green_X = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.green_X, "cHRM green X"); if (green_Y != NULL) - *green_Y = png_float(png_ptr, XYZ.greenY, "cHRM green Y"); + *green_Y = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.green_Y, "cHRM green Y"); if (green_Z != NULL) - *green_Z = png_float(png_ptr, XYZ.greenZ, "cHRM green Z"); + *green_Z = png_float(png_ptr, + info_ptr->colorspace.end_points_XYZ.green_Z, "cHRM green Z"); if (blue_X != NULL) - *blue_X = png_float(png_ptr, XYZ.blueX, "cHRM blue X"); + *blue_X = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.blue_X, + "cHRM blue X"); if (blue_Y != NULL) - *blue_Y = png_float(png_ptr, XYZ.blueY, "cHRM blue Y"); + *blue_Y = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.blue_Y, + "cHRM blue Y"); if (blue_Z != NULL) - *blue_Z = png_float(png_ptr, XYZ.blueZ, "cHRM blue Z"); + *blue_Z = png_float(png_ptr, info_ptr->colorspace.end_points_XYZ.blue_Z, + "cHRM blue Z"); return (PNG_INFO_cHRM); } return (0); @@ -588,33 +568,71 @@ # endif # ifdef PNG_FIXED_POINT_SUPPORTED png_uint_32 PNGAPI -png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, + png_fixed_point *int_red_X, png_fixed_point *int_red_Y, + png_fixed_point *int_red_Z, png_fixed_point *int_green_X, + png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, + png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, + png_fixed_point *int_blue_Z) +{ + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) + { + png_debug1(1, "in %s retrieval function", "cHRM_XYZ"); + + if (int_red_X != NULL) + *int_red_X = info_ptr->colorspace.end_points_XYZ.red_X; + if (int_red_Y != NULL) + *int_red_Y = info_ptr->colorspace.end_points_XYZ.red_Y; + if (int_red_Z != NULL) + *int_red_Z = info_ptr->colorspace.end_points_XYZ.red_Z; + if (int_green_X != NULL) + *int_green_X = info_ptr->colorspace.end_points_XYZ.green_X; + if (int_green_Y != NULL) + *int_green_Y = info_ptr->colorspace.end_points_XYZ.green_Y; + if (int_green_Z != NULL) + *int_green_Z = info_ptr->colorspace.end_points_XYZ.green_Z; + if (int_blue_X != NULL) + *int_blue_X = info_ptr->colorspace.end_points_XYZ.blue_X; + if (int_blue_Y != NULL) + *int_blue_Y = info_ptr->colorspace.end_points_XYZ.blue_Y; + if (int_blue_Z != NULL) + *int_blue_Z = info_ptr->colorspace.end_points_XYZ.blue_Z; + return (PNG_INFO_cHRM); + } + + return (0); +} + +png_uint_32 PNGAPI +png_get_cHRM_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x, png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y, png_fixed_point *blue_x, png_fixed_point *blue_y) { png_debug1(1, "in %s retrieval function", "cHRM"); - if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_ENDPOINTS)) { if (white_x != NULL) - *white_x = info_ptr->x_white; + *white_x = info_ptr->colorspace.end_points_xy.whitex; if (white_y != NULL) - *white_y = info_ptr->y_white; + *white_y = info_ptr->colorspace.end_points_xy.whitey; if (red_x != NULL) - *red_x = info_ptr->x_red; + *red_x = info_ptr->colorspace.end_points_xy.redx; if (red_y != NULL) - *red_y = info_ptr->y_red; + *red_y = info_ptr->colorspace.end_points_xy.redy; if (green_x != NULL) - *green_x = info_ptr->x_green; + *green_x = info_ptr->colorspace.end_points_xy.greenx; if (green_y != NULL) - *green_y = info_ptr->y_green; + *green_y = info_ptr->colorspace.end_points_xy.greeny; if (blue_x != NULL) - *blue_x = info_ptr->x_blue; + *blue_x = info_ptr->colorspace.end_points_xy.bluex; if (blue_y != NULL) - *blue_y = info_ptr->y_blue; + *blue_y = info_ptr->colorspace.end_points_xy.bluey; return (PNG_INFO_cHRM); } return (0); @@ -622,51 +640,59 @@ # endif #endif #ifdef PNG_gAMA_SUPPORTED -png_uint_32 PNGFAPI -png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr, +# ifdef PNG_FIXED_POINT_SUPPORTED +png_uint_32 PNGAPI +png_get_gAMA_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, png_fixed_point *file_gamma) { png_debug1(1, "in %s retrieval function", "gAMA"); - if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) - && file_gamma != NULL) + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) && + file_gamma != NULL) { - *file_gamma = info_ptr->gamma; + *file_gamma = info_ptr->colorspace.gamma; return (PNG_INFO_gAMA); } return (0); } +# endif + # ifdef PNG_FLOATING_POINT_SUPPORTED png_uint_32 PNGAPI -png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_gAMA(png_const_structrp png_ptr, png_const_inforp info_ptr, double *file_gamma) { - png_fixed_point igamma; - png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma); - - if (ok) - *file_gamma = png_float(png_ptr, igamma, "png_get_gAMA"); + png_debug1(1, "in %s retrieval function", "gAMA(float)"); - return ok; + if (png_ptr != NULL && info_ptr != NULL && + (info_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_GAMMA) && + file_gamma != NULL) + { + *file_gamma = png_float(png_ptr, info_ptr->colorspace.gamma, + "png_get_gAMA"); + return (PNG_INFO_gAMA); } + return (0); +} # endif #endif #ifdef PNG_sRGB_SUPPORTED png_uint_32 PNGAPI -png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_sRGB(png_const_structrp png_ptr, png_const_inforp info_ptr, int *file_srgb_intent) { png_debug1(1, "in %s retrieval function", "sRGB"); if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB) && file_srgb_intent != NULL) { - *file_srgb_intent = (int)info_ptr->srgb_intent; + *file_srgb_intent = info_ptr->colorspace.rendering_intent; return (PNG_INFO_sRGB); } return (0); @@ -674,9 +700,9 @@ #endif #ifdef PNG_iCCP_SUPPORTED png_uint_32 PNGAPI -png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_iCCP(png_const_structrp png_ptr, png_const_inforp info_ptr, png_charpp name, int *compression_type, png_bytepp profile, png_uint_32 *proflen) { png_debug1(1, "in %s retrieval function", "iCCP"); @@ -686,13 +712,13 @@ proflen != NULL) { *name = info_ptr->iccp_name; *profile = info_ptr->iccp_profile; - /* Compression_type is a dummy so the API won't have to change - * if we introduce multiple compression types later. + *proflen = png_get_uint_32(info_ptr->iccp_profile); + /* This is somewhat irrelevant since the profile data returned has + * actually been uncompressed. */ - *proflen = info_ptr->iccp_proflen; - *compression_type = info_ptr->iccp_compression; + *compression_type = PNG_COMPRESSION_TYPE_BASE; return (PNG_INFO_iCCP); } return (0); @@ -700,9 +726,9 @@ #endif #ifdef PNG_sPLT_SUPPORTED png_uint_32 PNGAPI -png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_sPLT(png_const_structrp png_ptr, png_const_inforp info_ptr, png_sPLT_tpp spalettes) { if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL) { @@ -715,9 +741,9 @@ #endif #ifdef PNG_hIST_SUPPORTED png_uint_32 PNGAPI -png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_hIST(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_16p *hist) { png_debug1(1, "in %s retrieval function", "hIST"); @@ -732,13 +758,12 @@ } #endif png_uint_32 PNGAPI -png_get_IHDR(png_structp png_ptr, png_infop info_ptr, +png_get_IHDR(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, int *interlace_type, int *compression_type, int *filter_type) - { png_debug1(1, "in %s retrieval function", "IHDR"); if (png_ptr == NULL || info_ptr == NULL || width == NULL || @@ -772,9 +797,9 @@ } #ifdef PNG_oFFs_SUPPORTED png_uint_32 PNGAPI -png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_oFFs(png_const_structrp png_ptr, png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type) { png_debug1(1, "in %s retrieval function", "oFFs"); @@ -792,9 +817,9 @@ #endif #ifdef PNG_pCAL_SUPPORTED png_uint_32 PNGAPI -png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_pCAL(png_const_structrp png_ptr, png_const_inforp info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams, png_charp *units, png_charpp *params) { png_debug1(1, "in %s retrieval function", "pCAL"); @@ -818,18 +843,22 @@ #endif #ifdef PNG_sCAL_SUPPORTED # ifdef PNG_FIXED_POINT_SUPPORTED -# ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED +# if (defined PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ + (defined PNG_FLOATING_POINT_SUPPORTED) png_uint_32 PNGAPI -png_get_sCAL_fixed(png_structp png_ptr, png_const_infop info_ptr, +png_get_sCAL_fixed(png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, png_fixed_point *width, png_fixed_point *height) { if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) { *unit = info_ptr->scal_unit; - /*TODO: make this work without FP support */ + /*TODO: make this work without FP support; the API is currently eliminated + * if neither floating point APIs nor internal floating point arithmetic + * are enabled. + */ *width = png_fixed(png_ptr, atof(info_ptr->scal_s_width), "sCAL width"); *height = png_fixed(png_ptr, atof(info_ptr->scal_s_height), "sCAL height"); return (PNG_INFO_sCAL); @@ -840,9 +869,9 @@ # endif /* FLOATING_ARITHMETIC */ # endif /* FIXED_POINT */ # ifdef PNG_FLOATING_POINT_SUPPORTED png_uint_32 PNGAPI -png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_sCAL(png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, double *width, double *height) { if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) @@ -856,9 +885,9 @@ return(0); } # endif /* FLOATING POINT */ png_uint_32 PNGAPI -png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_sCAL_s(png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, png_charpp width, png_charpp height) { if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) @@ -874,9 +903,9 @@ #endif /* sCAL */ #ifdef PNG_pHYs_SUPPORTED png_uint_32 PNGAPI -png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_pHYs(png_const_structrp png_ptr, png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type) { png_uint_32 retval = 0; @@ -908,9 +937,9 @@ } #endif /* pHYs */ png_uint_32 PNGAPI -png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_PLTE(png_const_structrp png_ptr, png_const_inforp info_ptr, png_colorp *palette, int *num_palette) { png_debug1(1, "in %s retrieval function", "PLTE"); @@ -927,9 +956,9 @@ } #ifdef PNG_sBIT_SUPPORTED png_uint_32 PNGAPI -png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr, +png_get_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, png_color_8p *sig_bit) { png_debug1(1, "in %s retrieval function", "sBIT"); @@ -945,9 +974,9 @@ #endif #ifdef PNG_TEXT_SUPPORTED png_uint_32 PNGAPI -png_get_text(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_text(png_const_structrp png_ptr, png_const_inforp info_ptr, png_textp *text_ptr, int *num_text) { if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0) { @@ -971,9 +1000,10 @@ #endif #ifdef PNG_tIME_SUPPORTED png_uint_32 PNGAPI -png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time) +png_get_tIME(png_const_structrp png_ptr, png_inforp info_ptr, + png_timep *mod_time) { png_debug1(1, "in %s retrieval function", "tIME"); if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME) @@ -988,9 +1018,9 @@ #endif #ifdef PNG_tRNS_SUPPORTED png_uint_32 PNGAPI -png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr, +png_get_tRNS(png_const_structrp png_ptr, png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color) { png_uint_32 retval = 0; if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) @@ -1031,11 +1061,11 @@ return (retval); } #endif -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED int PNGAPI -png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr, +png_get_unknown_chunks(png_const_structrp png_ptr, png_const_inforp info_ptr, png_unknown_chunkpp unknowns) { if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL) { @@ -1048,77 +1078,87 @@ #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED png_byte PNGAPI -png_get_rgb_to_gray_status (png_const_structp png_ptr) +png_get_rgb_to_gray_status (png_const_structrp png_ptr) { return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0); } #endif #ifdef PNG_USER_CHUNKS_SUPPORTED png_voidp PNGAPI -png_get_user_chunk_ptr(png_const_structp png_ptr) +png_get_user_chunk_ptr(png_const_structrp png_ptr) { return (png_ptr ? png_ptr->user_chunk_ptr : NULL); } #endif png_size_t PNGAPI -png_get_compression_buffer_size(png_const_structp png_ptr) +png_get_compression_buffer_size(png_const_structrp png_ptr) { - return (png_ptr ? png_ptr->zbuf_size : 0); + if (png_ptr == NULL) + return 0; + +# ifdef PNG_WRITE_SUPPORTED + if (png_ptr->mode & PNG_IS_READ_STRUCT) +# endif + { +# ifdef PNG_SEQUENTIAL_READ_SUPPORTED + return png_ptr->IDAT_read_size; +# else + return PNG_IDAT_READ_SIZE; +# endif + } + +# ifdef PNG_WRITE_SUPPORTED + else + return png_ptr->zbuffer_size; +# endif } #ifdef PNG_SET_USER_LIMITS_SUPPORTED /* These functions were added to libpng 1.2.6 and were enabled * by default in libpng-1.4.0 */ png_uint_32 PNGAPI -png_get_user_width_max (png_const_structp png_ptr) +png_get_user_width_max (png_const_structrp png_ptr) { return (png_ptr ? png_ptr->user_width_max : 0); } png_uint_32 PNGAPI -png_get_user_height_max (png_const_structp png_ptr) +png_get_user_height_max (png_const_structrp png_ptr) { return (png_ptr ? png_ptr->user_height_max : 0); } /* This function was added to libpng 1.4.0 */ png_uint_32 PNGAPI -png_get_chunk_cache_max (png_const_structp png_ptr) +png_get_chunk_cache_max (png_const_structrp png_ptr) { return (png_ptr ? png_ptr->user_chunk_cache_max : 0); } /* This function was added to libpng 1.4.1 */ png_alloc_size_t PNGAPI -png_get_chunk_malloc_max (png_const_structp png_ptr) +png_get_chunk_malloc_max (png_const_structrp png_ptr) { return (png_ptr ? png_ptr->user_chunk_malloc_max : 0); } #endif /* ?PNG_SET_USER_LIMITS_SUPPORTED */ /* These functions were added to libpng 1.4.0 */ #ifdef PNG_IO_STATE_SUPPORTED png_uint_32 PNGAPI -png_get_io_state (png_structp png_ptr) +png_get_io_state (png_const_structrp png_ptr) { return png_ptr->io_state; } png_uint_32 PNGAPI -png_get_io_chunk_type (png_const_structp png_ptr) +png_get_io_chunk_type (png_const_structrp png_ptr) { return png_ptr->chunk_name; } - -png_const_bytep PNGAPI -png_get_io_chunk_name (png_structp png_ptr) -{ - PNG_CSTRING_FROM_CHUNK(png_ptr->io_chunk_string, png_ptr->chunk_name); - return png_ptr->io_chunk_string; -} #endif /* ?PNG_IO_STATE_SUPPORTED */ #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/pnginfo.h libpng-1.6.0beta32/pnginfo.h --- libpng-1.5.13/pnginfo.h 2012-09-27 06:21:19.639592944 -0500 +++ libpng-1.6.0beta32/pnginfo.h 2012-11-25 12:40:10.013028315 -0600 @@ -54,9 +54,9 @@ #define PNGINFO_H struct png_info_def { - /* the following are necessary for every PNG file */ + /* The following are necessary for every PNG file */ png_uint_32 width; /* width of image in pixels (from IHDR) */ png_uint_32 height; /* height of image in pixels (from IHDR) */ png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ png_size_t rowbytes; /* bytes needed to hold an untransformed row */ @@ -69,32 +69,45 @@ png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ - /* The following is informational only on read, and not used on writes. */ + /* The following are set by png_set_IHDR, called from the application on + * write, but the are never actually used by the write code. + */ png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ png_byte pixel_depth; /* number of bits per pixel */ png_byte spare_byte; /* to align the data, and for future use */ + +#ifdef PNG_READ_SUPPORTED + /* This is never set during write */ png_byte signature[8]; /* magic bytes read by libpng from start of file */ +#endif /* The rest of the data is optional. If you are reading, check the * valid field to see if the information in these are valid. If you * are writing, set the valid field to those chunks you want written, * and initialize the appropriate fields below. */ -#if defined(PNG_gAMA_SUPPORTED) - /* The gAMA chunk describes the gamma characteristics of the system - * on which the image was created, normally in the range [1.0, 2.5]. - * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. - */ - png_fixed_point gamma; +#if defined PNG_COLORSPACE_SUPPORTED || defined PNG_GAMMA_SUPPORTED + /* png_colorspace only contains 'flags' if neither GAMMA or COLORSPACE are + * defined. When COLORSPACE is switched on all the colorspace-defining + * chunks should be enabled, when GAMMA is switched on all the gamma-defining + * chunks should be enabled. If this is not done it becomes possible to read + * inconsistent PNG files and assign a probably incorrect interpretation to + * the information. (In other words, by carefully choosing which chunks to + * recognize the system configuration can select an interpretation for PNG + * files containing ambiguous data and this will result in inconsistent + * behavior between different libpng builds!) + */ + png_colorspace colorspace; #endif -#ifdef PNG_sRGB_SUPPORTED - /* GR-P, 0.96a */ - /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ - png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ +#ifdef PNG_iCCP_SUPPORTED + /* iCCP chunk data. */ + png_charp iccp_name; /* profile name */ + png_bytep iccp_profile; /* International Color Consortium profile data */ + png_uint_32 iccp_proflen; /* ICC profile data length */ #endif #ifdef PNG_TEXT_SUPPORTED /* The tEXt, and zTXt chunks contain human-readable textual data in @@ -182,25 +195,8 @@ */ png_uint_16p hist; #endif -#ifdef PNG_cHRM_SUPPORTED - /* The cHRM chunk describes the CIE color characteristics of the monitor - * on which the PNG was created. This data allows the viewer to do gamut - * mapping of the input image to ensure that the viewer sees the same - * colors in the image as the creator. Values are in the range - * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. - */ - png_fixed_point x_white; - png_fixed_point y_white; - png_fixed_point x_red; - png_fixed_point y_red; - png_fixed_point x_green; - png_fixed_point y_green; - png_fixed_point x_blue; - png_fixed_point y_blue; -#endif - #ifdef PNG_pCAL_SUPPORTED /* The pCAL chunk describes a transformation between the stored pixel * values and original physical data values used to create the image. * The integer range [0, 2^bit_depth - 1] maps to the floating-point @@ -223,21 +219,12 @@ /* New members added in libpng-1.0.6 */ png_uint_32 free_me; /* flags items libpng is responsible for freeing */ -#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ - defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED /* Storage for unknown chunks that the library doesn't recognize. */ png_unknown_chunkp unknown_chunks; - int unknown_chunks_num; -#endif - -#ifdef PNG_iCCP_SUPPORTED - /* iCCP chunk data. */ - png_charp iccp_name; /* profile name */ - png_bytep iccp_profile; /* International Color Consortium profile data */ - png_uint_32 iccp_proflen; /* ICC profile data length */ - png_byte iccp_compression; /* Always zero */ + unsigned int unknown_chunks_num; #endif #ifdef PNG_sPLT_SUPPORTED /* Data on sPLT chunks (there may be more than one). */ diff -ru4NwbB libpng-1.5.13/pngmem.c libpng-1.6.0beta32/pngmem.c --- libpng-1.5.13/pngmem.c 2012-09-27 06:21:19.688430989 -0500 +++ libpng-1.6.0beta32/pngmem.c 2012-11-25 12:40:10.066349947 -0600 @@ -1,8 +1,8 @@ /* pngmem.c - stub functions for memory allocation * - * Last changed in libpng 1.5.13 [September 27, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -19,629 +19,177 @@ #include "pngpriv.h" #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) - -/* Borland DOS special memory handler */ -#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) -/* If you change this, be sure to change the one in png.h also */ - -/* Allocate memory for a png_struct. The malloc and memset can be replaced - by a single call to calloc() if this is thought to improve performance. */ -PNG_FUNCTION(png_voidp /* PRIVATE */, -png_create_struct,(int type),PNG_ALLOCATED) -{ -# ifdef PNG_USER_MEM_SUPPORTED - return (png_create_struct_2(type, NULL, NULL)); -} - -/* Alternate version of png_create_struct, for use with user-defined malloc. */ -PNG_FUNCTION(png_voidp /* PRIVATE */, -png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr), - PNG_ALLOCATED) -{ -# endif /* PNG_USER_MEM_SUPPORTED */ - png_size_t size; - png_voidp struct_ptr; - - if (type == PNG_STRUCT_INFO) - size = png_sizeof(png_info); - - else if (type == PNG_STRUCT_PNG) - size = png_sizeof(png_struct); - - else - return (png_get_copyright(NULL)); - -# ifdef PNG_USER_MEM_SUPPORTED - if (malloc_fn != NULL) - { - png_struct dummy_struct; - png_memset(&dummy_struct, 0, sizeof dummy_struct); - dummy_struct.mem_ptr=mem_ptr; - struct_ptr = (*(malloc_fn))(&dummy_struct, (png_alloc_size_t)size); - } - - else -# endif /* PNG_USER_MEM_SUPPORTED */ - struct_ptr = (png_voidp)farmalloc(size); - if (struct_ptr != NULL) - png_memset(struct_ptr, 0, size); - - return (struct_ptr); -} - -/* Free memory allocated by a png_create_struct() call */ +/* Free a png_struct */ void /* PRIVATE */ -png_destroy_struct(png_voidp struct_ptr) +png_destroy_png_struct(png_structrp png_ptr) { -# ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2(struct_ptr, NULL, NULL); -} - -/* Free memory allocated by a png_create_struct() call */ -void /* PRIVATE */ -png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, - png_voidp mem_ptr) + if (png_ptr != NULL) { + /* png_free might call png_error and may certainly call + * png_get_mem_ptr, so fake a temporary png_struct to support this. + */ + png_struct dummy_struct = *png_ptr; + memset(png_ptr, 0, (sizeof *png_ptr)); + png_free(&dummy_struct, png_ptr); + +# ifdef PNG_SETJMP_SUPPORTED + /* We may have a jmp_buf left to deallocate. */ + png_free_jmpbuf(&dummy_struct); # endif - if (struct_ptr != NULL) - { -# ifdef PNG_USER_MEM_SUPPORTED - if (free_fn != NULL) - { - png_struct dummy_struct; - png_memset(&dummy_struct, 0, sizeof dummy_struct); - dummy_struct.mem_ptr=mem_ptr; - (*(free_fn))(&dummy_struct, struct_ptr); - return; - } - -# endif /* PNG_USER_MEM_SUPPORTED */ - farfree (struct_ptr); } } /* Allocate memory. For reasonable files, size should never exceed * 64K. However, zlib may allocate more then 64K if you don't tell * it not to. See zconf.h and png.h for more information. zlib does * need to allocate exactly 64K, so whatever you call here must * have the ability to do that. - * - * Borland seems to have a problem in DOS mode for exactly 64K. - * It gives you a segment with an offset of 8 (perhaps to store its - * memory stuff). zlib doesn't like this at all, so we have to - * detect and deal with it. This code should not be needed in - * Windows or OS/2 modes, and only in 16 bit mode. This code has - * been updated by Alexander Lehmann for version 0.89 to waste less - * memory. - * - * Note that we can't use png_size_t for the "size" declaration, - * since on some systems a png_size_t is a 16-bit quantity, and as a - * result, we would be truncating potentially larger memory requests - * (which should cause a fatal error) and introducing major problems. */ PNG_FUNCTION(png_voidp,PNGAPI -png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +png_calloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) { png_voidp ret; - ret = (png_malloc(png_ptr, size)); + ret = png_malloc(png_ptr, size); if (ret != NULL) - png_memset(ret,0,(png_size_t)size); + memset(ret, 0, size); - return (ret); + return ret; } -PNG_FUNCTION(png_voidp,PNGAPI -png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +/* png_malloc_base, an internal function added at libpng 1.6.0, does the work of + * allocating memory, taking into account limits and PNG_USER_MEM_SUPPORTED. + * Checking and error handling must happen outside this routine; it returns NULL + * if the allocation cannot be done (for any reason.) + */ +PNG_FUNCTION(png_voidp /* PRIVATE */, +png_malloc_base,(png_const_structrp png_ptr, png_alloc_size_t size), + PNG_ALLOCATED) { - png_voidp ret; - - if (png_ptr == NULL || size == 0) - return (NULL); - + /* Moved to png_malloc_base from png_malloc_default in 1.6.0; the DOS + * allocators have also been removed in 1.6.0, so any 16-bit system now has + * to implement a user memory handler. This checks to be sure it isn't + * called with big numbers. + */ # ifdef PNG_USER_MEM_SUPPORTED - if (png_ptr->malloc_fn != NULL) - ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size)); - - else - ret = (png_malloc_default(png_ptr, size)); - - if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of memory"); - - return (ret); -} - -PNG_FUNCTION(png_voidp,PNGAPI -png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) -{ - png_voidp ret; -# endif /* PNG_USER_MEM_SUPPORTED */ - - if (png_ptr == NULL || size == 0) - return (NULL); - -# ifdef PNG_MAX_MALLOC_64K - if (size > (png_uint_32)65536L) - { - png_warning(png_ptr, "Cannot Allocate > 64K"); - ret = NULL; - } - - else + PNG_UNUSED(png_ptr) # endif - - if (size != (size_t)size) - ret = NULL; - - else if (size == (png_uint_32)65536L) - { - if (png_ptr->offset_table == NULL) - { - /* Try to see if we need to do any of this fancy stuff */ - ret = farmalloc(size); - if (ret == NULL || ((png_size_t)ret & 0xffff)) - { - int num_blocks; - png_uint_32 total_size; - png_bytep table; - int i, mem_level, window_bits; - png_byte huge * hptr; - int window_bits - - if (ret != NULL) - { - farfree(ret); - ret = NULL; - } - - window_bits = - png_ptr->zlib_window_bits >= png_ptr->zlib_text_window_bits ? - png_ptr->zlib_window_bits : png_ptr->zlib_text_window_bits; - - if (window_bits > 14) - num_blocks = (int)(1 << (window_bits - 14)); - - else - num_blocks = 1; - - mem_level = - png_ptr->zlib_mem_level >= png_ptr->zlib_text_mem_level ? - png_ptr->zlib_mem_level : png_ptr->zlib_text_mem_level; - - if (mem_level >= 7) - num_blocks += (int)(1 << (mem_level - 7)); - - else - num_blocks++; - - total_size = ((png_uint_32)65536L) * (png_uint_32)num_blocks+16; - - table = farmalloc(total_size); - - if (table == NULL) - { -# ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out Of Memory"); /* Note "O", "M" */ - - else - png_warning(png_ptr, "Out Of Memory"); -# endif - return (NULL); - } - - if ((png_size_t)table & 0xfff0) - { -# ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, - "Farmalloc didn't return normalized pointer"); - - else - png_warning(png_ptr, - "Farmalloc didn't return normalized pointer"); -# endif - return (NULL); - } - - png_ptr->offset_table = table; - png_ptr->offset_table_ptr = farmalloc(num_blocks * - png_sizeof(png_bytep)); - - if (png_ptr->offset_table_ptr == NULL) - { -# ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out Of memory"); /* Note "O", "m" */ - - else - png_warning(png_ptr, "Out Of memory"); + if (size > 0 && size <= ~(size_t)0 +# ifdef PNG_MAX_MALLOC_64K + && size <= 65536U # endif - return (NULL); - } - - hptr = (png_byte huge *)table; - if ((png_size_t)hptr & 0xf) + ) { - hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L); - hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */ - } - - for (i = 0; i < num_blocks; i++) - { - png_ptr->offset_table_ptr[i] = (png_bytep)hptr; - hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */ - } - - png_ptr->offset_table_number = num_blocks; - png_ptr->offset_table_count = 0; - png_ptr->offset_table_count_free = 0; - } - } - - if (png_ptr->offset_table_count >= png_ptr->offset_table_number) - { -# ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of Memory"); /* Note "O" and "M" */ +#ifdef PNG_USER_MEM_SUPPORTED + if (png_ptr != NULL && png_ptr->malloc_fn != NULL) + return png_ptr->malloc_fn(png_constcast(png_structrp,png_ptr), size); else - png_warning(png_ptr, "Out of Memory"); # endif - return (NULL); + return malloc((size_t)size); /* checked for truncation above */ } - ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++]; - } - - else - ret = farmalloc(size); - -# ifndef PNG_USER_MEM_SUPPORTED - if (ret == NULL) - { - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of memory"); /* Note "o" and "m" */ - else - png_warning(png_ptr, "Out of memory"); /* Note "o" and "m" */ - } -# endif - - return (ret); + return NULL; } -/* Free a pointer allocated by png_malloc(). In the default - * configuration, png_ptr is not used, but is passed in case it - * is needed. If ptr is NULL, return without taking any action. +/* Various functions that have different error handling are derived from this. + * png_malloc always exists, but if PNG_USER_MEM_SUPPORTED is defined a separate + * function png_malloc_default is also provided. */ -void PNGAPI -png_free(png_structp png_ptr, png_voidp ptr) -{ - if (png_ptr == NULL || ptr == NULL) - return; - -# ifdef PNG_USER_MEM_SUPPORTED - if (png_ptr->free_fn != NULL) - { - (*(png_ptr->free_fn))(png_ptr, ptr); - return; - } - - else - png_free_default(png_ptr, ptr); -} - -void PNGAPI -png_free_default(png_structp png_ptr, png_voidp ptr) +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc,(png_const_structrp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) { -# endif /* PNG_USER_MEM_SUPPORTED */ - - if (png_ptr == NULL || ptr == NULL) - return; + png_voidp ret; - if (png_ptr->offset_table != NULL) - { - int i; + if (png_ptr == NULL) + return NULL; - for (i = 0; i < png_ptr->offset_table_count; i++) - { - if (ptr == png_ptr->offset_table_ptr[i]) - { - ptr = NULL; - png_ptr->offset_table_count_free++; - break; - } - } - if (png_ptr->offset_table_count_free == png_ptr->offset_table_count) - { - farfree(png_ptr->offset_table); - farfree(png_ptr->offset_table_ptr); - png_ptr->offset_table = NULL; - png_ptr->offset_table_ptr = NULL; - } - } + ret = png_malloc_base(png_ptr, size); - if (ptr != NULL) - farfree(ptr); -} - -#else /* Not the Borland DOS special memory handler */ + if (ret == NULL) + png_error(png_ptr, "Out of memory"); /* 'm' means png_malloc */ -/* Allocate memory for a png_struct or a png_info. The malloc and - memset can be replaced by a single call to calloc() if this is thought - to improve performance noticably. */ -PNG_FUNCTION(png_voidp /* PRIVATE */, -png_create_struct,(int type),PNG_ALLOCATED) -{ -# ifdef PNG_USER_MEM_SUPPORTED - return (png_create_struct_2(type, NULL, NULL)); + return ret; } -/* Allocate memory for a png_struct or a png_info. The malloc and - memset can be replaced by a single call to calloc() if this is thought - to improve performance noticably. */ -PNG_FUNCTION(png_voidp /* PRIVATE */, -png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr), - PNG_ALLOCATED) -{ -# endif /* PNG_USER_MEM_SUPPORTED */ - png_size_t size; - png_voidp struct_ptr; - - if (type == PNG_STRUCT_INFO) - size = png_sizeof(png_info); - - else if (type == PNG_STRUCT_PNG) - size = png_sizeof(png_struct); - - else - return (NULL); - # ifdef PNG_USER_MEM_SUPPORTED - if (malloc_fn != NULL) +PNG_FUNCTION(png_voidp,PNGAPI +png_malloc_default,(png_const_structrp png_ptr, png_alloc_size_t size), + PNG_ALLOCATED PNG_DEPRECATED) { - png_struct dummy_struct; - png_structp png_ptr = &dummy_struct; - png_ptr->mem_ptr=mem_ptr; - struct_ptr = (*(malloc_fn))(png_ptr, size); - - if (struct_ptr != NULL) - png_memset(struct_ptr, 0, size); - - return (struct_ptr); - } -# endif /* PNG_USER_MEM_SUPPORTED */ - -# if defined(__TURBOC__) && !defined(__FLAT__) - struct_ptr = (png_voidp)farmalloc(size); -# else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - struct_ptr = (png_voidp)halloc(size, 1); -# else - struct_ptr = (png_voidp)malloc(size); -# endif -# endif - - if (struct_ptr != NULL) - png_memset(struct_ptr, 0, size); + png_voidp ret; - return (struct_ptr); -} + if (png_ptr == NULL) + return NULL; + /* Passing 'NULL' here bypasses the application provided memory handler. */ + ret = png_malloc_base(NULL/*use malloc*/, size); -/* Free memory allocated by a png_create_struct() call */ -void /* PRIVATE */ -png_destroy_struct(png_voidp struct_ptr) -{ -# ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2(struct_ptr, NULL, NULL); -} + if (ret == NULL) + png_error(png_ptr, "Out of Memory"); /* 'M' means png_malloc_default */ -/* Free memory allocated by a png_create_struct() call */ -void /* PRIVATE */ -png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn, - png_voidp mem_ptr) -{ -# endif /* PNG_USER_MEM_SUPPORTED */ - if (struct_ptr != NULL) - { -# ifdef PNG_USER_MEM_SUPPORTED - if (free_fn != NULL) - { - png_struct dummy_struct; - png_structp png_ptr = &dummy_struct; - png_ptr->mem_ptr=mem_ptr; - (*(free_fn))(png_ptr, struct_ptr); - return; + return ret; } # endif /* PNG_USER_MEM_SUPPORTED */ -# if defined(__TURBOC__) && !defined(__FLAT__) - farfree(struct_ptr); - -# else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - hfree(struct_ptr); - -# else - free(struct_ptr); -# endif -# endif - } -} - -/* Allocate memory. For reasonable files, size should never exceed - * 64K. However, zlib may allocate more then 64K if you don't tell - * it not to. See zconf.h and png.h for more information. zlib does - * need to allocate exactly 64K, so whatever you call here must - * have the ability to do that. +/* This function was added at libpng version 1.2.3. The png_malloc_warn() + * function will issue a png_warning and return NULL instead of issuing a + * png_error, if it fails to allocate the requested memory. */ - PNG_FUNCTION(png_voidp,PNGAPI -png_calloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) +png_malloc_warn,(png_const_structrp png_ptr, png_alloc_size_t size), + PNG_ALLOCATED) { - png_voidp ret; - - ret = (png_malloc(png_ptr, size)); - - if (ret != NULL) - png_memset(ret,0,(png_size_t)size); - - return (ret); -} - -PNG_FUNCTION(png_voidp,PNGAPI -png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) + if (png_ptr != NULL) { - png_voidp ret; - -# ifdef PNG_USER_MEM_SUPPORTED - if (png_ptr == NULL || size == 0) - return (NULL); - - if (png_ptr->malloc_fn != NULL) - ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size)); + png_voidp ret = png_malloc_base(png_ptr, size); - else - ret = (png_malloc_default(png_ptr, size)); - - if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of Memory"); + if (ret != NULL) + return ret; - return (ret); + png_warning(png_ptr, "Out of memory"); } -PNG_FUNCTION(png_voidp,PNGAPI -png_malloc_default,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) -{ - png_voidp ret; -# endif /* PNG_USER_MEM_SUPPORTED */ - - if (png_ptr == NULL || size == 0) - return (NULL); - -# ifdef PNG_MAX_MALLOC_64K - if (size > (png_uint_32)65536L) - { -# ifndef PNG_USER_MEM_SUPPORTED - if ((png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Cannot Allocate > 64K"); - - else -# endif return NULL; } -# endif - - /* Check for overflow */ -# if defined(__TURBOC__) && !defined(__FLAT__) - - if (size != (unsigned long)size) - ret = NULL; - - else - ret = farmalloc(size); - -# else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - if (size != (unsigned long)size) - ret = NULL; - - else - ret = halloc(size, 1); - -# else - if (size != (size_t)size) - ret = NULL; - - else - ret = malloc((size_t)size); -# endif -# endif - -# ifndef PNG_USER_MEM_SUPPORTED - if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0) - png_error(png_ptr, "Out of Memory"); -# endif - - return (ret); -} /* Free a pointer allocated by png_malloc(). If ptr is NULL, return * without taking any action. */ void PNGAPI -png_free(png_structp png_ptr, png_voidp ptr) +png_free(png_const_structrp png_ptr, png_voidp ptr) { if (png_ptr == NULL || ptr == NULL) return; # ifdef PNG_USER_MEM_SUPPORTED if (png_ptr->free_fn != NULL) - { - (*(png_ptr->free_fn))(png_ptr, ptr); - return; - } + png_ptr->free_fn(png_constcast(png_structrp,png_ptr), ptr); else png_free_default(png_ptr, ptr); } -void PNGAPI -png_free_default(png_structp png_ptr, png_voidp ptr) +PNG_FUNCTION(void,PNGAPI +png_free_default,(png_const_structrp png_ptr, png_voidp ptr),PNG_DEPRECATED) { if (png_ptr == NULL || ptr == NULL) return; - # endif /* PNG_USER_MEM_SUPPORTED */ -# if defined(__TURBOC__) && !defined(__FLAT__) - farfree(ptr); - -# else -# if defined(_MSC_VER) && defined(MAXSEG_64K) - hfree(ptr); - -# else free(ptr); - -# endif -# endif } -#endif /* Not Borland DOS special memory handler */ - -/* This function was added at libpng version 1.2.3. The png_malloc_warn() - * function will set up png_malloc() to issue a png_warning and return NULL - * instead of issuing a png_error, if it fails to allocate the requested - * memory. - */ -PNG_FUNCTION(png_voidp,PNGAPI -png_malloc_warn,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED) -{ - png_voidp ptr; - png_uint_32 save_flags; - if (png_ptr == NULL) - return (NULL); - - save_flags = png_ptr->flags; - png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK; - ptr = (png_voidp)png_malloc((png_structp)png_ptr, size); - png_ptr->flags=save_flags; - return(ptr); -} - #ifdef PNG_USER_MEM_SUPPORTED /* This function is called when the application wants to use another method * of allocating and freeing memory. */ void PNGAPI -png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr +png_set_mem_fn(png_structrp png_ptr, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn) { if (png_ptr != NULL) { @@ -655,13 +203,13 @@ * functions. The application should free any memory associated with this * pointer before png_write_destroy and png_read_destroy are called. */ png_voidp PNGAPI -png_get_mem_ptr(png_const_structp png_ptr) +png_get_mem_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) - return (NULL); + return NULL; - return ((png_voidp)png_ptr->mem_ptr); + return png_ptr->mem_ptr; } #endif /* PNG_USER_MEM_SUPPORTED */ #endif /* PNG_READ_SUPPORTED || PNG_WRITE_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/pngpread.c libpng-1.6.0beta32/pngpread.c --- libpng-1.5.13/pngpread.c 2012-09-27 06:21:19.697127503 -0500 +++ libpng-1.6.0beta32/pngpread.c 2012-11-25 12:40:10.075010678 -0600 @@ -1,8 +1,8 @@ /* pngpread.c - read a png file in push mode * - * Last changed in libpng 1.5.11 [June 14, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -26,9 +26,9 @@ #define PNG_READ_iTXt_MODE 7 #define PNG_ERROR_MODE 8 void PNGAPI -png_process_data(png_structp png_ptr, png_infop info_ptr, +png_process_data(png_structrp png_ptr, png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size) { if (png_ptr == NULL || info_ptr == NULL) return; @@ -41,9 +41,9 @@ } } png_size_t PNGAPI -png_process_data_pause(png_structp png_ptr, int save) +png_process_data_pause(png_structrp png_ptr, int save) { if (png_ptr != NULL) { /* It's easiest for the caller if we do the save, then the caller doesn't @@ -68,9 +68,9 @@ return 0; } png_uint_32 PNGAPI -png_process_data_skip(png_structp png_ptr) +png_process_data_skip(png_structrp png_ptr) { png_uint_32 remaining = 0; if (png_ptr != NULL && png_ptr->process_mode == PNG_SKIP_MODE && @@ -102,9 +102,9 @@ /* What we do with the incoming data depends on what we were previously * doing before we ran out of data... */ void /* PRIVATE */ -png_process_some_data(png_structp png_ptr, png_infop info_ptr) +png_process_some_data(png_structrp png_ptr, png_inforp info_ptr) { if (png_ptr == NULL) return; @@ -148,9 +148,9 @@ * checked by the calling application, or because of multiple calls to this * routine. */ void /* PRIVATE */ -png_push_read_sig(png_structp png_ptr, png_infop info_ptr) +png_push_read_sig(png_structrp png_ptr, png_inforp info_ptr) { png_size_t num_checked = png_ptr->sig_bytes, num_to_check = 8 - num_checked; @@ -182,11 +181,14 @@ } } void /* PRIVATE */ -png_push_read_chunk(png_structp png_ptr, png_infop info_ptr) +png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr) { png_uint_32 chunk_name; +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + int keep; /* unknown handling method */ +#endif /* First we make sure we have enough data for the 4 byte chunk name * and the 4 byte chunk length before proceeding with decoding the * chunk data. To fully decode each of these chunks, we also make @@ -216,16 +218,30 @@ chunk_name = png_ptr->chunk_name; if (chunk_name == png_IDAT) { - /* This is here above the if/else case statement below because if the - * unknown handling marks 'IDAT' as unknown then the IDAT handling case is - * completely skipped. - * - * TODO: there must be a better way of doing this. - */ if (png_ptr->mode & PNG_AFTER_IDAT) png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; + + /* If we reach an IDAT chunk, this means we have read all of the + * header chunks, and we can start reading the image (or if this + * is called after the image has been read - we have an error). + */ + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_error(png_ptr, "Missing IHDR before IDAT"); + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_error(png_ptr, "Missing PLTE before IDAT"); + + png_ptr->mode |= PNG_HAVE_IDAT; + + if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) + if (png_ptr->push_length == 0) + return; + + if (png_ptr->mode & PNG_AFTER_IDAT) + png_benign_error(png_ptr, "Too many IDATs found"); } if (chunk_name == png_IHDR) { @@ -255,36 +271,23 @@ png_push_have_end(png_ptr, info_ptr); } #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_chunk_unknown_handling(png_ptr, chunk_name)) + else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { png_push_save_buffer(png_ptr); return; } - if (chunk_name == png_IDAT) - png_ptr->mode |= PNG_HAVE_IDAT; - - png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); + png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length, keep); if (chunk_name == png_PLTE) png_ptr->mode |= PNG_HAVE_PLTE; - - else if (chunk_name == png_IDAT) - { - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before IDAT"); - - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - png_error(png_ptr, "Missing PLTE before IDAT"); - } } -#endif +#endif else if (chunk_name == png_PLTE) { if (png_ptr->push_length + 4 > png_ptr->buffer_size) { @@ -295,32 +298,9 @@ } else if (chunk_name == png_IDAT) { - /* If we reach an IDAT chunk, this means we have read all of the - * header chunks, and we can start reading the image (or if this - * is called after the image has been read - we have an error). - */ - - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before IDAT"); - - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - png_error(png_ptr, "Missing PLTE before IDAT"); - - if (png_ptr->mode & PNG_HAVE_IDAT) - { - if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) - if (png_ptr->push_length == 0) - return; - - if (png_ptr->mode & PNG_AFTER_IDAT) - png_benign_error(png_ptr, "Too many IDATs found"); - } - png_ptr->idat_size = png_ptr->push_length; - png_ptr->mode |= PNG_HAVE_IDAT; png_ptr->process_mode = PNG_READ_IDAT_MODE; png_push_have_info(png_ptr, info_ptr); png_ptr->zstream.avail_out = (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, @@ -557,23 +536,24 @@ { png_push_save_buffer(png_ptr); return; } - png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length); + png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length, + PNG_HANDLE_CHUNK_AS_DEFAULT); } png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; } void /* PRIVATE */ -png_push_crc_skip(png_structp png_ptr, png_uint_32 skip) +png_push_crc_skip(png_structrp png_ptr, png_uint_32 skip) { png_ptr->process_mode = PNG_SKIP_MODE; png_ptr->skip_length = skip; } void /* PRIVATE */ -png_push_crc_finish(png_structp png_ptr) +png_push_crc_finish(png_structrp png_ptr) { if (png_ptr->skip_length && png_ptr->save_buffer_size) { png_size_t save_size = png_ptr->save_buffer_size; @@ -653,9 +630,9 @@ else save_size = png_ptr->save_buffer_size; - png_memcpy(ptr, png_ptr->save_buffer_ptr, save_size); + memcpy(ptr, png_ptr->save_buffer_ptr, save_size); length -= save_size; ptr += save_size; png_ptr->buffer_size -= save_size; png_ptr->save_buffer_size -= save_size; @@ -671,17 +647,17 @@ else save_size = png_ptr->current_buffer_size; - png_memcpy(ptr, png_ptr->current_buffer_ptr, save_size); + memcpy(ptr, png_ptr->current_buffer_ptr, save_size); png_ptr->buffer_size -= save_size; png_ptr->current_buffer_size -= save_size; png_ptr->current_buffer_ptr += save_size; } } void /* PRIVATE */ -png_push_save_buffer(png_structp png_ptr) +png_push_save_buffer(png_structrp png_ptr) { if (png_ptr->save_buffer_size) { if (png_ptr->save_buffer_ptr != png_ptr->save_buffer) @@ -713,24 +687,24 @@ } new_max = png_ptr->save_buffer_size + png_ptr->current_buffer_size + 256; old_buffer = png_ptr->save_buffer; - png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr, new_max); + png_ptr->save_buffer = (png_bytep)png_malloc_warn(png_ptr, + (png_size_t)new_max); if (png_ptr->save_buffer == NULL) { png_free(png_ptr, old_buffer); png_error(png_ptr, "Insufficient memory for save_buffer"); } - png_memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); + memcpy(png_ptr->save_buffer, old_buffer, png_ptr->save_buffer_size); png_free(png_ptr, old_buffer); png_ptr->save_buffer_max = new_max; } - if (png_ptr->current_buffer_size) { - png_memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, + memcpy(png_ptr->save_buffer + png_ptr->save_buffer_size, png_ptr->current_buffer_ptr, png_ptr->current_buffer_size); png_ptr->save_buffer_size += png_ptr->current_buffer_size; png_ptr->current_buffer_size = 0; } @@ -739,9 +712,9 @@ png_ptr->buffer_size = 0; } void /* PRIVATE */ -png_push_restore_buffer(png_structp png_ptr, png_bytep buffer, +png_push_restore_buffer(png_structrp png_ptr, png_bytep buffer, png_size_t buffer_length) { png_ptr->current_buffer = buffer; png_ptr->current_buffer_size = buffer_length; @@ -749,9 +722,9 @@ png_ptr->current_buffer_ptr = png_ptr->current_buffer; } void /* PRIVATE */ -png_push_read_IDAT(png_structp png_ptr) +png_push_read_IDAT(png_structrp png_ptr) { if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER)) { png_byte chunk_length[4]; @@ -774,9 +747,9 @@ if (png_ptr->chunk_name != png_IDAT) { png_ptr->process_mode = PNG_READ_CHUNK_MODE; - if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) + if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) png_error(png_ptr, "Not enough compressed data"); return; } @@ -847,13 +819,14 @@ png_crc_finish(png_ptr, 0); png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER; png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->zowner = 0; } } void /* PRIVATE */ -png_process_IDAT_data(png_structp png_ptr, png_bytep buffer, +png_process_IDAT_data(png_structrp png_ptr, png_bytep buffer, png_size_t buffer_length) { /* The caller checks for a non-zero buffer length. */ if (!(buffer_length > 0) || buffer == NULL) @@ -863,15 +836,16 @@ * before returning, calling the row callback as required to * handle the uncompressed results. */ png_ptr->zstream.next_in = buffer; + /* TODO: WARNING: TRUNCATION ERROR: DANGER WILL ROBINSON: */ png_ptr->zstream.avail_in = (uInt)buffer_length; /* Keep going until the decompressed data is all processed * or the stream marked as finished. */ while (png_ptr->zstream.avail_in > 0 && - !(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) + !(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) { int ret; /* We have data for zlib, but we must check that zlib @@ -880,11 +854,11 @@ * data is just the LZ end code. */ if (!(png_ptr->zstream.avail_out > 0)) { - png_ptr->zstream.avail_out = - (uInt) PNG_ROWBYTES(png_ptr->pixel_depth, - png_ptr->iwidth) + 1; + /* TODO: WARNING: TRUNCATION ERROR: DANGER WILL ROBINSON: */ + png_ptr->zstream.avail_out = (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth, + png_ptr->iwidth) + 1); png_ptr->zstream.next_out = png_ptr->row_buf; } @@ -900,9 +874,10 @@ /* Check for any failure before proceeding. */ if (ret != Z_OK && ret != Z_STREAM_END) { /* Terminate the decompression. */ - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + png_ptr->zowner = 0; /* This may be a truncated stream (missing or * damaged end code). Treat that as a warning. */ @@ -928,9 +903,10 @@ png_ptr->pass > 6) { /* Extra data. */ png_warning(png_ptr, "Extra compressed data in IDAT"); - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + png_ptr->zowner = 0; /* Do no more processing; skip the unprocessed * input check below. */ @@ -943,9 +919,9 @@ } /* And check for the end of the stream. */ if (ret == Z_STREAM_END) - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; } /* All the data should have been processed, if anything * is left at this point we have bytes of IDAT data @@ -955,9 +931,9 @@ png_warning(png_ptr, "Extra compression data in IDAT"); } void /* PRIVATE */ -png_push_process_row(png_structp png_ptr) +png_push_process_row(png_structrp png_ptr) { /* 1.5.6: row_info moved out of png_struct to a local here. */ png_row_info row_info; @@ -981,9 +957,9 @@ * 1.5.6, while the buffer really is this big in current versions of libpng * it may not be in the future, so this was changed just to copy the * interlaced row count: */ - png_memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1); + memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1); #ifdef PNG_READ_TRANSFORMS_SUPPORTED if (png_ptr->transformations) png_do_read_transformations(png_ptr, &row_info); @@ -1184,28 +1160,28 @@ } } void /* PRIVATE */ -png_read_push_finish_row(png_structp png_ptr) +png_read_push_finish_row(png_structrp png_ptr) { #ifdef PNG_READ_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ /* Start of interlace block */ - static PNG_CONST png_byte FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; + static PNG_CONST png_byte png_pass_start[] = {0, 4, 0, 2, 0, 1, 0}; /* Offset to next interlace block */ - static PNG_CONST png_byte FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1}; /* Start of interlace block in the y direction */ - static PNG_CONST png_byte FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; + static PNG_CONST png_byte png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1}; /* Offset to next interlace block in the y direction */ - static PNG_CONST png_byte FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; + static PNG_CONST png_byte png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2}; /* Height of interlace block. This is not currently used - if you need * it, uncomment it here and in png.h - static PNG_CONST png_byte FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; + static PNG_CONST png_byte png_pass_height[] = {8, 8, 4, 4, 2, 2, 1}; */ #endif png_ptr->row_number++; @@ -1215,9 +1191,9 @@ #ifdef PNG_READ_INTERLACING_SUPPORTED if (png_ptr->interlaced) { png_ptr->row_number = 0; - png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); + memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); do { png_ptr->pass++; @@ -1250,32 +1226,32 @@ #endif /* PNG_READ_INTERLACING_SUPPORTED */ } void /* PRIVATE */ -png_push_have_info(png_structp png_ptr, png_infop info_ptr) +png_push_have_info(png_structrp png_ptr, png_inforp info_ptr) { if (png_ptr->info_fn != NULL) (*(png_ptr->info_fn))(png_ptr, info_ptr); } void /* PRIVATE */ -png_push_have_end(png_structp png_ptr, png_infop info_ptr) +png_push_have_end(png_structrp png_ptr, png_inforp info_ptr) { if (png_ptr->end_fn != NULL) (*(png_ptr->end_fn))(png_ptr, info_ptr); } void /* PRIVATE */ -png_push_have_row(png_structp png_ptr, png_bytep row) +png_push_have_row(png_structrp png_ptr, png_bytep row) { if (png_ptr->row_fn != NULL) (*(png_ptr->row_fn))(png_ptr, row, png_ptr->row_number, (int)png_ptr->pass); } #ifdef PNG_READ_INTERLACING_SUPPORTED void PNGAPI -png_progressive_combine_row (png_structp png_ptr, png_bytep old_row, +png_progressive_combine_row(png_const_structrp png_ptr, png_bytep old_row, png_const_bytep new_row) { if (png_ptr == NULL) return; @@ -1289,9 +1265,9 @@ } #endif /* PNG_READ_INTERLACING_SUPPORTED */ void PNGAPI -png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr, +png_set_progressive_read_fn(png_structrp png_ptr, png_voidp progressive_ptr, png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn) { if (png_ptr == NULL) @@ -1304,9 +1280,9 @@ png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer); } png_voidp PNGAPI -png_get_progressive_ptr(png_const_structp png_ptr) +png_get_progressive_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return (NULL); diff -ru4NwbB libpng-1.5.13/pngpriv.h libpng-1.6.0beta32/pngpriv.h --- libpng-1.5.13/pngpriv.h 2012-09-27 06:21:19.627288951 -0500 +++ libpng-1.6.0beta32/pngpriv.h 2012-11-25 12:40:09.999430956 -0600 @@ -5,17 +5,17 @@ * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * - * Last changed in libpng 1.5.10 [March 29, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h */ /* The symbols declared in this file (including the functions declared - * as PNG_EXTERN) are PRIVATE. They are not part of the libpng public + * as extern) are PRIVATE. They are not part of the libpng public * interface, and are not recommended for use by regular applications. * Some of them may become public in the future; others may stay private, * change in an incompatible way, or even disappear. * Although the libpng users are not forbidden to include this header, @@ -38,18 +38,44 @@ * still required (as of 2011-05-02.) */ #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ -/* This is required for the definition of abort(), used as a last ditch - * error handler when all else fails. - */ +/* Standard library headers not required by png.h: */ #include - -/* This is used to find 'offsetof', used below for alignment tests. */ -#include +#include #define PNGLIB_BUILD /*libpng is being built, not used*/ +/* If HAVE_CONFIG_H is defined during the build then the build system must + * provide an appropriate "config.h" file on the include path. The header file + * must provide definitions as required below (search for "HAVE_CONFIG_H"); + * see configure.ac for more details of the requirements. The macro + * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on + * 'configure'; define this macro to prevent the configure build including the + * configure generated config.h. Libpng is expected to compile without *any* + * special build system support on a reasonably ANSI-C compliant system. + */ +#if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H) +# include + + /* Pick up the definition of 'restrict' from config.h if it was read: */ +# define PNG_RESTRICT restrict +#endif + +/* To support symbol prefixing it is necessary to know *before* including png.h + * whether the fixed point (and maybe other) APIs are exported, because if they + * are not internal definitions may be required. This is handled below just + * before png.h is included, but load the configuration now if it is available. + */ +#ifndef PNGLCONF_H +# include "pnglibconf.h" +#endif + +/* Local renames may change non-exported API functions from png.h */ +#if defined PNG_PREFIX && !defined PNGPREFIX_H +# include "pngprefix.h" +#endif + #ifdef PNG_USER_CONFIG # include "pngusr.h" /* These should have been defined in pngusr.h */ # ifndef PNG_USER_PRIVATEBUILD @@ -123,11 +149,51 @@ #ifndef PNG_PRIVATE # define PNG_PRIVATE #endif +/* Symbol preprocessing support. + * + * To enable listing global, but internal, symbols the following macros should + * always be used to declare an extern data or function object in this file. + */ +#ifndef PNG_INTERNAL_DATA +# define PNG_INTERNAL_DATA(type, name, array) extern type name array +#endif + +#ifndef PNG_INTERNAL_FUNCTION +# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ + extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) +#endif + +/* If floating or fixed point APIs are disabled they may still be compiled + * internally. To handle this make sure they are declared as the appropriate + * internal extern function (otherwise the symbol prefixing stuff won't work and + * the functions will be used without definitions.) + * + * NOTE: although all the API functions are declared here they are not all + * actually built! Because the declarations are still made it is necessary to + * fake out types that they depend on. + */ +#ifndef PNG_FP_EXPORT +# ifndef PNG_FLOATING_POINT_SUPPORTED +# define PNG_FP_EXPORT(ordinal, type, name, args)\ + PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); + typedef struct png_incomplete png_double; + typedef png_double* png_doublep; + typedef const png_double* png_const_doublep; + typedef png_double** png_doublepp; +# endif +#endif +#ifndef PNG_FIXED_EXPORT +# ifndef PNG_FIXED_POINT_SUPPORTED +# define PNG_FIXED_EXPORT(ordinal, type, name, args)\ + PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); +# endif +#endif + #include "png.h" -#include "pnginfo.h" #include "pngstruct.h" +#include "pnginfo.h" /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ #ifndef PNG_DLL_EXPORT # define PNG_DLL_EXPORT @@ -172,25 +237,12 @@ # define PNG_USER_CHUNK_MALLOC_MAX 0 # endif #endif -/* This is used for 16 bit gamma tables - only the top level pointers are const, - * this could be changed: +/* This is used for 16 bit gamma tables -- only the top level pointers are + * const; this could be changed: */ -typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; - -/* Added at libpng-1.2.9 */ -/* Moved to pngpriv.h at libpng-1.5.0 */ - -/* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure" - * script. We may need it here to get the correct configuration on things - * like limits. - */ -#ifdef PNG_CONFIGURE_LIBPNG -# ifdef HAVE_CONFIG_H -# include "config.h" -# endif -#endif +typedef const png_uint_16p * png_const_uint_16pp; /* Moved to pngpriv.h at libpng-1.5.0 */ /* NOTE: some of these may have been used in external applications as * these definitions were exposed in pngconf.h prior to 1.5. @@ -228,32 +280,8 @@ # undef PNG_ZBUF_SIZE # define PNG_ZBUF_SIZE 65536L #endif -/* PNG_STATIC is used to mark internal file scope functions if they need to be - * accessed for implementation tests (see the code in tests/?*). - */ -#ifndef PNG_STATIC -# define PNG_STATIC static -#endif - -/* C99 restrict is used where possible, to do this 'restrict' is defined as - * empty if we can't be sure it is supported. configure builds have already - * done this work. - */ -#ifdef PNG_CONFIGURE_LIBPNG -# define PNG_RESTRICT restrict -#else - /* Modern compilers support restrict, but assume not for anything not - * recognized here: - */ -# if defined __GNUC__ || defined _MSC_VER || defined __WATCOMC__ -# define PNG_RESTRICT restrict -# else -# define PNG_RESTRICT -# endif -#endif - /* If warnings or errors are turned off the code is disabled or redirected here. * From 1.5.4 functions have been added to allow very limited formatting of * error and warning messages - this code will also be disabled here. */ @@ -280,25 +308,20 @@ * const is not cast away. */ #ifdef __cplusplus # define png_voidcast(type, value) static_cast(value) +# define png_constcast(type, value) const_cast(value) +# define png_aligncast(type, value) \ + static_cast(static_cast(value)) +# define png_aligncastconst(type, value) \ + static_cast(static_cast(value)) #else # define png_voidcast(type, value) (value) +# define png_constcast(type, value) ((type)(value)) +# define png_aligncast(type, value) ((void*)(value)) +# define png_aligncastconst(type, value) ((const void*)(value)) #endif /* __cplusplus */ -#ifndef PNG_EXTERN -/* The functions exported by PNG_EXTERN are internal functions, which - * aren't usually used outside the library (as far as I know), so it is - * debatable if they should be exported at all. In the future, when it - * is possible to have run-time registry of chunk-handling functions, - * some of these might be made available again. - * - * 1.5.7: turned the use of 'extern' back on, since it is localized to pngpriv.h - * it should be safe now (it is unclear why it was turned off.) - */ -# define PNG_EXTERN extern -#endif - /* Some fixed point APIs are still required even if not exported because * they get used by the corresponding floating point APIs. This magic * deals with this: */ @@ -366,36 +389,8 @@ # define PNG_ABORT() abort() # endif #endif -#ifdef USE_FAR_KEYWORD -/* Use this to make far-to-near assignments */ -# define CHECK 1 -# define NOCHECK 0 -# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK)) -# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK)) -# define png_strlen _fstrlen -# define png_memcmp _fmemcmp /* SJT: added */ -# define png_memcpy _fmemcpy -# define png_memset _fmemset -#else -# ifdef _WINDOWS_ /* Favor Windows over C runtime fns */ -# define CVT_PTR(ptr) (ptr) -# define CVT_PTR_NOCHECK(ptr) (ptr) -# define png_strlen lstrlenA -# define png_memcmp memcmp -# define png_memcpy CopyMemory -# define png_memset memset -# else -# define CVT_PTR(ptr) (ptr) -# define CVT_PTR_NOCHECK(ptr) (ptr) -# define png_strlen strlen -# define png_memcmp memcmp /* SJT: added */ -# define png_memcpy memcpy -# define png_memset memset -# endif -#endif - /* These macros may need to be architecture dependent. */ #define PNG_ALIGN_NONE 0 /* do not use data alignment */ #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ #ifdef offsetof @@ -456,18 +451,19 @@ /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ #define PNG_HAVE_IDAT 0x04 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ #define PNG_HAVE_IEND 0x10 -#define PNG_HAVE_gAMA 0x20 -#define PNG_HAVE_cHRM 0x40 -#define PNG_HAVE_sRGB 0x80 + /* 0x20 (unused) */ + /* 0x40 (unused) */ + /* 0x80 (unused) */ #define PNG_HAVE_CHUNK_HEADER 0x100 #define PNG_WROTE_tIME 0x200 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 #define PNG_BACKGROUND_IS_GRAY 0x800 #define PNG_HAVE_PNG_SIGNATURE 0x1000 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ -#define PNG_HAVE_iCCP 0x4000 + /* 0x4000 (unused) */ +#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ /* Flags for the transformations the PNG library does on the image data */ #define PNG_BGR 0x0001 #define PNG_INTERLACE 0x0002 @@ -510,13 +506,13 @@ #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) /* Flags for the png_ptr->flags rather than declaring a byte for each one */ #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 -#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 -#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 -#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 -#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 -#define PNG_FLAG_ZLIB_FINISHED 0x0020 +#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ + /* 0x0004 unused */ +#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ + /* 0x0010 unused */ + /* 0x0020 unused */ #define PNG_FLAG_ROW_INIT 0x0040 #define PNG_FLAG_FILLER_AFTER 0x0080 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 @@ -524,22 +520,22 @@ #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ -#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 -#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 +/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ +/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 -#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000 - /* 0x200000 unused */ - /* 0x400000 unused */ -#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000 /* Added to libpng-1.4.0 */ -#define PNG_FLAG_ZTXT_CUSTOM_STRATEGY 0x1000000 /* 5 lines added */ -#define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000 /* to libpng-1.5.4 */ -#define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000 -#define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000 -#define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000 +#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ +#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ +#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ + /* 0x800000 unused */ + /* 0x1000000 unused */ + /* 0x2000000 unused */ + /* 0x4000000 unused */ + /* 0x8000000 unused */ + /* 0x10000000 unused */ /* 0x20000000 unused */ /* 0x40000000 unused */ #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ @@ -550,26 +546,45 @@ #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ PNG_FLAG_CRC_CRITICAL_MASK) -/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib - * can handle at once. This type need be no larger than 16 bits (so maximum of - * 65535), this define allows us to discover how big it is, but limited by the - * maximuum for png_size_t. The value can be overriden in a library build - * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably - * lower value (e.g. 255 works). A lower value may help memory usage (slightly) - * and may even improve performance on some systems (and degrade it on others.) - */ -#ifndef ZLIB_IO_MAX -# define ZLIB_IO_MAX ((uInt)-1) -#endif - /* Save typing and make code easier to understand */ #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ abs((int)((c1).green) - (int)((c2).green)) + \ abs((int)((c1).blue) - (int)((c2).blue))) +/* Added to libpng-1.5.7: sRGB conversion tables */ +#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\ + defined PNG_SIMPLIFIED_WRITE_SUPPORTED +#ifdef PNG_SIMPLIFIED_READ_SUPPORTED +PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); + /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, + * 0..65535. This table gives the closest 16-bit answers (no errors). + */ +#endif + +PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); +PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); + +#define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ + ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) + /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB + * encoded value with maximum error 0.646365. Note that the input is not a + * 16-bit value; it has been multiplied by 255! */ +#endif /* PNG_SIMPLIFIED_READ/WRITE */ + +/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 + * by dividing by 257 *with rounding*. This macro is exact for the given range. + * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the + * macro were established by experiment (modifying the added value). The macro + * has a second variant that takes a value already scaled by 255 and divides by + * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it + * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. + */ +#define PNG_DIV65535(v24) (((v24) + 32895) >> 16) +#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) + /* Added to libpng-1.2.6 JB */ #define PNG_ROWBYTES(pixel_bits, width) \ ((pixel_bits) >= 8 ? \ ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ @@ -615,12 +630,12 @@ */ #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) -#else -PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp, - png_const_charp text)); #endif +/* else the corresponding function is defined below, inside the scope of the + * cplusplus test. + */ #endif /* Constants for known chunk types. If you need to add a chunk, define the name * here. For historical reasons these constants have the form png_; i.e. @@ -697,255 +712,270 @@ #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ -/* These functions are used internally in the code. They generally - * shouldn't be used unless you are writing code to add or replace some - * functionality in libpng. More information about most functions can - * be found in the files where the functions are located. +/* Internal functions; these are not exported from a DLL however because they + * are used within several of the C source files they have to be C extern. + * + * All of these functions must be declared with PNG_INTERNAL_FUNCTION. */ +/* Zlib support */ +#define PNG_UNEXPECTED_ZLIB_RETURN (-7) +PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), + PNG_EMPTY); + /* Used by the zlib handling functions to ensure that z_stream::msg is always + * set before they return. + */ + +#ifdef PNG_WRITE_SUPPORTED +PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, + png_compression_bufferp *list),PNG_EMPTY); + /* Free the buffer list used by the compressed write code. */ +#endif + +#if defined(PNG_FLOATING_POINT_SUPPORTED) && \ + !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ + (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ + defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ + defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ + (defined(PNG_sCAL_SUPPORTED) && \ + defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) +PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, + double fp, png_const_charp text),PNG_EMPTY); +#endif + /* Check the user version string for compatibility, returns false if the version * numbers aren't compatible. */ -PNG_EXTERN int png_user_version_check(png_structp png_ptr, - png_const_charp user_png_ver); +PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, + png_const_charp user_png_ver),PNG_EMPTY); -/* Allocate memory for an internal libpng struct */ -PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)), - PNG_ALLOCATED); +/* Internal base allocator - no messages, NULL on failure to allocate. This + * does, however, call the application provided allocator and that could call + * png_error (although that would be a bug in the application implementation.) + */ +PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, + png_alloc_size_t size),PNG_ALLOCATED); + +/* Magic to create a struct when there is no struct to call the user supplied + * memory allocators. Because error handling has not been set up the memory + * handlers can't safely call png_error, but this is an obscure and undocumented + * restriction so libpng has to assume that the 'free' handler, at least, might + * call png_error. + */ +PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, + (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, + png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, + png_free_ptr free_fn),PNG_ALLOCATED); /* Free memory from internal libpng struct */ -PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); - -PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2, - PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)), - PNG_ALLOCATED); -PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, - png_free_ptr free_fn, png_voidp mem_ptr)); +PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), + PNG_EMPTY); -/* Free any memory that info_ptr points to and reset struct. */ -PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, - png_infop info_ptr)); +/* Free an allocated jmp_buf (always succeeds) */ +PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); /* Function to allocate memory for zlib. PNGAPI is disallowed. */ -PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items, - uInt size)),PNG_ALLOCATED); +PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), + PNG_ALLOCATED); /* Function to free memory for zlib. PNGAPI is disallowed. */ -PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); +PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); /* Next four functions are used internally as callbacks. PNGCBAPI is required * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to * PNGCBAPI at 1.5.0 */ -PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr, - png_bytep data, png_size_t length)); +PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, + png_bytep data, png_size_t length),PNG_EMPTY); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED -PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr, - png_bytep buffer, png_size_t length)); +PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, + png_bytep buffer, png_size_t length),PNG_EMPTY); #endif -PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr, - png_bytep data, png_size_t length)); +PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, + png_bytep data, png_size_t length),PNG_EMPTY); #ifdef PNG_WRITE_FLUSH_SUPPORTED # ifdef PNG_STDIO_SUPPORTED -PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), + PNG_EMPTY); # endif #endif /* Reset the CRC variable */ -PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); /* Write the "data" buffer to whatever output you are using */ -PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, - png_const_bytep data, png_size_t length)); +PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, + png_const_bytep data, png_size_t length),PNG_EMPTY); /* Read and check the PNG file signature */ -PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr)); +PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); /* Read the chunk header (length + type name) */ -PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), + PNG_EMPTY); /* Read data from whatever input you are using into the "data" buffer */ -PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, - png_size_t length)); +PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, + png_size_t length),PNG_EMPTY); /* Read bytes into buf, and update png_ptr->crc */ -PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, - png_size_t length)); - -/* Decompress data in a chunk that uses compression */ -#if defined(PNG_READ_COMPRESSED_TEXT_SUPPORTED) -PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, - int comp_type, png_size_t chunklength, png_size_t prefix_length, - png_size_t *data_length)); -#endif +PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, + png_uint_32 length),PNG_EMPTY); /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ -PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); +PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, + png_uint_32 skip),PNG_EMPTY); /* Read the CRC from the file and compare it to the libpng calculated CRC */ -PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); /* Calculate the CRC over a section of data. Note that we are only * passing a maximum of 64K on systems that have this as a memory limit, * since this is the maximum buffer size we can specify. */ -PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, - png_const_bytep ptr, png_size_t length)); +PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, + png_const_bytep ptr, png_size_t length),PNG_EMPTY); #ifdef PNG_WRITE_FLUSH_SUPPORTED -PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); #endif /* Write various chunks */ /* Write the IHDR chunk, and update the png_struct with the necessary * information. */ -PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, - png_uint_32 height, - int bit_depth, int color_type, int compression_method, int filter_method, - int interlace_method)); - -PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, - png_const_colorp palette, png_uint_32 num_pal)); - -PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, - png_size_t length)); +PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, + png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, + int compression_method, int filter_method, int interlace_method),PNG_EMPTY); + +PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, + png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); + +PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, + png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), + PNG_EMPTY); -PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); #ifdef PNG_WRITE_gAMA_SUPPORTED -# ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); -# endif -# ifdef PNG_FIXED_POINT_SUPPORTED -PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, - png_fixed_point file_gamma)); -# endif +PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, + png_fixed_point file_gamma),PNG_EMPTY); #endif #ifdef PNG_WRITE_sBIT_SUPPORTED -PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, - png_const_color_8p sbit, int color_type)); +PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, + png_const_color_8p sbit, int color_type),PNG_EMPTY); #endif #ifdef PNG_WRITE_cHRM_SUPPORTED -# ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, - double white_x, double white_y, - double red_x, double red_y, double green_x, double green_y, - double blue_x, double blue_y)); -# endif -PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, - png_fixed_point int_white_x, png_fixed_point int_white_y, - png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point - int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, - png_fixed_point int_blue_y)); +PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, + const png_xy *xy), PNG_EMPTY); + /* The xy value must have been previously validated */ #endif #ifdef PNG_WRITE_sRGB_SUPPORTED -PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, - int intent)); +PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, + int intent),PNG_EMPTY); #endif #ifdef PNG_WRITE_iCCP_SUPPORTED -PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, - png_const_charp name, int compression_type, - png_const_charp profile, int proflen)); - /* Note to maintainer: profile should be png_bytep */ +PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, + png_const_charp name, png_const_bytep profile), PNG_EMPTY); + /* The profile must have been previously validated for correctness, the + * length comes from the first four bytes. Only the base, deflate, + * compression is supported. + */ #endif #ifdef PNG_WRITE_sPLT_SUPPORTED -PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, - png_const_sPLT_tp palette)); +PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, + png_const_sPLT_tp palette),PNG_EMPTY); #endif #ifdef PNG_WRITE_tRNS_SUPPORTED -PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, +PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, png_const_bytep trans, png_const_color_16p values, int number, - int color_type)); + int color_type),PNG_EMPTY); #endif #ifdef PNG_WRITE_bKGD_SUPPORTED -PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, - png_const_color_16p values, int color_type)); +PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, + png_const_color_16p values, int color_type),PNG_EMPTY); #endif #ifdef PNG_WRITE_hIST_SUPPORTED -PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, - png_const_uint_16p hist, int num_hist)); +PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, + png_const_uint_16p hist, int num_hist),PNG_EMPTY); #endif /* Chunks that have keywords */ -#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ - defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) -PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, - png_const_charp key, png_charpp new_key)); -#endif - #ifdef PNG_WRITE_tEXt_SUPPORTED -PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key, - png_const_charp text, png_size_t text_len)); +PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, + png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); #endif #ifdef PNG_WRITE_zTXt_SUPPORTED -PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key, - png_const_charp text, png_size_t text_len, int compression)); +PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp + key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); #endif #ifdef PNG_WRITE_iTXt_SUPPORTED -PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, +PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, int compression, png_const_charp key, png_const_charp lang, - png_const_charp lang_key, png_const_charp text)); + png_const_charp lang_key, png_const_charp text),PNG_EMPTY); #endif #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ -PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, - png_infop info_ptr, png_const_textp text_ptr, int num_text)); +PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, + png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); #endif #ifdef PNG_WRITE_oFFs_SUPPORTED -PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, - png_int_32 x_offset, png_int_32 y_offset, int unit_type)); +PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, + png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); #endif #ifdef PNG_WRITE_pCAL_SUPPORTED -PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, - png_int_32 X0, png_int_32 X1, int type, int nparams, - png_const_charp units, png_charpp params)); +PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, + png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, + png_const_charp units, png_charpp params),PNG_EMPTY); #endif #ifdef PNG_WRITE_pHYs_SUPPORTED -PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, +PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, - int unit_type)); + int unit_type),PNG_EMPTY); #endif #ifdef PNG_WRITE_tIME_SUPPORTED -PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, - png_const_timep mod_time)); +PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, + png_const_timep mod_time),PNG_EMPTY); #endif #ifdef PNG_WRITE_sCAL_SUPPORTED -PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, - int unit, png_const_charp width, png_const_charp height)); +PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, + int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); #endif /* Called when finished processing a row of data */ -PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), + PNG_EMPTY); /* Internal use only. Called before first row of data */ -PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), + PNG_EMPTY); /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an * array of png_ptr->width pixels. If the image is not interlaced or this - * is the final pass this just does a png_memcpy, otherwise the "display" flag + * is the final pass this just does a memcpy, otherwise the "display" flag * is used to determine whether to copy pixels that are not in the current pass. * * Because 'png_do_read_interlace' (below) replicates pixels this allows this * function to achieve the documented 'blocky' appearance during interlaced read @@ -967,464 +997,519 @@ */ #ifndef PNG_USE_COMPILE_TIME_MASKS # define PNG_USE_COMPILE_TIME_MASKS 1 #endif -PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, - int display)); +PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, + png_bytep row, int display),PNG_EMPTY); #ifdef PNG_READ_INTERLACING_SUPPORTED /* Expand an interlaced row: the 'row_info' describes the pass data that has * been read in and must correspond to the pixels in 'row', the pixels are * expanded (moved apart) in 'row' to match the final layout, when doing this * the pixels are *replicated* to the intervening space. This is essential for * the correct operation of png_combine_row, above. */ -PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, - png_bytep row, int pass, png_uint_32 transformations)); +PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, + png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); #endif /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Grab pixels out of a row for an interlaced pass */ -PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, - png_bytep row, int pass)); +PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, + png_bytep row, int pass),PNG_EMPTY); #endif /* Unfilter a row: check the filter value before calling this, there is no point * calling it for PNG_FILTER_VALUE_NONE. */ -PNG_EXTERN void png_read_filter_row PNGARG((png_structp pp, png_row_infop - row_info, png_bytep row, png_const_bytep prev_row, int filter)); +PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop + row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); -PNG_EXTERN void png_read_filter_row_up_neon PNGARG((png_row_infop row_info, - png_bytep row, png_const_bytep prev_row)); -PNG_EXTERN void png_read_filter_row_sub3_neon PNGARG((png_row_infop row_info, - png_bytep row, png_const_bytep prev_row)); -PNG_EXTERN void png_read_filter_row_sub4_neon PNGARG((png_row_infop row_info, - png_bytep row, png_const_bytep prev_row)); -PNG_EXTERN void png_read_filter_row_avg3_neon PNGARG((png_row_infop row_info, - png_bytep row, png_const_bytep prev_row)); -PNG_EXTERN void png_read_filter_row_avg4_neon PNGARG((png_row_infop row_info, - png_bytep row, png_const_bytep prev_row)); -PNG_EXTERN void png_read_filter_row_paeth3_neon PNGARG((png_row_infop row_info, - png_bytep row, png_const_bytep prev_row)); -PNG_EXTERN void png_read_filter_row_paeth4_neon PNGARG((png_row_infop row_info, - png_bytep row, png_const_bytep prev_row)); +PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, + png_bytep row, png_const_bytep prev_row),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop + row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop + row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop + row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop + row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop + row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop + row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); /* Choose the best filter to use and filter the row data */ -PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, - png_row_infop row_info)); +PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, + png_row_infop row_info),PNG_EMPTY); +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED +PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, + png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); + /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer + * is NULL the function checks, instead, for the end of the stream. In this + * case a benign error will be issued if the stream end is not found or if + * extra data has to be consumed. + */ +PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), + PNG_EMPTY); + /* This cleans up when the IDAT LZ stream does not end when the last image + * byte is read; there is still some pending input. + */ + +PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), + PNG_EMPTY); /* Finish a row while reading, dealing with interlacing passes, etc. */ -PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); +#endif /* Initialize the row buffers, etc. */ -PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); #ifdef PNG_READ_TRANSFORMS_SUPPORTED /* Optional call to update the users info structure */ -PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); #endif /* These are the functions that do the transformations */ #ifdef PNG_READ_FILLER_SUPPORTED -PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, - png_bytep row, png_uint_32 filler, png_uint_32 flags)); +PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info, + png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY); #endif #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED -PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED -PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED -PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED -PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ defined(PNG_READ_STRIP_ALPHA_SUPPORTED) -PNG_EXTERN void png_do_strip_channel PNGARG((png_row_infop row_info, - png_bytep row, int at_start)); +PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, + png_bytep row, int at_start),PNG_EMPTY); #endif #ifdef PNG_16BIT_SUPPORTED #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) -PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #endif #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ defined(PNG_WRITE_PACKSWAP_SUPPORTED) -PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED -PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, - png_row_infop row_info, png_bytep row)); +PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr, + png_row_infop row_info, png_bytep row),PNG_EMPTY); #endif #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED -PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_READ_PACK_SUPPORTED -PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_READ_SHIFT_SUPPORTED -PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, - png_bytep row, png_const_color_8p sig_bits)); +PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info, + png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY); #endif #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) -PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED -PNG_EXTERN void png_do_scale_16_to_8 PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED -PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_READ_QUANTIZE_SUPPORTED -PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info, +PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info, png_bytep row, png_const_bytep palette_lookup, - png_const_bytep quantize_lookup)); + png_const_bytep quantize_lookup),PNG_EMPTY); # ifdef PNG_CORRECT_PALETTE_SUPPORTED -PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, - png_colorp palette, int num_palette)); +PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr, + png_colorp palette, int num_palette),PNG_EMPTY); # endif #endif #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) -PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif #ifdef PNG_WRITE_PACK_SUPPORTED -PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, - png_bytep row, png_uint_32 bit_depth)); +PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info, + png_bytep row, png_uint_32 bit_depth),PNG_EMPTY); #endif #ifdef PNG_WRITE_SHIFT_SUPPORTED -PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, - png_bytep row, png_const_color_8p bit_depth)); +PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info, + png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY); #endif #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ defined(PNG_READ_ALPHA_MODE_SUPPORTED) -PNG_EXTERN void png_do_compose PNGARG((png_row_infop row_info, - png_bytep row, png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info, + png_bytep row, png_structrp png_ptr),PNG_EMPTY); #endif #ifdef PNG_READ_GAMMA_SUPPORTED -PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, - png_bytep row, png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info, + png_bytep row, png_structrp png_ptr),PNG_EMPTY); #endif #ifdef PNG_READ_ALPHA_MODE_SUPPORTED -PNG_EXTERN void png_do_encode_alpha PNGARG((png_row_infop row_info, - png_bytep row, png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info, + png_bytep row, png_structrp png_ptr),PNG_EMPTY); #endif #ifdef PNG_READ_EXPAND_SUPPORTED -PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, +PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info, png_bytep row, png_const_colorp palette, png_const_bytep trans, - int num_trans)); -PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, - png_bytep row, png_const_color_16p trans_color)); + int num_trans),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info, + png_bytep row, png_const_color_16p trans_color),PNG_EMPTY); #endif #ifdef PNG_READ_EXPAND_16_SUPPORTED -PNG_EXTERN void png_do_expand_16 PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); #endif /* The following decodes the appropriate chunks, and does error correction, * then calls the appropriate callback for the chunk if it is valid. */ /* Decode the IHDR chunk */ -PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); -PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); -PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #ifdef PNG_READ_bKGD_SUPPORTED -PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_cHRM_SUPPORTED -PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_gAMA_SUPPORTED -PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_hIST_SUPPORTED -PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_iCCP_SUPPORTED -PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif /* PNG_READ_iCCP_SUPPORTED */ #ifdef PNG_READ_iTXt_SUPPORTED -PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_oFFs_SUPPORTED -PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_pCAL_SUPPORTED -PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_pHYs_SUPPORTED -PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_sBIT_SUPPORTED -PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_sCAL_SUPPORTED -PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_sPLT_SUPPORTED -PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif /* PNG_READ_sPLT_SUPPORTED */ #ifdef PNG_READ_sRGB_SUPPORTED -PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_tEXt_SUPPORTED -PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_tIME_SUPPORTED -PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_tRNS_SUPPORTED -PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif #ifdef PNG_READ_zTXt_SUPPORTED -PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, - png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); #endif -PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 length)); +PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, + png_uint_32 chunk_name),PNG_EMPTY); -PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, - png_uint_32 chunk_name)); +#ifdef PNG_READ_SUPPORTED +PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); + /* This is the function that gets called for unknown chunks. The 'keep' + * argument is either non-zero for a known chunk that has been set to be + * handled as unknown or zero for an unknown chunk. By default the function + * just skips the chunk or errors out if it is critical. + */ -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED -/* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk - * name, not a string. +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED +PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, + (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); + /* Exactly as the API png_handle_as_unknown() except that the argument is a + * 32-bit chunk name, not a string. */ -PNG_EXTERN int png_chunk_unknown_handling PNGARG((png_structp png_ptr, - png_uint_32 chunk_name)); #endif +#endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ +#endif /* PNG_READ_SUPPORTED */ /* Handle the transformations for reading and writing */ #ifdef PNG_READ_TRANSFORMS_SUPPORTED -PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr, - png_row_infop row_info)); +PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, + png_row_infop row_info),PNG_EMPTY); #endif #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED -PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr, - png_row_infop row_info)); +PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, + png_row_infop row_info),PNG_EMPTY); #endif #ifdef PNG_READ_TRANSFORMS_SUPPORTED -PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), + PNG_EMPTY); #endif #ifdef PNG_PROGRESSIVE_READ_SUPPORTED -PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, - png_infop info_ptr)); -PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, - png_infop info_ptr)); -PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); -PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, - png_uint_32 length)); -PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); -PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); -PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, - png_bytep buffer, png_size_t buffer_length)); -PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); -PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, - png_bytep buffer, png_size_t buffer_length)); -PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); -PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 length)); -PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, - png_infop info_ptr)); -PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, - png_infop info_ptr)); -PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); -PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, - png_infop info_ptr)); -PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, - png_infop info_ptr)); -PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); +PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, + png_uint_32 length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), + PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), + PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, + png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, + png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), + PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, + png_bytep row),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), + PNG_EMPTY); # ifdef PNG_READ_tEXt_SUPPORTED -PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 length)); -PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); # endif # ifdef PNG_READ_zTXt_SUPPORTED -PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 length)); -PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); # endif # ifdef PNG_READ_iTXt_SUPPORTED -PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, - png_infop info_ptr, png_uint_32 length)); -PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, - png_infop info_ptr)); +PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, + png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, + png_inforp info_ptr),PNG_EMPTY); # endif #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ #ifdef PNG_MNG_FEATURES_SUPPORTED -PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, - png_bytep row)); -PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, - png_bytep row)); +PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info, + png_bytep row),PNG_EMPTY); +#endif + +/* Added at libpng version 1.6.0 */ +#ifdef PNG_GAMMA_SUPPORTED +PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); + /* Set the colorspace gamma with a value provided by the application or by + * the gAMA chunk on read. The value will override anything set by an ICC + * profile. + */ + +PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, + png_inforp info_ptr), PNG_EMPTY); + /* Synchronize the info 'valid' flags with the colorspace */ + +PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, + png_inforp info_ptr), PNG_EMPTY); + /* Copy the png_struct colorspace to the info_struct and call the above to + * synchronize the flags. Checks for NULL info_ptr and does nothing. + */ #endif /* Added at libpng version 1.4.0 */ -#ifdef PNG_CHECK_cHRM_SUPPORTED -PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, - png_fixed_point int_white_x, png_fixed_point int_white_y, - png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point - int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, - png_fixed_point int_blue_y)); -#endif - -#ifdef PNG_CHECK_cHRM_SUPPORTED -/* Added at libpng version 1.2.34 and 1.4.0 */ -/* Currently only used by png_check_cHRM_fixed */ -PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, - unsigned long *hi_product, unsigned long *lo_product)); -#endif - -#ifdef PNG_cHRM_SUPPORTED -/* Added at libpng version 1.5.5 */ -typedef struct png_xy -{ - png_fixed_point redx, redy; - png_fixed_point greenx, greeny; - png_fixed_point bluex, bluey; - png_fixed_point whitex, whitey; -} png_xy; - -typedef struct png_XYZ -{ - png_fixed_point redX, redY, redZ; - png_fixed_point greenX, greenY, greenZ; - png_fixed_point blueX, blueY, blueZ; -} png_XYZ; - -/* The conversion APIs return 0 on success, non-zero on a parameter error. They - * allow conversion between the above representations of a color encoding. When - * converting from XYZ end points to chromaticities the absolute magnitude of - * the end points is lost, when converting back the sum of the Y values of the - * three end points will be 1.0 - */ -PNG_EXTERN int png_xy_from_XYZ PNGARG((png_xy *xy, png_XYZ XYZ)); -PNG_EXTERN int png_XYZ_from_xy PNGARG((png_XYZ *XYZ, png_xy xy)); -PNG_EXTERN int png_XYZ_from_xy_checked PNGARG((png_structp png_ptr, - png_XYZ *XYZ, png_xy xy)); +#ifdef PNG_COLORSPACE_SUPPORTED +/* These internal functions are for maintaining the colorspace structure within + * a png_info or png_struct (or, indeed, both). + */ +PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, + (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, + int preferred), PNG_EMPTY); + +PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, + (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, + int preferred), PNG_EMPTY); + +#ifdef PNG_sRGB_SUPPORTED +PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, + png_colorspacerp colorspace, int intent), PNG_EMPTY); + /* This does set the colorspace gAMA and cHRM values too, but doesn't set the + * flags to write them, if it returns false there was a problem and an error + * message has already been output (but the colorspace may still need to be + * synced to record the invalid flag). + */ +#endif /* sRGB */ + +#ifdef PNG_iCCP_SUPPORTED +PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_const_charp name, + png_uint_32 profile_length, png_const_bytep profile, int color_type), + PNG_EMPTY); + /* The 'name' is used for information only */ + +/* Routines for checking parts of an ICC profile. */ +PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_const_charp name, + png_uint_32 profile_length), PNG_EMPTY); +PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_const_charp name, + png_uint_32 profile_length, + png_const_bytep profile /* first 132 bytes only */, int color_type), + PNG_EMPTY); +PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, + png_colorspacerp colorspace, png_const_charp name, + png_uint_32 profile_length, + png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); +#ifdef PNG_sRGB_SUPPORTED +PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( + png_const_structrp png_ptr, png_colorspacerp colorspace, + png_const_bytep profile, uLong adler), PNG_EMPTY); + /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may + * be zero to indicate that it is not available. It is used, if provided, + * as a fast check on the profile when checking to see if it is sRGB. + */ #endif +#endif /* iCCP */ + +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED +PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, + (png_structrp png_ptr), PNG_EMPTY); + /* Set the rgb_to_gray coefficients from the colorspace Y values */ +#endif /* READ_RGB_TO_GRAY */ +#endif /* COLORSPACE */ /* Added at libpng version 1.4.0 */ -PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, +PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_type, int compression_type, - int filter_type)); + int filter_type),PNG_EMPTY); /* Added at libpng version 1.5.10 */ #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) -PNG_EXTERN void png_do_check_palette_indexes PNGARG((png_structp png_ptr, - png_row_infop row_info)); +PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, + (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); #endif -/* Free all memory used by the read (old method - NOT DLL EXPORTED) */ -PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, - png_infop info_ptr, png_infop end_info_ptr)); - -/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ -PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr)); - -#ifdef USE_FAR_KEYWORD /* memory model conversion function */ -PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr, - int check)); -#endif /* USE_FAR_KEYWORD */ - #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) -PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr, +PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, png_const_charp name),PNG_NORETURN); #endif /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite * the end. Always leaves the buffer nul terminated. Never errors out (and * there is no error code.) */ -PNG_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos, - png_const_charp string); +PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, + size_t pos, png_const_charp string),PNG_EMPTY); /* Various internal functions to handle formatted warning messages, currently * only implemented for warnings. */ @@ -1433,10 +1518,10 @@ * and end pointer (which should point just *beyond* the end of the buffer!) * Returns the pointer to the start of the formatted string. This utility only * does unsigned values. */ -PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end, - int format, png_alloc_size_t number); +PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, + png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); /* Convenience macro that takes an array: */ #define PNG_FORMAT_NUMBER(buffer,format,number) \ png_format_number(buffer, buffer + (sizeof buffer), format, number) @@ -1458,58 +1543,107 @@ #ifdef PNG_WARNINGS_SUPPORTED /* New defines and members adding in libpng-1.5.4 */ # define PNG_WARNING_PARAMETER_SIZE 32 -# define PNG_WARNING_PARAMETER_COUNT 8 +# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ /* An l-value of this type has to be passed to the APIs below to cache the * values of the parameters to a formatted warning message. */ typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ PNG_WARNING_PARAMETER_SIZE]; -PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number, - png_const_charp string); +PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, + int number, png_const_charp string),PNG_EMPTY); /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, * including the trailing '\0'. */ -PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p, - int number, int format, png_alloc_size_t value); +PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, + (png_warning_parameters p, int number, int format, png_alloc_size_t value), + PNG_EMPTY); /* Use png_alloc_size_t because it is an unsigned type as big as any we * need to output. Use the following for a signed value. */ -PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p, - int number, int format, png_int_32 value); +PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, + (png_warning_parameters p, int number, int format, png_int_32 value), + PNG_EMPTY); -PNG_EXTERN void png_formatted_warning(png_structp png_ptr, - png_warning_parameters p, png_const_charp message); +PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, + png_warning_parameters p, png_const_charp message),PNG_EMPTY); /* 'message' follows the X/Open approach of using @1, @2 to insert * parameters previously supplied using the above functions. Errors in - * specifying the paramters will simple result in garbage substitutions. + * specifying the parameters will simply result in garbage substitutions. + */ +#endif + +#ifdef PNG_BENIGN_ERRORS_SUPPORTED +/* Application errors (new in 1.6); use these functions (declared below) for + * errors in the parameters or order of API function calls on read. The + * 'warning' should be used for an error that can be handled completely; the + * 'error' for one which can be handled safely but which may lose application + * information or settings. + * + * By default these both result in a png_error call prior to release, while in a + * released version the 'warning' is just a warning. However if the application + * explicitly disables benign errors (explicitly permitting the code to lose + * information) they both turn into warnings. + * + * If benign errors aren't supported they end up as the corresponding base call + * (png_warning or png_error.) + */ +PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, + png_const_charp message),PNG_EMPTY); + /* The application provided invalid parameters to an API function or called + * an API function at the wrong time, libpng can completely recover. */ + +PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, + png_const_charp message),PNG_EMPTY); + /* As above but libpng will ignore the call, or attempt some other partial + * recovery from the error. + */ +#else +# define png_app_warning(pp,s) png_warning(pp,s) +# define png_app_error(pp,s) png_error(pp,s) #endif +PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, + png_const_charp message, int error),PNG_EMPTY); + /* Report a recoverable issue in chunk data. On read this is used to report + * a problem found while reading a particular chunk and the + * png_chunk_benign_error or png_chunk_warning function is used as + * appropriate. On write this is used to report an error that comes from + * data set via an application call to a png_set_ API and png_app_error or + * png_app_warning is used as appropriate. + * + * The 'error' parameter must have one of the following values: + */ +#define PNG_CHUNK_WARNING 0 /* never an error */ +#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ +#define PNG_CHUNK_ERROR 2 /* always an error */ + /* ASCII to FP interfaces, currently only implemented if sCAL * support is required. */ -#if defined(PNG_READ_sCAL_SUPPORTED) +#if defined(PNG_sCAL_SUPPORTED) /* MAX_DIGITS is actually the maximum number of characters in an sCAL * width or height, derived from the precision (number of significant - * digits - a build time settable option) and assumpitions about the + * digits - a build time settable option) and assumptions about the * maximum ridiculous exponent. */ #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) #ifdef PNG_FLOATING_POINT_SUPPORTED -PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii, - png_size_t size, double fp, unsigned int precision)); +PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, + png_charp ascii, png_size_t size, double fp, unsigned int precision), + PNG_EMPTY); #endif /* FLOATING_POINT */ #ifdef PNG_FIXED_POINT_SUPPORTED -PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr, - png_charp ascii, png_size_t size, png_fixed_point fp)); +PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, + png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); #endif /* FIXED_POINT */ -#endif /* READ_sCAL */ +#endif /* sCAL */ #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) /* An internal API to validate the format of a floating point number. * The result is the index of the next character. If the number is @@ -1531,9 +1665,9 @@ * * NOTE: The dangling E problem. * There is a PNG valid floating point number in the following: * - * PNG floating point numb1.ers are not greedy. + * PNG floating point numbers are not greedy. * * Working this out requires *TWO* character lookahead (because of the * sign), the parser does not do this - it will fail at the 'r' - this * doesn't matter for PNG sCAL chunk values, but it requires more care @@ -1582,34 +1716,34 @@ #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) -/* The actual parser. This can be called repeatedly, it updates +/* The actual parser. This can be called repeatedly. It updates * the index into the string and the state variable (which must - * be initialzed to 0). It returns a result code, as above. There + * be initialized to 0). It returns a result code, as above. There * is no point calling the parser any more if it fails to advance to * the end of the string - it is stuck on an invalid character (or * terminated by '\0'). * - * Note that the pointer will consume an E or even an E+ then leave + * Note that the pointer will consume an E or even an E+ and then leave * a 'maybe' state even though a preceding integer.fraction is valid. * The PNG_FP_WAS_VALID flag indicates that a preceding substring was * a valid number. It's possible to recover from this by calling * the parser again (from the start, with state 0) but with a string * that omits the last character (i.e. set the size to the index of * the problem character.) This has not been tested within libpng. */ -PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string, - png_size_t size, int *statep, png_size_tp whereami)); +PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, + png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); /* This is the same but it checks a complete string and returns true * only if it just contains a floating point number. As of 1.5.4 this * function also returns the state at the end of parsing the number if * it was valid (otherwise it returns 0.) This can be used for testing * for negative or zero values using the sticky flag. */ -PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string, - png_size_t size)); +PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, + png_size_t size),PNG_EMPTY); #endif /* pCAL || sCAL */ #if defined(PNG_READ_GAMMA_SUPPORTED) ||\ defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) @@ -1618,31 +1752,39 @@ * if there is an overflow. The result is a boolean - false (0) * for overflow, true (1) if no overflow, in which case *res * holds the result. */ -PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a, - png_int_32 multiplied_by, png_int_32 divided_by)); +PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, + png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); #endif #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) /* Same deal, but issue a warning on overflow and return 0. */ -PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr, - png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by)); +PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, + (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, + png_int_32 divided_by),PNG_EMPTY); #endif -#ifdef PNG_READ_GAMMA_SUPPORTED +#ifdef PNG_GAMMA_SUPPORTED /* Calculate a reciprocal - used for gamma values. This returns - * 0 if the argument is 0 in order to maintain an undefined value, + * 0 if the argument is 0 in order to maintain an undefined value; * there are no warnings. */ -PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a)); +PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), + PNG_EMPTY); +#ifdef PNG_READ_GAMMA_SUPPORTED /* The same but gives a reciprocal of the product of two fixed point * values. Accuracy is suitable for gamma calculations but this is - * not exact - use png_muldiv for that. + * not exact - use png_muldiv for that. Only required at present on read. */ -PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a, - png_fixed_point b)); +PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, + png_fixed_point b),PNG_EMPTY); +#endif + +/* Return true if the gamma value is significantly different from 1.0 */ +PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), + PNG_EMPTY); #endif #ifdef PNG_READ_GAMMA_SUPPORTED /* Internal fixed point gamma correction. These APIs are called as @@ -1651,21 +1793,77 @@ * * While the input is an 'unsigned' value it must actually be the * correct bit value - 0..255 or 0..65535 as required. */ -PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr, - unsigned int value, png_fixed_point gamma_value)); -PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma_value)); -PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value, - png_fixed_point gamma_value)); -PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value, - png_fixed_point gamma_value)); -PNG_EXTERN void png_destroy_gamma_table(png_structp png_ptr); -PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr, - int bit_depth)); +PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, + unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, + png_fixed_point gamma_value),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, + png_fixed_point gamma_value),PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), + PNG_EMPTY); +PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, + int bit_depth),PNG_EMPTY); +#endif + +/* SIMPLIFIED READ/WRITE SUPPORT */ +#if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\ + defined PNG_SIMPLIFIED_WRITE_SUPPORTED +/* The internal structure that png_image::opaque points to. */ +typedef struct png_control +{ + png_structp png_ptr; + png_infop info_ptr; + png_voidp error_buf; /* Always a jmp_buf at present. */ + + png_const_bytep memory; /* Memory buffer. */ + png_size_t size; /* Size of the memory buffer. */ + + unsigned int for_write :1; /* Otherwise it is a read structure */ + unsigned int owned_file :1; /* We own the file in io_ptr */ +} png_control; + +/* Return the pointer to the jmp_buf from a png_control: necessary because C + * does not reveal the type of the elements of jmp_buf. + */ +#ifdef __cplusplus +# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) +#else +# define png_control_jmp_buf(pc) ((pc)->error_buf) +#endif + +/* Utility to safely execute a piece of libpng code catching and logging any + * errors that might occur. Returns true on success, false on failure (either + * of the function or as a result of a png_error.) + */ +PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr, + png_const_charp error_message),PNG_NORETURN); + +#ifdef PNG_WARNINGS_SUPPORTED +PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr, + png_const_charp warning_message),PNG_EMPTY); +#else +# define png_safe_warning 0/*dummy argument*/ #endif -/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ +PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, + int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); + +/* Utility to log an error; this also cleans up the png_image; the function + * always returns 0 (false). + */ +PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, + png_const_charp error_message),PNG_EMPTY); + +#ifndef PNG_SIMPLIFIED_READ_SUPPORTED +/* png_image_free is used by the write code but not exported */ +PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); +#endif /* !SIMPLIFIED_READ */ + +#endif /* SIMPLIFIED READ/WRITE */ + +/* Maintainer: Put new private prototypes here ^ */ #include "pngdebug.h" #ifdef __cplusplus diff -ru4NwbB libpng-1.5.13/pngread.c libpng-1.6.0beta32/pngread.c --- libpng-1.5.13/pngread.c 2012-09-27 06:21:19.705733304 -0500 +++ libpng-1.6.0beta32/pngread.c 2012-11-25 12:40:10.091137370 -0600 @@ -1,8 +1,8 @@ /* pngread.c - read a PNG file * - * Last changed in libpng 1.5.10 [March 8, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -14,20 +14,25 @@ * read a PNG file or stream. */ #include "pngpriv.h" +#if defined PNG_SIMPLIFIED_READ_SUPPORTED && defined PNG_STDIO_SUPPORTED +# include +#endif #ifdef PNG_READ_SUPPORTED /* Create a PNG structure for reading, and allocate any memory needed. */ PNG_FUNCTION(png_structp,PNGAPI png_create_read_struct,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) { - -#ifdef PNG_USER_MEM_SUPPORTED - return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn, - warn_fn, NULL, NULL, NULL)); +#ifndef PNG_USER_MEM_SUPPORTED + png_structp png_ptr = png_create_png_struct(user_png_ver, error_ptr, + error_fn, warn_fn, NULL, NULL, NULL); +#else + return png_create_read_struct_2(user_png_ver, error_ptr, error_fn, + warn_fn, NULL, NULL, NULL); } /* Alternate create PNG structure for reading, and allocate any memory * needed. @@ -36,133 +41,42 @@ png_create_read_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) { + png_structp png_ptr = png_create_png_struct(user_png_ver, error_ptr, + error_fn, warn_fn, mem_ptr, malloc_fn, free_fn); #endif /* PNG_USER_MEM_SUPPORTED */ -#ifdef PNG_SETJMP_SUPPORTED - volatile -#endif - png_structp png_ptr; - volatile int png_cleanup_needed = 0; - -#ifdef PNG_SETJMP_SUPPORTED -#ifdef USE_FAR_KEYWORD - jmp_buf tmp_jmpbuf; -#endif -#endif - - png_debug(1, "in png_create_read_struct"); + if (png_ptr != NULL) + { + png_ptr->mode = PNG_IS_READ_STRUCT; -#ifdef PNG_USER_MEM_SUPPORTED - png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, - malloc_fn, mem_ptr); -#else - png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); + /* Added in libpng-1.6.0; this can be used to detect a read structure if + * required (it will be zero in a write structure.) + */ +# ifdef PNG_SEQUENTIAL_READ_SUPPORTED + png_ptr->IDAT_read_size = PNG_IDAT_READ_SIZE; #endif - if (png_ptr == NULL) - return (NULL); - - /* Added at libpng-1.2.6 */ -#ifdef PNG_USER_LIMITS_SUPPORTED - png_ptr->user_width_max = PNG_USER_WIDTH_MAX; - png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; - - /* Added at libpng-1.2.43 and 1.4.0 */ - png_ptr->user_chunk_cache_max = PNG_USER_CHUNK_CACHE_MAX; - /* Added at libpng-1.2.43 and 1.4.1 */ - png_ptr->user_chunk_malloc_max = PNG_USER_CHUNK_MALLOC_MAX; -#endif +# ifdef PNG_BENIGN_READ_ERRORS_SUPPORTED + png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN; -#ifdef PNG_SETJMP_SUPPORTED -/* Applications that neglect to set up their own setjmp() and then - * encounter a png_error() will longjmp here. Since the jmpbuf is - * then meaningless we abort instead of returning. + /* In stable builds only warn if an application error can be completely + * handled. */ -#ifdef USE_FAR_KEYWORD - if (setjmp(tmp_jmpbuf)) -#else - if (setjmp(png_jmpbuf(png_ptr))) /* Sets longjmp to match setjmp */ -#endif - PNG_ABORT(); -#ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); -#endif -#endif /* PNG_SETJMP_SUPPORTED */ - -#ifdef PNG_USER_MEM_SUPPORTED - png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); +# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC + png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN; #endif - - png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - - /* Call the general version checker (shared with read and write code): */ - if (!png_user_version_check(png_ptr, user_png_ver)) - png_cleanup_needed = 1; - - if (!png_cleanup_needed) - { - /* Initialize zbuf - compression buffer */ - png_ptr->zbuf_size = PNG_ZBUF_SIZE; - png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, png_ptr->zbuf_size); - - if (png_ptr->zbuf == NULL) - png_cleanup_needed = 1; - } - - png_ptr->zstream.zalloc = png_zalloc; - png_ptr->zstream.zfree = png_zfree; - png_ptr->zstream.opaque = (voidpf)png_ptr; - - if (!png_cleanup_needed) - { - switch (inflateInit(&png_ptr->zstream)) - { - case Z_OK: - break; /* Do nothing */ - - case Z_MEM_ERROR: - png_warning(png_ptr, "zlib memory error"); - png_cleanup_needed = 1; - break; - - case Z_STREAM_ERROR: - png_warning(png_ptr, "zlib stream error"); - png_cleanup_needed = 1; - break; - - case Z_VERSION_ERROR: - png_warning(png_ptr, "zlib version error"); - png_cleanup_needed = 1; - break; - - default: png_warning(png_ptr, "Unknown zlib error"); - png_cleanup_needed = 1; - } - } - - if (png_cleanup_needed) - { - /* Clean up PNG structure and deallocate any memory. */ - png_free(png_ptr, png_ptr->zbuf); - png_ptr->zbuf = NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, - (png_free_ptr)free_fn, (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); #endif - return (NULL); - } - - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; + /* TODO: delay this, it can be done in png_init_io (if the app doesn't + * do it itself) avoiding setting the default function if it is not + * required. + */ png_set_read_fn(png_ptr, NULL, NULL); + } - - return (png_ptr); + return png_ptr; } #ifdef PNG_SEQUENTIAL_READ_SUPPORTED @@ -174,10 +88,14 @@ * here. The application can then have access to the signature bytes we * read if it is determined that this isn't a valid PNG file. */ void PNGAPI -png_read_info(png_structp png_ptr, png_infop info_ptr) +png_read_info(png_structrp png_ptr, png_inforp info_ptr) { +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + int keep; +#endif + png_debug(1, "in png_read_info"); if (png_ptr == NULL || info_ptr == NULL) return; @@ -189,42 +107,49 @@ { png_uint_32 length = png_read_chunk_header(png_ptr); png_uint_32 chunk_name = png_ptr->chunk_name; - /* This should be a binary subdivision search or a hash for - * matching the chunk name rather than a linear search. + /* IDAT logic needs to happen here to simplify getting the two flags + * right. */ if (chunk_name == png_IDAT) - if (png_ptr->mode & PNG_AFTER_IDAT) - png_ptr->mode |= PNG_HAVE_CHUNK_AFTER_IDAT; + { + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_chunk_error(png_ptr, "Missing IHDR before IDAT"); + + else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE)) + png_chunk_error(png_ptr, "Missing PLTE before IDAT"); + + else if (png_ptr->mode & PNG_AFTER_IDAT) + png_chunk_benign_error(png_ptr, "Too many IDATs found"); + + png_ptr->mode |= PNG_HAVE_IDAT; + } + + else if (png_ptr->mode & PNG_HAVE_IDAT) + png_ptr->mode |= PNG_AFTER_IDAT; + /* This should be a binary subdivision search or a hash for + * matching the chunk name rather than a linear search. + */ if (chunk_name == png_IHDR) png_handle_IHDR(png_ptr, info_ptr, length); else if (chunk_name == png_IEND) png_handle_IEND(png_ptr, info_ptr, length); #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_chunk_unknown_handling(png_ptr, chunk_name) != - PNG_HANDLE_CHUNK_AS_DEFAULT) + else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0) { - if (chunk_name == png_IDAT) - png_ptr->mode |= PNG_HAVE_IDAT; - - png_handle_unknown(png_ptr, info_ptr, length); + png_handle_unknown(png_ptr, info_ptr, length, keep); if (chunk_name == png_PLTE) png_ptr->mode |= PNG_HAVE_PLTE; else if (chunk_name == png_IDAT) { - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before IDAT"); - - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - png_error(png_ptr, "Missing PLTE before IDAT"); - + png_ptr->idat_size = 0; /* It has been consumed */ break; } } #endif @@ -232,17 +157,9 @@ png_handle_PLTE(png_ptr, info_ptr, length); else if (chunk_name == png_IDAT) { - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before IDAT"); - - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) - png_error(png_ptr, "Missing PLTE before IDAT"); - png_ptr->idat_size = length; - png_ptr->mode |= PNG_HAVE_IDAT; break; } #ifdef PNG_READ_bKGD_SUPPORTED @@ -330,22 +247,24 @@ png_handle_iTXt(png_ptr, info_ptr, length); #endif else - png_handle_unknown(png_ptr, info_ptr, length); + png_handle_unknown(png_ptr, info_ptr, length, + PNG_HANDLE_CHUNK_AS_DEFAULT); } } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ /* Optional call to update the users info_ptr structure */ void PNGAPI -png_read_update_info(png_structp png_ptr, png_infop info_ptr) +png_read_update_info(png_structrp png_ptr, png_inforp info_ptr) { png_debug(1, "in png_read_update_info"); - if (png_ptr == NULL) - return; - + if (png_ptr != NULL) + { + if ((png_ptr->flags & PNG_FLAG_ROW_INIT) == 0) + { png_read_start_row(png_ptr); #ifdef PNG_READ_TRANSFORMS_SUPPORTED png_read_transform_info(png_ptr, info_ptr); @@ -353,30 +272,43 @@ PNG_UNUSED(info_ptr) #endif } + /* New in 1.6.0 this avoids the bug of doing the initializations twice */ + else + png_app_error(png_ptr, + "png_read_update_info/png_start_read_image: duplicate call"); + } +} + #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Initialize palette, background, etc, after transformations * are set, but before any reading takes place. This allows * the user to obtain a gamma-corrected palette, for example. * If the user doesn't call this, we will do it ourselves. */ void PNGAPI -png_start_read_image(png_structp png_ptr) +png_start_read_image(png_structrp png_ptr) { png_debug(1, "in png_start_read_image"); if (png_ptr != NULL) + { + if ((png_ptr->flags & PNG_FLAG_ROW_INIT) == 0) png_read_start_row(png_ptr); + + /* New in 1.6.0 this avoids the bug of doing the initializations twice */ + else + png_app_error(png_ptr, + "png_start_read_image/png_read_update_info: duplicate call"); + } } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ #ifdef PNG_SEQUENTIAL_READ_SUPPORTED void PNGAPI -png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row) +png_read_row(png_structrp png_ptr, png_bytep row, png_bytep dsp_row) { - int ret; - png_row_info row_info; if (png_ptr == NULL) return; @@ -527,51 +460,10 @@ if (!(png_ptr->mode & PNG_HAVE_IDAT)) png_error(png_ptr, "Invalid attempt to read row data"); - png_ptr->zstream.next_out = png_ptr->row_buf; - png_ptr->zstream.avail_out = - (uInt)(PNG_ROWBYTES(png_ptr->pixel_depth, - png_ptr->iwidth) + 1); - - do - { - if (!(png_ptr->zstream.avail_in)) - { - while (!png_ptr->idat_size) - { - png_crc_finish(png_ptr, 0); - - png_ptr->idat_size = png_read_chunk_header(png_ptr); - if (png_ptr->chunk_name != png_IDAT) - png_error(png_ptr, "Not enough image data"); - } - png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_in = png_ptr->zbuf; - if (png_ptr->zbuf_size > png_ptr->idat_size) - png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; - png_crc_read(png_ptr, png_ptr->zbuf, - (png_size_t)png_ptr->zstream.avail_in); - png_ptr->idat_size -= png_ptr->zstream.avail_in; - } - - ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); - - if (ret == Z_STREAM_END) - { - if (png_ptr->zstream.avail_out || png_ptr->zstream.avail_in || - png_ptr->idat_size) - png_benign_error(png_ptr, "Extra compressed data"); - png_ptr->mode |= PNG_AFTER_IDAT; - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; - break; - } - - if (ret != Z_OK) - png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : - "Decompression error"); - - } while (png_ptr->zstream.avail_out); + /* Fill the row with IDAT data: */ + png_read_IDAT_data(png_ptr, png_ptr->row_buf, row_info.rowbytes + 1); if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE) { if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST) @@ -585,9 +477,9 @@ * 1.5.6, while the buffer really is this big in current versions of libpng * it may not be in the future, so this was changed just to copy the * interlaced count: */ - png_memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1); + memcpy(png_ptr->prev_row, png_ptr->row_buf, row_info.rowbytes + 1); #ifdef PNG_MNG_FEATURES_SUPPORTED if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) && (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING)) @@ -671,9 +564,9 @@ * [*] png_handle_alpha() does not exist yet, as of this version of libpng */ void PNGAPI -png_read_rows(png_structp png_ptr, png_bytepp row, +png_read_rows(png_structrp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows) { png_uint_32 i; png_bytepp rp; @@ -726,9 +619,9 @@ * * [*] png_handle_alpha() does not exist yet, as of this version of libpng */ void PNGAPI -png_read_image(png_structp png_ptr, png_bytepp image) +png_read_image(png_structrp png_ptr, png_bytepp image) { png_uint_32 i, image_height; int pass, j; png_bytepp rp; @@ -791,16 +684,26 @@ * file, will verify the end is accurate, and will read any comments * or time information at the end of the file, if info is not NULL. */ void PNGAPI -png_read_end(png_structp png_ptr, png_infop info_ptr) +png_read_end(png_structrp png_ptr, png_inforp info_ptr) { +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + int keep; +#endif + png_debug(1, "in png_read_end"); if (png_ptr == NULL) return; - png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */ + /* If png_read_end is called in the middle of reading the rows there may + * still be pending IDAT data and an owned zstream. Deal with this here. + */ +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED + if (!png_chunk_unknown_handling(png_ptr, png_IDAT)) +#endif + png_read_finish_IDAT(png_ptr); #ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED /* Report invalid palette index; added at libng-1.5.10 */ if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && @@ -819,17 +722,16 @@ else if (chunk_name == png_IEND) png_handle_IEND(png_ptr, info_ptr, length); #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - else if (png_chunk_unknown_handling(png_ptr, chunk_name) != - PNG_HANDLE_CHUNK_AS_DEFAULT) + else if ((keep = png_chunk_unknown_handling(png_ptr, chunk_name)) != 0) { if (chunk_name == png_IDAT) { if ((length > 0) || (png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT)) png_benign_error(png_ptr, "Too many IDATs found"); } - png_handle_unknown(png_ptr, info_ptr, length); + png_handle_unknown(png_ptr, info_ptr, length, keep); if (chunk_name == png_PLTE) png_ptr->mode |= PNG_HAVE_PLTE; } #endif @@ -932,119 +834,27 @@ png_handle_iTXt(png_ptr, info_ptr, length); #endif else - png_handle_unknown(png_ptr, info_ptr, length); + png_handle_unknown(png_ptr, info_ptr, length, + PNG_HANDLE_CHUNK_AS_DEFAULT); } while (!(png_ptr->mode & PNG_HAVE_IEND)); } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ -/* Free all memory used by the read */ -void PNGAPI -png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, - png_infopp end_info_ptr_ptr) -{ - png_structp png_ptr = NULL; - png_infop info_ptr = NULL, end_info_ptr = NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn = NULL; - png_voidp mem_ptr = NULL; -#endif - - png_debug(1, "in png_destroy_read_struct"); - - if (png_ptr_ptr != NULL) - png_ptr = *png_ptr_ptr; - if (png_ptr == NULL) - return; - -#ifdef PNG_USER_MEM_SUPPORTED - free_fn = png_ptr->free_fn; - mem_ptr = png_ptr->mem_ptr; -#endif - - if (info_ptr_ptr != NULL) - info_ptr = *info_ptr_ptr; - - if (end_info_ptr_ptr != NULL) - end_info_ptr = *end_info_ptr_ptr; - - png_read_destroy(png_ptr, info_ptr, end_info_ptr); - - if (info_ptr != NULL) - { -#ifdef PNG_TEXT_SUPPORTED - png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1); -#endif - -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)info_ptr); -#endif - *info_ptr_ptr = NULL; - } - - if (end_info_ptr != NULL) - { -#ifdef PNG_READ_TEXT_SUPPORTED - png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1); -#endif -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)end_info_ptr); -#endif - *end_info_ptr_ptr = NULL; - } - - if (png_ptr != NULL) +/* Free all memory used in the read struct */ +static void +png_read_destroy(png_structrp png_ptr) { -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); -#endif - *png_ptr_ptr = NULL; - } -} - -/* Free all memory used by the read (old method) */ -void /* PRIVATE */ -png_read_destroy(png_structp png_ptr, png_infop info_ptr, - png_infop end_info_ptr) -{ -#ifdef PNG_SETJMP_SUPPORTED - jmp_buf tmp_jmp; -#endif - png_error_ptr error_fn; -#ifdef PNG_WARNINGS_SUPPORTED - png_error_ptr warning_fn; -#endif - png_voidp error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn; -#endif - png_debug(1, "in png_read_destroy"); - if (info_ptr != NULL) - png_info_destroy(png_ptr, info_ptr); - - if (end_info_ptr != NULL) - png_info_destroy(png_ptr, end_info_ptr); - #ifdef PNG_READ_GAMMA_SUPPORTED png_destroy_gamma_table(png_ptr); #endif - png_free(png_ptr, png_ptr->zbuf); png_free(png_ptr, png_ptr->big_row_buf); png_free(png_ptr, png_ptr->big_prev_row); - png_free(png_ptr, png_ptr->chunkdata); + png_free(png_ptr, png_ptr->read_buffer); #ifdef PNG_READ_QUANTIZE_SUPPORTED png_free(png_ptr, png_ptr->palette_lookup); png_free(png_ptr, png_ptr->quantize_index); @@ -1060,55 +870,58 @@ png_free(png_ptr, png_ptr->trans_alpha); png_ptr->free_me &= ~PNG_FREE_TRNS; #endif -#ifdef PNG_READ_hIST_SUPPORTED - if (png_ptr->free_me & PNG_FREE_HIST) - png_free(png_ptr, png_ptr->hist); - png_ptr->free_me &= ~PNG_FREE_HIST; -#endif - inflateEnd(&png_ptr->zstream); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED png_free(png_ptr, png_ptr->save_buffer); #endif - /* Save the important info out of the png_struct, in case it is - * being used again. - */ -#ifdef PNG_SETJMP_SUPPORTED - png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); +#if (defined PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) &&\ + (defined PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) + png_free(png_ptr, png_ptr->unknown_chunk.data); #endif - error_fn = png_ptr->error_fn; -#ifdef PNG_WARNINGS_SUPPORTED - warning_fn = png_ptr->warning_fn; -#endif - error_ptr = png_ptr->error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - free_fn = png_ptr->free_fn; +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + png_free(png_ptr, png_ptr->chunk_list); #endif - png_memset(png_ptr, 0, png_sizeof(png_struct)); + /* NOTE: the 'setjmp' buffer may still be allocated and the memory and error + * callbacks are still set at this point. They are required to complete the + * destruction of the png_struct itself. + */ +} - png_ptr->error_fn = error_fn; -#ifdef PNG_WARNINGS_SUPPORTED - png_ptr->warning_fn = warning_fn; -#endif - png_ptr->error_ptr = error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - png_ptr->free_fn = free_fn; -#endif +/* Free all memory used by the read */ +void PNGAPI +png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, + png_infopp end_info_ptr_ptr) +{ + png_structrp png_ptr = NULL; -#ifdef PNG_SETJMP_SUPPORTED - png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf)); -#endif + png_debug(1, "in png_destroy_read_struct"); + + if (png_ptr_ptr != NULL) + png_ptr = *png_ptr_ptr; + if (png_ptr == NULL) + return; + + /* libpng 1.6.0: use the API to destroy info structs to ensure consistent + * behavior. Prior to 1.6.0 libpng did extra 'info' destruction in this API. + * The extra was, apparently, unnecessary yet this hides memory leak bugs. + */ + png_destroy_info_struct(png_ptr, end_info_ptr_ptr); + png_destroy_info_struct(png_ptr, info_ptr_ptr); + + *png_ptr_ptr = NULL; + png_read_destroy(png_ptr); + png_destroy_png_struct(png_ptr); } void PNGAPI -png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn) +png_set_read_status_fn(png_structrp png_ptr, png_read_status_ptr read_row_fn) { if (png_ptr == NULL) return; @@ -1118,9 +931,9 @@ #ifdef PNG_SEQUENTIAL_READ_SUPPORTED #ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI -png_read_png(png_structp png_ptr, png_infop info_ptr, +png_read_png(png_structrp png_ptr, png_inforp info_ptr, int transforms, voidp params) { int row; @@ -1131,9 +944,9 @@ /* png_read_info() gives us all of the information from the * PNG file before the first IDAT (image data chunk). */ png_read_info(png_ptr, info_ptr); - if (info_ptr->height > PNG_UINT_32_MAX/png_sizeof(png_bytep)) + if (info_ptr->height > PNG_UINT_32_MAX/(sizeof (png_bytep))) png_error(png_ptr, "Image is too high to process with png_read_png()"); /* -------------- image transformations start here ------------------- */ @@ -1278,9 +1091,9 @@ { png_uint_32 iptr; info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr, - info_ptr->height * png_sizeof(png_bytep)); + info_ptr->height * (sizeof (png_bytep))); for (iptr=0; iptrheight; iptr++) info_ptr->row_pointers[iptr] = NULL; info_ptr->free_me |= PNG_FREE_ROWS; @@ -1301,5 +1114,2864 @@ } #endif /* PNG_INFO_IMAGE_SUPPORTED */ #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ + +#ifdef PNG_SIMPLIFIED_READ_SUPPORTED +/* SIMPLIFIED READ + * + * This code currently relies on the sequential reader, though it could easily + * be made to work with the progressive one. + */ +/* Arguments to png_image_finish_read: */ + +/* Encoding of PNG data (used by the color-map code) */ +/* TODO: change these, dang, ANSI-C reserves the 'E' namespace. */ +# define E_NOTSET 0 /* File encoding not yet known */ +# define E_sRGB 1 /* 8-bit encoded to sRGB gamma */ +# define E_LINEAR 2 /* 16-bit linear: not encoded, NOT pre-multiplied! */ +# define E_FILE 3 /* 8-bit encoded to file gamma, not sRGB or linear */ +# define E_LINEAR8 4 /* 8-bit linear: only from a file value */ + +/* Color-map processing: after libpng has run on the PNG image further + * processing may be needed to conver the data to color-map indicies. + */ +#define PNG_CMAP_NONE 0 +#define PNG_CMAP_GA 1 /* Process GA data to a color-map with alpha */ +#define PNG_CMAP_TRANS 2 /* Process GA data to a background index */ +#define PNG_CMAP_RGB 3 /* Process RGB data */ +#define PNG_CMAP_RGB_ALPHA 4 /* Process RGBA data */ + +/* The following document where the background is for each processing case. */ +#define PNG_CMAP_NONE_BACKGROUND 256 +#define PNG_CMAP_GA_BACKGROUND 231 +#define PNG_CMAP_TRANS_BACKGROUND 254 +#define PNG_CMAP_RGB_BACKGROUND 256 +#define PNG_CMAP_RGB_ALPHA_BACKGROUND 216 + +typedef struct +{ + /* Arguments: */ + png_imagep image; + png_voidp buffer; + png_int_32 row_stride; + png_voidp colormap; + png_const_colorp background; + /* Local variables: */ + png_voidp local_row; + png_voidp first_row; + ptrdiff_t row_bytes; /* step between rows */ + int file_encoding; /* E_ values above */ + png_fixed_point gamma_to_linear; /* For E_FILE, reciprocal of gamma */ + int colormap_processing; /* PNG_CMAP_ values above */ +} png_image_read_control; + +/* Do all the *safe* initialization - 'safe' means that png_error won't be + * called, so setting up the jmp_buf is not required. This means that anything + * called from here must *not* call png_malloc - it has to call png_malloc_warn + * instead so that control is returned safely back to this routine. + */ +static int +png_image_read_init(png_imagep image) +{ + if (image->opaque == NULL) + { + png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, image, + png_safe_error, png_safe_warning); + + /* And set the rest of the structure to NULL to ensure that the various + * fields are consistent. + */ + memset(image, 0, (sizeof *image)); + image->version = PNG_IMAGE_VERSION; + + if (png_ptr != NULL) + { + png_infop info_ptr = png_create_info_struct(png_ptr); + + if (info_ptr != NULL) + { + png_controlp control = png_voidcast(png_controlp, + png_malloc_warn(png_ptr, (sizeof *control))); + + if (control != NULL) + { + memset(control, 0, (sizeof *control)); + + control->png_ptr = png_ptr; + control->info_ptr = info_ptr; + control->for_write = 0; + + image->opaque = control; + return 1; + } + + /* Error clean up */ + png_destroy_info_struct(png_ptr, &info_ptr); + } + + png_destroy_read_struct(&png_ptr, NULL, NULL); + } + + return png_image_error(image, "png_image_read: out of memory"); + } + + return png_image_error(image, "png_image_read: opaque pointer not NULL"); +} + +/* Utility to find the base format of a PNG file from a png_struct. */ +static png_uint_32 +png_image_format(png_structrp png_ptr) +{ + png_uint_32 format = 0; + + if (png_ptr->color_type & PNG_COLOR_MASK_COLOR) + format |= PNG_FORMAT_FLAG_COLOR; + + if (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) + format |= PNG_FORMAT_FLAG_ALPHA; + + /* Use png_ptr here, not info_ptr, because by examination png_handle_tRNS + * sets the png_struct fields; that's all we are interested in here. The + * precise interaction with an app call to png_set_tRNS and PNG file reading + * is unclear. + */ + else if (png_ptr->num_trans > 0) + format |= PNG_FORMAT_FLAG_ALPHA; + + if (png_ptr->bit_depth == 16) + format |= PNG_FORMAT_FLAG_LINEAR; + + if (png_ptr->color_type & PNG_COLOR_MASK_PALETTE) + format |= PNG_FORMAT_FLAG_COLORMAP; + + return format; +} + +/* Is the given gamma significantly different from sRGB? The test is the same + * one used in pngrtran.c when deciding whether to do gamma correction. The + * arithmetic optimizes the division by using the fact that the inverse of the + * file sRGB gamma is 2.2 + */ +static int +png_gamma_not_sRGB(png_fixed_point g) +{ + if (g < PNG_FP_1) + { + /* An uninitialized gamma is assumed to be sRGB for the simplified API. */ + if (g == 0) + return 0; + + return png_gamma_significant((g * 11 + 2)/5 /* i.e. *2.2, rounded */); + } + + return 1; +} + +/* Do the main body of a 'png_image_begin_read' function; read the PNG file + * header and fill in all the information. This is executed in a safe context, + * unlike the init routine above. + */ +static int +png_image_read_header(png_voidp argument) +{ + png_imagep image = png_voidcast(png_imagep, argument); + png_structrp png_ptr = image->opaque->png_ptr; + png_inforp info_ptr = image->opaque->info_ptr; + + png_set_benign_errors(png_ptr, 1/*warn*/); + png_read_info(png_ptr, info_ptr); + + /* Do this the fast way; just read directly out of png_struct. */ + image->width = png_ptr->width; + image->height = png_ptr->height; + + { + png_uint_32 format = png_image_format(png_ptr); + + image->format = format; + +#ifdef PNG_COLORSPACE_SUPPORTED + /* Does the colorspace match sRGB? If there is no color endpoint + * (colorant) information assume yes, otherwise require the + * 'ENDPOINTS_MATCHE_sRGB' colorspace flag to have been set. If the + * colorspace has been determined to be invalid ignore it. + */ + if ((format & PNG_FORMAT_FLAG_COLOR) != 0 && ((png_ptr->colorspace.flags + & (PNG_COLORSPACE_HAVE_ENDPOINTS|PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB| + PNG_COLORSPACE_INVALID)) == PNG_COLORSPACE_HAVE_ENDPOINTS)) + image->flags |= PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB; +#endif + } + + /* We need the maximum number of entries regardless of the format the + * application sets here. + */ + { + png_uint_32 cmap_entries; + + switch (png_ptr->color_type) + { + case PNG_COLOR_TYPE_GRAY: + cmap_entries = 1U << png_ptr->bit_depth; + break; + + case PNG_COLOR_TYPE_PALETTE: + cmap_entries = png_ptr->num_palette; + break; + + default: + cmap_entries = 256; + break; + } + + if (cmap_entries > 256) + cmap_entries = 256; + + image->colormap_entries = cmap_entries; + } + + return 1; +} + +#ifdef PNG_STDIO_SUPPORTED +int PNGAPI +png_image_begin_read_from_stdio(png_imagep image, FILE* file) +{ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (file != NULL) + { + if (png_image_read_init(image)) + { + /* This is slightly evil, but png_init_io doesn't do anything other + * than this and we haven't changed the standard IO functions so + * this saves a 'safe' function. + */ + image->opaque->png_ptr->io_ptr = file; + return png_safe_execute(image, png_image_read_header, image); + } + } + + else + return png_image_error(image, + "png_image_begin_read_from_stdio: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_begin_read_from_stdio: incorrect PNG_IMAGE_VERSION"); + + return 0; +} + +int PNGAPI +png_image_begin_read_from_file(png_imagep image, const char *file_name) +{ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (file_name != NULL) + { + FILE *fp = fopen(file_name, "rb"); + + if (fp != NULL) + { + if (png_image_read_init(image)) + { + image->opaque->png_ptr->io_ptr = fp; + image->opaque->owned_file = 1; + return png_safe_execute(image, png_image_read_header, image); + } + + /* Clean up: just the opened file. */ + (void)fclose(fp); + } + + else + return png_image_error(image, strerror(errno)); + } + + else + return png_image_error(image, + "png_image_begin_read_from_file: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_begin_read_from_file: incorrect PNG_IMAGE_VERSION"); + + return 0; +} +#endif /* PNG_STDIO_SUPPORTED */ + +static void PNGCBAPI +png_image_memory_read(png_structp png_ptr, png_bytep out, png_size_t need) +{ + if (png_ptr != NULL) + { + png_imagep image = png_voidcast(png_imagep, png_ptr->io_ptr); + if (image != NULL) + { + png_controlp cp = image->opaque; + if (cp != NULL) + { + png_const_bytep memory = cp->memory; + png_size_t size = cp->size; + + if (memory != NULL && size >= need) + { + memcpy(out, memory, need); + cp->memory = memory + need; + cp->size = size - need; + return; + } + + png_error(png_ptr, "read beyond end of data"); + } + } + + png_error(png_ptr, "invalid memory read"); + } +} + +int PNGAPI png_image_begin_read_from_memory(png_imagep image, + png_const_voidp memory, png_size_t size) +{ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (memory != NULL && size > 0) + { + if (png_image_read_init(image)) + { + /* Now set the IO functions to read from the memory buffer and + * store it into io_ptr. Again do this in-place to avoid calling a + * libpng function that requires error handling. + */ + image->opaque->memory = png_voidcast(png_const_bytep, memory); + image->opaque->size = size; + image->opaque->png_ptr->io_ptr = image; + image->opaque->png_ptr->read_data_fn = png_image_memory_read; + + return png_safe_execute(image, png_image_read_header, image); + } + } + + else + return png_image_error(image, + "png_image_begin_read_from_memory: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_begin_read_from_memory: incorrect PNG_IMAGE_VERSION"); + + return 0; +} + +/* Utility function to skip chunks that are not used by the simplified image + * read functions and an appropriate macro to call it. + */ +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +static void +png_image_skip_unused_chunks(png_structrp png_ptr) +{ + /* Prepare the reader to ignore all recognized chunks whose data will not + * be used, i.e., all chunks recognized by libpng except for those + * involved in basic image reading: + * + * IHDR, PLTE, IDAT, IEND + * + * Or image data handling: + * + * tRNS, bKGD, gAMA, cHRM, sRGB, iCCP and sBIT. + * + * This provides a small performance improvement and eliminates any + * potential vulnerability to security problems in the unused chunks. + */ + { + static PNG_CONST png_byte chunks_to_process[] = { + 98, 75, 71, 68, '\0', /* bKGD */ + 99, 72, 82, 77, '\0', /* cHRM */ + 103, 65, 77, 65, '\0', /* gAMA */ + 105, 67, 67, 80, '\0', /* iCCP */ + 115, 66, 73, 84, '\0', /* sBIT */ + 115, 82, 71, 66, '\0', /* sRGB */ + }; + + /* Ignore unknown chunks and all other chunks except for the + * IHDR, PLTE, tRNS, IDAT, and IEND chunks. + */ + png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_NEVER, + NULL, -1); + + /* But do not ignore image data handling chunks */ + png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_AS_DEFAULT, + chunks_to_process, (sizeof chunks_to_process)/5); + } +} + +# define PNG_SKIP_CHUNKS(p) png_image_skip_unused_chunks(p) +#else +# define PNG_SKIP_CHUNKS(p) ((void)0) +#endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */ + +/* The following macro gives the exact rounded answer for all values in the + * range 0..255 (it actually divides by 51.2, but the rounding still generates + * the correct numbers 0..5 + */ +#define PNG_DIV51(v8) (((v8) * 5 + 130) >> 8) + +/* Utility functions to make particular color-maps */ +static void +set_file_encoding(png_image_read_control *display) +{ + png_fixed_point g = display->image->opaque->png_ptr->colorspace.gamma; + if (png_gamma_significant(g)) + { + if (png_gamma_not_sRGB(g)) + { + display->file_encoding = E_FILE; + display->gamma_to_linear = png_reciprocal(g); + } + + else + display->file_encoding = E_sRGB; + } + + else + display->file_encoding = E_LINEAR8; +} + +static unsigned int +decode_gamma(png_image_read_control *display, png_uint_32 value, int encoding) +{ + if (encoding == E_FILE) /* double check */ + encoding = display->file_encoding; + + if (encoding == E_NOTSET) /* must be the file encoding */ + { + set_file_encoding(display); + encoding = display->file_encoding; + } + + switch (encoding) + { + case E_FILE: + value = png_gamma_16bit_correct(value*257, display->gamma_to_linear); + break; + + case E_sRGB: + value = png_sRGB_table[value]; + break; + + case E_LINEAR: + break; + + case E_LINEAR8: + value *= 257; + break; + + default: + png_error(display->image->opaque->png_ptr, + "unexpected encoding (internal error)"); + break; + } + + return value; +} + +static png_uint_32 +png_colormap_compose(png_image_read_control *display, + png_uint_32 foreground, int foreground_encoding, png_uint_32 alpha, + png_uint_32 background, int encoding) +{ + /* The file value is composed on the background, the background has the given + * encoding and so does the result, the file is encoded with E_FILE and the + * file and alpha are 8-bit values. The (output) encoding will always be + * E_LINEAR or E_sRGB. + */ + png_uint_32 f = decode_gamma(display, foreground, foreground_encoding); + png_uint_32 b = decode_gamma(display, background, encoding); + + /* The alpha is always an 8-bit value (it comes from the palette), the value + * scaled by 255 is what PNG_sRGB_FROM_LINEAR requires. + */ + f = f * alpha + b * (255-alpha); + + if (encoding == E_LINEAR) + { + /* Scale to 65535; divide by 255, approximately (in fact this is extremely + * accurate, it divides by 255.00000005937181414556, with no overflow.) + */ + f *= 257; /* Now scaled by 65535 */ + f += f >> 16; + f = (f+32768) >> 16; + } + + else /* E_sRGB */ + f = PNG_sRGB_FROM_LINEAR(f); + + return f; +} + +/* NOTE: E_LINEAR values to this routine must be 16-bit, but E_FILE values must + * be 8-bit. + */ +static void +png_create_colormap_entry(png_image_read_control *display, + png_uint_32 ip, png_uint_32 red, png_uint_32 green, png_uint_32 blue, + png_uint_32 alpha, int encoding) +{ + png_imagep image = display->image; + const int output_encoding = (image->format & PNG_FORMAT_FLAG_LINEAR) ? + E_LINEAR : E_sRGB; + const int convert_to_Y = (image->format & PNG_FORMAT_FLAG_COLOR) == 0 && + (red != green || green != blue); + + if (ip > 255) + png_error(image->opaque->png_ptr, "color-map index out of range"); + + /* Update the cache with whether the file gamma is significantly different + * from sRGB. + */ + if (encoding == E_FILE) + { + if (display->file_encoding == E_NOTSET) + set_file_encoding(display); + + /* Note that the cached value may be E_FILE too, but if it is then the + * gamma_to_linear member has been set. + */ + encoding = display->file_encoding; + } + + if (encoding == E_FILE) + { + png_fixed_point g = display->gamma_to_linear; + + red = png_gamma_16bit_correct(red*257, g); + green = png_gamma_16bit_correct(green*257, g); + blue = png_gamma_16bit_correct(blue*257, g); + + if (convert_to_Y || output_encoding == E_LINEAR) + { + alpha *= 257; + encoding = E_LINEAR; + } + + else + { + red = PNG_sRGB_FROM_LINEAR(red * 255); + green = PNG_sRGB_FROM_LINEAR(green * 255); + blue = PNG_sRGB_FROM_LINEAR(blue * 255); + encoding = E_sRGB; + } + } + + else if (encoding == E_LINEAR8) + { + /* This encoding occurs quite frequently in test cases because PngSuite + * includes a gAMA 1.0 chunk with most images. + */ + red *= 257; + green *= 257; + blue *= 257; + alpha *= 257; + encoding = E_LINEAR; + } + + else if (encoding == E_sRGB && (convert_to_Y || output_encoding == E_LINEAR)) + { + /* The values are 8-bit sRGB values, but must be converted to 16-bit + * linear. + */ + red = png_sRGB_table[red]; + green = png_sRGB_table[green]; + blue = png_sRGB_table[blue]; + alpha *= 257; + encoding = E_LINEAR; + } + + /* This is set if the color isn't gray but the output is. */ + if (encoding == E_LINEAR) + { + if (convert_to_Y) + { + /* NOTE: these values are copied from png_do_rgb_to_gray */ + png_uint_32 y = (png_uint_32)6968 * red + (png_uint_32)23434 * green + + (png_uint_32)2366 * blue; + + if (output_encoding == E_LINEAR) + y = (y + 16384) >> 15; + + else + { + /* y is scaled by 32768, we need it scaled by 255: */ + y = (y + 128) >> 8; + y *= 255; + y = PNG_sRGB_FROM_LINEAR((y + 64) >> 7); + encoding = E_sRGB; + } + + blue = red = green = y; + } + + else if (output_encoding == E_sRGB) + { + red = PNG_sRGB_FROM_LINEAR(red * 255); + green = PNG_sRGB_FROM_LINEAR(green * 255); + blue = PNG_sRGB_FROM_LINEAR(blue * 255); + alpha = PNG_DIV257(alpha); + encoding = E_sRGB; + } + } + + if (encoding != output_encoding) + png_error(image->opaque->png_ptr, "bad encoding (internal error)"); + + /* Store the value. */ + { +# ifdef PNG_FORMAT_BGR_SUPPORTED + const int afirst = (image->format & PNG_FORMAT_FLAG_AFIRST) != 0 && + (image->format & PNG_FORMAT_FLAG_ALPHA) != 0; +# else +# define afirst 0 +# endif +# ifdef PNG_FORMAT_BGR_SUPPORTED + const int bgr = (image->format & PNG_FORMAT_FLAG_BGR) ? 2 : 0; +# else +# define bgr 0 +# endif + + if (output_encoding == E_LINEAR) + { + png_uint_16p entry = png_voidcast(png_uint_16p, display->colormap); + + entry += ip * PNG_IMAGE_SAMPLE_CHANNELS(image->format); + + /* The linear 16-bit values must be pre-multiplied by the alpha channel + * value, if less than 65535 (this is, effectively, composite on black + * if the alpha channel is removed.) + */ + switch (PNG_IMAGE_SAMPLE_CHANNELS(image->format)) + { + case 4: + entry[afirst ? 0 : 3] = (png_uint_16)alpha; + /* FALL THROUGH */ + + case 3: + if (alpha < 65535) + { + if (alpha > 0) + { + blue = (blue * alpha + 32767U)/65535U; + green = (green * alpha + 32767U)/65535U; + red = (red * alpha + 32767U)/65535U; + } + + else + red = green = blue = 0; + } + entry[afirst + (2 ^ bgr)] = (png_uint_16)blue; + entry[afirst + 1] = (png_uint_16)green; + entry[afirst + bgr] = (png_uint_16)red; + break; + + case 2: + entry[1 ^ afirst] = (png_uint_16)alpha; + /* FALL THROUGH */ + + case 1: + if (alpha < 65535) + { + if (alpha > 0) + green = (green * alpha + 32767U)/65535U; + + else + green = 0; + } + entry[afirst] = (png_uint_16)green; + break; + + default: + break; + } + } + + else /* output encoding is E_sRGB */ + { + png_bytep entry = png_voidcast(png_bytep, display->colormap); + + entry += ip * PNG_IMAGE_SAMPLE_CHANNELS(image->format); + + switch (PNG_IMAGE_SAMPLE_CHANNELS(image->format)) + { + case 4: + entry[afirst ? 0 : 3] = (png_byte)alpha; + case 3: + entry[afirst + (2 ^ bgr)] = (png_byte)blue; + entry[afirst + 1] = (png_byte)green; + entry[afirst + bgr] = (png_byte)red; + break; + + case 2: + entry[1 ^ afirst] = (png_byte)alpha; + case 1: + entry[afirst] = (png_byte)green; + break; + + default: + break; + } + } + +# ifdef afirst +# undef afirst +# endif +# ifdef bgr +# undef bgr +# endif + } +} + +static int +make_gray_file_colormap(png_image_read_control *display) +{ + unsigned int i; + + for (i=0; i<256; ++i) + png_create_colormap_entry(display, i, i, i, i, 255, E_FILE); + + return i; +} + +static int +make_gray_colormap(png_image_read_control *display) +{ + unsigned int i; + + for (i=0; i<256; ++i) + png_create_colormap_entry(display, i, i, i, i, 255, E_sRGB); + + return i; +} +#define PNG_GRAY_COLORMAP_ENTRIES 256 + +static int +make_ga_colormap(png_image_read_control *display) +{ + unsigned int i, a; + + /* Alpha is retained, the output will be a color-map with entries + * selected by six levels of alpha. One transparent entry, 6 gray + * levels for all the intermediate alpha values, leaving 230 entries + * for the opaque grays. The color-map entries are the six values + * [0..5]*51, the GA processing uses PNG_DIV51(value) to find the + * relevant entry. + * + * if (alpha > 229) // opaque + * { + * // The 231 entries are selected to make the math below work: + * base = 0; + * entry = (231 * gray + 128) >> 8; + * } + * else if (alpha < 26) // transparent + * { + * base = 231; + * entry = 0; + * } + * else // partially opaque + * { + * base = 226 + 6 * PNG_DIV51(alpha); + * entry = PNG_DIV51(gray); + * } + */ + i = 0; + while (i < 231) + { + unsigned int gray = (i * 256 + 115) / 231; + png_create_colormap_entry(display, i++, gray, gray, gray, 255, E_sRGB); + } + + /* 255 is used here for the component values for consistency with the code + * that undoes premultiplication in pngwrite.c. + */ + png_create_colormap_entry(display, i++, 255, 255, 255, 0, E_sRGB); + + for (a=1; a<5; ++a) + { + unsigned int g; + + for (g=0; g<6; ++g) + png_create_colormap_entry(display, i++, g*51, g*51, g*51, a*51, + E_sRGB); + } + + return i; +} + +#define PNG_GA_COLORMAP_ENTRIES 256 + +static int +make_rgb_colormap(png_image_read_control *display) +{ + unsigned int i, r; + + /* Build a 6x6x6 opaque RGB cube */ + for (i=r=0; r<6; ++r) + { + unsigned int g; + + for (g=0; g<6; ++g) + { + unsigned int b; + + for (b=0; b<6; ++b) + png_create_colormap_entry(display, i++, r*51, g*51, b*51, 255, + E_sRGB); + } + } + + return i; +} + +#define PNG_RGB_COLORMAP_ENTRIES 216 + +/* Return a palette index to the above palette given three 8-bit sRGB values. */ +#define PNG_RGB_INDEX(r,g,b) \ + ((png_byte)(6 * (6 * PNG_DIV51(r) + PNG_DIV51(g)) + PNG_DIV51(b))) + +static int +png_image_read_colormap(png_voidp argument) +{ + png_image_read_control *display = + png_voidcast(png_image_read_control*, argument); + const png_imagep image = display->image; + + const png_structrp png_ptr = image->opaque->png_ptr; + const png_uint_32 output_format = image->format; + const int output_encoding = (output_format & PNG_FORMAT_FLAG_LINEAR) ? + E_LINEAR : E_sRGB; + + unsigned int cmap_entries; + unsigned int output_processing; /* Output processing option */ + unsigned int data_encoding = E_NOTSET; /* Encoding libpng must produce */ + + /* Background information; the background color and the index of this color + * in the color-map if it exists (else 256). + */ + unsigned int background_index = 256; + png_uint_32 back_r, back_g, back_b; + + /* Flags to accumulate things that need to be done to the input. */ + int expand_tRNS = 0; + + /* Exclude the NYI feature of compositing onto a color-mapped buffer; it is + * very difficult to do, the results look awful, and it is difficult to see + * what possible use it is because the application can't control the + * color-map. + */ + if (((png_ptr->color_type & PNG_COLOR_MASK_ALPHA) != 0 || + png_ptr->num_trans > 0) /* alpha in input */ && + ((output_format & PNG_FORMAT_FLAG_ALPHA) == 0) /* no alpha in output */) + { + if (output_encoding == E_LINEAR) /* compose on black */ + back_b = back_g = back_r = 0; + + else if (display->background == NULL /* no way to remove it */) + png_error(png_ptr, + "a background color must be supplied to remove alpha/transparency"); + + /* Get a copy of the background color (this avoids repeating the checks + * below.) The encoding is 8-bit sRGB or 16-bit linear, depending on the + * output format. + */ + else + { + back_g = display->background->green; + if (output_format & PNG_FORMAT_FLAG_COLOR) + { + back_r = display->background->red; + back_b = display->background->blue; + } + else + back_b = back_r = back_g; + } + } + + else if (output_encoding == E_LINEAR) + back_b = back_r = back_g = 65535; + + else + back_b = back_r = back_g = 255; + + /* Decide what to do based on the PNG color type of the input data. The + * utility function png_create_colormap_entry deals with most aspects of the + * output transformations; this code works out how to produce bytes of + * color-map entries from the original format. + */ + switch (png_ptr->color_type) + { + case PNG_COLOR_TYPE_GRAY: + if (png_ptr->bit_depth <= 8) + { + /* There at most 256 colors in the output, regardless of + * transparency. + */ + unsigned int step, i, val, trans = 256/*ignore*/, back_alpha = 0; + + cmap_entries = 1U << png_ptr->bit_depth; + if (cmap_entries > image->colormap_entries) + png_error(png_ptr, "gray[8] color-map: too few entries"); + + step = 255 / (cmap_entries - 1); + output_processing = PNG_CMAP_NONE; + + /* If there is a tRNS chunk then this either selects a transparent + * value or, if the output has no alpha, the background color. + */ + if (png_ptr->num_trans > 0) + { + trans = png_ptr->trans_color.gray; + + if ((output_format & PNG_FORMAT_FLAG_ALPHA) == 0) + back_alpha = output_encoding == E_LINEAR ? 65535 : 255; + } + + /* png_create_colormap_entry just takes an RGBA and writes the + * corresponding color-map entry using the format from 'image', + * including the required conversion to sRGB or linear as + * appropriate. The input values are always either sRGB (if the + * gamma correction flag is 0) or 0..255 scaled file encoded values + * (if the function must gamma correct them). + */ + for (i=val=0; ibit_depth < 8) + png_set_packing(png_ptr); + } + + else /* bit depth is 16 */ + { + /* The 16-bit input values can be converted directly to 8-bit gamma + * encoded values; however, if a tRNS chunk is present 257 color-map + * entries are required. This means that the extra entry requires + * special processing; add an alpha channel, sacrifice gray level + * 254 and convert transparent (alpha==0) entries to that. + * + * Use libpng to chop the data to 8 bits. Convert it to sRGB at the + * same time to minimize quality loss. If a tRNS chunk is present + * this means libpng must handle it too; otherwise it is impossible + * to do the exact match on the 16-bit value. + * + * If the output has no alpha channel *and* the background color is + * gray then it is possible to let libpng handle the substitution by + * ensuring that the corresponding gray level matches the background + * color exactly. + */ + data_encoding = E_sRGB; + + if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "gray[16] color-map: too few entries"); + + cmap_entries = make_gray_colormap(display); + + if (png_ptr->num_trans > 0) + { + unsigned int back_alpha; + + if (output_format & PNG_FORMAT_FLAG_ALPHA) + back_alpha = 0; + + else + { + if (back_r == back_g && back_g == back_b) + { + /* Background is gray; no special processing will be + * required. + */ + png_color_16 c; + png_uint_32 gray = back_g; + + if (output_encoding == E_LINEAR) + { + gray = PNG_sRGB_FROM_LINEAR(gray * 255); + + /* And make sure the corresponding palette entry + * matches. + */ + png_create_colormap_entry(display, gray, back_g, back_g, + back_g, 65535, E_LINEAR); + } + + /* The background passed to libpng, however, must be the + * sRGB value. + */ + c.index = 0; /*unused*/ + c.gray = c.red = c.green = c.blue = (png_uint_16)gray; + + /* NOTE: does this work without expanding tRNS to alpha? + * It should be the color->gray case below apparently + * doesn't. + */ + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + + output_processing = PNG_CMAP_NONE; + break; + } + + back_alpha = output_encoding == E_LINEAR ? 65535 : 255; + } + + /* output_processing means that the libpng-processed row will be + * 8-bit GA and it has to be processing to single byte color-map + * values. Entry 254 is replaced by either a completely + * transparent entry or by the background color at full + * precision (and the background color is not a simple gray leve + * in this case.) + */ + expand_tRNS = 1; + output_processing = PNG_CMAP_TRANS; + background_index = 254; + + /* And set (overwrite) color-map entry 254 to the actual + * background color at full precision. + */ + png_create_colormap_entry(display, 254, back_r, back_g, back_b, + back_alpha, output_encoding); + } + + else + output_processing = PNG_CMAP_NONE; + } + break; + + case PNG_COLOR_TYPE_GRAY_ALPHA: + /* 8-bit or 16-bit PNG with two channels - gray and alpha. A minimum + * of 65536 combinations. If, however, the alpha channel is to be + * removed there are only 256 possibilities if the background is gray. + * (Otherwise there is a subset of the 65536 possibilities defined by + * the triangle between black, white and the background color.) + * + * Reduce 16-bit files to 8-bit and sRGB encode the result. No need to + * worry about tRNS matching - tRNS is ignored if there is an alpha + * channel. + */ + data_encoding = E_sRGB; + + if (output_format & PNG_FORMAT_FLAG_ALPHA) + { + if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "gray+alpha color-map: too few entries"); + + cmap_entries = make_ga_colormap(display); + + background_index = PNG_CMAP_GA_BACKGROUND; + output_processing = PNG_CMAP_GA; + } + + else /* alpha is removed */ + { + /* Alpha must be removed as the PNG data is processed when the + * background is a color because the G and A channels are + * independent and the vector addition (non-parallel vectors) is a + * 2-D problem. + * + * This can be reduced to the same algorithm as above by making a + * colormap containing gray levels (for the opaque grays), a + * background entry (for a transparent pixel) and a set of four six + * level color values, one set for each intermediate alpha value. + * See the comments in make_ga_colormap for how this works in the + * per-pixel processing. + * + * If the background is gray, however, we only need a 256 entry gray + * level color map. It is sufficient to make the entry generated + * for the background color be exactly the color specified. + */ + if ((output_format & PNG_FORMAT_FLAG_COLOR) == 0 || + (back_r == back_g && back_g == back_b)) + { + /* Background is gray; no special processing will be required. */ + png_color_16 c; + png_uint_32 gray = back_g; + + if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "gray-alpha color-map: too few entries"); + + cmap_entries = make_gray_colormap(display); + + if (output_encoding == E_LINEAR) + { + gray = PNG_sRGB_FROM_LINEAR(gray * 255); + + /* And make sure the corresponding palette entry matches. */ + png_create_colormap_entry(display, gray, back_g, back_g, + back_g, 65535, E_LINEAR); + } + + /* The background passed to libpng, however, must be the sRGB + * value. + */ + c.index = 0; /*unused*/ + c.gray = c.red = c.green = c.blue = (png_uint_16)gray; + + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + + output_processing = PNG_CMAP_NONE; + } + + else + { + png_uint_32 i, a; + + /* This is the same as png_make_ga_colormap, above, except that + * the entries are all opaque. + */ + if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "ga-alpha color-map: too few entries"); + + i = 0; + while (i < 231) + { + png_uint_32 gray = (i * 256 + 115) / 231; + png_create_colormap_entry(display, i++, gray, gray, gray, + 255, E_sRGB); + } + + /* NOTE: this preserves the full precision of the application + * background color. + */ + background_index = i; + png_create_colormap_entry(display, i++, back_r, back_g, back_b, + output_encoding == E_LINEAR ? 65535U : 255U, output_encoding); + + /* For non-opaque input composite on the sRGB background - this + * requires inverting the encoding for each component. The input + * is still converted to the sRGB encoding because this is a + * reasonable approximate to the logarithmic curve of human + * visual sensitivity, at least over the narrow range which PNG + * represents. Consequently 'G' is always sRGB encoded, while + * 'A' is linear. We need the linear background colors. + */ + if (output_encoding == E_sRGB) /* else already linear */ + { + /* This may produce a value not exactly matching the + * background, but that's ok because these numbers are only + * used when alpha != 0 + */ + back_r = png_sRGB_table[back_r]; + back_g = png_sRGB_table[back_g]; + back_b = png_sRGB_table[back_b]; + } + + for (a=1; a<5; ++a) + { + unsigned int g; + + /* PNG_sRGB_FROM_LINEAR expects a 16-bit linear value scaled + * by an 8-bit alpha value (0..255). + */ + png_uint_32 alpha = 51 * a; + png_uint_32 back_rx = (255-alpha) * back_r; + png_uint_32 back_gx = (255-alpha) * back_g; + png_uint_32 back_bx = (255-alpha) * back_b; + + for (g=0; g<6; ++g) + { + png_uint_32 gray = png_sRGB_table[g*51] * alpha; + + png_create_colormap_entry(display, i++, + PNG_sRGB_FROM_LINEAR(gray + back_rx), + PNG_sRGB_FROM_LINEAR(gray + back_gx), + PNG_sRGB_FROM_LINEAR(gray + back_bx), 255, E_sRGB); + } + } + + cmap_entries = i; + output_processing = PNG_CMAP_GA; + } + } + break; + + case PNG_COLOR_TYPE_RGB: + case PNG_COLOR_TYPE_RGB_ALPHA: + /* Exclude the case where the output is gray; we can always handle this + * with the cases above. + */ + if ((output_format & PNG_FORMAT_FLAG_COLOR) == 0) + { + /* The color-map will be grayscale, so we may as well convert the + * input RGB values to a simple grayscale and use the grayscale + * code above. + * + * NOTE: calling this apparently damages the recognition of the + * transparent color in background color handling; call + * png_set_tRNS_to_alpha before png_set_background_fixed. + */ + png_set_rgb_to_gray_fixed(png_ptr, PNG_ERROR_ACTION_NONE, -1, + -1); + data_encoding = E_sRGB; + + /* The output will now be one or two 8-bit gray or gray+alpha + * channels. The more complex case arises when the input has alpha. + */ + if ((png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->num_trans > 0) && + (output_format & PNG_FORMAT_FLAG_ALPHA) != 0) + { + /* Both input and output have an alpha channel, so no background + * processing is required; just map the GA bytes to the right + * color-map entry. + */ + expand_tRNS = 1; + + if (PNG_GA_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "rgb[ga] color-map: too few entries"); + + cmap_entries = make_ga_colormap(display); + background_index = PNG_CMAP_GA_BACKGROUND; + output_processing = PNG_CMAP_GA; + } + + else + { + /* Either the input or the output has no alpha channel, so there + * will be no non-opaque pixels in the color-map; it will just be + * grayscale. + */ + if (PNG_GRAY_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "rgb[gray] color-map: too few entries"); + + /* Ideally this code would use libpng to do the gamma correction, + * but if an input alpha channel is to be removed we will hit the + * libpng bug in gamma+compose+rgb-to-gray (the double gamma + * correction bug). Fix this by dropping the gamma correction in + * this case and doing it in the palette; this will result in + * duplicate palette entries, but that's better than the + * alternative of double gamma correction. + */ + if ((png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->num_trans > 0) && + png_gamma_not_sRGB(png_ptr->colorspace.gamma)) + { + cmap_entries = make_gray_file_colormap(display); + data_encoding = E_FILE; + } + + else + cmap_entries = make_gray_colormap(display); + + /* But if the input has alpha or transparency it must be removed + */ + if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->num_trans > 0) + { + png_color_16 c; + png_uint_32 gray = back_g; + + /* We need to ensure that the application background exists in + * the colormap and that completely transparent pixels map to + * it. Achieve this simply by ensuring that the entry + * selected for the background really is the background color. + */ + if (data_encoding == E_FILE) /* from the fixup above */ + { + /* The app supplied a gray which is in output_encoding, we + * need to convert it to a value of the input (E_FILE) + * encoding then set this palette entry to the required + * output encoding. + */ + if (output_encoding == E_sRGB) + gray = png_sRGB_table[gray]; /* now E_LINEAR */ + + gray = PNG_DIV257(png_gamma_16bit_correct(gray, + png_ptr->colorspace.gamma)); /* now E_FILE */ + + /* And make sure the corresponding palette entry contains + * exactly the required sRGB value. + */ + png_create_colormap_entry(display, gray, back_g, back_g, + back_g, 0/*unused*/, output_encoding); + } + + else if (output_encoding == E_LINEAR) + { + gray = PNG_sRGB_FROM_LINEAR(gray * 255); + + /* And make sure the corresponding palette entry matches. + */ + png_create_colormap_entry(display, gray, back_g, back_g, + back_g, 0/*unused*/, E_LINEAR); + } + + /* The background passed to libpng, however, must be the + * output (normally sRGB) value. + */ + c.index = 0; /*unused*/ + c.gray = c.red = c.green = c.blue = (png_uint_16)gray; + + /* NOTE: the following is apparently a bug in libpng. Without + * it the transparent color recognition in + * png_set_background_fixed seems to go wrong. + */ + expand_tRNS = 1; + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + } + + output_processing = PNG_CMAP_NONE; + } + } + + else /* output is color */ + { + /* We could use png_quantize here so long as there is no transparent + * color or alpha; png_quantize ignores alpha. Easier overall just + * to do it once and using PNG_DIV51 on the 6x6x6 reduced RGB cube. + * Consequently we always want libpng to produce sRGB data. + */ + data_encoding = E_sRGB; + + /* Is there any transparency or alpha? */ + if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA || + png_ptr->num_trans > 0) + { + /* Is there alpha in the output too? If so all four channels are + * processed into a special RGB cube with alpha support. + */ + if (output_format & PNG_FORMAT_FLAG_ALPHA) + { + png_uint_32 r; + + if (PNG_RGB_COLORMAP_ENTRIES+1+27 > image->colormap_entries) + png_error(png_ptr, "rgb+alpha color-map: too few entries"); + + cmap_entries = make_rgb_colormap(display); + + /* Add a transparent entry. */ + png_create_colormap_entry(display, cmap_entries, 255, 255, + 255, 0, E_sRGB); + + /* This is stored as the background index for the processing + * algorithm. + */ + background_index = cmap_entries++; + + /* Add 27 r,g,b entries each with alpha 0.5. */ + for (r=0; r<256; r = (r << 1) | 0x7f) + { + png_uint_32 g; + + for (g=0; g<256; g = (g << 1) | 0x7f) + { + png_uint_32 b; + + /* This generates components with the values 0, 127 and + * 255 + */ + for (b=0; b<256; b = (b << 1) | 0x7f) + png_create_colormap_entry(display, cmap_entries++, + r, g, b, 128, E_sRGB); + } + } + + expand_tRNS = 1; + output_processing = PNG_CMAP_RGB_ALPHA; + } + + else + { + /* Alpha/transparency must be removed. The background must + * exist in the color map (achieved by setting adding it after + * the 666 color-map). If the standard processing code will + * pick up this entry automatically that's all that is + * required; libpng can be called to do the background + * processing. + */ + unsigned int sample_size = + PNG_IMAGE_SAMPLE_SIZE(output_format); + png_uint_32 r, g, b; /* sRGB background */ + + if (PNG_RGB_COLORMAP_ENTRIES+1+27 > image->colormap_entries) + png_error(png_ptr, "rgb-alpha color-map: too few entries"); + + cmap_entries = make_rgb_colormap(display); + + png_create_colormap_entry(display, cmap_entries, back_r, + back_g, back_b, 0/*unused*/, output_encoding); + + if (output_encoding == E_LINEAR) + { + r = PNG_sRGB_FROM_LINEAR(back_r * 255); + g = PNG_sRGB_FROM_LINEAR(back_g * 255); + b = PNG_sRGB_FROM_LINEAR(back_b * 255); + } + + else + { + r = back_r; + g = back_g; + b = back_g; + } + + /* Compare the newly-created color-map entry with the one the + * PNG_CMAP_RGB algorithm will use. If the two entries don't + * match, add the new one and set this as the background + * index. + */ + if (memcmp((png_const_bytep)display->colormap + + sample_size * cmap_entries, + (png_const_bytep)display->colormap + + sample_size * PNG_RGB_INDEX(r,g,b), + sample_size) != 0) + { + /* The background color must be added. */ + background_index = cmap_entries++; + + /* Add 27 r,g,b entries each with created by composing with + * the background at alpha 0.5. + */ + for (r=0; r<256; r = (r << 1) | 0x7f) + { + for (g=0; g<256; g = (g << 1) | 0x7f) + { + /* This generates components with the values 0, 127 + * and 255 + */ + for (b=0; b<256; b = (b << 1) | 0x7f) + png_create_colormap_entry(display, cmap_entries++, + png_colormap_compose(display, r, E_sRGB, 128, + back_r, output_encoding), + png_colormap_compose(display, g, E_sRGB, 128, + back_g, output_encoding), + png_colormap_compose(display, b, E_sRGB, 128, + back_b, output_encoding), + 0/*unused*/, output_encoding); + } + } + + expand_tRNS = 1; + output_processing = PNG_CMAP_RGB_ALPHA; + } + + else /* background color is in the standard color-map */ + { + png_color_16 c; + + c.index = 0; /*unused*/ + c.red = (png_uint_16)back_r; + c.gray = c.green = (png_uint_16)back_g; + c.blue = (png_uint_16)back_b; + + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + + output_processing = PNG_CMAP_RGB; + } + } + } + + else /* no alpha or transparency in the input */ + { + /* Alpha in the output is irrelevant, simply map the opaque input + * pixels to the 6x6x6 color-map. + */ + if (PNG_RGB_COLORMAP_ENTRIES > image->colormap_entries) + png_error(png_ptr, "rgb color-map: too few entries"); + + cmap_entries = make_rgb_colormap(display); + output_processing = PNG_CMAP_RGB; + } + } + break; + + case PNG_COLOR_TYPE_PALETTE: + /* It's already got a color-map. It may be necessary to eliminate the + * tRNS entries though. + */ + { + unsigned int num_trans = png_ptr->num_trans; + png_const_bytep trans = num_trans > 0 ? png_ptr->trans_alpha : NULL; + png_const_colorp colormap = png_ptr->palette; + const int do_background = trans != NULL && + (output_format & PNG_FORMAT_FLAG_ALPHA) == 0; + unsigned int i; + + /* Just in case: */ + if (trans == NULL) + num_trans = 0; + + output_processing = PNG_CMAP_NONE; + data_encoding = E_FILE; /* Don't change from color-map indicies */ + cmap_entries = png_ptr->num_palette; + if (cmap_entries > 256) + cmap_entries = 256; + + if (cmap_entries > image->colormap_entries) + png_error(png_ptr, "palette color-map: too few entries"); + + for (i=0; i < cmap_entries; ++i) + { + if (do_background && i < num_trans && trans[i] < 255) + { + if (trans[i] == 0) + png_create_colormap_entry(display, i, back_r, back_g, + back_b, 0, output_encoding); + + else + { + /* Must compose the PNG file color in the color-map entry + * on the sRGB color in 'back'. + */ + png_create_colormap_entry(display, i, + png_colormap_compose(display, colormap[i].red, E_FILE, + trans[i], back_r, output_encoding), + png_colormap_compose(display, colormap[i].green, E_FILE, + trans[i], back_g, output_encoding), + png_colormap_compose(display, colormap[i].blue, E_FILE, + trans[i], back_b, output_encoding), + output_encoding == E_LINEAR ? trans[i] * 257U : + trans[i], + output_encoding); + } + } + + else + png_create_colormap_entry(display, i, colormap[i].red, + colormap[i].green, colormap[i].blue, + i < num_trans ? trans[i] : 255U, E_FILE/*8-bit*/); + } + + /* The PNG data may have indicies packed in fewer than 8 bits, it + * must be expanded if so. + */ + if (png_ptr->bit_depth < 8) + png_set_packing(png_ptr); + } + break; + + default: + png_error(png_ptr, "invalid PNG color type"); + /*NOT REACHED*/ + break; + } + + /* Now deal with the output processing */ + if (expand_tRNS && png_ptr->num_trans > 0 && + (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) == 0) + png_set_tRNS_to_alpha(png_ptr); + + switch (data_encoding) + { + default: + png_error(png_ptr, "bad data option (internal error)"); + break; + + case E_sRGB: + /* Change to 8-bit sRGB */ + png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, PNG_GAMMA_sRGB); + /* FALL THROUGH */ + + case E_FILE: + if (png_ptr->bit_depth > 8) + png_set_scale_16(png_ptr); + break; + } + + if (cmap_entries > 256 || cmap_entries > image->colormap_entries) + png_error(png_ptr, "color map overflow (BAD internal error)"); + + image->colormap_entries = cmap_entries; + + /* Double check using the recorded background index */ + switch (output_processing) + { + case PNG_CMAP_NONE: + if (background_index != PNG_CMAP_NONE_BACKGROUND) + goto bad_background; + break; + + case PNG_CMAP_GA: + if (background_index != PNG_CMAP_GA_BACKGROUND) + goto bad_background; + break; + + case PNG_CMAP_TRANS: + if (background_index >= cmap_entries || + background_index != PNG_CMAP_TRANS_BACKGROUND) + goto bad_background; + break; + + case PNG_CMAP_RGB: + if (background_index != PNG_CMAP_RGB_BACKGROUND) + goto bad_background; + break; + + case PNG_CMAP_RGB_ALPHA: + if (background_index != PNG_CMAP_RGB_ALPHA_BACKGROUND) + goto bad_background; + break; + + default: + png_error(png_ptr, "bad processing option (internal error)"); + + bad_background: + png_error(png_ptr, "bad background index (internal error)"); + } + + display->colormap_processing = output_processing; + + return 1/*ok*/; +} + +/* The final part of the color-map read called from png_image_finish_read. */ +static int +png_image_read_and_map(png_voidp argument) +{ + png_image_read_control *display = png_voidcast(png_image_read_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + int passes; + + /* Called when the libpng data must be transformed into the color-mapped + * form. There is a local row buffer in display->local and this routine must + * do the interlace handling. + */ + switch (png_ptr->interlaced) + { + case PNG_INTERLACE_NONE: + passes = 1; + break; + + case PNG_INTERLACE_ADAM7: + passes = PNG_INTERLACE_ADAM7_PASSES; + break; + + default: + passes = 0; + png_error(png_ptr, "unknown interlace type"); + } + + { + png_uint_32 height = image->height; + png_uint_32 width = image->width; + int proc = display->colormap_processing; + png_bytep first_row = png_voidcast(png_bytep, display->first_row); + ptrdiff_t step_row = display->row_bytes; + int pass; + + for (pass = 0; pass < passes; ++pass) + { + unsigned int startx, stepx, stepy; + png_uint_32 y; + + if (png_ptr->interlaced == PNG_INTERLACE_ADAM7) + { + /* The row may be empty for a short image: */ + if (PNG_PASS_COLS(width, pass) == 0) + continue; + + startx = PNG_PASS_START_COL(pass); + stepx = PNG_PASS_COL_OFFSET(pass); + y = PNG_PASS_START_ROW(pass); + stepy = PNG_PASS_ROW_OFFSET(pass); + } + + else + { + y = 0; + startx = 0; + stepx = stepy = 1; + } + + for (; ylocal_row); + png_bytep outrow = first_row + y * step_row; + png_const_bytep end_row = outrow + width; + + /* Read read the libpng data into the temporary buffer. */ + png_read_row(png_ptr, inrow, NULL); + + /* Now process the row according to the processing option, note + * that the caller verifies that the format of the libpng output + * data is as required. + */ + outrow += startx; + switch (proc) + { + case PNG_CMAP_GA: + for (; outrow < end_row; outrow += stepx) + { + /* The data is always in the PNG order */ + unsigned int gray = *inrow++; + unsigned int alpha = *inrow++; + unsigned int entry; + + /* NOTE: this code is copied as a comment in + * make_ga_colormap above. Please update the + * comment if you change this code! + */ + if (alpha > 229) /* opaque */ + { + entry = (231 * gray + 128) >> 8; + } + else if (alpha < 26) /* transparent */ + { + entry = 231; + } + else /* partially opaque */ + { + entry = 226 + 6 * PNG_DIV51(alpha) + PNG_DIV51(gray); + } + + *outrow = (png_byte)entry; + } + break; + + case PNG_CMAP_TRANS: + for (; outrow < end_row; outrow += stepx) + { + png_byte gray = *inrow++; + png_byte alpha = *inrow++; + + if (alpha == 0) + *outrow = PNG_CMAP_TRANS_BACKGROUND; + + else if (gray != PNG_CMAP_TRANS_BACKGROUND) + *outrow = gray; + + else + *outrow = (png_byte)(PNG_CMAP_TRANS_BACKGROUND+1); + } + break; + + case PNG_CMAP_RGB: + for (; outrow < end_row; outrow += stepx) + { + *outrow = PNG_RGB_INDEX(inrow[0], inrow[1], inrow[2]); + inrow += 3; + } + break; + + case PNG_CMAP_RGB_ALPHA: + for (; outrow < end_row; outrow += stepx) + { + unsigned int alpha = inrow[3]; + + /* Because the alpha entries only hold alpha==0.5 values + * split the processing at alpha==0.25 (64) and 0.75 + * (196). + */ + + if (alpha >= 196) + *outrow = PNG_RGB_INDEX(inrow[0], inrow[1], + inrow[2]); + + else if (alpha < 64) + *outrow = PNG_CMAP_RGB_ALPHA_BACKGROUND; + + else + { + /* Likewise there are three entries for each of r, g + * and b. We could select the entry by popcount on + * the top two bits on those architectures that + * support it, this is what the code below does, + * crudely. + */ + unsigned int back_i = PNG_CMAP_RGB_ALPHA_BACKGROUND+1; + + /* Here are how the values map: + * + * 0x00 .. 0x3f -> 0 + * 0x40 .. 0xbf -> 1 + * 0xc0 .. 0xff -> 2 + * + * So, as above with the explicit alpha checks, the + * breakpoints are at 64 and 196. + */ + if (inrow[0] & 0x80) back_i += 9; /* red */ + if (inrow[0] & 0x40) back_i += 9; + if (inrow[0] & 0x80) back_i += 3; /* green */ + if (inrow[0] & 0x40) back_i += 3; + if (inrow[0] & 0x80) back_i += 1; /* blue */ + if (inrow[0] & 0x40) back_i += 1; + + *outrow = (png_byte)back_i; + } + + inrow += 4; + } + break; + + default: + break; + } + } + } + } + + return 1; +} + +static int +png_image_read_colormapped(png_voidp argument) +{ + png_image_read_control *display = png_voidcast(png_image_read_control*, + argument); + png_imagep image = display->image; + png_controlp control = image->opaque; + png_structrp png_ptr = control->png_ptr; + png_inforp info_ptr = control->info_ptr; + + int passes = 0; /* As a flag */ + + PNG_SKIP_CHUNKS(png_ptr); + + /* Update the 'info' structure and make sure the result is as required; first + * make sure to turn on the interlace handling if it will be required + * (because it can't be turned on *after* the call to png_read_update_info!) + */ + if (display->colormap_processing == PNG_CMAP_NONE) + passes = png_set_interlace_handling(png_ptr); + + png_read_update_info(png_ptr, info_ptr); + + /* The expected output can be deduced from the colormap_processing option. */ + switch (display->colormap_processing) + { + case PNG_CMAP_NONE: + /* Output must be one channel and one byte per pixel, the output + * encoding can be anything. + */ + if ((info_ptr->color_type == PNG_COLOR_TYPE_PALETTE || + info_ptr->color_type == PNG_COLOR_TYPE_GRAY) && + info_ptr->bit_depth == 8) + break; + + goto bad_output; + + case PNG_CMAP_TRANS: + case PNG_CMAP_GA: + /* Output must be two channels and the 'G' one must be sRGB, the latter + * can be checked with an exact number because it should have been set + * to this number above! + */ + if (info_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA && + info_ptr->bit_depth == 8 && + png_ptr->screen_gamma == PNG_GAMMA_sRGB && + image->colormap_entries == 256) + break; + + goto bad_output; + + case PNG_CMAP_RGB: + /* Output must be 8-bit sRGB encoded RGB */ + if (info_ptr->color_type == PNG_COLOR_TYPE_RGB && + info_ptr->bit_depth == 8 && + png_ptr->screen_gamma == PNG_GAMMA_sRGB && + image->colormap_entries == 216) + break; + + goto bad_output; + + case PNG_CMAP_RGB_ALPHA: + /* Output must be 8-bit sRGB encoded RGBA */ + if (info_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA && + info_ptr->bit_depth == 8 && + png_ptr->screen_gamma == PNG_GAMMA_sRGB && + image->colormap_entries == 244 /* 216 + 1 + 27 */) + break; + + /* goto bad_output; */ + /* FALL THROUGH */ + + default: + bad_output: + png_error(png_ptr, "bad color-map processing (internal error)"); + } + + /* Now read the rows. Do this here if it is possible to read directly into + * the output buffer, otherwise allocate a local row buffer of the maximum + * size libpng requires and call the relevant processing routine safely. + */ + { + png_voidp first_row = display->buffer; + ptrdiff_t row_bytes = display->row_stride; + + /* The following expression is designed to work correctly whether it gives + * a signed or an unsigned result. + */ + if (row_bytes < 0) + { + char *ptr = png_voidcast(char*, first_row); + ptr += (image->height-1) * (-row_bytes); + first_row = png_voidcast(png_voidp, ptr); + } + + display->first_row = first_row; + display->row_bytes = row_bytes; + } + + if (passes == 0) + { + int result; + png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr)); + + display->local_row = row; + result = png_safe_execute(image, png_image_read_and_map, display); + display->local_row = NULL; + png_free(png_ptr, row); + + return result; + } + + else + { + png_alloc_size_t row_bytes = display->row_bytes; + + while (--passes >= 0) + { + png_uint_32 y = image->height; + png_bytep row = png_voidcast(png_bytep, display->first_row); + + while (y-- > 0) + { + png_read_row(png_ptr, row, NULL); + row += row_bytes; + } + } + + return 1; + } +} + +/* Just the row reading part of png_image_read. */ +static int +png_image_read_composite(png_voidp argument) +{ + png_image_read_control *display = png_voidcast(png_image_read_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + int passes; + + switch (png_ptr->interlaced) + { + case PNG_INTERLACE_NONE: + passes = 1; + break; + + case PNG_INTERLACE_ADAM7: + passes = PNG_INTERLACE_ADAM7_PASSES; + break; + + default: + passes = 0; + png_error(png_ptr, "unknown interlace type"); + } + + { + png_uint_32 height = image->height; + png_uint_32 width = image->width; + ptrdiff_t step_row = display->row_bytes; + unsigned int channels = (image->format & PNG_FORMAT_FLAG_COLOR) ? 3 : 1; + int pass; + + for (pass = 0; pass < passes; ++pass) + { + unsigned int startx, stepx, stepy; + png_uint_32 y; + + if (png_ptr->interlaced == PNG_INTERLACE_ADAM7) + { + /* The row may be empty for a short image: */ + if (PNG_PASS_COLS(width, pass) == 0) + continue; + + startx = PNG_PASS_START_COL(pass) * channels; + stepx = PNG_PASS_COL_OFFSET(pass) * channels; + y = PNG_PASS_START_ROW(pass); + stepy = PNG_PASS_ROW_OFFSET(pass); + } + + else + { + y = 0; + startx = 0; + stepx = channels; + stepy = 1; + } + + for (; ylocal_row); + png_bytep outrow; + png_const_bytep end_row; + + /* Read the row, which is packed: */ + png_read_row(png_ptr, inrow, NULL); + + outrow = png_voidcast(png_bytep, display->first_row); + outrow += y * step_row; + end_row = outrow + width * channels; + + /* Now do the composition on each pixel in this row. */ + outrow += startx; + for (; outrow < end_row; outrow += stepx) + { + png_byte alpha = inrow[channels]; + + if (alpha > 0) /* else no change to the output */ + { + unsigned int c; + + for (c=0; cimage; + png_structrp png_ptr = image->opaque->png_ptr; + png_inforp info_ptr = image->opaque->info_ptr; + png_uint_32 height = image->height; + png_uint_32 width = image->width; + int pass, passes; + + /* Double check the convoluted logic below. We expect to get here with + * libpng doing rgb to gray and gamma correction but background processing + * left to the png_image_read_background function. The rows libpng produce + * might be 8 or 16-bit but should always have two channels; gray plus alpha. + */ + if ((png_ptr->transformations & PNG_RGB_TO_GRAY) == 0) + png_error(png_ptr, "lost rgb to gray"); + + if ((png_ptr->transformations & PNG_COMPOSE) != 0) + png_error(png_ptr, "unexpected compose"); + + if (png_get_channels(png_ptr, info_ptr) != 2) + png_error(png_ptr, "lost/gained channels"); + + /* Expect the 8-bit case to always remove the alpha channel */ + if ((image->format & PNG_FORMAT_FLAG_LINEAR) == 0 && + (image->format & PNG_FORMAT_FLAG_ALPHA) != 0) + png_error(png_ptr, "unexpected 8-bit transformation"); + + switch (png_ptr->interlaced) + { + case PNG_INTERLACE_NONE: + passes = 1; + break; + + case PNG_INTERLACE_ADAM7: + passes = PNG_INTERLACE_ADAM7_PASSES; + break; + + default: + passes = 0; + png_error(png_ptr, "unknown interlace type"); + } + + switch (png_get_bit_depth(png_ptr, info_ptr)) + { + default: + png_error(png_ptr, "unexpected bit depth"); + break; + + case 8: + /* 8-bit sRGB gray values with an alpha channel; the alpha channel is + * to be removed by composing on a backgroundi: either the row if + * display->background is NULL or display->background->green if not. + * Unlike the code above ALPHA_OPTIMIZED has *not* been done. + */ + { + png_bytep first_row = png_voidcast(png_bytep, display->first_row); + ptrdiff_t step_row = display->row_bytes; + + for (pass = 0; pass < passes; ++pass) + { + png_bytep row = png_voidcast(png_bytep, + display->first_row); + unsigned int startx, stepx, stepy; + png_uint_32 y; + + if (png_ptr->interlaced == PNG_INTERLACE_ADAM7) + { + /* The row may be empty for a short image: */ + if (PNG_PASS_COLS(width, pass) == 0) + continue; + + startx = PNG_PASS_START_COL(pass); + stepx = PNG_PASS_COL_OFFSET(pass); + y = PNG_PASS_START_ROW(pass); + stepy = PNG_PASS_ROW_OFFSET(pass); + } + + else + { + y = 0; + startx = 0; + stepx = stepy = 1; + } + + if (display->background == NULL) + { + for (; ylocal_row); + png_bytep outrow = first_row + y * step_row; + png_const_bytep end_row = outrow + width; + + /* Read the row, which is packed: */ + png_read_row(png_ptr, inrow, NULL); + + /* Now do the composition on each pixel in this row. */ + outrow += startx; + for (; outrow < end_row; outrow += stepx) + { + png_byte alpha = inrow[1]; + + if (alpha > 0) /* else no change to the output */ + { + png_uint_32 component = inrow[0]; + + if (alpha < 255) /* else just use component */ + { + /* Since PNG_OPTIMIZED_ALPHA was not set it is + * necessary to invert the sRGB transfer + * function and multiply the alpha out. + */ + component = png_sRGB_table[component] * alpha; + component += png_sRGB_table[outrow[0]] * + (255-alpha); + component = PNG_sRGB_FROM_LINEAR(component); + } + + outrow[0] = (png_byte)component; + } + + inrow += 2; /* gray and alpha channel */ + } + } + } + + else /* constant background value */ + { + png_byte background8 = display->background->green; + png_uint_16 background = png_sRGB_table[background8]; + + for (; ylocal_row); + png_bytep outrow = first_row + y * step_row; + png_const_bytep end_row = outrow + width; + + /* Read the row, which is packed: */ + png_read_row(png_ptr, inrow, NULL); + + /* Now do the composition on each pixel in this row. */ + outrow += startx; + for (; outrow < end_row; outrow += stepx) + { + png_byte alpha = inrow[1]; + + if (alpha > 0) /* else use background */ + { + png_uint_32 component = inrow[0]; + + if (alpha < 255) /* else just use component */ + { + component = png_sRGB_table[component] * alpha; + component += background * (255-alpha); + component = PNG_sRGB_FROM_LINEAR(component); + } + + outrow[0] = (png_byte)component; + } + + else + outrow[0] = background8; + + inrow += 2; /* gray and alpha channel */ + } + + row += display->row_bytes; + } + } + } + } + break; + + case 16: + /* 16-bit linear with pre-multiplied alpha; the pre-multiplication must + * still be done and, maybe, the alpha channel removed. This code also + * handles the alpha-first option. + */ + { + png_uint_16p first_row = png_voidcast(png_uint_16p, + display->first_row); + /* The division by two is safe because the caller passed in a + * stride which was multiplied by 2 (below) to get row_bytes. + */ + ptrdiff_t step_row = display->row_bytes / 2; + int preserve_alpha = (image->format & PNG_FORMAT_FLAG_ALPHA) != 0; + unsigned int outchannels = 1+preserve_alpha; + int swap_alpha = 0; + + if (preserve_alpha && (image->format & PNG_FORMAT_FLAG_AFIRST)) + swap_alpha = 1; + + for (pass = 0; pass < passes; ++pass) + { + unsigned int startx, stepx, stepy; + png_uint_32 y; + + /* The 'x' start and step are adjusted to output components here. + */ + if (png_ptr->interlaced == PNG_INTERLACE_ADAM7) + { + /* The row may be empty for a short image: */ + if (PNG_PASS_COLS(width, pass) == 0) + continue; + + startx = PNG_PASS_START_COL(pass) * outchannels; + stepx = PNG_PASS_COL_OFFSET(pass) * outchannels; + y = PNG_PASS_START_ROW(pass); + stepy = PNG_PASS_ROW_OFFSET(pass); + } + + else + { + y = 0; + startx = 0; + stepx = outchannels; + stepy = 1; + } + + for (; ylocal_row), NULL); + inrow = png_voidcast(png_const_uint_16p, display->local_row); + + /* Now do the pre-multiplication on each pixel in this row. + */ + outrow += startx; + for (; outrow < end_row; outrow += stepx) + { + png_uint_32 component = inrow[0]; + png_uint_16 alpha = inrow[1]; + + if (alpha > 0) /* else 0 */ + { + if (alpha < 65535) /* else just use component */ + { + component *= alpha; + component += 32767; + component /= 65535; + } + } + + else + component = 0; + + outrow[swap_alpha] = (png_uint_16)component; + if (preserve_alpha) + outrow[1 ^ swap_alpha] = alpha; + + inrow += 2; /* components and alpha channel */ + } + } + } + } + break; + } + + return 1; +} + +/* The guts of png_image_finish_read as a png_safe_execute callback. */ +static int +png_image_read_direct(png_voidp argument) +{ + png_image_read_control *display = png_voidcast(png_image_read_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + png_inforp info_ptr = image->opaque->info_ptr; + + png_uint_32 format = image->format; + int linear = (format & PNG_FORMAT_FLAG_LINEAR) != 0; + int do_local_compose = 0; + int do_local_background = 0; /* to avoid double gamma correction bug */ + int passes = 0; + + /* Add transforms to ensure the correct output format is produced then check + * that the required implementation support is there. Always expand; always + * need 8 bits minimum, no palette and expanded tRNS. + */ + png_set_expand(png_ptr); + + /* Now check the format to see if it was modified. */ + { + png_uint_32 base_format = png_image_format(png_ptr) & + ~PNG_FORMAT_FLAG_COLORMAP /* removed by png_set_expand */; + png_uint_32 change = format ^ base_format; + png_fixed_point output_gamma; + int mode; /* alpha mode */ + + /* Do this first so that we have a record if rgb to gray is happening. */ + if (change & PNG_FORMAT_FLAG_COLOR) + { + /* gray<->color transformation required. */ + if (format & PNG_FORMAT_FLAG_COLOR) + png_set_gray_to_rgb(png_ptr); + + else + { + /* libpng can't do both rgb to gray and + * background/pre-multiplication if there is also significant gamma + * correction, because both operations require linear colors and + * the code only supports one transform doing the gamma correction. + * Handle this by doing the pre-multiplication or background + * operation in this code, if necessary. + * + * TODO: fix this by rewriting pngrtran.c (!) + * + * For the moment (given that fixing this in pngrtran.c is an + * enormous change) 'do_local_background' is used to indicate that + * the problem exists. + */ + if (base_format & PNG_FORMAT_FLAG_ALPHA) + do_local_background = 1/*maybe*/; + + png_set_rgb_to_gray_fixed(png_ptr, PNG_ERROR_ACTION_NONE, + PNG_RGB_TO_GRAY_DEFAULT, PNG_RGB_TO_GRAY_DEFAULT); + } + + change &= ~PNG_FORMAT_FLAG_COLOR; + } + + /* Set the gamma appropriately, linear for 16-bit input, sRGB otherwise. + */ + { + png_fixed_point input_gamma_default; + + if (base_format & PNG_FORMAT_FLAG_LINEAR) + input_gamma_default = PNG_GAMMA_LINEAR; + else + input_gamma_default = PNG_DEFAULT_sRGB; + + /* Call png_set_alpha_mode to set the default for the input gamma; the + * output gamma is set by a second call below. + */ + png_set_alpha_mode_fixed(png_ptr, PNG_ALPHA_PNG, input_gamma_default); + } + + if (linear) + { + /* If there *is* an alpha channel in the input it must be multiplied + * out; use PNG_ALPHA_STANDARD, otherwise just use PNG_ALPHA_PNG. + */ + if (base_format & PNG_FORMAT_FLAG_ALPHA) + mode = PNG_ALPHA_STANDARD; /* associated alpha */ + + else + mode = PNG_ALPHA_PNG; + + output_gamma = PNG_GAMMA_LINEAR; + } + + else + { + mode = PNG_ALPHA_PNG; + output_gamma = PNG_DEFAULT_sRGB; + } + + /* If 'do_local_background' is set check for the presence of gamma + * correction; this is part of the work-round for the libpng bug + * described above. + * + * TODO: fix libpng and remove this. + */ + if (do_local_background) + { + png_fixed_point gtest; + + /* This is 'png_gamma_threshold' from pngrtran.c; the test used for + * gamma correction, the screen gamma hasn't been set on png_struct + * yet; it's set below. png_struct::gamma, however, is set to the + * final value. + */ + if (png_muldiv(>est, output_gamma, png_ptr->colorspace.gamma, + PNG_FP_1) && !png_gamma_significant(gtest)) + do_local_background = 0; + + else if (mode == PNG_ALPHA_STANDARD) + { + do_local_background = 2/*required*/; + mode = PNG_ALPHA_PNG; /* prevent libpng doing it */ + } + + /* else leave as 1 for the checks below */ + } + + /* If the bit-depth changes then handle that here. */ + if (change & PNG_FORMAT_FLAG_LINEAR) + { + if (linear /*16-bit output*/) + png_set_expand_16(png_ptr); + + else /* 8-bit output */ + png_set_scale_16(png_ptr); + + change &= ~PNG_FORMAT_FLAG_LINEAR; + } + + /* Now the background/alpha channel changes. */ + if (change & PNG_FORMAT_FLAG_ALPHA) + { + /* Removing an alpha channel requires composition for the 8-bit + * formats; for the 16-bit it is already done, above, by the + * pre-multiplication and the channel just needs to be stripped. + */ + if (base_format & PNG_FORMAT_FLAG_ALPHA) + { + /* If RGB->gray is happening the alpha channel must be left and the + * operation completed locally. + * + * TODO: fix libpng and remove this. + */ + if (do_local_background) + do_local_background = 2/*required*/; + + /* 16-bit output: just remove the channel */ + else if (linear) /* compose on black (well, pre-multiply) */ + png_set_strip_alpha(png_ptr); + + /* 8-bit output: do an appropriate compose */ + else if (display->background != NULL) + { + png_color_16 c; + + c.index = 0; /*unused*/ + c.red = display->background->red; + c.green = display->background->green; + c.blue = display->background->blue; + c.gray = display->background->green; + + /* This is always an 8-bit sRGB value, using the 'green' channel + * for gray is much better than calculating the luminance here; + * we can get off-by-one errors in that calculation relative to + * the app expectations and that will show up in transparent + * pixels. + */ + png_set_background_fixed(png_ptr, &c, + PNG_BACKGROUND_GAMMA_SCREEN, 0/*need_expand*/, + 0/*gamma: not used*/); + } + + else /* compose on row: implemented below. */ + { + do_local_compose = 1; + /* This leaves the alpha channel in the output, so it has to be + * removed by the code below. Set the encoding to the 'OPTIMIZE' + * one so the code only has to hack on the pixels that require + * composition. + */ + mode = PNG_ALPHA_OPTIMIZED; + } + } + + else /* output needs an alpha channel */ + { + /* This is tricky because it happens before the swap operation has + * been accomplished; however, the swap does *not* swap the added + * alpha channel (weird API), so it must be added in the correct + * place. + */ + png_uint_32 filler; /* opaque filler */ + int where; + + if (linear) + filler = 65535; + + else + filler = 255; + +# ifdef PNG_FORMAT_AFIRST_SUPPORTED + if (format & PNG_FORMAT_FLAG_AFIRST) + { + where = PNG_FILLER_BEFORE; + change &= ~PNG_FORMAT_FLAG_AFIRST; + } + + else +# endif + where = PNG_FILLER_AFTER; + + png_set_add_alpha(png_ptr, filler, where); + } + + /* This stops the (irrelevant) call to swap_alpha below. */ + change &= ~PNG_FORMAT_FLAG_ALPHA; + } + + /* Now set the alpha mode correctly; this is always done, even if there is + * no alpha channel in either the input or the output because it correctly + * sets the output gamma. + */ + png_set_alpha_mode_fixed(png_ptr, mode, output_gamma); + +# ifdef PNG_FORMAT_BGR_SUPPORTED + if (change & PNG_FORMAT_FLAG_BGR) + { + /* Check only the output format; PNG is never BGR; don't do this if + * the output is gray, but fix up the 'format' value in that case. + */ + if (format & PNG_FORMAT_FLAG_COLOR) + png_set_bgr(png_ptr); + + else + format &= ~PNG_FORMAT_FLAG_BGR; + + change &= ~PNG_FORMAT_FLAG_BGR; + } +# endif + +# ifdef PNG_FORMAT_AFIRST_SUPPORTED + if (change & PNG_FORMAT_FLAG_AFIRST) + { + /* Only relevant if there is an alpha channel - it's particularly + * important to handle this correctly because do_local_compose may + * be set above and then libpng will keep the alpha channel for this + * code to remove. + */ + if (format & PNG_FORMAT_FLAG_ALPHA) + { + /* Disable this if doing a local background, + * TODO: remove this when local background is no longer required. + */ + if (do_local_background != 2) + png_set_swap_alpha(png_ptr); + } + + else + format &= ~PNG_FORMAT_FLAG_AFIRST; + + change &= ~PNG_FORMAT_FLAG_AFIRST; + } +# endif + + /* If the *output* is 16-bit then we need to check for a byte-swap on this + * architecture. + */ + if (linear) + { + PNG_CONST png_uint_16 le = 0x0001; + + if (*(png_const_bytep)&le) + png_set_swap(png_ptr); + } + + /* If change is not now 0 some transformation is missing - error out. */ + if (change) + png_error(png_ptr, "png_read_image: unsupported transformation"); + } + + PNG_SKIP_CHUNKS(png_ptr); + + /* Update the 'info' structure and make sure the result is as required; first + * make sure to turn on the interlace handling if it will be required + * (because it can't be turned on *after* the call to png_read_update_info!) + * + * TODO: remove the do_local_background fixup below. + */ + if (!do_local_compose && do_local_background != 2) + passes = png_set_interlace_handling(png_ptr); + + png_read_update_info(png_ptr, info_ptr); + + { + png_uint_32 info_format = 0; + + if (info_ptr->color_type & PNG_COLOR_MASK_COLOR) + info_format |= PNG_FORMAT_FLAG_COLOR; + + if (info_ptr->color_type & PNG_COLOR_MASK_ALPHA) + { + /* do_local_compose removes this channel below. */ + if (!do_local_compose) + { + /* do_local_background does the same if required. */ + if (do_local_background != 2 || + (format & PNG_FORMAT_FLAG_ALPHA) != 0) + info_format |= PNG_FORMAT_FLAG_ALPHA; + } + } + + else if (do_local_compose) /* internal error */ + png_error(png_ptr, "png_image_read: alpha channel lost"); + + if (info_ptr->bit_depth == 16) + info_format |= PNG_FORMAT_FLAG_LINEAR; + +# ifdef PNG_FORMAT_BGR_SUPPORTED + if (png_ptr->transformations & PNG_BGR) + info_format |= PNG_FORMAT_FLAG_BGR; +# endif + +# ifdef PNG_FORMAT_AFIRST_SUPPORTED + if (do_local_background == 2) + { + if (format & PNG_FORMAT_FLAG_AFIRST) + info_format |= PNG_FORMAT_FLAG_AFIRST; + } + + if ((png_ptr->transformations & PNG_SWAP_ALPHA) != 0 || + ((png_ptr->transformations & PNG_ADD_ALPHA) != 0 && + (png_ptr->flags & PNG_FLAG_FILLER_AFTER) == 0)) + { + if (do_local_background == 2) + png_error(png_ptr, "unexpected alpha swap transformation"); + + info_format |= PNG_FORMAT_FLAG_AFIRST; + } +# endif + + /* This is actually an internal error. */ + if (info_format != format) + png_error(png_ptr, "png_read_image: invalid transformations"); + } + + /* Now read the rows. If do_local_compose is set then it is necessary to use + * a local row buffer. The output will be GA, RGBA or BGRA and must be + * converted to G, RGB or BGR as appropriate. The 'local_row' member of the + * display acts as a flag. + */ + { + png_voidp first_row = display->buffer; + ptrdiff_t row_bytes = display->row_stride; + + if (linear) + row_bytes *= 2; + + /* The following expression is designed to work correctly whether it gives + * a signed or an unsigned result. + */ + if (row_bytes < 0) + { + char *ptr = png_voidcast(char*, first_row); + ptr += (image->height-1) * (-row_bytes); + first_row = png_voidcast(png_voidp, ptr); + } + + display->first_row = first_row; + display->row_bytes = row_bytes; + } + + if (do_local_compose) + { + int result; + png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr)); + + display->local_row = row; + result = png_safe_execute(image, png_image_read_composite, display); + display->local_row = NULL; + png_free(png_ptr, row); + + return result; + } + + else if (do_local_background == 2) + { + int result; + png_voidp row = png_malloc(png_ptr, png_get_rowbytes(png_ptr, info_ptr)); + + display->local_row = row; + result = png_safe_execute(image, png_image_read_background, display); + display->local_row = NULL; + png_free(png_ptr, row); + + return result; + } + + else + { + png_alloc_size_t row_bytes = display->row_bytes; + + while (--passes >= 0) + { + png_uint_32 y = image->height; + png_bytep row = png_voidcast(png_bytep, display->first_row); + + while (y-- > 0) + { + png_read_row(png_ptr, row, NULL); + row += row_bytes; + } + } + + return 1; + } +} + +int PNGAPI +png_image_finish_read(png_imagep image, png_const_colorp background, + void *buffer, png_int_32 row_stride, void *colormap) +{ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + png_uint_32 check; + + if (row_stride == 0) + row_stride = PNG_IMAGE_ROW_STRIDE(*image); + + if (row_stride < 0) + check = -row_stride; + + else + check = row_stride; + + if (image->opaque != NULL && buffer != NULL && + check >= PNG_IMAGE_ROW_STRIDE(*image)) + { + if ((image->format & PNG_FORMAT_FLAG_COLORMAP) == 0 || + (image->colormap_entries > 0 && colormap != NULL)) + { + int result; + png_image_read_control display; + + memset(&display, 0, (sizeof display)); + display.image = image; + display.buffer = buffer; + display.row_stride = row_stride; + display.colormap = colormap; + display.background = background; + display.local_row = NULL; + + /* Choose the correct 'end' routine; for the color-map case all the + * setup has already been done. + */ + if (image->format & PNG_FORMAT_FLAG_COLORMAP) + result = + png_safe_execute(image, png_image_read_colormap, &display) && + png_safe_execute(image, png_image_read_colormapped, &display); + + else + result = + png_safe_execute(image, png_image_read_direct, &display); + + png_image_free(image); + return result; + } + + else + return png_image_error(image, + "png_image_finish_read[color-map]: no color-map"); + } + + else + return png_image_error(image, + "png_image_finish_read: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_finish_read: damaged PNG_IMAGE_VERSION"); + + return 0; +} + +#endif /* PNG_SIMPLIFIED_READ_SUPPORTED */ #endif /* PNG_READ_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/pngrio.c libpng-1.6.0beta32/pngrio.c --- libpng-1.5.13/pngrio.c 2012-09-27 06:21:19.711314106 -0500 +++ libpng-1.6.0beta32/pngrio.c 2012-11-25 12:40:10.096634285 -0600 @@ -1,9 +1,9 @@ /* pngrio.c - functions for data input * - * Last changed in libpng 1.5.0 [January 6, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This code is released under the libpng license. @@ -28,9 +28,9 @@ * buffering if you are using unbuffered reads. This should never be asked * to read more then 64K on a 16 bit machine. */ void /* PRIVATE */ -png_read_data(png_structp png_ptr, png_bytep data, png_size_t length) +png_read_data(png_structrp png_ptr, png_bytep data, png_size_t length) { png_debug1(4, "reading %d bytes", (int)length); if (png_ptr->read_data_fn != NULL) @@ -45,9 +45,8 @@ * not reading from a standard C stream, you should create a replacement * read_data function and use it at run time with png_set_read_fn(), rather * than changing the library. */ -# ifndef USE_FAR_KEYWORD void PNGCBAPI png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check; @@ -57,70 +56,13 @@ /* fread() returns 0 on error, so it is OK to store this in a png_size_t * instead of an int, which is what fread() actually returns. */ - check = fread(data, 1, length, (png_FILE_p)png_ptr->io_ptr); + check = fread(data, 1, length, png_voidcast(png_FILE_p, png_ptr->io_ptr)); if (check != length) png_error(png_ptr, "Read Error"); } -# else -/* This is the model-independent version. Since the standard I/O library - can't handle far buffers in the medium and small models, we have to copy - the data. -*/ - -#define NEAR_BUF_SIZE 1024 -#define MIN(a,b) (a <= b ? a : b) - -static void PNGCBAPI -png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length) -{ - png_size_t check; - png_byte *n_data; - png_FILE_p io_ptr; - - if (png_ptr == NULL) - return; - - /* Check if data really is near. If so, use usual code. */ - n_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); - - if ((png_bytep)n_data == data) - { - check = fread(n_data, 1, length, io_ptr); - } - - else - { - png_byte buf[NEAR_BUF_SIZE]; - png_size_t read, remaining, err; - check = 0; - remaining = length; - - do - { - read = MIN(NEAR_BUF_SIZE, remaining); - err = fread(buf, 1, read, io_ptr); - png_memcpy(data, buf, read); /* copy far buffer to near buffer */ - - if (err != read) - break; - - else - check += err; - - data += read; - remaining -= read; - } - while (remaining != 0); - } - - if ((png_uint_32)check != (png_uint_32)length) - png_error(png_ptr, "read Error"); -} -# endif #endif /* This function allows the application to supply a new input function * for libpng if standard C streams aren't being used. @@ -141,9 +83,9 @@ * May be NULL, in which case libpng's default function will * be used. */ void PNGAPI -png_set_read_fn(png_structp png_ptr, png_voidp io_ptr, +png_set_read_fn(png_structrp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn) { if (png_ptr == NULL) return; diff -ru4NwbB libpng-1.5.13/pngrtran.c libpng-1.6.0beta32/pngrtran.c --- libpng-1.5.13/pngrtran.c 2012-09-27 06:21:19.738982768 -0500 +++ libpng-1.6.0beta32/pngrtran.c 2012-11-25 12:40:10.115083694 -0600 @@ -1,8 +1,8 @@ /* pngrtran.c - transforms the data in a row for PNG readers * - * Last changed in libpng 1.5.11 [June 14, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -21,9 +21,9 @@ #ifdef PNG_READ_SUPPORTED /* Set the action on getting a CRC error for an ancillary or critical chunk. */ void PNGAPI -png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action) +png_set_crc_action(png_structrp png_ptr, int crit_action, int ancil_action) { png_debug(1, "in png_set_crc_action"); if (png_ptr == NULL) @@ -87,18 +87,48 @@ break; } } +#ifdef PNG_READ_TRANSFORMS_SUPPORTED +/* Is it OK to set a transformation now? Only if png_start_read_image or + * png_read_update_info have not been called. It is not necessary for the IHDR + * to have been read in all cases, the parameter allows for this check too. + */ +static int +png_rtran_ok(png_structrp png_ptr, int need_IHDR) +{ + if (png_ptr != NULL) + { + if (png_ptr->flags & PNG_FLAG_ROW_INIT) + png_app_error(png_ptr, + "invalid after png_start_read_image or png_read_update_info"); + + else if (need_IHDR && (png_ptr->mode & PNG_HAVE_IHDR) == 0) + png_app_error(png_ptr, "invalid before the PNG header has been read"); + + else + { + /* Turn on failure to initialize correctly for all transforms. */ + png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED; + + return 1; /* Ok */ + } + } + + return 0; /* no png_error possible! */ +} +#endif + #ifdef PNG_READ_BACKGROUND_SUPPORTED /* Handle alpha and tRNS via a background color */ void PNGFAPI -png_set_background_fixed(png_structp png_ptr, +png_set_background_fixed(png_structrp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, png_fixed_point background_gamma) { png_debug(1, "in png_set_background_fixed"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0) || background_color == NULL) return; if (background_gamma_code == PNG_BACKGROUND_GAMMA_UNKNOWN) { @@ -109,10 +139,9 @@ png_ptr->transformations |= PNG_COMPOSE | PNG_STRIP_ALPHA; png_ptr->transformations &= ~PNG_ENCODE_ALPHA; png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; - png_memcpy(&(png_ptr->background), background_color, - png_sizeof(png_color_16)); + png_ptr->background = *background_color; png_ptr->background_gamma = background_gamma; png_ptr->background_gamma_type = (png_byte)(background_gamma_code); if (need_expand) png_ptr->transformations |= PNG_BACKGROUND_EXPAND; @@ -121,9 +150,9 @@ } # ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI -png_set_background(png_structp png_ptr, +png_set_background(png_structrp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma) { png_set_background_fixed(png_ptr, background_color, background_gamma_code, @@ -137,13 +166,13 @@ * TRANSFORM and API behavior to be somewhat consistent, and it's simpler. */ #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED void PNGAPI -png_set_scale_16(png_structp png_ptr) +png_set_scale_16(png_structrp png_ptr) { png_debug(1, "in png_set_scale_16"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= PNG_SCALE_16_TO_8; } @@ -151,35 +180,35 @@ #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED /* Chop 16-bit depth files to 8-bit depth */ void PNGAPI -png_set_strip_16(png_structp png_ptr) +png_set_strip_16(png_structrp png_ptr) { png_debug(1, "in png_set_strip_16"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= PNG_16_TO_8; } #endif #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED void PNGAPI -png_set_strip_alpha(png_structp png_ptr) +png_set_strip_alpha(png_structrp png_ptr) { png_debug(1, "in png_set_strip_alpha"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= PNG_STRIP_ALPHA; } #endif #if defined(PNG_READ_ALPHA_MODE_SUPPORTED) || defined(PNG_READ_GAMMA_SUPPORTED) static png_fixed_point -translate_gamma_flags(png_structp png_ptr, png_fixed_point output_gamma, +translate_gamma_flags(png_structrp png_ptr, png_fixed_point output_gamma, int is_screen) { /* Check for flag values. The main reason for having the old Mac value as a * flag is that it is pretty near impossible to work out what the correct @@ -214,9 +243,9 @@ } # ifdef PNG_FLOATING_POINT_SUPPORTED static png_fixed_point -convert_gamma_value(png_structp png_ptr, double output_gamma) +convert_gamma_value(png_structrp png_ptr, double output_gamma) { /* The following silently ignores cases where fixed point (times 100,000) * gamma values are passed to the floating point API. This is safe and it * means the fixed point constants work just fine with the floating point @@ -239,17 +268,17 @@ #endif /* READ_ALPHA_MODE || READ_GAMMA */ #ifdef PNG_READ_ALPHA_MODE_SUPPORTED void PNGFAPI -png_set_alpha_mode_fixed(png_structp png_ptr, int mode, +png_set_alpha_mode_fixed(png_structrp png_ptr, int mode, png_fixed_point output_gamma) { int compose = 0; png_fixed_point file_gamma; png_debug(1, "in png_set_alpha_mode"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; output_gamma = translate_gamma_flags(png_ptr, output_gamma, 1/*screen*/); @@ -319,10 +348,13 @@ /* Only set the default gamma if the file gamma has not been set (this has * the side effect that the gamma in a second call to png_set_alpha_mode will * be ignored.) */ - if (png_ptr->gamma == 0) - png_ptr->gamma = file_gamma; + if (png_ptr->colorspace.gamma == 0) + { + png_ptr->colorspace.gamma = file_gamma; + png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA; + } /* But always set the output gamma: */ png_ptr->screen_gamma = output_gamma; @@ -331,10 +363,10 @@ */ if (compose) { /* And obtain alpha pre-multiplication by composing on black: */ - png_memset(&png_ptr->background, 0, sizeof png_ptr->background); - png_ptr->background_gamma = png_ptr->gamma; /* just in case */ + memset(&png_ptr->background, 0, (sizeof png_ptr->background)); + png_ptr->background_gamma = png_ptr->colorspace.gamma; /* just in case */ png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_FILE; png_ptr->transformations &= ~PNG_BACKGROUND_EXPAND; if (png_ptr->transformations & PNG_COMPOSE) @@ -342,16 +374,13 @@ "conflicting calls to set alpha mode and background"); png_ptr->transformations |= PNG_COMPOSE; } - - /* New API, make sure apps call the correct initializers: */ - png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED; } # ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI -png_set_alpha_mode(png_structp png_ptr, int mode, double output_gamma) +png_set_alpha_mode(png_structrp png_ptr, int mode, double output_gamma) { png_set_alpha_mode_fixed(png_ptr, mode, convert_gamma_value(png_ptr, output_gamma)); } @@ -369,23 +398,23 @@ */ typedef struct png_dsort_struct { - struct png_dsort_struct FAR * next; + struct png_dsort_struct * next; png_byte left; png_byte right; } png_dsort; -typedef png_dsort FAR * png_dsortp; -typedef png_dsort FAR * FAR * png_dsortpp; +typedef png_dsort * png_dsortp; +typedef png_dsort * * png_dsortpp; void PNGAPI -png_set_quantize(png_structp png_ptr, png_colorp palette, +png_set_quantize(png_structrp png_ptr, png_colorp palette, int num_palette, int maximum_colors, png_const_uint_16p histogram, int full_quantize) { png_debug(1, "in png_set_quantize"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= PNG_QUANTIZE; @@ -393,9 +422,9 @@ { int i; png_ptr->quantize_index = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(num_palette * png_sizeof(png_byte))); + (png_uint_32)(num_palette * (sizeof (png_byte)))); for (i = 0; i < num_palette; i++) png_ptr->quantize_index[i] = (png_byte)i; } @@ -410,9 +439,9 @@ int i; /* Initialize an array to sort colors */ png_ptr->quantize_sort = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(num_palette * png_sizeof(png_byte))); + (png_uint_32)(num_palette * (sizeof (png_byte)))); /* Initialize the quantize_sort array */ for (i = 0; i < num_palette; i++) png_ptr->quantize_sort[i] = (png_byte)i; @@ -544,11 +573,11 @@ t = NULL; /* Initialize palette index arrays */ png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(num_palette * png_sizeof(png_byte))); + (png_uint_32)(num_palette * (sizeof (png_byte)))); png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(num_palette * png_sizeof(png_byte))); + (png_uint_32)(num_palette * (sizeof (png_byte)))); /* Initialize the sort array */ for (i = 0; i < num_palette; i++) { @@ -556,9 +585,9 @@ png_ptr->palette_to_index[i] = (png_byte)i; } hash = (png_dsortpp)png_calloc(png_ptr, (png_uint_32)(769 * - png_sizeof(png_dsortp))); + (sizeof (png_dsortp)))); num_new_palette = num_palette; /* Initial wild guess at how far apart the farthest pixel @@ -586,9 +615,9 @@ if (d <= max_d) { t = (png_dsortp)png_malloc_warn(png_ptr, - (png_uint_32)(png_sizeof(png_dsort))); + (png_uint_32)(sizeof (png_dsort))); if (t == NULL) break; @@ -711,14 +740,14 @@ int num_blue = (1 << PNG_QUANTIZE_BLUE_BITS); png_size_t num_entries = ((png_size_t)1 << total_bits); png_ptr->palette_lookup = (png_bytep)png_calloc(png_ptr, - (png_uint_32)(num_entries * png_sizeof(png_byte))); + (png_uint_32)(num_entries * (sizeof (png_byte)))); distance = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_entries * - png_sizeof(png_byte))); + (sizeof (png_byte)))); - png_memset(distance, 0xff, num_entries * png_sizeof(png_byte)); + memset(distance, 0xff, num_entries * (sizeof (png_byte))); for (i = 0; i < num_palette; i++) { int ir, ig, ib; @@ -765,49 +794,49 @@ #endif /* PNG_READ_QUANTIZE_SUPPORTED */ #ifdef PNG_READ_GAMMA_SUPPORTED void PNGFAPI -png_set_gamma_fixed(png_structp png_ptr, png_fixed_point scrn_gamma, +png_set_gamma_fixed(png_structrp png_ptr, png_fixed_point scrn_gamma, png_fixed_point file_gamma) { png_debug(1, "in png_set_gamma_fixed"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; /* New in libpng-1.5.4 - reserve particular negative values as flags. */ scrn_gamma = translate_gamma_flags(png_ptr, scrn_gamma, 1/*screen*/); file_gamma = translate_gamma_flags(png_ptr, file_gamma, 0/*file*/); -#if PNG_LIBPNG_VER >= 10600 /* Checking the gamma values for being >0 was added in 1.5.4 along with the * premultiplied alpha support; this actually hides an undocumented feature * of the previous implementation which allowed gamma processing to be * disabled in background handling. There is no evidence (so far) that this * was being used; however, png_set_background itself accepted and must still * accept '0' for the gamma value it takes, because it isn't always used. * * Since this is an API change (albeit a very minor one that removes an - * undocumented API feature) it will not be made until libpng-1.6.0. + * undocumented API feature) the following checks were only enabled in + * libpng-1.6.0. */ if (file_gamma <= 0) png_error(png_ptr, "invalid file gamma in png_set_gamma"); if (scrn_gamma <= 0) png_error(png_ptr, "invalid screen gamma in png_set_gamma"); -#endif /* Set the gamma values unconditionally - this overrides the value in the PNG * file if a gAMA chunk was present. png_set_alpha_mode provides a * different, easier, way to default the file gamma. */ - png_ptr->gamma = file_gamma; + png_ptr->colorspace.gamma = file_gamma; + png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA; png_ptr->screen_gamma = scrn_gamma; } # ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI -png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma) +png_set_gamma(png_structrp png_ptr, double scrn_gamma, double file_gamma) { png_set_gamma_fixed(png_ptr, convert_gamma_value(png_ptr, scrn_gamma), convert_gamma_value(png_ptr, file_gamma)); } @@ -819,17 +848,16 @@ * less than 8-bit depth to 8-bit depth, and expand tRNS chunks * to alpha channels. */ void PNGAPI -png_set_expand(png_structp png_ptr) +png_set_expand(png_structrp png_ptr) { png_debug(1, "in png_set_expand"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } /* GRR 19990627: the following three functions currently are identical * to png_set_expand(). However, it is entirely reasonable that someone @@ -850,89 +878,84 @@ */ /* Expand paletted images to RGB. */ void PNGAPI -png_set_palette_to_rgb(png_structp png_ptr) +png_set_palette_to_rgb(png_structrp png_ptr) { png_debug(1, "in png_set_palette_to_rgb"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } /* Expand grayscale images of less than 8-bit depth to 8 bits. */ void PNGAPI -png_set_expand_gray_1_2_4_to_8(png_structp png_ptr) +png_set_expand_gray_1_2_4_to_8(png_structrp png_ptr) { png_debug(1, "in png_set_expand_gray_1_2_4_to_8"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= PNG_EXPAND; - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } - - /* Expand tRNS chunks to alpha channels. */ void PNGAPI -png_set_tRNS_to_alpha(png_structp png_ptr) +png_set_tRNS_to_alpha(png_structrp png_ptr) { png_debug(1, "in png_set_tRNS_to_alpha"); + if (!png_rtran_ok(png_ptr, 0)) + return; + png_ptr->transformations |= (PNG_EXPAND | PNG_EXPAND_tRNS); - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; } #endif /* defined(PNG_READ_EXPAND_SUPPORTED) */ #ifdef PNG_READ_EXPAND_16_SUPPORTED /* Expand to 16-bit channels, expand the tRNS chunk too (because otherwise * it may not work correctly.) */ void PNGAPI -png_set_expand_16(png_structp png_ptr) +png_set_expand_16(png_structrp png_ptr) { png_debug(1, "in png_set_expand_16"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; png_ptr->transformations |= (PNG_EXPAND_16 | PNG_EXPAND | PNG_EXPAND_tRNS); - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; - - /* New API, make sure apps call the correct initializers: */ - png_ptr->flags |= PNG_FLAG_DETECT_UNINITIALIZED; } #endif #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED void PNGAPI -png_set_gray_to_rgb(png_structp png_ptr) +png_set_gray_to_rgb(png_structrp png_ptr) { png_debug(1, "in png_set_gray_to_rgb"); - if (png_ptr != NULL) - { + if (!png_rtran_ok(png_ptr, 0)) + return; + /* Because rgb must be 8 bits or more: */ png_set_expand_gray_1_2_4_to_8(png_ptr); png_ptr->transformations |= PNG_GRAY_TO_RGB; - png_ptr->flags &= ~PNG_FLAG_ROW_INIT; - } } #endif #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED void PNGFAPI -png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action, +png_set_rgb_to_gray_fixed(png_structrp png_ptr, int error_action, png_fixed_point red, png_fixed_point green) { png_debug(1, "in png_set_rgb_to_gray"); - if (png_ptr == NULL) + /* Need the IHDR here because of the check on color_type below. */ + /* TODO: fix this */ + if (!png_rtran_ok(png_ptr, 1)) return; switch(error_action) { @@ -956,12 +980,15 @@ #ifdef PNG_READ_EXPAND_SUPPORTED png_ptr->transformations |= PNG_EXPAND; #else { - png_warning(png_ptr, + /* Make this an error in 1.6 because otherwise the application may assume + * that it just worked and get a memory overwrite. + */ + png_error(png_ptr, "Cannot do RGB_TO_GRAY without EXPAND_SUPPORTED"); - png_ptr->transformations &= ~PNG_RGB_TO_GRAY; + /* png_ptr->transformations &= ~PNG_RGB_TO_GRAY; */ } #endif { if (red >= 0 && green >= 0 && red + green <= PNG_FP_1) @@ -983,9 +1010,9 @@ else { if (red >= 0 && green >= 0) - png_warning(png_ptr, + png_app_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients"); /* Use the defaults, from the cHRM chunk if set, else the historical * values which are close to the sRGB/HDTV/ITU-Rec 709 values. See @@ -1009,31 +1036,28 @@ * for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image. */ void PNGAPI -png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red, +png_set_rgb_to_gray(png_structrp png_ptr, int error_action, double red, double green) { - if (png_ptr == NULL) - return; - png_set_rgb_to_gray_fixed(png_ptr, error_action, png_fixed(png_ptr, red, "rgb to gray red coefficient"), png_fixed(png_ptr, green, "rgb to gray green coefficient")); } #endif /* FLOATING POINT */ -#endif +#endif /* RGB_TO_GRAY */ #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) void PNGAPI -png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr +png_set_read_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr read_user_transform_fn) { png_debug(1, "in png_set_read_user_transform_fn"); - if (png_ptr == NULL) + if (!png_rtran_ok(png_ptr, 0)) return; #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED png_ptr->transformations |= PNG_USER_TRANSFORM; @@ -1073,9 +1097,9 @@ * The intent is that these two routines should have palette or rgb operations * extracted from 'png_init_read_transformations'. */ static void /* PRIVATE */ -png_init_palette_transformations(png_structp png_ptr) +png_init_palette_transformations(png_structrp png_ptr) { /* Called to handle the (input) palette case. In png_do_read_transformations * the first step is to expand the palette if requested, so this code must * take care to only make changes that are invariant with respect to the @@ -1156,9 +1180,9 @@ #endif /* PNG_READ_EXPAND_SUPPORTED && PNG_READ_BACKGROUND_SUPPORTED */ } static void /* PRIVATE */ -png_init_rgb_transformations(png_structp png_ptr) +png_init_rgb_transformations(png_structrp png_ptr) { /* Added to libpng-1.5.4: check the color type to determine whether there * is any alpha or transparency in the image and simply cancel the * background and alpha mode stuff if there isn't. @@ -1241,9 +1265,9 @@ #endif /* PNG_READ_EXPAND_SUPPORTED && PNG_READ_BACKGROUND_SUPPORTED */ } void /* PRIVATE */ -png_init_read_transformations(png_structp png_ptr) +png_init_read_transformations(png_structrp png_ptr) { png_debug(1, "in png_init_read_transformations"); /* This internal function is called from png_read_start_row in pngrutil.c @@ -1266,36 +1290,39 @@ * required. */ int gamma_correction = 0; - if (png_ptr->gamma != 0) /* has been set */ + if (png_ptr->colorspace.gamma != 0) /* has been set */ { if (png_ptr->screen_gamma != 0) /* screen set too */ - gamma_correction = png_gamma_threshold(png_ptr->gamma, + gamma_correction = png_gamma_threshold(png_ptr->colorspace.gamma, png_ptr->screen_gamma); else /* Assume the output matches the input; a long time default behavior * of libpng, although the standard has nothing to say about this. */ - png_ptr->screen_gamma = png_reciprocal(png_ptr->gamma); + png_ptr->screen_gamma = png_reciprocal(png_ptr->colorspace.gamma); } else if (png_ptr->screen_gamma != 0) /* The converse - assume the file matches the screen, note that this * perhaps undesireable default can (from 1.5.4) be changed by calling * png_set_alpha_mode (even if the alpha handling mode isn't required * or isn't changed from the default.) */ - png_ptr->gamma = png_reciprocal(png_ptr->screen_gamma); + png_ptr->colorspace.gamma = png_reciprocal(png_ptr->screen_gamma); else /* neither are set */ /* Just in case the following prevents any processing - file and screen * are both assumed to be linear and there is no way to introduce a * third gamma value other than png_set_background with 'UNIQUE', and, * prior to 1.5.4 */ - png_ptr->screen_gamma = png_ptr->gamma = PNG_FP_1; + png_ptr->screen_gamma = png_ptr->colorspace.gamma = PNG_FP_1; + + /* We have a gamma value now. */ + png_ptr->colorspace.flags |= PNG_COLORSPACE_HAVE_GAMMA; /* Now turn the gamma transformation on or off as appropriate. Notice * that PNG_GAMMA just refers to the file->screen correction. Alpha * composition may independently cause gamma correction because it needs @@ -1375,11 +1402,18 @@ png_ptr->flags &= ~PNG_FLAG_OPTIMIZE_ALPHA; } #endif -#if defined(PNG_READ_EXPAND_SUPPORTED) && \ - defined(PNG_READ_BACKGROUND_SUPPORTED) && \ - defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) +#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED + /* Make sure the coefficients for the rgb to gray conversion are set + * appropriately. + */ + if (png_ptr->transformations & PNG_RGB_TO_GRAY) + png_colorspace_set_rgb_coefficients(png_ptr); +#endif + +#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED +#if defined PNG_READ_EXPAND_SUPPORTED && defined PNG_READ_BACKGROUND_SUPPORTED /* Detect gray background and attempt to enable optimization for * gray --> RGB case. * * Note: if PNG_BACKGROUND_EXPAND is set and color_type is either RGB or @@ -1419,9 +1453,10 @@ png_ptr->background.gray = png_ptr->background.red; } } } -#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED (etc) */ +#endif /* PNG_READ_EXPAND_SUPPORTED && PNG_READ_BACKGROUND_SUPPORTED */ +#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */ /* For indexed PNG data (PNG_COLOR_TYPE_PALETTE) many of the transformations * can be performed directly on the palette, and some (such as rgb to gray) * can be optimized inside the palette. This is particularly true of the @@ -1455,9 +1490,9 @@ * * NOTE: this discards the low 16 bits of the user supplied background * color, but until expand_16 works properly there is no choice! */ -# define CHOP(x) (x)=((png_uint_16)(((png_uint_32)(x)*255+32895) >> 16)) +# define CHOP(x) (x)=((png_uint_16)PNG_DIV257(x)) CHOP(png_ptr->background.red); CHOP(png_ptr->background.green); CHOP(png_ptr->background.blue); CHOP(png_ptr->background.gray); @@ -1515,12 +1550,12 @@ * tables. */ if ((png_ptr->transformations & PNG_GAMMA) || ((png_ptr->transformations & PNG_RGB_TO_GRAY) - && (png_gamma_significant(png_ptr->gamma) || + && (png_gamma_significant(png_ptr->colorspace.gamma) || png_gamma_significant(png_ptr->screen_gamma))) || ((png_ptr->transformations & PNG_COMPOSE) - && (png_gamma_significant(png_ptr->gamma) + && (png_gamma_significant(png_ptr->colorspace.gamma) || png_gamma_significant(png_ptr->screen_gamma) # ifdef PNG_READ_BACKGROUND_SUPPORTED || (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_UNIQUE && png_gamma_significant(png_ptr->background_gamma)) @@ -1575,10 +1610,10 @@ gs = PNG_FP_1; break; case PNG_BACKGROUND_GAMMA_FILE: - g = png_reciprocal(png_ptr->gamma); - gs = png_reciprocal2(png_ptr->gamma, + g = png_reciprocal(png_ptr->colorspace.gamma); + gs = png_reciprocal2(png_ptr->colorspace.gamma, png_ptr->screen_gamma); break; case PNG_BACKGROUND_GAMMA_UNIQUE: @@ -1684,10 +1719,11 @@ /* gs = PNG_FP_1; */ break; case PNG_BACKGROUND_GAMMA_FILE: - g = png_reciprocal(png_ptr->gamma); - gs = png_reciprocal2(png_ptr->gamma, png_ptr->screen_gamma); + g = png_reciprocal(png_ptr->colorspace.gamma); + gs = png_reciprocal2(png_ptr->colorspace.gamma, + png_ptr->screen_gamma); break; case PNG_BACKGROUND_GAMMA_UNIQUE: g = png_reciprocal(png_ptr->background_gamma); @@ -1876,9 +1912,9 @@ * info should be updated so a PNG file could be written with it, * assuming the transformations result in valid PNG data. */ void /* PRIVATE */ -png_read_transform_info(png_structp png_ptr, png_infop info_ptr) +png_read_transform_info(png_structrp png_ptr, png_inforp info_ptr) { png_debug(1, "in png_read_transform_info"); #ifdef PNG_READ_EXPAND_SUPPORTED @@ -1927,10 +1963,14 @@ /* The following used to be conditional on PNG_GAMMA (prior to 1.5.4), * however it seems that the code in png_init_read_transformations, which has * been called before this from png_read_update_info->png_read_start_row * sometimes does the gamma transform and cancels the flag. + * + * TODO: this looks wrong; the info_ptr should end up with a gamma equal to + * the screen_gamma value. The following probably results in weirdness if + * the info_ptr is used by the app after the rows have been read. */ - info_ptr->gamma = png_ptr->gamma; + info_ptr->colorspace.gamma = png_ptr->colorspace.gamma; #endif if (info_ptr->bit_depth == 16) { @@ -2076,9 +2116,9 @@ * and is very touchy. If you add a transformation, take care to * decide how it fits in with the other transformations here. */ void /* PRIVATE */ -png_do_read_transformations(png_structp png_ptr, png_row_infop row_info) +png_do_read_transformations(png_structrp png_ptr, png_row_infop row_info) { png_debug(1, "in png_do_read_transformations"); if (png_ptr->row_buf == NULL) @@ -2091,10 +2131,11 @@ } /* The following is debugging; prior to 1.5.4 the code was never compiled in; * in 1.5.4 PNG_FLAG_DETECT_UNINITIALIZED was added and the macro - * PNG_WARN_UNINITIALIZED_ROW removed. In 1.5 the new flag is set only for - * selected new APIs to ensure that there is no API change. + * PNG_WARN_UNINITIALIZED_ROW removed. In 1.6 the new flag is set only for + * all transformations, however in practice the ROW_INIT always gets done on + * demand, if necessary. */ if ((png_ptr->flags & PNG_FLAG_DETECT_UNINITIALIZED) != 0 && !(png_ptr->flags & PNG_FLAG_ROW_INIT)) { @@ -3223,9 +3264,9 @@ * calculated to make the sum 32768. This will result in different rounding * to that used above. */ int /* PRIVATE */ -png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row) +png_do_rgb_to_gray(png_structrp png_ptr, png_row_infop row_info, png_bytep row) { int rgb_error = 0; @@ -3242,9 +3283,9 @@ (row_info->color_type & PNG_COLOR_MASK_ALPHA) != 0; if (row_info->bit_depth == 8) { -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED /* Notice that gamma to/from 1 are not necessarily inverses (if * there is an overall gamma correction). Prior to 1.5.5 this code * checked the linearized values for equality; this doesn't match * the documentation, the original values must be checked. @@ -3319,9 +3360,9 @@ } else /* RGB bit_depth == 16 */ { -#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) +#ifdef PNG_READ_GAMMA_SUPPORTED if (png_ptr->gamma_16_to_1 != NULL && png_ptr->gamma_16_from_1 != NULL) { png_bytep sp = row; png_bytep dp = row; @@ -3483,9 +3524,9 @@ * "background" is already in the screen gamma, while "background_1" is * at a gamma of 1.0. Paletted files have already been taken care of. */ void /* PRIVATE */ -png_do_compose(png_row_infop row_info, png_bytep row, png_structp png_ptr) +png_do_compose(png_row_infop row_info, png_bytep row, png_structrp png_ptr) { #ifdef PNG_READ_GAMMA_SUPPORTED png_const_bytep gamma_table = png_ptr->gamma_table; png_const_bytep gamma_from_1 = png_ptr->gamma_from_1; @@ -3493,14 +3534,14 @@ png_const_uint_16pp gamma_16 = png_ptr->gamma_16_table; png_const_uint_16pp gamma_16_from_1 = png_ptr->gamma_16_from_1; png_const_uint_16pp gamma_16_to_1 = png_ptr->gamma_16_to_1; int gamma_shift = png_ptr->gamma_shift; + int optimize = (png_ptr->flags & PNG_FLAG_OPTIMIZE_ALPHA) != 0; #endif png_bytep sp; png_uint_32 i; png_uint_32 row_width = row_info->width; - int optimize = (png_ptr->flags & PNG_FLAG_OPTIMIZE_ALPHA) != 0; int shift; png_debug(1, "in png_do_compose"); @@ -3519,10 +3560,11 @@ { if ((png_uint_16)((*sp >> shift) & 0x01) == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff); - *sp |= (png_byte)(png_ptr->background.gray << shift); + unsigned int tmp = *sp & (0x7f7f >> (7 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } if (!shift) { @@ -3547,19 +3589,21 @@ { if ((png_uint_16)((*sp >> shift) & 0x03) == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *sp |= (png_byte)(png_ptr->background.gray << shift); + unsigned int tmp = *sp & (0x3f3f >> (6 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } else { - png_byte p = (png_byte)((*sp >> shift) & 0x03); - png_byte g = (png_byte)((gamma_table [p | (p << 2) | - (p << 4) | (p << 6)] >> 6) & 0x03); - *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *sp |= (png_byte)(g << shift); + unsigned int p = (*sp >> shift) & 0x03; + unsigned int g = (gamma_table [p | (p << 2) | + (p << 4) | (p << 6)] >> 6) & 0x03; + unsigned int tmp = *sp & (0x3f3f >> (6 - shift)); + tmp |= g << shift; + *sp = (png_byte)(tmp & 0xff); } if (!shift) { @@ -3581,10 +3625,11 @@ { if ((png_uint_16)((*sp >> shift) & 0x03) == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff); - *sp |= (png_byte)(png_ptr->background.gray << shift); + unsigned int tmp = *sp & (0x3f3f >> (6 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } if (!shift) { @@ -3610,19 +3655,21 @@ { if ((png_uint_16)((*sp >> shift) & 0x0f) == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *sp |= (png_byte)(png_ptr->background.gray << shift); + unsigned int tmp = *sp & (0xf0f >> (4 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } else { - png_byte p = (png_byte)((*sp >> shift) & 0x0f); - png_byte g = (png_byte)((gamma_table[p | - (p << 4)] >> 4) & 0x0f); - *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *sp |= (png_byte)(g << shift); + unsigned int p = (*sp >> shift) & 0x0f; + unsigned int g = (gamma_table[p | (p << 4)] >> 4) & + 0x0f; + unsigned int tmp = *sp & (0xf0f >> (4 - shift)); + tmp |= g << shift; + *sp = (png_byte)(tmp & 0xff); } if (!shift) { @@ -3644,10 +3691,11 @@ { if ((png_uint_16)((*sp >> shift) & 0x0f) == png_ptr->trans_color.gray) { - *sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff); - *sp |= (png_byte)(png_ptr->background.gray << shift); + unsigned int tmp = *sp & (0xf0f >> (4 - shift)); + tmp |= png_ptr->background.gray << shift; + *sp = (png_byte)(tmp & 0xff); } if (!shift) { @@ -3919,9 +3967,9 @@ if (a == 0) *sp = (png_byte)png_ptr->background.gray; else if (a < 0xff) - png_composite(*sp, *sp, a, png_ptr->background_1.gray); + png_composite(*sp, *sp, a, png_ptr->background.gray); } } } else /* if (png_ptr->bit_depth == 16) */ @@ -3988,9 +4036,9 @@ { png_uint_16 g, v; g = (png_uint_16)(((*sp) << 8) + *(sp + 1)); - png_composite_16(v, g, a, png_ptr->background_1.gray); + png_composite_16(v, g, a, png_ptr->background.gray); *sp = (png_byte)((v >> 8) & 0xff); *(sp + 1) = (png_byte)(v & 0xff); } } @@ -4125,27 +4173,27 @@ v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp]; png_composite_16(w, v, a, png_ptr->background_1.red); if (!optimize) - w = gamma_16_from_1[((w&0xff) >> gamma_shift)] - [w >> 8]; + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> + 8]; *sp = (png_byte)((w >> 8) & 0xff); *(sp + 1) = (png_byte)(w & 0xff); v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)]; png_composite_16(w, v, a, png_ptr->background_1.green); if (!optimize) - w = gamma_16_from_1[((w&0xff) >> gamma_shift)] - [w >> 8]; + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> + 8]; *(sp + 2) = (png_byte)((w >> 8) & 0xff); *(sp + 3) = (png_byte)(w & 0xff); v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)]; png_composite_16(w, v, a, png_ptr->background_1.blue); if (!optimize) - w = gamma_16_from_1[((w&0xff) >> gamma_shift)] - [w >> 8]; + w = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> + 8]; *(sp + 4) = (png_byte)((w >> 8) & 0xff); *(sp + 5) = (png_byte)(w & 0xff); } @@ -4216,9 +4264,9 @@ * is 16, use gamma_16_table and gamma_shift. Build these with * build_gamma_table(). */ void /* PRIVATE */ -png_do_gamma(png_row_infop row_info, png_bytep row, png_structp png_ptr) +png_do_gamma(png_row_infop row_info, png_bytep row, png_structrp png_ptr) { png_const_bytep gamma_table = png_ptr->gamma_table; png_const_uint_16pp gamma_16_table = png_ptr->gamma_16_table; int gamma_shift = png_ptr->gamma_shift; @@ -4417,9 +4465,9 @@ * linear.) Called only with color types that have an alpha channel. Needs the * from_1 tables. */ void /* PRIVATE */ -png_do_encode_alpha(png_row_infop row_info, png_bytep row, png_structp png_ptr) +png_do_encode_alpha(png_row_infop row_info, png_bytep row, png_structrp png_ptr) { png_uint_32 row_width = row_info->width; png_debug(1, "in png_do_encode_alpha"); @@ -4649,17 +4697,17 @@ { if (row_info->color_type == PNG_COLOR_TYPE_GRAY) { - png_uint_16 gray = (png_uint_16)(trans_color ? trans_color->gray : 0); + unsigned int gray = trans_color ? trans_color->gray : 0; if (row_info->bit_depth < 8) { switch (row_info->bit_depth) { case 1: { - gray = (png_uint_16)((gray & 0x01) * 0xff); + gray = (gray & 0x01) * 0xff; sp = row + (png_size_t)((row_width - 1) >> 3); dp = row + (png_size_t)row_width - 1; shift = 7 - (int)((row_width + 7) & 0x07); for (i = 0; i < row_width; i++) @@ -4685,9 +4733,9 @@ } case 2: { - gray = (png_uint_16)((gray & 0x03) * 0x55); + gray = (gray & 0x03) * 0x55; sp = row + (png_size_t)((row_width - 1) >> 2); dp = row + (png_size_t)row_width - 1; shift = (int)((3 - ((row_width + 3) & 0x03)) << 1); for (i = 0; i < row_width; i++) @@ -4710,9 +4758,9 @@ } case 4: { - gray = (png_uint_16)((gray & 0x0f) * 0x11); + gray = (gray & 0x0f) * 0x11; sp = row + (png_size_t)((row_width - 1) >> 1); dp = row + (png_size_t)row_width - 1; shift = (int)((1 - ((row_width + 1) & 0x01)) << 2); for (i = 0; i < row_width; i++) @@ -4763,10 +4811,10 @@ } else if (row_info->bit_depth == 16) { - png_byte gray_high = (png_byte)((gray >> 8) & 0xff); - png_byte gray_low = (png_byte)(gray & 0xff); + unsigned int gray_high = (gray >> 8) & 0xff; + unsigned int gray_low = gray & 0xff; sp = row + row_info->rowbytes - 1; dp = row + (row_info->rowbytes << 1) - 1; for (i = 0; i < row_width; i++) { diff -ru4NwbB libpng-1.5.13/pngrutil.c libpng-1.6.0beta32/pngrutil.c --- libpng-1.5.13/pngrutil.c 2012-09-27 06:21:19.755234171 -0500 +++ libpng-1.6.0beta32/pngrutil.c 2012-11-25 12:40:10.132283366 -0600 @@ -1,8 +1,8 @@ /* pngrutil.c - utilities to read a PNG file * - * Last changed in libpng 1.5.10 [March 8, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -20,9 +20,9 @@ #define png_strtod(p,a,b) strtod(a,b) png_uint_32 PNGAPI -png_get_uint_31(png_structp png_ptr, png_const_bytep buf) +png_get_uint_31(png_const_structrp png_ptr, png_const_bytep buf) { png_uint_32 uval = png_get_uint_32(buf); if (uval > PNG_UINT_31_MAX) @@ -39,9 +39,9 @@ */ #define PNG_FIXED_ERROR (-1) static png_fixed_point /* PRIVATE */ -png_get_fixed_point(png_structp png_ptr, png_const_bytep buf) +png_get_fixed_point(png_structrp png_ptr, png_const_bytep buf) { png_uint_32 uval = png_get_uint_32(buf); if (uval <= PNG_UINT_31_MAX) @@ -113,9 +113,9 @@ #endif /* PNG_READ_INT_FUNCTIONS_SUPPORTED */ /* Read and check the PNG file signature */ void /* PRIVATE */ -png_read_sig(png_structp png_ptr, png_infop info_ptr) +png_read_sig(png_structrp png_ptr, png_inforp info_ptr) { png_size_t num_checked, num_to_check; /* Exit if the user application does not expect a signature. */ @@ -148,9 +148,9 @@ /* Read the chunk header (length + type name). * Put the type name into png_ptr->chunk_name, and return the length. */ png_uint_32 /* PRIVATE */ -png_read_chunk_header(png_structp png_ptr) +png_read_chunk_header(png_structrp png_ptr) { png_byte buf[8]; png_uint_32 length; @@ -185,9 +185,9 @@ } /* Read data, and (optionally) run it through the CRC. */ void /* PRIVATE */ -png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length) +png_crc_read(png_structrp png_ptr, png_bytep buf, png_uint_32 length) { if (png_ptr == NULL) return; @@ -195,26 +195,29 @@ png_calculate_crc(png_ptr, buf, length); } /* Optionally skip data and then check the CRC. Depending on whether we - * are reading a ancillary or critical chunk, and how the program has set + * are reading an ancillary or critical chunk, and how the program has set * things up, we may calculate the CRC on the data and print a message. * Returns '1' if there was a CRC error, '0' otherwise. */ int /* PRIVATE */ -png_crc_finish(png_structp png_ptr, png_uint_32 skip) +png_crc_finish(png_structrp png_ptr, png_uint_32 skip) { - png_size_t i; - png_size_t istop = png_ptr->zbuf_size; - - for (i = (png_size_t)skip; i > istop; i -= istop) + /* The size of the local buffer for inflate is a good guess as to a + * reasonable size to use for buffering reads from the application. + */ + while (skip > 0) { - png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - } + png_uint_32 len; + png_byte tmpbuf[PNG_INFLATE_BUF_SIZE]; - if (i) - { - png_crc_read(png_ptr, png_ptr->zbuf, i); + len = (sizeof tmpbuf); + if (len > skip) + len = skip; + skip -= len; + + png_crc_read(png_ptr, tmpbuf, len); } if (png_crc_error(png_ptr)) { @@ -240,9 +243,9 @@ /* Compare the CRC stored in the PNG file with that calculated by libpng from * the data it has read thus far. */ int /* PRIVATE */ -png_crc_error(png_structp png_ptr) +png_crc_error(png_structrp png_ptr) { png_byte crc_bytes[4]; png_uint_32 crc; int need_crc = 1; @@ -276,250 +279,510 @@ else return (0); } -#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED -static png_size_t -png_inflate(png_structp png_ptr, png_bytep data, png_size_t size, - png_bytep output, png_size_t output_size) -{ - png_size_t count = 0; - - /* zlib can't necessarily handle more than 65535 bytes at once (i.e. it can't - * even necessarily handle 65536 bytes) because the type uInt is "16 bits or - * more". Consequently it is necessary to chunk the input to zlib. This - * code uses ZLIB_IO_MAX, from pngpriv.h, as the maximum (the maximum value - * that can be stored in a uInt.) It is possible to set ZLIB_IO_MAX to a - * lower value in pngpriv.h and this may sometimes have a performance - * advantage, because it forces access of the input data to be separated from - * at least some of the use by some period of time. +/* Manage the read buffer; this simply reallocates the buffer if it is not small + * enough (or if it is not allocated). The routine returns a pointer to the + * buffer; if an error occurs and 'warn' is set the routine returns NULL, else + * it will call png_error (via png_malloc) on failure. (warn == 2 means + * 'silent'). */ - png_ptr->zstream.next_in = data; - /* avail_in is set below from 'size' */ - png_ptr->zstream.avail_in = 0; +static png_bytep +png_read_buffer(png_structrp png_ptr, png_alloc_size_t new_size, int warn) +{ + png_bytep buffer = png_ptr->read_buffer; - while (1) + if (buffer != NULL && new_size > png_ptr->read_buffer_size) { - int ret, avail; + png_ptr->read_buffer = NULL; + png_ptr->read_buffer = NULL; + png_ptr->read_buffer_size = 0; + png_free(png_ptr, buffer); + buffer = NULL; + } - /* The setting of 'avail_in' used to be outside the loop; by setting it - * inside it is possible to chunk the input to zlib and simply rely on - * zlib to advance the 'next_in' pointer. This allows arbitrary amounts o - * data to be passed through zlib at the unavoidable cost of requiring a - * window save (memcpy of up to 32768 output bytes) every ZLIB_IO_MAX - * input bytes. - */ - if (png_ptr->zstream.avail_in == 0 && size > 0) + if (buffer == NULL) { - if (size <= ZLIB_IO_MAX) + buffer = png_voidcast(png_bytep, png_malloc_base(png_ptr, new_size)); + + if (buffer != NULL) { - /* The value is less than ZLIB_IO_MAX so the cast is safe: */ - png_ptr->zstream.avail_in = (uInt)size; - size = 0; + png_ptr->read_buffer = buffer; + png_ptr->read_buffer_size = new_size; } + else if (warn < 2) /* else silent */ + { +#ifdef PNG_WARNINGS_SUPPORTED + if (warn) + png_chunk_warning(png_ptr, "insufficient memory to read chunk"); else +#endif { - png_ptr->zstream.avail_in = ZLIB_IO_MAX; - size -= ZLIB_IO_MAX; +#ifdef PNG_ERROR_TEXT_SUPPORTED + png_chunk_error(png_ptr, "insufficient memory to read chunk"); +#endif + } + } } + + return buffer; } - /* Reset the output buffer each time round - we empty it - * after every inflate call. +/* png_inflate_claim: claim the zstream for some nefarious purpose that involves + * decompression. Returns Z_OK on success, else a zlib error code. It checks + * the owner but, in final release builds, just issues a warning if some other + * chunk apparently owns the stream. Prior to release it does a png_error. */ - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = png_ptr->zbuf_size; +static int +png_inflate_claim(png_structrp png_ptr, png_uint_32 owner, int window_bits) +{ + if (png_ptr->zowner != 0) + { + char msg[64]; - ret = inflate(&png_ptr->zstream, Z_NO_FLUSH); - avail = png_ptr->zbuf_size - png_ptr->zstream.avail_out; + PNG_STRING_FROM_CHUNK(msg, png_ptr->zowner); + /* So the message that results is " using zstream"; this is an + * internal error, but is very useful for debugging. i18n requirements + * are minimal. + */ + (void)png_safecat(msg, (sizeof msg), 4, " using zstream"); +# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC + png_chunk_warning(png_ptr, msg); + png_ptr->zowner = 0; +# else + png_chunk_error(png_ptr, msg); +# endif + } - /* First copy/count any new output - but only if we didn't - * get an error code. + /* Implementation note: unlike 'png_deflate_claim' this internal function + * does not take the size of the data as an argument. Some efficiency could + * be gained by using this when it is known *if* the zlib stream itself does + * not record the number; however, this is an illusion: the original writer + * follow of the PNG may have selected a lower window size, and we really + * must do that because, for systems with with limited capabilities, we + * would otherwise reject the application's attempts to use a smaller window + * size (zlib doesn't have an interface to say "this or lower"!). + * + * inflateReset2 was added to zlib 1.2.4; before this the window could not be + * reset, therefore it is necessary to always allocate the maximum window + * size with earlier zlibs just in case later compressed chunks need it. */ - if ((ret == Z_OK || ret == Z_STREAM_END) && avail > 0) { - png_size_t space = avail; /* > 0, see above */ + int ret; /* zlib return code */ - if (output != 0 && output_size > count) + /* Set this for safety, just in case the previous owner left pointers to + * memory allocations. + */ + png_ptr->zstream.next_in = NULL; + png_ptr->zstream.avail_in = 0; + png_ptr->zstream.next_out = NULL; + png_ptr->zstream.avail_out = 0; + + if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) { - png_size_t copy = output_size - count; +# if ZLIB_VERNUM < 0x1240 + PNG_UNUSED(window_bits) + ret = inflateReset(&png_ptr->zstream); +# else + ret = inflateReset2(&png_ptr->zstream, window_bits); +# endif + } - if (space < copy) - copy = space; + else + { +# if ZLIB_VERNUM < 0x1240 + ret = inflateInit(&png_ptr->zstream); +# else + ret = inflateInit2(&png_ptr->zstream, window_bits); +# endif - png_memcpy(output + count, png_ptr->zbuf, copy); - } - count += space; + if (ret == Z_OK) + png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED; } if (ret == Z_OK) - continue; + png_ptr->zowner = owner; + + else + png_zstream_error(png_ptr, ret); + + return ret; + } +} - /* Termination conditions - always reset the zstream, it - * must be left in inflateInit state. +#ifdef PNG_READ_COMPRESSED_TEXT_SUPPORTED +/* png_inflate now returns zlib error codes including Z_OK and Z_STREAM_END to + * allow the caller to do multiple calls if required. If the 'finish' flag is + * set Z_FINISH will be passed to the final inflate() call and Z_STREAM_END must + * be returned or there has been a problem, otherwise Z_SYNC_FLUSH is used and + * Z_OK or Z_STREAM_END will be returned on success. + * + * The input and output sizes are updated to the actual amounts of data consumed + * or written, not the amount available (as in a z_stream). The data pointers + * are not changed, so the next input is (data+input_size) and the next + * available output is (output+output_size). + */ +static int +png_inflate(png_structrp png_ptr, png_uint_32 owner, int finish, + /* INPUT: */ png_const_bytep input, png_uint_32p input_size_ptr, + /* OUTPUT: */ png_bytep output, png_alloc_size_t *output_size_ptr) +{ + if (png_ptr->zowner == owner) /* Else not claimed */ + { + int ret; + png_alloc_size_t avail_out = *output_size_ptr; + png_uint_32 avail_in = *input_size_ptr; + + /* zlib can't necessarily handle more than 65535 bytes at once (i.e. it + * can't even necessarily handle 65536 bytes) because the type uInt is + * "16 bits or more". Consequently it is necessary to chunk the input to + * zlib. This code uses ZLIB_IO_MAX, from pngpriv.h, as the maximum (the + * maximum value that can be stored in a uInt.) It is possible to set + * ZLIB_IO_MAX to a lower value in pngpriv.h and this may sometimes have + * a performance advantage, because it reduces the amount of data accessed + * at each step and that may give the OS more time to page it in. */ + png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input); + /* avail_in and avail_out are set below from 'size' */ png_ptr->zstream.avail_in = 0; - inflateReset(&png_ptr->zstream); - - if (ret == Z_STREAM_END) - return count; /* NOTE: may be zero. */ + png_ptr->zstream.avail_out = 0; - /* Now handle the error codes - the API always returns 0 - * and the error message is dumped into the uncompressed - * buffer if available. + /* Read directly into the output if it is available (this is set to + * a local buffer below if output is NULL). */ -# ifdef PNG_WARNINGS_SUPPORTED + if (output != NULL) + png_ptr->zstream.next_out = output; + + do { - png_const_charp msg; + uInt avail; + Byte local_buffer[PNG_INFLATE_BUF_SIZE]; + + /* zlib INPUT BUFFER */ + /* The setting of 'avail_in' used to be outside the loop; by setting it + * inside it is possible to chunk the input to zlib and simply rely on + * zlib to advance the 'next_in' pointer. This allows arbitrary + * amounts of data to be passed through zlib at the unavoidable cost of + * requiring a window save (memcpy of up to 32768 output bytes) + * every ZLIB_IO_MAX input bytes. + */ + avail_in += png_ptr->zstream.avail_in; /* not consumed last time */ - if (png_ptr->zstream.msg != 0) - msg = png_ptr->zstream.msg; + avail = ZLIB_IO_MAX; - else switch (ret) - { - case Z_BUF_ERROR: - msg = "Buffer error in compressed datastream"; - break; + if (avail_in < avail) + avail = (uInt)avail_in; /* safe: < than ZLIB_IO_MAX */ - case Z_DATA_ERROR: - msg = "Data error in compressed datastream"; - break; + avail_in -= avail; + png_ptr->zstream.avail_in = avail; - default: - msg = "Incomplete compressed datastream"; - break; + /* zlib OUTPUT BUFFER */ + avail_out += png_ptr->zstream.avail_out; /* not written last time */ + + avail = ZLIB_IO_MAX; /* maximum zlib can process */ + + if (output == NULL) + { + /* Reset the output buffer each time round if output is NULL and + * make available the full buffer, up to 'remaining_space' + */ + png_ptr->zstream.next_out = local_buffer; + if ((sizeof local_buffer) < avail) + avail = (sizeof local_buffer); } - png_chunk_warning(png_ptr, msg); + if (avail_out < avail) + avail = (uInt)avail_out; /* safe: < ZLIB_IO_MAX */ + + png_ptr->zstream.avail_out = avail; + avail_out -= avail; + + /* zlib inflate call */ + /* In fact 'avail_out' may be 0 at this point, that happens at the end + * of the read when the final LZ end code was not passed at the end of + * the previous chunk of input data. Tell zlib if we have reached the + * end of the output buffer. + */ + ret = inflate(&png_ptr->zstream, avail_out > 0 ? Z_NO_FLUSH : + (finish ? Z_FINISH : Z_SYNC_FLUSH)); + } while (ret == Z_OK); + + /* For safety kill the local buffer pointer now */ + if (output == NULL) + png_ptr->zstream.next_out = NULL; + + /* Claw back the 'size' and 'remaining_space' byte counts. */ + avail_in += png_ptr->zstream.avail_in; + avail_out += png_ptr->zstream.avail_out; + + /* Update the input and output sizes; the updated values are the amount + * consumed or written, effectively the inverse of what zlib uses. + */ + if (avail_out > 0) + *output_size_ptr -= avail_out; + + if (avail_in > 0) + *input_size_ptr -= avail_in; + + /* Ensure png_ptr->zstream.msg is set (even in the success case!) */ + png_zstream_error(png_ptr, ret); + return ret; } -# endif - /* 0 means an error - notice that this code simply ignores - * zero length compressed chunks as a result. + else + { + /* This is a bad internal error. The recovery assigns to the zstream msg + * pointer, which is not owned by the caller, but this is safe; it's only + * used on errors! */ - return 0; + png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed"); + return Z_STREAM_ERROR; } } /* - * Decompress trailing data in a chunk. The assumption is that chunkdata + * Decompress trailing data in a chunk. The assumption is that read_buffer * points at an allocated area holding the contents of a chunk with a * trailing compressed part. What we get back is an allocated area * holding the original prefix part and an uncompressed version of the * trailing part (the malloc area passed in is freed). */ -void /* PRIVATE */ -png_decompress_chunk(png_structp png_ptr, int comp_type, - png_size_t chunklength, - png_size_t prefix_size, png_size_t *newlength) -{ - /* The caller should guarantee this */ - if (prefix_size > chunklength) +static int +png_decompress_chunk(png_structrp png_ptr, + png_uint_32 chunklength, png_uint_32 prefix_size, + png_alloc_size_t *newlength /* must be initialized to the maximum! */, + int terminate /*add a '\0' to the end of the uncompressed data*/) { - /* The recovery is to delete the chunk. */ - png_warning(png_ptr, "invalid chunklength"); - prefix_size = 0; /* To delete everything */ - } + /* TODO: implement different limits for different types of chunk. + * + * The caller supplies *newlength set to the maximum length of the + * uncompressed data, but this routine allocates space for the prefix and + * maybe a '\0' terminator too. We have to assume that 'prefix_size' is + * limited only by the maximum chunk size. + */ + png_alloc_size_t limit = PNG_SIZE_MAX; + +# ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED + if (png_ptr->user_chunk_malloc_max > 0 && + png_ptr->user_chunk_malloc_max < limit) + limit = png_ptr->user_chunk_malloc_max; +# elif PNG_USER_CHUNK_MALLOC_MAX > 0 + if (PNG_USER_CHUNK_MALLOC_MAX < limit) + limit = PNG_USER_CHUNK_MALLOC_MAX; +# endif - else if (comp_type == PNG_COMPRESSION_TYPE_BASE) + if (limit >= prefix_size + (terminate != 0)) { - png_size_t expanded_size = png_inflate(png_ptr, - (png_bytep)(png_ptr->chunkdata + prefix_size), - chunklength - prefix_size, - 0, /* output */ - 0); /* output size */ + int ret; + + limit -= prefix_size + (terminate != 0); + + if (limit < *newlength) + *newlength = limit; - /* Now check the limits on this chunk - if the limit fails the - * compressed data will be removed, the prefix will remain. + /* Now try to claim the stream; the 'warn' setting causes zlib to be told + * to use the maximum window size during inflate; this hides errors in the + * deflate header window bits value which is used if '0' is passed. In + * fact this only has an effect with zlib versions 1.2.4 and later - see + * the comments in png_inflate_claim above. */ - if (prefix_size >= (~(png_size_t)0) - 1 || - expanded_size >= (~(png_size_t)0) - 1 - prefix_size -#ifdef PNG_USER_LIMITS_SUPPORTED - || (png_ptr->user_chunk_malloc_max && - (prefix_size + expanded_size >= png_ptr->user_chunk_malloc_max - 1)) -#else - || ((PNG_USER_CHUNK_MALLOC_MAX > 0) && - prefix_size + expanded_size >= PNG_USER_CHUNK_MALLOC_MAX - 1) -#endif - ) - png_warning(png_ptr, "Exceeded size limit while expanding chunk"); + ret = png_inflate_claim(png_ptr, png_ptr->chunk_name, + png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN ? 15 : 0); + + if (ret == Z_OK) + { + png_uint_32 lzsize = chunklength - prefix_size; - /* If the size is zero either there was an error and a message - * has already been output (warning) or the size really is zero - * and we have nothing to do - the code will exit through the - * error case below. - */ - else if (expanded_size > 0) - { - /* Success (maybe) - really uncompress the chunk. */ - png_size_t new_size = 0; - png_charp text = (png_charp)png_malloc_warn(png_ptr, - prefix_size + expanded_size + 1); + ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/, + /* input: */ png_ptr->read_buffer + prefix_size, &lzsize, + /* output: */ NULL, newlength); + + if (ret == Z_STREAM_END) + { + /* Use 'inflateReset' here, not 'inflateReset2' because this + * preserves the previously decided window size (otherwise it would + * be necessary to store the previous window size.) In practice + * this doesn't matter anyway, because png_inflate will call inflate + * with Z_FINISH in almost all cases, so the window will not be + * maintained. + */ + if (inflateReset(&png_ptr->zstream) == Z_OK) + { + /* Because of the limit checks above we know that the new, + * expanded, size will fit in a size_t (let alone an + * png_alloc_size_t). Use png_malloc_base here to avoid an + * extra OOM message. + */ + png_alloc_size_t new_size = *newlength; + png_alloc_size_t buffer_size = prefix_size + new_size + + (terminate != 0); + png_bytep text = png_voidcast(png_bytep, png_malloc_base(png_ptr, + buffer_size)); if (text != NULL) { - png_memcpy(text, png_ptr->chunkdata, prefix_size); - new_size = png_inflate(png_ptr, - (png_bytep)(png_ptr->chunkdata + prefix_size), - chunklength - prefix_size, - (png_bytep)(text + prefix_size), expanded_size); - text[prefix_size + expanded_size] = 0; /* just in case */ - - if (new_size == expanded_size) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = text; - *newlength = prefix_size + expanded_size; - return; /* The success return! */ + ret = png_inflate(png_ptr, png_ptr->chunk_name, 1/*finish*/, + png_ptr->read_buffer + prefix_size, &lzsize, + text + prefix_size, newlength); + + if (ret == Z_STREAM_END) + { + if (new_size == *newlength) + { + if (terminate) + text[prefix_size + *newlength] = 0; + + if (prefix_size > 0) + memcpy(text, png_ptr->read_buffer, prefix_size); + + { + png_bytep old_ptr = png_ptr->read_buffer; + + png_ptr->read_buffer = text; + png_ptr->read_buffer_size = buffer_size; + text = old_ptr; /* freed below */ + } } - png_warning(png_ptr, "png_inflate logic error"); + else + { + /* The size changed on the second read, there can be no + * guarantee that anything is correct at this point. + * The 'msg' pointer has been set to "unexpected end of + * LZ stream", which is fine, but return an error code + * that the caller won't accept. + */ + ret = PNG_UNEXPECTED_ZLIB_RETURN; + } + } + + else if (ret == Z_OK) + ret = PNG_UNEXPECTED_ZLIB_RETURN; /* for safety */ + + /* Free the text pointer (this is the old read_buffer on + * success) + */ png_free(png_ptr, text); + + /* This really is very benign, but it's still an error because + * the extra space may otherwise be used as a Trojan Horse. + */ + if (ret == Z_STREAM_END && + chunklength - prefix_size != lzsize) + png_chunk_benign_error(png_ptr, "extra compressed data"); } else - png_warning(png_ptr, "Not enough memory to decompress chunk"); + { + /* Out of memory allocating the buffer */ + ret = Z_MEM_ERROR; + png_zstream_error(png_ptr, Z_MEM_ERROR); } } - else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */ + else { - PNG_WARNING_PARAMETERS(p) - png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d, comp_type); - png_formatted_warning(png_ptr, p, "Unknown compression type @1"); + /* inflateReset failed, store the error message */ + png_zstream_error(png_ptr, ret); - /* The recovery is to simply drop the data. */ + if (ret == Z_STREAM_END) + ret = PNG_UNEXPECTED_ZLIB_RETURN; + } + } + + else if (ret == Z_OK) + ret = PNG_UNEXPECTED_ZLIB_RETURN; + + /* Release the claimed stream */ + png_ptr->zowner = 0; + } + + else /* the claim failed */ if (ret == Z_STREAM_END) /* impossible! */ + ret = PNG_UNEXPECTED_ZLIB_RETURN; + + return ret; } - /* Generic error return - leave the prefix, delete the compressed - * data, reallocate the chunkdata to remove the potentially large - * amount of compressed data. + else + { + /* Application/configuration limits exceeded */ + png_zstream_error(png_ptr, Z_MEM_ERROR); + return Z_MEM_ERROR; + } +} +#endif /* PNG_READ_COMPRESSED_TEXT_SUPPORTED */ + +#ifdef PNG_READ_iCCP_SUPPORTED +/* Perform a partial read and decompress, producing 'avail_out' bytes and + * reading from the current chunk as required. */ +static int +png_inflate_read(png_structrp png_ptr, png_bytep read_buffer, uInt read_size, + png_uint_32p chunk_bytes, png_bytep next_out, png_alloc_size_t *out_size, + int finish) +{ + if (png_ptr->zowner == png_ptr->chunk_name) { - png_charp text = (png_charp)png_malloc_warn(png_ptr, prefix_size + 1); + int ret; - if (text != NULL) + /* next_in and avail_in must have been initialized by the caller. */ + png_ptr->zstream.next_out = next_out; + png_ptr->zstream.avail_out = 0; /* set in the loop */ + + do { - if (prefix_size > 0) - png_memcpy(text, png_ptr->chunkdata, prefix_size); + if (png_ptr->zstream.avail_in == 0) + { + if (read_size > *chunk_bytes) + read_size = (uInt)*chunk_bytes; + *chunk_bytes -= read_size; + + if (read_size > 0) + png_crc_read(png_ptr, read_buffer, read_size); + + png_ptr->zstream.next_in = read_buffer; + png_ptr->zstream.avail_in = read_size; + } - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = text; + if (png_ptr->zstream.avail_out == 0) + { + uInt avail = ZLIB_IO_MAX; + if (avail > *out_size) + avail = (uInt)*out_size; + *out_size -= avail; - /* This is an extra zero in the 'uncompressed' part. */ - *(png_ptr->chunkdata + prefix_size) = 0x00; + png_ptr->zstream.avail_out = avail; } - /* Ignore a malloc error here - it is safe. */ + + /* Use Z_SYNC_FLUSH when there is no more chunk data to ensure that all + * the available output is produced; this allows reading of truncated + * streams. + */ + ret = inflate(&png_ptr->zstream, + *chunk_bytes > 0 ? Z_NO_FLUSH : (finish ? Z_FINISH : Z_SYNC_FLUSH)); } + while (ret == Z_OK && (*out_size > 0 || png_ptr->zstream.avail_out > 0)); - *newlength = prefix_size; + *out_size += png_ptr->zstream.avail_out; + png_ptr->zstream.avail_out = 0; /* Should not be required, but is safe */ + + /* Ensure the error message pointer is always set: */ + png_zstream_error(png_ptr, ret); + return ret; } -#endif /* PNG_READ_COMPRESSED_TEXT_SUPPORTED */ + + else + { + png_ptr->zstream.msg = PNGZ_MSG_CAST("zstream unclaimed"); + return Z_STREAM_ERROR; + } +} +#endif /* Read and check the IDHR chunk */ void /* PRIVATE */ -png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_IHDR(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[13]; png_uint_32 width, height; int bit_depth, color_type, compression_type, filter_type; @@ -527,13 +790,13 @@ png_debug(1, "in png_handle_IHDR"); if (png_ptr->mode & PNG_HAVE_IHDR) - png_error(png_ptr, "Out of place IHDR"); + png_chunk_error(png_ptr, "out of place"); /* Check the length */ if (length != 13) - png_error(png_ptr, "Invalid IHDR chunk"); + png_chunk_error(png_ptr, "invalid"); png_ptr->mode |= PNG_HAVE_IHDR; png_crc_read(png_ptr, buf, 13); @@ -592,9 +855,9 @@ } /* Read and check the palette */ void /* PRIVATE */ -png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_color palette[PNG_MAX_PALETTE_LENGTH]; int num, i; #ifdef PNG_POINTER_INDEXING_SUPPORTED @@ -603,27 +866,34 @@ png_debug(1, "in png_handle_PLTE"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before PLTE"); + png_chunk_error(png_ptr, "missing IHDR"); + + /* Moved to before the 'after IDAT' check below because otherwise duplicate + * PLTE chunks are potentially ignored (the spec says there shall not be more + * than one PLTE, the error is not treated as benign, so this check trumps + * the requirement that PLTE appears before IDAT.) + */ + else if (png_ptr->mode & PNG_HAVE_PLTE) + png_chunk_error(png_ptr, "duplicate"); else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid PLTE after IDAT"); + /* This is benign because the non-benign error happened before, when an + * IDAT was encountered in a color-mapped image with no PLTE. + */ png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } - else if (png_ptr->mode & PNG_HAVE_PLTE) - png_error(png_ptr, "Duplicate PLTE chunk"); - png_ptr->mode |= PNG_HAVE_PLTE; if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR)) { - png_warning(png_ptr, - "Ignoring PLTE chunk in grayscale PNG"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "ignored in grayscale PNG"); return; } #ifndef PNG_READ_OPT_PLTE_SUPPORTED @@ -635,21 +905,20 @@ #endif if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3) { - if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) - { - png_warning(png_ptr, "Invalid palette chunk"); png_crc_finish(png_ptr, length); - return; - } + + if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE) + png_chunk_benign_error(png_ptr, "invalid"); else - { - png_error(png_ptr, "Invalid palette chunk"); - } + png_chunk_error(png_ptr, "invalid"); + + return; } + /* The cast is safe because 'length' is less than 3*PNG_MAX_PALETTE_LENGTH */ num = (int)length / 3; #ifdef PNG_POINTER_INDEXING_SUPPORTED for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++) @@ -692,8 +961,12 @@ /* If we don't want to use the data from an ancillary chunk, * we have two options: an error abort, or a warning and we * ignore the data in this chunk (which should be OK, since * it's considered ancillary for a RGB or RGBA image). + * + * IMPLEMENTATION NOTE: this is only here because png_crc_finish uses the + * chunk type to determine whether to check the ancillary or the critical + * flags. */ if (!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_USE)) { if (png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN) @@ -715,92 +988,96 @@ } } #endif + /* TODO: png_set_PLTE has the side effect of setting png_ptr->palette to its + * own copy of the palette. This has the side effect that when png_start_row + * is called (this happens after any call to png_read_update_info) the + * info_ptr palette gets changed. This is extremely unexpected and + * confusing. + * + * Fix this by not sharing the palette in this way. + */ png_set_PLTE(png_ptr, info_ptr, palette, num); + /* The three chunks, bKGD, hIST and tRNS *must* appear after PLTE and before + * IDAT. Prior to 1.6.0 this was not checked; instead the code merely + * checked the apparent validity of a tRNS chunk inserted before PLTE on a + * palette PNG. 1.6.0 attempts to rigorously follow the standard and + * therefore does a benign error if the erroneous condition is detected *and* + * cancels the tRNS if the benign error returns. The alternative is to + * amend the standard since it would be rather hypocritical of the standards + * maintainers to ignore it. + */ #ifdef PNG_READ_tRNS_SUPPORTED - if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) - { - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) + if (png_ptr->num_trans > 0 || + (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS) != 0)) { - if (png_ptr->num_trans > (png_uint_16)num) - { - png_warning(png_ptr, "Truncating incorrect tRNS chunk length"); - png_ptr->num_trans = (png_uint_16)num; - } + /* Cancel this because otherwise it would be used if the transforms + * require it. Don't cancel the 'valid' flag because this would prevent + * detection of duplicate chunks. + */ + png_ptr->num_trans = 0; - if (info_ptr->num_trans > (png_uint_16)num) - { - png_warning(png_ptr, "Truncating incorrect info tRNS chunk length"); - info_ptr->num_trans = (png_uint_16)num; - } - } + if (info_ptr != NULL) + info_ptr->num_trans = 0; + + png_chunk_benign_error(png_ptr, "tRNS must be after"); } #endif +#ifdef PNG_READ_hIST_SUPPORTED + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST) != 0) + png_chunk_benign_error(png_ptr, "hIST must be after"); +#endif + +#ifdef PNG_READ_bKGD_SUPPORTED + if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD) != 0) + png_chunk_benign_error(png_ptr, "bKGD must be after"); +#endif } void /* PRIVATE */ -png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_IEND(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_debug(1, "in png_handle_IEND"); if (!(png_ptr->mode & PNG_HAVE_IHDR) || !(png_ptr->mode & PNG_HAVE_IDAT)) - { - png_error(png_ptr, "No image in file"); - } + png_chunk_error(png_ptr, "out of place"); png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND); - if (length != 0) - { - png_warning(png_ptr, "Incorrect IEND chunk length"); - } - png_crc_finish(png_ptr, length); - PNG_UNUSED(info_ptr) /* Quiet compiler warnings about unused info_ptr */ + if (length != 0) + png_chunk_benign_error(png_ptr, "invalid"); + + PNG_UNUSED(info_ptr) } #ifdef PNG_READ_gAMA_SUPPORTED void /* PRIVATE */ -png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_gAMA(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_fixed_point igamma; png_byte buf[4]; png_debug(1, "in png_handle_gAMA"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before gAMA"); + png_chunk_error(png_ptr, "missing IHDR"); - else if (png_ptr->mode & PNG_HAVE_IDAT) - { - png_warning(png_ptr, "Invalid gAMA after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - - else if (png_ptr->mode & PNG_HAVE_PLTE) - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place gAMA chunk"); - - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA) -#ifdef PNG_READ_sRGB_SUPPORTED - && !(info_ptr->valid & PNG_INFO_sRGB) -#endif - ) + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Duplicate gAMA chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } if (length != 4) { - png_warning(png_ptr, "Incorrect gAMA chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 4); @@ -809,83 +1086,50 @@ return; igamma = png_get_fixed_point(NULL, buf); - /* Check for zero gamma or an error. */ - if (igamma <= 0) - { - png_warning(png_ptr, - "Ignoring gAMA chunk with out of range gamma"); - - return; - } - -# ifdef PNG_READ_sRGB_SUPPORTED - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) - { - if (PNG_OUT_OF_RANGE(igamma, 45500, 500)) - { - PNG_WARNING_PARAMETERS(p) - png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed, igamma); - png_formatted_warning(png_ptr, p, - "Ignoring incorrect gAMA value @1 when sRGB is also present"); - return; - } - } -# endif /* PNG_READ_sRGB_SUPPORTED */ - -# ifdef PNG_READ_GAMMA_SUPPORTED - /* Gamma correction on read is supported. */ - png_ptr->gamma = igamma; -# endif - /* And set the 'info' structure members. */ - png_set_gAMA_fixed(png_ptr, info_ptr, igamma); + png_colorspace_set_gamma(png_ptr, &png_ptr->colorspace, igamma); + png_colorspace_sync(png_ptr, info_ptr); } #endif #ifdef PNG_READ_sBIT_SUPPORTED void /* PRIVATE */ -png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_sBIT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_size_t truelen; + unsigned int truelen; png_byte buf[4]; png_debug(1, "in png_handle_sBIT"); buf[0] = buf[1] = buf[2] = buf[3] = 0; if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before sBIT"); + png_chunk_error(png_ptr, "missing IHDR"); - else if (png_ptr->mode & PNG_HAVE_IDAT) + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Invalid sBIT after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } - else if (png_ptr->mode & PNG_HAVE_PLTE) - { - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place sBIT chunk"); - } - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)) { - png_warning(png_ptr, "Duplicate sBIT chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) truelen = 3; else - truelen = (png_size_t)png_ptr->channels; + truelen = png_ptr->channels; if (length != truelen || length > 4) { - png_warning(png_ptr, "Incorrect sBIT chunk length"); + png_chunk_benign_error(png_ptr, "invalid"); png_crc_finish(png_ptr, length); return; } @@ -916,469 +1160,413 @@ #endif #ifdef PNG_READ_cHRM_SUPPORTED void /* PRIVATE */ -png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_cHRM(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[32]; - png_fixed_point x_white, y_white, x_red, y_red, x_green, y_green, x_blue, - y_blue; + png_xy xy; png_debug(1, "in png_handle_cHRM"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before cHRM"); + png_chunk_error(png_ptr, "missing IHDR"); - else if (png_ptr->mode & PNG_HAVE_IDAT) + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Invalid cHRM after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - - else if (png_ptr->mode & PNG_HAVE_PLTE) - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place cHRM chunk"); - - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM) -# ifdef PNG_READ_sRGB_SUPPORTED - && !(info_ptr->valid & PNG_INFO_sRGB) -# endif - ) - { - png_warning(png_ptr, "Duplicate cHRM chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } if (length != 32) { - png_warning(png_ptr, "Incorrect cHRM chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 32); if (png_crc_finish(png_ptr, 0)) return; - x_white = png_get_fixed_point(NULL, buf); - y_white = png_get_fixed_point(NULL, buf + 4); - x_red = png_get_fixed_point(NULL, buf + 8); - y_red = png_get_fixed_point(NULL, buf + 12); - x_green = png_get_fixed_point(NULL, buf + 16); - y_green = png_get_fixed_point(NULL, buf + 20); - x_blue = png_get_fixed_point(NULL, buf + 24); - y_blue = png_get_fixed_point(NULL, buf + 28); - - if (x_white == PNG_FIXED_ERROR || - y_white == PNG_FIXED_ERROR || - x_red == PNG_FIXED_ERROR || - y_red == PNG_FIXED_ERROR || - x_green == PNG_FIXED_ERROR || - y_green == PNG_FIXED_ERROR || - x_blue == PNG_FIXED_ERROR || - y_blue == PNG_FIXED_ERROR) + xy.whitex = png_get_fixed_point(NULL, buf); + xy.whitey = png_get_fixed_point(NULL, buf + 4); + xy.redx = png_get_fixed_point(NULL, buf + 8); + xy.redy = png_get_fixed_point(NULL, buf + 12); + xy.greenx = png_get_fixed_point(NULL, buf + 16); + xy.greeny = png_get_fixed_point(NULL, buf + 20); + xy.bluex = png_get_fixed_point(NULL, buf + 24); + xy.bluey = png_get_fixed_point(NULL, buf + 28); + + if (xy.whitex == PNG_FIXED_ERROR || + xy.whitey == PNG_FIXED_ERROR || + xy.redx == PNG_FIXED_ERROR || + xy.redy == PNG_FIXED_ERROR || + xy.greenx == PNG_FIXED_ERROR || + xy.greeny == PNG_FIXED_ERROR || + xy.bluex == PNG_FIXED_ERROR || + xy.bluey == PNG_FIXED_ERROR) { - png_warning(png_ptr, "Ignoring cHRM chunk with negative chromaticities"); + png_chunk_benign_error(png_ptr, "invalid values"); return; } -#ifdef PNG_READ_sRGB_SUPPORTED - if ((info_ptr != NULL) && (info_ptr->valid & PNG_INFO_sRGB)) + /* If a colorspace error has already been output skip this chunk */ + if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) + return; + + if (png_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) { - if (PNG_OUT_OF_RANGE(x_white, 31270, 1000) || - PNG_OUT_OF_RANGE(y_white, 32900, 1000) || - PNG_OUT_OF_RANGE(x_red, 64000, 1000) || - PNG_OUT_OF_RANGE(y_red, 33000, 1000) || - PNG_OUT_OF_RANGE(x_green, 30000, 1000) || - PNG_OUT_OF_RANGE(y_green, 60000, 1000) || - PNG_OUT_OF_RANGE(x_blue, 15000, 1000) || - PNG_OUT_OF_RANGE(y_blue, 6000, 1000)) - { - PNG_WARNING_PARAMETERS(p) - - png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed, x_white); - png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_fixed, y_white); - png_warning_parameter_signed(p, 3, PNG_NUMBER_FORMAT_fixed, x_red); - png_warning_parameter_signed(p, 4, PNG_NUMBER_FORMAT_fixed, y_red); - png_warning_parameter_signed(p, 5, PNG_NUMBER_FORMAT_fixed, x_green); - png_warning_parameter_signed(p, 6, PNG_NUMBER_FORMAT_fixed, y_green); - png_warning_parameter_signed(p, 7, PNG_NUMBER_FORMAT_fixed, x_blue); - png_warning_parameter_signed(p, 8, PNG_NUMBER_FORMAT_fixed, y_blue); - - png_formatted_warning(png_ptr, p, - "Ignoring incorrect cHRM white(@1,@2) r(@3,@4)g(@5,@6)b(@7,@8) " - "when sRGB is also present"); - } + png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; + png_colorspace_sync(png_ptr, info_ptr); + png_chunk_benign_error(png_ptr, "duplicate"); return; } -#endif /* PNG_READ_sRGB_SUPPORTED */ -#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED - /* Store the _white values as default coefficients for the rgb to gray - * operation if it is supported. Check if the transform is already set to - * avoid destroying the transform values. - */ - if (!png_ptr->rgb_to_gray_coefficients_set) + png_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; + (void)png_colorspace_set_chromaticities(png_ptr, &png_ptr->colorspace, &xy, + 1/*prefer cHRM values*/); + png_colorspace_sync(png_ptr, info_ptr); +} +#endif + +#ifdef PNG_READ_sRGB_SUPPORTED +void /* PRIVATE */ +png_handle_sRGB(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - /* png_set_background has not been called and we haven't seen an sRGB - * chunk yet. Find the XYZ of the three end points. - */ - png_XYZ XYZ; - png_xy xy; + png_byte intent; + + png_debug(1, "in png_handle_sRGB"); - xy.redx = x_red; - xy.redy = y_red; - xy.greenx = x_green; - xy.greeny = y_green; - xy.bluex = x_blue; - xy.bluey = y_blue; - xy.whitex = x_white; - xy.whitey = y_white; + if (!(png_ptr->mode & PNG_HAVE_IHDR)) + png_chunk_error(png_ptr, "missing IHDR"); - if (png_XYZ_from_xy_checked(png_ptr, &XYZ, xy)) - { - /* The success case, because XYZ_from_xy normalises to a reference - * white Y of 1.0 we just need to scale the numbers. This should - * always work just fine. It is an internal error if this overflows. - */ + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_fixed_point r, g, b; - if (png_muldiv(&r, XYZ.redY, 32768, PNG_FP_1) && - r >= 0 && r <= 32768 && - png_muldiv(&g, XYZ.greenY, 32768, PNG_FP_1) && - g >= 0 && g <= 32768 && - png_muldiv(&b, XYZ.blueY, 32768, PNG_FP_1) && - b >= 0 && b <= 32768 && - r+g+b <= 32769) - { - /* We allow 0 coefficients here. r+g+b may be 32769 if two or - * all of the coefficients were rounded up. Handle this by - * reducing the *largest* coefficient by 1; this matches the - * approach used for the default coefficients in pngrtran.c - */ - int add = 0; - - if (r+g+b > 32768) - add = -1; - else if (r+g+b < 32768) - add = 1; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); + return; + } - if (add != 0) + if (length != 1) { - if (g >= r && g >= b) - g += add; - else if (r >= g && r >= b) - r += add; - else - b += add; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); + return; } - /* Check for an internal error. */ - if (r+g+b != 32768) - png_error(png_ptr, - "internal error handling cHRM coefficients"); + png_crc_read(png_ptr, &intent, 1); - png_ptr->rgb_to_gray_red_coeff = (png_uint_16)r; - png_ptr->rgb_to_gray_green_coeff = (png_uint_16)g; - } + if (png_crc_finish(png_ptr, 0)) + return; + + /* If a colorspace error has already been output skip this chunk */ + if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) + return; - /* This is a png_error at present even though it could be ignored - - * it should never happen, but it is important that if it does, the - * bug is fixed. + /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect + * this. */ - else - png_error(png_ptr, "internal error handling cHRM->XYZ"); - } - } + if (png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) + { + png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; + png_colorspace_sync(png_ptr, info_ptr); + png_chunk_benign_error(png_ptr, "too many profiles"); + return; } -#endif - png_set_cHRM_fixed(png_ptr, info_ptr, x_white, y_white, x_red, y_red, - x_green, y_green, x_blue, y_blue); + (void)png_colorspace_set_sRGB(png_ptr, &png_ptr->colorspace, intent); + png_colorspace_sync(png_ptr, info_ptr); } -#endif +#endif /* PNG_READ_sRGB_SUPPORTED */ -#ifdef PNG_READ_sRGB_SUPPORTED +#ifdef PNG_READ_iCCP_SUPPORTED void /* PRIVATE */ -png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_iCCP(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) +/* Note: this does not properly handle profiles that are > 64K under DOS */ { - int intent; - png_byte buf[1]; + png_const_charp errmsg = NULL; /* error message output, or no error */ + int finished = 0; /* crc checked */ - png_debug(1, "in png_handle_sRGB"); + png_debug(1, "in png_handle_iCCP"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before sRGB"); + png_chunk_error(png_ptr, "missing IHDR"); - else if (png_ptr->mode & PNG_HAVE_IDAT) + else if (png_ptr->mode & (PNG_HAVE_IDAT|PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Invalid sRGB after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } - else if (png_ptr->mode & PNG_HAVE_PLTE) - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place sRGB chunk"); - - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)) + /* Consistent with all the above colorspace handling an obviously *invalid* + * chunk is just ignored, so does not invalidate the color space. An + * alternative is to set the 'invalid' flags at the start of this routine + * and only clear them in they were not set before and all the tests pass. + * The minimum 'deflate' stream is assumed to be just the 2 byte header and 4 + * byte checksum. The keyword must be one character and there is a + * terminator (0) byte and the compression method. + */ + if (length < 9) { - png_warning(png_ptr, "Duplicate sRGB chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "too short"); return; } - if (length != 1) + /* If a colorspace error has already been output skip this chunk */ + if (png_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) { - png_warning(png_ptr, "Incorrect sRGB chunk length"); png_crc_finish(png_ptr, length); return; } - png_crc_read(png_ptr, buf, 1); + /* Only one sRGB or iCCP chunk is allowed, use the HAVE_INTENT flag to detect + * this. + */ + if ((png_ptr->colorspace.flags & PNG_COLORSPACE_HAVE_INTENT) == 0) + { + uInt read_length, keyword_length; + char keyword[81]; - if (png_crc_finish(png_ptr, 0)) - return; + /* Find the keyword; the keyword plus separator and compression method + * bytes can be at most 81 characters long. + */ + read_length = 81; /* maximum */ + if (read_length > length) + read_length = (uInt)length; - intent = buf[0]; + png_crc_read(png_ptr, (png_bytep)keyword, read_length); + length -= read_length; - /* Check for bad intent */ - if (intent >= PNG_sRGB_INTENT_LAST) - { - png_warning(png_ptr, "Unknown sRGB intent"); - return; - } + keyword_length = 0; + while (keyword_length < 80 && keyword_length < read_length && + keyword[keyword_length] != 0) + ++keyword_length; -#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED) - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)) + /* TODO: make the keyword checking common */ + if (keyword_length >= 1 && keyword_length <= 79) { - if (PNG_OUT_OF_RANGE(info_ptr->gamma, 45500, 500)) + /* We only understand '0' compression - deflate - so if we get a + * different value we can't safely decode the chunk. + */ + if (keyword_length+1 < read_length && + keyword[keyword_length+1] == PNG_COMPRESSION_TYPE_BASE) { - PNG_WARNING_PARAMETERS(p) + read_length -= keyword_length+2; - png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_fixed, - info_ptr->gamma); + if (png_inflate_claim(png_ptr, png_iCCP, + png_ptr->flags & PNG_FLAG_BENIGN_ERRORS_WARN ? 15 : 0) == Z_OK) + { + Byte profile_header[132]; + Byte local_buffer[PNG_INFLATE_BUF_SIZE]; + png_alloc_size_t size = (sizeof profile_header); - png_formatted_warning(png_ptr, p, - "Ignoring incorrect gAMA value @1 when sRGB is also present"); - } - } -#endif /* PNG_READ_gAMA_SUPPORTED */ + png_ptr->zstream.next_in = (Bytef*)keyword + (keyword_length+2); + png_ptr->zstream.avail_in = read_length; + (void)png_inflate_read(png_ptr, local_buffer, + (sizeof local_buffer), &length, profile_header, &size, + 0/*finish: don't, because the output is too small*/); -#ifdef PNG_READ_cHRM_SUPPORTED - if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)) - if (PNG_OUT_OF_RANGE(info_ptr->x_white, 31270, 1000) || - PNG_OUT_OF_RANGE(info_ptr->y_white, 32900, 1000) || - PNG_OUT_OF_RANGE(info_ptr->x_red, 64000, 1000) || - PNG_OUT_OF_RANGE(info_ptr->y_red, 33000, 1000) || - PNG_OUT_OF_RANGE(info_ptr->x_green, 30000, 1000) || - PNG_OUT_OF_RANGE(info_ptr->y_green, 60000, 1000) || - PNG_OUT_OF_RANGE(info_ptr->x_blue, 15000, 1000) || - PNG_OUT_OF_RANGE(info_ptr->y_blue, 6000, 1000)) - { - png_warning(png_ptr, - "Ignoring incorrect cHRM value when sRGB is also present"); - } -#endif /* PNG_READ_cHRM_SUPPORTED */ - - /* This is recorded for use when handling the cHRM chunk above. An sRGB - * chunk unconditionally overwrites the coefficients for grayscale conversion - * too. - */ - png_ptr->is_sRGB = 1; - -# ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED - /* Don't overwrite user supplied values: */ - if (!png_ptr->rgb_to_gray_coefficients_set) - { - /* These numbers come from the sRGB specification (or, since one has to - * pay much money to get a copy, the wikipedia sRGB page) the - * chromaticity values quoted have been inverted to get the reverse - * transformation from RGB to XYZ and the 'Y' coefficients scaled by - * 32768 (then rounded). - * - * sRGB and ITU Rec-709 both truncate the values for the D65 white - * point to four digits and, even though it actually stores five - * digits, the PNG spec gives the truncated value. - * - * This means that when the chromaticities are converted back to XYZ - * end points we end up with (6968,23435,2366), which, as described in - * pngrtran.c, would overflow. If the five digit precision and up is - * used we get, instead: - * - * 6968*R + 23435*G + 2365*B - * - * (Notice that this rounds the blue coefficient down, rather than the - * choice used in pngrtran.c which is to round the green one down.) + if (size == 0) + { + /* We have the ICC profile header; do the basic header checks. */ - png_ptr->rgb_to_gray_red_coeff = 6968; /* 0.212639005871510 */ - png_ptr->rgb_to_gray_green_coeff = 23434; /* 0.715168678767756 */ - /* png_ptr->rgb_to_gray_blue_coeff = 2366; 0.072192315360734 */ + const png_uint_32 profile_length = + png_get_uint_32(profile_header); - /* The following keeps the cHRM chunk from destroying the - * coefficients again in the event that it follows the sRGB chunk. + if (png_icc_check_length(png_ptr, &png_ptr->colorspace, + keyword, profile_length)) + { + /* The length is apparently ok, so we can check the 132 + * byte header. */ - png_ptr->rgb_to_gray_coefficients_set = 1; - } -# endif - - png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent); -} -#endif /* PNG_READ_sRGB_SUPPORTED */ + if (png_icc_check_header(png_ptr, &png_ptr->colorspace, + keyword, profile_length, profile_header, + png_ptr->color_type)) + { + /* Now read the tag table; a variable size buffer is + * needed at this point, allocate one for the whole + * profile. The header check has already validated + * that none of these stuff will overflow. + */ + const png_uint_32 tag_count = png_get_uint_32( + profile_header+128); + png_bytep profile = png_read_buffer(png_ptr, + profile_length, 2/*silent*/); -#ifdef PNG_READ_iCCP_SUPPORTED -void /* PRIVATE */ -png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) -/* Note: this does not properly handle chunks that are > 64K under DOS */ + if (profile != NULL) { - png_byte compression_type; - png_bytep pC; - png_charp profile; - png_uint_32 skip = 0; - png_uint_32 profile_size; - png_alloc_size_t profile_length; - png_size_t slength, prefix_length, data_length; + memcpy(profile, profile_header, + (sizeof profile_header)); - png_debug(1, "in png_handle_iCCP"); + size = 12 * tag_count; - if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before iCCP"); + (void)png_inflate_read(png_ptr, local_buffer, + (sizeof local_buffer), &length, + profile + (sizeof profile_header), &size, 0); - else if (png_ptr->mode & PNG_HAVE_IDAT) + /* Still expect a a buffer error because we expect + * there to be some tag data! + */ + if (size == 0) { - png_warning(png_ptr, "Invalid iCCP after IDAT"); - png_crc_finish(png_ptr, length); - return; - } + if (png_icc_check_tag_table(png_ptr, + &png_ptr->colorspace, keyword, profile_length, + profile)) + { + /* The profile has been validated for basic + * security issues, so read the whole thing in. + */ + size = profile_length - (sizeof profile_header) + - 12 * tag_count; - else if (png_ptr->mode & PNG_HAVE_PLTE) - /* Should be an error, but we can cope with it */ - png_warning(png_ptr, "Out of place iCCP chunk"); + (void)png_inflate_read(png_ptr, local_buffer, + (sizeof local_buffer), &length, + profile + (sizeof profile_header) + + 12 * tag_count, &size, 1/*finish*/); + + if (length > 0 && !(png_ptr->flags & + PNG_FLAG_BENIGN_ERRORS_WARN)) + errmsg = "extra compressed data"; - if ((png_ptr->mode & PNG_HAVE_iCCP) || (info_ptr != NULL && - (info_ptr->valid & (PNG_INFO_iCCP|PNG_INFO_sRGB)))) + /* But otherwise allow extra data: */ + else if (size == 0) { - png_warning(png_ptr, "Duplicate iCCP chunk"); - png_crc_finish(png_ptr, length); - return; + if (length > 0) + { + /* This can be handled completely, so + * keep going. + */ + png_chunk_warning(png_ptr, + "extra compressed data"); } - png_ptr->mode |= PNG_HAVE_iCCP; + png_crc_finish(png_ptr, length); + finished = 1; -#ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "iCCP chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; - } +# ifdef PNG_sRGB_SUPPORTED + /* Check for a match against sRGB */ + png_icc_set_sRGB(png_ptr, + &png_ptr->colorspace, profile, + png_ptr->zstream.adler); #endif - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1); - slength = length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + /* Steal the profile for info_ptr. */ + if (info_ptr != NULL) + { + png_free_data(png_ptr, info_ptr, + PNG_FREE_ICCP, 0); - if (png_crc_finish(png_ptr, skip)) + info_ptr->iccp_name = png_voidcast(char*, + png_malloc_base(png_ptr, + keyword_length+1)); + if (info_ptr->iccp_name != NULL) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; + memcpy(info_ptr->iccp_name, keyword, + keyword_length+1); + info_ptr->iccp_proflen = + profile_length; + info_ptr->iccp_profile = profile; + png_ptr->read_buffer = NULL; /*steal*/ + info_ptr->free_me |= PNG_FREE_ICCP; + info_ptr->valid |= PNG_INFO_iCCP; } - png_ptr->chunkdata[slength] = 0x00; + else + { + png_ptr->colorspace.flags |= + PNG_COLORSPACE_INVALID; + errmsg = "out of memory"; + } + } - for (profile = png_ptr->chunkdata; *profile; profile++) - /* Empty loop to find end of name */ ; + /* else the profile remains in the read + * buffer which gets reused for subsequent + * chunks. + */ - ++profile; + if (info_ptr != NULL) + png_colorspace_sync(png_ptr, info_ptr); - /* There should be at least one zero (the compression type byte) - * following the separator, and we should be on it - */ - if (profile >= png_ptr->chunkdata + slength - 1) + if (errmsg == NULL) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_warning(png_ptr, "Malformed iCCP chunk"); + png_ptr->zowner = 0; return; } + } - /* Compression_type should always be zero */ - compression_type = *profile++; + else if (size > 0) + errmsg = "truncated"; - if (compression_type) - { - png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk"); - compression_type = 0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8 - wrote nonzero) */ + else + errmsg = png_ptr->zstream.msg; } - prefix_length = profile - png_ptr->chunkdata; - png_decompress_chunk(png_ptr, compression_type, - slength, prefix_length, &data_length); + /* else png_icc_check_tag_table output an error */ + } - profile_length = data_length - prefix_length; + else /* profile truncated */ + errmsg = png_ptr->zstream.msg; + } - if (prefix_length > data_length || profile_length < 4) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_warning(png_ptr, "Profile size field missing from iCCP chunk"); - return; + else + errmsg = "out of memory"; } - /* Check the profile_size recorded in the first 32 bits of the ICC profile */ - pC = (png_bytep)(png_ptr->chunkdata + prefix_length); - profile_size = ((*(pC )) << 24) | - ((*(pC + 1)) << 16) | - ((*(pC + 2)) << 8) | - ((*(pC + 3)) ); + /* else png_icc_check_header output an error */ + } - /* NOTE: the following guarantees that 'profile_length' fits into 32 bits, - * because profile_size is a 32 bit value. - */ - if (profile_size < profile_length) - profile_length = profile_size; + /* else png_icc_check_length output an error */ + } - /* And the following guarantees that profile_size == profile_length. */ - if (profile_size > profile_length) - { - PNG_WARNING_PARAMETERS(p) + else /* profile truncated */ + errmsg = png_ptr->zstream.msg; - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + /* Release the stream */ + png_ptr->zowner = 0; + } - png_warning_parameter_unsigned(p, 1, PNG_NUMBER_FORMAT_u, profile_size); - png_warning_parameter_unsigned(p, 2, PNG_NUMBER_FORMAT_u, profile_length); - png_formatted_warning(png_ptr, p, - "Ignoring iCCP chunk with declared size = @1 and actual length = @2"); - return; + else /* png_inflate_claim failed */ + errmsg = png_ptr->zstream.msg; } - png_set_iCCP(png_ptr, info_ptr, png_ptr->chunkdata, - compression_type, (png_bytep)png_ptr->chunkdata + prefix_length, - profile_size); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + else + errmsg = "bad compression method"; /* or missing */ + } + + else + errmsg = "bad keyword"; + } + + else + errmsg = "too many profiles"; + + /* Failure: the reason is in 'errmsg' */ + if (!finished) + png_crc_finish(png_ptr, length); + + png_ptr->colorspace.flags |= PNG_COLORSPACE_INVALID; + png_colorspace_sync(png_ptr, info_ptr); + if (errmsg != NULL) /* else already output */ + png_chunk_benign_error(png_ptr, errmsg); } #endif /* PNG_READ_iCCP_SUPPORTED */ #ifdef PNG_READ_sPLT_SUPPORTED void /* PRIVATE */ -png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_sPLT(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) /* Note: this does not properly handle chunks that are > 64K under DOS */ { - png_bytep entry_start; + png_bytep entry_start, buffer; png_sPLT_t new_palette; png_sPLT_entryp pp; png_uint_32 data_length; int entry_size, i; png_uint_32 skip = 0; - png_size_t slength; png_uint_32 dl; png_size_t max_dl; png_debug(1, "in png_handle_sPLT"); @@ -1402,80 +1589,74 @@ } #endif if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before sPLT"); + png_chunk_error(png_ptr, "missing IHDR"); else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid sPLT after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } #ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) + if (length > 65535U) { - png_warning(png_ptr, "sPLT chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "too large to fit in memory"); + return; } #endif - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc(png_ptr, length + 1); + buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); + if (buffer == NULL) + { + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of memory"); + return; + } + /* WARNING: this may break if size_t is less than 32 bits; it is assumed * that the PNG_MAX_MALLOC_64K test is enabled in this case, but this is a * potential breakage point if the types in pngconf.h aren't exactly right. */ - slength = length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + png_crc_read(png_ptr, buffer, length); if (png_crc_finish(png_ptr, skip)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - png_ptr->chunkdata[slength] = 0x00; + buffer[length] = 0; - for (entry_start = (png_bytep)png_ptr->chunkdata; *entry_start; - entry_start++) + for (entry_start = buffer; *entry_start; entry_start++) /* Empty loop to find end of name */ ; ++entry_start; /* A sample depth should follow the separator, and we should be on it */ - if (entry_start > (png_bytep)png_ptr->chunkdata + slength - 2) + if (entry_start > buffer + length - 2) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_warning(png_ptr, "malformed sPLT chunk"); return; } new_palette.depth = *entry_start++; entry_size = (new_palette.depth == 8 ? 6 : 10); /* This must fit in a png_uint_32 because it is derived from the original - * chunk data length (and use 'length', not 'slength' here for clarity - - * they are guaranteed to be the same, see the tests above.) + * chunk data length. */ - data_length = length - (png_uint_32)(entry_start - - (png_bytep)png_ptr->chunkdata); + data_length = length - (png_uint_32)(entry_start - buffer); /* Integrity-check the data length */ if (data_length % entry_size) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_warning(png_ptr, "sPLT chunk has bad length"); return; } dl = (png_int_32)(data_length / entry_size); - max_dl = PNG_SIZE_MAX / png_sizeof(png_sPLT_entry); + max_dl = PNG_SIZE_MAX / (sizeof (png_sPLT_entry)); if (dl > max_dl) { png_warning(png_ptr, "sPLT chunk too long"); @@ -1484,9 +1665,9 @@ new_palette.nentries = (png_int_32)(data_length / entry_size); new_palette.entries = (png_sPLT_entryp)png_malloc_warn( - png_ptr, new_palette.nentries * png_sizeof(png_sPLT_entry)); + png_ptr, new_palette.nentries * (sizeof (png_sPLT_entry))); if (new_palette.entries == NULL) { png_warning(png_ptr, "sPLT chunk requires too much memory"); @@ -1542,40 +1723,38 @@ } #endif /* Discard all chunk data except the name and stash that */ - new_palette.name = png_ptr->chunkdata; + new_palette.name = (png_charp)buffer; png_set_sPLT(png_ptr, info_ptr, &new_palette, 1); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_free(png_ptr, new_palette.entries); } #endif /* PNG_READ_sPLT_SUPPORTED */ #ifdef PNG_READ_tRNS_SUPPORTED void /* PRIVATE */ -png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_tRNS(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte readbuf[PNG_MAX_PALETTE_LENGTH]; png_debug(1, "in png_handle_tRNS"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before tRNS"); + png_chunk_error(png_ptr, "missing IHDR"); else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid tRNS after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS)) { - png_warning(png_ptr, "Duplicate tRNS chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY) @@ -1583,10 +1762,10 @@ png_byte buf[2]; if (length != 2) { - png_warning(png_ptr, "Incorrect tRNS chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 2); @@ -1599,14 +1778,14 @@ png_byte buf[6]; if (length != 6) { - png_warning(png_ptr, "Incorrect tRNS chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } - png_crc_read(png_ptr, buf, (png_size_t)length); + png_crc_read(png_ptr, buf, length); png_ptr->num_trans = 1; png_ptr->trans_color.red = png_get_uint_16(buf); png_ptr->trans_color.green = png_get_uint_16(buf + 2); png_ptr->trans_color.blue = png_get_uint_16(buf + 4); @@ -1615,35 +1794,30 @@ else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) { if (!(png_ptr->mode & PNG_HAVE_PLTE)) { - /* Should be an error, but we can cope with it. */ - png_warning(png_ptr, "Missing PLTE before tRNS"); - } - - if (length > (png_uint_32)png_ptr->num_palette || - length > PNG_MAX_PALETTE_LENGTH) - { - png_warning(png_ptr, "Incorrect tRNS chunk length"); + /* TODO: is this actually an error in the ISO spec? */ png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } - if (length == 0) + if (length > png_ptr->num_palette || length > PNG_MAX_PALETTE_LENGTH || + length == 0) { - png_warning(png_ptr, "Zero length tRNS chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } - png_crc_read(png_ptr, readbuf, (png_size_t)length); + png_crc_read(png_ptr, readbuf, length); png_ptr->num_trans = (png_uint_16)length; } else { - png_warning(png_ptr, "tRNS chunk not allowed with alpha channel"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid with alpha channel"); return; } if (png_crc_finish(png_ptr, 0)) @@ -1651,45 +1825,43 @@ png_ptr->num_trans = 0; return; } + /* TODO: this is a horrible side effect in the palette case because the + * png_struct ends up with a pointer to the tRNS buffer owned by the + * png_info. Fix this. + */ png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans, &(png_ptr->trans_color)); } #endif #ifdef PNG_READ_bKGD_SUPPORTED void /* PRIVATE */ -png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_bKGD(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_size_t truelen; + unsigned int truelen; png_byte buf[6]; png_color_16 background; png_debug(1, "in png_handle_bKGD"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before bKGD"); - - else if (png_ptr->mode & PNG_HAVE_IDAT) - { - png_warning(png_ptr, "Invalid bKGD after IDAT"); - png_crc_finish(png_ptr, length); - return; - } + png_chunk_error(png_ptr, "missing IHDR"); - else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && - !(png_ptr->mode & PNG_HAVE_PLTE)) + else if ((png_ptr->mode & PNG_HAVE_IDAT) || + (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE && + !(png_ptr->mode & PNG_HAVE_PLTE))) { - png_warning(png_ptr, "Missing PLTE before bKGD"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)) { - png_warning(png_ptr, "Duplicate bKGD chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) @@ -1702,10 +1874,10 @@ truelen = 2; if (length != truelen) { - png_warning(png_ptr, "Incorrect bKGD chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, truelen); @@ -1725,9 +1897,9 @@ if (info_ptr && info_ptr->num_palette) { if (buf[0] >= info_ptr->num_palette) { - png_warning(png_ptr, "Incorrect bKGD chunk index value"); + png_chunk_benign_error(png_ptr, "invalid index"); return; } background.red = (png_uint_16)png_ptr->palette[buf[0]].red; @@ -1764,49 +1936,41 @@ #endif #ifdef PNG_READ_hIST_SUPPORTED void /* PRIVATE */ -png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_hIST(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { unsigned int num, i; png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH]; png_debug(1, "in png_handle_hIST"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before hIST"); + png_chunk_error(png_ptr, "missing IHDR"); - else if (png_ptr->mode & PNG_HAVE_IDAT) - { - png_warning(png_ptr, "Invalid hIST after IDAT"); - png_crc_finish(png_ptr, length); - return; - } - - else if (!(png_ptr->mode & PNG_HAVE_PLTE)) + else if ((png_ptr->mode & PNG_HAVE_IDAT) || !(png_ptr->mode & PNG_HAVE_PLTE)) { - png_warning(png_ptr, "Missing PLTE before hIST"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)) { - png_warning(png_ptr, "Duplicate hIST chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } - if (length > 2*PNG_MAX_PALETTE_LENGTH || - length != (unsigned int) (2*png_ptr->num_palette)) + num = length / 2 ; + + if (num != png_ptr->num_palette || num > PNG_MAX_PALETTE_LENGTH) { - png_warning(png_ptr, "Incorrect hIST chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } - num = length / 2 ; - for (i = 0; i < num; i++) { png_byte buf[2]; @@ -1822,37 +1986,37 @@ #endif #ifdef PNG_READ_pHYs_SUPPORTED void /* PRIVATE */ -png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_pHYs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[9]; png_uint_32 res_x, res_y; int unit_type; png_debug(1, "in png_handle_pHYs"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before pHYs"); + png_chunk_error(png_ptr, "missing IHDR"); else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid pHYs after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)) { - png_warning(png_ptr, "Duplicate pHYs chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (length != 9) { - png_warning(png_ptr, "Incorrect pHYs chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 9); @@ -1868,37 +2032,37 @@ #endif #ifdef PNG_READ_oFFs_SUPPORTED void /* PRIVATE */ -png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_oFFs(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[9]; png_int_32 offset_x, offset_y; int unit_type; png_debug(1, "in png_handle_oFFs"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before oFFs"); + png_chunk_error(png_ptr, "missing IHDR"); else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid oFFs after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)) { - png_warning(png_ptr, "Duplicate oFFs chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (length != 9) { - png_warning(png_ptr, "Incorrect oFFs chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 9); @@ -1915,73 +2079,66 @@ #ifdef PNG_READ_pCAL_SUPPORTED /* Read the pCAL chunk (described in the PNG Extensions document) */ void /* PRIVATE */ -png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_pCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_int_32 X0, X1; png_byte type, nparams; - png_charp buf, units, endptr; + png_bytep buffer, buf, units, endptr; png_charpp params; - png_size_t slength; int i; png_debug(1, "in png_handle_pCAL"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before pCAL"); + png_chunk_error(png_ptr, "missing IHDR"); else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid pCAL after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)) { - png_warning(png_ptr, "Duplicate pCAL chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } png_debug1(2, "Allocating and reading pCAL chunk data (%u bytes)", length + 1); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); - if (png_ptr->chunkdata == NULL) + buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); + + if (buffer == NULL) { - png_warning(png_ptr, "No memory for pCAL purpose"); + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of memory"); return; } - slength = length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + png_crc_read(png_ptr, buffer, length); if (png_crc_finish(png_ptr, 0)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */ + buffer[length] = 0; /* Null terminate the last string */ png_debug(3, "Finding end of pCAL purpose string"); - for (buf = png_ptr->chunkdata; *buf; buf++) + for (buf = buffer; *buf; buf++) /* Empty loop */ ; - endptr = png_ptr->chunkdata + slength; + endptr = buffer + length; /* We need to have at least 12 bytes after the purpose string * in order to get the parameter information. */ if (endptr <= buf + 12) { - png_warning(png_ptr, "Invalid pCAL data"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + png_chunk_benign_error(png_ptr, "invalid"); return; } png_debug(3, "Reading pCAL X0, X1, type, nparams, and units"); @@ -1999,129 +2156,115 @@ (type == PNG_EQUATION_BASE_E && nparams != 3) || (type == PNG_EQUATION_ARBITRARY && nparams != 3) || (type == PNG_EQUATION_HYPERBOLIC && nparams != 4)) { - png_warning(png_ptr, "Invalid pCAL parameters for equation type"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + png_chunk_benign_error(png_ptr, "invalid parameter count"); return; } else if (type >= PNG_EQUATION_LAST) { - png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); + png_chunk_benign_error(png_ptr, "unrecognized equation type"); } for (buf = units; *buf; buf++) /* Empty loop to move past the units string. */ ; png_debug(3, "Allocating pCAL parameters array"); - params = (png_charpp)png_malloc_warn(png_ptr, - (png_size_t)(nparams * png_sizeof(png_charp))); + params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, + nparams * (sizeof (png_charp)))); if (params == NULL) { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_warning(png_ptr, "No memory for pCAL params"); + png_chunk_benign_error(png_ptr, "out of memory"); return; } /* Get pointers to the start of each parameter string. */ - for (i = 0; i < (int)nparams; i++) + for (i = 0; i < nparams; i++) { buf++; /* Skip the null string terminator from previous parameter. */ png_debug1(3, "Reading pCAL parameter %d", i); - for (params[i] = buf; buf <= endptr && *buf != 0x00; buf++) + for (params[i] = (png_charp)buf; buf <= endptr && *buf != 0; buf++) /* Empty loop to move past each parameter string */ ; /* Make sure we haven't run out of data yet */ if (buf > endptr) { - png_warning(png_ptr, "Invalid pCAL data"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_free(png_ptr, params); + png_chunk_benign_error(png_ptr, "invalid data"); return; } } - png_set_pCAL(png_ptr, info_ptr, png_ptr->chunkdata, X0, X1, type, nparams, - units, params); + png_set_pCAL(png_ptr, info_ptr, (png_charp)buffer, X0, X1, type, nparams, + (png_charp)units, params); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; png_free(png_ptr, params); } #endif #ifdef PNG_READ_sCAL_SUPPORTED /* Read the sCAL chunk */ void /* PRIVATE */ -png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_sCAL(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_size_t slength, i; + png_bytep buffer; + png_size_t i; int state; png_debug(1, "in png_handle_sCAL"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before sCAL"); + png_chunk_error(png_ptr, "missing IHDR"); else if (png_ptr->mode & PNG_HAVE_IDAT) { - png_warning(png_ptr, "Invalid sCAL after IDAT"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of place"); return; } else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL)) { - png_warning(png_ptr, "Duplicate sCAL chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } /* Need unit type, width, \0, height: minimum 4 bytes */ else if (length < 4) { - png_warning(png_ptr, "sCAL chunk too short"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_debug1(2, "Allocating and reading sCAL chunk data (%u bytes)", length + 1); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); + buffer = png_read_buffer(png_ptr, length+1, 2/*silent*/); - if (png_ptr->chunkdata == NULL) + if (buffer == NULL) { - png_warning(png_ptr, "Out of memory while processing sCAL chunk"); + png_chunk_benign_error(png_ptr, "out of memory"); png_crc_finish(png_ptr, length); return; } - slength = length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); - png_ptr->chunkdata[slength] = 0x00; /* Null terminate the last string */ + png_crc_read(png_ptr, buffer, length); + buffer[length] = 0; /* Null terminate the last string */ if (png_crc_finish(png_ptr, 0)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } /* Validate the unit. */ - if (png_ptr->chunkdata[0] != 1 && png_ptr->chunkdata[0] != 2) + if (buffer[0] != 1 && buffer[0] != 2) { - png_warning(png_ptr, "Invalid sCAL ignored: invalid unit"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + png_chunk_benign_error(png_ptr, "invalid unit"); return; } /* Validate the ASCII numbers, need two ASCII numbers separated by @@ -2129,66 +2272,61 @@ */ i = 1; state = 0; - if (!png_check_fp_number(png_ptr->chunkdata, slength, &state, &i) || - i >= slength || png_ptr->chunkdata[i++] != 0) - png_warning(png_ptr, "Invalid sCAL chunk ignored: bad width format"); + if (!png_check_fp_number((png_const_charp)buffer, length, &state, &i) || + i >= length || buffer[i++] != 0) + png_chunk_benign_error(png_ptr, "bad width format"); else if (!PNG_FP_IS_POSITIVE(state)) - png_warning(png_ptr, "Invalid sCAL chunk ignored: non-positive width"); + png_chunk_benign_error(png_ptr, "non-positive width"); else { png_size_t heighti = i; state = 0; - if (!png_check_fp_number(png_ptr->chunkdata, slength, &state, &i) || - i != slength) - png_warning(png_ptr, "Invalid sCAL chunk ignored: bad height format"); + if (!png_check_fp_number((png_const_charp)buffer, length, &state, &i) || + i != length) + png_chunk_benign_error(png_ptr, "bad height format"); else if (!PNG_FP_IS_POSITIVE(state)) - png_warning(png_ptr, - "Invalid sCAL chunk ignored: non-positive height"); + png_chunk_benign_error(png_ptr, "non-positive height"); else /* This is the (only) success case. */ - png_set_sCAL_s(png_ptr, info_ptr, png_ptr->chunkdata[0], - png_ptr->chunkdata+1, png_ptr->chunkdata+heighti); + png_set_sCAL_s(png_ptr, info_ptr, buffer[0], + (png_charp)buffer+1, (png_charp)buffer+heighti); } - - /* Clean up - just free the temporarily allocated buffer. */ - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; } #endif #ifdef PNG_READ_tIME_SUPPORTED void /* PRIVATE */ -png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_tIME(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { png_byte buf[7]; png_time mod_time; png_debug(1, "in png_handle_tIME"); if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Out of place tIME chunk"); + png_chunk_error(png_ptr, "missing IHDR"); else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)) { - png_warning(png_ptr, "Duplicate tIME chunk"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "duplicate"); return; } if (png_ptr->mode & PNG_HAVE_IDAT) png_ptr->mode |= PNG_AFTER_IDAT; if (length != 7) { - png_warning(png_ptr, "Incorrect tIME chunk length"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "invalid"); return; } png_crc_read(png_ptr, buf, 7); @@ -2209,16 +2347,15 @@ #ifdef PNG_READ_tEXt_SUPPORTED /* Note: this does not properly handle chunks that are > 64K under DOS */ void /* PRIVATE */ -png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_tEXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_textp text_ptr; + png_text text_info; + png_bytep buffer; png_charp key; png_charp text; png_uint_32 skip = 0; - png_size_t slength; - int ret; png_debug(1, "in png_handle_tEXt"); #ifdef PNG_USER_LIMITS_SUPPORTED @@ -2231,100 +2368,73 @@ } if (--png_ptr->user_chunk_cache_max == 1) { - png_warning(png_ptr, "No space in chunk cache for tEXt"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "no space in chunk cache"); return; } } #endif if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before tEXt"); + png_chunk_error(png_ptr, "missing IHDR"); if (png_ptr->mode & PNG_HAVE_IDAT) png_ptr->mode |= PNG_AFTER_IDAT; #ifdef PNG_MAX_MALLOC_64K - if (length > (png_uint_32)65535L) + if (length > 65535U) { - png_warning(png_ptr, "tEXt chunk too large to fit in memory"); - skip = length - (png_uint_32)65535L; - length = (png_uint_32)65535L; + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "too large to fit in memory"); + return; } #endif - png_free(png_ptr, png_ptr->chunkdata); - - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); + buffer = png_read_buffer(png_ptr, length+1, 1/*warn*/); - if (png_ptr->chunkdata == NULL) + if (buffer == NULL) { - png_warning(png_ptr, "No memory to process text chunk"); + png_chunk_benign_error(png_ptr, "out of memory"); return; } - slength = length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + png_crc_read(png_ptr, buffer, length); if (png_crc_finish(png_ptr, skip)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - key = png_ptr->chunkdata; - - key[slength] = 0x00; + key = (png_charp)buffer; + key[length] = 0; for (text = key; *text; text++) /* Empty loop to find end of key */ ; - if (text != key + slength) + if (text != key + length) text++; - text_ptr = (png_textp)png_malloc_warn(png_ptr, - png_sizeof(png_text)); - - if (text_ptr == NULL) - { - png_warning(png_ptr, "Not enough memory to process text chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } - - text_ptr->compression = PNG_TEXT_COMPRESSION_NONE; - text_ptr->key = key; - text_ptr->lang = NULL; - text_ptr->lang_key = NULL; - text_ptr->itxt_length = 0; - text_ptr->text = text; - text_ptr->text_length = png_strlen(text); - - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); - - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - png_free(png_ptr, text_ptr); + text_info.compression = PNG_TEXT_COMPRESSION_NONE; + text_info.key = key; + text_info.lang = NULL; + text_info.lang_key = NULL; + text_info.itxt_length = 0; + text_info.text = text; + text_info.text_length = strlen(text); - if (ret) + if (png_set_text_2(png_ptr, info_ptr, &text_info, 1)) png_warning(png_ptr, "Insufficient memory to process text chunk"); } #endif #ifdef PNG_READ_zTXt_SUPPORTED /* Note: this does not correctly handle chunks that are > 64K under DOS */ void /* PRIVATE */ -png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_zTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_textp text_ptr; - png_charp text; - int comp_type; - int ret; - png_size_t slength, prefix_len, data_len; + png_const_charp errmsg = NULL; + png_bytep buffer; + png_uint_32 keyword_length; png_debug(1, "in png_handle_zTXt"); #ifdef PNG_USER_LIMITS_SUPPORTED @@ -2337,125 +2447,103 @@ } if (--png_ptr->user_chunk_cache_max == 1) { - png_warning(png_ptr, "No space in chunk cache for zTXt"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "no space in chunk cache"); return; } } #endif if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before zTXt"); + png_chunk_error(png_ptr, "missing IHDR"); if (png_ptr->mode & PNG_HAVE_IDAT) png_ptr->mode |= PNG_AFTER_IDAT; -#ifdef PNG_MAX_MALLOC_64K - /* We will no doubt have problems with chunks even half this size, but - * there is no hard and fast rule to tell us where to stop. - */ - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "zTXt chunk too large to fit in memory"); - png_crc_finish(png_ptr, length); - return; - } -#endif + buffer = png_read_buffer(png_ptr, length, 2/*silent*/); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); - - if (png_ptr->chunkdata == NULL) + if (buffer == NULL) { - png_warning(png_ptr, "Out of memory processing zTXt chunk"); + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of memory"); return; } - slength = length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + png_crc_read(png_ptr, buffer, length); if (png_crc_finish(png_ptr, 0)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - png_ptr->chunkdata[slength] = 0x00; + /* TODO: also check that the keyword contents match the spec! */ + for (keyword_length = 0; + keyword_length < length && buffer[keyword_length] != 0; + ++keyword_length) + /* Empty loop to find end of name */ ; - for (text = png_ptr->chunkdata; *text; text++) - /* Empty loop */ ; + if (keyword_length > 79 || keyword_length < 1) + errmsg = "bad keyword"; - /* zTXt must have some text after the chunkdataword */ - if (text >= png_ptr->chunkdata + slength - 2) - { - png_warning(png_ptr, "Truncated zTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } + /* zTXt must have some LZ data after the keyword, although it may expand to + * zero bytes; we need a '\0' at the end of the keyword, the compression type + * then the LZ data: + */ + else if (keyword_length + 3 > length) + errmsg = "truncated"; + + else if (buffer[keyword_length+1] != PNG_COMPRESSION_TYPE_BASE) + errmsg = "unknown compression type"; else { - comp_type = *(++text); + png_alloc_size_t uncompressed_length = PNG_SIZE_MAX; - if (comp_type != PNG_TEXT_COMPRESSION_zTXt) + /* TODO: at present png_decompress_chunk imposes a single application + * level memory limit, this should be split to different values for iCCP + * and text chunks. + */ + if (png_decompress_chunk(png_ptr, length, keyword_length+2, + &uncompressed_length, 1/*terminate*/) == Z_STREAM_END) { - png_warning(png_ptr, "Unknown compression type in zTXt chunk"); - comp_type = PNG_TEXT_COMPRESSION_zTXt; - } + png_text text; - text++; /* Skip the compression_method byte */ - } - - prefix_len = text - png_ptr->chunkdata; - - png_decompress_chunk(png_ptr, comp_type, - (png_size_t)length, prefix_len, &data_len); + /* It worked; png_ptr->read_buffer now looks like a tEXt chunk except + * for the extra compression type byte and the fact that it isn't + * necessarily '\0' terminated. + */ + buffer = png_ptr->read_buffer; + buffer[uncompressed_length+(keyword_length+2)] = 0; - text_ptr = (png_textp)png_malloc_warn(png_ptr, - png_sizeof(png_text)); + text.compression = PNG_TEXT_COMPRESSION_zTXt; + text.key = (png_charp)buffer; + text.text = (png_charp)(buffer + keyword_length+2); + text.text_length = uncompressed_length; + text.itxt_length = 0; + text.lang = NULL; + text.lang_key = NULL; - if (text_ptr == NULL) - { - png_warning(png_ptr, "Not enough memory to process zTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; + if (png_set_text_2(png_ptr, info_ptr, &text, 1)) + errmsg = "insufficient memory"; } - text_ptr->compression = comp_type; - text_ptr->key = png_ptr->chunkdata; - text_ptr->lang = NULL; - text_ptr->lang_key = NULL; - text_ptr->itxt_length = 0; - text_ptr->text = png_ptr->chunkdata + prefix_len; - text_ptr->text_length = data_len; - - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); - - png_free(png_ptr, text_ptr); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; + else + errmsg = png_ptr->zstream.msg; + } - if (ret) - png_error(png_ptr, "Insufficient memory to store zTXt chunk"); + if (errmsg != NULL) + png_chunk_benign_error(png_ptr, errmsg); } #endif #ifdef PNG_READ_iTXt_SUPPORTED /* Note: this does not correctly handle chunks that are > 64K under DOS */ void /* PRIVATE */ -png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) +png_handle_iTXt(png_structrp png_ptr, png_inforp info_ptr, png_uint_32 length) { - png_textp text_ptr; - png_charp key, lang, text, lang_key; - int comp_flag; - int comp_type = 0; - int ret; - png_size_t slength, prefix_len, data_len; + png_const_charp errmsg = NULL; + png_bytep buffer; + png_uint_32 prefix_length; png_debug(1, "in png_handle_iTXt"); #ifdef PNG_USER_LIMITS_SUPPORTED @@ -2468,281 +2556,391 @@ } if (--png_ptr->user_chunk_cache_max == 1) { - png_warning(png_ptr, "No space in chunk cache for iTXt"); png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "no space in chunk cache"); return; } } #endif if (!(png_ptr->mode & PNG_HAVE_IHDR)) - png_error(png_ptr, "Missing IHDR before iTXt"); + png_chunk_error(png_ptr, "missing IHDR"); if (png_ptr->mode & PNG_HAVE_IDAT) png_ptr->mode |= PNG_AFTER_IDAT; -#ifdef PNG_MAX_MALLOC_64K - /* We will no doubt have problems with chunks even half this size, but - * there is no hard and fast rule to tell us where to stop. - */ - if (length > (png_uint_32)65535L) - { - png_warning(png_ptr, "iTXt chunk too large to fit in memory"); - png_crc_finish(png_ptr, length); - return; - } -#endif - - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1); + buffer = png_read_buffer(png_ptr, length+1, 1/*warn*/); - if (png_ptr->chunkdata == NULL) + if (buffer == NULL) { - png_warning(png_ptr, "No memory to process iTXt chunk"); + png_crc_finish(png_ptr, length); + png_chunk_benign_error(png_ptr, "out of memory"); return; } - slength = length; - png_crc_read(png_ptr, (png_bytep)png_ptr->chunkdata, slength); + png_crc_read(png_ptr, buffer, length); if (png_crc_finish(png_ptr, 0)) - { - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; return; - } - png_ptr->chunkdata[slength] = 0x00; - - for (lang = png_ptr->chunkdata; *lang; lang++) + /* First the keyword. */ + for (prefix_length=0; + prefix_length < length && buffer[prefix_length] != 0; + ++prefix_length) /* Empty loop */ ; - lang++; /* Skip NUL separator */ - - /* iTXt must have a language tag (possibly empty), two compression bytes, - * translated keyword (possibly empty), and possibly some text after the - * keyword - */ - - if (lang >= png_ptr->chunkdata + slength - 3) - { - png_warning(png_ptr, "Truncated iTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } + /* Perform a basic check on the keyword length here. */ + if (prefix_length > 79 || prefix_length < 1) + errmsg = "bad keyword"; + + /* Expect keyword, compression flag, compression type, language, translated + * keyword (both may be empty but are 0 terminated) then the text, which may + * be empty. + */ + else if (prefix_length + 5 > length) + errmsg = "truncated"; + + else if (buffer[prefix_length+1] == 0 || + (buffer[prefix_length+1] == 1 && + buffer[prefix_length+2] == PNG_COMPRESSION_TYPE_BASE)) + { + int compressed = buffer[prefix_length+1] != 0; + png_uint_32 language_offset, translated_keyword_offset; + png_alloc_size_t uncompressed_length = 0; + + /* Now the language tag */ + prefix_length += 3; + language_offset = prefix_length; - else - { - comp_flag = *lang++; - comp_type = *lang++; - } + for (; prefix_length < length && buffer[prefix_length] != 0; + ++prefix_length) + /* Empty loop */ ; - if (comp_type || (comp_flag && comp_flag != PNG_TEXT_COMPRESSION_zTXt)) - { - png_warning(png_ptr, "Unknown iTXt compression type or method"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } + /* WARNING: the length may be invalid here, this is checked below. */ + translated_keyword_offset = ++prefix_length; - for (lang_key = lang; *lang_key; lang_key++) + for (; prefix_length < length && buffer[prefix_length] != 0; + ++prefix_length) /* Empty loop */ ; - lang_key++; /* Skip NUL separator */ + /* prefix_length should now be at the trailing '\0' of the translated + * keyword, but it may already be over the end. None of this arithmetic + * can overflow because chunks are at most 2^31 bytes long, but on 16-bit + * systems the available allocaton may overflow. + */ + ++prefix_length; - if (lang_key >= png_ptr->chunkdata + slength) - { - png_warning(png_ptr, "Truncated iTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; - } + if (!compressed && prefix_length <= length) + uncompressed_length = length - prefix_length; - for (text = lang_key; *text; text++) - /* Empty loop */ ; + else if (compressed && prefix_length < length) + { + uncompressed_length = PNG_SIZE_MAX; - text++; /* Skip NUL separator */ + /* TODO: at present png_decompress_chunk imposes a single application + * level memory limit, this should be split to different values for + * iCCP and text chunks. + */ + if (png_decompress_chunk(png_ptr, length, prefix_length, + &uncompressed_length, 1/*terminate*/) == Z_STREAM_END) + buffer = png_ptr->read_buffer; - if (text >= png_ptr->chunkdata + slength) - { - png_warning(png_ptr, "Malformed iTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; + else + errmsg = png_ptr->zstream.msg; } - prefix_len = text - png_ptr->chunkdata; + else + errmsg = "truncated"; + + if (errmsg == NULL) + { + png_text text; - key=png_ptr->chunkdata; + buffer[uncompressed_length+prefix_length] = 0; - if (comp_flag) - png_decompress_chunk(png_ptr, comp_type, - (size_t)length, prefix_len, &data_len); + if (compressed) + text.compression = PNG_ITXT_COMPRESSION_NONE; else - data_len = png_strlen(png_ptr->chunkdata + prefix_len); + text.compression = PNG_ITXT_COMPRESSION_zTXt; - text_ptr = (png_textp)png_malloc_warn(png_ptr, - png_sizeof(png_text)); + text.key = (png_charp)buffer; + text.lang = (png_charp)buffer + language_offset; + text.lang_key = (png_charp)buffer + translated_keyword_offset; + text.text = (png_charp)buffer + prefix_length; + text.text_length = 0; + text.itxt_length = uncompressed_length; - if (text_ptr == NULL) - { - png_warning(png_ptr, "Not enough memory to process iTXt chunk"); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; - return; + if (png_set_text_2(png_ptr, info_ptr, &text, 1)) + errmsg = "insufficient memory"; + } } - text_ptr->compression = (int)comp_flag + 1; - text_ptr->lang_key = png_ptr->chunkdata + (lang_key - key); - text_ptr->lang = png_ptr->chunkdata + (lang - key); - text_ptr->itxt_length = data_len; - text_ptr->text_length = 0; - text_ptr->key = png_ptr->chunkdata; - text_ptr->text = png_ptr->chunkdata + prefix_len; + else + errmsg = "bad compression info"; - ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1); + if (errmsg != NULL) + png_chunk_benign_error(png_ptr, errmsg); +} +#endif - png_free(png_ptr, text_ptr); - png_free(png_ptr, png_ptr->chunkdata); - png_ptr->chunkdata = NULL; +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED +/* Utility function for png_handle_unknown; set up png_ptr::unknown_chunk */ +static int +png_cache_unknown_chunk(png_structrp png_ptr, png_uint_32 length) +{ + png_alloc_size_t limit = PNG_SIZE_MAX; - if (ret) - png_error(png_ptr, "Insufficient memory to store iTXt chunk"); + if (png_ptr->unknown_chunk.data != NULL) + { + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; } + +# ifdef PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED + if (png_ptr->user_chunk_malloc_max > 0 && + png_ptr->user_chunk_malloc_max < limit) + limit = png_ptr->user_chunk_malloc_max; + +# elif PNG_USER_CHUNK_MALLOC_MAX > 0 + if (PNG_USER_CHUNK_MALLOC_MAX < limit) + limit = PNG_USER_CHUNK_MALLOC_MAX; #endif -/* This function is called when we haven't found a handler for a - * chunk. If there isn't a problem with the chunk itself (ie bad - * chunk name, CRC, or a critical chunk), the chunk is silently ignored - * -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which - * case it will be saved away to be written out later. - */ -void /* PRIVATE */ -png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length) + if (length <= limit) { - png_uint_32 skip = 0; + PNG_CSTRING_FROM_CHUNK(png_ptr->unknown_chunk.name, png_ptr->chunk_name); + /* The following is safe because of the PNG_SIZE_MAX init above */ + png_ptr->unknown_chunk.size = (png_size_t)length/*SAFE*/; + /* 'mode' is a flag array, only the bottom four bits matter here */ + png_ptr->unknown_chunk.location = (png_byte)png_ptr->mode/*SAFE*/; - png_debug(1, "in png_handle_unknown"); + if (length == 0) + png_ptr->unknown_chunk.data = NULL; -#ifdef PNG_USER_LIMITS_SUPPORTED - if (png_ptr->user_chunk_cache_max != 0) - { - if (png_ptr->user_chunk_cache_max == 1) + else { - png_crc_finish(png_ptr, length); - return; + /* Do a 'warn' here - it is handled below. */ + png_ptr->unknown_chunk.data = png_voidcast(png_bytep, + png_malloc_warn(png_ptr, length)); + } } - if (--png_ptr->user_chunk_cache_max == 1) + if (png_ptr->unknown_chunk.data == NULL && length > 0) { - png_warning(png_ptr, "No space in chunk cache for unknown chunk"); + /* This is benign because we clean up correctly */ png_crc_finish(png_ptr, length); - return; - } + png_chunk_benign_error(png_ptr, "unknown chunk exceeds memory limits"); + return 0; } -#endif - if (png_ptr->mode & PNG_HAVE_IDAT) + else { - if (png_ptr->chunk_name != png_IDAT) - png_ptr->mode |= PNG_AFTER_IDAT; + if (length > 0) + png_crc_read(png_ptr, png_ptr->unknown_chunk.data, length); + png_crc_finish(png_ptr, 0); + return 1; + } } +#endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ - if (PNG_CHUNK_CRITICAL(png_ptr->chunk_name)) +/* Handle an unknown, or known but disabled, chunk */ +void /* PRIVATE */ +png_handle_unknown(png_structrp png_ptr, png_inforp info_ptr, + png_uint_32 length, int keep) { -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - if (png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name) != - PNG_HANDLE_CHUNK_ALWAYS -#ifdef PNG_READ_USER_CHUNKS_SUPPORTED - && png_ptr->read_user_chunk_fn == NULL -#endif - ) -#endif - png_chunk_error(png_ptr, "unknown critical chunk"); - } + int handled = 0; /* the chunk was handled */ + + png_debug(1, "in png_handle_unknown"); #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED - if ((png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS) -#ifdef PNG_READ_USER_CHUNKS_SUPPORTED - || (png_ptr->read_user_chunk_fn != NULL) + /* NOTE: this code is based on the code in libpng-1.4.12 except for fixing + * the bug which meant that setting a non-default behavior for a specific + * chunk would be ignored (the default was always used unless a user + * callback was installed). + * + * 'keep' is the value from the png_chunk_unknown_handling, the setting for + * this specific chunk_name, if PNG_HANDLE_AS_UNKNOWN_SUPPORTED, if not it + * will always be PNG_HANDLE_CHUNK_AS_DEFAULT and it needs to be set here. + * This is just an optimization to avoid multiple calls to the lookup + * function. + */ +# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + keep = png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name); #endif - ) - { -#ifdef PNG_MAX_MALLOC_64K - if (length > 65535) - { - png_warning(png_ptr, "unknown chunk too large to fit in memory"); - skip = length - 65535; - length = 65535; - } #endif - /* TODO: this code is very close to the unknown handling in pngpread.c, - * maybe it can be put into a common utility routine? - * png_struct::unknown_chunk is just used as a temporary variable, along - * with the data into which the chunk is read. These can be eliminated. + /* One of the following methods will read the chunk or skip it (at least one + * of these is always defined because this is the only way to switch on + * PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) */ - PNG_CSTRING_FROM_CHUNK(png_ptr->unknown_chunk.name, png_ptr->chunk_name); - png_ptr->unknown_chunk.size = (png_size_t)length; - - if (length == 0) - png_ptr->unknown_chunk.data = NULL; - - else - { - png_ptr->unknown_chunk.data = (png_bytep)png_malloc(png_ptr, length); - png_crc_read(png_ptr, png_ptr->unknown_chunk.data, length); - } - #ifdef PNG_READ_USER_CHUNKS_SUPPORTED + /* The user callback takes precedence over the chunk keep value, but the + * keep value is still required to validate a save of a critical chunk. + */ if (png_ptr->read_user_chunk_fn != NULL) { + if (png_cache_unknown_chunk(png_ptr, length)) + { /* Callback to user unknown chunk handler */ - int ret; - - ret = (*(png_ptr->read_user_chunk_fn)) - (png_ptr, &png_ptr->unknown_chunk); + int ret = (*(png_ptr->read_user_chunk_fn))(png_ptr, + &png_ptr->unknown_chunk); + /* ret is: + * negative: An error occured, png_chunk_error will be called. + * zero: The chunk was not handled, the chunk will be discarded + * unless png_set_keep_unknown_chunks has been used to set + * a 'keep' behavior for this particular chunk, in which + * case that will be used. A critical chunk will cause an + * error at this point unless it is to be saved. + * positive: The chunk was handled, libpng will ignore/discard it. + */ if (ret < 0) png_chunk_error(png_ptr, "error in user chunk"); - if (ret == 0) + else if (ret == 0) { - if (PNG_CHUNK_CRITICAL(png_ptr->chunk_name)) + /* If the keep value is 'default' or 'never' override it, but + * still error out on critical chunks unless the keep value is + * 'always' While this is weird it is the behavior in 1.4.12. A + * possible improvement would be to obey the value set for the + * chunk, but this would be an API change that would probably + * damage some applications. + * + * The png_app_warning below catches the case that matters, where + * the application has neither set specific save for this chunk + * or global save. + */ + if (keep < PNG_HANDLE_CHUNK_IF_SAFE) { -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - if (png_chunk_unknown_handling(png_ptr, png_ptr->chunk_name) != - PNG_HANDLE_CHUNK_ALWAYS) +# ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + if (png_ptr->unknown_default < PNG_HANDLE_CHUNK_IF_SAFE) + png_app_warning(png_ptr, + "forcing save of an unhandled chunk; please call png_set_keep_unknown_chunks"); #endif - png_chunk_error(png_ptr, "unknown critical chunk"); + keep = PNG_HANDLE_CHUNK_IF_SAFE; + } } - png_set_unknown_chunks(png_ptr, info_ptr, - &png_ptr->unknown_chunk, 1); + else /* chunk was handled */ + { + handled = 1; + /* Critical chunks can be safely discarded at this point. */ + keep = PNG_HANDLE_CHUNK_NEVER; } } else -#endif - png_set_unknown_chunks(png_ptr, info_ptr, &png_ptr->unknown_chunk, 1); + keep = PNG_HANDLE_CHUNK_NEVER; /* insufficient memory */ + } - png_free(png_ptr, png_ptr->unknown_chunk.data); - png_ptr->unknown_chunk.data = NULL; + else + /* Use the SAVE_UNKNOWN_CHUNKS code or skip the chunk */ +# endif /* PNG_READ_USER_CHUNKS_SUPPORTED */ + +# ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED + { + /* keep is currently just the per-chunk setting, if there was no + * setting change it to the global default now (not that this may + * still be AS_DEFAULT) then obtain the cache of the chunk if required, + * if not simply skip the chunk. + */ + if (keep == PNG_HANDLE_CHUNK_AS_DEFAULT) + keep = png_ptr->unknown_default; + + if (keep == PNG_HANDLE_CHUNK_ALWAYS || + (keep == PNG_HANDLE_CHUNK_IF_SAFE && + PNG_CHUNK_ANCILLIARY(png_ptr->chunk_name))) + { + if (!png_cache_unknown_chunk(png_ptr, length)) + keep = PNG_HANDLE_CHUNK_NEVER; } else + png_crc_finish(png_ptr, length); + } +# else +# ifndef PNG_READ_USER_CHUNKS_SUPPORTED +# error no method to support READ_UNKNOWN_CHUNKS #endif - skip = length; - png_crc_finish(png_ptr, skip); + { + /* If here there is no read callback pointer set and no support is + * compiled in to just save the unknown chunks, so simply skip this + * chunk. If 'keep' is something other than AS_DEFAULT or NEVER then + * the app has erroneously asked for unknown chunk saving when there + * is no support. + */ + if (keep > PNG_HANDLE_CHUNK_NEVER) + png_app_error(png_ptr, "no unknown chunk support available"); -#ifndef PNG_READ_USER_CHUNKS_SUPPORTED - PNG_UNUSED(info_ptr) /* Quiet compiler warnings about unused info_ptr */ + png_crc_finish(png_ptr, length); + } #endif + +# ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED + /* Now store the chunk in the chunk list if appropriate, and if the limits + * permit it. + */ + if (keep == PNG_HANDLE_CHUNK_ALWAYS || + (keep == PNG_HANDLE_CHUNK_IF_SAFE && + PNG_CHUNK_ANCILLIARY(png_ptr->chunk_name))) + { +# ifdef PNG_USER_LIMITS_SUPPORTED + switch (png_ptr->user_chunk_cache_max) + { + case 2: + png_ptr->user_chunk_cache_max = 1; + png_chunk_benign_error(png_ptr, "no space in chunk cache"); + /* FALL THROUGH */ + case 1: + /* NOTE: prior to 1.6.0 this case resulted in an unknown critical + * chunk being skipped, now there will be a hard error below. + */ + break; + + default: /* not at limit */ + --(png_ptr->user_chunk_cache_max); + /* FALL THROUGH */ + case 0: /* no limit */ +# endif /* PNG_USER_LIMITS_SUPPORTED */ + /* Here when the limit isn't reached or when limits are compiled + * out; store the chunk. + */ + png_set_unknown_chunks(png_ptr, info_ptr, + &png_ptr->unknown_chunk, 1); + handled = 1; +# ifdef PNG_USER_LIMITS_SUPPORTED + break; + } +# endif + } +# else /* no store support! */ + PNG_UNUSED(info_ptr) +# error untested code (reading unknown chunks with no store support) +# endif + + /* Regardless of the error handling below the cached data (if any) can be + * freed now. Notice that the data is not freed if there is a png_error, but + * it will be freed by destroy_read_struct. + */ + if (png_ptr->unknown_chunk.data != NULL) + png_free(png_ptr, png_ptr->unknown_chunk.data); + png_ptr->unknown_chunk.data = NULL; + +#else /* !PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ + /* There is no support to read an unknown chunk, so just skip it. */ + png_crc_finish(png_ptr, length); + PNG_UNUSED(info_ptr) + PNG_UNUSED(keep) +#endif /* !PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ + + /* Check for unhandled critical chunks */ + if (!handled && PNG_CHUNK_CRITICAL(png_ptr->chunk_name)) + png_chunk_error(png_ptr, "unhandled critical chunk"); } /* This function is called to verify that a chunk name is valid. * This function can't have the "critical chunk check" incorporated @@ -2756,9 +2954,9 @@ * ((c) < 65 || (c) > 122 || ((c) > 90 && (c) < 97)) */ void /* PRIVATE */ -png_check_chunk_name(png_structp png_ptr, png_uint_32 chunk_name) +png_check_chunk_name(png_structrp png_ptr, png_uint_32 chunk_name) { int i; png_debug(1, "in png_check_chunk_name"); @@ -2781,9 +2979,9 @@ * (dp) is filled from the start by replicating the available pixels. If * 'display' is false only those pixels present in the pass are filled in. */ void /* PRIVATE */ -png_combine_row(png_structp png_ptr, png_bytep dp, int display) +png_combine_row(png_const_structrp png_ptr, png_bytep dp, int display) { unsigned int pixel_depth = png_ptr->transformed_pixel_depth; png_const_bytep sp = png_ptr->row_buf + 1; png_uint_32 row_width = png_ptr->width; @@ -2831,9 +3029,9 @@ end_mask = 0xff >> end_mask; /* end_mask is now the bits to *keep* from the destination row */ } - /* For non-interlaced images this reduces to a png_memcpy(). A png_memcpy() + /* For non-interlaced images this reduces to a memcpy(). A memcpy() * will also happen if interlacing isn't supported or if the application * does not call png_set_interlace_handling(). In the latter cases the * caller just gets a sequence of the unexpanded rows from each interlace * pass. @@ -3132,36 +3330,37 @@ #if PNG_ALIGN_TYPE != PNG_ALIGN_NONE /* Check for double byte alignment and, if possible, use a * 16-bit copy. Don't attempt this for narrow images - ones that * are less than an interlace panel wide. Don't attempt it for - * wide bytes_to_copy either - use the png_memcpy there. + * wide bytes_to_copy either - use the memcpy there. */ - if (bytes_to_copy < 16 /*else use png_memcpy*/ && + if (bytes_to_copy < 16 /*else use memcpy*/ && png_isaligned(dp, png_uint_16) && png_isaligned(sp, png_uint_16) && - bytes_to_copy % sizeof (png_uint_16) == 0 && - bytes_to_jump % sizeof (png_uint_16) == 0) + bytes_to_copy % (sizeof (png_uint_16)) == 0 && + bytes_to_jump % (sizeof (png_uint_16)) == 0) { /* Everything is aligned for png_uint_16 copies, but try for * png_uint_32 first. */ if (png_isaligned(dp, png_uint_32) && png_isaligned(sp, png_uint_32) && - bytes_to_copy % sizeof (png_uint_32) == 0 && - bytes_to_jump % sizeof (png_uint_32) == 0) + bytes_to_copy % (sizeof (png_uint_32)) == 0 && + bytes_to_jump % (sizeof (png_uint_32)) == 0) { - png_uint_32p dp32 = (png_uint_32p)dp; - png_const_uint_32p sp32 = (png_const_uint_32p)sp; + png_uint_32p dp32 = png_aligncast(png_uint_32p,dp); + png_const_uint_32p sp32 = png_aligncastconst( + png_const_uint_32p, sp); unsigned int skip = (bytes_to_jump-bytes_to_copy) / - sizeof (png_uint_32); + (sizeof (png_uint_32)); do { size_t c = bytes_to_copy; do { *dp32++ = *sp32++; - c -= sizeof (png_uint_32); + c -= (sizeof (png_uint_32)); } while (c > 0); if (row_width <= bytes_to_jump) @@ -3189,20 +3388,21 @@ * not too large. */ else { - png_uint_16p dp16 = (png_uint_16p)dp; - png_const_uint_16p sp16 = (png_const_uint_16p)sp; + png_uint_16p dp16 = png_aligncast(png_uint_16p, dp); + png_const_uint_16p sp16 = png_aligncastconst( + png_const_uint_16p, sp); unsigned int skip = (bytes_to_jump-bytes_to_copy) / - sizeof (png_uint_16); + (sizeof (png_uint_16)); do { size_t c = bytes_to_copy; do { *dp16++ = *sp16++; - c -= sizeof (png_uint_16); + c -= (sizeof (png_uint_16)); } while (c > 0); if (row_width <= bytes_to_jump) @@ -3224,12 +3424,12 @@ } } #endif /* PNG_ALIGN_ code */ - /* The true default - use a png_memcpy: */ + /* The true default - use a memcpy: */ for (;;) { - png_memcpy(dp, sp, bytes_to_copy); + memcpy(dp, sp, bytes_to_copy); if (row_width <= bytes_to_jump) return; @@ -3248,13 +3448,13 @@ } else #endif - /* If here then the switch above wasn't used so just png_memcpy the whole row + /* If here then the switch above wasn't used so just memcpy the whole row * from the temporary row buffer (notice that this overwrites the end of the * destination row if it is a partial byte.) */ - png_memcpy(dp, sp, PNG_ROWBYTES(pixel_depth, row_width)); + memcpy(dp, sp, PNG_ROWBYTES(pixel_depth, row_width)); /* Restore the overwritten bits from the last byte if necessary. */ if (end_ptr != NULL) *end_ptr = (png_byte)((end_byte & end_mask) | (*end_ptr & ~end_mask)); @@ -3313,10 +3513,11 @@ { v = (png_byte)((*sp >> sshift) & 0x01); for (j = 0; j < jstop; j++) { - *dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff); - *dp |= (png_byte)(v << dshift); + unsigned int tmp = *dp & (0x7f7f >> (7 - dshift)); + tmp |= v << dshift; + *dp = (png_byte)(tmp & 0xff); if (dshift == s_end) { dshift = s_start; @@ -3375,10 +3576,11 @@ v = (png_byte)((*sp >> sshift) & 0x03); for (j = 0; j < jstop; j++) { - *dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff); - *dp |= (png_byte)(v << dshift); + unsigned int tmp = *dp & (0x3f3f >> (6 - dshift)); + tmp |= v << dshift; + *dp = (png_byte)(tmp & 0xff); if (dshift == s_end) { dshift = s_start; @@ -3436,10 +3638,11 @@ int j; for (j = 0; j < jstop; j++) { - *dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff); - *dp |= (png_byte)(v << dshift); + unsigned int tmp = *dp & (0xf0f >> (4 - dshift)); + tmp |= v << dshift; + *dp = (png_byte)(tmp & 0xff); if (dshift == s_end) { dshift = s_start; @@ -3478,13 +3681,13 @@ { png_byte v[8]; int j; - png_memcpy(v, sp, pixel_bytes); + memcpy(v, sp, pixel_bytes); for (j = 0; j < jstop; j++) { - png_memcpy(dp, v, pixel_bytes); + memcpy(dp, v, pixel_bytes); dp -= pixel_bytes; } sp -= pixel_bytes; @@ -3675,9 +3878,9 @@ if (!f) return 0; - while (fread(&aux, sizeof(aux), 1, f) > 0) + while (fread(&aux, (sizeof aux), 1, f) > 0) { if (aux.a_type == AT_HWCAP && aux.a_un.a_val & cap) { @@ -3692,9 +3895,9 @@ } #endif /* __linux__ */ static void -png_init_filter_functions_neon(png_structp pp, unsigned int bpp) +png_init_filter_functions_neon(png_structrp pp, unsigned int bpp) { #ifdef __linux__ if (!png_have_hwcap(HWCAP_NEON)) return; @@ -3720,9 +3923,9 @@ } #endif /* PNG_ARM_NEON */ static void -png_init_filter_functions(png_structp pp) +png_init_filter_functions(png_structrp pp) { unsigned int bpp = (pp->pixel_depth + 7) >> 3; pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub; @@ -3740,9 +3943,9 @@ #endif } void /* PRIVATE */ -png_read_filter_row(png_structp pp, png_row_infop row_info, png_bytep row, +png_read_filter_row(png_structrp pp, png_row_infop row_info, png_bytep row, png_const_bytep prev_row, int filter) { if (pp->read_filter[0] == NULL) png_init_filter_functions(pp); @@ -3751,9 +3954,183 @@ } #ifdef PNG_SEQUENTIAL_READ_SUPPORTED void /* PRIVATE */ -png_read_finish_row(png_structp png_ptr) +png_read_IDAT_data(png_structrp png_ptr, png_bytep output, + png_alloc_size_t avail_out) +{ + /* Loop reading IDATs and decompressing the result into output[avail_out] */ + png_ptr->zstream.next_out = output; + png_ptr->zstream.avail_out = 0; /* safety: set below */ + + if (output == NULL) + avail_out = 0; + + do + { + int ret; + png_byte tmpbuf[PNG_INFLATE_BUF_SIZE]; + + if (png_ptr->zstream.avail_in == 0) + { + uInt avail_in; + png_bytep buffer; + + while (png_ptr->idat_size == 0) + { + png_crc_finish(png_ptr, 0); + + png_ptr->idat_size = png_read_chunk_header(png_ptr); + /* This is an error even in the 'check' case because the code just + * consumed a non-IDAT header. + */ + if (png_ptr->chunk_name != png_IDAT) + png_error(png_ptr, "Not enough image data"); + } + + avail_in = png_ptr->IDAT_read_size; + + if (avail_in > png_ptr->idat_size) + avail_in = (uInt)png_ptr->idat_size; + + /* A PNG with a gradually increasing IDAT size will defeat this attempt + * to minimize memory usage by causing lots of re-allocs, but + * realistically doing IDAT_read_size re-allocs is not likely to be a + * big problem. + */ + buffer = png_read_buffer(png_ptr, avail_in, 0/*error*/); + + png_crc_read(png_ptr, buffer, avail_in); + png_ptr->idat_size -= avail_in; + + png_ptr->zstream.next_in = buffer; + png_ptr->zstream.avail_in = avail_in; + } + + /* And set up the output side. */ + if (output != NULL) /* standard read */ + { + uInt out = ZLIB_IO_MAX; + + if (out > avail_out) + out = (uInt)avail_out; + + avail_out -= out; + png_ptr->zstream.avail_out = out; + } + + else /* check for end */ + { + png_ptr->zstream.next_out = tmpbuf; + png_ptr->zstream.avail_out = (sizeof tmpbuf); + } + + /* Use NO_FLUSH; this gives zlib the maximum opportunity to optimize the + * process. If the LZ stream is truncated the sequential reader will + * terminally damage the stream, above, by reading the chunk header of the + * following chunk (it then exits with png_error). + * + * TODO: deal more elegantly with truncated IDAT lists. + */ + ret = inflate(&png_ptr->zstream, Z_NO_FLUSH); + + /* Take the unconsumed output back (so, in the 'check' case this just + * counts up). + */ + avail_out += png_ptr->zstream.avail_out; + png_ptr->zstream.avail_out = 0; + + if (ret == Z_STREAM_END) + { + /* Do this for safety; we won't read any more into this row. */ + png_ptr->zstream.next_out = NULL; + + png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + + if (png_ptr->zstream.avail_in > 0 || png_ptr->idat_size > 0) + png_chunk_benign_error(png_ptr, "Extra compressed data"); + break; + } + + if (ret != Z_OK) + { + png_zstream_error(png_ptr, ret); + + if (output != NULL) + png_chunk_error(png_ptr, png_ptr->zstream.msg); + + else /* checking */ + { + png_chunk_benign_error(png_ptr, png_ptr->zstream.msg); + return; + } + } + } while (avail_out > 0); + + if (avail_out > 0) + { + /* The stream ended before the image; this is the same as too few IDATs so + * should be handled the same way. + */ + if (output != NULL) + png_error(png_ptr, "Not enough image data"); + + else /* checking */ + png_chunk_benign_error(png_ptr, "Too much image data"); + } +} + +void /* PRIVATE */ +png_read_finish_IDAT(png_structrp png_ptr) +{ + /* We don't need any more data and the stream should have ended, however the + * LZ end code may actually not have been processed. In this case we must + * read it otherwise stray unread IDAT data or, more likely, an IDAT chunk + * may still remain to be consumed. + */ + if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) + { + /* The NULL causes png_read_IDAT_data to swallow any remaining bytes in + * the compressed stream, but the stream may be damaged too, so even after + * this call we may need to terminate the zstream ownership. + */ + png_read_IDAT_data(png_ptr, NULL, 0); + png_ptr->zstream.next_out = NULL; /* safety */ + + /* Now clear everything out for safety; the following may not have been + * done. + */ + if (!(png_ptr->flags & PNG_FLAG_ZSTREAM_ENDED)) + { + png_ptr->mode |= PNG_AFTER_IDAT; + png_ptr->flags |= PNG_FLAG_ZSTREAM_ENDED; + } + } + + /* If the zstream has not been released do it now *and* terminate the reading + * of the final IDAT chunk. + */ + if (png_ptr->zowner == png_IDAT) + { + /* Always do this; the pointers otherwise point into the read buffer. */ + png_ptr->zstream.next_in = NULL; + png_ptr->zstream.avail_in = 0; + + /* Now we no longer own the zstream. */ + png_ptr->zowner = 0; + + /* The slightly weird semantics of the sequential IDAT reading is that we + * are always in or at the end of an IDAT chunk, so we always need to do a + * crc_finish here. If idat_size is non-zero we also need to read the + * spurious bytes at the end of the chunk now. + */ + (void)png_crc_finish(png_ptr, png_ptr->idat_size); + } +} + +void /* PRIVATE */ +png_read_finish_row(png_structrp png_ptr) { #ifdef PNG_READ_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ @@ -3782,9 +4159,9 @@ /* TO DO: don't do this if prev_row isn't needed (requires * read-ahead of the next row's filter byte. */ - png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); + memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); do { png_ptr->pass++; @@ -3814,78 +4191,15 @@ return; } #endif /* PNG_READ_INTERLACING_SUPPORTED */ - if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED)) - { - char extra; - int ret; - - png_ptr->zstream.next_out = (Byte *)&extra; - png_ptr->zstream.avail_out = (uInt)1; - - for (;;) - { - if (!(png_ptr->zstream.avail_in)) - { - while (!png_ptr->idat_size) - { - png_crc_finish(png_ptr, 0); - png_ptr->idat_size = png_read_chunk_header(png_ptr); - if (png_ptr->chunk_name != png_IDAT) - png_error(png_ptr, "Not enough image data"); - } - - png_ptr->zstream.avail_in = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_in = png_ptr->zbuf; - - if (png_ptr->zbuf_size > png_ptr->idat_size) - png_ptr->zstream.avail_in = (uInt)png_ptr->idat_size; - - png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zstream.avail_in); - png_ptr->idat_size -= png_ptr->zstream.avail_in; - } - - ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH); - - if (ret == Z_STREAM_END) - { - if (!(png_ptr->zstream.avail_out) || png_ptr->zstream.avail_in || - png_ptr->idat_size) - png_warning(png_ptr, "Extra compressed data"); - - png_ptr->mode |= PNG_AFTER_IDAT; - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; - break; - } - - if (ret != Z_OK) - png_error(png_ptr, png_ptr->zstream.msg ? png_ptr->zstream.msg : - "Decompression Error"); - - if (!(png_ptr->zstream.avail_out)) - { - png_warning(png_ptr, "Extra compressed data"); - png_ptr->mode |= PNG_AFTER_IDAT; - png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED; - break; - } - - } - png_ptr->zstream.avail_out = 0; - } - - if (png_ptr->idat_size || png_ptr->zstream.avail_in) - png_warning(png_ptr, "Extra compression data"); - - inflateReset(&png_ptr->zstream); - - png_ptr->mode |= PNG_AFTER_IDAT; + /* Here after at the end of the last row of the last pass. */ + png_read_finish_IDAT(png_ptr); } #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ void /* PRIVATE */ -png_read_start_row(png_structp png_ptr) +png_read_start_row(png_structrp png_ptr) { #ifdef PNG_READ_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ @@ -3905,9 +4219,9 @@ int max_pixel_depth; png_size_t row_bytes; png_debug(1, "in png_read_start_row"); - png_ptr->zstream.avail_in = 0; + #ifdef PNG_READ_TRANSFORMS_SUPPORTED png_init_read_transformations(png_ptr); #endif #ifdef PNG_READ_INTERLACING_SUPPORTED @@ -4143,9 +4457,9 @@ #endif if (png_ptr->rowbytes > (PNG_SIZE_MAX - 1)) png_error(png_ptr, "Row has too many bytes to allocate in memory"); - png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); + memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1); png_debug1(3, "width = %u,", png_ptr->width); png_debug1(3, "height = %u,", png_ptr->height); png_debug1(3, "iwidth = %u,", png_ptr->iwidth); @@ -4153,7 +4467,28 @@ png_debug1(3, "rowbytes = %lu,", (unsigned long)png_ptr->rowbytes); png_debug1(3, "irowbytes = %lu", (unsigned long)PNG_ROWBYTES(png_ptr->pixel_depth, png_ptr->iwidth) + 1); + /* The sequential reader needs a buffer for IDAT, but the progressive reader + * does not, so free the read buffer now regardless; the sequential reader + * reallocates it on demand. + */ + if (png_ptr->read_buffer) + { + png_bytep buffer = png_ptr->read_buffer; + + png_ptr->read_buffer_size = 0; + png_ptr->read_buffer = NULL; + png_free(png_ptr, buffer); + } + + /* Finally claim the zstream for the inflate of the IDAT data, use the bits + * value from the stream (note that this will result in a fatal error if the + * IDAT stream has a bogus deflate header window_bits value, but this should + * not be happening any longer!) + */ + if (png_inflate_claim(png_ptr, png_IDAT, 0) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); + png_ptr->flags |= PNG_FLAG_ROW_INIT; } #endif /* PNG_READ_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/pngset.c libpng-1.6.0beta32/pngset.c --- libpng-1.5.13/pngset.c 2012-09-27 06:21:19.763776038 -0500 +++ libpng-1.6.0beta32/pngset.c 2012-11-25 12:40:10.141508572 -0600 @@ -1,8 +1,8 @@ /* pngset.c - storage of image information into info struct * - * Last changed in libpng 1.5.11 [June 14, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -21,86 +21,85 @@ #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) #ifdef PNG_bKGD_SUPPORTED void PNGAPI -png_set_bKGD(png_structp png_ptr, png_infop info_ptr, +png_set_bKGD(png_const_structrp png_ptr, png_inforp info_ptr, png_const_color_16p background) { png_debug1(1, "in %s storage function", "bKGD"); - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || background == NULL) return; - png_memcpy(&(info_ptr->background), background, png_sizeof(png_color_16)); + info_ptr->background = *background; info_ptr->valid |= PNG_INFO_bKGD; } #endif #ifdef PNG_cHRM_SUPPORTED void PNGFAPI -png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr, +png_set_cHRM_fixed(png_const_structrp png_ptr, png_inforp info_ptr, png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x, png_fixed_point blue_y) { + png_xy xy; + png_debug1(1, "in %s storage function", "cHRM fixed"); if (png_ptr == NULL || info_ptr == NULL) return; -# ifdef PNG_CHECK_cHRM_SUPPORTED - if (png_check_cHRM_fixed(png_ptr, - white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y)) -# endif - { - info_ptr->x_white = white_x; - info_ptr->y_white = white_y; - info_ptr->x_red = red_x; - info_ptr->y_red = red_y; - info_ptr->x_green = green_x; - info_ptr->y_green = green_y; - info_ptr->x_blue = blue_x; - info_ptr->y_blue = blue_y; - info_ptr->valid |= PNG_INFO_cHRM; - } + xy.redx = red_x; + xy.redy = red_y; + xy.greenx = green_x; + xy.greeny = green_y; + xy.bluex = blue_x; + xy.bluey = blue_y; + xy.whitex = white_x; + xy.whitey = white_y; + + if (png_colorspace_set_chromaticities(png_ptr, &info_ptr->colorspace, &xy, + 2/* override with app values*/)) + info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; + + png_colorspace_sync_info(png_ptr, info_ptr); } void PNGFAPI -png_set_cHRM_XYZ_fixed(png_structp png_ptr, png_infop info_ptr, +png_set_cHRM_XYZ_fixed(png_const_structrp png_ptr, png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, png_fixed_point int_red_Z, png_fixed_point int_green_X, png_fixed_point int_green_Y, png_fixed_point int_green_Z, png_fixed_point int_blue_X, png_fixed_point int_blue_Y, png_fixed_point int_blue_Z) { png_XYZ XYZ; - png_xy xy; png_debug1(1, "in %s storage function", "cHRM XYZ fixed"); if (png_ptr == NULL || info_ptr == NULL) return; - XYZ.redX = int_red_X; - XYZ.redY = int_red_Y; - XYZ.redZ = int_red_Z; - XYZ.greenX = int_green_X; - XYZ.greenY = int_green_Y; - XYZ.greenZ = int_green_Z; - XYZ.blueX = int_blue_X; - XYZ.blueY = int_blue_Y; - XYZ.blueZ = int_blue_Z; + XYZ.red_X = int_red_X; + XYZ.red_Y = int_red_Y; + XYZ.red_Z = int_red_Z; + XYZ.green_X = int_green_X; + XYZ.green_Y = int_green_Y; + XYZ.green_Z = int_green_Z; + XYZ.blue_X = int_blue_X; + XYZ.blue_Y = int_blue_Y; + XYZ.blue_Z = int_blue_Z; - if (png_xy_from_XYZ(&xy, XYZ)) - png_error(png_ptr, "XYZ values out of representable range"); + if (png_colorspace_set_endpoints(png_ptr, &info_ptr->colorspace, &XYZ, 2)) + info_ptr->colorspace.flags |= PNG_COLORSPACE_FROM_cHRM; - png_set_cHRM_fixed(png_ptr, info_ptr, xy.whitex, xy.whitey, xy.redx, xy.redy, - xy.greenx, xy.greeny, xy.bluex, xy.bluey); + png_colorspace_sync_info(png_ptr, info_ptr); } # ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI -png_set_cHRM(png_structp png_ptr, png_infop info_ptr, +png_set_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, double white_x, double white_y, double red_x, double red_y, double green_x, double green_y, double blue_x, double blue_y) { png_set_cHRM_fixed(png_ptr, info_ptr, @@ -114,9 +113,9 @@ png_fixed(png_ptr, blue_y, "cHRM Blue Y")); } void PNGAPI -png_set_cHRM_XYZ(png_structp png_ptr, png_infop info_ptr, double red_X, +png_set_cHRM_XYZ(png_const_structrp png_ptr, png_inforp info_ptr, double red_X, double red_Y, double red_Z, double green_X, double green_Y, double green_Z, double blue_X, double blue_Y, double blue_Z) { png_set_cHRM_XYZ_fixed(png_ptr, info_ptr, @@ -135,37 +134,23 @@ #endif /* PNG_cHRM_SUPPORTED */ #ifdef PNG_gAMA_SUPPORTED void PNGFAPI -png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point - file_gamma) +png_set_gAMA_fixed(png_const_structrp png_ptr, png_inforp info_ptr, + png_fixed_point file_gamma) { png_debug1(1, "in %s storage function", "gAMA"); if (png_ptr == NULL || info_ptr == NULL) return; - /* Changed in libpng-1.5.4 to limit the values to ensure overflow can't - * occur. Since the fixed point representation is assymetrical it is - * possible for 1/gamma to overflow the limit of 21474 and this means the - * gamma value must be at least 5/100000 and hence at most 20000.0. For - * safety the limits here are a little narrower. The values are 0.00016 to - * 6250.0, which are truly ridiculous gamma values (and will produce - * displays that are all black or all white.) - */ - if (file_gamma < 16 || file_gamma > 625000000) - png_warning(png_ptr, "Out of range gamma value ignored"); - - else - { - info_ptr->gamma = file_gamma; - info_ptr->valid |= PNG_INFO_gAMA; - } + png_colorspace_set_gamma(png_ptr, &info_ptr->colorspace, file_gamma); + png_colorspace_sync_info(png_ptr, info_ptr); } # ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI -png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma) +png_set_gAMA(png_const_structrp png_ptr, png_inforp info_ptr, double file_gamma) { png_set_gAMA_fixed(png_ptr, info_ptr, png_fixed(png_ptr, file_gamma, "png_set_gAMA")); } @@ -173,9 +158,10 @@ #endif #ifdef PNG_hIST_SUPPORTED void PNGAPI -png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_const_uint_16p hist) +png_set_hIST(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_uint_16p hist) { int i; png_debug1(1, "in %s storage function", "hIST"); @@ -196,28 +182,28 @@ /* Changed from info->num_palette to PNG_MAX_PALETTE_LENGTH in * version 1.2.1 */ - png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr, - PNG_MAX_PALETTE_LENGTH * png_sizeof(png_uint_16)); + info_ptr->hist = png_voidcast(png_uint_16p, png_malloc_warn(png_ptr, + PNG_MAX_PALETTE_LENGTH * (sizeof (png_uint_16)))); - if (png_ptr->hist == NULL) + if (info_ptr->hist == NULL) { png_warning(png_ptr, "Insufficient memory for hIST chunk data"); return; } + info_ptr->free_me |= PNG_FREE_HIST; + for (i = 0; i < info_ptr->num_palette; i++) - png_ptr->hist[i] = hist[i]; + info_ptr->hist[i] = hist[i]; - info_ptr->hist = png_ptr->hist; info_ptr->valid |= PNG_INFO_hIST; - info_ptr->free_me |= PNG_FREE_HIST; } #endif void PNGAPI -png_set_IHDR(png_structp png_ptr, png_infop info_ptr, +png_set_IHDR(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int interlace_type, int compression_type, int filter_type) { @@ -265,9 +251,9 @@ } #ifdef PNG_oFFs_SUPPORTED void PNGAPI -png_set_oFFs(png_structp png_ptr, png_infop info_ptr, +png_set_oFFs(png_const_structrp png_ptr, png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y, int unit_type) { png_debug1(1, "in %s storage function", "oFFs"); @@ -282,21 +268,22 @@ #endif #ifdef PNG_pCAL_SUPPORTED void PNGAPI -png_set_pCAL(png_structp png_ptr, png_infop info_ptr, +png_set_pCAL(png_const_structrp png_ptr, png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_const_charp units, png_charpp params) { png_size_t length; int i; png_debug1(1, "in %s storage function", "pCAL"); - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || purpose == NULL || units == NULL + || (nparams > 0 && params == NULL)) return; - length = png_strlen(purpose) + 1; + length = strlen(purpose) + 1; png_debug1(3, "allocating purpose for info (%lu bytes)", (unsigned long)length); /* TODO: validate format of calibration name and unit name */ @@ -304,57 +291,63 @@ /* Check that the type matches the specification. */ if (type < 0 || type > 3) png_error(png_ptr, "Invalid pCAL equation type"); + if (nparams < 0 || nparams > 255) + png_error(png_ptr, "Invalid pCAL parameter count"); + /* Validate params[nparams] */ for (i=0; ipcal_purpose = (png_charp)png_malloc_warn(png_ptr, length); + info_ptr->pcal_purpose = png_voidcast(png_charp, + png_malloc_warn(png_ptr, length)); if (info_ptr->pcal_purpose == NULL) { png_warning(png_ptr, "Insufficient memory for pCAL purpose"); return; } - png_memcpy(info_ptr->pcal_purpose, purpose, length); + memcpy(info_ptr->pcal_purpose, purpose, length); png_debug(3, "storing X0, X1, type, and nparams in info"); info_ptr->pcal_X0 = X0; info_ptr->pcal_X1 = X1; info_ptr->pcal_type = (png_byte)type; info_ptr->pcal_nparams = (png_byte)nparams; - length = png_strlen(units) + 1; + length = strlen(units) + 1; png_debug1(3, "allocating units for info (%lu bytes)", (unsigned long)length); - info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length); + info_ptr->pcal_units = png_voidcast(png_charp, + png_malloc_warn(png_ptr, length)); if (info_ptr->pcal_units == NULL) { png_warning(png_ptr, "Insufficient memory for pCAL units"); return; } - png_memcpy(info_ptr->pcal_units, units, length); + memcpy(info_ptr->pcal_units, units, length); - info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr, - (png_size_t)((nparams + 1) * png_sizeof(png_charp))); + info_ptr->pcal_params = png_voidcast(png_charpp, png_malloc_warn(png_ptr, + (png_size_t)((nparams + 1) * (sizeof (png_charp))))); if (info_ptr->pcal_params == NULL) { png_warning(png_ptr, "Insufficient memory for pCAL params"); return; } - png_memset(info_ptr->pcal_params, 0, (nparams + 1) * png_sizeof(png_charp)); + memset(info_ptr->pcal_params, 0, (nparams + 1) * (sizeof (png_charp))); for (i = 0; i < nparams; i++) { - length = png_strlen(params[i]) + 1; + length = strlen(params[i]) + 1; png_debug2(3, "allocating parameter %d for info (%lu bytes)", i, (unsigned long)length); info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length); @@ -364,9 +357,9 @@ png_warning(png_ptr, "Insufficient memory for pCAL parameter"); return; } - png_memcpy(info_ptr->pcal_params[i], params[i], length); + memcpy(info_ptr->pcal_params[i], params[i], length); } info_ptr->valid |= PNG_INFO_pCAL; info_ptr->free_me |= PNG_FREE_PCAL; @@ -374,9 +367,9 @@ #endif #ifdef PNG_sCAL_SUPPORTED void PNGAPI -png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr, +png_set_sCAL_s(png_const_structrp png_ptr, png_inforp info_ptr, int unit, png_const_charp swidth, png_const_charp sheight) { png_size_t lengthw = 0, lengthh = 0; @@ -390,13 +383,13 @@ */ if (unit != 1 && unit != 2) png_error(png_ptr, "Invalid sCAL unit"); - if (swidth == NULL || (lengthw = png_strlen(swidth)) == 0 || + if (swidth == NULL || (lengthw = strlen(swidth)) == 0 || swidth[0] == 45 /* '-' */ || !png_check_fp_string(swidth, lengthw)) png_error(png_ptr, "Invalid sCAL width"); - if (sheight == NULL || (lengthh = png_strlen(sheight)) == 0 || + if (sheight == NULL || (lengthh = strlen(sheight)) == 0 || sheight[0] == 45 /* '-' */ || !png_check_fp_string(sheight, lengthh)) png_error(png_ptr, "Invalid sCAL height"); info_ptr->scal_unit = (png_byte)unit; @@ -404,23 +397,25 @@ ++lengthw; png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthw); - info_ptr->scal_s_width = (png_charp)png_malloc_warn(png_ptr, lengthw); + info_ptr->scal_s_width = png_voidcast(png_charp, + png_malloc_warn(png_ptr, lengthw)); if (info_ptr->scal_s_width == NULL) { png_warning(png_ptr, "Memory allocation failed while processing sCAL"); return; } - png_memcpy(info_ptr->scal_s_width, swidth, lengthw); + memcpy(info_ptr->scal_s_width, swidth, lengthw); ++lengthh; png_debug1(3, "allocating unit for info (%u bytes)", (unsigned int)lengthh); - info_ptr->scal_s_height = (png_charp)png_malloc_warn(png_ptr, lengthh); + info_ptr->scal_s_height = png_voidcast(png_charp, + png_malloc_warn(png_ptr, lengthh)); if (info_ptr->scal_s_height == NULL) { png_free (png_ptr, info_ptr->scal_s_width); @@ -429,18 +424,18 @@ png_warning(png_ptr, "Memory allocation failed while processing sCAL"); return; } - png_memcpy(info_ptr->scal_s_height, sheight, lengthh); + memcpy(info_ptr->scal_s_height, sheight, lengthh); info_ptr->valid |= PNG_INFO_sCAL; info_ptr->free_me |= PNG_FREE_SCAL; } # ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI -png_set_sCAL(png_structp png_ptr, png_infop info_ptr, int unit, double width, - double height) +png_set_sCAL(png_const_structrp png_ptr, png_inforp info_ptr, int unit, + double width, double height) { png_debug1(1, "in %s storage function", "sCAL"); /* Check the arguments. */ @@ -455,11 +450,11 @@ /* Convert 'width' and 'height' to ASCII. */ char swidth[PNG_sCAL_MAX_DIGITS+1]; char sheight[PNG_sCAL_MAX_DIGITS+1]; - png_ascii_from_fp(png_ptr, swidth, sizeof swidth, width, + png_ascii_from_fp(png_ptr, swidth, (sizeof swidth), width, PNG_sCAL_PRECISION); - png_ascii_from_fp(png_ptr, sheight, sizeof sheight, height, + png_ascii_from_fp(png_ptr, sheight, (sizeof sheight), height, PNG_sCAL_PRECISION); png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); } @@ -467,9 +462,9 @@ # endif # ifdef PNG_FIXED_POINT_SUPPORTED void PNGAPI -png_set_sCAL_fixed(png_structp png_ptr, png_infop info_ptr, int unit, +png_set_sCAL_fixed(png_const_structrp png_ptr, png_inforp info_ptr, int unit, png_fixed_point width, png_fixed_point height) { png_debug1(1, "in %s storage function", "sCAL"); @@ -485,10 +480,10 @@ /* Convert 'width' and 'height' to ASCII. */ char swidth[PNG_sCAL_MAX_DIGITS+1]; char sheight[PNG_sCAL_MAX_DIGITS+1]; - png_ascii_from_fixed(png_ptr, swidth, sizeof swidth, width); - png_ascii_from_fixed(png_ptr, sheight, sizeof sheight, height); + png_ascii_from_fixed(png_ptr, swidth, (sizeof swidth), width); + png_ascii_from_fixed(png_ptr, sheight, (sizeof sheight), height); png_set_sCAL_s(png_ptr, info_ptr, unit, swidth, sheight); } } @@ -496,9 +491,9 @@ #endif #ifdef PNG_pHYs_SUPPORTED void PNGAPI -png_set_pHYs(png_structp png_ptr, png_infop info_ptr, +png_set_pHYs(png_const_structrp png_ptr, png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type) { png_debug1(1, "in %s storage function", "pHYs"); @@ -512,15 +507,15 @@ } #endif void PNGAPI -png_set_PLTE(png_structp png_ptr, png_infop info_ptr, +png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_const_colorp palette, int num_palette) { png_debug1(1, "in %s storage function", "PLTE"); - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || palette == NULL) return; if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH) { @@ -536,19 +531,22 @@ /* It may not actually be necessary to set png_ptr->palette here; * we do it for backward compatibility with the way the png_handle_tRNS * function used to do the allocation. + * + * 1.6.0: the above statement appears to be incorrect; something has to set + * the palette inside png_struct on read. */ png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead * of num_palette entries, in case of an invalid PNG file that has * too-large sample values. */ - png_ptr->palette = (png_colorp)png_calloc(png_ptr, - PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color)); + png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, + PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); - png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color)); + memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); info_ptr->palette = png_ptr->palette; info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; info_ptr->free_me |= PNG_FREE_PLTE; @@ -557,65 +555,58 @@ } #ifdef PNG_sBIT_SUPPORTED void PNGAPI -png_set_sBIT(png_structp png_ptr, png_infop info_ptr, +png_set_sBIT(png_const_structrp png_ptr, png_inforp info_ptr, png_const_color_8p sig_bit) { png_debug1(1, "in %s storage function", "sBIT"); - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || sig_bit == NULL) return; - png_memcpy(&(info_ptr->sig_bit), sig_bit, png_sizeof(png_color_8)); + info_ptr->sig_bit = *sig_bit; info_ptr->valid |= PNG_INFO_sBIT; } #endif #ifdef PNG_sRGB_SUPPORTED void PNGAPI -png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int srgb_intent) +png_set_sRGB(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) { png_debug1(1, "in %s storage function", "sRGB"); if (png_ptr == NULL || info_ptr == NULL) return; - info_ptr->srgb_intent = (png_byte)srgb_intent; - info_ptr->valid |= PNG_INFO_sRGB; + (void)png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent); + png_colorspace_sync_info(png_ptr, info_ptr); } void PNGAPI -png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr, +png_set_sRGB_gAMA_and_cHRM(png_const_structrp png_ptr, png_inforp info_ptr, int srgb_intent) { png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM"); if (png_ptr == NULL || info_ptr == NULL) return; - png_set_sRGB(png_ptr, info_ptr, srgb_intent); - -# ifdef PNG_gAMA_SUPPORTED - png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE); -# endif + if (png_colorspace_set_sRGB(png_ptr, &info_ptr->colorspace, srgb_intent)) + { + /* This causes the gAMA and cHRM to be written too */ + info_ptr->colorspace.flags |= + PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; + } -# ifdef PNG_cHRM_SUPPORTED - png_set_cHRM_fixed(png_ptr, info_ptr, - /* color x y */ - /* white */ 31270, 32900, - /* red */ 64000, 33000, - /* green */ 30000, 60000, - /* blue */ 15000, 6000 - ); -# endif /* cHRM */ + png_colorspace_sync_info(png_ptr, info_ptr); } #endif /* sRGB */ #ifdef PNG_iCCP_SUPPORTED void PNGAPI -png_set_iCCP(png_structp png_ptr, png_infop info_ptr, +png_set_iCCP(png_const_structrp png_ptr, png_inforp info_ptr, png_const_charp name, int compression_type, png_const_bytep profile, png_uint_32 proflen) { png_charp new_iccp_name; @@ -626,48 +617,69 @@ if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL) return; - length = png_strlen(name)+1; - new_iccp_name = (png_charp)png_malloc_warn(png_ptr, length); + if (compression_type != PNG_COMPRESSION_TYPE_BASE) + png_app_error(png_ptr, "Invalid iCCP compression method"); + + /* Set the colorspace first because this validates the profile; do not + * override previously set app cHRM or gAMA here (because likely as not the + * application knows better than libpng what the correct values are.) Pass + * the info_ptr color_type field to png_colorspace_set_ICC because in the + * write case it has not yet been stored in png_ptr. + */ + { + int result = png_colorspace_set_ICC(png_ptr, &info_ptr->colorspace, name, + proflen, profile, info_ptr->color_type); + + png_colorspace_sync_info(png_ptr, info_ptr); + + /* Don't do any of the copying if the profile was bad, or inconsistent. */ + if (!result) + return; + + /* But do write the gAMA and cHRM chunks from the profile. */ + info_ptr->colorspace.flags |= + PNG_COLORSPACE_FROM_gAMA|PNG_COLORSPACE_FROM_cHRM; + } + + length = strlen(name)+1; + new_iccp_name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); if (new_iccp_name == NULL) { - png_warning(png_ptr, "Insufficient memory to process iCCP chunk"); + png_benign_error(png_ptr, "Insufficient memory to process iCCP chunk"); return; } - png_memcpy(new_iccp_name, name, length); - new_iccp_profile = (png_bytep)png_malloc_warn(png_ptr, proflen); + memcpy(new_iccp_name, name, length); + new_iccp_profile = png_voidcast(png_bytep, + png_malloc_warn(png_ptr, proflen)); if (new_iccp_profile == NULL) { png_free (png_ptr, new_iccp_name); - png_warning(png_ptr, + png_benign_error(png_ptr, "Insufficient memory to process iCCP profile"); return; } - png_memcpy(new_iccp_profile, profile, (png_size_t)proflen); + memcpy(new_iccp_profile, profile, proflen); png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0); info_ptr->iccp_proflen = proflen; info_ptr->iccp_name = new_iccp_name; info_ptr->iccp_profile = new_iccp_profile; - /* Compression is always zero but is here so the API and info structure - * does not have to change if we introduce multiple compression types - */ - info_ptr->iccp_compression = (png_byte)compression_type; info_ptr->free_me |= PNG_FREE_ICCP; info_ptr->valid |= PNG_INFO_iCCP; } #endif #ifdef PNG_TEXT_SUPPORTED void PNGAPI -png_set_text(png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr, - int num_text) +png_set_text(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_textp text_ptr, int num_text) { int ret; ret = png_set_text_2(png_ptr, info_ptr, text_ptr, num_text); @@ -675,9 +687,9 @@ png_error(png_ptr, "Insufficient memory to store text"); } int /* PRIVATE */ -png_set_text_2(png_structp png_ptr, png_infop info_ptr, +png_set_text_2(png_const_structrp png_ptr, png_inforp info_ptr, png_const_textp text_ptr, int num_text) { int i; @@ -702,9 +714,9 @@ info_ptr->max_text = info_ptr->num_text + num_text + 8; old_text = info_ptr->text; info_ptr->text = (png_textp)png_malloc_warn(png_ptr, - (png_size_t)(info_ptr->max_text * png_sizeof(png_text))); + (png_size_t)(info_ptr->max_text * (sizeof (png_text)))); if (info_ptr->text == NULL) { /* Restore to previous condition */ @@ -712,19 +724,19 @@ info_ptr->text = old_text; return(1); } - png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max_text * - png_sizeof(png_text))); + memcpy(info_ptr->text, old_text, (png_size_t)(old_max_text * + (sizeof (png_text)))); png_free(png_ptr, old_text); } else { info_ptr->max_text = num_text + 8; info_ptr->num_text = 0; info_ptr->text = (png_textp)png_malloc_warn(png_ptr, - (png_size_t)(info_ptr->max_text * png_sizeof(png_text))); + (png_size_t)(info_ptr->max_text * (sizeof (png_text)))); if (info_ptr->text == NULL) { /* Restore to previous condition */ info_ptr->num_text = old_num_text; @@ -752,9 +764,9 @@ png_warning(png_ptr, "text compression mode is out of range"); continue; } - key_len = png_strlen(text_ptr[i].key); + key_len = strlen(text_ptr[i].key); if (text_ptr[i].compression <= 0) { lang_len = 0; @@ -766,15 +778,15 @@ { /* Set iTXt data */ if (text_ptr[i].lang != NULL) - lang_len = png_strlen(text_ptr[i].lang); + lang_len = strlen(text_ptr[i].lang); else lang_len = 0; if (text_ptr[i].lang_key != NULL) - lang_key_len = png_strlen(text_ptr[i].lang_key); + lang_key_len = strlen(text_ptr[i].lang_key); else lang_key_len = 0; } @@ -798,9 +810,9 @@ } else { - text_length = png_strlen(text_ptr[i].text); + text_length = strlen(text_ptr[i].text); textp->compression = text_ptr[i].compression; } textp->key = (png_charp)png_malloc_warn(png_ptr, @@ -814,18 +826,18 @@ (unsigned long)(png_uint_32) (key_len + lang_len + lang_key_len + text_length + 4), textp->key); - png_memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len)); + memcpy(textp->key, text_ptr[i].key,(png_size_t)(key_len)); *(textp->key + key_len) = '\0'; if (text_ptr[i].compression > 0) { textp->lang = textp->key + key_len + 1; - png_memcpy(textp->lang, text_ptr[i].lang, lang_len); + memcpy(textp->lang, text_ptr[i].lang, lang_len); *(textp->lang + lang_len) = '\0'; textp->lang_key = textp->lang + lang_len + 1; - png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); + memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len); *(textp->lang_key + lang_key_len) = '\0'; textp->text = textp->lang_key + lang_key_len + 1; } @@ -836,9 +848,9 @@ textp->text = textp->key + key_len + 1; } if (text_length) - png_memcpy(textp->text, text_ptr[i].text, + memcpy(textp->text, text_ptr[i].text, (png_size_t)(text_length)); *(textp->text + text_length) = '\0'; @@ -864,13 +876,14 @@ #endif #ifdef PNG_tIME_SUPPORTED void PNGAPI -png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time) +png_set_tIME(png_const_structrp png_ptr, png_inforp info_ptr, + png_const_timep mod_time) { png_debug1(1, "in %s storage function", "tIME"); - if (png_ptr == NULL || info_ptr == NULL || + if (png_ptr == NULL || info_ptr == NULL || mod_time == NULL || (png_ptr->mode & PNG_WROTE_tIME)) return; if (mod_time->month == 0 || mod_time->month > 12 || @@ -881,16 +894,16 @@ png_warning(png_ptr, "Ignoring invalid time value"); return; } - png_memcpy(&(info_ptr->mod_time), mod_time, png_sizeof(png_time)); + info_ptr->mod_time = *mod_time; info_ptr->valid |= PNG_INFO_tIME; } #endif #ifdef PNG_tRNS_SUPPORTED void PNGAPI -png_set_tRNS(png_structp png_ptr, png_infop info_ptr, +png_set_tRNS(png_structrp png_ptr, png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color) { png_debug1(1, "in %s storage function", "tRNS"); @@ -901,35 +914,38 @@ { /* It may not actually be necessary to set png_ptr->trans_alpha here; * we do it for backward compatibility with the way the png_handle_tRNS * function used to do the allocation. + * + * 1.6.0: The above statement is incorrect; png_handle_tRNS effectively + * relies on png_set_tRNS storing the information in png_struct + * (otherwise it won't be there for the code in pngrtran.c). */ png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0); /* Changed from num_trans to PNG_MAX_PALETTE_LENGTH in version 1.2.1 */ - png_ptr->trans_alpha = info_ptr->trans_alpha = - (png_bytep)png_malloc(png_ptr, (png_size_t)PNG_MAX_PALETTE_LENGTH); + png_ptr->trans_alpha = info_ptr->trans_alpha = png_voidcast(png_bytep, + png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH)); if (num_trans > 0 && num_trans <= PNG_MAX_PALETTE_LENGTH) - png_memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); + memcpy(info_ptr->trans_alpha, trans_alpha, (png_size_t)num_trans); } if (trans_color != NULL) { int sample_max = (1 << info_ptr->bit_depth); if ((info_ptr->color_type == PNG_COLOR_TYPE_GRAY && - (int)trans_color->gray > sample_max) || + trans_color->gray > sample_max) || (info_ptr->color_type == PNG_COLOR_TYPE_RGB && - ((int)trans_color->red > sample_max || - (int)trans_color->green > sample_max || - (int)trans_color->blue > sample_max))) + (trans_color->red > sample_max || + trans_color->green > sample_max || + trans_color->blue > sample_max))) png_warning(png_ptr, "tRNS chunk has out-of-range samples for bit_depth"); - png_memcpy(&(info_ptr->trans_color), trans_color, - png_sizeof(png_color_16)); + info_ptr->trans_color = *trans_color; if (num_trans == 0) num_trans = 1; } @@ -945,10 +961,10 @@ #endif #ifdef PNG_sPLT_SUPPORTED void PNGAPI -png_set_sPLT(png_structp png_ptr, - png_infop info_ptr, png_const_sPLT_tp entries, int nentries) +png_set_sPLT(png_const_structrp png_ptr, + png_inforp info_ptr, png_const_sPLT_tp entries, int nentries) /* * entries - array of png_sPLT_t structures * to be added to the list of palettes * in the info structure. @@ -959,58 +975,69 @@ { png_sPLT_tp np; int i; - if (png_ptr == NULL || info_ptr == NULL) + if (png_ptr == NULL || info_ptr == NULL || nentries <= 0 || + entries == NULL) return; - np = (png_sPLT_tp)png_malloc_warn(png_ptr, - (info_ptr->splt_palettes_num + nentries) * - (png_size_t)png_sizeof(png_sPLT_t)); + np = png_voidcast(png_sPLT_tp, png_malloc_warn(png_ptr, + (info_ptr->splt_palettes_num + nentries) * (sizeof (png_sPLT_t)))); if (np == NULL) { png_warning(png_ptr, "No memory for sPLT palettes"); return; } - png_memcpy(np, info_ptr->splt_palettes, - info_ptr->splt_palettes_num * png_sizeof(png_sPLT_t)); + memcpy(np, info_ptr->splt_palettes, + info_ptr->splt_palettes_num * (sizeof (png_sPLT_t))); png_free(png_ptr, info_ptr->splt_palettes); info_ptr->splt_palettes=NULL; + /* TODO: fix this, it apparently leaves NULL entries in the event of OOM + * below. + */ for (i = 0; i < nentries; i++) { png_sPLT_tp to = np + info_ptr->splt_palettes_num + i; png_const_sPLT_tp from = entries + i; png_size_t length; - length = png_strlen(from->name) + 1; - to->name = (png_charp)png_malloc_warn(png_ptr, length); + /* In event of error below the name and entries fields must be set to + * NULL, otherwise libpng will crash later on while trying to free the + * uninitialized pointers. + */ + memset(to, 0, (sizeof *to)); + + if (from->name == NULL || from->entries == NULL) + continue; + + length = strlen(from->name) + 1; + to->name = png_voidcast(png_charp, png_malloc_warn(png_ptr, length)); if (to->name == NULL) { png_warning(png_ptr, "Out of memory while processing sPLT chunk"); continue; } - png_memcpy(to->name, from->name, length); - to->entries = (png_sPLT_entryp)png_malloc_warn(png_ptr, - from->nentries * png_sizeof(png_sPLT_entry)); + memcpy(to->name, from->name, length); + to->entries = png_voidcast(png_sPLT_entryp, png_malloc_warn(png_ptr, + from->nentries * (sizeof (png_sPLT_entry)))); if (to->entries == NULL) { - png_warning(png_ptr, - "Out of memory while processing sPLT chunk"); + png_warning(png_ptr, "Out of memory while processing sPLT chunk"); png_free(png_ptr, to->name); to->name = NULL; continue; } - png_memcpy(to->entries, from->entries, - from->nentries * png_sizeof(png_sPLT_entry)); + memcpy(to->entries, from->entries, + from->nentries * (sizeof (png_sPLT_entry))); to->nentries = from->nentries; to->depth = from->depth; } @@ -1021,158 +1048,343 @@ info_ptr->free_me |= PNG_FREE_SPLT; } #endif /* PNG_sPLT_SUPPORTED */ -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED +#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED +static png_byte +check_location(png_const_structrp png_ptr, int location) +{ + location &= (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT); + + /* New in 1.6.0; copy the location and check it. This is an API + * change, previously the app had to use the + * png_set_unknown_chunk_location API below for each chunk. + */ + if (location == 0 && !(png_ptr->mode & PNG_IS_READ_STRUCT)) + { + /* Write struct, so unknown chunks come from the app */ + png_app_warning(png_ptr, + "png_set_unknown_chunks now expects a valid location"); + /* Use the old behavior */ + location = (png_byte)(png_ptr->mode & + (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)); + } + + if (location == 0) + png_error(png_ptr, "invalid location in png_set_unknown_chunks"); + + /* Now reduce the location to the top-most set bit by removing each least + * significant bit in turn. + */ + while (location != (location & -location)) + location &= ~(location & -location); + + /* The cast is safe because 'location' is a bit mask and only the low four + * bits are significant. + */ + return (png_byte)location; +} + void PNGAPI -png_set_unknown_chunks(png_structp png_ptr, - png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) +png_set_unknown_chunks(png_const_structrp png_ptr, + png_inforp info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns) { png_unknown_chunkp np; - int i; - if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0) + if (png_ptr == NULL || info_ptr == NULL || num_unknowns <= 0) return; - np = (png_unknown_chunkp)png_malloc_warn(png_ptr, - (png_size_t)(info_ptr->unknown_chunks_num + num_unknowns) * - png_sizeof(png_unknown_chunk)); - - if (np == NULL) + /* Check for the failure cases where support has been disabled at compile + * time. This code is hardly ever compiled - it's here because + * STORE_UNKNOWN_CHUNKS is set by both read and write code (compiling in this + * code) but may be meaningless if the read or write handling of unknown + * chunks is not compiled in. + */ +# if !(defined PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) && \ + (defined PNG_READ_SUPPORTED) + if (png_ptr->mode & PNG_IS_READ_STRUCT) { - png_warning(png_ptr, - "Out of memory while processing unknown chunk"); + png_app_error(png_ptr, "no unknown chunk support on read"); return; } - - png_memcpy(np, info_ptr->unknown_chunks, - (png_size_t)info_ptr->unknown_chunks_num * - png_sizeof(png_unknown_chunk)); - - png_free(png_ptr, info_ptr->unknown_chunks); - info_ptr->unknown_chunks = NULL; - - for (i = 0; i < num_unknowns; i++) +# endif +# if !(defined PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED) && \ + (defined PNG_WRITE_SUPPORTED) + if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) { - png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i; - png_const_unknown_chunkp from = unknowns + i; + png_app_error(png_ptr, "no unknown chunk support on write"); + return; + } +# endif - png_memcpy(to->name, from->name, png_sizeof(from->name)); - to->name[png_sizeof(to->name)-1] = '\0'; - to->size = from->size; + /* Prior to 1.6.0 this code used png_malloc_warn, however this meant that + * unknown critical chunks could be lost with just a warning resulting in + * undefined behavior. Changing to png_malloc fixes this by producing a + * png_error. The (png_size_t) cast was also removed as it hides a potential + * overflow. + * + * TODO: fix the potential overflow in the multiply + */ + np = png_voidcast(png_unknown_chunkp, png_malloc(png_ptr, + (info_ptr->unknown_chunks_num + (unsigned int)num_unknowns) * + (sizeof (png_unknown_chunk)))); - /* Note our location in the read or write sequence */ - to->location = (png_byte)(png_ptr->mode & 0xff); + memcpy(np, info_ptr->unknown_chunks, + info_ptr->unknown_chunks_num * (sizeof (png_unknown_chunk))); - if (from->size == 0) - to->data=NULL; + png_free(png_ptr, info_ptr->unknown_chunks); + info_ptr->unknown_chunks = np; /* safe because it is initialized */ + info_ptr->free_me |= PNG_FREE_UNKN; - else - { - to->data = (png_bytep)png_malloc_warn(png_ptr, - (png_size_t)from->size); + np += info_ptr->unknown_chunks_num; - if (to->data == NULL) + /* Increment unknown_chunks_num each time round the loop to protect the + * just-allocated chunk data. + */ + for (; --num_unknowns >= 0; + ++np, ++unknowns, ++(info_ptr->unknown_chunks_num)) { - png_warning(png_ptr, - "Out of memory while processing unknown chunk"); - to->size = 0; - } + memcpy(np->name, unknowns->name, (sizeof unknowns->name)); + np->name[(sizeof np->name)-1] = '\0'; + np->size = unknowns->size; + np->location = check_location(png_ptr, unknowns->location); + + if (unknowns->size == 0) + np->data = NULL; else - png_memcpy(to->data, from->data, from->size); + { + /* png_error is safe here because the list is stored in png_ptr */ + np->data = png_voidcast(png_bytep, + png_malloc(png_ptr, unknowns->size)); + memcpy(np->data, unknowns->data, unknowns->size); } } - - info_ptr->unknown_chunks = np; - info_ptr->unknown_chunks_num += num_unknowns; - info_ptr->free_me |= PNG_FREE_UNKN; } void PNGAPI -png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr, +png_set_unknown_chunk_location(png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location) { - if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk < - info_ptr->unknown_chunks_num) - info_ptr->unknown_chunks[chunk].location = (png_byte)location; + /* This API is pretty pointless in 1.6.0 because the location can be set + * before the call to png_set_unknown_chunks. + * + * TODO: add a png_app_warning in 1.7 + */ + if (png_ptr != NULL && info_ptr != NULL && chunk >= 0 && + (unsigned int)chunk < info_ptr->unknown_chunks_num) + { + if ((location & (PNG_HAVE_IHDR|PNG_HAVE_PLTE|PNG_AFTER_IDAT)) == 0) + { + png_app_error(png_ptr, "invalid unknown chunk location"); + /* Fake out the pre 1.6.0 behavior: */ + if ((location & PNG_HAVE_IDAT)) /* undocumented! */ + location = PNG_AFTER_IDAT; + + else + location = PNG_HAVE_IHDR; /* also undocumented */ + } + + info_ptr->unknown_chunks[chunk].location = + check_location(png_ptr, location); + } } #endif #ifdef PNG_MNG_FEATURES_SUPPORTED png_uint_32 PNGAPI -png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features) +png_permit_mng_features (png_structrp png_ptr, png_uint_32 mng_features) { png_debug(1, "in png_permit_mng_features"); if (png_ptr == NULL) - return (png_uint_32)0; + return 0; - png_ptr->mng_features_permitted = - (png_byte)(mng_features & PNG_ALL_MNG_FEATURES); + png_ptr->mng_features_permitted = mng_features & PNG_ALL_MNG_FEATURES; - return (png_uint_32)png_ptr->mng_features_permitted; + return png_ptr->mng_features_permitted; } #endif #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED +static unsigned int +add_one_chunk(png_bytep list, unsigned int count, png_const_bytep add, int keep) +{ + unsigned int i; + + /* Utility function: update the 'keep' state of a chunk if it is already in + * the list, otherwise add it to the list. + */ + for (i=0; i= PNG_HANDLE_CHUNK_LAST) { - if (keep == PNG_HANDLE_CHUNK_ALWAYS || keep == PNG_HANDLE_CHUNK_IF_SAFE) - png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS; + png_app_error(png_ptr, "png_set_keep_unknown_chunks: invalid keep"); + return; + } - else - png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS; + if (num_chunks_in <= 0) + { + png_ptr->unknown_default = keep; - if (keep == PNG_HANDLE_CHUNK_ALWAYS) - png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS; + /* '0' means just set the flags, so stop here */ + if (num_chunks_in == 0) + return; + } - else - png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS; + if (num_chunks_in < 0) + { + /* Ignore all unknown chunks and all chunks recognized by + * libpng except for IHDR, PLTE, tRNS, IDAT, and IEND + */ + static PNG_CONST png_byte chunks_to_ignore[] = { + 98, 75, 71, 68, '\0', /* bKGD */ + 99, 72, 82, 77, '\0', /* cHRM */ + 103, 65, 77, 65, '\0', /* gAMA */ + 104, 73, 83, 84, '\0', /* hIST */ + 105, 67, 67, 80, '\0', /* iCCP */ + 105, 84, 88, 116, '\0', /* iTXt */ + 111, 70, 70, 115, '\0', /* oFFs */ + 112, 67, 65, 76, '\0', /* pCAL */ + 112, 72, 89, 115, '\0', /* pHYs */ + 115, 66, 73, 84, '\0', /* sBIT */ + 115, 67, 65, 76, '\0', /* sCAL */ + 115, 80, 76, 84, '\0', /* sPLT */ + 115, 84, 69, 82, '\0', /* sTER */ + 115, 82, 71, 66, '\0', /* sRGB */ + 116, 69, 88, 116, '\0', /* tEXt */ + 116, 73, 77, 69, '\0', /* tIME */ + 122, 84, 88, 116, '\0' /* zTXt */ + }; - return; + chunk_list = chunks_to_ignore; + num_chunks = (sizeof chunks_to_ignore)/5; } + else /* num_chunks_in > 0 */ + { if (chunk_list == NULL) + { + /* Prior to 1.6.0 this was silently ignored, now it is an app_error + * which can be switched off. + */ + png_app_error(png_ptr, "png_set_keep_unknown_chunks: no chunk list"); return; + } + + num_chunks = num_chunks_in; + } old_num_chunks = png_ptr->num_chunk_list; - new_list=(png_bytep)png_malloc(png_ptr, - (png_size_t)(5*(num_chunks + old_num_chunks))); + if (png_ptr->chunk_list == NULL) + old_num_chunks = 0; - if (png_ptr->chunk_list != NULL) + /* Since num_chunks is always restricted to UINT_MAX/5 this can't overflow. + */ + if (num_chunks + old_num_chunks > UINT_MAX/5) { - png_memcpy(new_list, png_ptr->chunk_list, - (png_size_t)(5*old_num_chunks)); - png_free(png_ptr, png_ptr->chunk_list); - png_ptr->chunk_list=NULL; + png_app_error(png_ptr, "png_set_keep_unknown_chunks: too many chunks"); + return; + } + + /* If these chunks are being reset to the default then no more memory is + * required because add_one_chunk above doesn't extend the list if the 'keep' + * parameter is the default. + */ + if (keep) + { + new_list = png_voidcast(png_bytep, png_malloc(png_ptr, + 5 * (num_chunks + old_num_chunks))); + + if (old_num_chunks > 0) + memcpy(new_list, png_ptr->chunk_list, 5*old_num_chunks); + } + + else if (old_num_chunks > 0) + new_list = png_ptr->chunk_list; + + else + new_list = NULL; + + /* Add the new chunks together with each one's handling code. If the chunk + * already exists the code is updated, otherwise the chunk is added to the + * end. (In libpng 1.6.0 order no longer matters because this code enforces + * the earlier convention that the last setting is the one that is used.) + */ + if (new_list != NULL) + { + png_const_bytep inlist; + png_bytep outlist; + unsigned int i; + + for (i=0; ichunk_list != new_list) + png_free(png_ptr, new_list); + + new_list = NULL; + } } - png_memcpy(new_list + 5*old_num_chunks, chunk_list, - (png_size_t)(5*num_chunks)); + else + num_chunks = 0; - for (p = new_list + 5*old_num_chunks + 4, i = 0; inum_chunk_list = num_chunks; + + if (png_ptr->chunk_list != new_list) + { + if (png_ptr->chunk_list != NULL) + png_free(png_ptr, png_ptr->chunk_list); - png_ptr->num_chunk_list = old_num_chunks + num_chunks; png_ptr->chunk_list = new_list; - png_ptr->free_me |= PNG_FREE_LIST; + } } #endif #ifdef PNG_READ_USER_CHUNKS_SUPPORTED void PNGAPI -png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr, +png_set_read_user_chunk_fn(png_structrp png_ptr, png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn) { png_debug(1, "in png_set_read_user_chunk_fn"); @@ -1185,9 +1397,10 @@ #endif #ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI -png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers) +png_set_rows(png_const_structrp png_ptr, png_inforp info_ptr, + png_bytepp row_pointers) { png_debug1(1, "in %s storage function", "rows"); if (png_ptr == NULL || info_ptr == NULL) @@ -1203,37 +1416,62 @@ } #endif void PNGAPI -png_set_compression_buffer_size(png_structp png_ptr, png_size_t size) +png_set_compression_buffer_size(png_structrp png_ptr, png_size_t size) { if (png_ptr == NULL) return; - png_free(png_ptr, png_ptr->zbuf); + if (size == 0 || size > PNG_UINT_31_MAX) + png_error(png_ptr, "invalid compression buffer size"); - if (size > ZLIB_IO_MAX) +# ifdef PNG_SEQUENTIAL_READ_SUPPORTED + if (png_ptr->mode & PNG_IS_READ_STRUCT) { - png_warning(png_ptr, "Attempt to set buffer size beyond max ignored"); - png_ptr->zbuf_size = ZLIB_IO_MAX; - size = ZLIB_IO_MAX; /* must fit */ + png_ptr->IDAT_read_size = (png_uint_32)size; /* checked above */ + return; } +# endif - else - png_ptr->zbuf_size = (uInt)size; +# ifdef PNG_WRITE_SUPPORTED + if (!(png_ptr->mode & PNG_IS_READ_STRUCT)) + { + if (png_ptr->zowner != 0) + { + png_warning(png_ptr, + "Compression buffer size cannot be changed because it is in use"); + return; + } - png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size); + if (size > ZLIB_IO_MAX) + { + png_warning(png_ptr, + "Compression buffer size limited to system maximum"); + size = ZLIB_IO_MAX; /* must fit */ + } - /* The following ensures a relatively safe failure if this gets called while - * the buffer is actually in use. + else if (size < 6) + { + /* Deflate will potentially go into an infinite loop on a SYNC_FLUSH + * if this is permitted. */ - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = 0; - png_ptr->zstream.avail_in = 0; + png_warning(png_ptr, + "Compression buffer size cannot be reduced below 6"); + return; + } + + if (png_ptr->zbuffer_size != size) + { + png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); + png_ptr->zbuffer_size = (uInt)size; + } + } +# endif } void PNGAPI -png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask) +png_set_invalid(png_const_structrp png_ptr, png_inforp info_ptr, int mask) { if (png_ptr && info_ptr) info_ptr->valid &= ~mask; } @@ -1238,13 +1476,12 @@ info_ptr->valid &= ~mask; } - #ifdef PNG_SET_USER_LIMITS_SUPPORTED /* This function was added to libpng 1.2.6 */ void PNGAPI -png_set_user_limits (png_structp png_ptr, png_uint_32 user_width_max, +png_set_user_limits (png_structrp png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max) { /* Images with dimensions larger than these limits will be * rejected by png_set_IHDR(). To accept any PNG datastream @@ -1258,18 +1495,17 @@ } /* This function was added to libpng 1.4.0 */ void PNGAPI -png_set_chunk_cache_max (png_structp png_ptr, - png_uint_32 user_chunk_cache_max) +png_set_chunk_cache_max (png_structrp png_ptr, png_uint_32 user_chunk_cache_max) { if (png_ptr) png_ptr->user_chunk_cache_max = user_chunk_cache_max; } /* This function was added to libpng 1.4.1 */ void PNGAPI -png_set_chunk_malloc_max (png_structp png_ptr, +png_set_chunk_malloc_max (png_structrp png_ptr, png_alloc_size_t user_chunk_malloc_max) { if (png_ptr) png_ptr->user_chunk_malloc_max = user_chunk_malloc_max; @@ -1278,30 +1514,43 @@ #ifdef PNG_BENIGN_ERRORS_SUPPORTED void PNGAPI -png_set_benign_errors(png_structp png_ptr, int allowed) +png_set_benign_errors(png_structrp png_ptr, int allowed) { png_debug(1, "in png_set_benign_errors"); + /* If allowed is 1, png_benign_error() is treated as a warning. + * + * If allowed is 0, png_benign_error() is treated as an error (which + * is the default behavior if png_set_benign_errors() is not called). + */ + if (allowed) - png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN; + png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN | + PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN; else - png_ptr->flags &= ~PNG_FLAG_BENIGN_ERRORS_WARN; + png_ptr->flags &= ~(PNG_FLAG_BENIGN_ERRORS_WARN | + PNG_FLAG_APP_WARNINGS_WARN | PNG_FLAG_APP_ERRORS_WARN); } #endif /* PNG_BENIGN_ERRORS_SUPPORTED */ #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED -/* Whether to report invalid palette index; added at libng-1.5.10 - * allowed - one of 0: disable; 1: enable + /* Whether to report invalid palette index; added at libng-1.5.10. + * It is possible for an indexed (color-type==3) PNG file to contain + * pixels with invalid (out-of-range) indexes if the PLTE chunk has + * fewer entries than the image's bit-depth would allow. We recover + * from this gracefully by filling any incomplete palette with zeroes + * (opaque black). By default, when this occurs libpng will issue + * a benign error. This API can be used to override that behavior. */ void PNGAPI -png_set_check_for_invalid_index(png_structp png_ptr, int allowed) +png_set_check_for_invalid_index(png_structrp png_ptr, int allowed) { png_debug(1, "in png_set_check_for_invalid_index"); - if (allowed) + if (allowed > 0) png_ptr->num_palette_max = 0; else png_ptr->num_palette_max = -1; diff -ru4NwbB libpng-1.5.13/pngstruct.h libpng-1.6.0beta32/pngstruct.h --- libpng-1.5.13/pngstruct.h 2012-09-27 06:21:19.633638126 -0500 +++ libpng-1.6.0beta32/pngstruct.h 2012-11-25 12:40:10.006593884 -0600 @@ -4,9 +4,9 @@ * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * - * Last changed in libpng 1.5.9 [February 18, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * * This code is released under the libpng license. * For conditions of distribution and use, see the disclaimer * and license in png.h @@ -23,15 +23,132 @@ /* zlib.h defines the structure z_stream, an instance of which is included * in this structure and is required for decompressing the LZ compressed * data in PNG files. */ +#ifndef ZLIB_CONST + /* We must ensure that zlib uses 'const' in declarations. */ +# define ZLIB_CONST +#endif #include "zlib.h" +#ifdef const + /* zlib.h sometimes #defines const to nothing, undo this. */ +# undef const +#endif + +/* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility + * with older builds. + */ +#if ZLIB_VERNUM < 0x1260 +# define PNGZ_MSG_CAST(s) png_constcast(char*,s) +# define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b) +#else +# define PNGZ_MSG_CAST(s) (s) +# define PNGZ_INPUT_CAST(b) (b) +#endif + +/* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib + * can handle at once. This type need be no larger than 16 bits (so maximum of + * 65535), this define allows us to discover how big it is, but limited by the + * maximuum for png_size_t. The value can be overriden in a library build + * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably + * lower value (e.g. 255 works). A lower value may help memory usage (slightly) + * and may even improve performance on some systems (and degrade it on others.) + */ +#ifndef ZLIB_IO_MAX +# define ZLIB_IO_MAX ((uInt)-1) +#endif + +#ifdef PNG_WRITE_SUPPORTED +/* The type of a compression buffer list used by the write code. */ +typedef struct png_compression_buffer +{ + struct png_compression_buffer *next; + png_byte output[1]; /* actually zbuf_size */ +} png_compression_buffer, *png_compression_bufferp; + +#define PNG_COMPRESSION_BUFFER_SIZE(pp)\ + (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size) +#endif + +/* Colorspace support; structures used in png_struct, png_info and in internal + * functions to hold and communicate information about the color space. + * + * PNG_COLORSPACE_SUPPORTED is only required if the application will perform + * colorspace corrections, otherwise all the colorspace information can be + * skipped and the size of libpng can be reduced (significantly) by compiling + * out the colorspace support. + */ +#ifdef PNG_COLORSPACE_SUPPORTED +/* The chromaticities of the red, green and blue colorants and the chromaticity + * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)). + */ +typedef struct png_xy +{ + png_fixed_point redx, redy; + png_fixed_point greenx, greeny; + png_fixed_point bluex, bluey; + png_fixed_point whitex, whitey; +} png_xy; + +/* The same data as above but encoded as CIE XYZ values. When this data comes + * from chromaticities the sum of the Y values is assumed to be 1.0 + */ +typedef struct png_XYZ +{ + png_fixed_point red_X, red_Y, red_Z; + png_fixed_point green_X, green_Y, green_Z; + png_fixed_point blue_X, blue_Y, blue_Z; +} png_XYZ; +#endif /* COLORSPACE */ + +#if defined PNG_COLORSPACE_SUPPORTED || defined PNG_GAMMA_SUPPORTED +/* A colorspace is all the above plus, potentially, profile information, + * however at present libpng does not use the profile internally so it is only + * stored in the png_info struct (if iCCP is supported.) The rendering intent + * is retained here and is checked. + * + * The file gamma encoding information is also stored here and gamma correction + * is done by libpng, whereas color correction must currently be done by the + * application. + */ +typedef struct png_colorspace +{ +#ifdef PNG_GAMMA_SUPPORTED + png_fixed_point gamma; /* File gamma */ +#endif + +#ifdef PNG_COLORSPACE_SUPPORTED + png_xy end_points_xy; /* End points as chromaticities */ + png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */ + png_uint_16 rendering_intent; /* Rendering intent of a profile */ +#endif + + /* Flags are always defined to simplify the code. */ + png_uint_16 flags; /* As defined below */ +} png_colorspace, * PNG_RESTRICT png_colorspacerp; + +typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp; + +/* General flags for the 'flags' field */ +#define PNG_COLORSPACE_HAVE_GAMMA 0x0001 +#define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002 +#define PNG_COLORSPACE_HAVE_INTENT 0x0004 +#define PNG_COLORSPACE_FROM_gAMA 0x0008 +#define PNG_COLORSPACE_FROM_cHRM 0x0010 +#define PNG_COLORSPACE_FROM_sRGB 0x0020 +#define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040 +#define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */ +#define PNG_COLORSPACE_INVALID 0x8000 +#define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags)) +#endif /* COLORSPACE || GAMMA */ struct png_struct_def { #ifdef PNG_SETJMP_SUPPORTED - jmp_buf longjmp_buffer; /* used in png_error */ + jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */ png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ + jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */ + size_t jmp_buf_size; /* size of the above, if allocated */ #endif png_error_ptr error_fn; /* function for printing errors and aborting */ #ifdef PNG_WARNINGS_SUPPORTED png_error_ptr warning_fn; /* function for printing warnings */ @@ -62,41 +179,38 @@ png_uint_32 mode; /* tells us where we are in the PNG file */ png_uint_32 flags; /* flags indicating various things to libpng */ png_uint_32 transformations; /* which transformations to perform */ - z_stream zstream; /* pointer to decompression structure (below) */ - png_bytep zbuf; /* buffer for zlib */ - uInt zbuf_size; /* size of zbuf (typically 65536) */ -#ifdef PNG_WRITE_SUPPORTED - -/* Added in 1.5.4: state to keep track of whether the zstream has been - * initialized and if so whether it is for IDAT or some other chunk. - */ -#define PNG_ZLIB_UNINITIALIZED 0 -#define PNG_ZLIB_FOR_IDAT 1 -#define PNG_ZLIB_FOR_TEXT 2 /* anything other than IDAT */ -#define PNG_ZLIB_USE_MASK 3 /* bottom two bits */ -#define PNG_ZLIB_IN_USE 4 /* a flag value */ + png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */ + z_stream zstream; /* decompression structure */ - png_uint_32 zlib_state; /* State of zlib initialization */ -/* End of material added at libpng 1.5.4 */ +#ifdef PNG_WRITE_SUPPORTED + png_compression_bufferp zbuffer_list; /* Created on demand during write */ + uInt zbuffer_size; /* size of the actual buffer */ int zlib_level; /* holds zlib compression level */ int zlib_method; /* holds zlib compression method */ int zlib_window_bits; /* holds zlib compression window bits */ int zlib_mem_level; /* holds zlib compression memory level */ int zlib_strategy; /* holds zlib compression strategy */ #endif /* Added at libpng 1.5.4 */ -#if defined(PNG_WRITE_COMPRESSED_TEXT_SUPPORTED) || \ - defined(PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED) +#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED int zlib_text_level; /* holds zlib compression level */ int zlib_text_method; /* holds zlib compression method */ int zlib_text_window_bits; /* holds zlib compression window bits */ int zlib_text_mem_level; /* holds zlib compression memory level */ int zlib_text_strategy; /* holds zlib compression strategy */ #endif /* End of material added at libpng 1.5.4 */ +/* Added at libpng 1.6.0 */ +#ifdef PNG_WRITE_SUPPORTED + int zlib_set_level; /* Actual values set into the zstream on write */ + int zlib_set_method; + int zlib_set_window_bits; + int zlib_set_mem_level; + int zlib_set_strategy; +#endif png_uint_32 width; /* width of image in pixels */ png_uint_32 height; /* height of image in pixels */ png_uint_32 num_rows; /* number of rows in current pass */ @@ -110,12 +224,14 @@ */ png_bytep row_buf; /* buffer to save current (unfiltered) row. * This is a pointer into big_row_buf */ +#ifdef PNG_WRITE_SUPPORTED png_bytep sub_row; /* buffer to save "sub" row when filtering */ png_bytep up_row; /* buffer to save "up" row when filtering */ png_bytep avg_row; /* buffer to save "avg" row when filtering */ png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ +#endif png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */ png_uint_32 idat_size; /* current IDAT size for read */ png_uint_32 crc; /* current chunk CRC value */ @@ -137,17 +253,16 @@ png_byte bit_depth; /* bit depth of file */ png_byte usr_bit_depth; /* bit depth of users row: write only */ png_byte pixel_depth; /* number of bits per pixel */ png_byte channels; /* number of channels in file */ +#ifdef PNG_WRITE_SUPPORTED png_byte usr_channels; /* channels at start of write: write only */ +#endif png_byte sig_bytes; /* magic bytes read/written from start of file */ png_byte maximum_pixel_depth; /* pixel depth used for the row buffers */ png_byte transformed_pixel_depth; /* pixel depth after read/write transforms */ - png_byte io_chunk_string[5]; - /* string name of chunk */ - #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) png_uint_16 filler; /* filler bytes for pixel expansion */ #endif @@ -168,9 +283,8 @@ #endif #ifdef PNG_READ_GAMMA_SUPPORTED int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ - png_fixed_point gamma; /* file gamma value */ png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ png_bytep gamma_table; /* gamma table for 8-bit depth files */ png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ @@ -232,12 +346,8 @@ png_bytep palette_lookup; /* lookup table for quantizing */ png_bytep quantize_index; /* index translation for palette files */ #endif -#if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED) - png_uint_16p hist; /* histogram */ -#endif - #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED png_byte heuristic_method; /* heuristic for row filter selection */ png_byte num_prev_filters; /* number of weights for previous rows */ png_bytep prev_filters; /* filter type(s) of previous row(s) */ @@ -246,30 +356,31 @@ png_uint_16p filter_costs; /* relative filter calculation cost */ png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ #endif +#if PNG_LIBPNG_VER < 10700 +/* To do: remove this from libpng-1.7 */ #ifdef PNG_TIME_RFC1123_SUPPORTED - /* This is going to be unused in libpng16 and removed from libpng17 */ char time_buffer[29]; /* String to hold RFC 1123 time text */ #endif +#endif /* New members added in libpng-1.0.6 */ png_uint_32 free_me; /* flags items libpng is responsible for freeing */ #ifdef PNG_USER_CHUNKS_SUPPORTED png_voidp user_chunk_ptr; +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ #endif - -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - int num_chunk_list; - png_bytep chunk_list; #endif -#ifdef PNG_READ_sRGB_SUPPORTED - /* Added in 1.5.5 to record an sRGB chunk in the png. */ - png_byte is_sRGB; +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + int unknown_default; /* As PNG_HANDLE_* */ + unsigned int num_chunk_list; /* Number of entries in the list */ + png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name + * followed by a PNG_HANDLE_* byte */ #endif /* New members added in libpng-1.0.3 */ #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED @@ -332,18 +443,26 @@ png_alloc_size_t user_chunk_malloc_max; #endif /* New member added in libpng-1.0.25 and 1.2.17 */ -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED - /* Storage for unknown chunk that the library doesn't recognize. */ +#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED + /* Temporary storage for unknown chunk that the library doesn't recognize, + * used while reading the chunk. + */ png_unknown_chunk unknown_chunk; #endif /* New member added in libpng-1.2.26 */ png_size_t old_big_row_buf_size; +#ifdef PNG_READ_SUPPORTED /* New member added in libpng-1.2.30 */ - png_charp chunkdata; /* buffer for reading chunk data */ + png_bytep read_buffer; /* buffer for reading chunk data */ + png_alloc_size_t read_buffer_size; /* current size of the buffer */ +#endif +#ifdef PNG_SEQUENTIAL_READ_SUPPORTED + uInt IDAT_read_size; /* limit on read buffer size for IDAT */ +#endif #ifdef PNG_IO_STATE_SUPPORTED /* New member added in libpng-1.4.0 */ png_uint_32 io_state; @@ -353,6 +472,12 @@ png_bytep big_prev_row; void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info, png_bytep row, png_const_bytep prev_row); + +#ifdef PNG_READ_SUPPORTED +#if defined PNG_COLORSPACE_SUPPORTED || defined PNG_GAMMA_SUPPORTED + png_colorspace colorspace; +#endif +#endif }; #endif /* PNGSTRUCT_H */ diff -ru4NwbB libpng-1.5.13/pngtest.c libpng-1.6.0beta32/pngtest.c --- libpng-1.5.13/pngtest.c 2012-09-27 06:21:19.773526699 -0500 +++ libpng-1.6.0beta32/pngtest.c 2012-11-25 12:40:10.151934059 -0600 @@ -1,9 +1,9 @@ /* pngtest.c - a simple test program to test libpng * - * Last changed in libpng 1.5.6 [November 3, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This code is released under the libpng license. @@ -32,17 +32,24 @@ */ #define _POSIX_SOURCE 1 -#include "zlib.h" +#include +#include +#include + +/* Defined so I can write to a file on gui/windowing platforms */ +/* #define STDERR stderr */ +#define STDERR stdout /* For DOS */ + #include "png.h" + +#ifdef PNG_READ_SUPPORTED /* else nothing can be done */ +#include "zlib.h" /* Copied from pngpriv.h but only used in error messages below. */ #ifndef PNG_ZBUF_SIZE # define PNG_ZBUF_SIZE 8192 #endif -# include -# include -# include # define FCLOSE(file) fclose(file) #ifndef PNG_STDIO_SUPPORTED typedef FILE * png_FILE_p; @@ -66,19 +73,8 @@ #if !PNG_DEBUG # define SINGLE_ROWBUF_ALLOC /* Makes buffer overruns easier to nail */ #endif -/* The code uses memcmp and memcpy on large objects (typically row pointers) so - * it is necessary to do soemthing special on certain architectures, note that - * the actual support for this was effectively removed in 1.4, so only the - * memory remains in this program: - */ -#define CVT_PTR(ptr) (ptr) -#define CVT_PTR_NOCHECK(ptr) (ptr) -#define png_memcmp memcmp -#define png_memcpy memcpy -#define png_memset memset - /* Turn on CPU timing #define PNGTEST_TIMING */ @@ -98,32 +94,39 @@ #endif static int verbose = 0; static int strict = 0; - -int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname)); +static int relaxed = 0; +static int unsupported_chunks = 0; /* chunk unsupported by libpng in input */ +static int error_count = 0; /* count calls to png_error */ +static int warning_count = 0; /* count calls to png_warning */ #ifdef __TURBOC__ #include #endif -/* Defined so I can write to a file on gui/windowing platforms */ -/* #define STDERR stderr */ -#define STDERR stdout /* For DOS */ - /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */ #ifndef png_jmpbuf # define png_jmpbuf(png_ptr) png_ptr->jmpbuf #endif +/* Defines for unknown chunk handling if required. */ +#ifndef PNG_HANDLE_CHUNK_ALWAYS +# define PNG_HANDLE_CHUNK_ALWAYS 3 +#endif +#ifndef PNG_HANDLE_CHUNK_IF_SAFE +# define PNG_HANDLE_CHUNK_IF_SAFE 2 +#endif + +/* Utility to save typing/errors, the argument must be a name */ +#define MEMZERO(var) ((void)memset(&var, 0, sizeof var)) + /* Example of using row callbacks to make a simple progress meter */ static int status_pass = 1; static int status_dots_requested = 0; static int status_dots = 1; -void PNGCBAPI -read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass); -void PNGCBAPI +static void PNGCBAPI read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass) { if (png_ptr == NULL || row_number > PNG_UINT_31_MAX) return; @@ -145,29 +148,27 @@ fprintf(stdout, "r"); } -void PNGCBAPI -write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass); -void PNGCBAPI +#ifdef PNG_WRITE_SUPPORTED +static void PNGCBAPI write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass) { if (png_ptr == NULL || row_number > PNG_UINT_31_MAX || pass > 7) return; fprintf(stdout, "w"); } +#endif #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED /* Example of using user transform callback (we don't transform anything, * but merely examine the row filters. We set this to 256 rather than * 5 in case illegal filter values are present.) */ static png_uint_32 filters_used[256]; -void PNGCBAPI -count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data); -void PNGCBAPI +static void PNGCBAPI count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data) { if (png_ptr != NULL && row_info != NULL) ++filters_used[*(data - 1)]; @@ -180,11 +181,9 @@ */ static png_uint_32 zero_samples; -void PNGCBAPI -count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data); -void PNGCBAPI +static void PNGCBAPI count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data) { png_bytep dp = data; if (png_ptr == NULL) @@ -289,10 +288,8 @@ } } #endif /* PNG_WRITE_USER_TRANSFORM_SUPPORTED */ -static int wrote_question = 0; - #ifndef PNG_STDIO_SUPPORTED /* START of code to validate stdio-free compilation */ /* These copies of the default read/write functions come from pngrio.c and * pngwio.c. They allow "don't include stdio" testing of the library. @@ -343,9 +340,8 @@ png_error(png_ptr, "Bad I/O state or buffer size"); } #endif -#ifndef USE_FAR_KEYWORD static void PNGCBAPI pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check = 0; @@ -368,61 +364,8 @@ #ifdef PNG_IO_STATE_SUPPORTED pngtest_check_io_state(png_ptr, length, PNG_IO_READING); #endif } -#else -/* This is the model-independent version. Since the standard I/O library - can't handle far buffers in the medium and small models, we have to copy - the data. -*/ - -#define NEAR_BUF_SIZE 1024 -#define MIN(a,b) (a <= b ? a : b) - -static void PNGCBAPI -pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length) -{ - png_size_t check; - png_byte *n_data; - png_FILE_p io_ptr; - - /* Check if data really is near. If so, use usual code. */ - n_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (png_FILE_p)CVT_PTR(png_get_io_ptr(png_ptr)); - if ((png_bytep)n_data == data) - { - check = fread(n_data, 1, length, io_ptr); - } - else - { - png_byte buf[NEAR_BUF_SIZE]; - png_size_t read, remaining, err; - check = 0; - remaining = length; - - do - { - read = MIN(NEAR_BUF_SIZE, remaining); - err = fread(buf, 1, 1, io_ptr); - png_memcpy(data, buf, read); /* Copy far buffer to near buffer */ - if (err != read) - break; - else - check += err; - data += read; - remaining -= read; - } - while (remaining != 0); - } - - if (check != length) - png_error(png_ptr, "Read Error"); - -#ifdef PNG_IO_STATE_SUPPORTED - pngtest_check_io_state(png_ptr, length, PNG_IO_READING); -#endif -} -#endif /* USE_FAR_KEYWORD */ #ifdef PNG_WRITE_FLUSH_SUPPORTED static void PNGCBAPI pngtest_flush(png_structp png_ptr) @@ -436,9 +379,8 @@ * not writing to a standard C stream, you should create a replacement * write_data function and use it at run time with png_set_write_fn(), rather * than changing the library. */ -#ifndef USE_FAR_KEYWORD static void PNGCBAPI pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check; @@ -453,83 +395,33 @@ #ifdef PNG_IO_STATE_SUPPORTED pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING); #endif } -#else -/* This is the model-independent version. Since the standard I/O library - can't handle far buffers in the medium and small models, we have to copy - the data. -*/ - -#define NEAR_BUF_SIZE 1024 -#define MIN(a,b) (a <= b ? a : b) - -static void PNGCBAPI -pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length) -{ - png_size_t check; - png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */ - png_FILE_p io_ptr; - - /* Check if data really is near. If so, use usual code. */ - near_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (png_FILE_p)CVT_PTR(png_get_io_ptr(png_ptr)); - - if ((png_bytep)near_data == data) - { - check = fwrite(near_data, 1, length, io_ptr); - } - - else - { - png_byte buf[NEAR_BUF_SIZE]; - png_size_t written, remaining, err; - check = 0; - remaining = length; - - do - { - written = MIN(NEAR_BUF_SIZE, remaining); - png_memcpy(buf, data, written); /* Copy far buffer to near buffer */ - err = fwrite(buf, 1, written, io_ptr); - if (err != written) - break; - else - check += err; - data += written; - remaining -= written; - } - while (remaining != 0); - } - - if (check != length) - { - png_error(png_ptr, "Write Error"); - } - -#ifdef PNG_IO_STATE_SUPPORTED - pngtest_check_io_state(png_ptr, length, PNG_IO_WRITING); -#endif -} -#endif /* USE_FAR_KEYWORD */ +#endif /* !PNG_STDIO_SUPPORTED */ /* This function is called when there is a warning, but the library thinks * it can continue anyway. Replacement functions don't have to do anything * here if you don't want to. In the default configuration, png_ptr is * not used, but it is passed in case it may be useful. */ +typedef struct +{ + PNG_CONST char *file_name; +} pngtest_error_parameters; + static void PNGCBAPI pngtest_warning(png_structp png_ptr, png_const_charp message) { PNG_CONST char *name = "UNKNOWN (ERROR!)"; - char *test; - test = png_get_error_ptr(png_ptr); + pngtest_error_parameters *test = + (pngtest_error_parameters*)png_get_error_ptr(png_ptr); - if (test == NULL) - fprintf(STDERR, "%s: libpng warning: %s\n", name, message); + ++warning_count; - else - fprintf(STDERR, "%s: libpng warning: %s\n", test, message); + if (test != NULL && test->file_name != NULL) + name = test->file_name; + + fprintf(STDERR, "%s: libpng warning: %s\n", name, message); } /* This is the default error handling function. Note that replacements for * this function MUST NOT RETURN, or the program will likely crash. This @@ -538,14 +430,16 @@ */ static void PNGCBAPI pngtest_error(png_structp png_ptr, png_const_charp message) { + ++error_count; + pngtest_warning(png_ptr, message); /* We can return because png_error calls the default handler, which is * actually OK in this case. */ } -#endif /* !PNG_STDIO_SUPPORTED */ + /* END of code to validate stdio-free compilation */ /* START of code to validate memory allocation and deallocation */ #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG @@ -562,11 +456,11 @@ typedef struct memory_information { png_alloc_size_t size; png_voidp pointer; - struct memory_information FAR *next; + struct memory_information *next; } memory_information; -typedef memory_information FAR *memory_infop; +typedef memory_information *memory_infop; static memory_infop pinformation = NULL; static int current_allocation = 0; static int maximum_allocation = 0; @@ -594,9 +488,9 @@ /* Disable malloc_fn and free_fn */ memory_infop pinfo; png_set_mem_fn(png_ptr, NULL, NULL, NULL); pinfo = (memory_infop)png_malloc(png_ptr, - png_sizeof(*pinfo)); + (sizeof *pinfo)); pinfo->size = size; current_allocation += size; total_allocation += size; num_allocations ++; @@ -620,9 +514,9 @@ pinfo->next = pinformation; pinformation = pinfo; /* Make sure the caller isn't assuming zeroed memory. */ - png_memset(pinfo->pointer, 0xdd, pinfo->size); + memset(pinfo->pointer, 0xdd, pinfo->size); if (verbose) printf("png_malloc %lu bytes at %p\n", (unsigned long)size, pinfo->pointer); @@ -647,9 +541,9 @@ } /* Unlink the element from the list. */ { - memory_infop FAR *ppinfo = &pinformation; + memory_infop *ppinfo = &pinformation; for (;;) { memory_infop pinfo = *ppinfo; @@ -661,9 +555,9 @@ if (current_allocation < 0) fprintf(STDERR, "Duplicate free of memory\n"); /* We must free the list element too, but first kill the memory that is to be freed. */ - png_memset(ptr, 0x55, pinfo->size); + memset(ptr, 0x55, pinfo->size); png_free_default(png_ptr, pinfo); pinfo = NULL; break; } @@ -688,27 +582,75 @@ #endif /* PNG_USER_MEM_SUPPORTED && PNG_DEBUG */ /* END of code to test memory allocation/deallocation */ +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED /* Demonstration of user chunk support of the sTER and vpAg chunks */ -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED /* (sTER is a public chunk not yet known by libpng. vpAg is a private chunk used in ImageMagick to store "virtual page" size). */ -static png_uint_32 user_chunk_data[4]; +static struct user_chunk_data +{ + png_const_infop info_ptr; + png_uint_32 vpAg_width, vpAg_height; + png_byte vpAg_units; + png_byte sTER_mode; + int location[2]; +} +user_chunk_data; + +/* Used for location and order; zero means nothing. */ +#define have_sTER 0x01 +#define have_vpAg 0x02 +#define before_PLTE 0x10 +#define before_IDAT 0x20 +#define after_IDAT 0x40 + +static void +init_callback_info(png_const_infop info_ptr) +{ + MEMZERO(user_chunk_data); + user_chunk_data.info_ptr = info_ptr; +} + +static int +set_location(png_structp png_ptr, struct user_chunk_data *data, int what) +{ + int location; + + if ((data->location[0] & what) || (data->location[1] & what)) + return 0; /* already have one of these */ - /* 0: sTER mode + 1 - * 1: vpAg width - * 2: vpAg height - * 3: vpAg units + /* Find where we are (the code below zeros info_ptr to indicate that the + * chunks before the first IDAT have been read.) */ + if (data->info_ptr == NULL) /* after IDAT */ + location = what | after_IDAT; + + else if (png_get_valid(png_ptr, data->info_ptr, PNG_INFO_PLTE)) + location = what | before_IDAT; + + else + location = what | before_PLTE; + + if (data->location[0] == 0) + data->location[0] = location; + + else + data->location[1] = location; + + return 1; /* handled */ +} static int PNGCBAPI read_user_chunk_callback(png_struct *png_ptr, png_unknown_chunkp chunk) { - png_uint_32 - *my_user_chunk_data; + struct user_chunk_data *my_user_chunk_data = + (struct user_chunk_data*)png_get_user_chunk_ptr(png_ptr); + + if (my_user_chunk_data == NULL) + png_error(png_ptr, "lost user chunk pointer"); /* Return one of the following: * return (-n); chunk had an error * return (0); did not recognize @@ -731,13 +673,18 @@ if (chunk->data[0] != 0 && chunk->data[0] != 1) return (-1); /* Invalid mode */ - my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr); - my_user_chunk_data[0]=chunk->data[0]+1; + if (set_location(png_ptr, my_user_chunk_data, have_sTER)) + { + my_user_chunk_data->sTER_mode=chunk->data[0]; return (1); } + else + return (0); /* duplicate sTER - give it to libpng */ + } + if (chunk->name[0] != 118 || chunk->name[1] != 112 || /* v p */ chunk->name[2] != 65 || chunk->name[3] != 103) /* A g */ return (0); /* Did not recognize */ @@ -745,26 +692,121 @@ if (chunk->size != 9) return (-1); /* Error return */ - my_user_chunk_data=(png_uint_32 *) png_get_user_chunk_ptr(png_ptr); + if (!set_location(png_ptr, my_user_chunk_data, have_vpAg)) + return (0); /* duplicate vpAg */ - my_user_chunk_data[1]=png_get_uint_31(png_ptr, chunk->data); - my_user_chunk_data[2]=png_get_uint_31(png_ptr, chunk->data + 4); - my_user_chunk_data[3]=(png_uint_32)chunk->data[8]; + my_user_chunk_data->vpAg_width = png_get_uint_31(png_ptr, chunk->data); + my_user_chunk_data->vpAg_height = png_get_uint_31(png_ptr, chunk->data + 4); + my_user_chunk_data->vpAg_units = chunk->data[8]; return (1); +} +#ifdef PNG_WRITE_SUPPORTED +static void +write_sTER_chunk(png_structp write_ptr) +{ + png_byte png_sTER[5] = {115, 84, 69, 82, '\0'}; + + if (verbose) + fprintf(STDERR, "\n stereo mode = %d\n", user_chunk_data.sTER_mode); + + png_write_chunk(write_ptr, png_sTER, &user_chunk_data.sTER_mode, 1); } + +static void +write_vpAg_chunk(png_structp write_ptr) +{ + png_byte png_vpAg[5] = {118, 112, 65, 103, '\0'}; + + png_byte vpag_chunk_data[9]; + + if (verbose) + fprintf(STDERR, " vpAg = %lu x %lu, units = %d\n", + (unsigned long)user_chunk_data.vpAg_width, + (unsigned long)user_chunk_data.vpAg_height, + user_chunk_data.vpAg_units); + + png_save_uint_32(vpag_chunk_data, user_chunk_data.vpAg_width); + png_save_uint_32(vpag_chunk_data + 4, user_chunk_data.vpAg_height); + vpag_chunk_data[8] = user_chunk_data.vpAg_units; + png_write_chunk(write_ptr, png_vpAg, vpag_chunk_data, 9); +} + +static void +write_chunks(png_structp write_ptr, int location) +{ + int i; + + /* Notice that this preserves the original chunk order, however chunks + * intercepted by the callback will be written *after* chunks passed to + * libpng. This will actually reverse a pair of sTER chunks or a pair of + * vpAg chunks, resulting in an error later. This is not worth worrying + * about - the chunks should not be duplicated! + */ + for (i=0; i<2; ++i) + { + if (user_chunk_data.location[i] == (location | have_sTER)) + write_sTER_chunk(write_ptr); + + else if (user_chunk_data.location[i] == (location | have_vpAg)) + write_vpAg_chunk(write_ptr); + } +} +#endif /* PNG_WRITE_SUPPORTED */ +#else /* !PNG_READ_USER_CHUNKS_SUPPORTED */ +# define write_chunks(pp,loc) ((void)0) #endif /* END of code to demonstrate user chunk support */ +/* START of code to check that libpng has the required text support; this only + * checks for the write support because if read support is missing the chunk + * will simply not be reported back to pngtest. + */ +#ifdef PNG_TEXT_SUPPORTED +static void +pngtest_check_text_support(png_const_structp png_ptr, png_textp text_ptr, + int num_text) +{ + while (num_text > 0) + { + switch (text_ptr[--num_text].compression) + { + case PNG_TEXT_COMPRESSION_NONE: + break; + + case PNG_TEXT_COMPRESSION_zTXt: +# ifndef PNG_WRITE_zTXt_SUPPORTED + ++unsupported_chunks; +# endif + break; + + case PNG_ITXT_COMPRESSION_NONE: + case PNG_ITXT_COMPRESSION_zTXt: +# ifndef PNG_WRITE_iTXt_SUPPORTED + ++unsupported_chunks; +# endif + break; + + default: + /* This is an error */ + png_error(png_ptr, "invalid text chunk compression field"); + break; + } + } +} +#endif +/* END of code to check that libpng has the required text support */ + /* Test one file */ -int +static int test_one_file(PNG_CONST char *inname, PNG_CONST char *outname) { static png_FILE_p fpin; static png_FILE_p fpout; /* "static" prevents setjmp corruption */ + pngtest_error_parameters error_parameters; png_structp read_ptr; png_infop read_info_ptr, end_info_ptr; #ifdef PNG_WRITE_SUPPORTED png_structp write_ptr; @@ -779,17 +821,11 @@ png_uint_32 y; png_uint_32 width, height; int num_pass, pass; int bit_depth, color_type; -#ifdef PNG_SETJMP_SUPPORTED -#ifdef USE_FAR_KEYWORD - jmp_buf tmp_jmpbuf; -#endif -#endif - - char inbuf[256], outbuf[256]; row_buf = NULL; + error_parameters.file_name = inname; if ((fpin = fopen(inname, "rb")) == NULL) { fprintf(STDERR, "Could not find input file %s\n", inname); @@ -811,22 +847,11 @@ #else read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); #endif -#ifndef PNG_STDIO_SUPPORTED - png_set_error_fn(read_ptr, (png_voidp)inname, pngtest_error, + png_set_error_fn(read_ptr, &error_parameters, pngtest_error, pngtest_warning); -#endif - -#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED - user_chunk_data[0] = 0; - user_chunk_data[1] = 0; - user_chunk_data[2] = 0; - user_chunk_data[3] = 0; - png_set_read_user_chunk_fn(read_ptr, user_chunk_data, - read_user_chunk_callback); -#endif #ifdef PNG_WRITE_SUPPORTED #if defined(PNG_USER_MEM_SUPPORTED) && PNG_DEBUG write_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, NULL, @@ -834,28 +859,28 @@ #else write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); #endif -#ifndef PNG_STDIO_SUPPORTED - png_set_error_fn(write_ptr, (png_voidp)inname, pngtest_error, + png_set_error_fn(write_ptr, &error_parameters, pngtest_error, pngtest_warning); #endif -#endif pngtest_debug("Allocating read_info, write_info and end_info structures"); read_info_ptr = png_create_info_struct(read_ptr); end_info_ptr = png_create_info_struct(read_ptr); #ifdef PNG_WRITE_SUPPORTED write_info_ptr = png_create_info_struct(write_ptr); write_end_info_ptr = png_create_info_struct(write_ptr); #endif +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + init_callback_info(read_info_ptr); + png_set_read_user_chunk_fn(read_ptr, &user_chunk_data, + read_user_chunk_callback); +#endif + #ifdef PNG_SETJMP_SUPPORTED pngtest_debug("Setting jmpbuf for read struct"); -#ifdef USE_FAR_KEYWORD - if (setjmp(tmp_jmpbuf)) -#else if (setjmp(png_jmpbuf(read_ptr))) -#endif { fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname); png_free(read_ptr, row_buf); row_buf = NULL; @@ -867,20 +892,13 @@ FCLOSE(fpin); FCLOSE(fpout); return (1); } -#ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(read_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); -#endif #ifdef PNG_WRITE_SUPPORTED pngtest_debug("Setting jmpbuf for write struct"); -#ifdef USE_FAR_KEYWORD - if (setjmp(tmp_jmpbuf)) -#else if (setjmp(png_jmpbuf(write_ptr))) -#endif { fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname); png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr); png_destroy_info_struct(write_ptr, &write_end_info_ptr); @@ -890,14 +908,36 @@ FCLOSE(fpin); FCLOSE(fpout); return (1); } - -#ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(write_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); #endif #endif + + if (strict) + { + /* Treat png_benign_error() as errors on read */ + png_set_benign_errors(read_ptr, 0); + +#ifdef PNG_WRITE_SUPPORTED + /* Treat them as errors on write */ + png_set_benign_errors(write_ptr, 0); +#endif + + /* if strict is not set, then app warnings and errors are treated as + * warnings in release builds, but not in unstable builds; this can be + * changed with '--relaxed'. + */ + } + + else if (relaxed) + { + /* Allow application (pngtest) errors and warnings to pass */ + png_set_benign_errors(read_ptr, 1); + +#ifdef PNG_WRITE_SUPPORTED + png_set_benign_errors(write_ptr, 1); #endif + } pngtest_debug("Initializing input and output streams"); #ifdef PNG_STDIO_SUPPORTED png_init_io(read_ptr, fpin); @@ -915,16 +955,8 @@ # endif # endif #endif -#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED - /* Normally one would use Z_DEFAULT_STRATEGY for text compression. - * This is here just to make pngtest replicate the results from libpng - * versions prior to 1.5.4, and to test this new API. - */ - png_set_text_compression_strategy(write_ptr, Z_FILTERED); -#endif - if (status_dots_requested == 1) { #ifdef PNG_WRITE_SUPPORTED png_set_write_status_fn(write_ptr, write_row_callback); @@ -954,26 +986,39 @@ zero_samples = 0; png_set_write_user_transform_fn(write_ptr, count_zero_samples); #endif -#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED -# ifndef PNG_HANDLE_CHUNK_ALWAYS -# define PNG_HANDLE_CHUNK_ALWAYS 3 -# endif +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + /* Preserve all the unknown chunks, if possible. If this is disabled then, + * even if the png_{get,set}_unknown_chunks stuff is enabled, we can't use + * libpng to *save* the unknown chunks on read (because we can't switch the + * save option on!) + * + * Notice that if SET_UNKNOWN_CHUNKS is *not* supported read will discard all + * unknown chunks and write will write them all. + */ +#ifdef PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED png_set_keep_unknown_chunks(read_ptr, PNG_HANDLE_CHUNK_ALWAYS, NULL, 0); #endif #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED -# ifndef PNG_HANDLE_CHUNK_IF_SAFE -# define PNG_HANDLE_CHUNK_IF_SAFE 2 -# endif - png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_IF_SAFE, + png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS, NULL, 0); #endif +#endif pngtest_debug("Reading info struct"); png_read_info(read_ptr, read_info_ptr); +#ifdef PNG_READ_USER_CHUNKS_SUPPORTED + /* This is a bit of a hack; there is no obvious way in the callback function + * to determine that the chunks before the first IDAT have been read, so + * remove the info_ptr (which is only used to determine position relative to + * PLTE) here to indicate that we are after the IDAT. + */ + user_chunk_data.info_ptr = NULL; +#endif + pngtest_debug("Transferring info struct"); { int interlace_type, compression_type, filter_type; @@ -1163,10 +1208,21 @@ if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0) { pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text); + pngtest_check_text_support(read_ptr, text_ptr, num_text); + if (verbose) - printf("\n Text compression=%d\n", text_ptr->compression); + { + int i; + + printf("\n"); + for (i=0; i 0) { pngtest_debug1("Handling %d iTXt/tEXt/zTXt chunks", num_text); + + pngtest_check_text_support(read_ptr, text_ptr, num_text); + + if (verbose) + { + int i; + + printf("\n"); + for (i=0; i 0) + { + /* We don't really expect to get here because of the setjmp handling + * above, but this is safe. + */ + fprintf(STDERR, "\n %s: %d libpng errors found (%d warnings)", + inname, error_count, warning_count); + + if (strict != 0) + return (1); + } + +# ifdef PNG_WRITE_SUPPORTED + /* If there we no write support nothing was written! */ + else if (unsupported_chunks > 0) + { + fprintf(STDERR, "\n %s: unsupported chunks (%d)%s", + inname, unsupported_chunks, strict ? ": IGNORED --strict!" : ""); + } +# endif + + else if (warning_count > 0) + { + fprintf(STDERR, "\n %s: %d libpng warnings found", + inname, warning_count); + + if (strict != 0) + return (1); + } + pngtest_debug("Opening files for comparison"); if ((fpin = fopen(inname, "rb")) == NULL) { fprintf(STDERR, "Could not find file %s\n", inname); @@ -1456,21 +1555,27 @@ FCLOSE(fpin); return (1); } +#ifdef PNG_WRITE_SUPPORTED /* else nothing was written */ + { + int wrote_question = 0; + for (;;) { png_size_t num_in, num_out; + char inbuf[256], outbuf[256]; + - num_in = fread(inbuf, 1, 1, fpin); - num_out = fread(outbuf, 1, 1, fpout); + num_in = fread(inbuf, 1, sizeof inbuf, fpin); + num_out = fread(outbuf, 1, sizeof outbuf, fpout); if (num_in != num_out) { fprintf(STDERR, "\nFiles %s and %s are of a different size\n", inname, outname); - if (wrote_question == 0) + if (wrote_question == 0 && unsupported_chunks == 0) { fprintf(STDERR, " Was %s written with the same maximum IDAT chunk size (%d bytes),", inname, PNG_ZBUF_SIZE); @@ -1484,9 +1589,9 @@ FCLOSE(fpin); FCLOSE(fpout); - if (strict != 0) + if (strict != 0 && unsupported_chunks == 0) return (1); else return (0); @@ -1494,13 +1599,14 @@ if (!num_in) break; - if (png_memcmp(inbuf, outbuf, num_in)) + if (memcmp(inbuf, outbuf, num_in)) { - fprintf(STDERR, "\nFiles %s and %s are different\n", inname, outname); + fprintf(STDERR, "\nFiles %s and %s are different\n", inname, + outname); - if (wrote_question == 0) + if (wrote_question == 0 && unsupported_chunks == 0) { fprintf(STDERR, " Was %s written with the same maximum IDAT chunk size (%d bytes),", inname, PNG_ZBUF_SIZE); @@ -1514,15 +1620,22 @@ FCLOSE(fpin); FCLOSE(fpout); - if (strict != 0) + /* NOTE: the unsupported_chunks escape is permitted here because + * unsupported text chunk compression will result in the compression + * mode being changed (to NONE) yet, in the test case, the result + * can be exactly the same size! + */ + if (strict != 0 && unsupported_chunks == 0) return (1); else return (0); } } + } +#endif /* PNG_WRITE_SUPPORTED */ FCLOSE(fpin); FCLOSE(fpout); @@ -1606,8 +1719,18 @@ status_dots_requested = 0; verbose = 1; inname = argv[2]; strict++; + relaxed = 0; + } + + else if (strcmp(argv[1], "--relaxed") == 0) + { + status_dots_requested = 0; + verbose = 1; + inname = argv[2]; + strict = 0; + relaxed++; } else { @@ -1814,7 +1937,16 @@ fprintf(STDERR, " libpng FAILS test\n"); return (int)(ierror != 0); } +#else +int +main(void) +{ + fprintf(STDERR, + " test ignored because libpng was not built with read support\n"); + return 0; +} +#endif /* Generate a compiler error if there is an old png.h in the search path. */ typedef png_libpng_version_%_VER_% Your_png_h_is_not_version_%_VER_%; diff -ru4NwbB libpng-1.5.13/pngtrans.c libpng-1.6.0beta32/pngtrans.c --- libpng-1.5.13/pngtrans.c 2012-09-27 06:21:19.780976904 -0500 +++ libpng-1.6.0beta32/pngtrans.c 2012-11-25 12:40:10.159659625 -0600 @@ -1,8 +1,8 @@ /* pngtrans.c - transforms the data in a row (used by both readers and writers) * - * Last changed in libpng 1.5.11 [June 14, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -17,9 +17,9 @@ #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) /* Turn on BGR-to-RGB mapping */ void PNGAPI -png_set_bgr(png_structp png_ptr) +png_set_bgr(png_structrp png_ptr) { png_debug(1, "in png_set_bgr"); if (png_ptr == NULL) @@ -31,9 +31,9 @@ #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) /* Turn on 16 bit byte swapping */ void PNGAPI -png_set_swap(png_structp png_ptr) +png_set_swap(png_structrp png_ptr) { png_debug(1, "in png_set_swap"); if (png_ptr == NULL) @@ -46,9 +46,9 @@ #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) /* Turn on pixel packing */ void PNGAPI -png_set_packing(png_structp png_ptr) +png_set_packing(png_structrp png_ptr) { png_debug(1, "in png_set_packing"); if (png_ptr == NULL) @@ -64,9 +64,9 @@ #if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED) /* Turn on packed pixel swapping */ void PNGAPI -png_set_packswap(png_structp png_ptr) +png_set_packswap(png_structrp png_ptr) { png_debug(1, "in png_set_packswap"); if (png_ptr == NULL) @@ -78,9 +78,9 @@ #endif #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) void PNGAPI -png_set_shift(png_structp png_ptr, png_const_color_8p true_bits) +png_set_shift(png_structrp png_ptr, png_const_color_8p true_bits) { png_debug(1, "in png_set_shift"); if (png_ptr == NULL) @@ -93,9 +93,9 @@ #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ defined(PNG_WRITE_INTERLACING_SUPPORTED) int PNGAPI -png_set_interlace_handling(png_structp png_ptr) +png_set_interlace_handling(png_structrp png_ptr) { png_debug(1, "in png_set_interlace handling"); if (png_ptr && png_ptr->interlaced) @@ -114,62 +114,111 @@ * for 48-bit input data, as well as to avoid problems with some compilers * that don't like bytes as parameters. */ void PNGAPI -png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc) +png_set_filler(png_structrp png_ptr, png_uint_32 filler, int filler_loc) { png_debug(1, "in png_set_filler"); if (png_ptr == NULL) return; - png_ptr->transformations |= PNG_FILLER; + /* In libpng 1.6 it is possible to determine whether this is a read or write + * operation and therefore to do more checking here for a valid call. + */ + if (png_ptr->mode & PNG_IS_READ_STRUCT) + { +# ifdef PNG_READ_FILLER_SUPPORTED + /* On read png_set_filler is always valid, regardless of the base PNG + * format, because other transformations can give a format where the + * filler code can execute (basically an 8 or 16-bit component RGB or G + * format.) + * + * NOTE: usr_channels is not used by the read code! (This has led to + * confusion in the past.) The filler is only used in the read code. + */ png_ptr->filler = (png_uint_16)filler; +# else + png_app_error(png_ptr, "png_set_filler not supported on read"); + PNG_UNUSED(filler) /* not used in the write case */ + return; +# endif + } - if (filler_loc == PNG_FILLER_AFTER) - png_ptr->flags |= PNG_FLAG_FILLER_AFTER; - - else - png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; - - /* This should probably go in the "do_read_filler" routine. - * I attempted to do that in libpng-1.0.1a but that caused problems - * so I restored it in libpng-1.0.2a + else /* write */ + { +# ifdef PNG_WRITE_FILLER_SUPPORTED + /* On write the usr_channels parameter must be set correctly at the + * start to record the number of channels in the app-supplied data. */ - - if (png_ptr->color_type == PNG_COLOR_TYPE_RGB) + switch (png_ptr->color_type) { + case PNG_COLOR_TYPE_RGB: png_ptr->usr_channels = 4; - } - - /* Also I added this in libpng-1.0.2a (what happens when we expand - * a less-than-8-bit grayscale to GA?) */ + break; - if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8) + case PNG_COLOR_TYPE_GRAY: + if (png_ptr->bit_depth >= 8) { png_ptr->usr_channels = 2; + break; + } + + else + { + /* There simply isn't any code in libpng to strip out bits + * from bytes when the components are less than a byte in + * size! + */ + png_app_error(png_ptr, + "png_set_filler is invalid for low bit depth gray output"); + return; } + + default: + png_app_error(png_ptr, + "png_set_filler: inappropriate color type"); + return; + } +# else + png_app_error(png_ptr, "png_set_filler not supported on write"); + return; +# endif + } + + /* Here on success - libpng supports the operation, set the transformation + * and the flag to say where the filler channel is. + */ + png_ptr->transformations |= PNG_FILLER; + + if (filler_loc == PNG_FILLER_AFTER) + png_ptr->flags |= PNG_FLAG_FILLER_AFTER; + + else + png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER; } /* Added to libpng-1.2.7 */ void PNGAPI -png_set_add_alpha(png_structp png_ptr, png_uint_32 filler, int filler_loc) +png_set_add_alpha(png_structrp png_ptr, png_uint_32 filler, int filler_loc) { png_debug(1, "in png_set_add_alpha"); if (png_ptr == NULL) return; png_set_filler(png_ptr, filler, filler_loc); + /* The above may fail to do anything. */ + if (png_ptr->transformations & PNG_FILLER) png_ptr->transformations |= PNG_ADD_ALPHA; } #endif #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) void PNGAPI -png_set_swap_alpha(png_structp png_ptr) +png_set_swap_alpha(png_structrp png_ptr) { png_debug(1, "in png_set_swap_alpha"); if (png_ptr == NULL) @@ -181,9 +230,9 @@ #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) void PNGAPI -png_set_invert_alpha(png_structp png_ptr) +png_set_invert_alpha(png_structrp png_ptr) { png_debug(1, "in png_set_invert_alpha"); if (png_ptr == NULL) @@ -194,9 +243,9 @@ #endif #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) void PNGAPI -png_set_invert_mono(png_structp png_ptr) +png_set_invert_mono(png_structrp png_ptr) { png_debug(1, "in png_set_invert_mono"); if (png_ptr == NULL) @@ -622,9 +671,9 @@ #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) /* Added at libpng-1.5.10 */ void /* PRIVATE */ -png_do_check_palette_indexes(png_structp png_ptr, png_row_infop row_info) +png_do_check_palette_indexes(png_structrp png_ptr, png_row_infop row_info) { if (png_ptr->num_palette < (1 << row_info->bit_depth) && png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */ { @@ -725,9 +774,9 @@ #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED void PNGAPI -png_set_user_transform_info(png_structp png_ptr, png_voidp +png_set_user_transform_info(png_structrp png_ptr, png_voidp user_transform_ptr, int user_transform_depth, int user_transform_channels) { png_debug(1, "in png_set_user_transform_info"); @@ -745,20 +794,20 @@ * are called. */ #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED png_voidp PNGAPI -png_get_user_transform_ptr(png_const_structp png_ptr) +png_get_user_transform_ptr(png_const_structrp png_ptr) { if (png_ptr == NULL) return (NULL); - return ((png_voidp)png_ptr->user_transform_ptr); + return png_ptr->user_transform_ptr; } #endif #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED png_uint_32 PNGAPI -png_get_current_row_number(png_const_structp png_ptr) +png_get_current_row_number(png_const_structrp png_ptr) { /* See the comments in png.h - this is the sub-image row when reading and * interlaced image. */ @@ -768,9 +817,9 @@ return PNG_UINT_32_MAX; /* help the app not to fail silently */ } png_byte PNGAPI -png_get_current_pass_number(png_const_structp png_ptr) +png_get_current_pass_number(png_const_structrp png_ptr) { if (png_ptr != NULL) return png_ptr->pass; return 8; /* invalid */ diff -ru4NwbB libpng-1.5.13/pngwio.c libpng-1.6.0beta32/pngwio.c --- libpng-1.5.13/pngwio.c 2012-09-27 06:21:19.786789624 -0500 +++ libpng-1.6.0beta32/pngwio.c 2012-11-25 12:40:10.165272754 -0600 @@ -1,9 +1,9 @@ /* pngwio.c - functions for data output * - * Last changed in libpng 1.5.0 [January 6, 2011] - * Copyright (c) 1998-2011 Glenn Randers-Pehrson + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] + * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * * This code is released under the libpng license. @@ -29,13 +29,14 @@ * to write more than 64K on a 16 bit machine. */ void /* PRIVATE */ -png_write_data(png_structp png_ptr, png_const_bytep data, png_size_t length) +png_write_data(png_structrp png_ptr, png_const_bytep data, png_size_t length) { /* NOTE: write_data_fn must not change the buffer! */ if (png_ptr->write_data_fn != NULL ) - (*(png_ptr->write_data_fn))(png_ptr, (png_bytep)data, length); + (*(png_ptr->write_data_fn))(png_ptr, png_constcast(png_bytep,data), + length); else png_error(png_ptr, "Call to NULL write function"); } @@ -45,9 +46,8 @@ * not writing to a standard C stream, you should create a replacement * write_data function and use it at run time with png_set_write_fn(), rather * than changing the library. */ -#ifndef USE_FAR_KEYWORD void PNGCBAPI png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) { png_size_t check; @@ -59,75 +59,17 @@ if (check != length) png_error(png_ptr, "Write Error"); } -#else -/* This is the model-independent version. Since the standard I/O library - * can't handle far buffers in the medium and small models, we have to copy - * the data. - */ - -#define NEAR_BUF_SIZE 1024 -#define MIN(a,b) (a <= b ? a : b) - -void PNGCBAPI -png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length) -{ - png_uint_32 check; - png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */ - png_FILE_p io_ptr; - - if (png_ptr == NULL) - return; - - /* Check if data really is near. If so, use usual code. */ - near_data = (png_byte *)CVT_PTR_NOCHECK(data); - io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr); - - if ((png_bytep)near_data == data) - { - check = fwrite(near_data, 1, length, io_ptr); - } - - else - { - png_byte buf[NEAR_BUF_SIZE]; - png_size_t written, remaining, err; - check = 0; - remaining = length; - - do - { - written = MIN(NEAR_BUF_SIZE, remaining); - png_memcpy(buf, data, written); /* Copy far buffer to near buffer */ - err = fwrite(buf, 1, written, io_ptr); - - if (err != written) - break; - - else - check += err; - - data += written; - remaining -= written; - } - while (remaining != 0); - } - - if (check != length) - png_error(png_ptr, "Write Error"); -} - -#endif #endif /* This function is called to output any data pending writing (normally * to disk). After png_flush is called, there should be no data pending * writing in any buffers. */ #ifdef PNG_WRITE_FLUSH_SUPPORTED void /* PRIVATE */ -png_flush(png_structp png_ptr) +png_flush(png_structrp png_ptr) { if (png_ptr->output_flush_fn != NULL) (*(png_ptr->output_flush_fn))(png_ptr); } @@ -140,9 +82,9 @@ if (png_ptr == NULL) return; - io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr)); + io_ptr = png_voidcast(png_FILE_p, (png_ptr->io_ptr)); fflush(io_ptr); } # endif #endif @@ -176,9 +118,9 @@ * a good idea if io_ptr does not point to a standard * *FILE structure. */ void PNGAPI -png_set_write_fn(png_structp png_ptr, png_voidp io_ptr, +png_set_write_fn(png_structrp png_ptr, png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn) { if (png_ptr == NULL) return; @@ -218,37 +160,5 @@ "Can't set both read_data_fn and write_data_fn in the" " same structure"); } } - -#ifdef USE_FAR_KEYWORD -# ifdef _MSC_VER -void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) -{ - void *near_ptr; - void FAR *far_ptr; - FP_OFF(near_ptr) = FP_OFF(ptr); - far_ptr = (void FAR *)near_ptr; - - if (check != 0) - if (FP_SEG(ptr) != FP_SEG(far_ptr)) - png_error(png_ptr, "segment lost in conversion"); - - return(near_ptr); -} -# else -void *png_far_to_near(png_structp png_ptr, png_voidp ptr, int check) -{ - void *near_ptr; - void FAR *far_ptr; - near_ptr = (void FAR *)ptr; - far_ptr = (void FAR *)near_ptr; - - if (check != 0) - if (far_ptr != ptr) - png_error(png_ptr, "segment lost in conversion"); - - return(near_ptr); -} -# endif -#endif #endif /* PNG_WRITE_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/pngwrite.c libpng-1.6.0beta32/pngwrite.c --- libpng-1.5.13/pngwrite.c 2012-09-27 06:21:19.796256591 -0500 +++ libpng-1.6.0beta32/pngwrite.c 2012-11-25 12:40:10.176608026 -0600 @@ -1,8 +1,8 @@ /* pngwrite.c - general routines to write a PNG file * - * Last changed in libpng 1.5.11 [June 14, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -11,11 +11,67 @@ * and license in png.h */ #include "pngpriv.h" +#if defined PNG_SIMPLIFIED_WRITE_SUPPORTED && defined PNG_STDIO_SUPPORTED +# include +#endif #ifdef PNG_WRITE_SUPPORTED +#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED +/* Write out all the unknown chunks for the current given location */ +static void +write_unknown_chunks(png_structrp png_ptr, png_const_inforp info_ptr, + unsigned int where) +{ + if (info_ptr->unknown_chunks_num) + { + png_const_unknown_chunkp up; + + png_debug(5, "writing extra chunks"); + + for (up = info_ptr->unknown_chunks; + up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; + ++up) + if (up->location & where) + { + /* If per-chunk unknown chunk handling is enabled use it, otherwise + * just write the chunks the application has set. + */ +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + int keep = png_handle_as_unknown(png_ptr, up->name); + + /* NOTE: this code is radically different from the read side in the + * matter of handling an ancillary unknown chunk. In the read side + * the default behavior is to discard it, in the code below the default + * behavior is to write it. Critical chunks are, however, only + * written if explicitly listed or if the default is set to write all + * unknown chunks. + * + * The default handling is also slightly weird - it is not possible to + * stop the writing of all unsafe-to-copy chunks! + * + * TODO: REVIEW: this would seem to be a bug. + */ + if (keep != PNG_HANDLE_CHUNK_NEVER && + ((up->name[3] & 0x20) /* safe-to-copy overrides everything */ || + keep == PNG_HANDLE_CHUNK_ALWAYS || + (keep == PNG_HANDLE_CHUNK_AS_DEFAULT && + png_ptr->unknown_default == PNG_HANDLE_CHUNK_ALWAYS))) +#endif + { + /* TODO: review, what is wrong with a zero length unknown chunk? */ + if (up->size == 0) + png_warning(png_ptr, "Writing zero-length unknown chunk"); + + png_write_chunk(png_ptr, up->name, up->data, up->size); + } + } + } +} +#endif /* PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED */ + /* Writes all the PNG information. This is the suggested way to use the * library. If you have a new chunk to add, make a function to write it, * and put it in the correct location here. If you want the chunk written * after the image data, put it in png_write_end(). I strongly encourage @@ -24,9 +80,9 @@ * write a plain PNG file. If you have long comments, I suggest writing * them in png_write_end(), and compressing them. */ void PNGAPI -png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr) +png_write_info_before_PLTE(png_structrp png_ptr, png_const_inforp info_ptr) { png_debug(1, "in png_write_info_before_PLTE"); if (png_ptr == NULL || info_ptr == NULL) @@ -50,71 +106,84 @@ png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height, info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type, info_ptr->filter_type, #ifdef PNG_WRITE_INTERLACING_SUPPORTED - info_ptr->interlace_type); + info_ptr->interlace_type #else - 0); + 0 #endif + ); + /* The rest of these check to see if the valid field has the appropriate * flag set, and if it does, writes the chunk. + * + * 1.6.0: COLORSPACE support controls the writing of these chunks too, and + * the chunks will be written if the WRITE routine is there and information + * is available in the COLORSPACE. (See png_colorspace_sync_info in png.c + * for where the valid flags get set.) + * + * Under certain circumstances the colorspace can be invalidated without + * syncing the info_struct 'valid' flags; this happens if libpng detects and + * error and calls png_error while the color space is being set, yet the + * application continues writing the PNG. So check the 'invalid' flag here + * too. */ +#ifdef PNG_GAMMA_SUPPORTED #ifdef PNG_WRITE_gAMA_SUPPORTED - if (info_ptr->valid & PNG_INFO_gAMA) - png_write_gAMA_fixed(png_ptr, info_ptr->gamma); + if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && + (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_gAMA) && + (info_ptr->valid & PNG_INFO_gAMA)) + png_write_gAMA_fixed(png_ptr, info_ptr->colorspace.gamma); #endif +#endif + +#ifdef PNG_COLORSPACE_SUPPORTED + /* Write only one of sRGB or an ICC profile. If a profile was supplied + * and it matches one of the known sRGB ones issue a warning. + */ +# ifdef PNG_WRITE_iCCP_SUPPORTED + if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && + (info_ptr->valid & PNG_INFO_iCCP)) + { #ifdef PNG_WRITE_sRGB_SUPPORTED if (info_ptr->valid & PNG_INFO_sRGB) - png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent); + png_app_warning(png_ptr, + "profile matches sRGB but writing iCCP instead"); #endif -#ifdef PNG_WRITE_iCCP_SUPPORTED - if (info_ptr->valid & PNG_INFO_iCCP) - png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE, - (png_charp)info_ptr->iccp_profile, (int)info_ptr->iccp_proflen); + png_write_iCCP(png_ptr, info_ptr->iccp_name, + info_ptr->iccp_profile); + } +# ifdef PNG_WRITE_sRGB_SUPPORTED + else +# endif #endif + +# ifdef PNG_WRITE_sRGB_SUPPORTED + if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && + (info_ptr->valid & PNG_INFO_sRGB)) + png_write_sRGB(png_ptr, info_ptr->colorspace.rendering_intent); +# endif /* WRITE_sRGB */ +#endif /* COLORSPACE */ + #ifdef PNG_WRITE_sBIT_SUPPORTED if (info_ptr->valid & PNG_INFO_sBIT) png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type); #endif + +#ifdef PNG_COLORSPACE_SUPPORTED #ifdef PNG_WRITE_cHRM_SUPPORTED - if (info_ptr->valid & PNG_INFO_cHRM) - png_write_cHRM_fixed(png_ptr, - info_ptr->x_white, info_ptr->y_white, - info_ptr->x_red, info_ptr->y_red, - info_ptr->x_green, info_ptr->y_green, - info_ptr->x_blue, info_ptr->y_blue); + if (!(info_ptr->colorspace.flags & PNG_COLORSPACE_INVALID) && + (info_ptr->colorspace.flags & PNG_COLORSPACE_FROM_cHRM) && + (info_ptr->valid & PNG_INFO_cHRM)) + png_write_cHRM_fixed(png_ptr, &info_ptr->colorspace.end_points_xy); +# endif #endif #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED - if (info_ptr->unknown_chunks_num) - { - png_unknown_chunk *up; - - png_debug(5, "writing extra chunks"); - - for (up = info_ptr->unknown_chunks; - up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; - up++) - { - int keep = png_handle_as_unknown(png_ptr, up->name); - - if (keep != PNG_HANDLE_CHUNK_NEVER && - up->location && - !(up->location & PNG_HAVE_PLTE) && - !(up->location & PNG_HAVE_IDAT) && - !(up->location & PNG_AFTER_IDAT) && - ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || - (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) - { - if (up->size == 0) - png_warning(png_ptr, "Writing zero-length unknown chunk"); - - png_write_chunk(png_ptr, up->name, up->data, up->size); - } - } - } + write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_IHDR); #endif + png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE; } } @@ -118,9 +187,9 @@ } } void PNGAPI -png_write_info(png_structp png_ptr, png_infop info_ptr) +png_write_info(png_structrp png_ptr, png_const_inforp info_ptr) { #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) int i; #endif @@ -262,31 +331,9 @@ } #endif /* tEXt */ #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED - if (info_ptr->unknown_chunks_num) - { - png_unknown_chunk *up; - - png_debug(5, "writing extra chunks"); - - for (up = info_ptr->unknown_chunks; - up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; - up++) - { - int keep = png_handle_as_unknown(png_ptr, up->name); - if (keep != PNG_HANDLE_CHUNK_NEVER && - up->location && - (up->location & PNG_HAVE_PLTE) && - !(up->location & PNG_HAVE_IDAT) && - !(up->location & PNG_AFTER_IDAT) && - ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || - (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) - { - png_write_chunk(png_ptr, up->name, up->data, up->size); - } - } - } + write_unknown_chunks(png_ptr, info_ptr, PNG_HAVE_PLTE); #endif } /* Writes the end of the PNG file. If you don't want to write comments or @@ -294,9 +341,9 @@ * in png_write_info(), do not write them again here. If you have long * comments, I suggest writing them here, and compressing them. */ void PNGAPI -png_write_end(png_structp png_ptr, png_infop info_ptr) +png_write_end(png_structrp png_ptr, png_inforp info_ptr) { png_debug(1, "in png_write_end"); if (png_ptr == NULL) @@ -376,29 +423,9 @@ } } #endif #ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED - if (info_ptr->unknown_chunks_num) - { - png_unknown_chunk *up; - - png_debug(5, "writing extra chunks"); - - for (up = info_ptr->unknown_chunks; - up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num; - up++) - { - int keep = png_handle_as_unknown(png_ptr, up->name); - if (keep != PNG_HANDLE_CHUNK_NEVER && - up->location && - (up->location & PNG_AFTER_IDAT) && - ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS || - (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS))) - { - png_write_chunk(png_ptr, up->name, up->data, up->size); - } - } - } + write_unknown_chunks(png_ptr, info_ptr, PNG_AFTER_IDAT); #endif } png_ptr->mode |= PNG_AFTER_IDAT; @@ -421,9 +448,9 @@ #ifdef PNG_CONVERT_tIME_SUPPORTED /* "tm" structure is not supported on WindowsCE */ void PNGAPI -png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR * ttime) +png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm * ttime) { png_debug(1, "in png_convert_from_struct_tm"); ptime->year = (png_uint_16)(1900 + ttime->tm_year); @@ -450,106 +477,74 @@ PNG_FUNCTION(png_structp,PNGAPI png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED) { -#ifdef PNG_USER_MEM_SUPPORTED - return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn, - warn_fn, NULL, NULL, NULL)); +#ifndef PNG_USER_MEM_SUPPORTED + png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr, + error_fn, warn_fn, NULL, NULL, NULL); +#else + return png_create_write_struct_2(user_png_ver, error_ptr, error_fn, + warn_fn, NULL, NULL, NULL); } /* Alternate initialize png_ptr structure, and allocate any memory needed */ -static void png_reset_filter_heuristics(png_structp png_ptr); /* forward decl */ - PNG_FUNCTION(png_structp,PNGAPI png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),PNG_ALLOCATED) { + png_structrp png_ptr = png_create_png_struct(user_png_ver, error_ptr, + error_fn, warn_fn, mem_ptr, malloc_fn, free_fn); #endif /* PNG_USER_MEM_SUPPORTED */ - volatile int png_cleanup_needed = 0; -#ifdef PNG_SETJMP_SUPPORTED - volatile -#endif - png_structp png_ptr; -#ifdef PNG_SETJMP_SUPPORTED -#ifdef USE_FAR_KEYWORD - jmp_buf tmp_jmpbuf; -#endif -#endif - png_debug(1, "in png_create_write_struct"); - -#ifdef PNG_USER_MEM_SUPPORTED - png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG, - (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr); -#else - png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG); -#endif /* PNG_USER_MEM_SUPPORTED */ - if (png_ptr == NULL) - return (NULL); + /* Set the zlib control values to defaults; they can be overridden by the + * application after the struct has been created. + */ + png_ptr->zbuffer_size = PNG_ZBUF_SIZE; - /* Added at libpng-1.2.6 */ -#ifdef PNG_SET_USER_LIMITS_SUPPORTED - png_ptr->user_width_max = PNG_USER_WIDTH_MAX; - png_ptr->user_height_max = PNG_USER_HEIGHT_MAX; + png_ptr->zlib_strategy = Z_FILTERED; /* may be overridden if no filters */ + png_ptr->zlib_level = Z_DEFAULT_COMPRESSION; + png_ptr->zlib_mem_level = 8; + png_ptr->zlib_window_bits = 15; + png_ptr->zlib_method = 8; + +#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED + png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY; + png_ptr->zlib_text_level = Z_DEFAULT_COMPRESSION; + png_ptr->zlib_text_mem_level = 8; + png_ptr->zlib_text_window_bits = 15; + png_ptr->zlib_text_method = 8; +#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ + + /* This is a highly dubious configuration option; by default it is off, but + * it may be appropriate for private builds that are testing extensions not + * conformant to the current specification, or of applications that must not + * fail to write at all costs! + */ +# ifdef PNG_BENIGN_WRITE_ERRORS_SUPPORTED + png_ptr->flags |= PNG_FLAG_BENIGN_ERRORS_WARN; + /* In stable builds only warn if an application error can be completely + * handled. + */ #endif -#ifdef PNG_SETJMP_SUPPORTED -/* Applications that neglect to set up their own setjmp() and then - * encounter a png_error() will longjmp here. Since the jmpbuf is - * then meaningless we abort instead of returning. + /* App warnings are warnings in release (or release candidate) builds but + * are errors during development. */ -#ifdef USE_FAR_KEYWORD - if (setjmp(tmp_jmpbuf)) -#else - if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */ -#endif -#ifdef USE_FAR_KEYWORD - png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf)); +# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC + png_ptr->flags |= PNG_FLAG_APP_WARNINGS_WARN; #endif - PNG_ABORT(); -#endif - -#ifdef PNG_USER_MEM_SUPPORTED - png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn); -#endif /* PNG_USER_MEM_SUPPORTED */ - png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn); - - if (!png_user_version_check(png_ptr, user_png_ver)) - png_cleanup_needed = 1; - - /* Initialize zbuf - compression buffer */ - png_ptr->zbuf_size = PNG_ZBUF_SIZE; - - if (!png_cleanup_needed) - { - png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr, - png_ptr->zbuf_size); - if (png_ptr->zbuf == NULL) - png_cleanup_needed = 1; - } - if (png_cleanup_needed) + if (png_ptr != NULL) { - /* Clean up PNG structure and deallocate any memory. */ - png_free(png_ptr, png_ptr->zbuf); - png_ptr->zbuf = NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, - (png_free_ptr)free_fn, (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); -#endif - return (NULL); - } - + /* TODO: delay this, it can be done in png_init_io() (if the app doesn't + * do it itself) avoiding setting the default function if it is not + * required. + */ png_set_write_fn(png_ptr, NULL, NULL, NULL); + } -#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED - png_reset_filter_heuristics(png_ptr); -#endif - - return (png_ptr); + return png_ptr; } /* Write a few rows of image data. If the image is interlaced, @@ -557,9 +552,9 @@ * have called png_set_interlace_handling(), you will have to * "write" the image seven times. */ void PNGAPI -png_write_rows(png_structp png_ptr, png_bytepp row, +png_write_rows(png_structrp png_ptr, png_bytepp row, png_uint_32 num_rows) { png_uint_32 i; /* row counter */ png_bytepp rp; /* row pointer */ @@ -579,9 +574,9 @@ /* Write the image. You only need to call this function once, even * if you are writing an interlaced image. */ void PNGAPI -png_write_image(png_structp png_ptr, png_bytepp image) +png_write_image(png_structrp png_ptr, png_bytepp image) { png_uint_32 i; /* row index */ int pass, num_pass; /* pass variables */ png_bytepp rp; /* points to current row */ @@ -611,9 +606,9 @@ } /* Called by user to write a row of image data */ void PNGAPI -png_write_row(png_structp png_ptr, png_const_bytep row) +png_write_row(png_structrp png_ptr, png_const_bytep row) { /* 1.5.6: moved from png_struct to be a local structure: */ png_row_info row_info; @@ -754,9 +749,9 @@ png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth); png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)row_info.rowbytes); /* Copy user's row into buffer, leaving room for filter byte. */ - png_memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes); + memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes); #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Handle interlacing */ if (png_ptr->interlaced && png_ptr->pass < 6 && @@ -820,9 +815,9 @@ #ifdef PNG_WRITE_FLUSH_SUPPORTED /* Set the automatic flush interval or 0 to turn flushing off */ void PNGAPI -png_set_flush(png_structp png_ptr, int nrows) +png_set_flush(png_structrp png_ptr, int nrows) { png_debug(1, "in png_set_flush"); if (png_ptr == NULL) @@ -832,12 +827,10 @@ } /* Flush the current output buffers now */ void PNGAPI -png_write_flush(png_structp png_ptr) +png_write_flush(png_structrp png_ptr) { - int wrote_IDAT; - png_debug(1, "in png_write_flush"); if (png_ptr == NULL) return; @@ -845,135 +838,30 @@ /* We have already written out all of the data */ if (png_ptr->row_number >= png_ptr->num_rows) return; - do - { - int ret; - - /* Compress the data */ - ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH); - wrote_IDAT = 0; - - /* Check for compression errors */ - if (ret != Z_OK) - { - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); - - else - png_error(png_ptr, "zlib error"); - } - - if (!(png_ptr->zstream.avail_out)) - { - /* Write the IDAT and reset the zlib output buffer */ - png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - wrote_IDAT = 1; - } - } while (wrote_IDAT == 1); - - /* If there is any data left to be output, write it into a new IDAT */ - if (png_ptr->zbuf_size != png_ptr->zstream.avail_out) - { - /* Write the IDAT and reset the zlib output buffer */ - png_write_IDAT(png_ptr, png_ptr->zbuf, - png_ptr->zbuf_size - png_ptr->zstream.avail_out); - } + png_compress_IDAT(png_ptr, NULL, 0, Z_SYNC_FLUSH); png_ptr->flush_rows = 0; png_flush(png_ptr); } #endif /* PNG_WRITE_FLUSH_SUPPORTED */ -/* Free all memory used by the write */ -void PNGAPI -png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) -{ - png_structp png_ptr = NULL; - png_infop info_ptr = NULL; -#ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn = NULL; - png_voidp mem_ptr = NULL; -#endif - - png_debug(1, "in png_destroy_write_struct"); - - if (png_ptr_ptr != NULL) - png_ptr = *png_ptr_ptr; - -#ifdef PNG_USER_MEM_SUPPORTED - if (png_ptr != NULL) - { - free_fn = png_ptr->free_fn; - mem_ptr = png_ptr->mem_ptr; - } -#endif - - if (info_ptr_ptr != NULL) - info_ptr = *info_ptr_ptr; - - if (info_ptr != NULL) - { - if (png_ptr != NULL) - { - png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1); - -#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED - if (png_ptr->num_chunk_list) - { - png_free(png_ptr, png_ptr->chunk_list); - png_ptr->num_chunk_list = 0; - } -#endif - } - -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)info_ptr); +#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED +static void png_reset_filter_heuristics(png_structrp png_ptr);/* forward decl */ #endif - *info_ptr_ptr = NULL; - } - if (png_ptr != NULL) +/* Free any memory used in png_ptr struct without freeing the struct itself. */ +static void +png_write_destroy(png_structrp png_ptr) { - png_write_destroy(png_ptr); -#ifdef PNG_USER_MEM_SUPPORTED - png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn, - (png_voidp)mem_ptr); -#else - png_destroy_struct((png_voidp)png_ptr); -#endif - *png_ptr_ptr = NULL; - } -} - - -/* Free any memory used in png_ptr struct (old method) */ -void /* PRIVATE */ -png_write_destroy(png_structp png_ptr) -{ -#ifdef PNG_SETJMP_SUPPORTED - jmp_buf tmp_jmp; /* Save jump buffer */ -#endif - png_error_ptr error_fn; -#ifdef PNG_WARNINGS_SUPPORTED - png_error_ptr warning_fn; -#endif - png_voidp error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - png_free_ptr free_fn; -#endif - png_debug(1, "in png_write_destroy"); /* Free any memory zlib uses */ - if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED) + if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) deflateEnd(&png_ptr->zstream); /* Free our memory. png_free checks NULL for us. */ - png_free(png_ptr, png_ptr->zbuf); + png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list); png_free(png_ptr, png_ptr->row_buf); #ifdef PNG_WRITE_FILTER_SUPPORTED png_free(png_ptr, png_ptr->prev_row); png_free(png_ptr, png_ptr->sub_row); @@ -988,41 +876,48 @@ png_free(png_ptr, png_ptr->filter_costs); png_free(png_ptr, png_ptr->inv_filter_costs); #endif -#ifdef PNG_SETJMP_SUPPORTED - /* Reset structure */ - png_memcpy(tmp_jmp, png_ptr->longjmp_buffer, png_sizeof(jmp_buf)); +#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED + png_free(png_ptr, png_ptr->chunk_list); #endif - error_fn = png_ptr->error_fn; -#ifdef PNG_WARNINGS_SUPPORTED - warning_fn = png_ptr->warning_fn; -#endif - error_ptr = png_ptr->error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - free_fn = png_ptr->free_fn; -#endif + /* The error handling and memory handling information is left intact at this + * point: the jmp_buf may still have to be freed. See png_destroy_png_struct + * for how this happens. + */ +} + +/* Free all memory used by the write. + * In libpng 1.6.0 this API changed quietly to no longer accept a NULL value for + * *png_ptr_ptr. Prior to 1.6.0 it would accept such a value and it would free + * the passed in info_structs but it would quietly fail to free any of the data + * inside them. In 1.6.0 it quietly does nothing (it has to be quiet because it + * has no png_ptr.) + */ +void PNGAPI +png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr) +{ + png_debug(1, "in png_destroy_write_struct"); - png_memset(png_ptr, 0, png_sizeof(png_struct)); + if (png_ptr_ptr != NULL) + { + png_structrp png_ptr = *png_ptr_ptr; - png_ptr->error_fn = error_fn; -#ifdef PNG_WARNINGS_SUPPORTED - png_ptr->warning_fn = warning_fn; -#endif - png_ptr->error_ptr = error_ptr; -#ifdef PNG_USER_MEM_SUPPORTED - png_ptr->free_fn = free_fn; -#endif + if (png_ptr != NULL) /* added in libpng 1.6.0 */ + { + png_destroy_info_struct(png_ptr, info_ptr_ptr); -#ifdef PNG_SETJMP_SUPPORTED - png_memcpy(png_ptr->longjmp_buffer, tmp_jmp, png_sizeof(jmp_buf)); -#endif + *png_ptr_ptr = NULL; + png_write_destroy(png_ptr); + png_destroy_png_struct(png_ptr); + } + } } /* Allow the application to select one or more row filters to use. */ void PNGAPI -png_set_filter(png_structp png_ptr, int method, int filters) +png_set_filter(png_structrp png_ptr, int method, int filters) { png_debug(1, "in png_set_filter"); if (png_ptr == NULL) @@ -1155,9 +1050,9 @@ */ #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */ /* Convenience reset API. */ static void -png_reset_filter_heuristics(png_structp png_ptr) +png_reset_filter_heuristics(png_structrp png_ptr) { /* Clear out any old values in the 'weights' - this must be done because if * the app calls set_filter_heuristics multiple times with different * 'num_weights' values we would otherwise potentially have wrong sized @@ -1188,9 +1083,9 @@ /* Leave the filter_costs - this array is fixed size. */ } static int -png_init_filter_heuristics(png_structp png_ptr, int heuristic_method, +png_init_filter_heuristics(png_structrp png_ptr, int heuristic_method, int num_weights) { if (png_ptr == NULL) return 0; @@ -1208,21 +1103,21 @@ if (num_weights > 0) { png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_byte) * num_weights)); + (png_uint_32)((sizeof (png_byte)) * num_weights)); /* To make sure that the weighting starts out fairly */ for (i = 0; i < num_weights; i++) { png_ptr->prev_filters[i] = 255; } png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); + (png_uint_32)((sizeof (png_uint_16)) * num_weights)); png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_uint_16) * num_weights)); + (png_uint_32)((sizeof (png_uint_16)) * num_weights)); for (i = 0; i < num_weights; i++) { png_ptr->inv_filter_weights[i] = @@ -1238,12 +1133,12 @@ */ if (png_ptr->filter_costs == NULL) { png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); + (png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST)); png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr, - (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST)); + (png_uint_32)((sizeof (png_uint_16)) * PNG_FILTER_VALUE_LAST)); } for (i = 0; i < PNG_FILTER_VALUE_LAST; i++) { @@ -1271,9 +1166,9 @@ /* Provide floating and fixed point APIs */ #ifdef PNG_FLOATING_POINT_SUPPORTED void PNGAPI -png_set_filter_heuristics(png_structp png_ptr, int heuristic_method, +png_set_filter_heuristics(png_structrp png_ptr, int heuristic_method, int num_weights, png_const_doublep filter_weights, png_const_doublep filter_costs) { png_debug(1, "in png_set_filter_heuristics"); @@ -1326,9 +1221,9 @@ #endif /* FLOATING_POINT */ #ifdef PNG_FIXED_POINT_SUPPORTED void PNGAPI -png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method, +png_set_filter_heuristics_fixed(png_structrp png_ptr, int heuristic_method, int num_weights, png_const_fixed_point_p filter_weights, png_const_fixed_point_p filter_costs) { png_debug(1, "in png_set_filter_heuristics_fixed"); @@ -1392,154 +1287,151 @@ #endif /* FIXED_POINT */ #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ void PNGAPI -png_set_compression_level(png_structp png_ptr, int level) +png_set_compression_level(png_structrp png_ptr, int level) { png_debug(1, "in png_set_compression_level"); if (png_ptr == NULL) return; - png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL; png_ptr->zlib_level = level; } void PNGAPI -png_set_compression_mem_level(png_structp png_ptr, int mem_level) +png_set_compression_mem_level(png_structrp png_ptr, int mem_level) { png_debug(1, "in png_set_compression_mem_level"); if (png_ptr == NULL) return; - png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL; png_ptr->zlib_mem_level = mem_level; } void PNGAPI -png_set_compression_strategy(png_structp png_ptr, int strategy) +png_set_compression_strategy(png_structrp png_ptr, int strategy) { png_debug(1, "in png_set_compression_strategy"); if (png_ptr == NULL) return; + /* The flag setting here prevents the libpng dynamic selection of strategy. + */ png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY; png_ptr->zlib_strategy = strategy; } /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a * smaller value of window_bits if it can do so safely. */ void PNGAPI -png_set_compression_window_bits(png_structp png_ptr, int window_bits) +png_set_compression_window_bits(png_structrp png_ptr, int window_bits) { if (png_ptr == NULL) return; + /* Prior to 1.6.0 this would warn but then set the window_bits value, this + * meant that negative window bits values could be selected which would cause + * libpng to write a non-standard PNG file with raw deflate or gzip + * compressed IDAT or ancillary chunks. Such files can be read and there is + * no warning on read, so this seems like a very bad idea. + */ if (window_bits > 15) + { png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); + window_bits = 15; + } else if (window_bits < 8) - png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); - -#ifndef WBITS_8_OK - /* Avoid libpng bug with 256-byte windows */ - if (window_bits == 8) { - png_warning(png_ptr, "Compression window is being reset to 512"); - window_bits = 9; + png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); + window_bits = 8; } -#endif - png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS; png_ptr->zlib_window_bits = window_bits; } void PNGAPI -png_set_compression_method(png_structp png_ptr, int method) +png_set_compression_method(png_structrp png_ptr, int method) { png_debug(1, "in png_set_compression_method"); if (png_ptr == NULL) return; + /* This would produce an invalid PNG file if it worked, but it doesn't and + * deflate will fault it, so it is harmless to just warn here. + */ if (method != 8) png_warning(png_ptr, "Only compression method 8 is supported by PNG"); - png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD; png_ptr->zlib_method = method; } /* The following were added to libpng-1.5.4 */ #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED void PNGAPI -png_set_text_compression_level(png_structp png_ptr, int level) +png_set_text_compression_level(png_structrp png_ptr, int level) { png_debug(1, "in png_set_text_compression_level"); if (png_ptr == NULL) return; - png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_LEVEL; png_ptr->zlib_text_level = level; } void PNGAPI -png_set_text_compression_mem_level(png_structp png_ptr, int mem_level) +png_set_text_compression_mem_level(png_structrp png_ptr, int mem_level) { png_debug(1, "in png_set_text_compression_mem_level"); if (png_ptr == NULL) return; - png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL; png_ptr->zlib_text_mem_level = mem_level; } void PNGAPI -png_set_text_compression_strategy(png_structp png_ptr, int strategy) +png_set_text_compression_strategy(png_structrp png_ptr, int strategy) { png_debug(1, "in png_set_text_compression_strategy"); if (png_ptr == NULL) return; - png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_STRATEGY; png_ptr->zlib_text_strategy = strategy; } /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a * smaller value of window_bits if it can do so safely. */ void PNGAPI -png_set_text_compression_window_bits(png_structp png_ptr, int window_bits) +png_set_text_compression_window_bits(png_structrp png_ptr, int window_bits) { if (png_ptr == NULL) return; if (window_bits > 15) + { png_warning(png_ptr, "Only compression windows <= 32k supported by PNG"); + window_bits = 15; + } else if (window_bits < 8) - png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); - -#ifndef WBITS_8_OK - /* Avoid libpng bug with 256-byte windows */ - if (window_bits == 8) { - png_warning(png_ptr, "Text compression window is being reset to 512"); - window_bits = 9; + png_warning(png_ptr, "Only compression windows >= 256 supported by PNG"); + window_bits = 8; } -#endif - png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS; png_ptr->zlib_text_window_bits = window_bits; } void PNGAPI -png_set_text_compression_method(png_structp png_ptr, int method) +png_set_text_compression_method(png_structrp png_ptr, int method) { png_debug(1, "in png_set_text_compression_method"); if (png_ptr == NULL) @@ -1547,16 +1439,15 @@ if (method != 8) png_warning(png_ptr, "Only compression method 8 is supported by PNG"); - png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_METHOD; png_ptr->zlib_text_method = method; } #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ /* end of API added to libpng-1.5.4 */ void PNGAPI -png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn) +png_set_write_status_fn(png_structrp png_ptr, png_write_status_ptr write_row_fn) { if (png_ptr == NULL) return; @@ -1564,9 +1455,9 @@ } #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED void PNGAPI -png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr +png_set_write_user_transform_fn(png_structrp png_ptr, png_user_transform_ptr write_user_transform_fn) { png_debug(1, "in png_set_write_user_transform_fn"); @@ -1580,9 +1471,9 @@ #ifdef PNG_INFO_IMAGE_SUPPORTED void PNGAPI -png_write_png(png_structp png_ptr, png_infop info_ptr, +png_write_png(png_structrp png_ptr, png_inforp info_ptr, int transforms, voidp params) { if (png_ptr == NULL || info_ptr == NULL) return; @@ -1664,5 +1555,773 @@ PNG_UNUSED(transforms) /* Quiet compiler warnings */ PNG_UNUSED(params) } #endif + + +#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED +#ifdef PNG_STDIO_SUPPORTED /* currently required for png_image_write_* */ +/* Initialize the write structure - general purpose utility. */ +static int +png_image_write_init(png_imagep image) +{ + png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, image, + png_safe_error, png_safe_warning); + + if (png_ptr != NULL) + { + png_infop info_ptr = png_create_info_struct(png_ptr); + + if (info_ptr != NULL) + { + png_controlp control = png_voidcast(png_controlp, + png_malloc_warn(png_ptr, (sizeof *control))); + + if (control != NULL) + { + memset(control, 0, (sizeof *control)); + + control->png_ptr = png_ptr; + control->info_ptr = info_ptr; + control->for_write = 1; + + image->opaque = control; + return 1; + } + + /* Error clean up */ + png_destroy_info_struct(png_ptr, &info_ptr); + } + + png_destroy_write_struct(&png_ptr, NULL); + } + + return png_image_error(image, "png_image_write_: out of memory"); +} + +/* Arguments to png_image_write_main: */ +typedef struct +{ + /* Arguments: */ + png_imagep image; + png_const_voidp buffer; + png_int_32 row_stride; + png_const_voidp colormap; + int convert_to_8bit; + /* Local variables: */ + png_const_voidp first_row; + ptrdiff_t row_bytes; + png_voidp local_row; +} png_image_write_control; + +/* Write png_uint_16 input to a 16-bit PNG; the png_ptr has already been set to + * do any necessary byte swapping. The component order is defined by the + * png_image format value. + */ +static int +png_write_image_16bit(png_voidp argument) +{ + png_image_write_control *display = png_voidcast(png_image_write_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + + png_const_uint_16p input_row = png_voidcast(png_const_uint_16p, + display->first_row); + png_uint_16p output_row = png_voidcast(png_uint_16p, display->local_row); + png_uint_16p row_end; + const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) ? 3 : 1; + int aindex = 0; + png_uint_32 y = image->height; + + if (image->format & PNG_FORMAT_FLAG_ALPHA) + { + if (image->format & PNG_FORMAT_FLAG_AFIRST) + { + aindex = -1; + ++input_row; /* To point to the first component */ + ++output_row; + } + + else + aindex = channels; + } + + else + png_error(png_ptr, "png_write_image: internal call error"); + + /* Work out the output row end and count over this, note that the increment + * above to 'row' means that row_end can actually be beyond the end of the + * row; this is correct. + */ + row_end = output_row + image->width * (channels+1); + + while (y-- > 0) + { + png_const_uint_16p in_ptr = input_row; + png_uint_16p out_ptr = output_row; + + while (out_ptr < row_end) + { + const png_uint_16 alpha = in_ptr[aindex]; + png_uint_32 reciprocal = 0; + int c; + + out_ptr[aindex] = alpha; + + /* Calculate a reciprocal. The correct calculation is simply + * component/alpha*65535 << 15. (I.e. 15 bits of precision); this + * allows correct rounding by adding .5 before the shift. 'reciprocal' + * is only initialized when required. + */ + if (alpha > 0 && alpha < 65535) + reciprocal = ((0xffff<<15)+(alpha>>1))/alpha; + + c = channels; + do /* always at least one channel */ + { + png_uint_16 component = *in_ptr++; + + /* The following gives 65535 for an alpha of 0, which is fine, + * otherwise if 0/0 is represented as some other value there is more + * likely to be a discontinuity which will probably damage + * compression when moving from a fully transparent area to a + * nearly transparent one. (The assumption here is that opaque + * areas tend not to be 0 intensity.) + */ + if (component >= alpha) + component = 65535; + + /* component 0 && alpha < 65535) + { + png_uint_32 calc = component * reciprocal; + calc += 16384; /* round to nearest */ + component = (png_uint_16)(calc >> 15); + } + + *out_ptr++ = component; + } + while (--c > 0); + + /* Skip to next component (skip the intervening alpha channel) */ + ++in_ptr; + ++out_ptr; + } + + png_write_row(png_ptr, png_voidcast(png_const_bytep, display->local_row)); + input_row += display->row_bytes/(sizeof (png_uint_16)); + } + + return 1; +} + +/* Given 16-bit input (1 to 4 channels) write 8-bit output. If an alpha channel + * is present it must be removed from the components, the components are then + * written in sRGB encoding. No components are added or removed. + * + * Calculate an alpha reciprocal to reverse pre-multiplication. As above the + * calculation can be done to 15 bits of accuracy; however, the output needs to + * be scaled in the range 0..255*65535, so include that scaling here. + */ +#define UNP_RECIPROCAL(alpha) ((((0xffff*0xff)<<7)+(alpha>>1))/alpha) + +static png_byte +png_unpremultiply(png_uint_32 component, png_uint_32 alpha, + png_uint_32 reciprocal/*from the above macro*/) +{ + /* The following gives 1.0 for an alpha of 0, which is fine, otherwise if 0/0 + * is represented as some other value there is more likely to be a + * discontinuity which will probably damage compression when moving from a + * fully transparent area to a nearly transparent one. (The assumption here + * is that opaque areas tend not to be 0 intensity.) + * + * There is a rounding problem here; if alpha is less than 128 it will end up + * as 0 when scaled to 8 bits. To avoid introducing spurious colors into the + * output change for this too. + */ + if (component >= alpha || alpha < 128) + return 255; + + /* component 0) + { + /* The test is that alpha/257 (rounded) is less than 255, the first value + * that becomes 255 is 65407. + * NOTE: this must agree with the PNG_DIV257 macro (which must, therefore, + * be exact!) [Could also test reciprocal != 0] + */ + if (alpha < 65407) + { + component *= reciprocal; + component += 64; /* round to nearest */ + component >>= 7; + } + + else + component *= 255; + + /* Convert the component to sRGB. */ + return (png_byte)PNG_sRGB_FROM_LINEAR(component); + } + + else + return 0; +} + +static int +png_write_image_8bit(png_voidp argument) +{ + png_image_write_control *display = png_voidcast(png_image_write_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + + png_const_uint_16p input_row = png_voidcast(png_const_uint_16p, + display->first_row); + png_bytep output_row = png_voidcast(png_bytep, display->local_row); + png_uint_32 y = image->height; + const int channels = (image->format & PNG_FORMAT_FLAG_COLOR) ? 3 : 1; + + if (image->format & PNG_FORMAT_FLAG_ALPHA) + { + png_bytep row_end; + int aindex; + + if (image->format & PNG_FORMAT_FLAG_AFIRST) + { + aindex = -1; + ++input_row; /* To point to the first component */ + ++output_row; + } + + else + aindex = channels; + + /* Use row_end in place of a loop counter: */ + row_end = output_row + image->width * (channels+1); + + while (y-- > 0) + { + png_const_uint_16p in_ptr = input_row; + png_bytep out_ptr = output_row; + + while (out_ptr < row_end) + { + png_uint_16 alpha = in_ptr[aindex]; + png_byte alphabyte = (png_byte)PNG_DIV257(alpha); + png_uint_32 reciprocal = 0; + int c; + + /* Scale and write the alpha channel. */ + out_ptr[aindex] = alphabyte; + + if (alphabyte > 0 && alphabyte < 255) + reciprocal = UNP_RECIPROCAL(alpha); + + c = channels; + do /* always at least one channel */ + *out_ptr++ = png_unpremultiply(*in_ptr++, alpha, reciprocal); + while (--c > 0); + + /* Skip to next component (skip the intervening alpha channel) */ + ++in_ptr; + ++out_ptr; + } /* while out_ptr < row_end */ + + png_write_row(png_ptr, png_voidcast(png_const_bytep, + display->local_row)); + input_row += display->row_bytes/(sizeof (png_uint_16)); + } /* while y */ + } + + else + { + /* No alpha channel, so the row_end really is the end of the row and it + * is sufficient to loop over the components one by one. + */ + png_bytep row_end = output_row + image->width * channels; + + while (y-- > 0) + { + png_const_uint_16p in_ptr = input_row; + png_bytep out_ptr = output_row; + + while (out_ptr < row_end) + { + png_uint_32 component = *in_ptr++; + + component *= 255; + *out_ptr++ = (png_byte)PNG_sRGB_FROM_LINEAR(component); + } + + png_write_row(png_ptr, output_row); + input_row += display->row_bytes/(sizeof (png_uint_16)); + } + } + + return 1; +} + +static void +png_image_set_PLTE(png_image_write_control *display) +{ + const png_imagep image = display->image; + const void *cmap = display->colormap; + const int entries = image->colormap_entries > 256 ? 256 : + (int)image->colormap_entries; + + /* NOTE: the caller must check for cmap != NULL and entries != 0 */ + const png_uint_32 format = image->format; + const int channels = PNG_IMAGE_SAMPLE_CHANNELS(format); + +# ifdef PNG_FORMAT_BGR_SUPPORTED + const int afirst = (format & PNG_FORMAT_FLAG_AFIRST) != 0 && + (format & PNG_FORMAT_FLAG_ALPHA) != 0; +# else +# define afirst 0 +# endif + +# ifdef PNG_FORMAT_BGR_SUPPORTED + const int bgr = (format & PNG_FORMAT_FLAG_BGR) ? 2 : 0; +# else +# define bgr 0 +# endif + + int i, num_trans; + png_color palette[256]; + png_byte tRNS[256]; + + memset(tRNS, 255, (sizeof tRNS)); + memset(palette, 0, (sizeof palette)); + + for (i=num_trans=0; i= 3) /* RGB */ + { + palette[i].blue = (png_byte)PNG_sRGB_FROM_LINEAR(255 * + entry[(2 ^ bgr)]); + palette[i].green = (png_byte)PNG_sRGB_FROM_LINEAR(255 * + entry[1]); + palette[i].red = (png_byte)PNG_sRGB_FROM_LINEAR(255 * + entry[bgr]); + } + + else /* Gray */ + palette[i].blue = palette[i].red = palette[i].green = + (png_byte)PNG_sRGB_FROM_LINEAR(255 * *entry); + } + + else /* alpha */ + { + png_uint_16 alpha = entry[afirst ? 0 : channels-1]; + png_byte alphabyte = (png_byte)PNG_DIV257(alpha); + png_uint_32 reciprocal = 0; + + /* Calculate a reciprocal, as in the png_write_image_8bit code above + * this is designed to produce a value scaled to 255*65535 when + * divided by 128 (i.e. asr 7). + */ + if (alphabyte > 0 && alphabyte < 255) + reciprocal = (((0xffff*0xff)<<7)+(alpha>>1))/alpha; + + tRNS[i] = alphabyte; + if (alphabyte < 255) + num_trans = i+1; + + if (channels >= 3) /* RGB */ + { + palette[i].blue = png_unpremultiply(entry[afirst + (2 ^ bgr)], + alpha, reciprocal); + palette[i].green = png_unpremultiply(entry[afirst + 1], alpha, + reciprocal); + palette[i].red = png_unpremultiply(entry[afirst + bgr], alpha, + reciprocal); + } + + else /* gray */ + palette[i].blue = palette[i].red = palette[i].green = + png_unpremultiply(entry[afirst], alpha, reciprocal); + } + } + + else /* Color-map has sRGB values */ + { + png_const_bytep entry = png_voidcast(png_const_bytep, cmap); + + entry += i * channels; + + switch (channels) + { + case 4: + tRNS[i] = entry[afirst ? 0 : 3]; + if (tRNS[i] < 255) + num_trans = i+1; + /* FALL THROUGH */ + case 3: + palette[i].blue = entry[afirst + (2 ^ bgr)]; + palette[i].green = entry[afirst + 1]; + palette[i].red = entry[afirst + bgr]; + break; + + case 2: + tRNS[i] = entry[1 ^ afirst]; + if (tRNS[i] < 255) + num_trans = i+1; + /* FALL THROUGH */ + case 1: + palette[i].blue = palette[i].red = palette[i].green = + entry[afirst]; + break; + + default: + break; + } + } + } + +# ifdef afirst +# undef afirst +# endif +# ifdef bgr +# undef bgr +# endif + + png_set_PLTE(image->opaque->png_ptr, image->opaque->info_ptr, palette, + entries); + + if (num_trans > 0) + png_set_tRNS(image->opaque->png_ptr, image->opaque->info_ptr, tRNS, + num_trans, NULL); + + image->colormap_entries = entries; +} + +static int +png_image_write_main(png_voidp argument) +{ + png_image_write_control *display = png_voidcast(png_image_write_control*, + argument); + png_imagep image = display->image; + png_structrp png_ptr = image->opaque->png_ptr; + png_inforp info_ptr = image->opaque->info_ptr; + png_uint_32 format = image->format; + + int colormap = (format & PNG_FORMAT_FLAG_COLORMAP) != 0; + int linear = !colormap && (format & PNG_FORMAT_FLAG_LINEAR) != 0; /* input */ + int alpha = !colormap && (format & PNG_FORMAT_FLAG_ALPHA) != 0; + int write_16bit = linear && !colormap && !display->convert_to_8bit; + +# ifdef PNG_BENIGN_ERRORS_SUPPORTED + /* Make sure we error out on any bad situation */ + png_set_benign_errors(png_ptr, 0/*error*/); +# endif + + /* Default the 'row_stride' parameter if required. */ + if (display->row_stride == 0) + display->row_stride = PNG_IMAGE_ROW_STRIDE(*image); + + /* Set the required transforms then write the rows in the correct order. */ + if (format & PNG_FORMAT_FLAG_COLORMAP) + { + if (display->colormap != NULL && image->colormap_entries > 0) + { + png_uint_32 entries = image->colormap_entries; + + png_set_IHDR(png_ptr, info_ptr, image->width, image->height, + entries > 16 ? 8 : (entries > 4 ? 4 : (entries > 2 ? 2 : 1)), + PNG_COLOR_TYPE_PALETTE, PNG_INTERLACE_NONE, + PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); + + png_image_set_PLTE(display); + } + + else + png_error(image->opaque->png_ptr, + "no color-map for color-mapped image"); + } + + else + png_set_IHDR(png_ptr, info_ptr, image->width, image->height, + write_16bit ? 16 : 8, + ((format & PNG_FORMAT_FLAG_COLOR) ? PNG_COLOR_MASK_COLOR : 0) + + ((format & PNG_FORMAT_FLAG_ALPHA) ? PNG_COLOR_MASK_ALPHA : 0), + PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); + + /* Counter-intuitively the data transformations must be called *after* + * png_write_info, not before as in the read code, but the 'set' functions + * must still be called before. Just set the color space information, never + * write an interlaced image. + */ + + if (write_16bit) + { + /* The gamma here is 1.0 (linear) and the cHRM chunk matches sRGB. */ + png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_LINEAR); + + if (!(image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB)) + png_set_cHRM_fixed(png_ptr, info_ptr, + /* color x y */ + /* white */ 31270, 32900, + /* red */ 64000, 33000, + /* green */ 30000, 60000, + /* blue */ 15000, 6000 + ); + } + + else if (!(image->flags & PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB)) + png_set_sRGB(png_ptr, info_ptr, PNG_sRGB_INTENT_PERCEPTUAL); + + /* Else writing an 8-bit file and the *colors* aren't sRGB, but the 8-bit + * space must still be gamma encoded. + */ + else + png_set_gAMA_fixed(png_ptr, info_ptr, PNG_GAMMA_sRGB_INVERSE); + + /* Write the file header. */ + png_write_info(png_ptr, info_ptr); + + /* Now set up the data transformations (*after* the header is written), + * remove the handled transformations from the 'format' flags for checking. + * + * First check for a little endian system if writing 16 bit files. + */ + if (write_16bit) + { + PNG_CONST png_uint_16 le = 0x0001; + + if (*(png_const_bytep)&le) + png_set_swap(png_ptr); + } + +# ifdef PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED + if (format & PNG_FORMAT_FLAG_BGR) + { + if (!colormap && (format & PNG_FORMAT_FLAG_COLOR) != 0) + png_set_bgr(png_ptr); + format &= ~PNG_FORMAT_FLAG_BGR; + } +# endif + +# ifdef PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED + if (format & PNG_FORMAT_FLAG_AFIRST) + { + if (!colormap && (format & PNG_FORMAT_FLAG_ALPHA) != 0) + png_set_swap_alpha(png_ptr); + format &= ~PNG_FORMAT_FLAG_AFIRST; + } +# endif + + /* If there are 16 or fewer color-map entries we wrote a lower bit depth + * above, but the application data is still byte packed. + */ + if (colormap && image->colormap_entries <= 16) + png_set_packing(png_ptr); + + /* That should have handled all (both) the transforms. */ + if ((format & ~(png_uint_32)(PNG_FORMAT_FLAG_COLOR | PNG_FORMAT_FLAG_LINEAR | + PNG_FORMAT_FLAG_ALPHA | PNG_FORMAT_FLAG_COLORMAP)) != 0) + png_error(png_ptr, "png_write_image: unsupported transformation"); + + { + png_const_bytep row = png_voidcast(png_const_bytep, display->buffer); + ptrdiff_t row_bytes = display->row_stride; + + if (linear) + row_bytes *= (sizeof (png_uint_16)); + + if (row_bytes < 0) + row += (image->height-1) * (-row_bytes); + + display->first_row = row; + display->row_bytes = row_bytes; + } + + /* Apply 'fast' options if the flag is set. */ + if ((image->flags & PNG_IMAGE_FLAG_FAST) != 0) + { + png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_NO_FILTERS); + /* NOTE: determined by experiment using pngstest, this reflects some + * balance between the time to write the image once and the time to read + * it about 50 times. The speed-up in pngstest was about 10-20% of the + * total (user) time on a heavily loaded system. + */ + png_set_compression_level(png_ptr, 3); + } + + /* Check for the cases that currently require a pre-transform on the row + * before it is written. This only applies when the input is 16-bit and + * either there is an alpha channel or it is converted to 8-bit. + */ + if ((linear && alpha) || (!colormap && display->convert_to_8bit)) + { + png_bytep row = png_voidcast(png_bytep, png_malloc(png_ptr, + png_get_rowbytes(png_ptr, info_ptr))); + int result; + + display->local_row = row; + if (write_16bit) + result = png_safe_execute(image, png_write_image_16bit, display); + else + result = png_safe_execute(image, png_write_image_8bit, display); + display->local_row = NULL; + + png_free(png_ptr, row); + + /* Skip the 'write_end' on error: */ + if (!result) + return 0; + } + + /* Otherwise this is the case where the input is in a format currently + * supported by the rest of the libpng write code; call it directly. + */ + else + { + png_const_bytep row = png_voidcast(png_const_bytep, display->first_row); + ptrdiff_t row_bytes = display->row_bytes; + png_uint_32 y = image->height; + + while (y-- > 0) + { + png_write_row(png_ptr, row); + row += row_bytes; + } + } + + png_write_end(png_ptr, info_ptr); + return 1; +} + +int PNGAPI +png_image_write_to_stdio(png_imagep image, FILE *file, int convert_to_8bit, + const void *buffer, png_int_32 row_stride, const void *colormap) +{ + /* Write the image to the given (FILE*). */ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (file != NULL) + { + if (png_image_write_init(image)) + { + png_image_write_control display; + int result; + + /* This is slightly evil, but png_init_io doesn't do anything other + * than this and we haven't changed the standard IO functions so + * this saves a 'safe' function. + */ + image->opaque->png_ptr->io_ptr = file; + + memset(&display, 0, (sizeof display)); + display.image = image; + display.buffer = buffer; + display.row_stride = row_stride; + display.colormap = colormap; + display.convert_to_8bit = convert_to_8bit; + + result = png_safe_execute(image, png_image_write_main, &display); + png_image_free(image); + return result; + } + + else + return 0; + } + + else + return png_image_error(image, + "png_image_write_to_stdio: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_write_to_stdio: incorrect PNG_IMAGE_VERSION"); + + else + return 0; +} + +int PNGAPI +png_image_write_to_file(png_imagep image, const char *file_name, + int convert_to_8bit, const void *buffer, png_int_32 row_stride, + const void *colormap) +{ + /* Write the image to the named file. */ + if (image != NULL && image->version == PNG_IMAGE_VERSION) + { + if (file_name != NULL) + { + FILE *fp = fopen(file_name, "wb"); + + if (fp != NULL) + { + if (png_image_write_to_stdio(image, fp, convert_to_8bit, buffer, + row_stride, colormap)) + { + int error; /* from fflush/fclose */ + + /* Make sure the file is flushed correctly. */ + if (fflush(fp) == 0 && ferror(fp) == 0) + { + if (fclose(fp) == 0) + return 1; + + error = errno; /* from fclose */ + } + + else + { + error = errno; /* from fflush or ferror */ + (void)fclose(fp); + } + + (void)remove(file_name); + /* The image has already been cleaned up; this is just used to + * set the error (because the original write succeeded). + */ + return png_image_error(image, strerror(error)); + } + + else + { + /* Clean up: just the opened file. */ + (void)fclose(fp); + (void)remove(file_name); + return 0; + } + } + + else + return png_image_error(image, strerror(errno)); + } + + else + return png_image_error(image, + "png_image_write_to_file: invalid argument"); + } + + else if (image != NULL) + return png_image_error(image, + "png_image_write_to_file: incorrect PNG_IMAGE_VERSION"); + + else + return 0; +} +#endif /* PNG_STDIO_SUPPORTED */ +#endif /* SIMPLIFIED_WRITE */ #endif /* PNG_WRITE_SUPPORTED */ diff -ru4NwbB libpng-1.5.13/pngwtran.c libpng-1.6.0beta32/pngwtran.c --- libpng-1.5.13/pngwtran.c 2012-09-27 06:21:19.803085510 -0500 +++ libpng-1.6.0beta32/pngwtran.c 2012-11-25 12:40:10.183707157 -0600 @@ -1,8 +1,8 @@ /* pngwtran.c - transforms the data in a row for PNG writers * - * Last changed in libpng 1.5.13 [September 27, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -19,9 +19,9 @@ /* Transform the data according to the user's wishes. The order of * transformations is significant. */ void /* PRIVATE */ -png_do_write_transformations(png_structp png_ptr, png_row_infop row_info) +png_do_write_transformations(png_structrp png_ptr, png_row_infop row_info) { png_debug(1, "in png_do_write_transformations"); if (png_ptr == NULL) @@ -44,22 +44,10 @@ #endif #ifdef PNG_WRITE_FILLER_SUPPORTED if (png_ptr->transformations & PNG_FILLER) - { - if (png_ptr->color_type & (PNG_COLOR_MASK_ALPHA|PNG_COLOR_MASK_PALETTE)) - { - /* GA, RGBA or palette; in any of these cases libpng will not do the - * the correct thing (whatever that might be). - */ - png_warning(png_ptr, "incorrect png_set_filler call ignored"); - png_ptr->transformations &= ~PNG_FILLER; - } - - else png_do_strip_channel(row_info, png_ptr->row_buf + 1, !(png_ptr->flags & PNG_FLAG_FILLER_AFTER)); - } #endif #ifdef PNG_WRITE_PACKSWAP_SUPPORTED if (png_ptr->transformations & PNG_PACKSWAP) @@ -298,9 +286,9 @@ if (row_info->bit_depth < 8) { png_bytep bp = row; png_size_t i; - png_byte mask; + unsigned int mask; png_size_t row_bytes = row_info->rowbytes; if (bit_depth->gray == 1 && row_info->bit_depth == 2) mask = 0x55; @@ -312,22 +300,24 @@ mask = 0xff; for (i = 0; i < row_bytes; i++, bp++) { - png_uint_16 v; int j; + unsigned int v, out; v = *bp; - *bp = 0; + out = 0; for (j = shift_start[0]; j > -shift_dec[0]; j -= shift_dec[0]) { if (j > 0) - *bp |= (png_byte)((v << j) & 0xff); + out |= v << j; else - *bp |= (png_byte)((v >> (-j)) & mask); + out |= (v >> (-j)) & mask; } + + *bp = (png_byte)(out & 0xff); } } else if (row_info->bit_depth == 8) @@ -338,23 +328,25 @@ for (i = 0; i < istop; i++, bp++) { - png_uint_16 v; + const unsigned int c = i%channels; int j; - int c = (int)(i%channels); + unsigned int v, out; v = *bp; - *bp = 0; + out = 0; for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { if (j > 0) - *bp |= (png_byte)((v << j) & 0xff); + out |= v << j; else - *bp |= (png_byte)((v >> (-j)) & 0xff); + out |= v >> (-j); } + + *bp = (png_byte)(out & 0xff); } } else @@ -364,24 +356,24 @@ png_uint_32 istop = channels * row_info->width; for (bp = row, i = 0; i < istop; i++) { - int c = (int)(i%channels); - png_uint_16 value, v; + const unsigned int c = i%channels; int j; + unsigned int value, v; - v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1)); + v = png_get_uint_16(bp); value = 0; for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c]) { if (j > 0) - value |= (png_uint_16)((v << j) & (png_uint_16)0xffff); + value |= v << j; else - value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff); + value |= v >> (-j); } - *bp++ = (png_byte)(value >> 8); + *bp++ = (png_byte)((value >> 8) & 0xff); *bp++ = (png_byte)(value & 0xff); } } } diff -ru4NwbB libpng-1.5.13/pngwutil.c libpng-1.6.0beta32/pngwutil.c --- libpng-1.5.13/pngwutil.c 2012-09-27 06:21:19.816315135 -0500 +++ libpng-1.6.0beta32/pngwutil.c 2012-11-25 12:40:10.196847838 -0600 @@ -1,8 +1,8 @@ /* pngwutil.c - utilities to write a PNG file * - * Last changed in libpng 1.5.10 [March 8, 2012] + * Last changed in libpng 1.6.0 [(PENDING RELEASE)] * Copyright (c) 1998-2012 Glenn Randers-Pehrson * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) * @@ -28,25 +28,8 @@ buf[2] = (png_byte)((i >> 8) & 0xff); buf[3] = (png_byte)(i & 0xff); } -#ifdef PNG_SAVE_INT_32_SUPPORTED -/* The png_save_int_32 function assumes integers are stored in two's - * complement format. If this isn't the case, then this routine needs to - * be modified to write data in two's complement format. Note that, - * the following works correctly even if png_int_32 has more than 32 bits - * (compare the more complex code required on read for sign extention.) - */ -void PNGAPI -png_save_int_32(png_bytep buf, png_int_32 i) -{ - buf[0] = (png_byte)((i >> 24) & 0xff); - buf[1] = (png_byte)((i >> 16) & 0xff); - buf[2] = (png_byte)((i >> 8) & 0xff); - buf[3] = (png_byte)(i & 0xff); -} -#endif - /* Place a 16-bit number into a buffer in PNG byte order. * The parameter is declared unsigned int, not png_uint_16, * just to avoid potential problems on pre-ANSI C compilers. */ @@ -64,9 +47,9 @@ * we should call png_set_sig_bytes() to tell libpng how many of the * bytes have already been written. */ void PNGAPI -png_write_sig(png_structp png_ptr) +png_write_sig(png_structrp png_ptr) { png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10}; #ifdef PNG_IO_STATE_SUPPORTED @@ -86,9 +69,9 @@ * The total_length is the sum of the lengths of all the data you will be * passing in png_write_chunk_data(). */ static void -png_write_chunk_header(png_structp png_ptr, png_uint_32 chunk_name, +png_write_chunk_header(png_structrp png_ptr, png_uint_32 chunk_name, png_uint_32 length) { png_byte buf[8]; @@ -128,9 +111,9 @@ #endif } void PNGAPI -png_write_chunk_start(png_structp png_ptr, png_const_bytep chunk_string, +png_write_chunk_start(png_structrp png_ptr, png_const_bytep chunk_string, png_uint_32 length) { png_write_chunk_header(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), length); } @@ -140,9 +123,9 @@ * sum of the lengths from these calls *must* add up to the total_length * given to png_write_chunk_header(). */ void PNGAPI -png_write_chunk_data(png_structp png_ptr, png_const_bytep data, +png_write_chunk_data(png_structrp png_ptr, png_const_bytep data, png_size_t length) { /* Write the data, and run the CRC over it */ if (png_ptr == NULL) @@ -160,9 +143,9 @@ } /* Finish a chunk started with png_write_chunk_header(). */ void PNGAPI -png_write_chunk_end(png_structp png_ptr) +png_write_chunk_end(png_structrp png_ptr) { png_byte buf[4]; if (png_ptr == NULL) return; @@ -189,16 +172,16 @@ * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end() * functions instead. */ static void -png_write_complete_chunk(png_structp png_ptr, png_uint_32 chunk_name, +png_write_complete_chunk(png_structrp png_ptr, png_uint_32 chunk_name, png_const_bytep data, png_size_t length) { if (png_ptr == NULL) return; /* On 64 bit architectures 'length' may not fit in a png_uint_32. */ - if (length > PNG_UINT_32_MAX) + if (length > PNG_UINT_31_MAX) png_error(png_ptr, "length exceeds PNG maxima"); png_write_chunk_header(png_ptr, chunk_name, (png_uint_32)length); png_write_chunk_data(png_ptr, data, length); @@ -206,476 +189,570 @@ } /* This is the API that calls the internal function above. */ void PNGAPI -png_write_chunk(png_structp png_ptr, png_const_bytep chunk_string, +png_write_chunk(png_structrp png_ptr, png_const_bytep chunk_string, png_const_bytep data, png_size_t length) { png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data, length); } -/* Initialize the compressor for the appropriate type of compression. */ -static void -png_zlib_claim(png_structp png_ptr, png_uint_32 state) +/* This is used below to find the size of an image to pass to png_deflate_claim, + * so it only needs to be accurate if the size is less than 16384 bytes (the + * point at which a lower LZ window size can be used.) + */ +static png_alloc_size_t +png_image_size(png_structrp png_ptr) { - if (!(png_ptr->zlib_state & PNG_ZLIB_IN_USE)) + /* Only return sizes up to the maximum of a png_uint_32, do this by limiting + * the width and height used to 15 bits. + */ + png_uint_32 h = png_ptr->height; + + if (png_ptr->rowbytes < 32768 && h < 32768) { - /* If already initialized for 'state' do not re-init. */ - if (png_ptr->zlib_state != state) + if (png_ptr->interlaced) { - int ret = Z_OK; - png_const_charp who = "-"; + /* Interlacing makes the image larger because of the replication of + * both the filter byte and the padding to a byte boundary. + */ + png_uint_32 w = png_ptr->width; + unsigned int pd = png_ptr->pixel_depth; + png_alloc_size_t cb_base; + int pass; - /* If actually initialized for another state do a deflateEnd. */ - if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED) + for (cb_base=0, pass=0; pass<=6; ++pass) { - ret = deflateEnd(&png_ptr->zstream); - who = "end"; - png_ptr->zlib_state = PNG_ZLIB_UNINITIALIZED; + png_uint_32 pw = PNG_PASS_COLS(w, pass); + + if (pw > 0) + cb_base += (PNG_ROWBYTES(pd, pw)+1) * PNG_PASS_ROWS(h, pass); } - /* zlib itself detects an incomplete state on deflateEnd */ - if (ret == Z_OK) switch (state) - { -# ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED - case PNG_ZLIB_FOR_TEXT: - ret = deflateInit2(&png_ptr->zstream, - png_ptr->zlib_text_level, png_ptr->zlib_text_method, - png_ptr->zlib_text_window_bits, - png_ptr->zlib_text_mem_level, png_ptr->zlib_text_strategy); - who = "text"; - break; -# endif + return cb_base; + } - case PNG_ZLIB_FOR_IDAT: - ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level, - png_ptr->zlib_method, png_ptr->zlib_window_bits, - png_ptr->zlib_mem_level, png_ptr->zlib_strategy); - who = "IDAT"; - break; + else + return (png_ptr->rowbytes+1) * h; + } - default: - png_error(png_ptr, "invalid zlib state"); + else + return 0xffffffffU; } - if (ret == Z_OK) - png_ptr->zlib_state = state; +#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED + /* This is the code to hack the first two bytes of the deflate stream (the + * deflate header) to correct the windowBits value to match the actual data + * size. Note that the second argument is the *uncompressed* size but the + * first argument is the *compressed* data (and it must be deflate + * compressed.) + */ +static void +optimize_cmf(png_bytep data, png_alloc_size_t data_size) +{ + /* Optimize the CMF field in the zlib stream. The resultant zlib stream is + * still compliant to the stream specification. + */ + if (data_size <= 16384) /* else windowBits must be 15 */ + { + unsigned int z_cmf = data[0]; /* zlib compression method and flags */ - else /* an error in deflateEnd or deflateInit2 */ + if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) { - size_t pos = 0; - char msg[64]; + unsigned int z_cinfo; + unsigned int half_z_window_size; - pos = png_safecat(msg, sizeof msg, pos, - "zlib failed to initialize compressor ("); - pos = png_safecat(msg, sizeof msg, pos, who); + z_cinfo = z_cmf >> 4; + half_z_window_size = 1U << (z_cinfo + 7); - switch (ret) + if (data_size <= half_z_window_size) /* else no change */ { - case Z_VERSION_ERROR: - pos = png_safecat(msg, sizeof msg, pos, ") version error"); - break; + unsigned int tmp; - case Z_STREAM_ERROR: - pos = png_safecat(msg, sizeof msg, pos, ") stream error"); - break; + do + { + half_z_window_size >>= 1; + --z_cinfo; + } + while (z_cinfo > 0 && data_size <= half_z_window_size); - case Z_MEM_ERROR: - pos = png_safecat(msg, sizeof msg, pos, ") memory error"); - break; + z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); - default: - pos = png_safecat(msg, sizeof msg, pos, ") unknown error"); - break; + data[0] = (png_byte)z_cmf; + tmp = data[1] & 0xe0; + tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; + data[1] = (png_byte)tmp; + } } - - png_error(png_ptr, msg); } } +#else +# define optimize_cmf(dp,dl) ((void)0) +#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */ - /* Here on success, claim the zstream: */ - png_ptr->zlib_state |= PNG_ZLIB_IN_USE; +/* Initialize the compressor for the appropriate type of compression. */ +static int +png_deflate_claim(png_structrp png_ptr, png_uint_32 owner, + png_alloc_size_t data_size) +{ + if (png_ptr->zowner != 0) + { + char msg[64]; + + PNG_STRING_FROM_CHUNK(msg, owner); + msg[4] = ':'; + msg[5] = ' '; + PNG_STRING_FROM_CHUNK(msg+6, png_ptr->zowner); + /* So the message that results is " using zstream"; this is an + * internal error, but is very useful for debugging. i18n requirements + * are minimal. + */ + (void)png_safecat(msg, (sizeof msg), 10, " using zstream"); +# if PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC + png_warning(png_ptr, msg); + + /* Attempt sane error recovery */ + if (png_ptr->zowner == png_IDAT) /* don't steal from IDAT */ + { + png_ptr->zstream.msg = PNGZ_MSG_CAST("in use by IDAT"); + return Z_STREAM_ERROR; } - else - png_error(png_ptr, "zstream already in use (internal error)"); + png_ptr->zowner = 0; +# else + png_error(png_ptr, msg); +# endif } -/* The opposite: release the stream. It is also reset, this API will warn on - * error but will not fail. - */ -static void -png_zlib_release(png_structp png_ptr) { - if (png_ptr->zlib_state & PNG_ZLIB_IN_USE) + int level = png_ptr->zlib_level; + int method = png_ptr->zlib_method; + int windowBits = png_ptr->zlib_window_bits; + int memLevel = png_ptr->zlib_mem_level; + int strategy; /* set below */ + int ret; /* zlib return code */ + + if (owner == png_IDAT) { - int ret = deflateReset(&png_ptr->zstream); + if (png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY) + strategy = png_ptr->zlib_strategy; - png_ptr->zlib_state &= ~PNG_ZLIB_IN_USE; + else if (png_ptr->do_filter != PNG_FILTER_NONE) + strategy = Z_FILTERED; - if (ret != Z_OK) + else + strategy = Z_DEFAULT_STRATEGY; + } + + else { - png_const_charp err; - PNG_WARNING_PARAMETERS(p) +# ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED + level = png_ptr->zlib_text_level; + method = png_ptr->zlib_text_method; + windowBits = png_ptr->zlib_text_window_bits; + memLevel = png_ptr->zlib_text_mem_level; + strategy = png_ptr->zlib_text_strategy; +# else + /* If customization is not supported the values all come from the + * IDAT values except for the strategy, which is fixed to the + * default. (This is the pre-1.6.0 behavior too, although it was + * implemented in a very different way.) + */ + strategy = Z_DEFAULT_STRATEGY; +# endif + } - switch (ret) + /* Adjust 'windowBits' down if larger than 'data_size'; to stop this + * happening just pass 32768 as the data_size parameter. Notice that zlib + * requires an extra 262 bytes in the window in addition to the data to be + * able to see the whole of the data, so if data_size+262 takes us to the + * next windowBits size we need to fix up the value later. (Because even + * though deflate needs the extra window, inflate does not!) + */ + if (data_size <= 16384) { - case Z_VERSION_ERROR: - err = "version"; - break; + /* IMPLEMENTATION NOTE: this 'half_window_size' stuff is only here to + * work round a Microsoft Visual C misbehavior which, contrary to C-90, + * widens the result of the following shift to 64-bits if (and, + * apparently, only if) it is used in a test. + */ + unsigned int half_window_size = 1U << (windowBits-1); - case Z_STREAM_ERROR: - err = "stream"; - break; + while (data_size + 262 <= half_window_size) + { + half_window_size >>= 1; + --windowBits; + } + } - case Z_MEM_ERROR: - err = "memory"; - break; + /* Check against the previous initialized values, if any. */ + if ((png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) && + (png_ptr->zlib_set_level != level || + png_ptr->zlib_set_method != method || + png_ptr->zlib_set_window_bits != windowBits || + png_ptr->zlib_set_mem_level != memLevel || + png_ptr->zlib_set_strategy != strategy)) + { + if (deflateEnd(&png_ptr->zstream) != Z_OK) + png_warning(png_ptr, "deflateEnd failed (ignored)"); - default: - err = "unknown"; - break; + png_ptr->flags &= ~PNG_FLAG_ZSTREAM_INITIALIZED; } - png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d, ret); - png_warning_parameter(p, 2, err); + /* For safety clear out the input and output pointers (currently zlib + * doesn't use them on Init, but it might in the future). + */ + png_ptr->zstream.next_in = NULL; + png_ptr->zstream.avail_in = 0; + png_ptr->zstream.next_out = NULL; + png_ptr->zstream.avail_out = 0; + + /* Now initialize if required, setting the new parameters, otherwise just + * to a simple reset to the previous parameters. + */ + if (png_ptr->flags & PNG_FLAG_ZSTREAM_INITIALIZED) + ret = deflateReset(&png_ptr->zstream); - if (png_ptr->zstream.msg) - err = png_ptr->zstream.msg; else - err = "[no zlib message]"; + { + ret = deflateInit2(&png_ptr->zstream, level, method, windowBits, + memLevel, strategy); + + if (ret == Z_OK) + png_ptr->flags |= PNG_FLAG_ZSTREAM_INITIALIZED; + } - png_warning_parameter(p, 3, err); + /* The return code is from either deflateReset or deflateInit2; they have + * pretty much the same set of error codes. + */ + if (ret == Z_OK) + png_ptr->zowner = owner; - png_formatted_warning(png_ptr, p, - "zlib failed to reset compressor: @1(@2): @3"); + else + png_zstream_error(png_ptr, ret); + + return ret; } } - else - png_warning(png_ptr, "zstream not in use (internal error)"); +/* Clean up (or trim) a linked list of compression buffers. */ +void /* PRIVATE */ +png_free_buffer_list(png_structrp png_ptr, png_compression_bufferp *listp) +{ + png_compression_bufferp list = *listp; + + if (list != NULL) + { + *listp = NULL; + + do + { + png_compression_bufferp next = list->next; + + png_free(png_ptr, list); + list = next; + } + while (list != NULL); + } } #ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED /* This pair of functions encapsulates the operation of (a) compressing a * text string, and (b) issuing it later as a series of chunk data writes. * The compression_state structure is shared context for these functions - * set up by the caller in order to make the whole mess thread-safe. + * set up by the caller to allow access to the relevant local variables. + * + * compression_buffer (new in 1.6.0) is just a linked list of zbuffer_size + * temporary buffers. From 1.6.0 it is retained in png_struct so that it will + * be correctly freed in the event of a write error (previous implementations + * just leaked memory.) */ - typedef struct { png_const_bytep input; /* The uncompressed input data */ - png_size_t input_len; /* Its length */ - int num_output_ptr; /* Number of output pointers used */ - int max_output_ptr; /* Size of output_ptr */ - png_bytep *output_ptr; /* Array of pointers to output */ + png_alloc_size_t input_len; /* Its length */ + png_uint_32 output_len; /* Final compressed length */ + png_byte output[1024]; /* First block of output */ } compression_state; -/* Compress given text into storage in the png_ptr structure */ -static int /* PRIVATE */ -png_text_compress(png_structp png_ptr, - png_const_charp text, png_size_t text_len, int compression, - compression_state *comp) -{ - int ret; - - comp->num_output_ptr = 0; - comp->max_output_ptr = 0; - comp->output_ptr = NULL; - comp->input = NULL; - comp->input_len = text_len; - - /* We may just want to pass the text right through */ - if (compression == PNG_TEXT_COMPRESSION_NONE) +static void +png_text_compress_init(compression_state *comp, png_const_bytep input, + png_alloc_size_t input_len) { - comp->input = (png_const_bytep)text; - return((int)text_len); + comp->input = input; + comp->input_len = input_len; + comp->output_len = 0; } - if (compression >= PNG_TEXT_COMPRESSION_LAST) +/* Compress the data in the compression state input */ +static int +png_text_compress(png_structrp png_ptr, png_uint_32 chunk_name, + compression_state *comp, png_uint_32 prefix_len) { - PNG_WARNING_PARAMETERS(p) - - png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d, - compression); - png_formatted_warning(png_ptr, p, "Unknown compression type @1"); - } + int ret; - /* We can't write the chunk until we find out how much data we have, - * which means we need to run the compressor first and save the - * output. This shouldn't be a problem, as the vast majority of - * comments should be reasonable, but we will set up an array of - * malloc'd pointers to be sure. + /* To find the length of the output it is necessary to first compress the + * input, the result is buffered rather than using the two-pass algorithm + * that is used on the inflate side; deflate is assumed to be slower and a + * PNG writer is assumed to have more memory available than a PNG reader. * - * If we knew the application was well behaved, we could simplify this - * greatly by assuming we can always malloc an output buffer large - * enough to hold the compressed text ((1001 * text_len / 1000) + 12) - * and malloc this directly. The only time this would be a bad idea is - * if we can't malloc more than 64K and we have 64K of random input - * data, or if the input string is incredibly large (although this - * wouldn't cause a failure, just a slowdown due to swapping). - */ - png_zlib_claim(png_ptr, PNG_ZLIB_FOR_TEXT); - - /* Set up the compression buffers */ - /* TODO: the following cast hides a potential overflow problem. */ - png_ptr->zstream.avail_in = (uInt)text_len; - - /* NOTE: assume zlib doesn't overwrite the input */ - png_ptr->zstream.next_in = (Bytef *)text; - png_ptr->zstream.avail_out = png_ptr->zbuf_size; - png_ptr->zstream.next_out = png_ptr->zbuf; - - /* This is the same compression loop as in png_write_row() */ - do - { - /* Compress the data */ - ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); + * IMPLEMENTATION NOTE: the zlib API deflateBound() can be used to find an + * upper limit on the output size, but it is always bigger than the input + * size so it is likely to be more efficient to use this linked-list + * approach. + */ + ret = png_deflate_claim(png_ptr, chunk_name, comp->input_len); if (ret != Z_OK) - { - /* Error */ - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); + return ret; - else - png_error(png_ptr, "zlib error"); - } + /* Set up the compression buffers, we need a loop here to avoid overflowing a + * uInt. Use ZLIB_IO_MAX to limit the input. The output is always limited + * by the output buffer size, so there is no need to check that. Since this + * is ANSI-C we know that an 'int', hence a uInt, is always at least 16 bits + * in size. + */ + { + png_compression_bufferp *end = &png_ptr->zbuffer_list; + png_alloc_size_t input_len = comp->input_len; /* may be zero! */ + png_uint_32 output_len; + + /* zlib updates these for us: */ + png_ptr->zstream.next_in = PNGZ_INPUT_CAST(comp->input); + png_ptr->zstream.avail_in = 0; /* Set below */ + png_ptr->zstream.next_out = comp->output; + png_ptr->zstream.avail_out = (sizeof comp->output); - /* Check to see if we need more room */ - if (!(png_ptr->zstream.avail_out)) - { - /* Make sure the output array has room */ - if (comp->num_output_ptr >= comp->max_output_ptr) - { - int old_max; + output_len = png_ptr->zstream.avail_out; - old_max = comp->max_output_ptr; - comp->max_output_ptr = comp->num_output_ptr + 4; - if (comp->output_ptr != NULL) + do { - png_bytepp old_ptr; + uInt avail_in = ZLIB_IO_MAX; - old_ptr = comp->output_ptr; + if (avail_in > input_len) + avail_in = (uInt)input_len; - comp->output_ptr = (png_bytepp)png_malloc(png_ptr, - (png_alloc_size_t) - (comp->max_output_ptr * png_sizeof(png_charpp))); + input_len -= avail_in; - png_memcpy(comp->output_ptr, old_ptr, old_max - * png_sizeof(png_charp)); + png_ptr->zstream.avail_in = avail_in; - png_free(png_ptr, old_ptr); - } - else - comp->output_ptr = (png_bytepp)png_malloc(png_ptr, - (png_alloc_size_t) - (comp->max_output_ptr * png_sizeof(png_charp))); - } - - /* Save the data */ - comp->output_ptr[comp->num_output_ptr] = - (png_bytep)png_malloc(png_ptr, - (png_alloc_size_t)png_ptr->zbuf_size); - - png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, - png_ptr->zbuf_size); - - comp->num_output_ptr++; + if (png_ptr->zstream.avail_out == 0) + { + png_compression_buffer *next; - /* and reset the buffer */ - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_out = png_ptr->zbuf; + /* Chunk data is limited to 2^31 bytes in length, so the prefix + * length must be counted here. + */ + if (output_len + prefix_len > PNG_UINT_31_MAX) + { + ret = Z_MEM_ERROR; + break; } - /* Continue until we don't have any more to compress */ - } while (png_ptr->zstream.avail_in); - /* Finish the compression */ - do + /* Need a new (malloc'ed) buffer, but there may be one present + * already. + */ + next = *end; + if (next == NULL) { - /* Tell zlib we are finished */ - ret = deflate(&png_ptr->zstream, Z_FINISH); + next = png_voidcast(png_compression_bufferp, png_malloc_base + (png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); - if (ret == Z_OK) - { - /* Check to see if we need more room */ - if (!(png_ptr->zstream.avail_out)) - { - /* Check to make sure our output array has room */ - if (comp->num_output_ptr >= comp->max_output_ptr) + if (next == NULL) { - int old_max; + ret = Z_MEM_ERROR; + break; + } - old_max = comp->max_output_ptr; - comp->max_output_ptr = comp->num_output_ptr + 4; - if (comp->output_ptr != NULL) - { - png_bytepp old_ptr; + /* Link in this buffer (so that it will be freed later) */ + next->next = NULL; + *end = next; + } - old_ptr = comp->output_ptr; + png_ptr->zstream.next_out = next->output; + png_ptr->zstream.avail_out = png_ptr->zbuffer_size; + output_len += png_ptr->zstream.avail_out; - /* This could be optimized to realloc() */ - comp->output_ptr = (png_bytepp)png_malloc(png_ptr, - (png_alloc_size_t)(comp->max_output_ptr * - png_sizeof(png_charp))); + /* Move 'end' to the next buffer pointer. */ + end = &next->next; + } - png_memcpy(comp->output_ptr, old_ptr, - old_max * png_sizeof(png_charp)); + /* Compress the data */ + ret = deflate(&png_ptr->zstream, + input_len > 0 ? Z_NO_FLUSH : Z_FINISH); - png_free(png_ptr, old_ptr); + /* Claw back input data that was not consumed (because avail_in is + * reset above every time round the loop). + */ + input_len += png_ptr->zstream.avail_in; + png_ptr->zstream.avail_in = 0; /* safety */ } + while (ret == Z_OK); - else - comp->output_ptr = (png_bytepp)png_malloc(png_ptr, - (png_alloc_size_t)(comp->max_output_ptr * - png_sizeof(png_charp))); + /* There may be some space left in the last output buffer, this needs to + * be subtracted from output_len. + */ + output_len -= png_ptr->zstream.avail_out; + png_ptr->zstream.avail_out = 0; /* safety */ + comp->output_len = output_len; + + /* Now double check the output length, put in a custom message if it is + * too long. Otherwise ensure the z_stream::msg pointer is set to + * something. + */ + if (output_len + prefix_len >= PNG_UINT_31_MAX) + { + png_ptr->zstream.msg = PNGZ_MSG_CAST("compressed data too long"); + ret = Z_MEM_ERROR; } - /* Save the data */ - comp->output_ptr[comp->num_output_ptr] = - (png_bytep)png_malloc(png_ptr, - (png_alloc_size_t)png_ptr->zbuf_size); + else + png_zstream_error(png_ptr, ret); - png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf, - png_ptr->zbuf_size); + /* Reset zlib for another zTXt/iTXt or image data */ + png_ptr->zowner = 0; - comp->num_output_ptr++; + /* The only success case is Z_STREAM_END, input_len must be 0, if not this + * is an internal error. + */ + if (ret == Z_STREAM_END && input_len == 0) + { + /* Fix up the deflate header, if required */ + optimize_cmf(comp->output, comp->input_len); - /* and reset the buffer pointers */ - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_out = png_ptr->zbuf; - } + /* But Z_OK is returned, not Z_STREAM_END; this allows the claim + * function above to return Z_STREAM_END on an error (though it never + * does in the current versions of zlib.) + */ + return Z_OK; } - else if (ret != Z_STREAM_END) - { - /* We got an error */ - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); else - png_error(png_ptr, "zlib error"); + return ret; } - } while (ret != Z_STREAM_END); - - /* Text length is number of buffers plus last buffer */ - text_len = png_ptr->zbuf_size * comp->num_output_ptr; - - if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) - text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out; - - return((int)text_len); } /* Ship the compressed text out via chunk writes */ -static void /* PRIVATE */ -png_write_compressed_data_out(png_structp png_ptr, compression_state *comp, - png_size_t data_len) +static void +png_write_compressed_data_out(png_structrp png_ptr, compression_state *comp) { - int i; + png_uint_32 output_len = comp->output_len; + png_const_bytep output = comp->output; + png_uint_32 avail = (sizeof comp->output); + png_compression_buffer *next = png_ptr->zbuffer_list; - /* Handle the no-compression case */ - if (comp->input) + for (;;) { - png_write_chunk_data(png_ptr, comp->input, data_len); + if (avail > output_len) + avail = output_len; - return; - } + png_write_chunk_data(png_ptr, output, avail); -#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED - /* The zbuf_size test is because the code below doesn't work if zbuf_size is - * '1'; simply skip it to avoid memory overwrite. - */ - if (data_len >= 2 && comp->input_len < 16384 && png_ptr->zbuf_size > 1) - { - unsigned int z_cmf; /* zlib compression method and flags */ + output_len -= avail; - /* Optimize the CMF field in the zlib stream. This hack of the zlib - * stream is compliant to the stream specification. - */ + if (output_len == 0 || next == NULL) + break; - if (comp->num_output_ptr) - z_cmf = comp->output_ptr[0][0]; - else - z_cmf = png_ptr->zbuf[0]; + avail = png_ptr->zbuffer_size; + output = next->output; + next = next->next; + } - if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) - { - unsigned int z_cinfo; - unsigned int half_z_window_size; - png_size_t uncompressed_text_size = comp->input_len; + /* This is an internal error; 'next' must have been NULL! */ + if (output_len > 0) + png_error(png_ptr, "error writing ancillary chunked compressed data"); +} +#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ - z_cinfo = z_cmf >> 4; - half_z_window_size = 1 << (z_cinfo + 7); +#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ + defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) +/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, + * and if invalid, correct the keyword rather than discarding the entire + * chunk. The PNG 1.0 specification requires keywords 1-79 characters in + * length, forbids leading or trailing whitespace, multiple internal spaces, + * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. + * + * The 'new_key' buffer must be 80 characters in size (for the keyword plus a + * trailing '\0'). If this routine returns 0 then there was no keyword, or a + * valid one could not be generated, and the caller must png_error. + */ +static png_uint_32 +png_check_keyword(png_structrp png_ptr, png_const_charp key, png_bytep new_key) +{ + png_const_charp orig_key = key; + png_uint_32 key_len = 0; + int bad_character = 0; + int space = 1; + + png_debug(1, "in png_check_keyword"); - while (uncompressed_text_size <= half_z_window_size && - half_z_window_size >= 256) + if (key == NULL) { - z_cinfo--; - half_z_window_size >>= 1; + *new_key = 0; + return 0; } - z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); - - if (comp->num_output_ptr) + while (*key && key_len < 79) { + png_byte ch = (png_byte)(0xff & *key++); - if (comp->output_ptr[0][0] != z_cmf) - { - int tmp; + if ((ch > 32 && ch <= 126) || (ch >= 161 /*&& ch <= 255*/)) + *new_key++ = ch, ++key_len, space = 0; - comp->output_ptr[0][0] = (png_byte)z_cmf; - tmp = comp->output_ptr[0][1] & 0xe0; - tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; - comp->output_ptr[0][1] = (png_byte)tmp; - } - } - else + else if (!space) { - int tmp; + /* A space or an invalid character when one wasn't seen immediately + * before; output just a space. + */ + *new_key++ = 32, ++key_len, space = 1; - png_ptr->zbuf[0] = (png_byte)z_cmf; - tmp = png_ptr->zbuf[1] & 0xe0; - tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; - png_ptr->zbuf[1] = (png_byte)tmp; - } + /* If the character was not a space then it is invalid. */ + if (ch != 32) + bad_character = ch; } - else - png_error(png_ptr, - "Invalid zlib compression method or flags in non-IDAT chunk"); + else if (!bad_character) + bad_character = ch; /* just skip it, record the first error */ } -#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */ - /* Write saved output buffers, if any */ - for (i = 0; i < comp->num_output_ptr; i++) + if (key_len > 0 && space) /* trailing space */ { - png_write_chunk_data(png_ptr, comp->output_ptr[i], - (png_size_t)png_ptr->zbuf_size); - - png_free(png_ptr, comp->output_ptr[i]); + --key_len, --new_key; + if (!bad_character) + bad_character = 32; } - if (comp->max_output_ptr != 0) - png_free(png_ptr, comp->output_ptr); + /* Terminate the keyword */ + *new_key = 0; - /* Write anything left in zbuf */ - if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size) - png_write_chunk_data(png_ptr, png_ptr->zbuf, - (png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out)); + if (key_len == 0) + return 0; - /* Reset zlib for another zTXt/iTXt or image data */ - png_zlib_release(png_ptr); + /* Try to only output one warning per keyword: */ + if (*key) /* keyword too long */ + png_warning(png_ptr, "keyword truncated"); + + else if (bad_character) + { + PNG_WARNING_PARAMETERS(p) + + png_warning_parameter(p, 1, orig_key); + png_warning_parameter_signed(p, 2, PNG_NUMBER_FORMAT_02x, bad_character); + + png_formatted_warning(png_ptr, p, "keyword \"@1\": bad character '0x@2'"); } -#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ + + return key_len; +} +#endif /* Write the IHDR chunk, and update the png_struct with the necessary * information. Note that the rest of this code depends upon this * information being correct. */ void /* PRIVATE */ -png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height, +png_write_IHDR(png_structrp png_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, int compression_type, int filter_type, int interlace_type) { png_byte buf[13]; /* Buffer to store the IHDR info */ @@ -820,13 +897,8 @@ /* Write the chunk */ png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13); - /* Initialize zlib with PNG info */ - png_ptr->zstream.zalloc = png_zalloc; - png_ptr->zstream.zfree = png_zfree; - png_ptr->zstream.opaque = (voidpf)png_ptr; - if (!(png_ptr->do_filter)) { if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE || png_ptr->bit_depth < 8) @@ -835,66 +907,17 @@ else png_ptr->do_filter = PNG_ALL_FILTERS; } - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY)) - { - if (png_ptr->do_filter != PNG_FILTER_NONE) - png_ptr->zlib_strategy = Z_FILTERED; - - else - png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY; - } - - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL)) - png_ptr->zlib_level = Z_DEFAULT_COMPRESSION; - - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL)) - png_ptr->zlib_mem_level = 8; - - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS)) - png_ptr->zlib_window_bits = 15; - - if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD)) - png_ptr->zlib_method = 8; - -#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED -#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED - if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_STRATEGY)) - png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY; - - if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_LEVEL)) - png_ptr->zlib_text_level = png_ptr->zlib_level; - - if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL)) - png_ptr->zlib_text_mem_level = png_ptr->zlib_mem_level; - - if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS)) - png_ptr->zlib_text_window_bits = png_ptr->zlib_window_bits; - - if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_METHOD)) - png_ptr->zlib_text_method = png_ptr->zlib_method; -#else - png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY; - png_ptr->zlib_text_level = png_ptr->zlib_level; - png_ptr->zlib_text_mem_level = png_ptr->zlib_mem_level; - png_ptr->zlib_text_window_bits = png_ptr->zlib_window_bits; - png_ptr->zlib_text_method = png_ptr->zlib_method; -#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ -#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */ - - /* Record that the compressor has not yet been initialized. */ - png_ptr->zlib_state = PNG_ZLIB_UNINITIALIZED; - png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */ } /* Write the palette. We are careful not to trust png_color to be in the * correct order for PNG, so people can redefine it to any convenient * structure. */ void /* PRIVATE */ -png_write_PLTE(png_structp png_ptr, png_const_colorp palette, +png_write_PLTE(png_structrp png_ptr, png_const_colorp palette, png_uint_32 num_pal) { png_uint_32 i; png_const_colorp pal_ptr; @@ -960,96 +983,167 @@ png_write_chunk_end(png_ptr); png_ptr->mode |= PNG_HAVE_PLTE; } -/* Write an IDAT chunk */ -void /* PRIVATE */ -png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length) +/* This is similar to png_text_compress, above, except that it does not require + * all of the data at once and, instead of buffering the compressed result, + * writes it as IDAT chunks. Unlike png_text_compress it *can* png_error out + * because it calls the write interface. As a result it does its own error + * reporting and does not return an error code. In the event of error it will + * just call png_error. The input data length may exceed 32-bits. The 'flush' + * parameter is exactly the same as that to deflate, with the following + * meanings: + * + * Z_NO_FLUSH: normal incremental output of compressed data + * Z_SYNC_FLUSH: do a SYNC_FLUSH, used by png_write_flush + * Z_FINISH: this is the end of the input, do a Z_FINISH and clean up + * + * The routine manages the acquire and release of the png_ptr->zstream by + * checking and (at the end) clearing png_ptr->zowner, it does some sanity + * checks on the 'mode' flags while doing this. + */ +void /* PRIVATE */ +png_compress_IDAT(png_structrp png_ptr, png_const_bytep input, + png_alloc_size_t input_len, int flush) +{ + if (png_ptr->zowner != png_IDAT) + { + /* First time. Ensure we have a temporary buffer for compression and + * trim the buffer list if it has more than one entry to free memory. + * If 'WRITE_COMPRESSED_TEXT' is not set the list will never have been + * created at this point, but the check here is quick and safe. + */ + if (png_ptr->zbuffer_list == NULL) + { + png_ptr->zbuffer_list = png_voidcast(png_compression_bufferp, + png_malloc(png_ptr, PNG_COMPRESSION_BUFFER_SIZE(png_ptr))); + png_ptr->zbuffer_list->next = NULL; + } + + else + png_free_buffer_list(png_ptr, &png_ptr->zbuffer_list->next); + + /* It is a terminal error if we can't claim the zstream. */ + if (png_deflate_claim(png_ptr, png_IDAT, png_image_size(png_ptr)) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); + + /* The output state is maintained in png_ptr->zstream, so it must be + * initialized here after the claim. + */ + png_ptr->zstream.next_out = png_ptr->zbuffer_list->output; + png_ptr->zstream.avail_out = png_ptr->zbuffer_size; + } + + /* Now loop reading and writing until all the input is consumed or an error + * terminates the operation. The _out values are maintained across calls to + * this function, but the input must be reset each time. + */ + png_ptr->zstream.next_in = PNGZ_INPUT_CAST(input); + png_ptr->zstream.avail_in = 0; /* set below */ + for (;;) + { + int ret; + + /* INPUT: from the row data */ + uInt avail = ZLIB_IO_MAX; + + if (avail > input_len) + avail = (uInt)input_len; /* safe because of the check */ + + png_ptr->zstream.avail_in = avail; + input_len -= avail; + + ret = deflate(&png_ptr->zstream, input_len > 0 ? Z_NO_FLUSH : flush); + + /* Include as-yet unconsumed input */ + input_len += png_ptr->zstream.avail_in; + png_ptr->zstream.avail_in = 0; + + /* OUTPUT: write complete IDAT chunks when avail_out drops to zero, note + * that these two zstream fields are preserved across the calls, therefore + * there is no need to set these up on entry to the loop. + */ + if (png_ptr->zstream.avail_out == 0) { - png_debug(1, "in png_write_IDAT"); + png_bytep data = png_ptr->zbuffer_list->output; + uInt size = png_ptr->zbuffer_size; + /* Write an IDAT containing the data then reset the buffer. The + * first IDAT may need deflate header optimization. + */ #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED if (!(png_ptr->mode & PNG_HAVE_IDAT) && png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) - { - /* Optimize the CMF field in the zlib stream. This hack of the zlib - * stream is compliant to the stream specification. - */ - unsigned int z_cmf = data[0]; /* zlib compression method and flags */ + optimize_cmf(data, png_image_size(png_ptr)); +# endif - if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70) - { - /* Avoid memory underflows and multiplication overflows. - * - * The conditions below are practically always satisfied; - * however, they still must be checked. + png_write_complete_chunk(png_ptr, png_IDAT, data, size); + png_ptr->mode |= PNG_HAVE_IDAT; + + png_ptr->zstream.next_out = data; + png_ptr->zstream.avail_out = size; + + /* For SYNC_FLUSH or FINISH it is essential to keep calling zlib with + * the same flush parameter until it has finished output, for NO_FLUSH + * it doesn't matter. */ - if (length >= 2 && - png_ptr->height < 16384 && png_ptr->width < 16384) - { - /* Compute the maximum possible length of the datastream */ + if (ret == Z_OK && flush != Z_NO_FLUSH) + continue; + } - /* Number of pixels, plus for each row a filter byte - * and possibly a padding byte, so increase the maximum - * size to account for these. + /* The order of these checks doesn't matter much; it just effect which + * possible error might be detected if multiple things go wrong at once. */ - unsigned int z_cinfo; - unsigned int half_z_window_size; - png_uint_32 uncompressed_idat_size = png_ptr->height * - ((png_ptr->width * - png_ptr->channels * png_ptr->bit_depth + 15) >> 3); - - /* If it's interlaced, each block of 8 rows is sent as up to - * 14 rows, i.e., 6 additional rows, each with a filter byte - * and possibly a padding byte + if (ret == Z_OK) /* most likely return code! */ + { + /* If all the input has been consumed then just return. If Z_FINISH + * was used as the flush parameter something has gone wrong if we get + * here. */ - if (png_ptr->interlaced) - uncompressed_idat_size += ((png_ptr->height + 7)/8) * - (png_ptr->bit_depth < 8 ? 12 : 6); + if (input_len == 0) + { + if (flush == Z_FINISH) + png_error(png_ptr, "Z_OK on Z_FINISH with output space"); - z_cinfo = z_cmf >> 4; - half_z_window_size = 1 << (z_cinfo + 7); + return; + } + } - while (uncompressed_idat_size <= half_z_window_size && - half_z_window_size >= 256) + else if (ret == Z_STREAM_END && flush == Z_FINISH) { - z_cinfo--; - half_z_window_size >>= 1; - } + /* This is the end of the IDAT data; any pending output must be + * flushed. For small PNG files we may still be at the beginning. + */ + png_bytep data = png_ptr->zbuffer_list->output; + uInt size = png_ptr->zbuffer_size - png_ptr->zstream.avail_out; - z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4); +# ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED + if (!(png_ptr->mode & PNG_HAVE_IDAT) && + png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE) + optimize_cmf(data, png_image_size(png_ptr)); +# endif - if (data[0] != z_cmf) - { - int tmp; - data[0] = (png_byte)z_cmf; - tmp = data[1] & 0xe0; - tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f; - data[1] = (png_byte)tmp; - } - } + png_write_complete_chunk(png_ptr, png_IDAT, data, size); + png_ptr->zstream.avail_out = 0; + png_ptr->zstream.next_out = NULL; + png_ptr->mode |= PNG_HAVE_IDAT | PNG_AFTER_IDAT; + + png_ptr->zowner = 0; /* Release the stream */ + return; } else - png_error(png_ptr, - "Invalid zlib compression method or flags in IDAT"); + { + /* This is an error condition. */ + png_zstream_error(png_ptr, ret); + png_error(png_ptr, png_ptr->zstream.msg); + } } -#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */ - - png_write_complete_chunk(png_ptr, png_IDAT, data, length); - png_ptr->mode |= PNG_HAVE_IDAT; - - /* Prior to 1.5.4 this code was replicated in every caller (except at the - * end, where it isn't technically necessary). Since this function has - * flushed the data we can safely reset the zlib output buffer here. - */ - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; } /* Write an IEND chunk */ void /* PRIVATE */ -png_write_IEND(png_structp png_ptr) +png_write_IEND(png_structrp png_ptr) { png_debug(1, "in png_write_IEND"); png_write_complete_chunk(png_ptr, png_IEND, NULL, (png_size_t)0); @@ -1058,9 +1152,9 @@ #ifdef PNG_WRITE_gAMA_SUPPORTED /* Write a gAMA chunk */ void /* PRIVATE */ -png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma) +png_write_gAMA_fixed(png_structrp png_ptr, png_fixed_point file_gamma) { png_byte buf[4]; png_debug(1, "in png_write_gAMA"); @@ -1073,9 +1167,9 @@ #ifdef PNG_WRITE_sRGB_SUPPORTED /* Write a sRGB chunk */ void /* PRIVATE */ -png_write_sRGB(png_structp png_ptr, int srgb_intent) +png_write_sRGB(png_structrp png_ptr, int srgb_intent) { png_byte buf[1]; png_debug(1, "in png_write_sRGB"); @@ -1091,96 +1185,72 @@ #ifdef PNG_WRITE_iCCP_SUPPORTED /* Write an iCCP chunk */ void /* PRIVATE */ -png_write_iCCP(png_structp png_ptr, png_const_charp name, int compression_type, - png_const_charp profile, int profile_len) +png_write_iCCP(png_structrp png_ptr, png_const_charp name, + png_const_bytep profile) { - png_size_t name_len; - png_charp new_name; + png_uint_32 name_len; + png_uint_32 profile_len; + png_byte new_name[81]; /* 1 byte for the compression byte */ compression_state comp; - int embedded_profile_len = 0; png_debug(1, "in png_write_iCCP"); - comp.num_output_ptr = 0; - comp.max_output_ptr = 0; - comp.output_ptr = NULL; - comp.input = NULL; - comp.input_len = 0; - - if ((name_len = png_check_keyword(png_ptr, name, &new_name)) == 0) - return; - - if (compression_type != PNG_COMPRESSION_TYPE_BASE) - png_warning(png_ptr, "Unknown compression type in iCCP chunk"); - + /* These are all internal problems: the profile should have been checked + * before when it was stored. + */ if (profile == NULL) - profile_len = 0; + png_error(png_ptr, "No profile for iCCP chunk"); /* internal error */ - if (profile_len > 3) - embedded_profile_len = - ((*( (png_const_bytep)profile ))<<24) | - ((*( (png_const_bytep)profile + 1))<<16) | - ((*( (png_const_bytep)profile + 2))<< 8) | - ((*( (png_const_bytep)profile + 3)) ); + profile_len = png_get_uint_32(profile); - if (embedded_profile_len < 0) - { - png_warning(png_ptr, - "Embedded profile length in iCCP chunk is negative"); + if (profile_len < 132) + png_error(png_ptr, "ICC profile too short"); - png_free(png_ptr, new_name); - return; - } + if (profile_len & 0x03) + png_error(png_ptr, "ICC profile length invalid (not a multiple of 4)"); - if (profile_len < embedded_profile_len) { - png_warning(png_ptr, - "Embedded profile length too large in iCCP chunk"); + png_uint_32 embedded_profile_len = png_get_uint_32(profile); - png_free(png_ptr, new_name); - return; + if (profile_len != embedded_profile_len) + png_error(png_ptr, "Profile length does not match profile"); } - if (profile_len > embedded_profile_len) - { - png_warning(png_ptr, - "Truncating profile to actual length in iCCP chunk"); + name_len = png_check_keyword(png_ptr, name, new_name); - profile_len = embedded_profile_len; - } + if (name_len == 0) + png_error(png_ptr, "iCCP: invalid keyword"); - if (profile_len) - profile_len = png_text_compress(png_ptr, profile, - (png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp); + new_name[++name_len] = PNG_COMPRESSION_TYPE_BASE; /* Make sure we include the NULL after the name and the compression type */ - png_write_chunk_header(png_ptr, png_iCCP, - (png_uint_32)(name_len + profile_len + 2)); + ++name_len; - new_name[name_len + 1] = 0x00; + png_text_compress_init(&comp, profile, profile_len); - png_write_chunk_data(png_ptr, (png_bytep)new_name, - (png_size_t)(name_len + 2)); + /* Allow for keyword terminator and compression byte */ + if (png_text_compress(png_ptr, png_iCCP, &comp, name_len) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); - if (profile_len) - { - png_write_compressed_data_out(png_ptr, &comp, profile_len); - } + png_write_chunk_header(png_ptr, png_iCCP, name_len + comp.output_len); + + png_write_chunk_data(png_ptr, new_name, name_len); + + png_write_compressed_data_out(png_ptr, &comp); png_write_chunk_end(png_ptr); - png_free(png_ptr, new_name); } #endif #ifdef PNG_WRITE_sPLT_SUPPORTED /* Write a sPLT chunk */ void /* PRIVATE */ -png_write_sPLT(png_structp png_ptr, png_const_sPLT_tp spalette) +png_write_sPLT(png_structrp png_ptr, png_const_sPLT_tp spalette) { - png_size_t name_len; - png_charp new_name; + png_uint_32 name_len; + png_byte new_name[80]; png_byte entrybuf[10]; png_size_t entry_size = (spalette->depth == 8 ? 6 : 10); png_size_t palette_size = entry_size * spalette->nentries; png_sPLT_entryp ep; @@ -1189,10 +1259,12 @@ #endif png_debug(1, "in png_write_sPLT"); - if ((name_len = png_check_keyword(png_ptr,spalette->name, &new_name))==0) - return; + name_len = png_check_keyword(png_ptr, spalette->name, new_name); + + if (name_len == 0) + png_error(png_ptr, "sPLT: invalid keyword"); /* Make sure we include the NULL after the name */ png_write_chunk_header(png_ptr, png_sPLT, (png_uint_32)(name_len + 2 + palette_size)); @@ -1223,9 +1295,9 @@ png_save_uint_16(entrybuf + 6, ep->alpha); png_save_uint_16(entrybuf + 8, ep->frequency); } - png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size); + png_write_chunk_data(png_ptr, entrybuf, entry_size); } #else ep=spalette->entries; for (i = 0; i>spalette->nentries; i++) @@ -1247,21 +1319,20 @@ png_save_uint_16(entrybuf + 6, ep[i].alpha); png_save_uint_16(entrybuf + 8, ep[i].frequency); } - png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size); + png_write_chunk_data(png_ptr, entrybuf, entry_size); } #endif png_write_chunk_end(png_ptr); - png_free(png_ptr, new_name); } #endif #ifdef PNG_WRITE_sBIT_SUPPORTED /* Write the sBIT chunk */ void /* PRIVATE */ -png_write_sBIT(png_structp png_ptr, png_const_color_8p sbit, int color_type) +png_write_sBIT(png_structrp png_ptr, png_const_color_8p sbit, int color_type) { png_byte buf[4]; png_size_t size; @@ -1318,44 +1389,35 @@ #ifdef PNG_WRITE_cHRM_SUPPORTED /* Write the cHRM chunk */ void /* PRIVATE */ -png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x, - png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y, - png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x, - png_fixed_point blue_y) +png_write_cHRM_fixed(png_structrp png_ptr, const png_xy *xy) { png_byte buf[32]; png_debug(1, "in png_write_cHRM"); /* Each value is saved in 1/100,000ths */ -#ifdef PNG_CHECK_cHRM_SUPPORTED - if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y, - green_x, green_y, blue_x, blue_y)) -#endif - { - png_save_uint_32(buf, (png_uint_32)white_x); - png_save_uint_32(buf + 4, (png_uint_32)white_y); + png_save_int_32(buf, xy->whitex); + png_save_int_32(buf + 4, xy->whitey); - png_save_uint_32(buf + 8, (png_uint_32)red_x); - png_save_uint_32(buf + 12, (png_uint_32)red_y); + png_save_int_32(buf + 8, xy->redx); + png_save_int_32(buf + 12, xy->redy); - png_save_uint_32(buf + 16, (png_uint_32)green_x); - png_save_uint_32(buf + 20, (png_uint_32)green_y); + png_save_int_32(buf + 16, xy->greenx); + png_save_int_32(buf + 20, xy->greeny); - png_save_uint_32(buf + 24, (png_uint_32)blue_x); - png_save_uint_32(buf + 28, (png_uint_32)blue_y); + png_save_int_32(buf + 24, xy->bluex); + png_save_int_32(buf + 28, xy->bluey); - png_write_complete_chunk(png_ptr, png_cHRM, buf, (png_size_t)32); - } + png_write_complete_chunk(png_ptr, png_cHRM, buf, 32); } #endif #ifdef PNG_WRITE_tRNS_SUPPORTED /* Write the tRNS chunk */ void /* PRIVATE */ -png_write_tRNS(png_structp png_ptr, png_const_bytep trans_alpha, +png_write_tRNS(png_structrp png_ptr, png_const_bytep trans_alpha, png_const_color_16p tran, int num_trans, int color_type) { png_byte buf[6]; @@ -1418,9 +1480,9 @@ #ifdef PNG_WRITE_bKGD_SUPPORTED /* Write the background chunk */ void /* PRIVATE */ -png_write_bKGD(png_structp png_ptr, png_const_color_16p back, int color_type) +png_write_bKGD(png_structrp png_ptr, png_const_color_16p back, int color_type) { png_byte buf[6]; png_debug(1, "in png_write_bKGD"); @@ -1480,9 +1542,9 @@ #ifdef PNG_WRITE_hIST_SUPPORTED /* Write the histogram */ void /* PRIVATE */ -png_write_hIST(png_structp png_ptr, png_const_uint_16p hist, int num_hist) +png_write_hIST(png_structrp png_ptr, png_const_uint_16p hist, int num_hist) { int i; png_byte buf[3]; @@ -1508,236 +1570,97 @@ png_write_chunk_end(png_ptr); } #endif -#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ - defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) -/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification, - * and if invalid, correct the keyword rather than discarding the entire - * chunk. The PNG 1.0 specification requires keywords 1-79 characters in - * length, forbids leading or trailing whitespace, multiple internal spaces, - * and the non-break space (0x80) from ISO 8859-1. Returns keyword length. - * - * The new_key is allocated to hold the corrected keyword and must be freed - * by the calling routine. This avoids problems with trying to write to - * static keywords without having to have duplicate copies of the strings. - */ -png_size_t /* PRIVATE */ -png_check_keyword(png_structp png_ptr, png_const_charp key, png_charpp new_key) -{ - png_size_t key_len; - png_const_charp ikp; - png_charp kp, dp; - int kflag; - int kwarn=0; - - png_debug(1, "in png_check_keyword"); - - *new_key = NULL; - - if (key == NULL || (key_len = png_strlen(key)) == 0) - { - png_warning(png_ptr, "zero length keyword"); - return ((png_size_t)0); - } - - png_debug1(2, "Keyword to be checked is '%s'", key); - - *new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2)); - - if (*new_key == NULL) - { - png_warning(png_ptr, "Out of memory while procesing keyword"); - return ((png_size_t)0); - } - - /* Replace non-printing characters with a blank and print a warning */ - for (ikp = key, dp = *new_key; *ikp != '\0'; ikp++, dp++) - { - if ((png_byte)*ikp < 0x20 || - ((png_byte)*ikp > 0x7E && (png_byte)*ikp < 0xA1)) - { - PNG_WARNING_PARAMETERS(p) - - png_warning_parameter_unsigned(p, 1, PNG_NUMBER_FORMAT_02x, - (png_byte)*ikp); - png_formatted_warning(png_ptr, p, "invalid keyword character 0x@1"); - *dp = ' '; - } - - else - { - *dp = *ikp; - } - } - *dp = '\0'; - - /* Remove any trailing white space. */ - kp = *new_key + key_len - 1; - if (*kp == ' ') - { - png_warning(png_ptr, "trailing spaces removed from keyword"); - - while (*kp == ' ') - { - *(kp--) = '\0'; - key_len--; - } - } - - /* Remove any leading white space. */ - kp = *new_key; - if (*kp == ' ') - { - png_warning(png_ptr, "leading spaces removed from keyword"); - - while (*kp == ' ') - { - kp++; - key_len--; - } - } - - png_debug1(2, "Checking for multiple internal spaces in '%s'", kp); - - /* Remove multiple internal spaces. */ - for (kflag = 0, dp = *new_key; *kp != '\0'; kp++) - { - if (*kp == ' ' && kflag == 0) - { - *(dp++) = *kp; - kflag = 1; - } - - else if (*kp == ' ') - { - key_len--; - kwarn = 1; - } - - else - { - *(dp++) = *kp; - kflag = 0; - } - } - *dp = '\0'; - if (kwarn) - png_warning(png_ptr, "extra interior spaces removed from keyword"); - - if (key_len == 0) - { - png_free(png_ptr, *new_key); - png_warning(png_ptr, "Zero length keyword"); - } - - if (key_len > 79) - { - png_warning(png_ptr, "keyword length must be 1 - 79 characters"); - (*new_key)[79] = '\0'; - key_len = 79; - } - - return (key_len); -} -#endif - #ifdef PNG_WRITE_tEXt_SUPPORTED /* Write a tEXt chunk */ void /* PRIVATE */ -png_write_tEXt(png_structp png_ptr, png_const_charp key, png_const_charp text, +png_write_tEXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, png_size_t text_len) { - png_size_t key_len; - png_charp new_key; + png_uint_32 key_len; + png_byte new_key[80]; png_debug(1, "in png_write_tEXt"); - if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0) - return; + key_len = png_check_keyword(png_ptr, key, new_key); + + if (key_len == 0) + png_error(png_ptr, "tEXt: invalid keyword"); if (text == NULL || *text == '\0') text_len = 0; else - text_len = png_strlen(text); + text_len = strlen(text); + + if (text_len > PNG_UINT_31_MAX - (key_len+1)) + png_error(png_ptr, "tEXt: text too long"); /* Make sure we include the 0 after the key */ png_write_chunk_header(png_ptr, png_tEXt, - (png_uint_32)(key_len + text_len + 1)); + (png_uint_32)/*checked above*/(key_len + text_len + 1)); /* * We leave it to the application to meet PNG-1.0 requirements on the * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. */ - png_write_chunk_data(png_ptr, (png_bytep)new_key, - (png_size_t)(key_len + 1)); + png_write_chunk_data(png_ptr, new_key, key_len + 1); if (text_len) - png_write_chunk_data(png_ptr, (png_const_bytep)text, - (png_size_t)text_len); + png_write_chunk_data(png_ptr, (png_const_bytep)text, text_len); png_write_chunk_end(png_ptr); - png_free(png_ptr, new_key); } #endif #ifdef PNG_WRITE_zTXt_SUPPORTED /* Write a compressed text chunk */ void /* PRIVATE */ -png_write_zTXt(png_structp png_ptr, png_const_charp key, png_const_charp text, +png_write_zTXt(png_structrp png_ptr, png_const_charp key, png_const_charp text, png_size_t text_len, int compression) { - png_size_t key_len; - png_byte buf; - png_charp new_key; + png_uint_32 key_len; + png_byte new_key[81]; compression_state comp; png_debug(1, "in png_write_zTXt"); + PNG_UNUSED(text_len) /* Always use strlen */ - comp.num_output_ptr = 0; - comp.max_output_ptr = 0; - comp.output_ptr = NULL; - comp.input = NULL; - comp.input_len = 0; - - if ((key_len = png_check_keyword(png_ptr, key, &new_key)) == 0) + if (compression == PNG_TEXT_COMPRESSION_NONE) { - png_free(png_ptr, new_key); + png_write_tEXt(png_ptr, key, text, 0); return; } - if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE) - { - png_write_tEXt(png_ptr, new_key, text, (png_size_t)0); - png_free(png_ptr, new_key); - return; - } + if (compression != PNG_TEXT_COMPRESSION_zTXt) + png_error(png_ptr, "zTXt: invalid compression type"); - text_len = png_strlen(text); + key_len = png_check_keyword(png_ptr, key, new_key); - /* Compute the compressed data; do it now for the length */ - text_len = png_text_compress(png_ptr, text, text_len, compression, - &comp); + if (key_len == 0) + png_error(png_ptr, "zTXt: invalid keyword"); - /* Write start of chunk */ - png_write_chunk_header(png_ptr, png_zTXt, - (png_uint_32)(key_len+text_len + 2)); + /* Add the compression method and 1 for the keyword separator. */ + new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; + ++key_len; - /* Write key */ - png_write_chunk_data(png_ptr, (png_bytep)new_key, - (png_size_t)(key_len + 1)); + /* Compute the compressed data; do it now for the length */ + png_text_compress_init(&comp, (png_const_bytep)text, + text == NULL ? 0 : strlen(text)); - png_free(png_ptr, new_key); + if (png_text_compress(png_ptr, png_zTXt, &comp, key_len) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); - buf = (png_byte)compression; + /* Write start of chunk */ + png_write_chunk_header(png_ptr, png_zTXt, key_len + comp.output_len); - /* Write compression */ - png_write_chunk_data(png_ptr, &buf, (png_size_t)1); + /* Write key */ + png_write_chunk_data(png_ptr, new_key, key_len); /* Write the compressed data */ - png_write_compressed_data_out(png_ptr, &comp, text_len); + png_write_compressed_data_out(png_ptr, &comp); /* Close the chunk */ png_write_chunk_end(png_ptr); } @@ -1745,102 +1668,106 @@ #ifdef PNG_WRITE_iTXt_SUPPORTED /* Write an iTXt chunk */ void /* PRIVATE */ -png_write_iTXt(png_structp png_ptr, int compression, png_const_charp key, +png_write_iTXt(png_structrp png_ptr, int compression, png_const_charp key, png_const_charp lang, png_const_charp lang_key, png_const_charp text) { - png_size_t lang_len, key_len, lang_key_len, text_len; - png_charp new_lang; - png_charp new_key = NULL; - png_byte cbuf[2]; + png_uint_32 key_len, prefix_len; + png_size_t lang_len, lang_key_len; + png_byte new_key[82]; compression_state comp; png_debug(1, "in png_write_iTXt"); - comp.num_output_ptr = 0; - comp.max_output_ptr = 0; - comp.output_ptr = NULL; - comp.input = NULL; + key_len = png_check_keyword(png_ptr, key, new_key); - if ((key_len = png_check_keyword(png_ptr, key, &new_key)) == 0) - return; + if (key_len == 0) + png_error(png_ptr, "iTXt: invalid keyword"); - if ((lang_len = png_check_keyword(png_ptr, lang, &new_lang)) == 0) + /* Set the compression flag */ + switch (compression) { - png_warning(png_ptr, "Empty language field in iTXt chunk"); - new_lang = NULL; - lang_len = 0; - } - - if (lang_key == NULL) - lang_key_len = 0; - - else - lang_key_len = png_strlen(lang_key); - - if (text == NULL) - text_len = 0; - - else - text_len = png_strlen(text); - - /* Compute the compressed data; do it now for the length */ - text_len = png_text_compress(png_ptr, text, text_len, compression - 2, - &comp); + case PNG_ITXT_COMPRESSION_NONE: + case PNG_TEXT_COMPRESSION_NONE: + compression = new_key[++key_len] = 0; /* no compression */ + break; + case PNG_TEXT_COMPRESSION_zTXt: + case PNG_ITXT_COMPRESSION_zTXt: + compression = new_key[++key_len] = 1; /* compressed */ + break; - /* Make sure we include the compression flag, the compression byte, - * and the NULs after the key, lang, and lang_key parts - */ + default: + png_error(png_ptr, "iTXt: invalid compression"); + } - png_write_chunk_header(png_ptr, png_iTXt, (png_uint_32)( - 5 /* comp byte, comp flag, terminators for key, lang and lang_key */ - + key_len - + lang_len - + lang_key_len - + text_len)); + new_key[++key_len] = PNG_COMPRESSION_TYPE_BASE; + ++key_len; /* for the keywod separator */ /* We leave it to the application to meet PNG-1.0 requirements on the * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of - * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them. + * any non-Latin-1 characters except for NEWLINE. ISO PNG, however, + * specifies that the text is UTF-8 and this really doesn't require any + * checking. + * * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG. + * + * TODO: validate the language tag correctly (see the spec.) */ - png_write_chunk_data(png_ptr, (png_bytep)new_key, (png_size_t)(key_len + 1)); + if (lang == NULL) lang = ""; /* empty language is valid */ + lang_len = strlen(lang)+1; + if (lang_key == NULL) lang_key = ""; /* may be empty */ + lang_key_len = strlen(lang_key)+1; + if (text == NULL) text = ""; /* may be empty */ - /* Set the compression flag */ - if (compression == PNG_ITXT_COMPRESSION_NONE || - compression == PNG_TEXT_COMPRESSION_NONE) - cbuf[0] = 0; + prefix_len = key_len; + if (lang_len > PNG_UINT_31_MAX-prefix_len) + prefix_len = PNG_UINT_31_MAX; + else + prefix_len = (png_uint_32)(prefix_len + lang_len); + + if (lang_key_len > PNG_UINT_31_MAX-prefix_len) + prefix_len = PNG_UINT_31_MAX; + else + prefix_len = (png_uint_32)(prefix_len + lang_key_len); + + png_text_compress_init(&comp, (png_const_bytep)text, strlen(text)); + + if (compression) + { + if (png_text_compress(png_ptr, png_iTXt, &comp, prefix_len) != Z_OK) + png_error(png_ptr, png_ptr->zstream.msg); + } - else /* compression == PNG_ITXT_COMPRESSION_zTXt */ - cbuf[0] = 1; + else + { + if (comp.input_len > PNG_UINT_31_MAX-prefix_len) + png_error(png_ptr, "iTXt: uncompressed text too long"); + } - /* Set the compression method */ - cbuf[1] = 0; + png_write_chunk_header(png_ptr, png_iTXt, comp.output_len + prefix_len); - png_write_chunk_data(png_ptr, cbuf, (png_size_t)2); + png_write_chunk_data(png_ptr, new_key, key_len); - cbuf[0] = 0; - png_write_chunk_data(png_ptr, (new_lang ? (png_const_bytep)new_lang : cbuf), - (png_size_t)(lang_len + 1)); + png_write_chunk_data(png_ptr, (png_const_bytep)lang, lang_len); - png_write_chunk_data(png_ptr, (lang_key ? (png_const_bytep)lang_key : cbuf), - (png_size_t)(lang_key_len + 1)); + png_write_chunk_data(png_ptr, (png_const_bytep)lang_key, lang_key_len); - png_write_compressed_data_out(png_ptr, &comp, text_len); + if (compression) + png_write_compressed_data_out(png_ptr, &comp); - png_write_chunk_end(png_ptr); + else + png_write_chunk_data(png_ptr, (png_const_bytep)text, comp.input_len); - png_free(png_ptr, new_key); - png_free(png_ptr, new_lang); + png_write_chunk_end(png_ptr); } #endif #ifdef PNG_WRITE_oFFs_SUPPORTED /* Write the oFFs chunk */ void /* PRIVATE */ -png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset, +png_write_oFFs(png_structrp png_ptr, png_int_32 x_offset, png_int_32 y_offset, int unit_type) { png_byte buf[9]; @@ -1858,55 +1785,60 @@ #endif #ifdef PNG_WRITE_pCAL_SUPPORTED /* Write the pCAL chunk (described in the PNG extensions document) */ void /* PRIVATE */ -png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0, +png_write_pCAL(png_structrp png_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_const_charp units, png_charpp params) { - png_size_t purpose_len, units_len, total_len; + png_uint_32 purpose_len; + png_size_t units_len, total_len; png_size_tp params_len; png_byte buf[10]; - png_charp new_purpose; + png_byte new_purpose[80]; int i; png_debug1(1, "in png_write_pCAL (%d parameters)", nparams); if (type >= PNG_EQUATION_LAST) - png_warning(png_ptr, "Unrecognized equation type for pCAL chunk"); + png_error(png_ptr, "Unrecognized equation type for pCAL chunk"); + + purpose_len = png_check_keyword(png_ptr, purpose, new_purpose); + + if (purpose_len == 0) + png_error(png_ptr, "pCAL: invalid keyword"); + + ++purpose_len; /* terminator */ - purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1; png_debug1(3, "pCAL purpose length = %d", (int)purpose_len); - units_len = png_strlen(units) + (nparams == 0 ? 0 : 1); + units_len = strlen(units) + (nparams == 0 ? 0 : 1); png_debug1(3, "pCAL units length = %d", (int)units_len); total_len = purpose_len + units_len + 10; params_len = (png_size_tp)png_malloc(png_ptr, - (png_alloc_size_t)(nparams * png_sizeof(png_size_t))); + (png_alloc_size_t)(nparams * (sizeof (png_size_t)))); /* Find the length of each parameter, making sure we don't count the * null terminator for the last parameter. */ for (i = 0; i < nparams; i++) { - params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1); + params_len[i] = strlen(params[i]) + (i == nparams - 1 ? 0 : 1); png_debug2(3, "pCAL parameter %d length = %lu", i, (unsigned long)params_len[i]); total_len += params_len[i]; } png_debug1(3, "pCAL total length = %d", (int)total_len); png_write_chunk_header(png_ptr, png_pCAL, (png_uint_32)total_len); - png_write_chunk_data(png_ptr, (png_const_bytep)new_purpose, purpose_len); + png_write_chunk_data(png_ptr, new_purpose, purpose_len); png_save_int_32(buf, X0); png_save_int_32(buf + 4, X1); buf[8] = (png_byte)type; buf[9] = (png_byte)nparams; png_write_chunk_data(png_ptr, buf, (png_size_t)10); png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len); - png_free(png_ptr, new_purpose); - for (i = 0; i < nparams; i++) { png_write_chunk_data(png_ptr, (png_const_bytep)params[i], params_len[i]); } @@ -1918,18 +1850,18 @@ #ifdef PNG_WRITE_sCAL_SUPPORTED /* Write the sCAL chunk */ void /* PRIVATE */ -png_write_sCAL_s(png_structp png_ptr, int unit, png_const_charp width, +png_write_sCAL_s(png_structrp png_ptr, int unit, png_const_charp width, png_const_charp height) { png_byte buf[64]; png_size_t wlen, hlen, total_len; png_debug(1, "in png_write_sCAL_s"); - wlen = png_strlen(width); - hlen = png_strlen(height); + wlen = strlen(width); + hlen = strlen(height); total_len = wlen + hlen + 2; if (total_len > 64) { @@ -1937,10 +1869,10 @@ return; } buf[0] = (png_byte)unit; - png_memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */ - png_memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */ + memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */ + memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */ png_debug1(3, "sCAL total length = %u", (unsigned int)total_len); png_write_complete_chunk(png_ptr, png_sCAL, buf, total_len); } @@ -1948,9 +1880,9 @@ #ifdef PNG_WRITE_pHYs_SUPPORTED /* Write the pHYs chunk */ void /* PRIVATE */ -png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit, +png_write_pHYs(png_structrp png_ptr, png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, int unit_type) { png_byte buf[9]; @@ -1972,9 +1904,9 @@ /* Write the tIME chunk. Use either png_convert_from_struct_tm() * or png_convert_from_time_t(), or fill in the structure yourself. */ void /* PRIVATE */ -png_write_tIME(png_structp png_ptr, png_const_timep mod_time) +png_write_tIME(png_structrp png_ptr, png_const_timep mod_time) { png_byte buf[7]; png_debug(1, "in png_write_tIME"); @@ -1999,9 +1931,9 @@ #endif /* Initializes the row writing capability of libpng */ void /* PRIVATE */ -png_write_start_row(png_structp png_ptr) +png_write_start_row(png_structrp png_ptr) { #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ @@ -2101,17 +2033,13 @@ { png_ptr->num_rows = png_ptr->height; png_ptr->usr_width = png_ptr->width; } - - png_zlib_claim(png_ptr, PNG_ZLIB_FOR_IDAT); - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - png_ptr->zstream.next_out = png_ptr->zbuf; } /* Internal use only. Called when finished processing a row of data. */ void /* PRIVATE */ -png_write_finish_row(png_structp png_ptr) +png_write_finish_row(png_structrp png_ptr) { #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */ @@ -2127,10 +2055,8 @@ /* Offset to next interlace block in the y direction */ static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2}; #endif - int ret; - png_debug(1, "in png_write_finish_row"); /* Next row */ png_ptr->row_number++; @@ -2179,9 +2105,9 @@ /* Reset the row above the image for the next pass */ if (png_ptr->pass < 7) { if (png_ptr->prev_row != NULL) - png_memset(png_ptr->prev_row, 0, + memset(png_ptr->prev_row, 0, (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels* png_ptr->usr_bit_depth, png_ptr->width)) + 1); return; @@ -2190,44 +2116,9 @@ #endif /* If we get here, we've just written the last row, so we need to flush the compressor */ - do - { - /* Tell the compressor we are done */ - ret = deflate(&png_ptr->zstream, Z_FINISH); - - /* Check for an error */ - if (ret == Z_OK) - { - /* Check to see if we need more room */ - if (!(png_ptr->zstream.avail_out)) - { - png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - png_ptr->zstream.next_out = png_ptr->zbuf; - png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size; - } - } - - else if (ret != Z_STREAM_END) - { - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); - - else - png_error(png_ptr, "zlib error"); - } - } while (ret != Z_STREAM_END); - - /* Write any extra space */ - if (png_ptr->zstream.avail_out < png_ptr->zbuf_size) - { - png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size - - png_ptr->zstream.avail_out); - } - - png_zlib_release(png_ptr); - png_ptr->zstream.data_type = Z_BINARY; + png_compress_IDAT(png_ptr, NULL, 0, Z_FINISH); } #ifdef PNG_WRITE_INTERLACING_SUPPORTED /* Pick out the correct pixels for the interlace pass. @@ -2389,9 +2280,9 @@ sp = row + (png_size_t)i * pixel_bytes; /* Move the pixel */ if (dp != sp) - png_memcpy(dp, sp, pixel_bytes); + memcpy(dp, sp, pixel_bytes); /* Next pixel */ dp += pixel_bytes; } @@ -2413,17 +2304,17 @@ /* This filters the row, chooses which filter to use, if it has not already * been specified by the application, and then writes the row out with the * chosen filter. */ -static void png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row, +static void png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, png_size_t row_bytes); #define PNG_MAXSUM (((png_uint_32)(-1)) >> 1) #define PNG_HISHIFT 10 #define PNG_LOMASK ((png_uint_32)0xffffL) #define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT)) void /* PRIVATE */ -png_write_find_filter(png_structp png_ptr, png_row_infop row_info) +png_write_find_filter(png_structrp png_ptr, png_row_infop row_info) { png_bytep best_row; #ifdef PNG_WRITE_FILTER_SUPPORTED png_bytep prev_row, row_buf; @@ -3092,68 +2983,16 @@ /* Do the actual writing of a previously filtered row. */ static void -png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row, - png_size_t avail/*includes filter byte*/) +png_write_filtered_row(png_structrp png_ptr, png_bytep filtered_row, + png_size_t full_row_length/*includes filter byte*/) { png_debug(1, "in png_write_filtered_row"); png_debug1(2, "filter = %d", filtered_row[0]); - /* Set up the zlib input buffer */ - - png_ptr->zstream.next_in = filtered_row; - png_ptr->zstream.avail_in = 0; - /* Repeat until we have compressed all the data */ - do - { - int ret; /* Return of zlib */ - - /* Record the number of bytes available - zlib supports at least 65535 - * bytes at one step, depending on the size of the zlib type 'uInt', the - * maximum size zlib can write at once is ZLIB_IO_MAX (from pngpriv.h). - * Use this because on 16 bit systems 'rowbytes' can be up to 65536 (i.e. - * one more than 16 bits) and, in this case 'rowbytes+1' can overflow a - * uInt. ZLIB_IO_MAX can be safely reduced to cause zlib to be called - * with smaller chunks of data. - */ - if (png_ptr->zstream.avail_in == 0) - { - if (avail > ZLIB_IO_MAX) - { - png_ptr->zstream.avail_in = ZLIB_IO_MAX; - avail -= ZLIB_IO_MAX; - } - else - { - /* So this will fit in the available uInt space: */ - png_ptr->zstream.avail_in = (uInt)avail; - avail = 0; - } - } - - /* Compress the data */ - ret = deflate(&png_ptr->zstream, Z_NO_FLUSH); - - /* Check for compression errors */ - if (ret != Z_OK) - { - if (png_ptr->zstream.msg != NULL) - png_error(png_ptr, png_ptr->zstream.msg); - - else - png_error(png_ptr, "zlib error"); - } - - /* See if it is time to write another IDAT */ - if (!(png_ptr->zstream.avail_out)) - { - /* Write the IDAT and reset the zlib output buffer */ - png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size); - } - /* Repeat until all data has been compressed */ - } while (avail > 0 || png_ptr->zstream.avail_in > 0); + png_compress_IDAT(png_ptr, filtered_row, full_row_length, Z_NO_FLUSH); /* Swap the current and previous rows */ if (png_ptr->prev_row != NULL) { diff -ru4NwbB libpng-1.5.13/projects/owatcom/libpng.wpj libpng-1.6.0beta32/projects/owatcom/libpng.wpj --- libpng-1.5.13/projects/owatcom/libpng.wpj 2011-12-03 19:57:08.558182000 -0600 +++ libpng-1.6.0beta32/projects/owatcom/libpng.wpj 2011-12-03 20:19:19.000000000 -0600 @@ -6,9 +6,9 @@ WRect 256 0 8960 -9284 +9294 2 MProject 3 MCommand @@ -24,9 +24,9 @@ 4 MCommand 19 @type pngconfig.inf -3 +4 5 WFileName 10 libpng.tgt @@ -38,55 +38,75 @@ WFileName 12 pngvalid.tgt 8 -WVList -3 +WFileName +12 +pngstest.tgt 9 -VComponent +WVList +4 10 +VComponent +11 WRect 0 0 -5632 -4164 +5638 +4174 0 0 -11 +12 WFileName 10 libpng.tgt 0 0 -12 -VComponent 13 +VComponent +14 WRect 1280 -1540 -5632 -4164 +1550 +5638 +4174 0 0 -14 +15 WFileName 11 pngtest.tgt 0 1 -15 -VComponent 16 +VComponent +17 WRect -518 -487 -5632 -4164 +524 +497 +5638 +4174 0 0 -17 +18 WFileName 12 pngvalid.tgt 0 1 -9 +19 +VComponent +20 +WRect +2054 +2701 +5674 +4232 +0 +0 +21 +WFileName +12 +pngstest.tgt +0 +1 +19 diff -ru4NwbB libpng-1.5.13/projects/owatcom/pngstest.tgt libpng-1.6.0beta32/projects/owatcom/pngstest.tgt --- libpng-1.5.13/projects/owatcom/pngstest.tgt 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/projects/owatcom/pngstest.tgt 2012-03-18 22:26:24.787392000 -0500 @@ -0,0 +1,219 @@ +40 +targetIdent +0 +MProject +1 +MComponent +0 +2 +WString +4 +NEXE +3 +WString +5 +nc2en +1 +0 +0 +4 +MCommand +0 +5 +MCommand +1118 +pngstest --strict --log ../../contrib/pngsuite/basn0g01.png ../../contrib/pngsuite/basn0g02.png ../../contrib/pngsuite/basn0g04.png ../../contrib/pngsuite/basn0g08.png ../../contrib/pngsuite/basn0g16.png ../../contrib/pngsuite/basn2c08.png ../../contrib/pngsuite/basn2c16.png ../../contrib/pngsuite/basn3p01.png ../../contrib/pngsuite/basn3p02.png ../../contrib/pngsuite/basn3p04.png ../../contrib/pngsuite/basn3p08.png ../../contrib/pngsuite/basn4a08.png ../../contrib/pngsuite/basn4a16.png ../../contrib/pngsuite/basn6a08.png ../../contrib/pngsuite/basn6a16.png ../../contrib/pngsuite/ftbbn0g04.png ../../contrib/pngsuite/ftbbn0g01.png ../../contrib/pngsuite/ftbbn0g02.png ../../contrib/pngsuite/ftbbn2c16.png ../../contrib/pngsuite/ftbbn3p08.png ../../contrib/pngsuite/ftbgn2c16.png ../../contrib/pngsuite/ftbgn3p08.png ../../contrib/pngsuite/ftbrn2c08.png ../../contrib/pngsuite/ftbwn0g16.png ../../contrib/pngsuite/ftbwn3p08.png ../../contrib/pngsuite/ftbyn3p08.png ../../contrib/pngsuite/ftp0n0g08.png ../../contrib/pngsuite/ftp0n2c08.png ../../contrib/pngsuite/ftp0n3p08.png ../../contrib/pngsuite/ftp1n3p08.png +6 +MItem +12 +pngstest.exe +7 +WString +4 +NEXE +8 +WVList +6 +9 +MVState +10 +WString +7 +WINLINK +11 +WString +11 +?????Stack: +1 +12 +WString +4 +768k +0 +13 +MVState +14 +WString +7 +WINLINK +15 +WString +28 +?????Library directories(;): +1 +16 +WString +8 +$(%zlib) +0 +17 +MVState +18 +WString +7 +WINLINK +19 +WString +18 +?????Libraries(,): +1 +20 +WString +19 +libpng.lib zlib.lib +0 +21 +MVState +22 +WString +7 +WINLINK +23 +WString +11 +?????Stack: +0 +24 +WString +4 +768k +0 +25 +MVState +26 +WString +7 +WINLINK +27 +WString +28 +?????Library directories(;): +0 +28 +WString +8 +$(%zlib) +0 +29 +MVState +30 +WString +7 +WINLINK +31 +WString +18 +?????Libraries(,): +0 +32 +WString +19 +libpng.lib zlib.lib +0 +33 +WVList +1 +34 +ActionStates +35 +WString +4 +&Run +36 +WVList +0 +-1 +1 +1 +0 +37 +WPickList +2 +38 +MItem +3 +*.c +39 +WString +4 +COBJ +40 +WVList +2 +41 +MVState +42 +WString +3 +WCC +43 +WString +25 +n????Include directories: +1 +44 +WString +39 +"$(%zlib);$(%watcom)/h;$(%watcom)/h/nt" +0 +45 +MVState +46 +WString +3 +WCC +47 +WString +25 +n????Include directories: +0 +48 +WString +39 +"$(%zlib);$(%watcom)/h;$(%watcom)/h/nt" +0 +49 +WVList +0 +-1 +1 +1 +0 +50 +MItem +33 +..\..\contrib\libtests\pngstest.c +51 +WString +4 +COBJ +52 +WVList +0 +53 +WVList +0 +38 +1 +1 +0 diff -ru4NwbB libpng-1.5.13/projects/visualc71/README.txt libpng-1.6.0beta32/projects/visualc71/README.txt --- libpng-1.5.13/projects/visualc71/README.txt 2010-08-26 15:07:32.000000000 -0500 +++ libpng-1.6.0beta32/projects/visualc71/README.txt 2011-11-26 18:08:14.000000000 -0600 @@ -36,11 +36,11 @@ 6) Select "Build | Build Solution (Ctrl-Shift-B)" This project builds the libpng binaries as follows: -* Win32_DLL_Release\libpng15.dll DLL build -* Win32_DLL_Debug\libpng15d.dll DLL build (debug version) -* Win32_DLL_VB\libpng15vb.dll DLL build for Visual Basic, using stdcall +* Win32_DLL_Release\libpng16.dll DLL build +* Win32_DLL_Debug\libpng16d.dll DLL build (debug version) +* Win32_DLL_VB\libpng16vb.dll DLL build for Visual Basic, using stdcall * Win32_LIB_Release\libpng.lib static build * Win32_LIB_Debug\libpngd.lib static build (debug version) Notes: diff -ru4NwbB libpng-1.5.13/projects/vstudio/WARNING libpng-1.6.0beta32/projects/vstudio/WARNING --- libpng-1.5.13/projects/vstudio/WARNING 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/projects/vstudio/WARNING 2012-09-29 16:26:16.776544000 -0500 @@ -0,0 +1,27 @@ +WARNING +======= +Libpng 1.6 does not use the default run-time library when building static +library builds of libpng; instead of the shared DLL runtime it uses a static +runtime. If you need to change this make sure to change the setting on all the +relevant projects: + +libpng +zlib +all the test programs + +The runtime library settings for each build are as follows: + + Release Debug +DLL /MD /MDd +Library /MT /MTd + +NOTICE that libpng 1.5 erroneously used /MD for Debug DLL builds; if you used +the debug builds in your app and you changed your app to use /MD you will need +to change it to /MDd for libpng 1.6. + +The Visual Studio 2010 defaults for a Win32 DLL or Static Library project are +as follows: + + Release Debug +DLL /MD /MDd +Static Library /MD /MDd diff -ru4NwbB libpng-1.5.13/projects/vstudio/libpng/libpng.vcxproj libpng-1.6.0beta32/projects/vstudio/libpng/libpng.vcxproj --- libpng-1.5.13/projects/vstudio/libpng/libpng.vcxproj 2012-09-27 06:21:21.849258218 -0500 +++ libpng-1.6.0beta32/projects/vstudio/libpng/libpng.vcxproj 2012-11-25 12:40:12.726433521 -0600 @@ -62,25 +62,25 @@ false - $(ProjectName)15 + $(ProjectName)16 false - $(ProjectName)15 + $(ProjectName)16 false - $(ProjectName)15 + $(ProjectName)16 false - $(ProjectName)15 + $(ProjectName)16 Use @@ -100,14 +100,15 @@ 4996;4127 $(ZLibSrcDir);%(AdditionalIncludeDirectories) true Disabled + MultiThreadedDebugDLL Windows true zlib.lib - 15 + 16 $(OutDir) @@ -162,9 +163,9 @@ true true true zlib.lib - 15 + 16 $(OutDir) diff -ru4NwbB libpng-1.5.13/projects/vstudio/pngstest/pngstest.vcxproj libpng-1.6.0beta32/projects/vstudio/pngstest/pngstest.vcxproj --- libpng-1.5.13/projects/vstudio/pngstest/pngstest.vcxproj 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/projects/vstudio/pngstest/pngstest.vcxproj 2012-10-27 12:59:30.163926000 -0500 @@ -0,0 +1,219 @@ + + + + + Debug Library + Win32 + + + Debug + Win32 + + + Release Library + Win32 + + + Release + Win32 + + + + {277AC57F-313B-4D06-B119-A3CDB672D2FF} + Win32Proj + pngstest + + + + + Application + Unicode + + + Application + Unicode + + + Application + Unicode + + + Application + Unicode + + + + + + + + + + + + + + + + + + + false + + + + false + + + + false + + + + false + + + + + NotUsing + Level4 + false + ProgramDatabase + Disabled + EnableFastChecks + WIN32;_DEBUG;_CONSOLE;PNG_USE_DLL;%(PreprocessorDefinitions) + $(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories) + 4996;4127 + false + true + true + true + false + true + false + MultiThreadedDebugDLL + + + Console + true + libpng16.lib;zlib.lib + $(OutDir) + + + Executing libpng simplified API test program + "$(OutDir)pngstest.exe" --strict --log --touch "$(IntDir)pngstest.out" ../../../contrib/pngsuite/basn0g01.png ../../../contrib/pngsuite/basn0g02.png ../../../contrib/pngsuite/basn0g04.png ../../../contrib/pngsuite/basn0g08.png ../../../contrib/pngsuite/basn0g16.png ../../../contrib/pngsuite/basn2c08.png ../../../contrib/pngsuite/basn2c16.png ../../../contrib/pngsuite/basn3p01.png ../../../contrib/pngsuite/basn3p02.png ../../../contrib/pngsuite/basn3p04.png ../../../contrib/pngsuite/basn3p08.png ../../../contrib/pngsuite/basn4a08.png ../../../contrib/pngsuite/basn4a16.png ../../../contrib/pngsuite/basn6a08.png ../../../contrib/pngsuite/basn6a16.png ../../../contrib/pngsuite/ftbbn0g01.png ../../../contrib/pngsuite/ftbbn0g02.png ../../../contrib/pngsuite/ftbbn0g04.png ../../../contrib/pngsuite/ftbbn2c16.png ../../../contrib/pngsuite/ftbbn3p08.png ../../../contrib/pngsuite/ftbgn2c16.png ../../../contrib/pngsuite/ftbgn3p08.png ../../../contrib/pngsuite/ftbrn2c08.png ../../../contrib/pngsuite/ftbwn0g16.png ../../../contrib/pngsuite/ftbwn3p08.png ../../../contrib/pngsuite/ftbyn3p08.png ../../../contrib/pngsuite/ftp0n0g08.png ../../../contrib/pngsuite/ftp0n2c08.png ../../../contrib/pngsuite/ftp0n3p08.png ../../../contrib/pngsuite/ftp1n3p08.png + $(IntDir)pngstest.out + $(OutDir)pngstest.exe + + + + + NotUsing + Level4 + false + ProgramDatabase + Disabled + EnableFastChecks + MultiThreadedDebug + WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions) + $(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories) + 4996;4127 + false + true + true + true + false + true + false + + + Console + true + libpng16.lib;zlib.lib + $(OutDir) + + + Executing libpng simplified API test program + "$(OutDir)pngstest.exe" --strict --log --touch "$(IntDir)pngstest.out" ../../../contrib/pngsuite/basn0g01.png ../../../contrib/pngsuite/basn0g02.png ../../../contrib/pngsuite/basn0g04.png ../../../contrib/pngsuite/basn0g08.png ../../../contrib/pngsuite/basn0g16.png ../../../contrib/pngsuite/basn2c08.png ../../../contrib/pngsuite/basn2c16.png ../../../contrib/pngsuite/basn3p01.png ../../../contrib/pngsuite/basn3p02.png ../../../contrib/pngsuite/basn3p04.png ../../../contrib/pngsuite/basn3p08.png ../../../contrib/pngsuite/basn4a08.png ../../../contrib/pngsuite/basn4a16.png ../../../contrib/pngsuite/basn6a08.png ../../../contrib/pngsuite/basn6a16.png ../../../contrib/pngsuite/ftbbn0g01.png ../../../contrib/pngsuite/ftbbn0g02.png ../../../contrib/pngsuite/ftbbn0g04.png ../../../contrib/pngsuite/ftbbn2c16.png ../../../contrib/pngsuite/ftbbn3p08.png ../../../contrib/pngsuite/ftbgn2c16.png ../../../contrib/pngsuite/ftbgn3p08.png ../../../contrib/pngsuite/ftbrn2c08.png ../../../contrib/pngsuite/ftbwn0g16.png ../../../contrib/pngsuite/ftbwn3p08.png ../../../contrib/pngsuite/ftbyn3p08.png ../../../contrib/pngsuite/ftp0n0g08.png ../../../contrib/pngsuite/ftp0n2c08.png ../../../contrib/pngsuite/ftp0n3p08.png ../../../contrib/pngsuite/ftp1n3p08.png + $(IntDir)pngstest.out + $(OutDir)pngstest.exe + + + + + Level4 + NotUsing + ProgramDatabase + Full + false + true + WIN32;NDEBUG;_CONSOLE;PNG_USE_DLL;%(PreprocessorDefinitions) + $(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories) + 4996;4127 + false + true + true + false + true + true + false + + + Console + true + true + true + libpng16.lib;zlib.lib + $(OutDir) + UseLinkTimeCodeGeneration + + + Executing libpng simplified API test program + "$(OutDir)pngstest.exe" --strict --log --touch "$(IntDir)pngstest.out" ../../../contrib/pngsuite/basn0g01.png ../../../contrib/pngsuite/basn0g02.png ../../../contrib/pngsuite/basn0g04.png ../../../contrib/pngsuite/basn0g08.png ../../../contrib/pngsuite/basn0g16.png ../../../contrib/pngsuite/basn2c08.png ../../../contrib/pngsuite/basn2c16.png ../../../contrib/pngsuite/basn3p01.png ../../../contrib/pngsuite/basn3p02.png ../../../contrib/pngsuite/basn3p04.png ../../../contrib/pngsuite/basn3p08.png ../../../contrib/pngsuite/basn4a08.png ../../../contrib/pngsuite/basn4a16.png ../../../contrib/pngsuite/basn6a08.png ../../../contrib/pngsuite/basn6a16.png ../../../contrib/pngsuite/ftbbn0g01.png ../../../contrib/pngsuite/ftbbn0g02.png ../../../contrib/pngsuite/ftbbn0g04.png ../../../contrib/pngsuite/ftbbn2c16.png ../../../contrib/pngsuite/ftbbn3p08.png ../../../contrib/pngsuite/ftbgn2c16.png ../../../contrib/pngsuite/ftbgn3p08.png ../../../contrib/pngsuite/ftbrn2c08.png ../../../contrib/pngsuite/ftbwn0g16.png ../../../contrib/pngsuite/ftbwn3p08.png ../../../contrib/pngsuite/ftbyn3p08.png ../../../contrib/pngsuite/ftp0n0g08.png ../../../contrib/pngsuite/ftp0n2c08.png ../../../contrib/pngsuite/ftp0n3p08.png ../../../contrib/pngsuite/ftp1n3p08.png + $(IntDir)pngstest.out + $(OutDir)pngstest.exe + + + + + Level4 + NotUsing + ProgramDatabase + Full + MultiThreaded + false + true + WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions) + $(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories) + 4996;4127 + false + true + true + false + true + true + false + + + Console + true + true + true + libpng16.lib;zlib.lib + $(OutDir) + UseLinkTimeCodeGeneration + + + Executing libpng simplified API test program + "$(OutDir)pngstest.exe" --strict --log --touch "$(IntDir)pngstest.out" ../../../contrib/pngsuite/basn0g01.png ../../../contrib/pngsuite/basn0g02.png ../../../contrib/pngsuite/basn0g04.png ../../../contrib/pngsuite/basn0g08.png ../../../contrib/pngsuite/basn0g16.png ../../../contrib/pngsuite/basn2c08.png ../../../contrib/pngsuite/basn2c16.png ../../../contrib/pngsuite/basn3p01.png ../../../contrib/pngsuite/basn3p02.png ../../../contrib/pngsuite/basn3p04.png ../../../contrib/pngsuite/basn3p08.png ../../../contrib/pngsuite/basn4a08.png ../../../contrib/pngsuite/basn4a16.png ../../../contrib/pngsuite/basn6a08.png ../../../contrib/pngsuite/basn6a16.png ../../../contrib/pngsuite/ftbbn0g01.png ../../../contrib/pngsuite/ftbbn0g02.png ../../../contrib/pngsuite/ftbbn0g04.png ../../../contrib/pngsuite/ftbbn2c16.png ../../../contrib/pngsuite/ftbbn3p08.png ../../../contrib/pngsuite/ftbgn2c16.png ../../../contrib/pngsuite/ftbgn3p08.png ../../../contrib/pngsuite/ftbrn2c08.png ../../../contrib/pngsuite/ftbwn0g16.png ../../../contrib/pngsuite/ftbwn3p08.png ../../../contrib/pngsuite/ftbyn3p08.png ../../../contrib/pngsuite/ftp0n0g08.png ../../../contrib/pngsuite/ftp0n2c08.png ../../../contrib/pngsuite/ftp0n3p08.png ../../../contrib/pngsuite/ftp1n3p08.png + $(IntDir)pngstest.out + $(OutDir)pngstest.exe + + + + + + + + + diff -ru4NwbB libpng-1.5.13/projects/vstudio/pngtest/pngtest.vcxproj libpng-1.6.0beta32/projects/vstudio/pngtest/pngtest.vcxproj --- libpng-1.5.13/projects/vstudio/pngtest/pngtest.vcxproj 2012-09-27 06:21:21.860079076 -0500 +++ libpng-1.6.0beta32/projects/vstudio/pngtest/pngtest.vcxproj 2012-11-25 12:40:12.737391484 -0600 @@ -90,13 +90,14 @@ true false true false + MultiThreadedDebugDLL Console true - libpng15.lib + libpng16.lib $(OutDir) Executing PNG test program @@ -127,9 +128,9 @@ Console true - libpng15.lib;zlib.lib + libpng16.lib;zlib.lib $(OutDir) Executing PNG test program @@ -162,9 +163,9 @@ true true true UseLinkTimeCodeGeneration - libpng15.lib + libpng16.lib $(OutDir) Executing PNG test program @@ -197,9 +198,9 @@ Console true true true - libpng15.lib;zlib.lib + libpng16.lib;zlib.lib UseLinkTimeCodeGeneration $(OutDir) diff -ru4NwbB libpng-1.5.13/projects/vstudio/pngunknown/pngunknown.vcxproj libpng-1.6.0beta32/projects/vstudio/pngunknown/pngunknown.vcxproj --- libpng-1.5.13/projects/vstudio/pngunknown/pngunknown.vcxproj 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/projects/vstudio/pngunknown/pngunknown.vcxproj 2012-11-25 12:40:12.748263795 -0600 @@ -0,0 +1,219 @@ + + + + + Debug Library + Win32 + + + Debug + Win32 + + + Release Library + Win32 + + + Release + Win32 + + + + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC} + Win32Proj + pngunknown + + + + + Application + Unicode + + + Application + Unicode + + + Application + Unicode + + + Application + Unicode + + + + + + + + + + + + + + + + + + + false + + + + false + + + + false + + + + false + + + + + NotUsing + Level4 + false + ProgramDatabase + Disabled + EnableFastChecks + WIN32;_DEBUG;_CONSOLE;PNG_USE_DLL;%(PreprocessorDefinitions) + $(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories) + 4996;4127 + false + true + true + true + false + true + false + MultiThreadedDebugDLL + + + Console + true + libpng16.lib;zlib.lib + $(OutDir) + + + Executing PNG validation program + "$(OutDir)pngunknown.exe" --strict --default --touch "$(IntDir)pngunknown.out" ../../../pngtest.png + $(IntDir)pngunknown.out + $(OutDir)pngunknown.exe + + + + + NotUsing + Level4 + false + ProgramDatabase + Disabled + EnableFastChecks + MultiThreadedDebug + WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions) + $(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories) + 4996;4127 + false + true + true + true + false + true + false + + + Console + true + libpng16.lib;zlib.lib + $(OutDir) + + + Executing PNG validation program + "$(OutDir)pngunknown.exe" --strict --default --touch "$(IntDir)pngunknown.out" ../../../pngtest.png + $(IntDir)pngunknown.out + $(OutDir)pngunknown.exe + + + + + Level4 + NotUsing + ProgramDatabase + Full + false + true + WIN32;NDEBUG;_CONSOLE;PNG_USE_DLL;%(PreprocessorDefinitions) + $(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories) + 4996;4127 + false + true + true + false + true + true + false + + + Console + true + true + true + libpng16.lib;zlib.lib + $(OutDir) + UseLinkTimeCodeGeneration + + + Executing PNG validation program + "$(OutDir)pngunknown.exe" --strict --default --touch "$(IntDir)pngunknown.out" ../../../pngtest.png + $(IntDir)pngunknown.out + $(OutDir)pngunknown.exe + + + + + Level4 + NotUsing + ProgramDatabase + Full + MultiThreaded + false + true + WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions) + $(ZLibSrcDir);..\..\..\scripts;%(AdditionalIncludeDirectories) + 4996;4127 + false + true + true + false + true + true + false + + + Console + true + true + true + libpng16.lib;zlib.lib + $(OutDir) + UseLinkTimeCodeGeneration + + + Executing PNG validation program + "$(OutDir)pngunknown.exe" --strict --default --touch "$(IntDir)pngunknown.out" ../../../pngtest.png + $(IntDir)pngunknown.out + $(OutDir)pngunknown.exe + + + + + + + + + diff -ru4NwbB libpng-1.5.13/projects/vstudio/pngvalid/pngvalid.vcxproj libpng-1.6.0beta32/projects/vstudio/pngvalid/pngvalid.vcxproj --- libpng-1.5.13/projects/vstudio/pngvalid/pngvalid.vcxproj 2012-09-27 06:21:21.871031988 -0500 +++ libpng-1.6.0beta32/projects/vstudio/pngvalid/pngvalid.vcxproj 2012-11-25 12:40:12.759257690 -0600 @@ -90,13 +90,14 @@ true false true false + MultiThreadedDebugDLL Console true - libpng15.lib;zlib.lib + libpng16.lib;zlib.lib $(OutDir) Executing PNG validation program @@ -127,9 +128,9 @@ Console true - libpng15.lib;zlib.lib + libpng16.lib;zlib.lib $(OutDir) Executing PNG validation program @@ -161,9 +162,9 @@ Console true true true - libpng15.lib;zlib.lib + libpng16.lib;zlib.lib $(OutDir) UseLinkTimeCodeGeneration @@ -197,9 +198,9 @@ Console true true true - libpng15.lib;zlib.lib + libpng16.lib;zlib.lib $(OutDir) UseLinkTimeCodeGeneration diff -ru4NwbB libpng-1.5.13/projects/vstudio/readme.txt libpng-1.6.0beta32/projects/vstudio/readme.txt --- libpng-1.5.13/projects/vstudio/readme.txt 2012-09-27 06:21:21.829484553 -0500 +++ libpng-1.6.0beta32/projects/vstudio/readme.txt 2012-11-25 12:40:12.706183582 -0600 @@ -32,16 +32,16 @@ Linking your application ======================== Normally you should link against the 'release' configuration. This builds a -DLL for libpng 1.5 with the default runtime options used by Visual Studio -2010. In particular the runtime library is the "MultiThreaded DLL" version. +DLL for libpng with the default runtime options used by Visual Studio 2010. +In particular the runtime library is the "MultiThreaded DLL" version. If you use Visual Studio defaults to build your application you will have no problems. If you don't use the Visual Studio defaults your application must still be built with the default runtime option (/MD). If, for some reason, it is not then your -application will crash inside libpng15.dll as soon as libpng tries to read +application will crash inside libpng16.dll as soon as libpng tries to read from a file handle you pass in. If you do not want to use the DLL, for example for a very small application, the 'release library' configuration may be more appropriate. This is built @@ -57,8 +57,9 @@ =================================== This solution includes limited support for debug versions of libpng. You do not need these unless your own solution itself uses debug builds (it is far more effective to debug on the release builds, there is no point building -a special debug build.) +a special debug build unless you have heap corruption problems that you can't +track down.) The debug build of libpng is minimally supported. Support for debug builds of zlib is also minimal. You really don't want to do this. diff -ru4NwbB libpng-1.5.13/projects/vstudio/vstudio.sln libpng-1.6.0beta32/projects/vstudio/vstudio.sln --- libpng-1.5.13/projects/vstudio/vstudio.sln 2011-11-23 09:00:02.985074000 -0600 +++ libpng-1.6.0beta32/projects/vstudio/vstudio.sln 2012-09-30 06:50:43.226807000 -0500 @@ -1,6 +1,10 @@ Microsoft Visual Studio Solution File, Format Version 11.00 # Visual Studio 2010 +Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlib", "zlib\zlib.vcxproj", "{60F89955-91C6-3A36-8000-13C592FEC2DF}" +EndProject +Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pnglibconf", "pnglibconf\pnglibconf.vcxproj", "{EB33566E-DA7F-4D28-9077-88C0B7C77E35}" +EndProject Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "libpng", "libpng\libpng.vcxproj", "{D6973076-9317-4EF2-A0B8-B7A18AC0713E}" ProjectSection(ProjectDependencies) = postProject {60F89955-91C6-3A36-8000-13C592FEC2DF} = {60F89955-91C6-3A36-8000-13C592FEC2DF} {EB33566E-DA7F-4D28-9077-88C0B7C77E35} = {EB33566E-DA7F-4D28-9077-88C0B7C77E35} @@ -12,18 +16,28 @@ {EB33566E-DA7F-4D28-9077-88C0B7C77E35} = {EB33566E-DA7F-4D28-9077-88C0B7C77E35} {D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {D6973076-9317-4EF2-A0B8-B7A18AC0713E} EndProjectSection EndProject -Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "zlib", "zlib\zlib.vcxproj", "{60F89955-91C6-3A36-8000-13C592FEC2DF}" -EndProject Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pngvalid", "pngvalid\pngvalid.vcxproj", "{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}" ProjectSection(ProjectDependencies) = postProject {60F89955-91C6-3A36-8000-13C592FEC2DF} = {60F89955-91C6-3A36-8000-13C592FEC2DF} {EB33566E-DA7F-4D28-9077-88C0B7C77E35} = {EB33566E-DA7F-4D28-9077-88C0B7C77E35} {D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {D6973076-9317-4EF2-A0B8-B7A18AC0713E} EndProjectSection EndProject -Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pnglibconf", "pnglibconf\pnglibconf.vcxproj", "{EB33566E-DA7F-4D28-9077-88C0B7C77E35}" +Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pngstest", "pngstest\pngstest.vcxproj", "{277AC57F-313B-4D06-B119-A3CDB672D2FF}" + ProjectSection(ProjectDependencies) = postProject + {60F89955-91C6-3A36-8000-13C592FEC2DF} = {60F89955-91C6-3A36-8000-13C592FEC2DF} + {EB33566E-DA7F-4D28-9077-88C0B7C77E35} = {EB33566E-DA7F-4D28-9077-88C0B7C77E35} + {D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {D6973076-9317-4EF2-A0B8-B7A18AC0713E} + EndProjectSection +EndProject +Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "pngunknown", "pngunknown\pngunknown.vcxproj", "{C5D3156C-8C8C-4936-B35F-2B829BA36FEC}" + ProjectSection(ProjectDependencies) = postProject + {60F89955-91C6-3A36-8000-13C592FEC2DF} = {60F89955-91C6-3A36-8000-13C592FEC2DF} + {EB33566E-DA7F-4D28-9077-88C0B7C77E35} = {EB33566E-DA7F-4D28-9077-88C0B7C77E35} + {D6973076-9317-4EF2-A0B8-B7A18AC0713E} = {D6973076-9317-4EF2-A0B8-B7A18AC0713E} + EndProjectSection EndProject Global GlobalSection(SolutionConfigurationPlatforms) = preSolution Debug Library|Win32 = Debug Library|Win32 @@ -79,8 +93,16 @@ {277AC57F-313B-4D06-B119-A3CDB672D2FF}.Release Library|Win32.ActiveCfg = Release Library|Win32 {277AC57F-313B-4D06-B119-A3CDB672D2FF}.Release Library|Win32.Build.0 = Release Library|Win32 {277AC57F-313B-4D06-B119-A3CDB672D2FF}.Release|Win32.ActiveCfg = Release|Win32 {277AC57F-313B-4D06-B119-A3CDB672D2FF}.Release|Win32.Build.0 = Release|Win32 + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC}.Debug Library|Win32.ActiveCfg = Debug Library|Win32 + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC}.Debug Library|Win32.Build.0 = Debug Library|Win32 + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC}.Debug|Win32.ActiveCfg = Debug|Win32 + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC}.Debug|Win32.Build.0 = Debug|Win32 + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC}.Release Library|Win32.ActiveCfg = Release Library|Win32 + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC}.Release Library|Win32.Build.0 = Release Library|Win32 + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC}.Release|Win32.ActiveCfg = Release|Win32 + {C5D3156C-8C8C-4936-B35F-2B829BA36FEC}.Release|Win32.Build.0 = Release|Win32 EndGlobalSection GlobalSection(SolutionProperties) = preSolution HideSolutionNode = FALSE EndGlobalSection diff -ru4NwbB libpng-1.5.13/projects/vstudio/zlib/zlib.vcxproj libpng-1.6.0beta32/projects/vstudio/zlib/zlib.vcxproj --- libpng-1.5.13/projects/vstudio/zlib/zlib.vcxproj 2011-08-16 19:34:41.000000000 -0500 +++ libpng-1.6.0beta32/projects/vstudio/zlib/zlib.vcxproj 2012-10-27 12:59:30.189841000 -0500 @@ -31,9 +31,11 @@ + {60F89955-91C6-3A36-8000-13C592FEC2DF} Win32Proj + zlib @@ -83,14 +85,15 @@ true - WIN32;_DEBUG;_WINDOWS;%(PreprocessorDefinitions) + WIN32;_DEBUG;_WINDOWS;Z_SOLO;%(PreprocessorDefinitions) MultiThreadedDebug TurnOffAllWarnings ProgramDatabase Disabled true + true MachineX86 true @@ -98,13 +101,15 @@ - WIN32;_DEBUG;_WINDOWS;%(PreprocessorDefinitions) + WIN32;_DEBUG;_WINDOWS;Z_SOLO;%(PreprocessorDefinitions) TurnOffAllWarnings ProgramDatabase Disabled true + true + MultiThreadedDebugDLL MachineX86 true @@ -122,8 +127,9 @@ true true true MultiThreaded + WIN32;NDEBUG;_WINDOWS;Z_SOLO;%(PreprocessorDefinitions) MachineX86 true @@ -143,32 +149,21 @@ false true true true + WIN32;NDEBUG;_WINDOWS;Z_SOLO;%(PreprocessorDefinitions) MachineX86 true Windows + true + true true - - - WIN32;NDEBUG;_WINDOWS;%(PreprocessorDefinitions) - Level3 - ProgramDatabase - - - MachineX86 - true - Windows - true - true - - diff -ru4NwbB libpng-1.5.13/scripts/README.txt libpng-1.6.0beta32/scripts/README.txt --- libpng-1.5.13/scripts/README.txt 2012-09-27 06:21:21.377840923 -0500 +++ libpng-1.6.0beta32/scripts/README.txt 2012-11-25 12:40:12.114982712 -0600 @@ -14,10 +14,9 @@ makefile.atari => Atari makefile makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode) makefile.beos => beos makefile makefile.bor => Borland makefile (uses bcc) - makefile.cegcc => minge32ce for Windows CE makefile (only included in the - tar distributions, because it depends on "configure") + makefile.cegcc => minge32ce for Windows CE makefile makefile.darwin => Darwin makefile, can use on MacosX makefile.dec => DEC Alpha UNIX makefile makefile.dj2 => DJGPP 2 makefile makefile.elf => Linux/ELF makefile symbol versioning, @@ -58,9 +57,9 @@ libpng-config-body.in => used by several makefiles to create libpng-config libpng-config-head.in => used by several makefiles to create libpng-config libpng.pc.in => Used by several makefiles to create libpng.pc %14% pngwin.rc => Used by the visualc6 and visualc71 projects. - pngwin.rc => Used by the visualc71 and vstudio projects. + pngwin.rc => Used by the visualc71 project. pngwin.def => Used by makefile.os2 pngwin.dfn => Used to maintain pngwin.def SCOPTIONS.ppc => Used with smakefile.ppc @@ -73,6 +72,16 @@ symbols.def => Used for symbol versioning symbols.dfn => Used for symbol versioning vers.dfn => Used for symbol versioning + libtool.m4 => Used by autoconf tools + ltoptions.m4 => Used by autoconf tools + ltsugar.m4 => Used by autoconf tools + ltversion.m4 => Used by autoconf tools + lt~obsolete.m4 => Used by autoconf tools + + intprefix.dfn => Used by autoconf tools + macro.lst => Used by autoconf tools + prefix.dfn => Used by autoconf tools + Further information can be found in comments in the individual makefiles. diff -ru4NwbB libpng-1.5.13/scripts/checksym.awk libpng-1.6.0beta32/scripts/checksym.awk --- libpng-1.5.13/scripts/checksym.awk 2010-12-07 14:33:57.000000000 -0600 +++ libpng-1.6.0beta32/scripts/checksym.awk 2011-12-08 09:08:52.000000000 -0600 @@ -4,10 +4,11 @@ # # awk -f checksym.awk official-def list-to-check # # Output is a file in the current directory called 'symbols.new', -# stdout holds error messages. Error code indicates success or -# failure. +# the value of the awk variable "of" (which can be changed on the +# command line if required.) stdout holds error messages. Error +# code indicates success or failure. # # NOTE: this is a pure, old fashioned, awk script. It will # work with any awk @@ -20,8 +21,9 @@ lasto = 0 # last ordinal value from png.h mastero = 0 # highest ordinal in master file symbolo = 0 # highest ordinal in png.h missing = "error"# log an error on missing symbols + of="symbols.new" # default to a fixed name } # Read existing definitions from the master file (the first # file on the command line.) This must be a def file and it @@ -150,12 +152,12 @@ } # Finally generate symbols.new if (symbol[o] != "") - print " " symbol[o], "@" o > "symbols.new" + print " " symbol[o], "@" o > of } if (err != 0) { - print "*** A new list is in symbols.new ***" + print "*** A new list is in", of, "***" exit 1 } } diff -ru4NwbB libpng-1.5.13/scripts/chkfmt libpng-1.6.0beta32/scripts/chkfmt --- libpng-1.5.13/scripts/chkfmt 2010-08-18 19:47:32.000000000 -0500 +++ libpng-1.6.0beta32/scripts/chkfmt 1969-12-31 18:00:00.000000000 -0600 @@ -1,137 +0,0 @@ -#!/bin/sh -# -# Check the format of the source files in the current directory - checks for a -# line length of 80 characters max and no tab characters. -# -# Optionally arguments are files or directories to check. -# -# -v: output the long lines (makes fixing them easier) -# -e: spawn an editor for each file that needs a change ($EDITOR must be -# defined). When using -e the script MUST be run from an interactive -# command line. -verbose= -edit= -vers= -test "$1" = "-v" && { - shift - verbose=yes -} -test "$1" = "-e" && { - shift - if test -n "$EDITOR" - then - edit=yes - - # Copy the standard streams for the editor - exec 3>&0 4>&1 5>&2 - else - echo "chkfmt -e: EDITOR must be defined" >&2 - exit 1 - fi -} - -# Function to edit a single file - if the file isn't changed ask the user -# whether or not to continue. This stuff only works if the script is run from -# the command line (otherwise, don't specify -e or you will be sorry). -doed(){ - cp "$file" "$file".orig - "$EDITOR" "$file" 0>&3 1>&4 2>&5 3>&- 4>&- 5>&- || exit 1 - if cmp -s "$file".orig "$file" - then - rm "$file".orig - echo -n "$file: file not changed, type anything to continue: " >&5 - read ans 0>&3 - test -n "$ans" || return 1 - fi - return 0 -} - -# In beta versions the version string which appears in files can be a little -# long and cause spuriously overlong lines. To avoid this subtitute the version -# string with a 'standard' version a.b.cc before checking for long lines. -if test -r png.h -then - vers="`sed -n -e \ - 's/^#define PNG_LIBPNG_VER_STRING .\([0-9]\.[0-9]\.[0-9][0-9a-z]*\).$/\1/p' \ - png.h`" - echo "chkfmt: checking version $vers" -fi -if test -z "$vers" -then - echo "chkfmt: png.h not found, ignoring version number" >&2 -fi - -test -n "$1" || set -- . -find "$@" \( -type d \( -name '.git' -o -name '.libs' -o -name 'projects' \) \ - -prune \) -o \( -type f \ - ! -name '*.[oa]' ! -name '*.l[oa]' ! -name '*.png' ! -name '*.out' \ - ! -name '*.jpg' ! -name '*.patch' ! -name '*.obj' ! -name '*.exe' \ - ! -name '*.com' ! -name '*.tar.*' ! -name '*.zip' ! -name '*.ico' \ - ! -name '*.res' ! -name '*.rc' ! -name '*.mms' ! -name '*.rej' \ - ! -name '*.dsp' ! -name '*.orig' ! -name '*.dfn' ! -name '*.swp' \ - ! -name '~*' ! -name '*.3' \ - ! -name 'missing' ! -name 'mkinstalldirs' ! -name 'depcomp' \ - ! -name 'aclocal.m4' ! -name 'install-sh' ! -name 'Makefile.in' \ - ! -name 'ltmain.sh' ! -name 'config*' -print \) | { - st=0 - while read file - do - case "$file" in - *.mak|*[Mm]akefile.*|*[Mm]akefile) - # Makefiles require tabs, dependency lines can be this long. - check_tabs= - line_length=100;; - *.awk) - # Includes literal tabs - check_tabs= - # The following is arbitrary - line_length=132;; - *contrib/*/*.[ch]) - check_tabs=yes - line_length=96;; - *) - check_tabs=yes - line_length=80;; - esac - - # Note that vers can only contain 0-9, . and a-z - if test -n "$vers" - then - sed -e "s/$vers/a.b.cc/g" "$file" >"$file".$$ - else - cp "$file" "$file".$$ - fi - splt="`fold -$line_length "$file".$$ | diff -c "$file".$$ -`" - rm "$file".$$ - - if test -n "$splt" - then - echo "$file: lines too long" - st=1 - if test -n "$EDITOR" -a -n "$edit" - then - doed "$file" || exit 1 - elif test -n "$verbose" - then - echo "$splt" - fi - fi - if test -n "$check_tabs" - then - tab="`tr -c -d '\t' <"$file"`" - if test -n "$tab" - then - echo "$file: file contains tab characters" - st=1 - if test -n "$EDITOR" -a -n "$edit" - then - doed "$file" || exit 1 - elif test -n "$verbose" - then - echo "$splt" - fi - fi - fi - done - exit $st -} diff -ru4NwbB libpng-1.5.13/scripts/intprefix.dfn libpng-1.6.0beta32/scripts/intprefix.dfn --- libpng-1.5.13/scripts/intprefix.dfn 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/scripts/intprefix.dfn 2012-01-31 20:27:16.000000000 -0600 @@ -0,0 +1,19 @@ + +/* intprefix.dfn - generate an unprefixed internal symbol list + * + * Last changed in libpng version 1.6.0 [January 30, 2012] + * Copyright (c) 2012 Glenn Randers-Pehrson + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +#define PNG_INTERNAL_DATA(type, name, array)\ + PNG_DEFN_MAGIC-name-PNG_DEFN_END + +#define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ + PNG_DEFN_MAGIC-name-PNG_DEFN_END + +#define PNGPREFIX_H /* self generation */ +#include "../pngpriv.h" diff -ru4NwbB libpng-1.5.13/scripts/macro.lst libpng-1.6.0beta32/scripts/macro.lst --- libpng-1.5.13/scripts/macro.lst 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/scripts/macro.lst 2012-01-31 07:18:25.000000000 -0600 @@ -0,0 +1,3 @@ +get_uint_32(buf) +get_uint_16(buf) +get_int_32(buf) diff -ru4NwbB libpng-1.5.13/scripts/makefile.freebsd libpng-1.6.0beta32/scripts/makefile.freebsd --- libpng-1.5.13/scripts/makefile.freebsd 2012-09-27 06:21:21.531069128 -0500 +++ libpng-1.6.0beta32/scripts/makefile.freebsd 2012-11-25 12:40:12.343407838 -0600 @@ -26,9 +26,9 @@ libpng/pngconf.h ${INCSDIR}/../pngconf.h \ libpng/pnglibconf.h ${INCSDIR}/../pnglibconf.h LDADD+= -lm -lz -#LDADD+= -lm -lz -lssp_nonshared # for OSVERSION >= 800000 ? +#LDADD+= -lm -lz -lssp_nonshared # for OSVERSION < 800000 ? DPADD+= ${LIBM} ${LIBZ} CFLAGS+= -I. diff -ru4NwbB libpng-1.5.13/scripts/options.awk libpng-1.6.0beta32/scripts/options.awk --- libpng-1.5.13/scripts/options.awk 2012-02-24 19:17:05.386605000 -0600 +++ libpng-1.6.0beta32/scripts/options.awk 2012-03-21 07:46:23.193589000 -0500 @@ -41,9 +41,9 @@ cx= "/" ct "*" # Open C comment for output file comment=start cx # Comment start cend="*/" end # Comment end def=start "#define PNG_" ct # Arbitrary define - sup=ct "_SUPPORTED 1" end # end supported option + sup=ct "_SUPPORTED" end # end supported option und=comment "#undef PNG_" ct # Unsupported option une=ct "_SUPPORTED" cend # end unsupported option error=start "ERROR:" # error message @@ -285,25 +285,26 @@ } # Else fall through to the error handler } -# chunk NAME [requires OPT] [on|off|disabled] +# chunk NAME [requires OPT] [enables LIST] [on|off|disabled] # Expands to the 'option' settings appropriate to the reading and # writing of an ancilliary PNG chunk 'NAME': # # option READ_NAME requires READ_ANCILLARY_CHUNKS [READ_OPT] -# option READ_NAME enables NAME +# option READ_NAME enables NAME LIST # [option READ_NAME off] # option WRITE_NAME requires WRITE_ANCILLARY_CHUNKS [WRITE_OPT] -# option WRITE_NAME enables NAME +# option WRITE_NAME enables NAME LIST # [option WRITE_NAME off] pre != 0 && $1 == "chunk" && NF >= 2{ # 'chunk' is handled on the first pass by writing appropriate # 'option' lines into the intermediate file. onoff = "" reqread = "" reqwrite = "" + enables = "" i = 3 # indicates format error if (NF > 2) { # read the keywords/additional OPTS req = 0 @@ -314,23 +315,27 @@ onoff = $(i) else break # on/off conflict } + req = 0 } else if ($(i) == "requires") req = 1 - else if (req != 1) - break # bad line: handled below - else { + else if ($(i) == "enables") + req = 2 + else if (req == 1){ reqread = reqread " READ_" $(i) reqwrite = reqwrite " WRITE_" $(i) - } + } else if (req == 2) + enables = enables " " $(i) + else + break # bad line: handled below } } if (i > NF) { # Output new 'option' lines to the intermediate file (out) - print "option READ_" $2, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", $2, onoff >out - print "option WRITE_" $2, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", $2, onoff >out + print "option READ_" $2, "requires READ_ANCILLARY_CHUNKS" reqread, "enables", $2 enables , onoff >out + print "option WRITE_" $2, "requires WRITE_ANCILLARY_CHUNKS" reqwrite, "enables", $2 enables, onoff >out next } # Else hit the error handler below - bad line format! } diff -ru4NwbB libpng-1.5.13/scripts/pnglibconf.dfa libpng-1.6.0beta32/scripts/pnglibconf.dfa --- libpng-1.5.13/scripts/pnglibconf.dfa 2012-06-09 10:05:26.382679000 -0500 +++ libpng-1.6.0beta32/scripts/pnglibconf.dfa 2012-11-25 12:40:12.634535439 -0600 @@ -23,18 +23,22 @@ # that can *only* be specified during the libpng build; # pnglibconf.h freezes the definitions selected for the specific # build. # -# The syntax is detailed in scripts/options.awk, this is a summary +# The syntax is detailed in scripts/options.awk; this is a summary # only: # # setting [default] # #define PNG_ /* value comes from current setting */ # option [requires ...] [if ...] [enables ...] [disabled] # #define PNG__SUPPORTED if the requirements are met and # enable the other options listed -# chunk [requires ...] [disabled] -# Enable chunk processing for the given ancillary chunk +# chunk [requires ...] [enables ...] [disabled] +# Enable chunk processing for the given ancillary chunk; any +# 'requires something' expands to READ_something for read and +# WRITE_something for write, but the enables list members are +# used as given (e.g. enables GAMMA just expands to that on the +# correspond READ_name and WRITE_name lines.) # # Note that the 'on' and 'off' keywords, while valid on both option # and chunk, should not be used in this file because they force the # relevant options on or off. @@ -43,9 +47,9 @@ # The following setting, option and chunk values can all be changed # while building libpng: # -# setting: change 'setting' lines to fine tune library performance, +# setting: change 'setting' lines to fine tune library performance; # changes to the settings don't affect the libpng API functionally # # option: change 'option' lines to remove or add capabilities from # or to the library; options change the library API @@ -142,8 +146,14 @@ @# define PNG_API_RULE 2 /* Use Watcom calling conventions */ @# endif @#endif +# IN DEVELOPMENT +# These are currently experimental features; define them if you want (NOTE: +# experimental options must be disabled before they are defined in this file!) + +# NONE + # Note that PNG_USR_CONFIG only has an effect when building # pnglibconf.h setting USER_CONFIG @@ -160,8 +170,15 @@ # do not release shared libraries with this changed. setting API_RULE default 0 +# This allows a prefix to be added to the front of every API functon name (and +# therefore every symbol) by redefining all the function names with the prefix +# at the end of pnglibconf.h. It also turns on similar internal symbol renaming +# by causing a similar build-time only file, pngprefix.h, to be generated. + +setting PREFIX + # Default to using the read macros setting DEFAULT_READ_MACROS default 1 @@ -178,12 +195,38 @@ option WRITE_INT_FUNCTIONS disabled option WRITE enables WRITE_INT_FUNCTIONS -# Generic options - affect both read and write. +# Error controls +# +# WARNINGS: normally on, if off no warnings are generated +# ERROR_TEXT: normally on, if off errors happen but there is no message +# ERROR_NUMBERS: unimplemented feature, therefore disabled +# BENIGN_ERRORS: support for just issuing warnings for recoverable errors +# +# BENIGN_READ_ERRORS: +# By default recoverable errors on read should just generate warnings, +# generally safe but PNG files that don't conform to the specification will +# be accepted if a meaningful result can be produced. +# +# BENIGN_WRITE_ERRORS: +# By default recoverable errors on write should just generate warnings, +# not generally safe because this allows the application to write invalid +# PNG files. Applications should enable this themselves; it's useful +# because it means that a failure to write an ancilliary chunk can often be +# ignored. option WARNINGS +option ERROR_TEXT +option ERROR_NUMBERS disabled + option BENIGN_ERRORS +option BENIGN_WRITE_ERRORS requires BENIGN_ERRORS disabled +option BENIGN_READ_ERRORS requires BENIGN_ERRORS + + +# Generic options - affect both read and write. + option MNG_FEATURES # Arithmetic options, the first is the big switch that chooses between internal # floating and fixed point arithmetic implementations - it does not affect any @@ -192,12 +235,8 @@ option FLOATING_ARITHMETIC option FLOATING_POINT enables ok_math option FIXED_POINT enables ok_math -# Added at libpng version 1.4.0 - -option ERROR_TEXT - # The following is always on (defined empty) setting CALLOC_SUPPORTED default @@ -222,12 +261,8 @@ option SETJMP = NO_SETJMP SETJMP_NOT_SUPPORTED -# For the moment this is disabled (no code support): - -option ERROR_NUMBERS disabled - # If this is disabled it is not possible for apps to get the # values from the 'info' structure, this effectively removes # quite a lot of the READ API. @@ -289,8 +324,21 @@ # conformant, however the library that results is still non-standard. # See the comments above about how to change options and settings. # READ options +# +# WARNING: in libpng 1.5 maintained configuration compatibility with earlier +# versions. In some cases turning off an option turned off other options, in +# others it was ineffective unless dependent options were also turned off. +# Libpng 1.6 changes this: in general if you turn off an option that affects +# APIs it stays off and simply disables APIs that depend on it. +# +# As a result if you simply port the libpng 1.5 configuration to libpng 1.6 you +# will probably see build failures due to missing APIs. Fixing these failures +# requires some, perhaps considerable, knowledge of what your libpng using +# applications are doing, fortunately there is no great reason for you to move +# to libpng 1.6; the new interfaces in 1.6 will take several years to become +# popular. option READ enables READ_INTERLACING # Disabling READ_16BIT does not disable reading 16-bit PNG files, but it @@ -306,29 +354,44 @@ option READ_TRANSFORMS requires READ = NO_READ_TRANSFORMS READ_TRANSFORMS_NOT_SUPPORTED -option READ_EXPAND requires READ_TRANSFORMS -option READ_EXPAND_16 requires READ_TRANSFORMS READ_16BIT enables READ_EXPAND -option READ_SHIFT requires READ_TRANSFORMS -option READ_PACK requires READ_TRANSFORMS +# Read gamma handling. Gamma processing is a core part of libpng and many of +# the capabilities are dependent on libpng performing gamma correction. +# +# In libpng 1.6 disabling gamma processing (setting PNG_NO_READ_GAMMA) +# consistently disables those parts of the API that depend on it. Prior to +# 1.6.0 this was not true; the results were unpredictable and varied between +# releases. +# +# If you disable gamma processing and your program no longer compiles you need +# to ask whether you really need the APIs that are missing. If you do then you +# almost certainly need the gamma processing. +# +# If you handle gamma issues outside libpng then you do not need the libpng +# gamma processing; and it is an enormous waste of space. You just need to +# remove the use of libpng APIs that depend on it. +option READ_GAMMA requires READ_TRANSFORMS READ_gAMA + +option READ_ALPHA_MODE requires READ_TRANSFORMS READ_GAMMA +option READ_BACKGROUND requires READ_TRANSFORMS READ_STRIP_ALPHA READ_GAMMA option READ_BGR requires READ_TRANSFORMS -option READ_SWAP requires READ_TRANSFORMS READ_16BIT -option READ_PACKSWAP requires READ_TRANSFORMS -option READ_INVERT requires READ_TRANSFORMS -option READ_BACKGROUND requires READ_TRANSFORMS enables READ_STRIP_ALPHA -option READ_STRIP_16_TO_8 requires READ_TRANSFORMS -option READ_SCALE_16_TO_8 requires READ_TRANSFORMS +option READ_EXPAND_16 requires READ_TRANSFORMS READ_16BIT READ_EXPAND +option READ_EXPAND requires READ_TRANSFORMS option READ_FILLER requires READ_TRANSFORMS -option READ_GAMMA requires READ_TRANSFORMS enables READ_gAMA option READ_GRAY_TO_RGB requires READ_TRANSFORMS - -option READ_ALPHA_MODE requires READ_TRANSFORMS enables READ_GAMMA -option READ_SWAP_ALPHA requires READ_TRANSFORMS option READ_INVERT_ALPHA requires READ_TRANSFORMS +option READ_INVERT requires READ_TRANSFORMS +option READ_PACK requires READ_TRANSFORMS +option READ_PACKSWAP requires READ_TRANSFORMS +option READ_RGB_TO_GRAY requires READ_TRANSFORMS READ_GAMMA +option READ_SCALE_16_TO_8 requires READ_TRANSFORMS +option READ_SHIFT requires READ_TRANSFORMS +option READ_STRIP_16_TO_8 requires READ_TRANSFORMS option READ_STRIP_ALPHA requires READ_TRANSFORMS +option READ_SWAP_ALPHA requires READ_TRANSFORMS +option READ_SWAP requires READ_TRANSFORMS READ_16BIT option READ_USER_TRANSFORM requires READ_TRANSFORMS -option READ_RGB_TO_GRAY requires READ_TRANSFORMS option PROGRESSIVE_READ requires READ option SEQUENTIAL_READ requires READ @@ -350,13 +413,8 @@ # API to build a grayscale palette option BUILD_GRAYSCALE_PALETTE -# IN DEVELOPMENT -# These are currently experimental features; define them if you want - -# NOTHING HERE - # WRITE options option WRITE @@ -435,13 +493,61 @@ # These options do not affect the API but rather alter how the # API is implemented, they get recorded in pnglibconf.h, but # can't be changed by the application. -# Check the correctness of cHRM chunks +# Colorspace support (enabled as required); just the support for colorant +# information. Gamma support, likewise, is just support for the gamma +# information, READ_GAMMA is required for gamma transformations (so it +# is possible to read PNG gamma without enabling all the libpng transform +# code - do this for applications that do their own gamma processing) +# +# As of 1.6.0 COLORSPACE is only useful if the application processes the +# information; this is because the library does not do any colorspace +# processing, it just validates the data in the PNG file. + +option GAMMA disabled +option COLORSPACE enables GAMMA disabled + +# When an ICC profile is read, or png_set, it will be checked for a match +# against known sRGB profiles if the sRGB handling is enabled. This +# setting controls how much work is done during the check: +# +# 0: Just validate the profile MD5 signature if present, otherwise use +# the checks in option 1. +# +# 1: Additionally check the length, intent and adler32 checksum of the +# actual data. If enabled this will reject known profiles that have +# had the rendering intent in the header changed as well as other edits +# done without updating the checksum. See the discussion below. +# +# 2: Additionally checksum all the data using the ethernet CRC32 algorithm. +# This makes it more difficult to fake profiles and makes it less likely +# to get a false positive on profiles with no signature, but is probably +# just a waste of time since all currently approved ICC sRGB profiles have +# a secure MD5 signature. +# +# The rendering intent. An ICC profile stores an intended rendering intent, +# but does not include the value in the signature. The intent is documented +# as the intent that should be used when combining two profiles. The sRGB +# profile is intended, however, to be used with any of the four defined intents. +# For this reason the sRGB chunk includes an 'intent' to be used when displaying +# the image (intent is really a property of the image not the profile.) +# +# Unfortunately the iCCP chunk does not. It may therefore be that some +# applications modify the intent in profiles (including sRGB profiles) to work +# round this problem. Selecting an option other than option '0' will cause such +# modified profiles to be rejected. +# +# Security. The use of Adler32 and CRC32 checksums does not help significantly +# with any security issues. It is relatively easy to produce arbitrary profiles +# with the required checksums on current computer systems. Nevertheless +# security does not seem to be an issue because the only consequence of a false +# positive is a false assertion that the profile is an sRGB profile. This might +# be used to hide data from libpng using applications, but it doesn't seem +# possible to damage them. -option CHECK_cHRM requires cHRM +setting sRGB_PROFILE_CHECKS default 2 -# # Artificially align memory - the code typically aligns to 8 byte # boundaries if this is switched on, it's a small waste of space # but can help (in theory) on some architectures. Only affects # internal structures. Added at libpng 1.4.0 @@ -508,22 +614,46 @@ # it should not make much difference how big this is. setting ZBUF_SIZE default 8192 +# This is the size of the decompression buffer used when counting or checking +# the decompressed size of an LZ stream from a compressed ancilliary chunk; the +# decompressed data is never used so a different size may be optimal. This size +# was determined using contrib/libtests/timepng.c with compressed zTXt data +# around 11MByte in size. Slight speed improvements (up to about 14% in +# timepng) can be achieved by very large increases (to 32kbyte) on regular data, +# but highly compressible data shows only around 2% improvement. The size is +# chosen to minimize the effects of DoS attacks based on using very large +# amounts of highly compressible data. + +setting INFLATE_BUF_SIZE default 1024 + +# This is the maximum amount of IDAT data that the sequential reader will +# process at one time. The setting does not affect the size of IDAT chunks +# read, just the amount read at once. Neither does it affect the progressive +# reader, which processes just the amount of data the application gives it. +# The sequential reader is currently unable to process more than one IDAT at +# once - it has to read and process each one in turn. There is no point setting +# this to a value larger than the IDAT chunks typically encountered (it would +# just waste memory) but there may be some point in reducing it below the value +# of ZBUF_SIZE (the size of IDAT chunks written by libpng.) + +setting IDAT_READ_SIZE default PNG_ZBUF_SIZE + # Ancillary chunks chunk bKGD -chunk cHRM -chunk gAMA +chunk cHRM enables COLORSPACE +chunk gAMA enables GAMMA chunk hIST -chunk iCCP +chunk iCCP enables COLORSPACE GAMMA chunk iTXt chunk oFFs chunk pCAL -chunk sCAL chunk pHYs chunk sBIT +chunk sCAL chunk sPLT -chunk sRGB +chunk sRGB enables COLORSPACE GAMMA chunk tEXt requires TEXT chunk tIME chunk tRNS chunk zTXt @@ -533,11 +663,57 @@ # of the regular chunk reading too. option READ_OPT_PLTE requires READ_ANCILLARY_CHUNKS -option READ_UNKNOWN_CHUNKS requires READ -option READ_UNKNOWN_CHUNKS enables UNKNOWN_CHUNKS READ_USER_CHUNKS -option READ_USER_CHUNKS requires READ enables USER_CHUNKS +# Unknown chunk handling +# +# 'UNKNOWN_CHUNKS' is a global option to disable all unknown chunk handling on +# read or write; everything else below requires it (directly or indirectly). +option UNKNOWN_CHUNKS + +# There are three main options to control the ability to read and write unknown +# chunks. If either read option is turned on then unknown chunks will be read, +# otherwise they are skipped. If the write option is turned on unknown chunks +# set by png_set_unknown_chunks will be written otherwise it is an error to call +# that API on a write struct. +option WRITE_UNKNOWN_CHUNKS requires WRITE requires UNKNOWN_CHUNKS +option WRITE_UNKNOWN_CHUNKS enables STORE_UNKNOWN_CHUNKS + +# The first way to read user chunks is to have libpng save them for a later call +# to png_get_unknown_chunks, the application must call +# png_set_keep_unknown_chunks to cause this to actually happen (see png.h) +option SAVE_UNKNOWN_CHUNKS requires READ requires SET_UNKNOWN_CHUNKS +option SAVE_UNKNOWN_CHUNKS enables READ_UNKNOWN_CHUNKS STORE_UNKNOWN_CHUNKS + +# The second approach is to use an application provided callback to process the +# chunks, the callback can either handle the chunk entirely itself or request +# that libpng store the chunk for later retrieval via png_get_unknown_chunks. +# +# Note that there is no 'WRITE_USER_CHUNKS' so the USER_CHUNKS option is always +# the same as READ_USER_CHUNKS at present +option READ_USER_CHUNKS requires READ requires UNKNOWN_CHUNKS +option READ_USER_CHUNKS enables READ_UNKNOWN_CHUNKS USER_CHUNKS + +# Two further options are provided to allow detailed control of the handling. +# The first enables png_set_keep_unknown_chunks; this allows the default to be +# changed from discarding unknown chunks and allows per-chunk control. This is +# required to use the SAVE_UNKNOWN_CHUNKS option. If enabled this option also +# applies to write (see png.h), otherwise the write API simply writes all the +# chunks it is given. +# +# The second option extends the unknown handling to allow known chunks to be +# handled as though they were unknown. This option doesn't change any APIs, it +# merely turns on the code to check known as well as unknown chunks. +# +# This option no longer affects the write code. It can be safely disabled and +# will prevent applications stopping libpng reading known chunks. +option SET_UNKNOWN_CHUNKS requires UNKNOWN_CHUNKS +option HANDLE_AS_UNKNOWN requires SET_UNKNOWN_CHUNKS + +# The following options are derived from the above and should not be turned on +# explicitly. +option READ_UNKNOWN_CHUNKS requires UNKNOWN_CHUNKS disabled +option STORE_UNKNOWN_CHUNKS requires UNKNOWN_CHUNKS disabled option CONVERT_tIME requires WRITE_ANCILLARY_CHUNKS # The "tm" structure is not supported on WindowsCE @@ -546,15 +722,12 @@ @#endif option WRITE_FILTER requires WRITE -option WRITE_UNKNOWN_CHUNKS requires WRITE - -option HANDLE_AS_UNKNOWN - -option SAVE_INT_32 requires WRITE - -# png_save_int_32 is required by the ancillary chunks oFFs and pCAL +option SAVE_INT_32 disabled +# png_save_int_32 is required internally for writing the ancillary chunks oFFs +# and pCAL and for both reading and writing iCCP (for the generation/checking of +# the corresponding cHRM/gAMA chunks) if full ICC is supported. # added at libpng-1.5.4 option WRITE_OPTIMIZE_CMF requires WRITE @@ -587,4 +760,32 @@ option CHECK_FOR_INVALID_INDEX enables WRITE_CHECK_FOR_INVALID_INDEX option READ_CHECK_FOR_INVALID_INDEX requires READ CHECK_FOR_INVALID_INDEX option WRITE_CHECK_FOR_INVALID_INDEX requires WRITE CHECK_FOR_INVALID_INDEX +# Simplified API options (added at libpng-1.6.0) +# Read: +option SIMPLIFIED_READ requires SEQUENTIAL_READ READ_TRANSFORMS SETJMP +option SIMPLIFIED_READ requires BENIGN_ERRORS READ_GAMMA +option SIMPLIFIED_READ enables READ_EXPAND READ_16BIT READ_EXPAND_16 +option SIMPLIFIED_READ enables READ_SCALE_16_TO_8 READ_RGB_TO_GRAY +option SIMPLIFIED_READ enables READ_ALPHA_MODE READ_BACKGROUND READ_STRIP_ALPHA +option SIMPLIFIED_READ enables READ_FILLER READ_SWAP + +option SIMPLIFIED_READ_AFIRST requires SIMPLIFIED_READ disabled +option READ_SWAP_ALPHA enables SIMPLIFIED_READ_AFIRST + +option SIMPLIFIED_READ_BGR requires SIMPLIFIED_READ disabled +option READ_BGR enables SIMPLIFIED_READ_BGR + +# Write: +option SIMPLIFIED_WRITE requires WRITE STDIO SETJMP +option SIMPLIFIED_WRITE enables WRITE_SWAP WRITE_gAMA WRITE_sRGB WRITE_cHRM + +option SIMPLIFIED_WRITE_AFIRST requires SIMPLIFIED_WRITE disabled +option WRITE_SWAP_ALPHA enables SIMPLIFIED_WRITE_AFIRST + +option SIMPLIFIED_WRITE_BGR requires SIMPLIFIED_WRITE disabled +option WRITE_BGR enables SIMPLIFIED_WRITE_BGR + +# Formats: +option FORMAT_AFIRST if SIMPLIFIED_READ_AFIRST SIMPLIFIED_WRITE_AFIRST +option FORMAT_BGR if SIMPLIFIED_READ_BGR SIMPLIFIED_WRITE_BGR diff -ru4NwbB libpng-1.5.13/scripts/pnglibconf.h.prebuilt libpng-1.6.0beta32/scripts/pnglibconf.h.prebuilt --- libpng-1.5.13/scripts/pnglibconf.h.prebuilt 2012-09-27 06:21:21.788947234 -0500 +++ libpng-1.6.0beta32/scripts/pnglibconf.h.prebuilt 2012-11-25 12:40:12.646770271 -0600 @@ -25,34 +25,42 @@ #define PNG_CALLOC_SUPPORTED #define PNG_COST_SHIFT 3 #define PNG_DEFAULT_READ_MACROS 1 #define PNG_GAMMA_THRESHOLD_FIXED 5000 +#define PNG_IDAT_READ_SIZE PNG_ZBUF_SIZE +#define PNG_INFLATE_BUF_SIZE 1024 #define PNG_MAX_GAMMA_8 11 #define PNG_QUANTIZE_BLUE_BITS 5 #define PNG_QUANTIZE_GREEN_BITS 5 #define PNG_QUANTIZE_RED_BITS 5 #define PNG_sCAL_PRECISION 5 +#define PNG_sRGB_PROFILE_CHECKS 2 #define PNG_WEIGHT_SHIFT 8 #define PNG_ZBUF_SIZE 8192 /* end of settings */ /* options */ #define PNG_16BIT_SUPPORTED #define PNG_ALIGN_MEMORY_SUPPORTED #define PNG_BENIGN_ERRORS_SUPPORTED +#define PNG_BENIGN_READ_ERRORS_SUPPORTED +/*#undef PNG_BENIGN_WRITE_ERRORS_SUPPORTED*/ #define PNG_bKGD_SUPPORTED #define PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED -#define PNG_CHECK_cHRM_SUPPORTED #define PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED #define PNG_cHRM_SUPPORTED +#define PNG_COLORSPACE_SUPPORTED #define PNG_CONSOLE_IO_SUPPORTED #define PNG_CONVERT_tIME_SUPPORTED #define PNG_EASY_ACCESS_SUPPORTED /*#undef PNG_ERROR_NUMBERS_SUPPORTED*/ #define PNG_ERROR_TEXT_SUPPORTED #define PNG_FIXED_POINT_SUPPORTED #define PNG_FLOATING_ARITHMETIC_SUPPORTED #define PNG_FLOATING_POINT_SUPPORTED +#define PNG_FORMAT_AFIRST_SUPPORTED +#define PNG_FORMAT_BGR_SUPPORTED #define PNG_gAMA_SUPPORTED +#define PNG_GAMMA_SUPPORTED #define PNG_HANDLE_AS_UNKNOWN_SUPPORTED #define PNG_hIST_SUPPORTED #define PNG_iCCP_SUPPORTED #define PNG_INCH_CONVERSIONS_SUPPORTED @@ -115,19 +123,29 @@ #define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED #define PNG_READ_USER_CHUNKS_SUPPORTED #define PNG_READ_USER_TRANSFORM_SUPPORTED #define PNG_READ_zTXt_SUPPORTED +/*#undef PNG_SAFE_LIMITS_SUPPORTED*/ #define PNG_SAVE_INT_32_SUPPORTED +#define PNG_SAVE_UNKNOWN_CHUNKS_SUPPORTED #define PNG_sBIT_SUPPORTED #define PNG_sCAL_SUPPORTED #define PNG_SEQUENTIAL_READ_SUPPORTED #define PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED #define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED #define PNG_SETJMP_SUPPORTED +#define PNG_SET_UNKNOWN_CHUNKS_SUPPORTED #define PNG_SET_USER_LIMITS_SUPPORTED +#define PNG_SIMPLIFIED_READ_AFIRST_SUPPORTED +#define PNG_SIMPLIFIED_READ_BGR_SUPPORTED +#define PNG_SIMPLIFIED_READ_SUPPORTED +#define PNG_SIMPLIFIED_WRITE_AFIRST_SUPPORTED +#define PNG_SIMPLIFIED_WRITE_BGR_SUPPORTED +#define PNG_SIMPLIFIED_WRITE_SUPPORTED #define PNG_sPLT_SUPPORTED #define PNG_sRGB_SUPPORTED #define PNG_STDIO_SUPPORTED +#define PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED #define PNG_tEXt_SUPPORTED #define PNG_TEXT_SUPPORTED #define PNG_TIME_RFC1123_SUPPORTED #define PNG_tIME_SUPPORTED diff -ru4NwbB libpng-1.5.13/scripts/pnglibconf.mak libpng-1.6.0beta32/scripts/pnglibconf.mak --- libpng-1.5.13/scripts/pnglibconf.mak 2011-11-08 19:12:49.536424000 -0600 +++ libpng-1.6.0beta32/scripts/pnglibconf.mak 2012-02-23 18:09:46.000000000 -0600 @@ -17,9 +17,10 @@ COPY = cp DELETE = rm -f ECHO = echo -DFA_XTRA = # Appended to scripts/options.awk +DFA_XTRA = # Put your configuration file here, see scripts/pnglibconf.dfa. Eg: +# DFA_XTRA = pngusr.dfa # CPPFLAGS should contain the options to control the result, # but DEFS and CFLAGS are also supported here, override # as appropriate @@ -40,15 +41,15 @@ $(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' dfn2.out >dfn3.out $(COPY) dfn3.out $@ $(DELETE) dfn.c dfn1.out dfn2.out dfn3.out -pnglibconf.dfn: $(srcdir)/scripts/pnglibconf.dfa $(srcdir)/scripts/options.awk $(srcdir)/pngconf.h +pnglibconf.dfn: $(srcdir)/scripts/pnglibconf.dfa $(srcdir)/scripts/options.awk $(srcdir)/pngconf.h $(srcdir)/pngusr.dfa $(DELETE) $@ dfn1.out dfn2.out $(ECHO) "Calling $(AWK) from scripts/pnglibconf.mak" >&2 $(ECHO) "If 'awk' crashes try a better awk (e.g. AWK='nawk')" >&2 $(AWK) -f $(srcdir)/scripts/options.awk out=dfn1.out version=search\ $(srcdir)/pngconf.h $(srcdir)/scripts/pnglibconf.dfa\ - $(DFA_XTRA) 1>&2 + $(srcdir)/pngusr.dfa $(DFA_XTRA) 1>&2 $(AWK) -f $(srcdir)/scripts/options.awk out=dfn2.out dfn1.out 1>&2 $(COPY) dfn2.out $@ $(DELETE) dfn1.out dfn2.out diff -ru4NwbB libpng-1.5.13/scripts/prefix.dfn libpng-1.6.0beta32/scripts/prefix.dfn --- libpng-1.5.13/scripts/prefix.dfn 1969-12-31 18:00:00.000000000 -0600 +++ libpng-1.6.0beta32/scripts/prefix.dfn 2012-01-31 07:18:34.000000000 -0600 @@ -0,0 +1,20 @@ + +/* prefix.dfn - generate an unprefixed symbol list + * + * Last changed in libpng version 1.6.0 [January 30, 2012] + * Copyright (c) 2012 Glenn Randers-Pehrson + * + * This code is released under the libpng license. + * For conditions of distribution and use, see the disclaimer + * and license in png.h + */ + +#define PNG_EXPORTA(ordinal, type, name, args, attributes)\ + PNG_DEFN_MAGIC-name-PNG_DEFN_END + +/* The configuration information *before* the additional of symbol renames, + * the list is the C name list; no symbol prefix. + */ +#include "pnglibconf.out" + +#include "../png.h" diff -ru4NwbB libpng-1.5.13/scripts/symbols.def libpng-1.6.0beta32/scripts/symbols.def --- libpng-1.5.13/scripts/symbols.def 2012-09-27 06:21:21.800430432 -0500 +++ libpng-1.6.0beta32/scripts/symbols.def 2012-11-25 12:40:12.658276897 -0600 @@ -204,9 +204,8 @@ png_get_x_offset_inches @196 png_get_y_offset_inches @197 png_get_pHYs_dpi @198 png_get_io_state @199 - png_get_io_chunk_name @200 png_get_uint_32 @201 png_get_uint_16 @202 png_get_int_32 @203 png_get_uint_31 @204 @@ -238,5 +237,13 @@ png_get_cHRM_XYZ @230 png_get_cHRM_XYZ_fixed @231 png_set_cHRM_XYZ @232 png_set_cHRM_XYZ_fixed @233 - png_set_check_for_invalid_index @234 + png_image_begin_read_from_file @234 + png_image_begin_read_from_stdio @235 + png_image_begin_read_from_memory @236 + png_image_finish_read @237 + png_image_free @238 + png_image_write_to_file @239 + png_image_write_to_stdio @240 + png_convert_to_rfc1123_buffer @241 + png_set_check_for_invalid_index @242