I got hard times to understand what the problem is.
What i seem to understand:
Someone has a MAC.
He has also a hard-drive, formatted with ext4, and data on that
He wants the data on the MAC
Most easy:
mount ext4-partition with any Linux, upload to the web (say dropbox or google-docs or such) and download from the MAC.
On the LAN (assuming privacy problems are involved or the amount of data is too huge) one could attach any device to the router, run a LinuxLive CD, install apache, mount the ext4 and symlink the stuff to /var/www/share (after that is created with mkdir). Access that with safari-web-browser with the address: 192.168.144/share (whatever ifconfig tells bout the IP of the LinuxLiveCD running apache and mounting the ext4)
Should be that easy.
sshfs/sftp/filezilla/rsync or similar tools should be available for a mac
10daystestversion:
http://www.paragon-software.com/home/ex ... nload.html(though from FreeBSD i recall access to ext-* partitions to be a pain in the butt and ext4 being completely impossible).
woof or such is in my head (i did never do it).