The PNG spec allows for only one method of compression inside of IDAT chunks: inflate/deflate (Zlib). However, Zlib lets us do some crazy things as long as we make it happy by giving it an Adler hash and spawning some other needed data thus emulating a part of the Zlib spec :-) I just hope this works as I think it does :P
git-svn-id: file:///svn/phpbb/trunk@5518 89ea8834-ac86-4346-8a33-228a782c2dd0