I just finished making a script dumper/inserter for Tales of Destiny 2 and it's clearly evident that a custom patch format will be necessary for the game's complete translation (PPF should still suffice for the menu patch), since the game's virtual file system file is going to wind up slightly larger than the original.

I'm currently brainstorming ideas on how it'll work, but I know I'm going to need some specific info on the UDF (DVD) file system. The official spec file is 168 pages, and uhh.. that's kind of annoyingly huge and hard to follow.

All I think I really need to know about is the file/directory info, and checksums. After that it shouldn't be too difficult to generate a new DVD image with the same files but with modified sizes inside... I hope.

Anyone with enough UDF knowledge here willing to lend a hand?

Don't think so, seeing as how my ideas to keep the patch as small as possible involves including some of my hacking utilities into the patcher.