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Directory Patcher is a tool that makes a patch file for a whole directory.
Imagine you have repacked a game that has been updated by the developer and now you need to repack the whole game again for the update.
For cutting off your time you can make a patch using this program. You will need the old game files and the newer ones. This program will generate a patch for you and can easily apply it with the command line tool provided with this.

Usage for dpzapply.exe:
dpzapply.exe patchfile dir

The xdelta mode is faster than normal mode and takes less memory. But it requires xdelta3.exe to be present.
The normal mode uses bdiff by Peter Johnson. is slow and memory sucker. But it doesn't require any other files.

Bugs:
The program doesn't handle errors at this moment. If you do something wrong, the program may mess up stuff. Made this in one day so do some tests to know how it's actually doing stuff.

Source:
Will be uploaded soon.