I just modified zipdiff, a Java library to calculate differences between zip files. I use this library to generate incremental updates of ZenMagick and also to build the file change history.

This has been broken for a while and even though I could not get it to working again I figured out that it (or, ZipInputStream) crashes when trying to handle an embedded zip file.

I added an option to disable this feature. If anyone is interested I’d be more than happy to provide the modified source files. Seeing that the sourceforge code didn’t change for about 3 years I think there isn’t a lot of development going to happen anytime soon

So, the good news is that the next ZenMagick release will include the file change file again!