Hi
This is the hack made by ebs:
https://www.mobileread.com/forums/sho...8&postcount=66
which includes the source code.
The file "framework-impl.jar.bdiff" (I guess) patches the "file framework_impl.jar" (but only for 2.2 version; ebs was smart enough to do a check before patching).
The main problem is that the .bdiff file is a 12k binary file. I think only ebs would be able to make easily a new patch. Someone else would have to do the patch from scratch.