This is a C implementation of Apple's LZBITMAP compression algorithm, reverse-engineered by myself via black box testing. For now it's much slower than the original, but the ratios obtained are similar.
The build is simple: as long as you have gcc and make installed, you can just run make. The API is documented inside the header file libzbitmap.h.
Please report any bugs you find to the author at <ernesto@corellium.com>, or file a github issue at https://github.com/eafer/libzbitmap/issues.