This contains a local copy of parts of libmspack. Parts (lzxd.c and various header files) were originally lifted from libmspack and modified to support the LZX DELTA format. The "file format" support in oab-decompress.c was developed as part of Evolution-EWS, and a mostly rewritten version was later submitted for inclusion in libmspack upstream. If you have a sufficiently recent version of libmspack, none of the code in this directory will be used. Instead ews-oab-decompressor.c in the parent directory will invoke the decompressor in libmspack.