Add support for Microsoft Compress archives

[ci-macpaw]

Originally reported on Google Code with ID 301

d235j.1:

I'm not sure if Microsoft Compress archives work, but these sure don't:

http://cd.textfiles.com/gw2k42/WFW311/

The compressed files have extensions ending with _ . Expand.exe (also in that directory)
is normally used to extract them.

mscompress from ftp://ftp.penguin.cz/pub/users/mhi/mscompress is supposed to work but
doesn't appear to.

[ci-macpaw]

jeremyagost:

Update:
I compiled libmspack and the included test program "extract" was able to decompress
the files.

[ci-macpaw]

jeremyagost:

The first four bytes of the file header (KWAJ) lead me to this: http://www.cabextract.org.uk/libmspack/doc/szdd_kwaj_format.html

From the header it looks like compression method 3, a combination of LZ and huffman.

This library looks like it can handle the samples:
http://www.cabextract.org.uk/libmspack/

[ci-macpaw]

paracelsus:

Yeah, these seem to be entirely unsupported. This should definitely be fixed.