> > * support for 7zip, rar (as long as there aren't any freely available
> > decompression AND compression routines for these packers, they won't be
> > supported).
> >
> > The LZMA SDK has changed it's licence from GPL to LGPL/CPL, so it can be used
> > now, I guess.
> > I don't need it, but just for information.
> >
>
> 7zip's sourcecode (esp for compressing) is a mess of gui + core routines and not
> well documentated. All attemps of seperating it and build a compression dll
> failed afaik.

Who is speaking of the 7-Zip source code? I meant the LZMA SDK, which has a plain C and well documented source, free of any GUI or platform/compiler-dependend code.

http://www.7-zip.org/sdk.html

LZMA SDK includes:
- C++ source code of LZMA Encoder and Decoder
- C++ source code for file->file LZMA compressing and decompressing
- ANSI-C compatible source code for LZMA decompressing with example
- Compiled file->file LZMA compressing/decompressing program for Windows system

ANSI-C LZMA decompression code was ported from original C++ sources to C. Also it was simplified and optimized for code size. But it is fully compatible with LZMA from 7-Zip.