CL-LZMA

This is a CFFI wrapper around a LZMA foreign library, compiled straight out of the official LZMA SDK C binary.

There is no portable Lisp LZMA (de)compressor because:

• the algorithm is complicated
• the LZMA SDK is very obfuscated code
• there is hardly any documentation for LZMA algorithm
• there is no known workforce that can rewrite this in Lisp.

TODO

• write a proper README, since the code seems to be working on my machine

Compiling

Right now, Windows, Linux and macOS x32/x64 binaries are provided. (32bit macOS binaries were not tested yet - if they work for you, please let me know.)

To compile your own:

1. Install the official LZMA SDK from Igor Pavlov.
2. Modify /C/Util/Lzma/makefile.gcc, add -fPIC to CFLAGS.
3. Remove makefile and move makefile.gcc to makefile.
4. Issue make, which will build all object files.
5. Build the shared library file. On Linux, this is $ gcc -shared -O2 -Wall -D_7ZIP_ST -fPIC -o lzma.so *.o - on other platforms, I bet you can figure it out.
6. Put the file anywhere you want and load it with CFFI.

Credits and inspirations

This is based on https://gist.github.com/phoe/8cfdcb4f34e0584c703f1751072a7813 - a CFFI wrapper that I quickly hacked up.

This is based on https://gist.github.com/Treeki/f431a2ff44aff984590a97a5c09f6f28 which is a C interface to the LZMA SDK.