A Common Lisp FFI for zlib (which is a compression library for deflate and gzip written in C).
It uses CFFI/C2FFI to automatically generate the CFFI definitions, so it's a complete interface based on the C header files.
zlib's gzip format can be used for compressing HTTP responses to browsers.
Written by attila@lendvai.name.
The primary communication channel is the facilities on the project's GitHub page.
The raw FFI part is almost complete (except some va_list stuff).
No fancy lispy overlay API has been added; it seems to be convenient enough without it.
It's used in hu.dwim.web-server to compress HTTP responses.
It has a test that compresses and decompresses random data in random zlib configurations, and it doesn't yield any errors for me when run for minutes (besides some zlib peculiarities/bugs that are avoided by the test code).