zlib

zlib or libz is a well known compression library. It has several lisp implementations and FFI's:

The newest (C)FFI based one supporting its streaming interface is here in the cl-quasi-quote repo.

ZLIB is a purely Common Lisp implementation of the zlib Compression Library. It was originally written by Harald Musum and is now maintained by Matthieu Villeneuve. It is licensed under the LLGPL.
Project homepage: http://common-lisp.net/project/zlib/

cl-zlib relies on the presence of the zlib shared library (libz.so or zlib.dll, uses UFFI and ASDF.

salza and its successor salza2 - are pure lisp implementations under a BSD-style license.

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