Deflate

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The Deflate library is a native Common Lisp implementation of Deflate (RFC 1951) decompression, with optional support for ZLIB-style (RFC 1950) and gzip-style (RFC 1952) wrappers of deflate streams. It currently does not handle compression, although this is a natural extension.

The implementation should be portable across all ANSI compliant CL implementations, but has been optimized mostly for SBCL and CMU CL (and other implementations that can generate fast code for word-sized integer calculations based on standard type declarations), and somewhat (mostly the otherwise very expensive CRC-32 calculations) for Lispworks. The performance is still a bit off from zlib/gzip (by a factor of around 3-3.5 on my systems), and while much of the performance loss is likely to be in the stream-based I/O, a less naive implementation of the huffman decoding step is also likely to benefit performance a bit.

The implementation is licensed under an X-style license (see below or the file COPYING in the distribution).

The current release can be downloaded from here:

Deflate-1.0.0.zip

or you can get the release, sources and git repository access from the project's page at GitHub:

License

;;;; Deflate --- RFC 1951 Deflate Decompression
;;;;
;;;; Copyright (C) 2000-2009 PMSF IT Consulting Pierre R. Mai.
;;;;
;;;; Permission is hereby granted, free of charge, to any person obtaining
;;;; a copy of this software and associated documentation files (the
;;;; "Software"), to deal in the Software without restriction, including
;;;; without limitation the rights to use, copy, modify, merge, publish,
;;;; distribute, sublicense, and/or sell copies of the Software, and to
;;;; permit persons to whom the Software is furnished to do so, subject to
;;;; the following conditions:
;;;;
;;;; The above copyright notice and this permission notice shall be
;;;; included in all copies or substantial portions of the Software.
;;;;
;;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
;;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
;;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
;;;; IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
;;;; OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
;;;; ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
;;;; OTHER DEALINGS IN THE SOFTWARE.
;;;;
;;;; Except as contained in this notice, the name of the author shall
;;;; not be used in advertising or otherwise to promote the sale, use or
;;;; other dealings in this Software without prior written authorization
;;;; from the author.