Compression can be done in a single step if the buffers are large enough (for example if an input file is mmap'ed), or can be done by repeated calls of the compression function. In the latter case, the application must provide more input and/or consume the output (providing more output space) before each call.
The library also supports reading and writing files in gzip(1) (.gz) format with an interface similar to that of stdio.
The library does not install any signal handler. The decoder checks the consistency of the compressed data, so the library should never crash even in case of corrupted input.
All functions of the compression library are documented in the file zlib.h. The distribution source includes examples of use of the library in the files example.c and minigzip.c.
Changes to this version are documented in the file ChangeLog that accompanies the source, and are concerned primarily with bug fixes and portability enhancements.
A Java implementation of zlib is available in the Java Development Kit 1.1:
A Perl interface to zlib, written by Paul Marquess ([email protected]), is available at CPAN (Comprehensive Perl Archive Network) sites, including:
A Python interface to zlib, written by A.M. Kuchling ([email protected]), is available in Python 1.5 and later versions:
A zlib binding for tcl(1), written by Andreas Kupries ([email protected]), is availlable at:
An experimental package to read and write files in .zip format, written on top of zlib by Gilles Vollant ([email protected]), is available at:
The data format used by the zlib library is described by RFC (Request for Comments) 1950 to 1952 in the files:
These documents are also available in other formats from:
Mark Nelson ([email protected]) wrote an article about zlib for the Jan. 1997 issue of Dr. Dobb's Journal; a copy of the article is available at:
before asking for help. Send questions and/or comments to [email protected], or (for the Windows DLL version) to Gilles Vollant ([email protected]).
This software is provided "as-is," without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. See the distribution directory with respect to requirements governing redistribution. The deflate format used by zlib was defined by Phil Katz. The deflate and zlib specifications were written by L. Peter Deutsch. Thanks to all the people who reported problems and suggested various improvements in zlib; who are too numerous to cite here.
UNIX manual page by R. P. C. Rodgers, U.S. National Library of Medicine ([email protected]).