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ZLIB(3) Library Functions Manual ZLIB(3)
NAME
zlib - compression/decompression library
SYNOPSIS
[see zlib.h for full description]
DESCRIPTION
The zlib library is a general purpose data compression library. The code is thread safe,
assuming that the standard library functions used are thread safe, such as memory alloca-
tion routines. It provides in-memory compression and decompression functions, including
integrity checks of the uncompressed data. This version of the library supports only one
compression method (deflation) but other algorithms may be added later with the same
stream interface.
Compression can be done in a single step if the buffers are large enough or can be done by
repeated calls of the compression function. In the latter case, the application must pro-
vide 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 inter-
face 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 the case of corrupted
input.
All functions of the compression library are documented in the file zlib.h. The distribu-
tion source includes examples of use of the library in the files test/example.c and
test/minigzip.c, as well as other examples in the examples/ directory.
Changes to this version are documented in the file ChangeLog that accompanies the source.
zlib is available in Java using the java.util.zip package:
http://java.sun.com/developer/technicalArticles/Programming/compression/
A Perl interface to zlib, written by Paul Marquess (pmqs AT cpan.org), is available at CPAN
(Comprehensive Perl Archive Network) sites, including:
http://search.cpan.org/~pmqs/IO-Compress-Zlib/
A Python interface to zlib, written by A.M. Kuchling (amk AT magnet.com), is available in
Python 1.5 and later versions:
http://docs.python.org/library/zlib.html
zlib is built into tcl:
http://wiki.tcl.tk/4610
An experimental package to read and write files in .zip format, written on top of zlib by
Gilles Vollant (info AT winimage.com), is available at:
http://www.winimage.com/zLibDll/minizip.html and also in the contrib/minizip direc-
tory of the main zlib source distribution.
SEE ALSO
The zlib web site can be found at:
http://zlib.net/
The data format used by the zlib library is described by RFC (Request for Comments) 1950
to 1952 in the files:
http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format)
http://tools.ietf.org/html/rfc1951 (for the deflate compressed data format)
http://tools.ietf.org/html/rfc1952 (for the gzip header and trailer format)
Mark Nelson wrote an article about zlib for the Jan. 1997 issue of Dr. Dobb's Journal; a
copy of the article is available at:
http://marknelson.us/1997/01/01/zlib-engine/
REPORTING PROBLEMS
Before reporting a problem, please check the zlib web site to verify that you have the
latest version of zlib; otherwise, obtain the latest version and see if the problem still
exists. Please read the zlib FAQ at:
http://zlib.net/zlib_faq.html
before asking for help. Send questions and/or comments to zlib AT gzip.org, or (for the Win-
dows DLL version) to Gilles Vollant (info AT winimage.com).
AUTHORS
Version 1.2.7 Copyright (C) 1995-2012 Jean-loup Gailly (jloup AT gzip.org) and Mark Adler
(madler AT alumni.edu).
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 sug-
gested 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
(rodgers AT nlm.gov).
2 May 2012 ZLIB(3)
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