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ZLIB


Section: C Library Functions (3)
Updated: 18 July 2005
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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.
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 will be added later
and will have the same stream interface.

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:



http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html

A Perl interface to
zlib,

written by Paul Marquess ([email protected]),
is available at CPAN (Comprehensive Perl Archive Network) sites,
including:



http://www.cpan.org/modules/by-module/Compress/

A Python interface to
zlib,

written by A.M. Kuchling ([email protected]),
is available in Python 1.5 and later versions:



http://www.python.org/doc/lib/module-zlib.html

A
zlib

binding for
tcl(1),

written by Andreas Kupries ([email protected]),
is availlable at:



http://www.westend.com/~kupries/doc/trf/man/man.html

An experimental package to read and write files in .zip format,
written on top of
zlib

by Gilles Vollant ([email protected]),
is available at:



http://www.winimage.com/zLibDll/unzip.html
and also in the
contrib/minizip

directory of the main
zlib

web site.


 

SEE ALSO

The
zlib

web site can be found at either of these locations:



http://www.zlib.org

http://www.gzip.org/zlib/


The data format used by the zlib library is described by RFC
(Request for Comments) 1950 to 1952 in the files:



http://www.ietf.org/rfc/rfc1950.txt (concerning zlib format)

http://www.ietf.org/rfc/rfc1951.txt (concerning deflate format)

http://www.ietf.org/rfc/rfc1952.txt (concerning gzip format)


These documents are also available in other formats from:



ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html

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:



http://dogma.net/markn/articles/zlibtool/zlibtool.htm

 

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://www.gzip.org/zlib/zlib_faq.html

before asking for help.
Send questions and/or comments to [email protected],
or (for the Windows DLL version) to Gilles Vollant ([email protected]).
 

AUTHORS

Version 1.2.3
Copyright (C) 1995-2005 Jean-loup Gailly ([email protected])
and Mark Adler ([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]).



 

Index



NAME

SYNOPSIS

DESCRIPTION

SEE ALSO

REPORTING PROBLEMS

AUTHORS



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