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ZLIB(3) 										  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.
       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 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 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 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 (pmqs@cpan.org), 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 (amk@magnet.com), 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 (a.kupries@westend.com), is  availl-
       able 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 (info@winimage.com), is available at:

	      http://www.winimage.com/zLibDll/unzip.html and also in the  contrib/minizip  direc-
	      tory 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 (markn@ieee.org) 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 zlib@gzip.org, or (for the Win-
       dows DLL version) to Gilles Vollant (info@winimage.com).

AUTHORS
       Version 1.2.3.4 Copyright (C) 1995-2006 Jean-loup Gailly (jloup@gzip.org) and  Mark  Adler
       (madler@alumni.caltech.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@nlm.nih.gov).

					 21 December 2009				  ZLIB(3)
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