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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  decompres-
       sion  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 (provid-
       ing 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 (pmqs@cpan.org), is
       available at CPAN (Comprehensive Perl Archive Network)  sites,  includ-
       ing:

	      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@west-
       end.com), 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 (info@winimage.com), is available at:

	      http://www.winimage.com/zLibDll/unzip.html and also in the  con-
	      trib/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 (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  Windows  DLL	 version)  to  Gilles  Vollant
       (info@winimage.com).

AUTHORS
       Version 1.2.3 Copyright (C) 1995-2005 Jean-loup Gailly (jloup@gzip.org)
       and Mark Adler (madler@alumni.caltech.edu).

       This software is provided "as-is," without any express or implied  war-
       ranty.	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
       (rodgers@nlm.nih.gov).

				 18 July 2005			       ZLIB(3)
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