zlib.3
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- .TH ZLIB 3 "18 July 2005"
- .SH NAME
- zlib - compression/decompression library
- .SH SYNOPSIS
- [see
- .I zlib.h
- for full description]
- .SH DESCRIPTION
- The
- .I 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.
- .LP
- 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.
- .LP
- The library also supports reading and writing files in
- .IR gzip (1)
- (.gz) format
- with an interface similar to that of stdio.
- .LP
- 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.
- .LP
- All functions of the compression library are documented in the file
- .IR zlib.h .
- The distribution source includes examples of use of the library
- in the files
- .I example.c
- and
- .IR minigzip.c .
- .LP
- Changes to this version are documented in the file
- .I ChangeLog
- that accompanies the source,
- and are concerned primarily with bug fixes and portability enhancements.
- .LP
- A Java implementation of
- .I zlib
- is available in the Java Development Kit 1.1:
- .IP
- http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
- .LP
- A Perl interface to
- .IR zlib ,
- written by Paul Marquess (pmqs@cpan.org),
- is available at CPAN (Comprehensive Perl Archive Network) sites,
- including:
- .IP
- http://www.cpan.org/modules/by-module/Compress/
- .LP
- A Python interface to
- .IR zlib ,
- written by A.M. Kuchling (amk@magnet.com),
- is available in Python 1.5 and later versions:
- .IP
- http://www.python.org/doc/lib/module-zlib.html
- .LP
- A
- .I zlib
- binding for
- .IR tcl (1),
- written by Andreas Kupries (a.kupries@westend.com),
- is availlable at:
- .IP
- http://www.westend.com/~kupries/doc/trf/man/man.html
- .LP
- An experimental package to read and write files in .zip format,
- written on top of
- .I zlib
- by Gilles Vollant (info@winimage.com),
- is available at:
- .IP
- http://www.winimage.com/zLibDll/unzip.html
- and also in the
- .I contrib/minizip
- directory of the main
- .I zlib
- web site.
- .SH "SEE ALSO"
- The
- .I zlib
- web site can be found at either of these locations:
- .IP
- http://www.zlib.org
- .br
- http://www.gzip.org/zlib/
- .LP
- The data format used by the zlib library is described by RFC
- (Request for Comments) 1950 to 1952 in the files:
- .IP
- http://www.ietf.org/rfc/rfc1950.txt (concerning zlib format)
- .br
- http://www.ietf.org/rfc/rfc1951.txt (concerning deflate format)
- .br
- http://www.ietf.org/rfc/rfc1952.txt (concerning gzip format)
- .LP
- These documents are also available in other formats from:
- .IP
- ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
- .LP
- Mark Nelson (markn@ieee.org) wrote an article about
- .I zlib
- for the Jan. 1997 issue of Dr. Dobb's Journal;
- a copy of the article is available at:
- .IP
- http://dogma.net/markn/articles/zlibtool/zlibtool.htm
- .SH "REPORTING PROBLEMS"
- Before reporting a problem,
- please check the
- .I zlib
- web site to verify that you have the latest version of
- .IR zlib ;
- otherwise,
- obtain the latest version and see if the problem still exists.
- Please read the
- .I zlib
- FAQ at:
- .IP
- http://www.gzip.org/zlib/zlib_faq.html
- .LP
- 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).
- .SH AUTHORS
- Version 1.2.3
- Copyright (C) 1995-2005 Jean-loup Gailly (jloup@gzip.org)
- and Mark Adler (madler@alumni.caltech.edu).
- .LP
- 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
- .I zlib
- was defined by Phil Katz.
- The deflate and
- .I zlib
- specifications were written by L. Peter Deutsch.
- Thanks to all the people who reported problems and suggested various
- improvements in
- .IR zlib ;
- who are too numerous to cite here.
- .LP
- UNIX manual page by R. P. C. Rodgers,
- U.S. National Library of Medicine (rodgers@nlm.nih.gov).
- ." end of man page