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.TH ZLIB 3 "9 July 1998"
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2011-09-10 02:17:33 -04:00
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.SH NAME
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zlib \- compression/decompression library
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.SH SYNOPSIS
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[see
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.I zlib.h
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for full description]
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.SH DESCRIPTION
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The
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.I zlib
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library is a general purpose data compression library.
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The code is thread safe.
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It provides in-memory compression and decompression functions,
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including integrity checks of the uncompressed data.
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This version of the library supports only one compression method (deflation)
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but other algorithms will be added later and will have the same stream interface.
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.LP
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Compression can be done in a single step if the buffers are large enough
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(for example if an input file is mmap'ed),
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or can be done by repeated calls of the compression function.
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In the latter case,
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the application must provide more input and/or consume the output
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(providing more output space) before each call.
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.LP
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The library also supports reading and writing files in
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.I gzip
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(.gz) format
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with an interface similar to that of stdio.
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.LP
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The library does not install any signal handler. The decoder checks
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the consistency of the compressed data, so the library should never
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crash even in case of corrupted input.
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.LP
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All functions of the compression library are documented in the file
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.IR zlib.h.
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The distribution source includes examples of use of the library
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the files
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.I example.c
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and
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.IR minigzip.c .
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.LP
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A Java implementation of
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.IR zlib
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is available in the Java Development Kit 1.1
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.IP
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http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
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.LP
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A Perl interface to
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.IR zlib ,
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written by Paul Marquess (pmarquess@bfsec.bt.co.uk)
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is available at CPAN (Comprehensive Perl Archive Network) sites,
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such as:
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.IP
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ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
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.LP
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A Python interface to
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.IR zlib
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written by A.M. Kuchling <amk@magnet.com>
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is available from the Python Software Association sites, such as:
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.IP
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ftp://ftp.python.org/pub/python/contrib/Encoding/zlib*.tar.gz
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.SH "SEE ALSO"
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Questions about zlib should be sent to:
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.IP
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zlib@quest.jpl.nasa.gov
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or, if this fails, to the author addresses given below.
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The zlib home page is:
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.IP
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http://www.cdrom.com/pub/infozip/zlib/
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.LP
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The data format used by the zlib library is described by RFC
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(Request for Comments) 1950 to 1952 in the files:
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.IP
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ftp://ds.internic.net/rfc/rfc1950.txt (zlib format)
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.br
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rfc1951.txt (deflate format)
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.br
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rfc1952.txt (gzip format)
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.LP
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These documents are also available in other formats from:
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.IP
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ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
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.SH AUTHORS
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Version 1.1.3
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Copyright (C) 1995-1998 Jean-loup Gailly (jloup@gzip.org)
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and Mark Adler (madler@alumni.caltech.edu).
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.LP
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This software is provided "as-is,"
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without any express or implied warranty.
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In no event will the authors be held liable for any damages
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arising from the use of this software.
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See the distribution directory with respect to requirements
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governing redistribution.
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The deflate format used by
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.I zlib
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was defined by Phil Katz.
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The deflate and
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.I zlib
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specifications were written by L. Peter Deutsch.
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Thanks to all the people who reported problems and suggested various
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improvements in
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.IR zlib ;
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who are too numerous to cite here.
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.LP
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UNIX manual page by R. P. C. Rodgers,
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U.S. National Library of Medicine (rodgers@nlm.nih.gov).
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.\" end of man page
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