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1.TH ZLIB 3 "18 July 2005" 1.TH ZLIB 3 "18 July 2005"
2.SH NAME 2.SH NAME
3zlib \- compression/decompression library 3zlib \- compression/decompression library
4.SH SYNOPSIS 4.SH SYNOPSIS
5[see 5[see
6.I zlib.h 6.I zlib.h
7for full description] 7for full description]
8.SH DESCRIPTION 8.SH DESCRIPTION
9The 9The
10.I zlib 10.I zlib
11library is a general purpose data compression library. 11library is a general purpose data compression library.
12The code is thread safe. 12The code is thread safe.
13It provides in-memory compression and decompression functions, 13It provides in-memory compression and decompression functions,
14including integrity checks of the uncompressed data. 14including integrity checks of the uncompressed data.
15This version of the library supports only one compression method (deflation) 15This version of the library supports only one compression method (deflation)
16but other algorithms will be added later 16but other algorithms will be added later
17and will have the same stream interface. 17and will have the same stream interface.
18.LP 18.LP
19Compression can be done in a single step if the buffers are large enough 19Compression can be done in a single step if the buffers are large enough
20(for example if an input file is mmap'ed), 20(for example if an input file is mmap'ed),
21or can be done by repeated calls of the compression function. 21or can be done by repeated calls of the compression function.
22In the latter case, 22In the latter case,
23the application must provide more input and/or consume the output 23the application must provide more input and/or consume the output
24(providing more output space) before each call. 24(providing more output space) before each call.
25.LP 25.LP
26The library also supports reading and writing files in 26The library also supports reading and writing files in
27.IR gzip (1) 27.IR gzip (1)
28(.gz) format 28(.gz) format
29with an interface similar to that of stdio. 29with an interface similar to that of stdio.
30.LP 30.LP
31The library does not install any signal handler. 31The library does not install any signal handler.
32The decoder checks the consistency of the compressed data, 32The decoder checks the consistency of the compressed data,
33so the library should never crash even in case of corrupted input. 33so the library should never crash even in case of corrupted input.
34.LP 34.LP
35All functions of the compression library are documented in the file 35All functions of the compression library are documented in the file
36.IR zlib.h . 36.IR zlib.h .
37The distribution source includes examples of use of the library 37The distribution source includes examples of use of the library
38in the files 38in the files
39.I example.c 39.I example.c
40and 40and
41.IR minigzip.c . 41.IR minigzip.c .
42.LP 42.LP
43Changes to this version are documented in the file 43Changes to this version are documented in the file
44.I ChangeLog 44.I ChangeLog
45that accompanies the source, 45that accompanies the source,
46and are concerned primarily with bug fixes and portability enhancements. 46and are concerned primarily with bug fixes and portability enhancements.
47.LP 47.LP
48A Java implementation of 48A Java implementation of
49.I zlib 49.I zlib
50is available in the Java Development Kit 1.1: 50is available in the Java Development Kit 1.1:
51.IP 51.IP
52http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html 52http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
53.LP 53.LP
54A Perl interface to 54A Perl interface to
55.IR zlib , 55.IR zlib ,
56written by Paul Marquess (pmqs@cpan.org), 56written by Paul Marquess (pmqs@cpan.org),
57is available at CPAN (Comprehensive Perl Archive Network) sites, 57is available at CPAN (Comprehensive Perl Archive Network) sites,
58including: 58including:
59.IP 59.IP
60http://www.cpan.org/modules/by-module/Compress/ 60http://www.cpan.org/modules/by-module/Compress/
61.LP 61.LP
62A Python interface to 62A Python interface to
63.IR zlib , 63.IR zlib ,
64written by A.M. Kuchling (amk@magnet.com), 64written by A.M. Kuchling (amk@magnet.com),
65is available in Python 1.5 and later versions: 65is available in Python 1.5 and later versions:
66.IP 66.IP
67http://www.python.org/doc/lib/module-zlib.html 67http://www.python.org/doc/lib/module-zlib.html
68.LP 68.LP
69A 69A
70.I zlib 70.I zlib
71binding for 71binding for
72.IR tcl (1), 72.IR tcl (1),
73written by Andreas Kupries (a.kupries@westend.com), 73written by Andreas Kupries (a.kupries@westend.com),
74is availlable at: 74is availlable at:
75.IP 75.IP
76http://www.westend.com/~kupries/doc/trf/man/man.html 76http://www.westend.com/~kupries/doc/trf/man/man.html
77.LP 77.LP
78An experimental package to read and write files in .zip format, 78An experimental package to read and write files in .zip format,
79written on top of 79written on top of
80.I zlib 80.I zlib
81by Gilles Vollant (info@winimage.com), 81by Gilles Vollant (info@winimage.com),
82is available at: 82is available at:
83.IP 83.IP
84http://www.winimage.com/zLibDll/unzip.html 84http://www.winimage.com/zLibDll/unzip.html
85and also in the 85and also in the
86.I contrib/minizip 86.I contrib/minizip
87directory of the main 87directory of the main
88.I zlib 88.I zlib
89web site. 89web site.
90.SH "SEE ALSO" 90.SH "SEE ALSO"
91The 91The
92.I zlib 92.I zlib
93web site can be found at either of these locations: 93web site can be found at either of these locations:
94.IP 94.IP
95http://www.zlib.org 95http://www.zlib.org
96.br 96.br
97http://www.gzip.org/zlib/ 97http://www.gzip.org/zlib/
98.LP 98.LP
99The data format used by the zlib library is described by RFC 99The data format used by the zlib library is described by RFC
100(Request for Comments) 1950 to 1952 in the files: 100(Request for Comments) 1950 to 1952 in the files:
101.IP 101.IP
102http://www.ietf.org/rfc/rfc1950.txt (concerning zlib format) 102http://www.ietf.org/rfc/rfc1950.txt (concerning zlib format)
103.br 103.br
104http://www.ietf.org/rfc/rfc1951.txt (concerning deflate format) 104http://www.ietf.org/rfc/rfc1951.txt (concerning deflate format)
105.br 105.br
106http://www.ietf.org/rfc/rfc1952.txt (concerning gzip format) 106http://www.ietf.org/rfc/rfc1952.txt (concerning gzip format)
107.LP 107.LP
108These documents are also available in other formats from: 108These documents are also available in other formats from:
109.IP 109.IP
110ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html 110ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
111.LP 111.LP
112Mark Nelson (markn@ieee.org) wrote an article about 112Mark Nelson (markn@ieee.org) wrote an article about
113.I zlib 113.I zlib
114for the Jan. 1997 issue of Dr. Dobb's Journal; 114for the Jan. 1997 issue of Dr. Dobb's Journal;
115a copy of the article is available at: 115a copy of the article is available at:
116.IP 116.IP
117http://dogma.net/markn/articles/zlibtool/zlibtool.htm 117http://dogma.net/markn/articles/zlibtool/zlibtool.htm
118.SH "REPORTING PROBLEMS" 118.SH "REPORTING PROBLEMS"
119Before reporting a problem, 119Before reporting a problem,
120please check the 120please check the
121.I zlib 121.I zlib
122web site to verify that you have the latest version of 122web site to verify that you have the latest version of
123.IR zlib ; 123.IR zlib ;
124otherwise, 124otherwise,
125obtain the latest version and see if the problem still exists. 125obtain the latest version and see if the problem still exists.
126Please read the 126Please read the
127.I zlib 127.I zlib
128FAQ at: 128FAQ at:
129.IP 129.IP
130http://www.gzip.org/zlib/zlib_faq.html 130http://www.gzip.org/zlib/zlib_faq.html
131.LP 131.LP
132before asking for help. 132before asking for help.
133Send questions and/or comments to zlib@gzip.org, 133Send questions and/or comments to zlib@gzip.org,
134or (for the Windows DLL version) to Gilles Vollant (info@winimage.com). 134or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
135.SH AUTHORS 135.SH AUTHORS
136Version 1.2.3 136Version 1.2.3
137Copyright (C) 1995-2005 Jean-loup Gailly (jloup@gzip.org) 137Copyright (C) 1995-2005 Jean-loup Gailly (jloup@gzip.org)
138and Mark Adler (madler@alumni.caltech.edu). 138and Mark Adler (madler@alumni.caltech.edu).
139.LP 139.LP
140This software is provided "as-is," 140This software is provided "as-is,"
141without any express or implied warranty. 141without any express or implied warranty.
142In no event will the authors be held liable for any damages 142In no event will the authors be held liable for any damages
143arising from the use of this software. 143arising from the use of this software.
144See the distribution directory with respect to requirements 144See the distribution directory with respect to requirements
145governing redistribution. 145governing redistribution.
146The deflate format used by 146The deflate format used by
147.I zlib 147.I zlib
148was defined by Phil Katz. 148was defined by Phil Katz.
149The deflate and 149The deflate and
150.I zlib 150.I zlib
151specifications were written by L. Peter Deutsch. 151specifications were written by L. Peter Deutsch.
152Thanks to all the people who reported problems and suggested various 152Thanks to all the people who reported problems and suggested various
153improvements in 153improvements in
154.IR zlib ; 154.IR zlib ;
155who are too numerous to cite here. 155who are too numerous to cite here.
156.LP 156.LP
157UNIX manual page by R. P. C. Rodgers, 157UNIX manual page by R. P. C. Rodgers,
158U.S. National Library of Medicine (rodgers@nlm.nih.gov). 158U.S. National Library of Medicine (rodgers@nlm.nih.gov).
159.\" end of man page 159.\" end of man page