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