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1.TH ZLIB 3 "19 March 1998"
2.SH NAME
3zlib \- compression/decompression library
4.SH SYNOPSIS
5[see
6.I zlib.h
7for full description]
8.SH DESCRIPTION
9The
10.I zlib
11library is a general purpose data compression library.
12The code is thread safe.
13It provides in-memory compression and decompression functions,
14including integrity checks of the uncompressed data.
15This version of the library supports only one compression method (deflation)
16but other algorithms will be added later and will have the same stream interface.
17.LP
18Compression can be done in a single step if the buffers are large enough
19(for example if an input file is mmap'ed),
20or can be done by repeated calls of the compression function.
21In the latter case,
22the application must provide more input and/or consume the output
23(providing more output space) before each call.
24.LP
25The library also supports reading and writing files in
26.I gzip
27(.gz) format
28with an interface similar to that of stdio.
29.LP
30The library does not install any signal handler. The decoder checks
31the consistency of the compressed data, so the library should never
32crash even in case of corrupted input.
33.LP
34All functions of the compression library are documented in the file
35.IR zlib.h.
36The distribution source includes examples of use of the library
37the files
38.I example.c
39and
40.IR minigzip.c .
41.LP
42A Java implementation of
43.IR zlib
44is available in the Java Development Kit 1.1
45.IP
46http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
47.LP
48A Perl interface to
49.IR zlib ,
50written by Paul Marquess (pmarquess@bfsec.bt.co.uk)
51is available at CPAN (Comprehensive Perl Archive Network) sites,
52such as:
53.IP
54ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
55.LP
56A Python interface to
57.IR zlib
58written by A.M. Kuchling <amk@magnet.com>
59is available from the Python Software Association sites, such as:
60.IP
61ftp://ftp.python.org/pub/python/contrib/Encoding/zlib*.tar.gz
62.SH "SEE ALSO"
63Questions about zlib should be sent to:
64.IP
65zlib@quest.jpl.nasa.gov
66or, if this fails, to the author addresses given below.
67The zlib home page is:
68.IP
69http://www.cdrom.com/pub/infozip/zlib/
70.LP
71The data format used by the zlib library is described by RFC
72(Request for Comments) 1950 to 1952 in the files:
73.IP
74ftp://ds.internic.net/rfc/rfc1950.txt (zlib format)
75.br
76rfc1951.txt (deflate format)
77.br
78rfc1952.txt (gzip format)
79.LP
80These documents are also available in other formats from:
81.IP
82ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
83.SH AUTHORS
84Version 1.1.2
85Copyright (C) 1995-1998 Jean-loup Gailly (jloup@gzip.org)
86and Mark Adler (madler@alumni.caltech.edu).
87.LP
88This software is provided "as-is,"
89without any express or implied warranty.
90In no event will the authors be held liable for any damages
91arising from the use of this software.
92See the distribution directory with respect to requirements
93governing redistribution.
94The deflate format used by
95.I zlib
96was defined by Phil Katz.
97The deflate and
98.I zlib
99specifications were written by L. Peter Deutsch.
100Thanks to all the people who reported problems and suggested various
101improvements in
102.IR zlib ;
103who are too numerous to cite here.
104.LP
105UNIX manual page by R. P. C. Rodgers,
106U.S. National Library of Medicine (rodgers@nlm.nih.gov).
107.\" end of man page