| 1 | .TH ZLIB 3 "15 Jan 2017"
|
|---|
| 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, assuming that the standard library functions
|
|---|
| 13 | used are thread safe, such as memory allocation routines.
|
|---|
| 14 | It provides in-memory compression and decompression functions,
|
|---|
| 15 | including integrity checks of the uncompressed data.
|
|---|
| 16 | This version of the library supports only one compression method (deflation)
|
|---|
| 17 | but other algorithms may be added later
|
|---|
| 18 | with the same stream interface.
|
|---|
| 19 | .LP
|
|---|
| 20 | Compression can be done in a single step if the buffers are large enough
|
|---|
| 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 the 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 test/example.c
|
|---|
| 40 | and
|
|---|
| 41 | .IR test/minigzip.c,
|
|---|
| 42 | as well as other examples in the
|
|---|
| 43 | .IR examples/
|
|---|
| 44 | directory.
|
|---|
| 45 | .LP
|
|---|
| 46 | Changes to this version are documented in the file
|
|---|
| 47 | .I ChangeLog
|
|---|
| 48 | that accompanies the source.
|
|---|
| 49 | .LP
|
|---|
| 50 | .I zlib
|
|---|
| 51 | is built in to many languages and operating systems, including but not limited to
|
|---|
| 52 | Java, Python, .NET, PHP, Perl, Ruby, Swift, and Go.
|
|---|
| 53 | .LP
|
|---|
| 54 | An experimental package to read and write files in the .zip format,
|
|---|
| 55 | written on top of
|
|---|
| 56 | .I zlib
|
|---|
| 57 | by Gilles Vollant ([email protected]),
|
|---|
| 58 | is available at:
|
|---|
| 59 | .IP
|
|---|
| 60 | http://www.winimage.com/zLibDll/minizip.html
|
|---|
| 61 | and also in the
|
|---|
| 62 | .I contrib/minizip
|
|---|
| 63 | directory of the main
|
|---|
| 64 | .I zlib
|
|---|
| 65 | source distribution.
|
|---|
| 66 | .SH "SEE ALSO"
|
|---|
| 67 | The
|
|---|
| 68 | .I zlib
|
|---|
| 69 | web site can be found at:
|
|---|
| 70 | .IP
|
|---|
| 71 | http://zlib.net/
|
|---|
| 72 | .LP
|
|---|
| 73 | The data format used by the
|
|---|
| 74 | .I zlib
|
|---|
| 75 | library is described by RFC
|
|---|
| 76 | (Request for Comments) 1950 to 1952 in the files:
|
|---|
| 77 | .IP
|
|---|
| 78 | http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format)
|
|---|
| 79 | .br
|
|---|
| 80 | http://tools.ietf.org/html/rfc1951 (for the deflate compressed data format)
|
|---|
| 81 | .br
|
|---|
| 82 | http://tools.ietf.org/html/rfc1952 (for the gzip header and trailer format)
|
|---|
| 83 | .LP
|
|---|
| 84 | Mark Nelson wrote an article about
|
|---|
| 85 | .I zlib
|
|---|
| 86 | for the Jan. 1997 issue of Dr. Dobb's Journal;
|
|---|
| 87 | a copy of the article is available at:
|
|---|
| 88 | .IP
|
|---|
| 89 | http://marknelson.us/1997/01/01/zlib-engine/
|
|---|
| 90 | .SH "REPORTING PROBLEMS"
|
|---|
| 91 | Before reporting a problem,
|
|---|
| 92 | please check the
|
|---|
| 93 | .I zlib
|
|---|
| 94 | web site to verify that you have the latest version of
|
|---|
| 95 | .IR zlib ;
|
|---|
| 96 | otherwise,
|
|---|
| 97 | obtain the latest version and see if the problem still exists.
|
|---|
| 98 | Please read the
|
|---|
| 99 | .I zlib
|
|---|
| 100 | FAQ at:
|
|---|
| 101 | .IP
|
|---|
| 102 | http://zlib.net/zlib_faq.html
|
|---|
| 103 | .LP
|
|---|
| 104 | before asking for help.
|
|---|
| 105 | Send questions and/or comments to [email protected],
|
|---|
| 106 | or (for the Windows DLL version) to Gilles Vollant ([email protected]).
|
|---|
| 107 | .SH AUTHORS AND LICENSE
|
|---|
| 108 | Version 1.2.11
|
|---|
| 109 | .LP
|
|---|
| 110 | Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
|
|---|
| 111 | .LP
|
|---|
| 112 | This software is provided 'as-is', without any express or implied
|
|---|
| 113 | warranty. In no event will the authors be held liable for any damages
|
|---|
| 114 | arising from the use of this software.
|
|---|
| 115 | .LP
|
|---|
| 116 | Permission is granted to anyone to use this software for any purpose,
|
|---|
| 117 | including commercial applications, and to alter it and redistribute it
|
|---|
| 118 | freely, subject to the following restrictions:
|
|---|
| 119 | .LP
|
|---|
| 120 | .nr step 1 1
|
|---|
| 121 | .IP \n[step]. 3
|
|---|
| 122 | The origin of this software must not be misrepresented; you must not
|
|---|
| 123 | claim that you wrote the original software. If you use this software
|
|---|
| 124 | in a product, an acknowledgment in the product documentation would be
|
|---|
| 125 | appreciated but is not required.
|
|---|
| 126 | .IP \n+[step].
|
|---|
| 127 | Altered source versions must be plainly marked as such, and must not be
|
|---|
| 128 | misrepresented as being the original software.
|
|---|
| 129 | .IP \n+[step].
|
|---|
| 130 | This notice may not be removed or altered from any source distribution.
|
|---|
| 131 | .LP
|
|---|
| 132 | Jean-loup Gailly Mark Adler
|
|---|
| 133 | .br
|
|---|
| 134 | [email protected] [email protected]
|
|---|
| 135 | .LP
|
|---|
| 136 | The deflate format used by
|
|---|
| 137 | .I zlib
|
|---|
| 138 | was defined by Phil Katz.
|
|---|
| 139 | The deflate and
|
|---|
| 140 | .I zlib
|
|---|
| 141 | specifications were written by L. Peter Deutsch.
|
|---|
| 142 | Thanks to all the people who reported problems and suggested various
|
|---|
| 143 | improvements in
|
|---|
| 144 | .IR zlib ;
|
|---|
| 145 | who are too numerous to cite here.
|
|---|
| 146 | .LP
|
|---|
| 147 | UNIX manual page by R. P. C. Rodgers,
|
|---|
| 148 | U.S. National Library of Medicine ([email protected]).
|
|---|
| 149 | .\" end of man page
|
|---|
