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1 ZLIB DATA COMPRESSION LIBRARY
3 zlib 1.2.3 is a general purpose data compression library. All the code is
4 thread safe. The data format used by the zlib library is described by RFCs
5 (Request for Comments) 1950 to 1952 in the files
6 http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format)
7 and rfc1952.txt (gzip format). These documents are also available in other
8 formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
10 All functions of the compression library are documented in the file zlib.h
11 (volunteer to write man pages welcome, contact firstname.lastname@example.org). A usage example
12 of the library is given in the file example.c which also tests that the library
13 is working correctly. Another example is given in the file minigzip.c. The
14 compression library itself is composed of all source files except example.c and
17 To compile all files and run the test program, follow the instructions given at
18 the top of Makefile. In short "make test; make install" should work for most
19 machines. For Unix: "./configure; make test; make install". For MSDOS, use one
20 of the special makefiles such as Makefile.msc. For VMS, use make_vms.com.
22 Questions about zlib should be sent to <email@example.com>, or to Gilles Vollant
23 <firstname.lastname@example.org> for the Windows DLL version. The zlib home page is
24 http://www.zlib.org or http://www.gzip.org/zlib/ Before reporting a problem,
25 please check this site to verify that you have the latest version of zlib;
26 otherwise get the latest version and check whether the problem still exists or
29 PLEASE read the zlib FAQ http://www.gzip.org/zlib/zlib_faq.html before asking
30 for help.
32 Mark Nelson <email@example.com> wrote an article about zlib for the Jan. 1997
33 issue of Dr. Dobb's Journal; a copy of the article is available in
36 The changes made in version 1.2.3 are documented in the file ChangeLog.
38 Unsupported third party contributions are provided in directory "contrib".
40 A Java implementation of zlib is available in the Java Development Kit
42 See the zlib home page http://www.zlib.org for details.
44 A Perl interface to zlib written by Paul Marquess <firstname.lastname@example.org> is in the
45 CPAN (Comprehensive Perl Archive Network) sites
48 A Python interface to zlib written by A.M. Kuchling <email@example.com> is
49 available in Python 1.5 and later versions, see
52 A zlib binding for TCL written by Andreas Kupries <firstname.lastname@example.org> is
53 availlable at http://www.oche.de/~akupries/soft/trf/trf_zip.html
55 An experimental package to read and write files in .zip format, written on top
56 of zlib by Gilles Vollant <email@example.com>, is available in the
57 contrib/minizip directory of zlib.
60 Notes for some targets:
62 - For Windows DLL versions, please see win32/DLL_FAQ.txt
64 - For 64-bit Irix, deflate.c must be compiled without any optimization. With
65 -O, one libpng test fails. The test works in 32 bit mode (with the -n32
66 compiler flag). The compiler bug has been reported to SGI.
68 - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
69 when compiled with cc.
71 - On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
72 necessary to get gzprintf working correctly. This is done by configure.
74 - zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
75 other compilers. Use "make test" to check your compiler.
77 - gzdopen is not supported on RISCOS, BEOS and by some Mac compilers.
79 - For PalmOs, see http://palmzlib.sourceforge.net/
81 - When building a shared, i.e. dynamic library on Mac OS X, the library must be
82 installed before testing (do "make install" before "make test"), since the
83 library location is specified in the library.
88 The deflate format used by zlib was defined by Phil Katz. The deflate
89 and zlib specifications were written by L. Peter Deutsch. Thanks to all the
90 people who reported problems and suggested various improvements in zlib;
91 they are too numerous to cite here.
93 Copyright notice:
95 (C) 1995-2004 Jean-loup Gailly and Mark Adler
97 This software is provided 'as-is', without any express or implied
98 warranty. In no event will the authors be held liable for any damages
99 arising from the use of this software.
101 Permission is granted to anyone to use this software for any purpose,
102 including commercial applications, and to alter it and redistribute it
103 freely, subject to the following restrictions:
105 1. The origin of this software must not be misrepresented; you must not
106 claim that you wrote the original software. If you use this software
107 in a product, an acknowledgment in the product documentation would be
108 appreciated but is not required.
109 2. Altered source versions must be plainly marked as such, and must not be
110 misrepresented as being the original software.
111 3. This notice may not be removed or altered from any source distribution.
113 Jean-loup Gailly Mark Adler
114 firstname.lastname@example.org email@example.com
116 If you use the zlib library in a product, we would appreciate *not*
117 receiving lengthy legal documents to sign. The sources are provided
118 for free but without warranty of any kind. The library has been
119 entirely written by Jean-loup Gailly and Mark Adler; it does not
120 include third-party code.
122 If you redistribute modified sources, we would appreciate that you include
123 in the file ChangeLog history information documenting your changes. Please
124 read the FAQ for more information on the distribution of modified source