|
cannam@89
|
1 ZLIB DATA COMPRESSION LIBRARY
|
|
cannam@89
|
2
|
|
cannam@89
|
3 zlib 1.2.7 is a general purpose data compression library. All the code is
|
|
cannam@89
|
4 thread safe. The data format used by the zlib library is described by RFCs
|
|
cannam@89
|
5 (Request for Comments) 1950 to 1952 in the files
|
|
cannam@89
|
6 http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and
|
|
cannam@89
|
7 rfc1952 (gzip format).
|
|
cannam@89
|
8
|
|
cannam@89
|
9 All functions of the compression library are documented in the file zlib.h
|
|
cannam@89
|
10 (volunteer to write man pages welcome, contact zlib@gzip.org). A usage example
|
|
cannam@89
|
11 of the library is given in the file test/example.c which also tests that
|
|
cannam@89
|
12 the library is working correctly. Another example is given in the file
|
|
cannam@89
|
13 test/minigzip.c. The compression library itself is composed of all source
|
|
cannam@89
|
14 files in the root directory.
|
|
cannam@89
|
15
|
|
cannam@89
|
16 To compile all files and run the test program, follow the instructions given at
|
|
cannam@89
|
17 the top of Makefile.in. In short "./configure; make test", and if that goes
|
|
cannam@89
|
18 well, "make install" should work for most flavors of Unix. For Windows, use
|
|
cannam@89
|
19 one of the special makefiles in win32/ or contrib/vstudio/ . For VMS, use
|
|
cannam@89
|
20 make_vms.com.
|
|
cannam@89
|
21
|
|
cannam@89
|
22 Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant
|
|
cannam@89
|
23 <info@winimage.com> for the Windows DLL version. The zlib home page is
|
|
cannam@89
|
24 http://zlib.net/ . Before reporting a problem, please check this site to
|
|
cannam@89
|
25 verify that you have the latest version of zlib; otherwise get the latest
|
|
cannam@89
|
26 version and check whether the problem still exists or not.
|
|
cannam@89
|
27
|
|
cannam@89
|
28 PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.
|
|
cannam@89
|
29
|
|
cannam@89
|
30 Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
|
|
cannam@89
|
31 issue of Dr. Dobb's Journal; a copy of the article is available at
|
|
cannam@89
|
32 http://marknelson.us/1997/01/01/zlib-engine/ .
|
|
cannam@89
|
33
|
|
cannam@89
|
34 The changes made in version 1.2.7 are documented in the file ChangeLog.
|
|
cannam@89
|
35
|
|
cannam@89
|
36 Unsupported third party contributions are provided in directory contrib/ .
|
|
cannam@89
|
37
|
|
cannam@89
|
38 zlib is available in Java using the java.util.zip package, documented at
|
|
cannam@89
|
39 http://java.sun.com/developer/technicalArticles/Programming/compression/ .
|
|
cannam@89
|
40
|
|
cannam@89
|
41 A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
|
|
cannam@89
|
42 at CPAN (Comprehensive Perl Archive Network) sites, including
|
|
cannam@89
|
43 http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
|
|
cannam@89
|
44
|
|
cannam@89
|
45 A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
|
|
cannam@89
|
46 available in Python 1.5 and later versions, see
|
|
cannam@89
|
47 http://docs.python.org/library/zlib.html .
|
|
cannam@89
|
48
|
|
cannam@89
|
49 zlib is built into tcl: http://wiki.tcl.tk/4610 .
|
|
cannam@89
|
50
|
|
cannam@89
|
51 An experimental package to read and write files in .zip format, written on top
|
|
cannam@89
|
52 of zlib by Gilles Vollant <info@winimage.com>, is available in the
|
|
cannam@89
|
53 contrib/minizip directory of zlib.
|
|
cannam@89
|
54
|
|
cannam@89
|
55
|
|
cannam@89
|
56 Notes for some targets:
|
|
cannam@89
|
57
|
|
cannam@89
|
58 - For Windows DLL versions, please see win32/DLL_FAQ.txt
|
|
cannam@89
|
59
|
|
cannam@89
|
60 - For 64-bit Irix, deflate.c must be compiled without any optimization. With
|
|
cannam@89
|
61 -O, one libpng test fails. The test works in 32 bit mode (with the -n32
|
|
cannam@89
|
62 compiler flag). The compiler bug has been reported to SGI.
|
|
cannam@89
|
63
|
|
cannam@89
|
64 - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
|
|
cannam@89
|
65 when compiled with cc.
|
|
cannam@89
|
66
|
|
cannam@89
|
67 - On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
|
|
cannam@89
|
68 necessary to get gzprintf working correctly. This is done by configure.
|
|
cannam@89
|
69
|
|
cannam@89
|
70 - zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
|
|
cannam@89
|
71 other compilers. Use "make test" to check your compiler.
|
|
cannam@89
|
72
|
|
cannam@89
|
73 - gzdopen is not supported on RISCOS or BEOS.
|
|
cannam@89
|
74
|
|
cannam@89
|
75 - For PalmOs, see http://palmzlib.sourceforge.net/
|
|
cannam@89
|
76
|
|
cannam@89
|
77
|
|
cannam@89
|
78 Acknowledgments:
|
|
cannam@89
|
79
|
|
cannam@89
|
80 The deflate format used by zlib was defined by Phil Katz. The deflate and
|
|
cannam@89
|
81 zlib specifications were written by L. Peter Deutsch. Thanks to all the
|
|
cannam@89
|
82 people who reported problems and suggested various improvements in zlib; they
|
|
cannam@89
|
83 are too numerous to cite here.
|
|
cannam@89
|
84
|
|
cannam@89
|
85 Copyright notice:
|
|
cannam@89
|
86
|
|
cannam@89
|
87 (C) 1995-2012 Jean-loup Gailly and Mark Adler
|
|
cannam@89
|
88
|
|
cannam@89
|
89 This software is provided 'as-is', without any express or implied
|
|
cannam@89
|
90 warranty. In no event will the authors be held liable for any damages
|
|
cannam@89
|
91 arising from the use of this software.
|
|
cannam@89
|
92
|
|
cannam@89
|
93 Permission is granted to anyone to use this software for any purpose,
|
|
cannam@89
|
94 including commercial applications, and to alter it and redistribute it
|
|
cannam@89
|
95 freely, subject to the following restrictions:
|
|
cannam@89
|
96
|
|
cannam@89
|
97 1. The origin of this software must not be misrepresented; you must not
|
|
cannam@89
|
98 claim that you wrote the original software. If you use this software
|
|
cannam@89
|
99 in a product, an acknowledgment in the product documentation would be
|
|
cannam@89
|
100 appreciated but is not required.
|
|
cannam@89
|
101 2. Altered source versions must be plainly marked as such, and must not be
|
|
cannam@89
|
102 misrepresented as being the original software.
|
|
cannam@89
|
103 3. This notice may not be removed or altered from any source distribution.
|
|
cannam@89
|
104
|
|
cannam@89
|
105 Jean-loup Gailly Mark Adler
|
|
cannam@89
|
106 jloup@gzip.org madler@alumni.caltech.edu
|
|
cannam@89
|
107
|
|
cannam@89
|
108 If you use the zlib library in a product, we would appreciate *not* receiving
|
|
cannam@89
|
109 lengthy legal documents to sign. The sources are provided for free but without
|
|
cannam@89
|
110 warranty of any kind. The library has been entirely written by Jean-loup
|
|
cannam@89
|
111 Gailly and Mark Adler; it does not include third-party code.
|
|
cannam@89
|
112
|
|
cannam@89
|
113 If you redistribute modified sources, we would appreciate that you include in
|
|
cannam@89
|
114 the file ChangeLog history information documenting your changes. Please read
|
|
cannam@89
|
115 the FAQ for more information on the distribution of modified source versions.
|
