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1 | ZLIB DATA COMPRESSION LIBRARY | ||
2 | |||
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 | ||
9 | |||
10 | All functions of the compression library are documented in the file zlib.h | ||
11 | (volunteer to write man pages welcome, contact zlib@gzip.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 | ||
15 | minigzip.c. | ||
16 | |||
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. | ||
21 | |||
22 | Questions about zlib should be sent to <zlib@gzip.org>, or to Gilles Vollant | ||
23 | <info@winimage.com> 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 | ||
27 | not. | ||
28 | |||
29 | PLEASE read the zlib FAQ http://www.gzip.org/zlib/zlib_faq.html before asking | ||
30 | for help. | ||
31 | |||
32 | Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997 | ||
33 | issue of Dr. Dobb's Journal; a copy of the article is available in | ||
34 | http://dogma.net/markn/articles/zlibtool/zlibtool.htm | ||
35 | |||
36 | The changes made in version 1.2.3 are documented in the file ChangeLog. | ||
37 | |||
38 | Unsupported third party contributions are provided in directory "contrib". | ||
39 | |||
40 | A Java implementation of zlib is available in the Java Development Kit | ||
41 | http://java.sun.com/j2se/1.4.2/docs/api/java/util/zip/package-summary.html | ||
42 | See the zlib home page http://www.zlib.org for details. | ||
43 | |||
44 | A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is in the | ||
45 | CPAN (Comprehensive Perl Archive Network) sites | ||
46 | http://www.cpan.org/modules/by-module/Compress/ | ||
47 | |||
48 | A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is | ||
49 | available in Python 1.5 and later versions, see | ||
50 | http://www.python.org/doc/lib/module-zlib.html | ||
51 | |||
52 | A zlib binding for TCL written by Andreas Kupries <a.kupries@westend.com> is | ||
53 | availlable at http://www.oche.de/~akupries/soft/trf/trf_zip.html | ||
54 | |||
55 | An experimental package to read and write files in .zip format, written on top | ||
56 | of zlib by Gilles Vollant <info@winimage.com>, is available in the | ||
57 | contrib/minizip directory of zlib. | ||
58 | |||
59 | |||
60 | Notes for some targets: | ||
61 | |||
62 | - For Windows DLL versions, please see win32/DLL_FAQ.txt | ||
63 | |||
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. | ||
67 | |||
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. | ||
70 | |||
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. | ||
73 | |||
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. | ||
76 | |||
77 | - gzdopen is not supported on RISCOS, BEOS and by some Mac compilers. | ||
78 | |||
79 | - For PalmOs, see http://palmzlib.sourceforge.net/ | ||
80 | |||
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. | ||
84 | |||
85 | |||
86 | Acknowledgments: | ||
87 | |||
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. | ||
92 | |||
93 | Copyright notice: | ||
94 | |||
95 | (C) 1995-2004 Jean-loup Gailly and Mark Adler | ||
96 | |||
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. | ||
100 | |||
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: | ||
104 | |||
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. | ||
112 | |||
113 | Jean-loup Gailly Mark Adler | ||
114 | jloup@gzip.org madler@alumni.caltech.edu | ||
115 | |||
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. | ||
121 | |||
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 | ||
125 | versions. | ||