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author | fraserofthenight |
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date | Mon, 06 Jul 2009 08:06:28 -0700 |
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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. |