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| 1 | +ZLIB DATA COMPRESSION LIBRARY |
| 2 | + |
| 3 | +zlib 1.2.13 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://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and |
| 7 | +rfc1952 (gzip format). |
| 8 | + |
| 9 | +All functions of the compression library are documented in the file zlib.h |
| 10 | +(volunteer to write man pages welcome, contact [email protected]). A usage example |
| 11 | +of the library is given in the file test/example.c which also tests that |
| 12 | +the library is working correctly. Another example is given in the file |
| 13 | +test/minigzip.c. The compression library itself is composed of all source |
| 14 | +files in the root directory. |
| 15 | + |
| 16 | +To compile all files and run the test program, follow the instructions given at |
| 17 | +the top of Makefile.in. In short "./configure; make test", and if that goes |
| 18 | +well, "make install" should work for most flavors of Unix. For Windows, use |
| 19 | +one of the special makefiles in win32/ or contrib/vstudio/ . For VMS, use |
| 20 | +make_vms.com. |
| 21 | + |
| 22 | +Questions about zlib should be sent to < [email protected]>, or to Gilles Vollant |
| 23 | +< [email protected]> for the Windows DLL version. The zlib home page is |
| 24 | +http://zlib.net/ . Before reporting a problem, please check this site to |
| 25 | +verify that you have the latest version of zlib; otherwise get the latest |
| 26 | +version and check whether the problem still exists or not. |
| 27 | + |
| 28 | +PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help. |
| 29 | + |
| 30 | +Mark Nelson < [email protected]> wrote an article about zlib for the Jan. 1997 |
| 31 | +issue of Dr. Dobb's Journal; a copy of the article is available at |
| 32 | +http://marknelson.us/1997/01/01/zlib-engine/ . |
| 33 | + |
| 34 | +The changes made in version 1.2.13 are documented in the file ChangeLog. |
| 35 | + |
| 36 | +Unsupported third party contributions are provided in directory contrib/ . |
| 37 | + |
| 38 | +zlib is available in Java using the java.util.zip package, documented at |
| 39 | +http://java.sun.com/developer/technicalArticles/Programming/compression/ . |
| 40 | + |
| 41 | +A Perl interface to zlib written by Paul Marquess < [email protected]> is available |
| 42 | +at CPAN (Comprehensive Perl Archive Network) sites, including |
| 43 | +http://search.cpan.org/~pmqs/IO-Compress-Zlib/ . |
| 44 | + |
| 45 | +A Python interface to zlib written by A.M. Kuchling < [email protected]> is |
| 46 | +available in Python 1.5 and later versions, see |
| 47 | +http://docs.python.org/library/zlib.html . |
| 48 | + |
| 49 | +zlib is built into tcl: http://wiki.tcl.tk/4610 . |
| 50 | + |
| 51 | +An experimental package to read and write files in .zip format, written on top |
| 52 | +of zlib by Gilles Vollant < [email protected]>, is available in the |
| 53 | +contrib/minizip directory of zlib. |
| 54 | + |
| 55 | + |
| 56 | +Notes for some targets: |
| 57 | + |
| 58 | +- For Windows DLL versions, please see win32/DLL_FAQ.txt |
| 59 | + |
| 60 | +- For 64-bit Irix, deflate.c must be compiled without any optimization. With |
| 61 | + -O, one libpng test fails. The test works in 32 bit mode (with the -n32 |
| 62 | + compiler flag). The compiler bug has been reported to SGI. |
| 63 | + |
| 64 | +- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works |
| 65 | + when compiled with cc. |
| 66 | + |
| 67 | +- On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is |
| 68 | + necessary to get gzprintf working correctly. This is done by configure. |
| 69 | + |
| 70 | +- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with |
| 71 | + other compilers. Use "make test" to check your compiler. |
| 72 | + |
| 73 | +- gzdopen is not supported on RISCOS or BEOS. |
| 74 | + |
| 75 | +- For PalmOs, see http://palmzlib.sourceforge.net/ |
| 76 | + |
| 77 | + |
| 78 | +Acknowledgments: |
| 79 | + |
| 80 | + The deflate format used by zlib was defined by Phil Katz. The deflate and |
| 81 | + zlib specifications were written by L. Peter Deutsch. Thanks to all the |
| 82 | + people who reported problems and suggested various improvements in zlib; they |
| 83 | + are too numerous to cite here. |
| 84 | + |
| 85 | +Copyright notice: |
| 86 | + |
| 87 | + (C) 1995-2022 Jean-loup Gailly and Mark Adler |
| 88 | + |
| 89 | + This software is provided 'as-is', without any express or implied |
| 90 | + warranty. In no event will the authors be held liable for any damages |
| 91 | + arising from the use of this software. |
| 92 | + |
| 93 | + Permission is granted to anyone to use this software for any purpose, |
| 94 | + including commercial applications, and to alter it and redistribute it |
| 95 | + freely, subject to the following restrictions: |
| 96 | + |
| 97 | + 1. The origin of this software must not be misrepresented; you must not |
| 98 | + claim that you wrote the original software. If you use this software |
| 99 | + in a product, an acknowledgment in the product documentation would be |
| 100 | + appreciated but is not required. |
| 101 | + 2. Altered source versions must be plainly marked as such, and must not be |
| 102 | + misrepresented as being the original software. |
| 103 | + 3. This notice may not be removed or altered from any source distribution. |
| 104 | + |
| 105 | + Jean-loup Gailly Mark Adler |
| 106 | + |
| 107 | + |
| 108 | +If you use the zlib library in a product, we would appreciate *not* receiving |
| 109 | +lengthy legal documents to sign. The sources are provided for free but without |
| 110 | +warranty of any kind. The library has been entirely written by Jean-loup |
| 111 | +Gailly and Mark Adler; it does not include third-party code. We make all |
| 112 | +contributions to and distributions of this project solely in our personal |
| 113 | +capacity, and are not conveying any rights to any intellectual property of |
| 114 | +any third parties. |
| 115 | + |
| 116 | +If you redistribute modified sources, we would appreciate that you include in |
| 117 | +the file ChangeLog history information documenting your changes. Please read |
| 118 | +the FAQ for more information on the distribution of modified source versions. |
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