1ZLIB DATA COMPRESSION LIBRARY 2 3zlib 1.3.1 is a general purpose data compression library. All the code is 4thread safe. The data format used by the zlib library is described by RFCs 5(Request for Comments) 1950 to 1952 in the files 6http://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and 7rfc1952 (gzip format). 8 9All functions of the compression library are documented in the file zlib.h 10(volunteer to write man pages welcome, contact zlib@gzip.org). A usage example 11of the library is given in the file test/example.c which also tests that 12the library is working correctly. Another example is given in the file 13test/minigzip.c. The compression library itself is composed of all source 14files in the root directory. 15 16To compile all files and run the test program, follow the instructions given at 17the top of Makefile.in. In short "./configure; make test", and if that goes 18well, "make install" should work for most flavors of Unix. For Windows, use 19one of the special makefiles in win32/ or contrib/vstudio/ . For VMS, use 20make_vms.com. 21 22Questions 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 24http://zlib.net/ . Before reporting a problem, please check this site to 25verify that you have the latest version of zlib; otherwise get the latest 26version and check whether the problem still exists or not. 27 28PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help. 29 30Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997 31issue of Dr. Dobb's Journal; a copy of the article is available at 32https://marknelson.us/posts/1997/01/01/zlib-engine.html . 33 34The changes made in version 1.3.1 are documented in the file ChangeLog. 35 36Unsupported third party contributions are provided in directory contrib/ . 37 38zlib is available in Java using the java.util.zip package. Follow the API 39Documentation link at: https://docs.oracle.com/search/?q=java.util.zip . 40 41A Perl interface to zlib and bzip2 written by Paul Marquess <pmqs@cpan.org> 42can be found at https://github.com/pmqs/IO-Compress . 43 44A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is 45available in Python 1.5 and later versions, see 46http://docs.python.org/library/zlib.html . 47 48zlib is built into tcl: http://wiki.tcl.tk/4610 . 49 50An experimental package to read and write files in .zip format, written on top 51of zlib by Gilles Vollant <info@winimage.com>, is available in the 52contrib/minizip directory of zlib. 53 54 55Notes for some targets: 56 57- For Windows DLL versions, please see win32/DLL_FAQ.txt 58 59- For 64-bit Irix, deflate.c must be compiled without any optimization. With 60 -O, one libpng test fails. The test works in 32 bit mode (with the -n32 61 compiler flag). The compiler bug has been reported to SGI. 62 63- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works 64 when compiled with cc. 65 66- On Digital Unix 4.0D (formerly OSF/1) on AlphaServer, the cc option -std1 is 67 necessary to get gzprintf working correctly. This is done by configure. 68 69- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with 70 other compilers. Use "make test" to check your compiler. 71 72- gzdopen is not supported on RISCOS or BEOS. 73 74- For PalmOs, see http://palmzlib.sourceforge.net/ 75 76 77Acknowledgments: 78 79 The deflate format used by zlib was defined by Phil Katz. The deflate and 80 zlib specifications were written by L. Peter Deutsch. Thanks to all the 81 people who reported problems and suggested various improvements in zlib; they 82 are too numerous to cite here. 83 84Copyright notice: 85 86 (C) 1995-2024 Jean-loup Gailly and Mark Adler 87 88 This software is provided 'as-is', without any express or implied 89 warranty. In no event will the authors be held liable for any damages 90 arising from the use of this software. 91 92 Permission is granted to anyone to use this software for any purpose, 93 including commercial applications, and to alter it and redistribute it 94 freely, subject to the following restrictions: 95 96 1. The origin of this software must not be misrepresented; you must not 97 claim that you wrote the original software. If you use this software 98 in a product, an acknowledgment in the product documentation would be 99 appreciated but is not required. 100 2. Altered source versions must be plainly marked as such, and must not be 101 misrepresented as being the original software. 102 3. This notice may not be removed or altered from any source distribution. 103 104 Jean-loup Gailly Mark Adler 105 jloup@gzip.org madler@alumni.caltech.edu 106 107If you use the zlib library in a product, we would appreciate *not* receiving 108lengthy legal documents to sign. The sources are provided for free but without 109warranty of any kind. The library has been entirely written by Jean-loup 110Gailly and Mark Adler; it does not include third-party code. We make all 111contributions to and distributions of this project solely in our personal 112capacity, and are not conveying any rights to any intellectual property of 113any third parties. 114 115If you redistribute modified sources, we would appreciate that you include in 116the file ChangeLog history information documenting your changes. Please read 117the FAQ for more information on the distribution of modified source versions. 118