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