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1 ZLIB DATA COMPRESSION LIBRARY
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2
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3 zlib 1.2.8 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 zlib@gzip.org). 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 <zlib@gzip.org>, or to Gilles Vollant
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23 <info@winimage.com> 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 <markn@ieee.org> 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 http://marknelson.us/1997/01/01/zlib-engine/ .
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33
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34 The changes made in version 1.2.8 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, documented at
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39 http://java.sun.com/developer/technicalArticles/Programming/compression/ .
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40
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41 A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
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42 at CPAN (Comprehensive Perl Archive Network) sites, including
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43 http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
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44
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45 A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
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46 available in Python 1.5 and later versions, see
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47 http://docs.python.org/library/zlib.html .
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48
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49 zlib is built into tcl: http://wiki.tcl.tk/4610 .
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50
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51 An experimental package to read and write files in .zip format, written on top
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52 of zlib by Gilles Vollant <info@winimage.com>, is available in the
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53 contrib/minizip directory of zlib.
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54
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55
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56 Notes for some targets:
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57
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58 - For Windows DLL versions, please see win32/DLL_FAQ.txt
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59
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60 - For 64-bit Irix, deflate.c must be compiled without any optimization. With
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61 -O, one libpng test fails. The test works in 32 bit mode (with the -n32
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62 compiler flag). The compiler bug has been reported to SGI.
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63
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64 - 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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65 when compiled with cc.
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66
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67 - On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
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68 necessary to get gzprintf working correctly. This is done by configure.
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69
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70 - zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
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71 other compilers. Use "make test" to check your compiler.
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72
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73 - gzdopen is not supported on RISCOS or BEOS.
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74
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75 - For PalmOs, see http://palmzlib.sourceforge.net/
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76
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77
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78 Acknowledgments:
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79
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80 The deflate format used by zlib was defined by Phil Katz. The deflate and
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81 zlib specifications were written by L. Peter Deutsch. Thanks to all the
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82 people who reported problems and suggested various improvements in zlib; they
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83 are too numerous to cite here.
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84
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85 Copyright notice:
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86
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87 (C) 1995-2013 Jean-loup Gailly and Mark Adler
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88
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89 This software is provided 'as-is', without any express or implied
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90 warranty. In no event will the authors be held liable for any damages
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91 arising from the use of this software.
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92
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93 Permission is granted to anyone to use this software for any purpose,
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94 including commercial applications, and to alter it and redistribute it
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95 freely, subject to the following restrictions:
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96
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97 1. The origin of this software must not be misrepresented; you must not
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98 claim that you wrote the original software. If you use this software
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99 in a product, an acknowledgment in the product documentation would be
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100 appreciated but is not required.
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101 2. Altered source versions must be plainly marked as such, and must not be
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102 misrepresented as being the original software.
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103 3. This notice may not be removed or altered from any source distribution.
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104
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105 Jean-loup Gailly Mark Adler
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106 jloup@gzip.org madler@alumni.caltech.edu
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107
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108 If you use the zlib library in a product, we would appreciate *not* receiving
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109 lengthy legal documents to sign. The sources are provided for free but without
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110 warranty of any kind. The library has been entirely written by Jean-loup
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111 Gailly and Mark Adler; it does not include third-party code.
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112
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113 If you redistribute modified sources, we would appreciate that you include in
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114 the file ChangeLog history information documenting your changes. Please read
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115 the FAQ for more information on the distribution of modified source versions.
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