Mercurial > hgrepos > Python2 > PyMuPDF

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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
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1 ZLIB DATA COMPRESSION LIBRARY
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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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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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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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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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28 PLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help.
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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 https://marknelson.us/posts/1997/01/01/zlib-engine.html .
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34 The changes made in version 1.3.1 are documented in the file ChangeLog.
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36 Unsupported third party contributions are provided in directory contrib/ .
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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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41 A Perl interface to zlib and bzip2 written by Paul Marquess <pmqs@cpan.org>
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42 can be found at https://github.com/pmqs/IO-Compress .
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44 A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> 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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48 zlib is built into tcl: http://wiki.tcl.tk/4610 .
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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 <info@winimage.com>, is available in the
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52 contrib/minizip directory of zlib.
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55 Notes for some targets:
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57 - For Windows DLL versions, please see win32/DLL_FAQ.txt
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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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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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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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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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72 - gzdopen is not supported on RISCOS or BEOS.
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74 - For PalmOs, see http://palmzlib.sourceforge.net/
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77 Acknowledgments:
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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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84 Copyright notice:
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86 (C) 1995-2024 Jean-loup Gailly and Mark Adler
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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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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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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 jloup@gzip.org madler@alumni.caltech.edu
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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.