1 ZLIB DATA COMPRESSION LIBRARY
  2 
  3 zlib 1.3.1 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 zlib@gzip.org).  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 <zlib@gzip.org>, or to Gilles Vollant
 23 <info@winimage.com> 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 <markn@ieee.org> 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 https://marknelson.us/posts/1997/01/01/zlib-engine.html .
 33 
 34 The changes made in version 1.3.1 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. Follow the API
 39 Documentation link at: https://docs.oracle.com/search/?q=java.util.zip .
 40 
 41 A Perl interface to zlib and bzip2 written by Paul Marquess <pmqs@cpan.org>
 42 can be found at https://github.com/pmqs/IO-Compress .
 43 
 44 A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
 45 available in Python 1.5 and later versions, see
 46 http://docs.python.org/library/zlib.html .
 47 
 48 zlib is built into tcl: http://wiki.tcl.tk/4610 .
 49 
 50 An experimental package to read and write files in .zip format, written on top
 51 of zlib by Gilles Vollant <info@winimage.com>, is available in the
 52 contrib/minizip directory of zlib.
 53 
 54 
 55 Notes 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 
 77 Acknowledgments:
 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 
 84 Copyright 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 
107 If you use the zlib library in a product, we would appreciate *not* receiving
108 lengthy legal documents to sign.  The sources are provided for free but without
109 warranty of any kind.  The library has been entirely written by Jean-loup
110 Gailly and Mark Adler; it does not include third-party code.  We make all
111 contributions to and distributions of this project solely in our personal
112 capacity, and are not conveying any rights to any intellectual property of
113 any third parties.
114 
115 If you redistribute modified sources, we would appreciate that you include in
116 the file ChangeLog history information documenting your changes.  Please read
117 the FAQ for more information on the distribution of modified source versions.