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    1 ZLIB DATA COMPRESSION LIBRARY
    2 
    3 zlib 1.2.11 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 http://marknelson.us/1997/01/01/zlib-engine/ .
   33 
   34 The changes made in version 1.2.11 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, documented at
   39 http://java.sun.com/developer/technicalArticles/Programming/compression/ .
   40 
   41 A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is available
   42 at CPAN (Comprehensive Perl Archive Network) sites, including
   43 http://search.cpan.org/~pmqs/IO-Compress-Zlib/ .
   44 
   45 A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
   46 available in Python 1.5 and later versions, see
   47 http://docs.python.org/library/zlib.html .
   48 
   49 zlib is built into tcl: http://wiki.tcl.tk/4610 .
   50 
   51 An experimental package to read and write files in .zip format, written on top
   52 of zlib by Gilles Vollant <info@winimage.com>, is available in the
   53 contrib/minizip directory of zlib.
   54 
   55 
   56 Notes for some targets:
   57 
   58 - For Windows DLL versions, please see win32/DLL_FAQ.txt
   59 
   60 - For 64-bit Irix, deflate.c must be compiled without any optimization. With
   61   -O, one libpng test fails. The test works in 32 bit mode (with the -n32
   62   compiler flag). The compiler bug has been reported to SGI.
   63 
   64 - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
   65   when compiled with cc.
   66 
   67 - On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
   68   necessary to get gzprintf working correctly. This is done by configure.
   69 
   70 - zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
   71   other compilers. Use "make test" to check your compiler.
   72 
   73 - gzdopen is not supported on RISCOS or BEOS.
   74 
   75 - For PalmOs, see http://palmzlib.sourceforge.net/
   76 
   77 
   78 Acknowledgments:
   79 
   80   The deflate format used by zlib was defined by Phil Katz.  The deflate and
   81   zlib specifications were written by L.  Peter Deutsch.  Thanks to all the
   82   people who reported problems and suggested various improvements in zlib; they
   83   are too numerous to cite here.
   84 
   85 Copyright notice:
   86 
   87  (C) 1995-2017 Jean-loup Gailly and Mark Adler
   88 
   89   This software is provided 'as-is', without any express or implied
   90   warranty.  In no event will the authors be held liable for any damages
   91   arising from the use of this software.
   92 
   93   Permission is granted to anyone to use this software for any purpose,
   94   including commercial applications, and to alter it and redistribute it
   95   freely, subject to the following restrictions:
   96 
   97   1. The origin of this software must not be misrepresented; you must not
   98      claim that you wrote the original software. If you use this software
   99      in a product, an acknowledgment in the product documentation would be
  100      appreciated but is not required.
  101   2. Altered source versions must be plainly marked as such, and must not be
  102      misrepresented as being the original software.
  103   3. This notice may not be removed or altered from any source distribution.
  104 
  105   Jean-loup Gailly        Mark Adler
  106   jloup@gzip.org          madler@alumni.caltech.edu
  107 
  108 If you use the zlib library in a product, we would appreciate *not* receiving
  109 lengthy legal documents to sign.  The sources are provided for free but without
  110 warranty of any kind.  The library has been entirely written by Jean-loup
  111 Gailly and Mark Adler; it does not include third-party code.
  112 
  113 If you redistribute modified sources, we would appreciate that you include in
  114 the file ChangeLog history information documenting your changes.  Please read
  115 the FAQ for more information on the distribution of modified source versions.