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README

      1 ZLIB DATA COMPRESSION LIBRARY
      2 
      3 zlib 1.2.8 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 (a] 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 (a] gzip.org>, or to Gilles Vollant
     23 <info (a] 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 (a] 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 1.2.8 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 (a] 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 (a] 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 (a] 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) 1995-2013 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 (a] gzip.org          madler (a] 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.
    116