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    1: ZLIB DATA COMPRESSION LIBRARY
    2: 
    3: zlib 1.2.3 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://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate format)
    7: and rfc1952.txt (gzip format). These documents are also available in other
    8: formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
    9: 
   10: All functions of the compression library are documented in the file zlib.h
   11: (volunteer to write man pages welcome, contact zlib@gzip.org). A usage example
   12: of the library is given in the file example.c which also tests that the library
   13: is working correctly. Another example is given in the file minigzip.c. The
   14: compression library itself is composed of all source files except example.c and
   15: minigzip.c.
   16: 
   17: To compile all files and run the test program, follow the instructions given at
   18: the top of Makefile. In short "make test; make install" should work for most
   19: machines. For Unix: "./configure; make test; make install". For MSDOS, use one
   20: of the special makefiles such as Makefile.msc. For VMS, use 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://www.zlib.org or http://www.gzip.org/zlib/ Before reporting a problem,
   25: please check this site to verify that you have the latest version of zlib;
   26: otherwise get the latest version and check whether the problem still exists or
   27: not.
   28: 
   29: PLEASE read the zlib FAQ http://www.gzip.org/zlib/zlib_faq.html before asking
   30: for help.
   31: 
   32: Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997
   33: issue of  Dr. Dobb's Journal; a copy of the article is available in
   34: http://dogma.net/markn/articles/zlibtool/zlibtool.htm
   35: 
   36: The changes made in version 1.2.3 are documented in the file ChangeLog.
   37: 
   38: Unsupported third party contributions are provided in directory "contrib".
   39: 
   40: A Java implementation of zlib is available in the Java Development Kit
   41: http://java.sun.com/j2se/1.4.2/docs/api/java/util/zip/package-summary.html
   42: See the zlib home page http://www.zlib.org for details.
   43: 
   44: A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is in the
   45: CPAN (Comprehensive Perl Archive Network) sites
   46: http://www.cpan.org/modules/by-module/Compress/
   47: 
   48: A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> is
   49: available in Python 1.5 and later versions, see
   50: http://www.python.org/doc/lib/module-zlib.html
   51: 
   52: A zlib binding for TCL written by Andreas Kupries <a.kupries@westend.com> is
   53: availlable at http://www.oche.de/~akupries/soft/trf/trf_zip.html
   54: 
   55: An experimental package to read and write files in .zip format, written on top
   56: of zlib by Gilles Vollant <info@winimage.com>, is available in the
   57: contrib/minizip directory of zlib.
   58: 
   59: 
   60: Notes for some targets:
   61: 
   62: - For Windows DLL versions, please see win32/DLL_FAQ.txt
   63: 
   64: - For 64-bit Irix, deflate.c must be compiled without any optimization. With
   65:   -O, one libpng test fails. The test works in 32 bit mode (with the -n32
   66:   compiler flag). The compiler bug has been reported to SGI.
   67: 
   68: - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works
   69:   when compiled with cc.
   70: 
   71: - On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is
   72:   necessary to get gzprintf working correctly. This is done by configure.
   73: 
   74: - zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with
   75:   other compilers. Use "make test" to check your compiler.
   76: 
   77: - gzdopen is not supported on RISCOS, BEOS and by some Mac compilers.
   78: 
   79: - For PalmOs, see http://palmzlib.sourceforge.net/
   80: 
   81: - When building a shared, i.e. dynamic library on Mac OS X, the library must be
   82:   installed before testing (do "make install" before "make test"), since the
   83:   library location is specified in the library.
   84: 
   85: 
   86: Acknowledgments:
   87: 
   88:   The deflate format used by zlib was defined by Phil Katz. The deflate
   89:   and zlib specifications were written by L. Peter Deutsch. Thanks to all the
   90:   people who reported problems and suggested various improvements in zlib;
   91:   they are too numerous to cite here.
   92: 
   93: Copyright notice:
   94: 
   95:  (C) 1995-2004 Jean-loup Gailly and Mark Adler
   96: 
   97:   This software is provided 'as-is', without any express or implied
   98:   warranty.  In no event will the authors be held liable for any damages
   99:   arising from the use of this software.
  100: 
  101:   Permission is granted to anyone to use this software for any purpose,
  102:   including commercial applications, and to alter it and redistribute it
  103:   freely, subject to the following restrictions:
  104: 
  105:   1. The origin of this software must not be misrepresented; you must not
  106:      claim that you wrote the original software. If you use this software
  107:      in a product, an acknowledgment in the product documentation would be
  108:      appreciated but is not required.
  109:   2. Altered source versions must be plainly marked as such, and must not be
  110:      misrepresented as being the original software.
  111:   3. This notice may not be removed or altered from any source distribution.
  112: 
  113:   Jean-loup Gailly        Mark Adler
  114:   jloup@gzip.org          madler@alumni.caltech.edu
  115: 
  116: If you use the zlib library in a product, we would appreciate *not*
  117: receiving lengthy legal documents to sign. The sources are provided
  118: for free but without warranty of any kind.  The library has been
  119: entirely written by Jean-loup Gailly and Mark Adler; it does not
  120: include third-party code.
  121: 
  122: If you redistribute modified sources, we would appreciate that you include
  123: in the file ChangeLog history information documenting your changes. Please
  124: read the FAQ for more information on the distribution of modified source
  125: versions.