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zlib 1.1.3 is a general purpose data compression library.  All the code

is thread safe.  The data format used by the zlib library

is described by RFCs (Request for Comments) 1950 to 1952 in the files

ftp://ds.internic.net/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate

format) and rfc1952.txt (gzip format). These documents are also available in

other formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html

All functions of the compression library are documented in the file zlib.h

(volunteer to write man pages welcome, contact jloup@gzip.org). A usage

example of the library is given in the file example.c which also tests that

the library is working correctly. Another example is given in the file

minigzip.c. The compression library itself is composed of all source files

except example.c and minigzip.c.

To compile all files and run the test program, follow the instructions

given at the top of Makefile. In short "make test; make install"

should work for most machines. For Unix: "configure; make test; make install"

For MSDOS, use one of the special makefiles such as Makefile.msc.

For VMS, use Make_vms.com or descrip.mms.

Questions about zlib should be sent to , or to

Gilles Vollant  for the Windows DLL version.

The zlib home page is http://www.cdrom.com/pub/infozip/zlib/

The official zlib ftp site is ftp://ftp.cdrom.com/pub/infozip/zlib/

Before reporting a problem, please check those sites to verify that

you have the latest version of zlib; otherwise get the latest version and

check whether the problem still exists or not.

Mark Nelson  wrote an article about zlib for the Jan. 1997

issue of  Dr. Dobb's Journal; a copy of the article is available in

http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm

The changes made in version 1.1.3 are documented in the file ChangeLog.

The main changes since 1.1.2 are:

- fix "an inflate input buffer bug that shows up on rare but persistent

  occasions" (Mark)

- fix gzread and gztell for concatenated .gz files (Didier Le Botlan)

- fix gzseek(..., SEEK_SET) in write mode

- fix crc check after a gzeek (Frank Faubert)

- fix miniunzip when the last entry in a zip file is itself a zip file

  (J Lillge)

- add contrib/asm586 and contrib/asm686 (Brian Raiter)

  See http://www.muppetlabs.com/~breadbox/software/assembly.html

- add support for Delphi 3 in contrib/delphi (Bob Dellaca)

- add support for C++Builder 3 and Delphi 3 in contrib/delphi2 (Davide Moretti)

- do not exit prematurely in untgz if 0 at start of block (Magnus Holmgren)

- use macro EXTERN instead of extern to support DLL for BeOS (Sander Stoks)

- added a FAQ file

plus many changes for portability.

Unsupported third party contributions are provided in directory "contrib".

A Java implementation of zlib is available in the Java Development Kit 1.1

http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html

See the zlib home page http://www.cdrom.com/pub/infozip/zlib/ for details.

A Perl interface to zlib written by Paul Marquess 

is in the CPAN (Comprehensive Perl Archive Network) sites, such as:

ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*

A Python interface to zlib written by A.M. Kuchling 

is available in Python 1.5 and later versions, see

http://www.python.org/doc/lib/module-zlib.html

A zlib binding for TCL written by Andreas Kupries 

is availlable at http://www.westend.com/~kupries/doc/trf/man/man.html

An experimental package to read and write files in .zip format,

written on top of zlib by Gilles Vollant , is

available at http://www.winimage.com/zLibDll/unzip.html

and also in the contrib/minizip directory of zlib.

Notes for some targets:

- To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc

  and all .c files except example.c and minigzip.c; compile with -DZLIB_DLL

  The zlib DLL support was initially done by Alessandro Iacopetti and is

  now maintained by Gilles Vollant . Check the zlib DLL

  home page at http://www.winimage.com/zLibDll

  From Visual Basic, you can call the DLL functions which do not take

  a structure as argument: compress, uncompress and all gz* functions.

  See contrib/visual-basic.txt for more information, or get

  http://www.tcfb.com/dowseware/cmp-z-it.zip

- For 64-bit Irix, deflate.c must be compiled without any optimization.

  With -O, one libpng test fails. The test works in 32 bit mode (with

  the -n32 compiler flag). The compiler bug has been reported to SGI.

- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1

  it works when compiled with cc.

- on Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1

  is necessary to get gzprintf working correctly. This is done by configure.

- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works

  with other compilers. Use "make test" to check your compiler.

- gzdopen is not supported on RISCOS, BEOS and by some Mac compilers.

- For Turbo C the small model is supported only with reduced performance to

  avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3

- For PalmOs, see http://www.cs.uit.no/~perm/PASTA/pilot/software.html

  Per Harald Myrvang 

Acknowledgments:

  The deflate format used by zlib was defined by Phil Katz. The deflate

  and zlib specifications were written by L. Peter Deutsch. Thanks to all the

  people who reported problems and suggested various improvements in zlib;

  they are too numerous to cite here.

Copyright notice:

 (C) 1995-1998 Jean-loup Gailly and Mark Adler

  This software is provided 'as-is', without any express or implied

  warranty.  In no event will the authors be held liable for any damages

  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,

  including commercial applications, and to alter it and redistribute it

  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not

     claim that you wrote the original software. If you use this software

     in a product, an acknowledgment in the product documentation would be

     appreciated but is not required.

  2. Altered source versions must be plainly marked as such, and must not be

     misrepresented as being the original software.

  3. This notice may not be removed or altered from any source distribution.

  Jean-loup Gailly        Mark Adler

  jloup@gzip.org          madler@alumni.caltech.edu

If you use the zlib library in a product, we would appreciate *not*

receiving lengthy legal documents to sign. The sources are provided

for free but without warranty of any kind.  The library has been

entirely written by Jean-loup Gailly and Mark Adler; it does not

include third-party code.

If you redistribute modified sources, we would appreciate that you include

in the file ChangeLog history information documenting your changes.