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ZLIB DATA COMPRESSION LIBRARY
zlib 1�2�8 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 les http://tools.
ietf.org/html/rfc1950 (zlib format), rfc1951 (deate
format) and rfc1952 (gzip format)�
All functions of the compression library are
documented in the le zlib.h (volunteer to write
man pages welcome, contact zlib@gzip�org)� A
usage example of the library is given in the le test/
example�c which also tests that the library is working
correctly. Another example is given in the le test/
minigzip�c� The compression library itself is composed
of all source les in the root directory.
To compile all les and run the test program, follow
the instructions given at the top of Makele.in. In short
″./congure; make test″, and if that goes well, ″make
install″ should work for most avors of Unix. For
Windows, use one of the special makeles in win32/
or contrib/vstudio/ � For VMS, use make_vms�com�
Questions about zlib should be sent to <zlib@gzip�
org>, or to Gilles Vollant <info@winimage�com> for
the Windows DLL version� The zlib home page is
http://zlib�net/ � Before reporting a problem, please
check this site to verify that you have the latest
version of zlib; otherwise get the latest version and
check whether the problem still exists or not�
PLEASE read the zlib FAQ http://zlib�net/zlib_faq�
html before asking for help�
Mark Nelson <markn@ieee�org> wrote an article
about zlib for the Jan� 1997 issue of Dr� Dobb’s
Journal; a copy of the article is available at http://
marknelson�us/1997/01/01/zlib-engine/ �
The changes made in version 1�2�8 are documented
in the le ChangeLog.
Unsupported third party contributions are provided
in directory contrib/ �
zlib is available in Java using the java�util�zip package,
documented at http://java�sun�com/developer/
technicalArticles/Programming/compression/ �
A Perl interface to zlib written by Paul Marquess
<pmqs@cpan�org> is available at CPAN
(Comprehensive Perl Archive Network) sites, including
http://search�cpan�org/~pmqs/IO-Compress-Zlib/ �
A Python interface to zlib written by A�M�Kuchling
<amk@amk�ca> is available in Python 1�5 and later
versions, see http://docs�python�org/library/zlib�html �
zlib is built into tcl: http://wiki�tcl�tk/4610 �
An experimental package to read and write les in
�zip format, written on top of zlib by Gilles Vollant
<info@winimage�com>, is available in the contrib/
minizip directory of zlib�
Notes for some targets:
- For Windows DLL versions, please see win32/
DLL_FAQ�txt
-
For 64-bit Irix, deate.c must be compiled without any
optimization� With - O, one libpng test fails� The test
works in 32 bit mode (with the -n32 compiler ag).
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 congure.
- 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 or BEOS�
- For PalmOs, see http://palmzlib�sourceforge�net/
Acknowledgments:
The deate format used by zlib was dened by
Phil Katz. The deate and zlib specications 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) 1995-2013 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 modied sources, we would
appreciate that you include in the le ChangeLog
history information documenting your changes�
Please read the FAQ for more information on the
distribution of modied source versions.