README
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- ZLIB DATA COMPRESSION LIBRARY
- zlib 1.2.3 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
- http://www.ietf.org/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 zlib@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.
- 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://www.zlib.org or http://www.gzip.org/zlib/ 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://www.gzip.org/zlib/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 in
- http://dogma.net/markn/articles/zlibtool/zlibtool.htm
- The changes made in version 1.2.3 are documented in the file ChangeLog.
- Unsupported third party contributions are provided in directory "contrib".
- A Java implementation of zlib is available in the Java Development Kit
- http://java.sun.com/j2se/1.4.2/docs/api/java/util/zip/package-summary.html
- See the zlib home page http://www.zlib.org for details.
- A Perl interface to zlib written by Paul Marquess <pmqs@cpan.org> is in the
- CPAN (Comprehensive Perl Archive Network) sites
- http://www.cpan.org/modules/by-module/Compress/
- A Python interface to zlib written by A.M. Kuchling <amk@amk.ca> 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 <a.kupries@westend.com> is
- availlable at http://www.oche.de/~akupries/soft/trf/trf_zip.html
- An experimental package to read and write files 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, 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 PalmOs, see http://palmzlib.sourceforge.net/
- - When building a shared, i.e. dynamic library on Mac OS X, the library must be
- installed before testing (do "make install" before "make test"), since the
- library location is specified in the library.
- 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) 1995-2004 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. Please
- read the FAQ for more information on the distribution of modified source
- versions.