README
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- zlib 1.1.4 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 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 <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 1.1.4 are documented in the file ChangeLog.
- The only changes made since 1.1.3 are bug corrections:
- - ZFREE was repeated on same allocation on some error conditions.
- This creates a security problem described in
- http://www.zlib.org/advisory-2002-03-11.txt
- - Returned incorrect error (Z_MEM_ERROR) on some invalid data
- - Avoid accesses before window for invalid distances with inflate window
- less than 32K.
- - force windowBits > 8 to avoid a bug in the encoder for a window size
- of 256 bytes. (A complete fix will be available in 1.1.5).
- The beta version 1.1.5beta includes many more changes. A new official
- version 1.1.5 will be released as soon as extensive testing has been
- completed on it.
- Unsupported third party contributions are provided in directory "contrib".
- A Java implementation of zlib is available in the Java Development Kit
- http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
- See the zlib home page http://www.zlib.org for details.
- A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
- 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@magnet.com>
- 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.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 <info@winimage.com>, 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 <info@winimage.com>. 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 <perm@stud.cs.uit.no>
- 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) 1995-2002 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.