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- zlib 1.1.2 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 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@quest.jpl.nasa.gov> or,
- if this fails, to the addresses given below in the Copyright section.
- 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/
- Mark Nelson <markn@tiny.com> 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 1.1.2 are documented in the file ChangeLog.
- The main changes since 1.1.1 are:
-
- - added contrib/minzip, mini zip and unzip based on zlib (Gilles Vollant)
- See http://www.winimage.com/zLibDll/unzip.html
- - preinitialize the inflate tables for fixed codes, to make the code
- completely thread safe (Mark)
- - some simplifications and slight speed-up to the inflate code (Mark)
- - fix gzeof on non-compressed files (Allan Schrum)
- - add -std1 option in configure for OSF1 to fix gzprintf (Martin Mokrejs)
- - use default value of 4K for Z_BUFSIZE for 16-bit MSDOS (Tim Wegner + Glenn)
- - added os2/Makefile.def and os2/zlib.def (Andrew Zabolotny)
- - add shared lib support for UNIX_SV4.2MP (MATSUURA Takanori)
- - do not wrap extern "C" around system includes (Tom Lane)
- - added amiga/Makefile.pup for Amiga powerUP SAS/C PPC (Andreas Kleinert)
- - allow "make install prefix=..." even after configure (Glenn Randers-Pehrson)
- - allow "configure --prefix $HOME" (Tim Mooney)
-
-
- 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 <pmarquess@bfsec.bt.co.uk>
- 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 <amk@magnet.com>
- is available from the Python Software Association sites, such as:
- ftp://ftp.python.org/pub/python/contrib/Encoding/zlib*.tar.gz
-
- 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.
- I don't know how to handle structures in Visual Basic, sorry.
-
- - 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.
-
- - For shared memory multiprocessors, the decompression code assumes that
- writes to pointers are atomic. Also the functions zalloc and zfree passed
- to deflateInit must be multi-threaded in this case.
-
- - 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
-
-
- 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.
-