147 lines
6.9 KiB
Text
Executable file
147 lines
6.9 KiB
Text
Executable file
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.
|