README - third_party/github.com/madler/zlib - Git at Google

 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.
	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.