zlib 1.1.4 is a general purpose data compression library.  All the codeis thread safe.  The data format used by the zlib libraryis described by RFCs (Request for Comments) 1950 to 1952 in the files http://www.ietf.org/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflateformat) and rfc1952.txt (gzip format). These documents are also available inother formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.htmlAll functions of the compression library are documented in the file zlib.h(volunteer to write man pages welcome, contact jloup@gzip.org). A usageexample of the library is given in the file example.c which also tests thatthe library is working correctly. Another example is given in the fileminigzip.c. The compression library itself is composed of all source filesexcept example.c and minigzip.c.To compile all files and run the test program, follow the instructionsgiven 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 toGilles 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 thatyou have the latest version of zlib; otherwise get the latest version andcheck whether the problem still exists or not.PLEASE read the zlib FAQ http://www.gzip.org/zlib/zlib_faq.htmlbefore asking for help.Mark Nelson <markn@ieee.org> wrote an article about zlib for the Jan. 1997issue of  Dr. Dobb's Journal; a copy of the article is available inhttp://dogma.net/markn/articles/zlibtool/zlibtool.htmThe 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 officialversion 1.1.5 will be released as soon as extensive testing has beencompleted on it.Unsupported third party contributions are provided in directory "contrib".A Java implementation of zlib is available in the Java Development Kithttp://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.htmlSee 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) siteshttp://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, seehttp://www.python.org/doc/lib/module-zlib.htmlA zlib binding for TCL written by Andreas Kupries <a.kupries@westend.com>is availlable at http://www.westend.com/~kupries/doc/trf/man/man.htmlAn experimental package to read and write files in .zip format,written on top of zlib by Gilles Vollant <info@winimage.com>, isavailable at http://www.winimage.com/zLibDll/unzip.htmland 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.eduIf you use the zlib library in a product, we would appreciate *not*receiving lengthy legal documents to sign. The sources are providedfor free but without warranty of any kind.  The library has beenentirely written by Jean-loup Gailly and Mark Adler; it does notinclude third-party code.If you redistribute modified sources, we would appreciate that you includein the file ChangeLog history information documenting your changes.