1*22ce4affSfengbojiangZLIB DATA COMPRESSION LIBRARY 2*22ce4affSfengbojiang 3*22ce4affSfengbojiangzlib 1.2.11 is a general purpose data compression library. All the code is 4*22ce4affSfengbojiangthread safe. The data format used by the zlib library is described by RFCs 5*22ce4affSfengbojiang(Request for Comments) 1950 to 1952 in the files 6*22ce4affSfengbojianghttp://tools.ietf.org/html/rfc1950 (zlib format), rfc1951 (deflate format) and 7*22ce4affSfengbojiangrfc1952 (gzip format). 8*22ce4affSfengbojiang 9*22ce4affSfengbojiangAll functions of the compression library are documented in the file zlib.h 10*22ce4affSfengbojiang(volunteer to write man pages welcome, contact [email protected]). A usage example 11*22ce4affSfengbojiangof the library is given in the file test/example.c which also tests that 12*22ce4affSfengbojiangthe library is working correctly. Another example is given in the file 13*22ce4affSfengbojiangtest/minigzip.c. The compression library itself is composed of all source 14*22ce4affSfengbojiangfiles in the root directory. 15*22ce4affSfengbojiang 16*22ce4affSfengbojiangTo compile all files and run the test program, follow the instructions given at 17*22ce4affSfengbojiangthe top of Makefile.in. In short "./configure; make test", and if that goes 18*22ce4affSfengbojiangwell, "make install" should work for most flavors of Unix. For Windows, use 19*22ce4affSfengbojiangone of the special makefiles in win32/ or contrib/vstudio/ . For VMS, use 20*22ce4affSfengbojiangmake_vms.com. 21*22ce4affSfengbojiang 22*22ce4affSfengbojiangQuestions about zlib should be sent to <[email protected]>, or to Gilles Vollant 23*22ce4affSfengbojiang<[email protected]> for the Windows DLL version. The zlib home page is 24*22ce4affSfengbojianghttp://zlib.net/ . Before reporting a problem, please check this site to 25*22ce4affSfengbojiangverify that you have the latest version of zlib; otherwise get the latest 26*22ce4affSfengbojiangversion and check whether the problem still exists or not. 27*22ce4affSfengbojiang 28*22ce4affSfengbojiangPLEASE read the zlib FAQ http://zlib.net/zlib_faq.html before asking for help. 29*22ce4affSfengbojiang 30*22ce4affSfengbojiangMark Nelson <[email protected]> wrote an article about zlib for the Jan. 1997 31*22ce4affSfengbojiangissue of Dr. Dobb's Journal; a copy of the article is available at 32*22ce4affSfengbojianghttp://marknelson.us/1997/01/01/zlib-engine/ . 33*22ce4affSfengbojiang 34*22ce4affSfengbojiangThe changes made in version 1.2.11 are documented in the file ChangeLog. 35*22ce4affSfengbojiang 36*22ce4affSfengbojiangUnsupported third party contributions are provided in directory contrib/ . 37*22ce4affSfengbojiang 38*22ce4affSfengbojiangzlib is available in Java using the java.util.zip package, documented at 39*22ce4affSfengbojianghttp://java.sun.com/developer/technicalArticles/Programming/compression/ . 40*22ce4affSfengbojiang 41*22ce4affSfengbojiangA Perl interface to zlib written by Paul Marquess <[email protected]> is available 42*22ce4affSfengbojiangat CPAN (Comprehensive Perl Archive Network) sites, including 43*22ce4affSfengbojianghttp://search.cpan.org/~pmqs/IO-Compress-Zlib/ . 44*22ce4affSfengbojiang 45*22ce4affSfengbojiangA Python interface to zlib written by A.M. Kuchling <[email protected]> is 46*22ce4affSfengbojiangavailable in Python 1.5 and later versions, see 47*22ce4affSfengbojianghttp://docs.python.org/library/zlib.html . 48*22ce4affSfengbojiang 49*22ce4affSfengbojiangzlib is built into tcl: http://wiki.tcl.tk/4610 . 50*22ce4affSfengbojiang 51*22ce4affSfengbojiangAn experimental package to read and write files in .zip format, written on top 52*22ce4affSfengbojiangof zlib by Gilles Vollant <[email protected]>, is available in the 53*22ce4affSfengbojiangcontrib/minizip directory of zlib. 54*22ce4affSfengbojiang 55*22ce4affSfengbojiang 56*22ce4affSfengbojiangNotes for some targets: 57*22ce4affSfengbojiang 58*22ce4affSfengbojiang- For Windows DLL versions, please see win32/DLL_FAQ.txt 59*22ce4affSfengbojiang 60*22ce4affSfengbojiang- For 64-bit Irix, deflate.c must be compiled without any optimization. With 61*22ce4affSfengbojiang -O, one libpng test fails. The test works in 32 bit mode (with the -n32 62*22ce4affSfengbojiang compiler flag). The compiler bug has been reported to SGI. 63*22ce4affSfengbojiang 64*22ce4affSfengbojiang- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 it works 65*22ce4affSfengbojiang when compiled with cc. 66*22ce4affSfengbojiang 67*22ce4affSfengbojiang- On Digital Unix 4.0D (formely OSF/1) on AlphaServer, the cc option -std1 is 68*22ce4affSfengbojiang necessary to get gzprintf working correctly. This is done by configure. 69*22ce4affSfengbojiang 70*22ce4affSfengbojiang- zlib doesn't work on HP-UX 9.05 with some versions of /bin/cc. It works with 71*22ce4affSfengbojiang other compilers. Use "make test" to check your compiler. 72*22ce4affSfengbojiang 73*22ce4affSfengbojiang- gzdopen is not supported on RISCOS or BEOS. 74*22ce4affSfengbojiang 75*22ce4affSfengbojiang- For PalmOs, see http://palmzlib.sourceforge.net/ 76*22ce4affSfengbojiang 77*22ce4affSfengbojiang 78*22ce4affSfengbojiangAcknowledgments: 79*22ce4affSfengbojiang 80*22ce4affSfengbojiang The deflate format used by zlib was defined by Phil Katz. The deflate and 81*22ce4affSfengbojiang zlib specifications were written by L. Peter Deutsch. Thanks to all the 82*22ce4affSfengbojiang people who reported problems and suggested various improvements in zlib; they 83*22ce4affSfengbojiang are too numerous to cite here. 84*22ce4affSfengbojiang 85*22ce4affSfengbojiangCopyright notice: 86*22ce4affSfengbojiang 87*22ce4affSfengbojiang (C) 1995-2017 Jean-loup Gailly and Mark Adler 88*22ce4affSfengbojiang 89*22ce4affSfengbojiang This software is provided 'as-is', without any express or implied 90*22ce4affSfengbojiang warranty. In no event will the authors be held liable for any damages 91*22ce4affSfengbojiang arising from the use of this software. 92*22ce4affSfengbojiang 93*22ce4affSfengbojiang Permission is granted to anyone to use this software for any purpose, 94*22ce4affSfengbojiang including commercial applications, and to alter it and redistribute it 95*22ce4affSfengbojiang freely, subject to the following restrictions: 96*22ce4affSfengbojiang 97*22ce4affSfengbojiang 1. The origin of this software must not be misrepresented; you must not 98*22ce4affSfengbojiang claim that you wrote the original software. If you use this software 99*22ce4affSfengbojiang in a product, an acknowledgment in the product documentation would be 100*22ce4affSfengbojiang appreciated but is not required. 101*22ce4affSfengbojiang 2. Altered source versions must be plainly marked as such, and must not be 102*22ce4affSfengbojiang misrepresented as being the original software. 103*22ce4affSfengbojiang 3. This notice may not be removed or altered from any source distribution. 104*22ce4affSfengbojiang 105*22ce4affSfengbojiang Jean-loup Gailly Mark Adler 106*22ce4affSfengbojiang [email protected] [email protected] 107*22ce4affSfengbojiang 108*22ce4affSfengbojiangIf you use the zlib library in a product, we would appreciate *not* receiving 109*22ce4affSfengbojianglengthy legal documents to sign. The sources are provided for free but without 110*22ce4affSfengbojiangwarranty of any kind. The library has been entirely written by Jean-loup 111*22ce4affSfengbojiangGailly and Mark Adler; it does not include third-party code. 112*22ce4affSfengbojiang 113*22ce4affSfengbojiangIf you redistribute modified sources, we would appreciate that you include in 114*22ce4affSfengbojiangthe file ChangeLog history information documenting your changes. Please read 115*22ce4affSfengbojiangthe FAQ for more information on the distribution of modified source versions. 116