1zlib 1.0.4 is a general purpose data compression library. All the code 2is reentrant (thread safe). The data format used by the zlib library 3is described by RFCs (Request for Comments) 1950 to 1952 in the files 4ftp://ds.internic.net/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate 5format) and rfc1952.txt (gzip format). These documents are also available in 6other formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html 7 8All functions of the compression library are documented in the file 9zlib.h. A usage example of the library is given in the file example.c 10which also tests that the library is working correctly. Another 11example is given in the file minigzip.c. The compression library itself 12is composed of all source files except example.c and minigzip.c. 13 14To compile all files and run the test program, follow the instructions 15given at the top of Makefile. In short "make test; make install" 16should work for most machines. For MSDOS, use one of the special 17makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms. 18 19Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov> or, 20if this fails, to the addresses given below in the Copyright section. 21The zlib home page is http://quest.jpl.nasa.gov/zlib/ 22 23The changes made in version 1.0.4 are documented in the file ChangeLog. 24The main changes since 1.0.3 are: 25 26- In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF 27 bit, so the decompressor could decompress all the correct data but went 28 on to attempt decompressing extra garbage data. This affected minigzip too. 29- zlibVersion and gzerror return const char* (needed for DLL) 30- port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno) 31 32 33A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk> 34is in the CPAN (Comprehensive Perl Archive Network) sites, such as: 35ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib* 36 37 38Notes for some targets: 39 40- For Turbo C the small model is supported only with reduced performance to 41 avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3 42 43- For 64-bit Iris, deflate.c must be compiled without any optimization. 44 With -O, one libpng test fails. The test works in 32 bit mode (with 45 the -32 compiler flag). The compiler bug has been reported to SGI. 46 47- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1 48 it works when compiled with cc. 49 50- zlib doesn't work on HP-UX 9.05 with one cc compiler (the one not 51 accepting the -O option). It works with the other cc compiler. 52 53- To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc 54 and all .c files except example.c and minigzip.c; compile with -DZLIB_DLL 55 For help on building a zlib DLL, contact Alessandro Iacopetti 56 <iaco@email.alessandria.alpcom.it> http://lisa.unial.it/iaco , 57 or contact Brad Clarke <bclarke@cyberus.ca>. 58 59- gzdopen is not supported on RISCOS 60 61 62Acknowledgments: 63 64 The deflate format used by zlib was defined by Phil Katz. The deflate 65 and zlib specifications were written by Peter Deutsch. Thanks to all the 66 people who reported problems and suggested various improvements in zlib; 67 they are too numerous to cite here. 68 69Copyright notice: 70 71 (C) 1995-1996 Jean-loup Gailly and Mark Adler 72 73 This software is provided 'as-is', without any express or implied 74 warranty. In no event will the authors be held liable for any damages 75 arising from the use of this software. 76 77 Permission is granted to anyone to use this software for any purpose, 78 including commercial applications, and to alter it and redistribute it 79 freely, subject to the following restrictions: 80 81 1. The origin of this software must not be misrepresented; you must not 82 claim that you wrote the original software. If you use this software 83 in a product, an acknowledgment in the product documentation would be 84 appreciated but is not required. 85 2. Altered source versions must be plainly marked as such, and must not be 86 misrepresented as being the original software. 87 3. This notice may not be removed or altered from any source distribution. 88 89 Jean-loup Gailly Mark Adler 90 gzip@prep.ai.mit.edu madler@alumni.caltech.edu 91 92If you use the zlib library in a product, we would appreciate *not* 93receiving lengthy legal documents to sign. The sources are provided 94for free but without warranty of any kind. The library has been 95entirely written by Jean-loup Gailly and Mark Adler; it does not 96include third-party code. 97 98If you redistribute modified sources, we would appreciate that you include 99in the file ChangeLog history information documenting your changes. 100