| zlib 1.0.2 is a general purpose data compression library. All the code |
| is reentrant (thread safe). The data format used by the zlib library |
| is described by RFCs (Request for Comments) 1950 to 1952 in the files |
| ftp://ds.internic.net/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. 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 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@quest.jpl.nasa.gov> or, |
| if this fails, to the addresses given below in the Copyright section. |
| |
| The changes made in version 1.0.2 are documented in the file ChangeLog. |
| The main changes since 0.99 are: |
| |
| - fix array overlay in deflate.c which sometimes caused bad compressed data |
| - fix inflate bug with empty stored block |
| - fix MSDOS medium model which was broken in 0.99 |
| - fix deflateParams() which could generated bad compressed data. |
| - added an INDEX file |
| - new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32), |
| Watcom (Makefile.wat), Amiga SAS/C (Makefile.sas) |
| - several portability improvements |
| - added algorithm.doc |
| - added Windows DLL support |
| - added a function zlibVersion (for the DLL support) |
| |
| A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk> |
| is in the CPAN (Comprehensive Perl Archive Network) sites, such as: |
| ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib* |
| |
| |
| Notes for some targets: |
| |
| - 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 64-bit Iris, deflate.c must be compiled without any optimization. |
| With -O, one libpng test fails. The test works in 32 bit mode (with |
| the -32 compiler flag). |
| |
| - 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. |
| |
| - zlib doesn't work on HP-UX 9.05 with one cc compiler (the one not |
| accepting the -O option). It works with the other cc compiler. |
| |
| - 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 |
| For help on building a zlib DLL, contact Alessandro Iacopetti |
| <iaco@cicladi.unial.it> |
| |
| |
| Acknowledgments: |
| |
| The deflate format used by zlib was defined by Phil Katz. The deflate |
| and zlib specifications were written by 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) 1995-1996 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 |
| gzip@prep.ai.mit.edu 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. |