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zlib 1.0.1 is a general purpose data compression library. All the code
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is reentrant (thread safe). The data format used by the zlib library
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is described in the files zlib-3.3.doc, deflate-1.3.doc and
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gzip-4.3.doc, available in various formats from
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ftp://swrinde.nde.swri.edu/pub/png/documents/zlib/
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All functions of the compression library are documented in the file
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zlib.h. A usage example of the library is given in the file example.c
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which also tests that the library is working correctly. Another
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example is given in the file minigzip.c. The compression library itself
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is composed of all source files except example.c and minigzip.c.
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To compile all files and run the test program, follow the instructions
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given at the top of Makefile. In short "make test; make install"
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should work for most machines. For MSDOS, use one of the special
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makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms.
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Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov> or,
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if this fails, to the addresses given below in the Copyright section.
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The changes made in version 1.0.1 are documented in the file ChangeLog.
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Version number 1.0 was skipped to avoid confusion with version 0.99
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which had some references to 1.0 already. The main changes since 0.99 are:
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- fix array overlay in deflate.c which sometimes caused bad compressed data
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- fix inflate bug with empty stored block
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- fix MSDOS medium model which was broken in 0.99
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- fix deflateParams() which could generated bad compressed data.
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- added an INDEX file
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- new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
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Watcom (Makefile.wat), Amiga SAS/C (Makefile.sas)
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- several portability improvements
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Notes for some targets:
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- For Turbo C the small model is supported only with reduced performance to
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avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
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- For 64-bit Iris, deflate.c must be compiled without any optimization.
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With -O, one libpng test fails. The test works in 32 bit mode (with
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the -32 compiler flag).
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- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1
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it works when compiled with cc.
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- zlib doesn't work on HP-UX 9.05 with one cc compiler (the one not
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accepting the -O option). It works with the other cc compiler.
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A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
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is in the CPAN (Comprehensive Perl Archive Network) sites, such as:
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ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
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Acknowledgments:
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The deflate format used by zlib was defined by Phil Katz. The deflate
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and zlib specifications were written by Peter Deutsch. Thanks to all the
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people who reported problems and suggested various improvements in zlib;
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they are too numerous to cite here.
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Copyright notice:
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(C) 1995-1996 Jean-loup Gailly and Mark Adler
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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Jean-loup Gailly Mark Adler
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gzip@prep.ai.mit.edu madler@alumni.caltech.edu
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If you use the zlib library in a product, we would appreciate *not*
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receiving lengthy legal documents to sign. The sources are provided
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for free but without warranty of any kind. The library has been
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entirely written by Jean-loup Gailly and Mark Adler; it does not
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include third-party code.
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If you redistribute modified sources, we would appreciate that you include
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in the file ChangeLog history information documenting your changes.
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