README
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- zlib 1.0.4 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 zlib home page is http://quest.jpl.nasa.gov/zlib/
- The changes made in version 1.0.4 are documented in the file ChangeLog.
- The main changes since 1.0.3 are:
- - In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
- bit, so the decompressor could decompress all the correct data but went
- on to attempt decompressing extra garbage data. This affected minigzip too.
- - zlibVersion and gzerror return const char* (needed for DLL)
- - port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno)
- 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). 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.
- - 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@email.alessandria.alpcom.it> http://lisa.unial.it/iaco ,
- or contact Brad Clarke <bclarke@cyberus.ca>.
- - gzdopen is not supported on RISCOS
- 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.