100 lines
4.6 KiB
Plaintext
100 lines
4.6 KiB
Plaintext
|
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.
|