160 lines
4.4 KiB
Groff
160 lines
4.4 KiB
Groff
|
.TH ZLIB 3 "17 November 2003"
|
||
|
|
.SH NAME
|
||
|
|
zlib \- compression/decompression library
|
||
|
|
.SH SYNOPSIS
|
||
|
|
[see
|
||
|
|
.I zlib.h
|
||
|
|
for full description]
|
||
|
|
.SH DESCRIPTION
|
||
|
|
The
|
||
|
|
.I zlib
|
||
|
|
library is a general purpose data compression library.
|
||
|
|
The code is thread safe.
|
||
|
|
It provides in-memory compression and decompression functions,
|
||
|
|
including integrity checks of the uncompressed data.
|
||
|
|
This version of the library supports only one compression method (deflation)
|
||
|
|
but other algorithms will be added later
|
||
|
|
and will have the same stream interface.
|
||
|
|
.LP
|
||
|
|
Compression can be done in a single step if the buffers are large enough
|
||
|
|
(for example if an input file is mmap'ed),
|
||
|
|
or can be done by repeated calls of the compression function.
|
||
|
|
In the latter case,
|
||
|
|
the application must provide more input and/or consume the output
|
||
|
|
(providing more output space) before each call.
|
||
|
|
.LP
|
||
|
|
The library also supports reading and writing files in
|
||
|
|
.IR gzip (1)
|
||
|
|
(.gz) format
|
||
|
|
with an interface similar to that of stdio.
|
||
|
|
.LP
|
||
|
|
The library does not install any signal handler.
|
||
|
|
The decoder checks the consistency of the compressed data,
|
||
|
|
so the library should never crash even in case of corrupted input.
|
||
|
|
.LP
|
||
|
|
All functions of the compression library are documented in the file
|
||
|
|
.IR zlib.h .
|
||
|
|
The distribution source includes examples of use of the library
|
||
|
|
in the files
|
||
|
|
.I example.c
|
||
|
|
and
|
||
|
|
.IR minigzip.c .
|
||
|
|
.LP
|
||
|
|
Changes to this version are documented in the file
|
||
|
|
.I ChangeLog
|
||
|
|
that accompanies the source,
|
||
|
|
and are concerned primarily with bug fixes and portability enhancements.
|
||
|
|
.LP
|
||
|
|
A Java implementation of
|
||
|
|
.I zlib
|
||
|
|
is available in the Java Development Kit 1.1:
|
||
|
|
.IP
|
||
|
|
http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
|
||
|
|
.LP
|
||
|
|
A Perl interface to
|
||
|
|
.IR zlib ,
|
||
|
|
written by Paul Marquess (pmqs@cpan.org),
|
||
|
|
is available at CPAN (Comprehensive Perl Archive Network) sites,
|
||
|
|
including:
|
||
|
|
.IP
|
||
|
|
http://www.cpan.org/modules/by-module/Compress/
|
||
|
|
.LP
|
||
|
|
A Python interface to
|
||
|
|
.IR zlib ,
|
||
|
|
written by A.M. Kuchling (amk@magnet.com),
|
||
|
|
is available in Python 1.5 and later versions:
|
||
|
|
.IP
|
||
|
|
http://www.python.org/doc/lib/module-zlib.html
|
||
|
|
.LP
|
||
|
|
A
|
||
|
|
.I zlib
|
||
|
|
binding for
|
||
|
|
.IR tcl (1),
|
||
|
|
written by Andreas Kupries (a.kupries@westend.com),
|
||
|
|
is availlable at:
|
||
|
|
.IP
|
||
|
|
http://www.westend.com/~kupries/doc/trf/man/man.html
|
||
|
|
.LP
|
||
|
|
An experimental package to read and write files in .zip format,
|
||
|
|
written on top of
|
||
|
|
.I zlib
|
||
|
|
by Gilles Vollant (info@winimage.com),
|
||
|
|
is available at:
|
||
|
|
.IP
|
||
|
|
http://www.winimage.com/zLibDll/unzip.html
|
||
|
|
and also in the
|
||
|
|
.I contrib/minizip
|
||
|
|
directory of the main
|
||
|
|
.I zlib
|
||
|
|
web site.
|
||
|
|
.SH "SEE ALSO"
|
||
|
|
The
|
||
|
|
.I zlib
|
||
|
|
web site can be found at either of these locations:
|
||
|
|
.IP
|
||
|
|
http://www.zlib.org
|
||
|
|
.br
|
||
|
|
http://www.gzip.org/zlib/
|
||
|
|
.LP
|
||
|
|
The data format used by the zlib library is described by RFC
|
||
|
|
(Request for Comments) 1950 to 1952 in the files:
|
||
|
|
.IP
|
||
|
|
http://www.ietf.org/rfc/rfc1950.txt (concerning zlib format)
|
||
|
|
.br
|
||
|
|
http://www.ietf.org/rfc/rfc1951.txt (concerning deflate format)
|
||
|
|
.br
|
||
|
|
http://www.ietf.org/rfc/rfc1952.txt (concerning gzip format)
|
||
|
|
.LP
|
||
|
|
These documents are also available in other formats from:
|
||
|
|
.IP
|
||
|
|
ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
|
||
|
|
.LP
|
||
|
|
Mark Nelson (markn@ieee.org) wrote an article about
|
||
|
|
.I zlib
|
||
|
|
for the Jan. 1997 issue of Dr. Dobb's Journal;
|
||
|
|
a copy of the article is available at:
|
||
|
|
.IP
|
||
|
|
http://dogma.net/markn/articles/zlibtool/zlibtool.htm
|
||
|
|
.SH "REPORTING PROBLEMS"
|
||
|
|
Before reporting a problem,
|
||
|
|
please check the
|
||
|
|
.I zlib
|
||
|
|
web site to verify that you have the latest version of
|
||
|
|
.IR zlib ;
|
||
|
|
otherwise,
|
||
|
|
obtain the latest version and see if the problem still exists.
|
||
|
|
Please read the
|
||
|
|
.I zlib
|
||
|
|
FAQ at:
|
||
|
|
.IP
|
||
|
|
http://www.gzip.org/zlib/zlib_faq.html
|
||
|
|
.LP
|
||
|
|
before asking for help.
|
||
|
|
Send questions and/or comments to zlib@gzip.org,
|
||
|
|
or (for the Windows DLL version) to Gilles Vollant (info@winimage.com).
|
||
|
|
.SH AUTHORS
|
||
|
|
Version 1.2.1
|
||
|
|
Copyright (C) 1995-2003 Jean-loup Gailly (jloup@gzip.org)
|
||
|
|
and Mark Adler (madler@alumni.caltech.edu).
|
||
|
|
.LP
|
||
|
|
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.
|
||
|
|
See the distribution directory with respect to requirements
|
||
|
|
governing redistribution.
|
||
|
|
The deflate format used by
|
||
|
|
.I zlib
|
||
|
|
was defined by Phil Katz.
|
||
|
|
The deflate and
|
||
|
|
.I zlib
|
||
|
|
specifications were written by L. Peter Deutsch.
|
||
|
|
Thanks to all the people who reported problems and suggested various
|
||
|
|
improvements in
|
||
|
|
.IR zlib ;
|
||
|
|
who are too numerous to cite here.
|
||
|
|
.LP
|
||
|
|
UNIX manual page by R. P. C. Rodgers,
|
||
|
|
U.S. National Library of Medicine (rodgers@nlm.nih.gov).
|
||
|
|
.\" end of man page
|