150 lines
4.4 KiB
Groff
150 lines
4.4 KiB
Groff
.TH ZLIB 3 "xx Jan 2017"
|
|
.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, assuming that the standard library functions
|
|
used are thread safe, such as memory allocation routines.
|
|
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 may be added later
|
|
with the same stream interface.
|
|
.LP
|
|
Compression can be done in a single step if the buffers are large enough
|
|
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 the 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 test/example.c
|
|
and
|
|
.IR test/minigzip.c,
|
|
as well as other examples in the
|
|
.IR examples/
|
|
directory.
|
|
.LP
|
|
Changes to this version are documented in the file
|
|
.I ChangeLog
|
|
that accompanies the source.
|
|
.LP
|
|
.I zlib
|
|
is built in to many languages and operating systems, including but not limited to
|
|
Java, Python, .NET, PHP, Perl, Ruby, Swift, and Go.
|
|
.LP
|
|
An experimental package to read and write files in the .zip format,
|
|
written on top of
|
|
.I zlib
|
|
by Gilles Vollant (info@winimage.com),
|
|
is available at:
|
|
.IP
|
|
http://www.winimage.com/zLibDll/minizip.html
|
|
and also in the
|
|
.I contrib/minizip
|
|
directory of the main
|
|
.I zlib
|
|
source distribution.
|
|
.SH "SEE ALSO"
|
|
The
|
|
.I zlib
|
|
web site can be found at:
|
|
.IP
|
|
http://zlib.net/
|
|
.LP
|
|
The data format used by the
|
|
.I zlib
|
|
library is described by RFC
|
|
(Request for Comments) 1950 to 1952 in the files:
|
|
.IP
|
|
http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format)
|
|
.br
|
|
http://tools.ietf.org/html/rfc1951 (for the deflate compressed data format)
|
|
.br
|
|
http://tools.ietf.org/html/rfc1952 (for the gzip header and trailer format)
|
|
.LP
|
|
Mark Nelson 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://marknelson.us/1997/01/01/zlib-engine/
|
|
.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://zlib.net/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 AND LICENSE
|
|
Version 1.2.9.1
|
|
.LP
|
|
Copyright (C) 1995-2017 Jean-loup Gailly and Mark Adler
|
|
.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.
|
|
.LP
|
|
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:
|
|
.LP
|
|
.nr step 1 1
|
|
.IP \n[step]. 3
|
|
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.
|
|
.IP \n+[step].
|
|
Altered source versions must be plainly marked as such, and must not be
|
|
misrepresented as being the original software.
|
|
.IP \n+[step].
|
|
This notice may not be removed or altered from any source distribution.
|
|
.LP
|
|
Jean-loup Gailly Mark Adler
|
|
.br
|
|
jloup@gzip.org madler@alumni.caltech.edu
|
|
.LP
|
|
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
|