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.TH ZLIB 3 "9 July 1998"

.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

.I gzip

(.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

the files

.I example.c

and

.IR minigzip.c .

.LP

A Java implementation of

.IR 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 (pmarquess@bfsec.bt.co.uk)

is available at CPAN (Comprehensive Perl Archive Network) sites,

such as:

.IP

ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*

.LP

A Python interface to

.IR zlib

written by A.M. Kuchling 

is available from the Python Software Association sites, such as:

.IP

ftp://ftp.python.org/pub/python/contrib/Encoding/zlib*.tar.gz

.SH "SEE ALSO"

Questions about zlib should be sent to:

.IP

zlib@quest.jpl.nasa.gov

or, if this fails, to the author addresses given below.

The zlib home page is:

.IP

http://www.cdrom.com/pub/infozip/zlib/

.LP

The data format used by the zlib library is described by RFC

(Request for Comments) 1950 to 1952 in the files:

.IP

ftp://ds.internic.net/rfc/rfc1950.txt (zlib format)

.br

rfc1951.txt (deflate format)

.br

rfc1952.txt (gzip format)

.LP

These documents are also available in other formats from:

.IP

ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html

.SH AUTHORS

Version 1.1.3

Copyright (C) 1995-1998 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