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ZLIB
!!!ZLIB
NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
AUTHORS
----
!!NAME


zlib - compression/decompression library
!!SYNOPSIS


[[see ''zlib.h'' for full description]
!!DESCRIPTION


The ''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.


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.


The library also supports reading and writing files in
''gzip'' (.gz) format with an interface similar to that
of stdio.


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.


All functions of the compression library are documented in
the file ''zlib.h.'' The distribution source includes
examples of use of the library the files ''example.c''
and ''minigzip.c''.


A Java implementation of ''zlib'' is available in the
Java Development Kit 1.1


http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html


A Perl interface to ''zlib'', written by Paul Marquess
(pmarquess@bfsec.bt.co.uk) is available at CPAN
(Comprehensive Perl Archive Network) sites, such
as:


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


A Python interface to ''zlib'' written by A.M. Kuchling
''


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


Questions about zlib should be sent to:


zlib@quest.jpl.nasa.gov or, if this fails, to the author
addresses given below. The zlib home page is:


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


The data format used by the zlib library is described by RFC
(Request for Comments) 1950 to 1952 in the
files:


ftp://ds.internic.net/rfc/rfc1950.txt (zlib format)
rfc1951.txt (deflate format)
rfc1952.txt (gzip format)


These documents are also available in other formats
from:


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


Version 1.1.4 Copyright (C) 1995-2002 Jean-loup Gailly
(jloup@gzip.org) and Mark Adler
(madler@alumni.caltech.edu).


This software is provided
zlib'' was defined by Phil Katz. The deflate
and ''zlib'' specifications were written by L. Peter
Deutsch. Thanks to all the people who reported problems and
suggested various improvements in ''zlib''; who are too
numerous to cite here.


UNIX manual page by R. P. C. Rodgers, U.S. National Library
of Medicine (rodgers@nlm.nih.gov).
----

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Last edited on Monday, June 3, 2002 6:54:38 pm by "perry"

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