MAN page from Fedora 23 zlib-devel-1.2.8-9.fc23.x86_64.rpm
Section: C Library Functions (3)
Updated: 28 Apr 2013Index
zlib - compression/decompression library
for full description]
library is a general purpose data compression library.The code is thread safe, assuming that the standard library functionsused 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 laterwith the same stream interface.
Compression can be done in a single step if the buffers are large enoughor 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 ingzip(1)(.gz) formatwith 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 the case of corrupted input.
All functions of the compression library are documented in the filezlib.h.The distribution source includes examples of use of the libraryin the filestest/example.candtest/minigzip.c,as well as other examples in theexamples/directory.
Changes to this version are documented in the fileChangeLogthat accompanies the source.
zlibis available in Java using the java.util.zip package:
A Perl interface tozlib,written by Paul Marquess (pmqsAATTcpan.org),is available at CPAN (Comprehensive Perl Archive Network) sites,including:
A Python interface tozlib,written by A.M. Kuchling (amkAATTmagnet.com),is available in Python 1.5 and later versions:
zlibis built intotcl:
An experimental package to read and write files in .zip format,written on top ofzlibby Gilles Vollant (infoAATTwinimage.com),is available at:
- http://www.winimage.com/zLibDll/minizip.htmland also in thecontrib/minizipdirectory of the mainzlibsource distribution.
web site can be found at:
The data format used by the zlib library is described by RFC(Request for Comments) 1950 to 1952 in the files:
- http://tools.ietf.org/html/rfc1950 (for the zlib header and trailer format)
http://tools.ietf.org/html/rfc1951 (for the deflate compressed data format)
http://tools.ietf.org/html/rfc1952 (for the gzip header and trailer format)
Mark Nelson wrote an article aboutzlibfor the Jan. 1997 issue of Dr. Dobb's Journal;a copy of the article is available at:
Before reporting a problem,please check thezlib
web site to verify that you have the latest version ofzlib
;otherwise,obtain the latest version and see if the problem still exists.Please read thezlib
before asking for help.Send questions and/or comments to zlibAATTgzip.org,or (for the Windows DLL version) to Gilles Vollant (infoAATTwinimage.com).
Version 1.2.8Copyright (C) 1995-2013 Jean-loup Gailly (jloupAATTgzip.org)and Mark Adler (madlerAATTalumni.caltech.edu).
This software is provided "as-is,"without any express or implied warranty.In no event will the authors be held liable for any damagesarising from the use of this software.See the distribution directory with respect to requirementsgoverning redistribution.The deflate format used byzlibwas defined by Phil Katz.The deflate andzlibspecifications were written by L. Peter Deutsch.Thanks to all the people who reported problems and suggested variousimprovements inzlib;who are too numerous to cite here.
UNIX manual page by R. P. C. Rodgers,U.S. National Library of Medicine (rodgersAATTnlm.nih.gov).
- SEE ALSO
- REPORTING PROBLEMS
This document was created byman2html,using the manual pages.