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| About site: http://www.zlib.net |
Title: Software/Data Compression - zlib A massively spiffy yet delicately unobtrusive compression library.
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zlib Home Site P { margin-bottom: 0em }  A Massively Spiffy Yet Delicately Unobtrusive Compression Library (Also Free, Not to Mention Unencumbered by Patents) (Not Related to the Linux zlibc Compressing File-I/O Library)Welcome to the zlib home page, web pages originally created by Greg Roelofsand maintained by Mark Adler.If this page seems suspiciously similar to the PNG Home Page, rest assuredthat the similarity is completely coincidental. No, really.zlib was written byJean-loup Gailly (compression) andMark Adler(decompression). Current release: zlib 1.2.3 July 18, 2005Version 1.2.3 eliminates potential security vulnerabilitiesin zlib 1.2.1 and 1.2.2, so all users of those versions should upgrade immediately. The following important fixesare provided in zlib 1.2.3 over 1.2.1 and 1.2.2:Eliminate a potential security vulnerability when decoding invalid compressed dataEliminate a potential security vulnerability when decoding specially crafted compressed dataFix a bug when decompressing dynamic blocks with no distance codesFix crc check bug in gzread() after gzungetc()Do not return an error when using gzread() on an empty fileVersion 1.2.x adds many improvements and features to zlib. Here are some highlights:inflate is about 20% faster and minimizes memory allocationcrc32 is about 50% fasterNew, improved, and supported DLL interface and DLL FAQNew functions and functionality: deflate() and inflate() will now optionally encode and decode gzip streams raw deflate() and inflate() now documented and supported New inflateBack() functions for call-back interface -- faster than inflate() Z_BLOCK flush option and new return information added to inflate to facilitate appending to deflate streams raw deflate() now accepts a dictionary -- for appending deflatePrime() for starting deflate output mid-byte -- for appending Z_RLE strategy for run-length encoding -- option for PNG compression gzclearerr() and gzungetc(), analogous to stdio functions inflateCopy() added, analogous to deflateCopy() deflateBound() and compressBound() for maximum size of compressed data zlibCompileFlags() to provide compilation information More supported architectures and improved shared library supportMany more FAQ entriesSeveral new and updated contributions in the contrib directoryYou can also look at the complete Change Log.Versions 1.1.4 and later eliminate an earlier potential security vulnerability, see details here. Any software that is linkedagainst or derived from an earlier version of zlib should be upgradedimmediately.A partial list of over 500 applications using zlibis given here(uncompressed). Canonical URL: http://zlib.net/ (US) Mirror sites: http://www.gzip.org/zlib/ (France) http://zlib.ipinfo.de/ (Germany) ![[DDJ's zlib image]](http://www.zlib.net/images/zlib_ddj.png) zlib is designed to be a free,general-purpose, legally unencumbered -- that is, not covered by any patents-- lossless data-compression library for use on virtually any computer hardwareand operating system. The zlib data format is itself portable acrossplatforms. Unlike the LZW compression method used in Unix compress(1)and in the GIF image format, the compression method currently used in zlibessentially never expands the data. (LZW can double or triple the file size inextreme cases.) zlib's memory footprint is also independent of the input dataand can be reduced, if necessary, at some cost in compression. A more precise,technical discussion of both points is available on another page.zlib was written byJean-loup Gailly (compression) andMark Adler(decompression). Jean-loup is also the primary author/maintainer of gzip(1), the author of the  zlib Python interface (online manual; part of the standard library as of Python 1.5) zlib Tcl interface mkZiplib zlib Java interface (see also JAR format) zlib reimplementation in pure Java (not tested by us, but looks like a good alternative to java.util.zip) Mark Nelson's JavaZip article (with source code) for Dr. Dobb's Journal (December 1997) Gilles Vollant's zlib-based mini-zip and mini-unzip (see also Info-ZIP's UnZip, which optionally can be compiled with zlib) Scott Ludwig's zlib-based CExe executable compressor for Win32 |
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A | massively | spiffy | yet | delicately | unobtrusive | compression | library. |
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http://www.zlib.net
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