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Project Description

zlib is designed to be a free, general-purpose, legally unencumbered, lossless data-compression library for use on virtually any computer hardware and operating system. The zlib data format is itself portable across platforms. Unlike the LZW compression method used in Unix compress(1), the compression method currently used in zlib essentially never expands the data. (LZW can double or triple the file size in extreme cases.) zlib's memory footprint is also independent of the input data and can be reduced, if necessary, at some cost in compression.

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2012-02-01 07:23
1.2.6

Many minor bugfixes and enhancements were made.
Tags: Minor bugfixes, Minor feature enhancements

2010-07-08 22:32
1.2.5

Bugs were fixed in adler32_combine(), compressBound(), and deflateBound(). The gz functions were replaced with faster versions and gzbuffer(), gzoffset(), gzclose_r(), and gzclose_w() functions were added. Faster Z_HUFFMAN_ONLY and Z_RLE compression was introduced for images and other specialized compression. A Z_BLOCK flush option was added to deflate() along with a Z_TREES flush option for inflate(). inflateReset2() and inflateMark() functions were added, the latter to aid in random access applications. Many portability improvements were made. Examples and contribs were updated.
Tags: Major feature enhancements, Minor bugfixes

2005-10-14 10:28
1.2.3

A potential security vulnerability when decoding
invalid compressed data was eliminated. A
potential security vulnerability when decoding
specially crafted compressed data was eliminated.
A bug when decompressing dynamic blocks with no
distance codes was fixed. A CRC check bug in
gzread() after gzungetc() was fixed. An error is
no longer returned when using gzread() on an empty
file.
Tags: Major security fixes

2005-07-12 01:37
1.2.2

This release eliminates a potential security vulnerability in 1.2.1, so all users of 1.2.1 should upgrade immediately. It eliminates a potential security vulnerability when decoding invalid compressed data, fixes a bug when decompressing dynamic blocks with no distance codes, and does not return an error when using gzread() on an empty file.
Tags: Major security fixes

2003-12-02 16:40
1.2.1

This release adds many improvements and features
to zlib.
Tags: Major feature enhancements

Project Resources

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