Zlib source code, version 1.2.11, tar.gz format (593K, The current release is publicly available here: The lovely zlib-vise image above was provided courtesy of Bruce Gardner, artĪppears in Mark Nelson's article in the January 1997 issue (see below). Raw class and as a component of the JAR archive The deflate and zlib specifications both achieved official Internet RFC status in May 1996,Īnd zlib itself was adopted in version 1.1 of the Java Development Kit (JDK), both as a We are getting too many questions which already have an Mark and Jean-loup can be reached by e-mail at Gzip and Zip, namely, the `deflate' method that originated in The compression algorithm used in zlib is essentially the same as that in Gzip(1), the author of the pression FAQ list andĭecompression routines and was the original author of Zip. Technical discussion of both points is available on (LZW can double or triple the file size inĮxtreme cases.) zlib's memory footprint is also independent of the input dataĪnd can be reduced, if necessary, at some cost in compression. Unlike the LZW compression method used in Unix compress(1)Īnd in the GIF image format, the compression method currently used in zlibĮssentially never expands the data. The zlib data format is itself portable across lossless data-compression library for use on virtually any computer hardwareĪnd operating system. General-purpose, legally unencumbered - that is, not covered by any patents You can also look at the complete Change Log. Add crc32_z() and adler32_z() functions with size_t lengths.Dramatically speed up deflation for level 0 (storing)ĭuplicating the interfaces of fread() and fwrite().Add uncompress2() function, which returns the input size used.Fix bugs in creating a very large gzip header.Fix bug when level 0 used with Z_HUFFMAN or Z_RLE.

Allow building zlib outside of the source directory.Improve compress() and uncompress() to support large lengths.Version 1.2.9 has these key improvements over 1.2.8: Fix bug in gzwrite.c that produced corrupt gzip files.Fix bug in deflate_stored() for zero-length input.Version 1.2.10 has these key improvements over 1.2.9: Permit immediate deflateParams changes before any deflate inputĭue to the bug fixes, any installations of 1.2.9 or 1.2.10 should be immediately replaced with 1.2.11.Fix deflate stored bug when pulling last block from window.Version 1.2.11 has these key improvements over 1.2.10: That the similarity is completely coincidental. If this page seems suspiciously similar to the Welcome to the zlib home page, web pages originally created by ( Not Related to the Linux zlibc Compressing File-I/O Library) (Also Free, Not to Mention Unencumbered by Patents) A Massively Spiffy Yet Delicately Unobtrusive Compression Library

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