New versions of zlib are announced on this list. Zlib Information zlib Frequently Asked Questions Has been tested extensively as part of many Zlib source code, version 1.2.13, zipfile format (1594K, Zlib source code, version 1.2.13, tar.xz format (1266K, Zlib source code, version 1.2.13, tar.gz format (1462K, 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 Zlib development contributions and issues are best addressed on Nearly all of the questions we get already have anĪnswer in the zlib documentation. 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_combine_gen() and crc32_combine_op() for fast combines. Speed up crc32_combine() with powers of x tables.Use the hardware CRC-32 instruction on ARMv8 processors.Speed up CRC-32 computations by a factor of 1.5 to 3.Fix a deflate bug when the window is full in deflate_stored().Fix a deflate bug when using the Z_FIXED strategy that can result in out-of-bound accesses.Version 1.2.12 has these key improvements over 1.2.11:
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