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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:

Fix inflateBack to detect invalid input with distances too far.ĭue to the first bug fix, any installations of 1.2.12 or earlier should be replaced with 1.2.13.

Repair prototypes and exporting of the new CRC functions.

Correct incorrect inputs provided to the CRC functions.

Fix a configure issue that discarded the provided CC definition.

Now the smallest block type is selected, for better compression.

Fix a bug in block type selection when Z_FIXED used.

Fix a bug when getting a gzip header extra field with inflateGetHeader().Version 1.2.13 has these key updates from 1.2.12: 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