ZLIB Coding Functions

This section describes Intel IPP data compression functions that implement compression methods and data formats defined by the following specifications: [RFC1950], [RFC1951], and [RFC1952]. These formats are also known as ZLIB, DEFLATE, and GZIP, respectively.

A basic algorithm for these data compression methods is based on the Lempel-Ziv (LZ77) [Ziv77] dictionary-based compression.

The structure of ZLIB data is schematically shown in Figure "ZLIB Data Structure".

The full version of the zlib library is included with the product at <ipp directory>/interfaces/data-compression/ipp_zlib.

• Special Parameters
  
• Adler32
  Computes the Adler32 checksum for the source data buffer.
• CRC32, CRC32C
  Computes the CRC32 checksum for the source data buffer.
• DeflateLZ77
  Performs LZ77 encoding according to the specified compression level.
• DeflateLZ77Fast
  Performs LZ77 encoding according to the fast algorithm and parameters of a match.
• DeflateLZ77Fastest
  Performs LZ77 encoding according to the fastest algorithm.
• DeflateLZ77FastestGenHeader
  Computes a header of the provided Huffman tables description.
• DeflateLZ77FastestGenHuffTable
  Builds Huffman tables according to statistical data collections.
• DeflateLZ77FastestGetStat
  Performs statistical data collection required to build user's Huffman table.
• DeflateLZ77FastestPrecompHeader
  Performs LZ77 encoding using the fastest algorithm with prebuilding of customer Huffman tables and prediction header.
• DeflateLZ77Slow
  Performs LZ77 encoding according to the slow algorithm and parameters of a match.
• DeflateDictionarySet
  Presets the user's dictionary for LZ77 encoding.
• DeflateUpdate Hash
  Performs LZ77 encoding according to the specified compression level.
• DeflateHuff
  Performs Huffman encoding .
• InflateBuildHuffTable
  Builds the Huffman code table for compressed block in the “deflate” format.
• Inflate
  Decodes data in the “deflate” format.