Look-ahead hash chain matching for data compression
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United States of America Patent
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Sep 19, 2017
Grant Date -
May 4, 2017
app pub date -
Jan 13, 2017
filing date -
Sep 24, 2015
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Abstract
Example data compression methods disclosed herein include determining a first hash chain index corresponding to a first position in an input data buffer based on a first group of bytes accessed from the input data buffer beginning at a first look-ahead offset from the first position. If a first hash chain (indexed by the first hash chain index), does not satisfy a quality condition, a second hash chain index corresponding to the first position in the input data buffer based on a second group of bytes accessed from the input data buffer beginning at a second look-ahead offset from the first position is determined. The input data buffer is searched at respective adjusted buffer positions to find a second string of data bytes matching a first string of data bytes and information related to the second string of data bytes is provided to an encoder to output compressed data.
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