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Updates to Brotli compression format, decoder and encoder

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This commit contains a batch of changes that were made to the Brotli
compression algorithm in the last month. Most important changes:

   * Updated spec
   * Changed Huffman code length alphabet to use run length codes more
     efficiently, based on a suggestion by Robert Obryk
   * Changed encoding of the number of Huffman code lengths (HLEN)
   * Changed encoding of the number of Huffman trees (NTREES)
   * Added support for uncompressed meta-blocks
This commit is contained in:
Zoltan Szabadka
2013-12-12 13:18:04 +01:00
parent fe79fac8da
commit e70949119a
11 changed files with 411 additions and 263 deletions
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brotli/enc/block_splitter.cc
+2 -3
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@@ -282,9 +282,8 @@ void ClusterBlocks(const DataType* data, const size_t length,
}
std::vector<HistogramType> clustered_histograms;
std::vector<int> histogram_symbols;
// Block ids need to fit in one byte and there are two ids reserved for
// indicating 'same as last' and 'last plus one'.
static const int kMaxNumberOfBlockTypes = 254;
// Block ids need to fit in one byte.
static const int kMaxNumberOfBlockTypes = 256;
ClusterHistograms(histograms, 1, histograms.size(),
kMaxNumberOfBlockTypes,
&clustered_histograms,