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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:

   * Format change: don't push distances representing static dictionary words to the distance cache.
   * Fix decoder invalid memory access bug caused by building a non-complete Huffman tree.
   * Add a mode parameter to the encoder interface.
   * Use different hashers for text and font mode.
   * Add a heuristics to the hasher for skipping non-compressible data.
   * Exhaustive search of static dictionary during backward reference search.
This commit is contained in:
Zoltan Szabadka
2014-03-20 14:32:35 +01:00
parent 7f848593bd
commit 278b89484f
14 changed files with 546 additions and 280 deletions
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brotli/brotlispec.txt
+3 -1
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@@ -589,7 +589,9 @@ Abstract
in the sequence of distances) is not pushed to the ring-buffer of
last distances, in other words, the expression "(second, third,
fourth) last distance" means the (second, third, fourth) last
distance that was not represented by a 0 distance code.
distance that was not represented by a 0 distance code. Similarly,
distances that represent static dictionary words (see Section 8.) are
not pushed to the ringbuffer of last distances.
The next NDIRECT distance codes, from 16 to 15 + NDIRECT, represent
distances from 1 to NDIRECT. Neither the distance short codes, nor