Commit Graph

8 Commits

Author SHA1 Message Date
Zoltan Szabadka
4278934e82 Fix undefined behavior in decoder.
Use memmove() for copying overlapping buffers.
2014-11-26 10:37:33 +01:00
Zoltan Szabadka
0454ab4ec0 Updates to Brotli compression format, decoder and encoder
This commit contains a batch of changes that were made to the Brotli
compression algorithm in the last month. Most important changes:

   * Fixes to the spec.
   * Change of code length code order.
   * Use a 2-level Huffman lookup table in the decoder.
   * Faster uncompressed meta-block decoding.
   * Optimized encoding of the Huffman code.
   * Detection of UTF-8 input encoding.
   * UTF-8 based literal cost modeling for improved
     backward reference selection.
2014-02-14 15:04:23 +01:00
Zoltan Szabadka
d01c71c4ad Fix -Wconversion compiler warnings in the brotli decoder. 2014-01-08 12:34:35 +01:00
Zoltan Szabadka
b8a1008569 Use C-style comments in the brotli decoder. 2013-12-16 14:45:57 +01:00
Zoltan Szabadka
354349d7ae Fix Microsoft VisualStudio build of brotli
- Move all variable declarations to the beginning of the block
- #ifdef-out read/write calls
2013-12-13 10:39:46 +01:00
Zoltan Szabadka
60c24c0c2d Updates to Brotli compression format, decoder and encoder
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
2013-12-12 13:18:04 +01:00
Zoltan Szabadka
c6b9c7c5c8 Updates to Brotli compression format, decoder and encoder
This commit contains a batch of changes that were made to the Brotli
compression algorithm in the last three weeks. Most important changes:

  * Added UTF8 context model for good text compression.
  * Simplified context modeling by having only 4 context modes.
  * Per-block context mode selection.
  * Faster backward copying and bit reading functions.
  * More efficient histogram coding.
  * Streaming support for the decoder and encoder.
2013-11-15 19:02:17 +01:00
Zoltan Szabadka
8f30907d0f Add brotli decompressor
This commit is for the decoder for brotli compression format.
Brotli is a generic byte-level compression algorithm.
2013-10-11 10:26:07 +02:00