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brotli/dec/context.h

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Use C-style comments in the brotli decoder.
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/* Copyright 2013 Google Inc. All Rights Reserved.
Fix headers
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Distributed under MIT license.
Update license statement in source files.
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See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
separate the licenses from documentation
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*/
Use C-style comments in the brotli decoder.
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separate the licenses from documentation
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/* Lookup table to map the previous two bytes to a context id.
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There are four different context modeling modes defined here:
CONTEXT_LSB6: context id is the least significant 6 bits of the last byte,
CONTEXT_MSB6: context id is the most significant 6 bits of the last byte,
CONTEXT_UTF8: second-order context model tuned for UTF8-encoded text,
CONTEXT_SIGNED: second-order context model tuned for signed integers.
The context id for the UTF8 context model is calculated as follows. If p1
Fix typos.
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and p2 are the previous two bytes, we calculate the context as
Use C-style comments in the brotli decoder.
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context = kContextLookup[p1] | kContextLookup[p2 + 256].
If the previous two bytes are ASCII characters (i.e. < 128), this will be
equivalent to
context = 4 * context1(p1) + context2(p2),
where context1 is based on the previous byte in the following way:
0 : non-ASCII control
1 : \t, \n, \r
2 : space
3 : other punctuation
4 : " '
5 : %
6 : ( < [ {
7 : ) > ] }
8 : , ; :
9 : .
10 : =
11 : number
12 : upper-case vowel
13 : upper-case consonant
14 : lower-case vowel
15 : lower-case consonant
and context2 is based on the second last byte:
0 : control, space
1 : punctuation
2 : upper-case letter, number
3 : lower-case letter
If the last byte is ASCII, and the second last byte is not (in a valid UTF8
stream it will be a continuation byte, value between 128 and 191), the
context is the same as if the second last byte was an ASCII control or space.
If the last byte is a UTF8 lead byte (value >= 192), then the next byte will
be a continuation byte and the context id is 2 or 3 depending on the LSB of
the last byte and to a lesser extent on the second last byte if it is ASCII.
If the last byte is a UTF8 continuation byte, the second last byte can be:
- continuation byte: the next byte is probably ASCII or lead byte (assuming
4-byte UTF8 characters are rare) and the context id is 0 or 1.
- lead byte (192 - 207): next byte is ASCII or lead byte, context is 0 or 1
- lead byte (208 - 255): next byte is continuation byte, context is 2 or 3
The possible value combinations of the previous two bytes, the range of
context ids and the type of the next byte is summarized in the table below:
|--------\-----------------------------------------------------------------|
| \ Last byte |
| Second \---------------------------------------------------------------|
| last byte \ ASCII | cont. byte | lead byte |
| \ (0-127) | (128-191) | (192-) |
|=============|===================|=====================|==================|
| ASCII | next: ASCII/lead | not valid | next: cont. |
| (0-127) | context: 4 - 63 | | context: 2 - 3 |
|-------------|-------------------|---------------------|------------------|
| cont. byte | next: ASCII/lead | next: ASCII/lead | next: cont. |
| (128-191) | context: 4 - 63 | context: 0 - 1 | context: 2 - 3 |
|-------------|-------------------|---------------------|------------------|
| lead byte | not valid | next: ASCII/lead | not valid |
| (192-207) | | context: 0 - 1 | |
|-------------|-------------------|---------------------|------------------|
| lead byte | not valid | next: cont. | not valid |
| (208-) | | context: 2 - 3 | |
|-------------|-------------------|---------------------|------------------|
The context id for the signed context mode is calculated as:
context = (kContextLookup[512 + p1] << 3) | kContextLookup[512 + p2].
For any context modeling modes, the context ids can be calculated by |-ing
together two lookups from one table using context model dependent offsets:
context = kContextLookup[offset1 + p1] | kContextLookup[offset2 + p2].
where offset1 and offset2 are dependent on the context mode.
*/
Add brotli decompressor This commit is for the decoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
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#ifndef BROTLI_DEC_CONTEXT_H_
#define BROTLI_DEC_CONTEXT_H_
Move "public" to "include/brotli"
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#include <brotli/types.h>
Add brotli decompressor This commit is for the decoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
2013-10-11 08:26:07 +00:00
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.
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enum ContextType {
Update decoder: * More clear/safe "copy" command stage implementation * Enable unaligned memory access only on whitelisted CPUs * Remove unused streams.{c|h} * Add "default" to all switches * Fix includes * Fix spacing everywhere
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CONTEXT_LSB6 = 0,
CONTEXT_MSB6 = 1,
CONTEXT_UTF8 = 2,
CONTEXT_SIGNED = 3
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.
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};
Use C-style comments in the brotli decoder.
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/* Common context lookup table for all context modes. */
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.
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static const uint8_t kContextLookup[1792] = {
Use C-style comments in the brotli decoder.
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/* CONTEXT_UTF8, last byte. */
/* ASCII range. */
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.
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0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 0, 4, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
8, 12, 16, 12, 12, 20, 12, 16, 24, 28, 12, 12, 32, 12, 36, 12,
44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 32, 32, 24, 40, 28, 12,
12, 48, 52, 52, 52, 48, 52, 52, 52, 48, 52, 52, 52, 52, 52, 48,
52, 52, 52, 52, 52, 48, 52, 52, 52, 52, 52, 24, 12, 28, 12, 12,
12, 56, 60, 60, 60, 56, 60, 60, 60, 56, 60, 60, 60, 60, 60, 56,
60, 60, 60, 60, 60, 56, 60, 60, 60, 60, 60, 24, 12, 28, 12, 0,
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/* UTF8 continuation byte range. */
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.
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0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1,
Use C-style comments in the brotli decoder.
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/* UTF8 lead byte range. */
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.
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2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3,
Use C-style comments in the brotli decoder.
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/* CONTEXT_UTF8 second last byte. */
/* ASCII range. */
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.
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Add brotli decompressor This commit is for the decoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
2013-10-11 08:26:07 +00:00
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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.
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2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1,
1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1,
1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 0,
Use C-style comments in the brotli decoder.
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/* UTF8 continuation byte range. */
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.
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Use C-style comments in the brotli decoder.
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/* UTF8 lead byte range. */
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 18:02:17 +00:00
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Add brotli decompressor This commit is for the decoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
2013-10-11 08:26:07 +00:00
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
Use C-style comments in the brotli decoder.
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/* CONTEXT_SIGNED, second last byte. */
Add brotli decompressor This commit is for the decoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
2013-10-11 08:26:07 +00:00
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7,
Use C-style comments in the brotli decoder.
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/* CONTEXT_SIGNED, last byte, same as the above values shifted by 3 bits. */
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.
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0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32,
40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40,
48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 56,
Use C-style comments in the brotli decoder.
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/* CONTEXT_LSB6, last byte. */
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.
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
Use C-style comments in the brotli decoder.
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/* CONTEXT_MSB6, last byte. */
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.
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0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,
4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,
8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11,
12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15,
16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19,
20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23,
24, 24, 24, 24, 25, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27,
28, 28, 28, 28, 29, 29, 29, 29, 30, 30, 30, 30, 31, 31, 31, 31,
32, 32, 32, 32, 33, 33, 33, 33, 34, 34, 34, 34, 35, 35, 35, 35,
36, 36, 36, 36, 37, 37, 37, 37, 38, 38, 38, 38, 39, 39, 39, 39,
40, 40, 40, 40, 41, 41, 41, 41, 42, 42, 42, 42, 43, 43, 43, 43,
44, 44, 44, 44, 45, 45, 45, 45, 46, 46, 46, 46, 47, 47, 47, 47,
48, 48, 48, 48, 49, 49, 49, 49, 50, 50, 50, 50, 51, 51, 51, 51,
52, 52, 52, 52, 53, 53, 53, 53, 54, 54, 54, 54, 55, 55, 55, 55,
56, 56, 56, 56, 57, 57, 57, 57, 58, 58, 58, 58, 59, 59, 59, 59,
60, 60, 60, 60, 61, 61, 61, 61, 62, 62, 62, 62, 63, 63, 63, 63,
Use C-style comments in the brotli decoder.
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/* CONTEXT_{M,L}SB6, second last byte, */
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.
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
Add brotli decompressor This commit is for the decoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
2013-10-11 08:26:07 +00:00
};
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.
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static const int kContextLookupOffsets[8] = {
Use C-style comments in the brotli decoder.
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/* CONTEXT_LSB6 */
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 18:02:17 +00:00
1024, 1536,
Use C-style comments in the brotli decoder.
2013-12-16 13:45:57 +00:00
/* CONTEXT_MSB6 */
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 18:02:17 +00:00
1280, 1536,
Use C-style comments in the brotli decoder.
2013-12-16 13:45:57 +00:00
/* CONTEXT_UTF8 */
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 18:02:17 +00:00
0, 256,
Use C-style comments in the brotli decoder.
2013-12-16 13:45:57 +00:00
/* CONTEXT_SIGNED */
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 18:02:17 +00:00
768, 512,
Add brotli decompressor This commit is for the decoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
2013-10-11 08:26:07 +00:00
};
Use C-style comments in the brotli decoder.
2013-12-16 13:45:57 +00:00
#endif /* BROTLI_DEC_CONTEXT_H_ */
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