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35e69fc7cf
* New feature: "Large Window Brotli" By setting special encoder/decoder flag it is now possible to extend LZ-window up to 30 bits; though produced stream will not be RFC7932 compliant. Added new dictionary generator - "DSH". It combines speed of "Sieve" and quality of "DM". Plus utilities to prepare train corpora (remove unique strings). Improved compression ratio: now two sub-blocks could be stitched: the last copy command could be extended to span the next sub-block. Fixed compression ineffectiveness caused by floating numbers rounding and wrong cost heuristic. Other C changes: - combined / moved `context.h` to `common` - moved transforms to `common` - unified some aspects of code formatting - added an abstraction for encoder (static) dictionary - moved default allocator/deallocator functions to `common` brotli CLI: - window size is auto-adjusted if not specified explicitly Java: - added "eager" decoding both to JNI wrapper and pure decoder - huge speed-up of `DictionaryData` initialization * Add dictionaryless compressed dictionary * Fix `sources.lst` * Fix `sources.lst` and add a note that `libtool` is also required. * Update setup.py * Fix `EagerStreamTest` * Fix BUILD file * Add missing `libdivsufsort` dependency * Fix "unused parameter" warning.
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* Copyright 2013 Google Inc. All Rights Reserved.
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Distributed under MIT license.
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See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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*/
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/* Models the histograms of literals, commands and distance codes. */
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#ifndef BROTLI_ENC_HISTOGRAM_H_
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#define BROTLI_ENC_HISTOGRAM_H_
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#include <string.h> /* memset */
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#include "../common/constants.h"
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#include "../common/context.h"
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#include "../common/platform.h"
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#include <brotli/types.h>
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#include "./block_splitter.h"
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#include "./command.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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/* The distance symbols effectively used by "Large Window Brotli" (32-bit). */
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#define BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS 544
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#define FN(X) X ## Literal
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#define DATA_SIZE BROTLI_NUM_LITERAL_SYMBOLS
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#define DataType uint8_t
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#include "./histogram_inc.h" /* NOLINT(build/include) */
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#undef DataType
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#undef DATA_SIZE
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#undef FN
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#define FN(X) X ## Command
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#define DataType uint16_t
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#define DATA_SIZE BROTLI_NUM_COMMAND_SYMBOLS
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#include "./histogram_inc.h" /* NOLINT(build/include) */
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#undef DATA_SIZE
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#undef FN
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#define FN(X) X ## Distance
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#define DATA_SIZE BROTLI_NUM_HISTOGRAM_DISTANCE_SYMBOLS
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#include "./histogram_inc.h" /* NOLINT(build/include) */
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#undef DataType
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#undef DATA_SIZE
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#undef FN
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BROTLI_INTERNAL void BrotliBuildHistogramsWithContext(
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const Command* cmds, const size_t num_commands,
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const BlockSplit* literal_split, const BlockSplit* insert_and_copy_split,
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const BlockSplit* dist_split, const uint8_t* ringbuffer, size_t pos,
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size_t mask, uint8_t prev_byte, uint8_t prev_byte2,
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const ContextType* context_modes, HistogramLiteral* literal_histograms,
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HistogramCommand* insert_and_copy_histograms,
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HistogramDistance* copy_dist_histograms);
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#if defined(__cplusplus) || defined(c_plusplus)
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} /* extern "C" */
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#endif
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#endif /* BROTLI_ENC_HISTOGRAM_H_ */
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