kc3-lang/brotli/common/constants.h

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• Hash : f1c9ab29
  Author :
  Date : 2016-06-03T10:51:04
  

  Extract common parts: constants, dictionary, etc.
  

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• common/constants.h

• /* Copyright 2016 Google Inc. All Rights Reserved.
  
     Distributed under MIT license.
     See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
  */
  
  #ifndef BROTLI_COMMON_CONSTANTS_H_
  #define BROTLI_COMMON_CONSTANTS_H_
  
  /* Specification: 7.3. Encoding of the context map */
  #define BROTLI_CONTEXT_MAP_MAX_RLE 16
  
  /* Specification: 2. Compressed representation overview */
  #define BROTLI_MAX_NUMBER_OF_BLOCK_TYPES 256
  
  /* Specification: 3.3. Alphabet sizes: insert-and-copy length */
  #define BROTLI_NUM_LITERAL_SYMBOLS 256
  #define BROTLI_NUM_COMMAND_SYMBOLS 704
  #define BROTLI_NUM_BLOCK_LEN_SYMBOLS 26
  #define BROTLI_MAX_CONTEXT_MAP_SYMBOLS (BROTLI_MAX_NUMBER_OF_BLOCK_TYPES + \
                                          BROTLI_CONTEXT_MAP_MAX_RLE)
  #define BROTLI_MAX_BLOCK_TYPE_SYMBOLS (BROTLI_MAX_NUMBER_OF_BLOCK_TYPES + 2)
  
  /* Specification: 3.5. Complex prefix codes */
  #define BROTLI_REPEAT_PREVIOUS_CODE_LENGTH 16
  #define BROTLI_REPEAT_ZERO_CODE_LENGTH 17
  #define BROTLI_CODE_LENGTH_CODES (BROTLI_REPEAT_ZERO_CODE_LENGTH + 1)
  /* "code length of 8 is repeated" */
  #define BROTLI_INITIAL_REPEATED_CODE_LENGTH 8
  
  /* Specification: 4. Encoding of distances */
  #define BROTLI_NUM_DISTANCE_SHORT_CODES 16
  #define BROTLI_MAX_NPOSTFIX 3
  #define BROTLI_MAX_NDIRECT 120
  /* BROTLI_NUM_DISTANCE_SYMBOLS == 520 */
  #define BROTLI_NUM_DISTANCE_SYMBOLS (BROTLI_NUM_DISTANCE_SHORT_CODES + \
                                       BROTLI_MAX_NDIRECT +              \
                                       (24 << (BROTLI_MAX_NPOSTFIX + 1)))
  
  /* 7.1. Context modes and context ID lookup for literals */
  /* "context IDs for literals are in the range of 0..63" */
  #define BROTLI_LITERAL_CONTEXT_BITS 6
  
  /* 7.2. Context ID for distances */
  #define BROTLI_DISTANCE_CONTEXT_BITS 2
  
  #endif  /* BROTLI_COMMON_CONSTANTS_H_ */
  

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