/* 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_ */ |