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/* Copyright 2016 Google Inc. All Rights Reserved. | ||
Distributed under MIT license. | ||
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT | ||
*/ | ||
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#ifndef BROTLI_COMMON_CONSTANTS_H_ | ||
#define BROTLI_COMMON_CONSTANTS_H_ | ||
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/* Specification: 7.3. Encoding of the context map */ | ||
#define BROTLI_CONTEXT_MAP_MAX_RLE 16 | ||
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/* Specification: 2. Compressed representation overview */ | ||
#define BROTLI_MAX_NUMBER_OF_BLOCK_TYPES 256 | ||
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/* 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) | ||
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/* 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 | ||
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/* Specification: 4. Encoding of distances */ | ||
#define BROTLI_NUM_DISTANCE_SHORT_CODES 16 | ||
#define BROTLI_MAX_NPOSTFIX 3 | ||
#define BROTLI_MAX_NDIRECT 120 | ||
#define BROTLI_MAX_DISTANCE_BITS 24U | ||
/* BROTLI_NUM_DISTANCE_SYMBOLS == 520 */ | ||
#define BROTLI_NUM_DISTANCE_SYMBOLS (BROTLI_NUM_DISTANCE_SHORT_CODES + \ | ||
BROTLI_MAX_NDIRECT + \ | ||
(BROTLI_MAX_DISTANCE_BITS << \ | ||
(BROTLI_MAX_NPOSTFIX + 1))) | ||
/* Distance that is guaranteed to be representable in any stream. */ | ||
#define BROTLI_MAX_DISTANCE 0x3FFFFFC | ||
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/* 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 | ||
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/* 7.2. Context ID for distances */ | ||
#define BROTLI_DISTANCE_CONTEXT_BITS 2 | ||
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/* 9.1. Format of the Stream Header */ | ||
/* Number of slack bytes for window size. Don't confuse | ||
with BROTLI_NUM_DISTANCE_SHORT_CODES. */ | ||
#define BROTLI_WINDOW_GAP 16 | ||
#define BROTLI_MAX_BACKWARD_LIMIT(W) (((size_t)1 << (W)) - BROTLI_WINDOW_GAP) | ||
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#endif /* BROTLI_COMMON_CONSTANTS_H_ */ |
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