mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-28 12:25:19 +01:00
65 lines
2.5 KiB
C
65 lines
2.5 KiB
C
/* 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
|
|
|
|
/* "Large Window Brotli" */
|
|
#define BROTLI_LARGE_MAX_DISTANCE_BITS 62U
|
|
#define BROTLI_LARGE_MIN_WBITS 10
|
|
#define BROTLI_LARGE_MAX_WBITS 30
|
|
|
|
/* 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
|
|
#define BROTLI_DISTANCE_ALPHABET_SIZE(NPOSTFIX, NDIRECT, MAXNBITS) ( \
|
|
BROTLI_NUM_DISTANCE_SHORT_CODES + (NDIRECT) + \
|
|
((MAXNBITS) << ((NPOSTFIX) + 1)))
|
|
/* BROTLI_NUM_DISTANCE_SYMBOLS == 1128 */
|
|
#define BROTLI_NUM_DISTANCE_SYMBOLS \
|
|
BROTLI_DISTANCE_ALPHABET_SIZE( \
|
|
BROTLI_MAX_NDIRECT, BROTLI_MAX_NPOSTFIX, BROTLI_LARGE_MAX_DISTANCE_BITS)
|
|
#define BROTLI_MAX_DISTANCE 0x3FFFFFC
|
|
#define BROTLI_MAX_ALLOWED_DISTANCE 0x7FFFFFFC
|
|
|
|
/* 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
|
|
|
|
/* 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)
|
|
|
|
#endif /* BROTLI_COMMON_CONSTANTS_H_ */
|