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Diffstat (limited to 'deps/node/deps/brotli/c/dec/huffman.h')
-rw-r--r-- | deps/node/deps/brotli/c/dec/huffman.h | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/deps/node/deps/brotli/c/dec/huffman.h b/deps/node/deps/brotli/c/dec/huffman.h deleted file mode 100644 index b9f0716c..00000000 --- a/deps/node/deps/brotli/c/dec/huffman.h +++ /dev/null @@ -1,127 +0,0 @@ -/* Copyright 2013 Google Inc. All Rights Reserved. - - Distributed under MIT license. - See file LICENSE for detail or copy at https://opensource.org/licenses/MIT -*/ - -/* Utilities for building Huffman decoding tables. */ - -#ifndef BROTLI_DEC_HUFFMAN_H_ -#define BROTLI_DEC_HUFFMAN_H_ - -#include "../common/platform.h" -#include <brotli/types.h> - -#if defined(__cplusplus) || defined(c_plusplus) -extern "C" { -#endif - -#define BROTLI_HUFFMAN_MAX_CODE_LENGTH 15 - -/* Maximum possible Huffman table size for an alphabet size of (index * 32), - max code length 15 and root table bits 8. */ -static const uint16_t kMaxHuffmanTableSize[] = { - 256, 402, 436, 468, 500, 534, 566, 598, 630, 662, 694, 726, 758, 790, 822, - 854, 886, 920, 952, 984, 1016, 1048, 1080, 1112, 1144, 1176, 1208, 1240, 1272, - 1304, 1336, 1368, 1400, 1432, 1464, 1496, 1528}; -/* BROTLI_NUM_BLOCK_LEN_SYMBOLS == 26 */ -#define BROTLI_HUFFMAN_MAX_SIZE_26 396 -/* BROTLI_MAX_BLOCK_TYPE_SYMBOLS == 258 */ -#define BROTLI_HUFFMAN_MAX_SIZE_258 632 -/* BROTLI_MAX_CONTEXT_MAP_SYMBOLS == 272 */ -#define BROTLI_HUFFMAN_MAX_SIZE_272 646 - -#define BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH 5 - -#if ((defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_32)) && \ - BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0)) -#define BROTLI_HUFFMAN_CODE_FAST_LOAD -#endif - -#if !defined(BROTLI_HUFFMAN_CODE_FAST_LOAD) -/* Do not create this struct directly - use the ConstructHuffmanCode - * constructor below! */ -typedef struct { - uint8_t bits; /* number of bits used for this symbol */ - uint16_t value; /* symbol value or table offset */ -} HuffmanCode; - -static BROTLI_INLINE HuffmanCode ConstructHuffmanCode(const uint8_t bits, - const uint16_t value) { - HuffmanCode h; - h.bits = bits; - h.value = value; - return h; -} - -/* Please use the following macros to optimize HuffmanCode accesses in hot - * paths. - * - * For example, assuming |table| contains a HuffmanCode pointer: - * - * BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(table); - * BROTLI_HC_ADJUST_TABLE_INDEX(table, index_into_table); - * *bits = BROTLI_HC_GET_BITS(table); - * *value = BROTLI_HC_GET_VALUE(table); - * BROTLI_HC_ADJUST_TABLE_INDEX(table, offset); - * *bits2 = BROTLI_HC_GET_BITS(table); - * *value2 = BROTLI_HC_GET_VALUE(table); - * - */ - -#define BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(H) -#define BROTLI_HC_ADJUST_TABLE_INDEX(H, V) H += (V) - -/* These must be given a HuffmanCode pointer! */ -#define BROTLI_HC_FAST_LOAD_BITS(H) (H->bits) -#define BROTLI_HC_FAST_LOAD_VALUE(H) (H->value) - -#else /* BROTLI_HUFFMAN_CODE_FAST_LOAD */ - -typedef BROTLI_ALIGNED(4) uint32_t HuffmanCode; - -static BROTLI_INLINE HuffmanCode ConstructHuffmanCode(const uint8_t bits, - const uint16_t value) { - return ((value & 0xFFFF) << 16) | (bits & 0xFF); -} - -#define BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(H) uint32_t __fastload_##H = (*H) -#define BROTLI_HC_ADJUST_TABLE_INDEX(H, V) H += (V); __fastload_##H = (*H) - -/* These must be given a HuffmanCode pointer! */ -#define BROTLI_HC_FAST_LOAD_BITS(H) ((__fastload_##H) & 0xFF) -#define BROTLI_HC_FAST_LOAD_VALUE(H) ((__fastload_##H) >> 16) -#endif /* BROTLI_HUFFMAN_CODE_FAST_LOAD */ - -/* Builds Huffman lookup table assuming code lengths are in symbol order. */ -BROTLI_INTERNAL void BrotliBuildCodeLengthsHuffmanTable(HuffmanCode* root_table, - const uint8_t* const code_lengths, uint16_t* count); - -/* Builds Huffman lookup table assuming code lengths are in symbol order. - Returns size of resulting table. */ -BROTLI_INTERNAL uint32_t BrotliBuildHuffmanTable(HuffmanCode* root_table, - int root_bits, const uint16_t* const symbol_lists, uint16_t* count_arg); - -/* Builds a simple Huffman table. The |num_symbols| parameter is to be - interpreted as follows: 0 means 1 symbol, 1 means 2 symbols, - 2 means 3 symbols, 3 means 4 symbols with lengths [2, 2, 2, 2], - 4 means 4 symbols with lengths [1, 2, 3, 3]. */ -BROTLI_INTERNAL uint32_t BrotliBuildSimpleHuffmanTable(HuffmanCode* table, - int root_bits, uint16_t* symbols, uint32_t num_symbols); - -/* Contains a collection of Huffman trees with the same alphabet size. */ -/* max_symbol is needed due to simple codes since log2(alphabet_size) could be - greater than log2(max_symbol). */ -typedef struct { - HuffmanCode** htrees; - HuffmanCode* codes; - uint16_t alphabet_size; - uint16_t max_symbol; - uint16_t num_htrees; -} HuffmanTreeGroup; - -#if defined(__cplusplus) || defined(c_plusplus) -} /* extern "C" */ -#endif - -#endif /* BROTLI_DEC_HUFFMAN_H_ */ |