static BROTLI_INLINE uint32_t HashBytesAtOffset(
uint64_t v, int offset, size_t shift) {
BROTLI_DCHECK(offset >= 0);
BROTLI_DCHECK(offset <= 3);
{
const uint64_t h = ((v >> (8 * offset)) << 24) * kHashMul32;
return (uint32_t)(h >> shift);
}
}
void BrotliBuildCodeLengthsHuffmanTable(HuffmanCode* table,
const uint8_t* const code_lengths,
uint16_t* count) {
HuffmanCode code; /* current table entry */
int symbol; /* symbol index in original or sorted table */
uint32_t key; /* prefix code */
uint32_t key_step; /* prefix code addend */
int step; /* step size to replicate values in current table */
int table_size; /* size of current table */
int sorted[BROTLI_CODE_LENGTH_CODES]; /* symbols sorted by code length */
/* offsets in sorted table for each length */
int offset[BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH + 1];
int bits;
int bits_count;
BROTLI_DCHECK(BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH <=
BROTLI_REVERSE_BITS_MAX);
/* generate offsets into sorted symbol table by code length */
symbol = -1;
bits = 1;
BROTLI_REPEAT(BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH, {
symbol += count[bits];
offset[bits] = symbol;
bits++;
});
static BROTLI_INLINE uint32_t HashBytesAtOffset(uint64_t v, size_t offset,
size_t shift, size_t length) {
BROTLI_DCHECK(offset <= 8 - length);
{
const uint64_t h = ((v >> (8 * offset)) << ((8 - length) * 8)) * kHashMul32;
return (uint32_t)(h >> shift);
}
}
void BrotliInitBitReader(BrotliBitReader* const br, BrotliInput input) {
BROTLI_DCHECK(br != NULL);
br->input_ = input;
br->val_ = 0;
br->bit_pos_ = sizeof(br->val_) << 3;
br->avail_in = 0;
br->eos_ = 0;
br->next_in = br->buf_;
}
