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libobs/util/bitstream.c
51 строка
992 B
Ryan Foster
clang-format: Increase column limit from 80 to 120
05 окт 2024, 01:19
05 окт 2024, 01:19
a1fbf10
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#include "bitstream.h" #include <stdlib.h> #include <string.h> void bitstream_reader_init(struct bitstream_reader *r, uint8_t *data, size_t len) { memset(r, 0, sizeof(struct bitstream_reader)); r->buf = data; r->subPos = 0x80; r->len = len; } uint8_t bitstream_reader_read_bit(struct bitstream_reader *r) { if (r->pos >= r->len) return 0; uint8_t bit = (*(r->buf + r->pos) & r->subPos) == r->subPos ? 1 : 0; r->subPos >>= 0x1; if (r->subPos == 0) { r->subPos = 0x80; r->pos++; } return bit; } uint8_t bitstream_reader_read_bits(struct bitstream_reader *r, int bits) { uint8_t res = 0; for (int i = 1; i <= bits; i++) { res <<= 1; res |= bitstream_reader_read_bit(r); } return res; } uint8_t bitstream_reader_r8(struct bitstream_reader *r) { return bitstream_reader_read_bits(r, 8); } uint16_t bitstream_reader_r16(struct bitstream_reader *r) { uint8_t b = bitstream_reader_read_bits(r, 8); return ((uint16_t)b << 8) | bitstream_reader_read_bits(r, 8); }