Function ShiftBytes

src/codec/utils/WebpDecoder.cpp:322–332

If not at EOS, reload up to VP8L_LBITS byte-by-byte

// If not at EOS, reload up to VP8L_LBITS byte-by-byte
static void ShiftBytes(VP8LBitReader* const br) {
  while (br->bit_pos_ >= 8 && br->pos_ < br->len_) {
    br->val_ >>= 8;
    br->val_ |= ((vp8l_val_t)br->buf_[br->pos_]) << (VP8L_LBITS - 8);
    ++br->pos_;
    br->bit_pos_ -= 8;
  }
  if (VP8LIsEndOfStream(br)) {
    VP8LSetEndOfStream(br);
  }
}

uint32_t VP8LReadBits(VP8LBitReader* const br, int n_bits) {
  assert(n_bits >= 0);