/* *  Copyright (c) 2013 The WebM project authors. All Rights Reserved. * *  Use of this source code is governed by a BSD-style license *  that can be found in the LICENSE file in the root of the source *  tree. An additional intellectual property rights grant can be found *  in the file PATENTS.  All contributing project authors may *  be found in the AUTHORS file in the root of the source tree. */#include "./vpx_config.h"#include "./bitreader_buffer.h" size_t vpx_rb_bytes_read(struct vpx_read_bit_buffer *rb) {  return (rb->bit_offset + 7) >> 3;} int vpx_rb_read_bit(struct vpx_read_bit_buffer *rb) {  const size_t off = rb->bit_offset;  const size_t p = off >> 3;  const int q = 7 - (int)(off & 0x7);  if (rb->bit_buffer + p < rb->bit_buffer_end) {    const int bit = (rb->bit_buffer[p] >> q) & 1;    rb->bit_offset = off + 1;    return bit;  } else {    if (rb->error_handler != NULL) rb->error_handler(rb->error_handler_data);    return 0;  }} int vpx_rb_read_literal(struct vpx_read_bit_buffer *rb, int bits) {  int value = 0, bit;  for (bit = bits - 1; bit >= 0; bit--) value |= vpx_rb_read_bit(rb) << bit;  return value;} int vpx_rb_read_signed_literal(struct vpx_read_bit_buffer *rb, int bits) {  const int value = vpx_rb_read_literal(rb, bits);  return vpx_rb_read_bit(rb) ? -value : value;} int vpx_rb_read_inv_signed_literal(struct vpx_read_bit_buffer *rb, int bits) {  return vpx_rb_read_signed_literal(rb, bits);}