/* *  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. */ #ifndef VP9_BIT_WRITE_BUFFER_H_#define VP9_BIT_WRITE_BUFFER_H_ #include <limits.h> #include "vpx/vpx_integer.h" struct vp9_write_bit_buffer {  uint8_t *bit_buffer;  size_t bit_offset;}; static size_t vp9_rb_bytes_written(struct vp9_write_bit_buffer *wb) {  return wb->bit_offset / CHAR_BIT + (wb->bit_offset % CHAR_BIT > 0);} static void vp9_wb_write_bit(struct vp9_write_bit_buffer *wb, int bit) {  const int off = wb->bit_offset;  const int p = off / CHAR_BIT;  const int q = CHAR_BIT - 1 - off % CHAR_BIT;  if (q == CHAR_BIT -1) {    wb->bit_buffer[p] = bit << q;  } else {    wb->bit_buffer[p] &= ~(1 << q);    wb->bit_buffer[p] |= bit << q;  }  wb->bit_offset = off + 1;} static void vp9_wb_write_literal(struct vp9_write_bit_buffer *wb,                              int data, int bits) {  int bit;  for (bit = bits - 1; bit >= 0; bit--)    vp9_wb_write_bit(wb, (data >> bit) & 1);}  #endif  // VP9_BIT_WRITE_BUFFER_H_