/* *  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 <limits.h>#include <stdlib.h> #include "./vpx_config.h"#include "./bitwriter_buffer.h" size_t vpx_wb_bytes_written(const struct vpx_write_bit_buffer *wb) {  return wb->bit_offset / CHAR_BIT + (wb->bit_offset % CHAR_BIT > 0);} void vpx_wb_write_bit(struct vpx_write_bit_buffer *wb, int bit) {  const int off = (int)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;} void vpx_wb_write_literal(struct vpx_write_bit_buffer *wb, int data, int bits) {  int bit;  for (bit = bits - 1; bit >= 0; bit--) vpx_wb_write_bit(wb, (data >> bit) & 1);} void vpx_wb_write_inv_signed_literal(struct vpx_write_bit_buffer *wb, int data,                                     int bits) {  vpx_wb_write_literal(wb, abs(data), bits);  vpx_wb_write_bit(wb, data < 0);}