media/base/bit_reader.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/base/bit_reader.h"
   6
   7 namespace media {
   8
   9 BitReader::BitReader(const uint8* data, int size)
  10     : initial_size_(size),
  11       data_(data),
  12       bytes_left_(size),
  13       bit_reader_core_(this) {
  14   DCHECK(data != NULL);
  15   DCHECK_GE(size, 0);
  16 }
  17
  18 BitReader::~BitReader() {}
  19
  20 int BitReader::GetBytes(int max_nbytes, const uint8** out) {
  21   DCHECK_GE(max_nbytes, 0);
  22   DCHECK(out);
  23
  24   int nbytes = max_nbytes;
  25   if (nbytes > bytes_left_)
  26     nbytes = bytes_left_;
  27
  28   *out = data_;
  29   data_ += nbytes;
  30   bytes_left_ -= nbytes;
  31   return nbytes;
  32 }
  33
  34 }  // namespace media