Support HLS MPEG2 TS with SAMPLE-AES encryption.

media/base/bit_reader.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/bit_reader.h"
 
 namespace media {
 
 BitReader::BitReader(const uint8_t* data, int size)
     : initial_size_(size),
       data_(data),
       bytes_left_(size),
       bit_reader_core_(this) {
   DCHECK(data != NULL);
   DCHECK_GE(size, 0);
 }
 
 BitReader::~BitReader() {}
 
+bool BitReader::ReadString(int num_bits, std::string* str) {
+  int num_bytes = num_bits / 8;
+  DCHECK_EQ(num_bits % 8, 0);
+  DCHECK(str);
+  str->resize(num_bytes);
+  char* ptr = &str->front();
+  while (num_bytes--)
+    if (!ReadBits(8, ptr++))
+      return false;
+  return true;
+}
+
 int BitReader::GetBytes(int max_nbytes, const uint8_t** out) {
   DCHECK_GE(max_nbytes, 0);
   DCHECK(out);
 
   int nbytes = max_nbytes;
   if (nbytes > bytes_left_)
     nbytes = bytes_left_;
 
   *out = data_;
   data_ += nbytes;
   bytes_left_ -= nbytes;
   return nbytes;
 }
 
 }  // namespace media