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      1 // Copyright 2013 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/cdm/key_system_names.h"
      6 
      7 #include <string>
      8 
      9 namespace media {
     10 
     11 const char kClearKey[] = "org.w3.clearkey";
     12 const char kExternalClearKey[] = "org.chromium.externalclearkey";
     13 
     14 static bool IsParentKeySystemOf(const std::string& parent_key_system,
     15                                 const std::string& key_system) {
     16   std::string prefix = parent_key_system + '.';
     17   return key_system.substr(0, prefix.size()) == prefix;
     18 }
     19 
     20 bool IsExternalClearKey(const std::string& key_system) {
     21   return key_system == kExternalClearKey ||
     22          IsParentKeySystemOf(kExternalClearKey, key_system);
     23 }
     24 
     25 }  // namespace media
     26