1 // Copyright 2014 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 "chromecast/media/cma/ipc_streamer/decrypt_config_marshaller.h" 6 7 #include "base/logging.h" 8 #include "chromecast/media/cma/ipc/media_message.h" 9 #include "media/base/decrypt_config.h" 10 11 namespace chromecast { 12 namespace media { 13 14 namespace { 15 const size_t kMaxKeyIdSize = 256; 16 const size_t kMaxIvSize = 256; 17 const size_t kMaxSubsampleCount = 1024; 18 } 19 20 // static 21 void DecryptConfigMarshaller::Write( 22 const ::media::DecryptConfig& config, MediaMessage* msg) { 23 CHECK_GT(config.key_id().size(), 0); 24 CHECK_GT(config.iv().size(), 0); 25 CHECK_GT(config.subsamples().size(), 0); 26 27 CHECK(msg->WritePod(config.key_id().size())); 28 CHECK(msg->WriteBuffer(config.key_id().data(), config.key_id().size())); 29 CHECK(msg->WritePod(config.iv().size())); 30 CHECK(msg->WriteBuffer(config.iv().data(), config.iv().size())); 31 CHECK(msg->WritePod(config.subsamples().size())); 32 for (size_t k = 0; k < config.subsamples().size(); k++) { 33 CHECK(msg->WritePod(config.subsamples()[k].clear_bytes)); 34 CHECK(msg->WritePod(config.subsamples()[k].cypher_bytes)); 35 } 36 } 37 38 // static 39 scoped_ptr< ::media::DecryptConfig> DecryptConfigMarshaller::Read( 40 MediaMessage* msg) { 41 size_t key_id_size = 0; 42 CHECK(msg->ReadPod(&key_id_size)); 43 CHECK_GT(key_id_size, 0); 44 CHECK_LT(key_id_size, kMaxKeyIdSize); 45 scoped_ptr<char[]> key_id(new char[key_id_size]); 46 CHECK(msg->ReadBuffer(key_id.get(), key_id_size)); 47 48 size_t iv_size = 0; 49 CHECK(msg->ReadPod(&iv_size)); 50 CHECK_GT(iv_size, 0); 51 CHECK_LT(iv_size, kMaxIvSize); 52 scoped_ptr<char[]> iv(new char[iv_size]); 53 CHECK(msg->ReadBuffer(iv.get(), iv_size)); 54 55 size_t subsample_count = 0; 56 CHECK(msg->ReadPod(&subsample_count)); 57 CHECK_GT(subsample_count, 0); 58 CHECK_LT(subsample_count, kMaxSubsampleCount); 59 std::vector< ::media::SubsampleEntry> subsamples(subsample_count); 60 for (size_t k = 0; k < subsample_count; k++) { 61 subsamples[k].clear_bytes = 0; 62 subsamples[k].cypher_bytes = 0; 63 CHECK(msg->ReadPod(&subsamples[k].clear_bytes)); 64 CHECK(msg->ReadPod(&subsamples[k].cypher_bytes)); 65 } 66 67 return scoped_ptr< ::media::DecryptConfig>( 68 new ::media::DecryptConfig( 69 std::string(key_id.get(), key_id_size), 70 std::string(iv.get(), iv_size), 71 subsamples)); 72 } 73 74 } // namespace media 75 } // namespace chromecast 76
