1 // Copyright 2016 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 #ifndef MOJO_EDK_SYSTEM_BROKER_MESSAGES_H_ 6 #define MOJO_EDK_SYSTEM_BROKER_MESSAGES_H_ 7 8 #include "mojo/edk/system/channel.h" 9 10 namespace mojo { 11 namespace edk { 12 13 #pragma pack(push, 1) 14 15 enum BrokerMessageType : uint32_t { 16 INIT, 17 BUFFER_REQUEST, 18 BUFFER_RESPONSE, 19 }; 20 21 struct BrokerMessageHeader { 22 BrokerMessageType type; 23 uint32_t padding; 24 }; 25 26 static_assert(IsAlignedForChannelMessage(sizeof(BrokerMessageHeader)), 27 "Invalid header size."); 28 29 struct BufferRequestData { 30 uint32_t size; 31 }; 32 33 #if defined(OS_WIN) 34 struct InitData { 35 // NOTE: InitData in the payload is followed by string16 data with exactly 36 // |pipe_name_length| wide characters (i.e., |pipe_name_length|*2 bytes.) 37 // This applies to Windows only. 38 uint32_t pipe_name_length; 39 }; 40 #endif 41 42 #pragma pack(pop) 43 44 template <typename T> 45 inline Channel::MessagePtr CreateBrokerMessage( 46 BrokerMessageType type, 47 size_t num_handles, 48 size_t extra_data_size, 49 T** out_message_data, 50 void** out_extra_data = nullptr) { 51 const size_t message_size = sizeof(BrokerMessageHeader) + 52 sizeof(**out_message_data) + extra_data_size; 53 Channel::MessagePtr message(new Channel::Message(message_size, num_handles)); 54 BrokerMessageHeader* header = 55 reinterpret_cast<BrokerMessageHeader*>(message->mutable_payload()); 56 header->type = type; 57 header->padding = 0; 58 *out_message_data = reinterpret_cast<T*>(header + 1); 59 if (out_extra_data) 60 *out_extra_data = *out_message_data + 1; 61 return message; 62 } 63 64 inline Channel::MessagePtr CreateBrokerMessage( 65 BrokerMessageType type, 66 size_t num_handles, 67 std::nullptr_t** dummy_out_data) { 68 Channel::MessagePtr message( 69 new Channel::Message(sizeof(BrokerMessageHeader), num_handles)); 70 BrokerMessageHeader* header = 71 reinterpret_cast<BrokerMessageHeader*>(message->mutable_payload()); 72 header->type = type; 73 header->padding = 0; 74 return message; 75 } 76 77 } // namespace edk 78 } // namespace mojo 79 80 #endif // MOJO_EDK_SYSTEM_BROKER_MESSAGES_H_ 81
