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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 "mojo/public/libs/message/message_builder.h" |
| 6 |
| 7 #include <stdlib.h> |
| 8 #include <string.h> |
| 9 |
| 10 #include <limits> |
| 11 |
| 12 #include "base/logging.h" |
| 13 #include "mojo/public/libs/message/message.h" |
| 14 |
| 15 namespace mojo { |
| 16 namespace { |
| 17 |
| 18 const size_t kAlignment = 8U; |
| 19 const size_t kMessageHeaderSize = 8U; |
| 20 |
| 21 } // namespace |
| 22 |
| 23 MessageBuilder::MessageBuilder() { |
| 24 } |
| 25 |
| 26 MessageBuilder::~MessageBuilder() { |
| 27 } |
| 28 |
| 29 bool MessageBuilder::Initialize(uint32_t message_name) { |
| 30 uint32_t message_header[2] = { |
| 31 0, // Length in bytes to be filled out in Finish. |
| 32 message_name |
| 33 }; |
| 34 COMPILE_ASSERT(kMessageHeaderSize == sizeof(message_header), |
| 35 unexpected_message_header_size); |
| 36 |
| 37 return AppendRawBytes(&message_header, sizeof(message_header)); |
| 38 } |
| 39 |
| 40 bool MessageBuilder::Append(uint16_t name, int8_t value) { |
| 41 return AppendU32(name, kMessageFieldType_Int8, static_cast<uint8_t>(value)); |
| 42 } |
| 43 |
| 44 bool MessageBuilder::Append(uint16_t name, int16_t value) { |
| 45 return AppendU32(name, kMessageFieldType_Int16, static_cast<uint16_t>(value)); |
| 46 } |
| 47 |
| 48 bool MessageBuilder::Append(uint16_t name, int32_t value) { |
| 49 return AppendU32(name, kMessageFieldType_Int32, static_cast<uint32_t>(value)); |
| 50 } |
| 51 |
| 52 bool MessageBuilder::Append(uint16_t name, int64_t value) { |
| 53 return AppendU64(name, kMessageFieldType_Int64, static_cast<uint64_t>(value)); |
| 54 } |
| 55 |
| 56 bool MessageBuilder::Append(uint16_t name, uint8_t value) { |
| 57 return AppendU32(name, kMessageFieldType_Uint8, value); |
| 58 } |
| 59 |
| 60 bool MessageBuilder::Append(uint16_t name, uint16_t value) { |
| 61 return AppendU32(name, kMessageFieldType_Uint16, value); |
| 62 } |
| 63 |
| 64 bool MessageBuilder::Append(uint16_t name, uint32_t value) { |
| 65 return AppendU32(name, kMessageFieldType_Uint32, value); |
| 66 } |
| 67 |
| 68 bool MessageBuilder::Append(uint16_t name, uint64_t value) { |
| 69 return AppendU64(name, kMessageFieldType_Uint64, value); |
| 70 } |
| 71 |
| 72 bool MessageBuilder::Append(uint16_t name, const std::string& value) { |
| 73 return AppendArray(name, kMessageFieldType_String, value.data(), |
| 74 value.size()); |
| 75 } |
| 76 |
| 77 bool MessageBuilder::Append(uint16_t name, const void* bytes, |
| 78 size_t num_bytes) { |
| 79 return AppendArray(name, kMessageFieldType_Bytes, bytes, num_bytes); |
| 80 } |
| 81 |
| 82 bool MessageBuilder::Append(uint16_t name, Handle handle) { |
| 83 uint32_t index = static_cast<uint32_t>(handles_.size()); |
| 84 |
| 85 if (!AppendU32(name, kMessageFieldType_Handle, index)) |
| 86 return false; |
| 87 |
| 88 handles_.push_back(handle); |
| 89 |
| 90 // TODO(darin): Should we even worry about memory allocation failure? |
| 91 return handles_.size() == index + 1; |
| 92 } |
| 93 |
| 94 bool MessageBuilder::Append(uint16_t name, const Message& message) { |
| 95 if (!AppendArray(name, kMessageFieldType_Message, &message.data()[0], |
| 96 message.data().size())) |
| 97 return false; |
| 98 |
| 99 size_t size_before = handles_.size(); |
| 100 handles_.insert(handles_.end(), |
| 101 message.handles().begin(), |
| 102 message.handles().end()); |
| 103 |
| 104 // TODO(darin): Should we even worry about memory allocation failure? |
| 105 return handles_.size() == size_before + message.handles().size(); |
| 106 } |
| 107 |
| 108 bool MessageBuilder::Finish(Message* message) { |
| 109 if (data_.empty()) |
| 110 return false; |
| 111 |
| 112 // Initialize should have been called. |
| 113 DCHECK(data_.size() >= kMessageHeaderSize); |
| 114 |
| 115 uint32_t payload_size = |
| 116 static_cast<uint32_t>(data_.size() - sizeof(uint32_t)); |
| 117 |
| 118 // Stamp payload size into the message. |
| 119 memcpy(&data_[0], &payload_size, sizeof(payload_size)); |
| 120 |
| 121 message->data_.swap(data_); |
| 122 message->handles_.swap(handles_); |
| 123 return true; |
| 124 } |
| 125 |
| 126 bool MessageBuilder::AppendU32(uint16_t name, MessageFieldType field_type, |
| 127 uint32_t value) { |
| 128 return AppendHeader(name, field_type) && |
| 129 AppendRawBytes(&value, sizeof(value)); |
| 130 } |
| 131 |
| 132 bool MessageBuilder::AppendU64(uint16_t name, MessageFieldType field_type, |
| 133 uint64_t value) { |
| 134 // Insert padding to achieve 8-byte alignment. |
| 135 return AppendHeader(name, field_type) && |
| 136 AppendPadding(4U) && |
| 137 AppendRawBytes(&value, sizeof(value)); |
| 138 } |
| 139 |
| 140 bool MessageBuilder::AppendArray(uint16_t name, MessageFieldType field_type, |
| 141 const void* bytes, size_t num_bytes) { |
| 142 if (num_bytes > std::numeric_limits<uint32_t>::max()) |
| 143 return false; |
| 144 uint32_t size = static_cast<uint32_t>(num_bytes); |
| 145 |
| 146 // Append padding to achieve 8-byte alignment. |
| 147 size_t padding_size = kAlignment - num_bytes % kAlignment; |
| 148 |
| 149 return AppendHeader(name, field_type) && |
| 150 AppendRawBytes(&size, sizeof(size)) && |
| 151 AppendRawBytes(bytes, size) && |
| 152 AppendPadding(padding_size); |
| 153 } |
| 154 |
| 155 bool MessageBuilder::AppendHeader(uint16_t name, MessageFieldType field_type) { |
| 156 // Initialize should have been called. |
| 157 DCHECK(data_.size() >= kMessageHeaderSize); |
| 158 |
| 159 uint32_t header = static_cast<uint32_t>(name) << 16 | |
| 160 static_cast<uint32_t>(field_type); |
| 161 return AppendRawBytes(&header, sizeof(header)); |
| 162 } |
| 163 |
| 164 bool MessageBuilder::AppendPadding(size_t num_bytes) { |
| 165 if (num_bytes == 0) |
| 166 return true; |
| 167 DCHECK(num_bytes < kAlignment); |
| 168 |
| 169 const uint8_t kNulls[kAlignment - 1] = { 0 }; |
| 170 return AppendRawBytes(kNulls, num_bytes); |
| 171 } |
| 172 |
| 173 bool MessageBuilder::AppendRawBytes(const void* bytes, size_t num_bytes) { |
| 174 if (!num_bytes) |
| 175 return true; |
| 176 |
| 177 const uint8_t* data_start = static_cast<const uint8_t*>(bytes); |
| 178 const uint8_t* data_end = data_start + num_bytes; |
| 179 |
| 180 size_t size_before = data_.size(); |
| 181 |
| 182 // TODO(darin): Call reserve() here? |
| 183 data_.insert(data_.end(), data_start, data_end); |
| 184 |
| 185 // TODO(darin): Should we even worry about memory allocation failure? |
| 186 return data_.size() == size_before + num_bytes; |
| 187 } |
| 188 |
| 189 } // namespace mojo |
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