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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/system/message_in_transit.h" | |
| 6 | |
| 7 #include <string.h> | |
| 8 | |
| 9 #include "base/compiler_specific.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "mojo/system/constants.h" | |
| 12 #include "mojo/system/transport_data.h" | |
| 13 | |
| 14 namespace mojo { | |
| 15 namespace system { | |
| 16 | |
| 17 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Type | |
| 18 MessageInTransit::kTypeMessagePipeEndpoint; | |
| 19 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Type | |
| 20 MessageInTransit::kTypeMessagePipe; | |
| 21 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Type | |
| 22 MessageInTransit::kTypeChannel; | |
| 23 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Type | |
| 24 MessageInTransit::kTypeRawChannel; | |
| 25 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype | |
| 26 MessageInTransit::kSubtypeMessagePipeEndpointData; | |
| 27 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype | |
| 28 MessageInTransit::kSubtypeChannelRunMessagePipeEndpoint; | |
| 29 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype | |
| 30 MessageInTransit::kSubtypeChannelRemoveMessagePipeEndpoint; | |
| 31 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype | |
| 32 MessageInTransit::kSubtypeChannelRemoveMessagePipeEndpointAck; | |
| 33 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::Subtype | |
| 34 MessageInTransit::kSubtypeRawChannelPosixExtraPlatformHandles; | |
| 35 STATIC_CONST_MEMBER_DEFINITION const MessageInTransit::EndpointId | |
| 36 MessageInTransit::kInvalidEndpointId; | |
| 37 STATIC_CONST_MEMBER_DEFINITION const size_t MessageInTransit::kMessageAlignment; | |
| 38 | |
| 39 struct MessageInTransit::PrivateStructForCompileAsserts { | |
| 40 // The size of |Header| must be a multiple of the alignment. | |
| 41 static_assert(sizeof(Header) % kMessageAlignment == 0, | |
| 42 "sizeof(MessageInTransit::Header) invalid"); | |
| 43 // Avoid dangerous situations, but making sure that the size of the "header" + | |
| 44 // the size of the data fits into a 31-bit number. | |
| 45 static_assert(static_cast<uint64_t>(sizeof(Header)) + kMaxMessageNumBytes <= | |
| 46 0x7fffffffULL, | |
| 47 "kMaxMessageNumBytes too big"); | |
| 48 | |
| 49 // We assume (to avoid extra rounding code) that the maximum message (data) | |
| 50 // size is a multiple of the alignment. | |
| 51 static_assert(kMaxMessageNumBytes % kMessageAlignment == 0, | |
| 52 "kMessageAlignment not a multiple of alignment"); | |
| 53 }; | |
| 54 | |
| 55 MessageInTransit::View::View(size_t message_size, const void* buffer) | |
| 56 : buffer_(buffer) { | |
| 57 size_t next_message_size = 0; | |
| 58 DCHECK(MessageInTransit::GetNextMessageSize( | |
| 59 buffer_, message_size, &next_message_size)); | |
| 60 DCHECK_EQ(message_size, next_message_size); | |
| 61 // This should be equivalent. | |
| 62 DCHECK_EQ(message_size, total_size()); | |
| 63 } | |
| 64 | |
| 65 bool MessageInTransit::View::IsValid(size_t serialized_platform_handle_size, | |
| 66 const char** error_message) const { | |
| 67 // Note: This also implies a check on the |main_buffer_size()|, which is just | |
| 68 // |RoundUpMessageAlignment(sizeof(Header) + num_bytes())|. | |
| 69 if (num_bytes() > kMaxMessageNumBytes) { | |
| 70 *error_message = "Message data payload too large"; | |
| 71 return false; | |
| 72 } | |
| 73 | |
| 74 if (transport_data_buffer_size() > 0) { | |
| 75 const char* e = | |
| 76 TransportData::ValidateBuffer(serialized_platform_handle_size, | |
| 77 transport_data_buffer(), | |
| 78 transport_data_buffer_size()); | |
| 79 if (e) { | |
| 80 *error_message = e; | |
| 81 return false; | |
| 82 } | |
| 83 } | |
| 84 | |
| 85 return true; | |
| 86 } | |
| 87 | |
| 88 MessageInTransit::MessageInTransit(Type type, | |
| 89 Subtype subtype, | |
| 90 uint32_t num_bytes, | |
| 91 const void* bytes) | |
| 92 : main_buffer_size_(RoundUpMessageAlignment(sizeof(Header) + num_bytes)), | |
| 93 main_buffer_(static_cast<char*>( | |
| 94 base::AlignedAlloc(main_buffer_size_, kMessageAlignment))) { | |
| 95 ConstructorHelper(type, subtype, num_bytes); | |
| 96 if (bytes) { | |
| 97 memcpy(MessageInTransit::bytes(), bytes, num_bytes); | |
| 98 memset(static_cast<char*>(MessageInTransit::bytes()) + num_bytes, | |
| 99 0, | |
| 100 main_buffer_size_ - sizeof(Header) - num_bytes); | |
| 101 } else { | |
| 102 memset(MessageInTransit::bytes(), 0, main_buffer_size_ - sizeof(Header)); | |
| 103 } | |
| 104 } | |
| 105 | |
| 106 MessageInTransit::MessageInTransit(Type type, | |
| 107 Subtype subtype, | |
| 108 uint32_t num_bytes, | |
| 109 UserPointer<const void> bytes) | |
| 110 : main_buffer_size_(RoundUpMessageAlignment(sizeof(Header) + num_bytes)), | |
| 111 main_buffer_(static_cast<char*>( | |
| 112 base::AlignedAlloc(main_buffer_size_, kMessageAlignment))) { | |
| 113 ConstructorHelper(type, subtype, num_bytes); | |
| 114 bytes.GetArray(MessageInTransit::bytes(), num_bytes); | |
| 115 } | |
| 116 | |
| 117 MessageInTransit::MessageInTransit(const View& message_view) | |
| 118 : main_buffer_size_(message_view.main_buffer_size()), | |
| 119 main_buffer_(static_cast<char*>( | |
| 120 base::AlignedAlloc(main_buffer_size_, kMessageAlignment))) { | |
| 121 DCHECK_GE(main_buffer_size_, sizeof(Header)); | |
| 122 DCHECK_EQ(main_buffer_size_ % kMessageAlignment, 0u); | |
| 123 | |
| 124 memcpy(main_buffer_.get(), message_view.main_buffer(), main_buffer_size_); | |
| 125 DCHECK_EQ(main_buffer_size_, | |
| 126 RoundUpMessageAlignment(sizeof(Header) + num_bytes())); | |
| 127 } | |
| 128 | |
| 129 MessageInTransit::~MessageInTransit() { | |
| 130 if (dispatchers_) { | |
| 131 for (size_t i = 0; i < dispatchers_->size(); i++) { | |
| 132 if (!(*dispatchers_)[i].get()) | |
| 133 continue; | |
| 134 | |
| 135 DCHECK((*dispatchers_)[i]->HasOneRef()); | |
| 136 (*dispatchers_)[i]->Close(); | |
| 137 } | |
| 138 } | |
| 139 } | |
| 140 | |
| 141 // static | |
| 142 bool MessageInTransit::GetNextMessageSize(const void* buffer, | |
| 143 size_t buffer_size, | |
| 144 size_t* next_message_size) { | |
| 145 DCHECK(next_message_size); | |
| 146 if (!buffer_size) | |
| 147 return false; | |
| 148 DCHECK(buffer); | |
| 149 DCHECK_EQ( | |
| 150 reinterpret_cast<uintptr_t>(buffer) % MessageInTransit::kMessageAlignment, | |
| 151 0u); | |
| 152 | |
| 153 if (buffer_size < sizeof(Header)) | |
| 154 return false; | |
| 155 | |
| 156 const Header* header = static_cast<const Header*>(buffer); | |
| 157 *next_message_size = header->total_size; | |
| 158 DCHECK_EQ(*next_message_size % kMessageAlignment, 0u); | |
| 159 return true; | |
| 160 } | |
| 161 | |
| 162 void MessageInTransit::SetDispatchers( | |
| 163 scoped_ptr<DispatcherVector> dispatchers) { | |
| 164 DCHECK(dispatchers); | |
| 165 DCHECK(!dispatchers_); | |
| 166 DCHECK(!transport_data_); | |
| 167 | |
| 168 dispatchers_ = dispatchers.Pass(); | |
| 169 #ifndef NDEBUG | |
| 170 for (size_t i = 0; i < dispatchers_->size(); i++) | |
| 171 DCHECK(!(*dispatchers_)[i].get() || (*dispatchers_)[i]->HasOneRef()); | |
| 172 #endif | |
| 173 } | |
| 174 | |
| 175 void MessageInTransit::SetTransportData( | |
| 176 scoped_ptr<TransportData> transport_data) { | |
| 177 DCHECK(transport_data); | |
| 178 DCHECK(!transport_data_); | |
| 179 DCHECK(!dispatchers_); | |
| 180 | |
| 181 transport_data_ = transport_data.Pass(); | |
| 182 } | |
| 183 | |
| 184 void MessageInTransit::SerializeAndCloseDispatchers(Channel* channel) { | |
| 185 DCHECK(channel); | |
| 186 DCHECK(!transport_data_); | |
| 187 | |
| 188 if (!dispatchers_ || !dispatchers_->size()) | |
| 189 return; | |
| 190 | |
| 191 transport_data_.reset(new TransportData(dispatchers_.Pass(), channel)); | |
| 192 | |
| 193 // Update the sizes in the message header. | |
| 194 UpdateTotalSize(); | |
| 195 } | |
| 196 | |
| 197 void MessageInTransit::ConstructorHelper(Type type, | |
| 198 Subtype subtype, | |
| 199 uint32_t num_bytes) { | |
| 200 DCHECK_LE(num_bytes, kMaxMessageNumBytes); | |
| 201 | |
| 202 // |total_size| is updated below, from the other values. | |
| 203 header()->type = type; | |
| 204 header()->subtype = subtype; | |
| 205 header()->source_id = kInvalidEndpointId; | |
| 206 header()->destination_id = kInvalidEndpointId; | |
| 207 header()->num_bytes = num_bytes; | |
| 208 header()->unused = 0; | |
| 209 // Note: If dispatchers are subsequently attached, then |total_size| will have | |
| 210 // to be adjusted. | |
| 211 UpdateTotalSize(); | |
| 212 } | |
| 213 | |
| 214 void MessageInTransit::UpdateTotalSize() { | |
| 215 DCHECK_EQ(main_buffer_size_ % kMessageAlignment, 0u); | |
| 216 header()->total_size = static_cast<uint32_t>(main_buffer_size_); | |
| 217 if (transport_data_) { | |
| 218 header()->total_size += | |
| 219 static_cast<uint32_t>(transport_data_->buffer_size()); | |
| 220 } | |
| 221 } | |
| 222 | |
| 223 } // namespace system | |
| 224 } // namespace mojo | |
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Chromium Code Reviews
Issue 621153003:
Move mojo edk into mojo/edk (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master