Update mojo sdk to rev 9fbbc4f0fef1187312316c0ed992342474e139f1

mojo/public/dart/src/message.dart

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+part of bindings;
+
+class MessageHeader {
+  static const int kSimpleMessageSize = 16;
+  static const int kSimpleMessageNumFields = 2;
+  static const int kMessageWithRequestIdSize = 24;
+  static const int kMessageWithRequestIdNumFields = 3;
+  static const int kMessageTypeOffset = DataHeader.kHeaderSize;
+  static const int kMessageFlagsOffset = kMessageTypeOffset + 4;
+  static const int kMessageRequestIdOffset = kMessageFlagsOffset + 4;
+  static const int kMessageExpectsResponse = 1 << 0;
+  static const int kMessageIsResponse = 1 << 1;
+
+  DataHeader _header;
+  int type;
+  int flags;
+  int requestId;
+
+  static bool mustHaveRequestId(int flags) =>
+      (flags & (kMessageExpectsResponse | kMessageIsResponse)) != 0;
+
+  MessageHeader(this.type) :
+    _header = new DataHeader(kSimpleMessageSize, kSimpleMessageNumFields),
+    flags = 0,
+    requestId = 0;
+
+  MessageHeader.withRequestId(this.type, this.flags, this.requestId) :
+    _header = new DataHeader(
+        kMessageWithRequestIdSize, kMessageWithRequestIdNumFields);
+
+  MessageHeader.fromMessage(Message message) {
+    var decoder = new Decoder(message);
+    _header = decoder.decodeDataHeader();
+    type = decoder.decodeUint32(kMessageTypeOffset);
+    flags = decoder.decodeUint32(kMessageFlagsOffset);
+    if (mustHaveRequestId(flags)) {
+      if (_header.size < kMessageWithRequestIdSize) {
+        throw 'Incorrect message size. Got: ${_header.size} ' +
+              'wanted $kMessageWithRequestIdSize';
+      }
+      requestId = decoder.decodeUint64(kMessageRequestIdOffset);
+    } else {
+      requestId = 0;
+    }
+  }
+
+  int get size => _header.size;
+  bool get hasRequestId => mustHaveRequestId(flags);
+
+  void encode(Encoder encoder) {
+    encoder.encodeDataHeader(_header);
+    encoder.encodeUint32(type, kMessageTypeOffset);
+    encoder.encodeUint32(flags, kMessageFlagsOffset);
+    if (hasRequestId) {
+      encoder.encodeUint64(requestId, kMessageRequestIdOffset);
+    }
+  }
+
+  ServiceMessage get serviceMessage => new ServiceMessage(this);
+
+  String toString() => "MessageHeader($_header, $type, $flags, $requestId)";
+}
+
+
+class Message {
+  final ByteData buffer;
+  final List<core.MojoHandle> handles;
+  Message(this.buffer, this.handles);
+  String toString() =>
+      "Message(numBytes=${buffer.lengthInBytes}, numHandles=${handles.length})";
+}
+
+
+class ServiceMessage extends Message {
+  final MessageHeader header;
+  Message _payload;
+
+  ServiceMessage(Message message, this.header)
+      : super(message.buffer, message.handles);
+
+  ServiceMessage.fromMessage(Message message)
+      : this(message, new MessageHeader.fromMessage(message));
+
+  Message get payload {
+    if (_payload == null) {
+      var truncatedBuffer = new ByteData.view(buffer.buffer, header.size);
+      _payload = new Message(truncatedBuffer, handles);
+    }
+    return _payload;
+  }
+
+  String toString() => "ServiceMessage($header, $_payload)";
+}