[mojo] Ports EDK

mojo/edk/system/ports_message.h

+// Copyright 2016 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.
+
+#ifndef MOJO_EDK_SYSTEM_PORTS_MESSAGE_H__
+#define MOJO_EDK_SYSTEM_PORTS_MESSAGE_H__
+
+#include <utility>
+
+#include "base/memory/scoped_ptr.h"
+#include "mojo/edk/embedder/platform_handle_vector.h"
+#include "mojo/edk/system/channel.h"
+#include "mojo/edk/system/ports/message.h"
+
+namespace mojo {
+namespace edk {
+
+class NodeController;
+
+class PortsMessage : public ports::Message {
+ public:
+  static scoped_ptr<PortsMessage> NewUserMessage(size_t num_payload_bytes,
+                                                 size_t num_ports,
+                                                 size_t num_handles);
+
+  ~PortsMessage() override;
+
+  PlatformHandle* handles() { return channel_message_->handles(); }
+  size_t num_handles() const { return channel_message_->num_handles(); }
+  bool has_handles() const { return channel_message_->has_handles(); }
+
+  void SetHandles(ScopedPlatformHandleVectorPtr handles) {
+    channel_message_->SetHandles(std::move(handles));
+  }
+
+  Channel::MessagePtr TakeChannelMessage() {
+    return std::move(channel_message_);
+  }
+
+ private:
+  friend class NodeController;
+
+  // Construct a new user PortsMessage backed by a new Channel::Message.
+  PortsMessage(size_t num_payload_bytes, size_t num_ports, size_t num_handles);
+
+  // Construct a new PortsMessage backed by a Channel::Message. If
+  // |channel_message| is null, a new one is allocated internally.
+  PortsMessage(size_t num_header_bytes,
+               size_t num_payload_bytes,
+               size_t num_ports_bytes,
+               Channel::MessagePtr channel_message);
+
+  Channel::MessagePtr channel_message_;
+};
+
+}  // namespace edk
+}  // namespace mojo
+
+#endif  // MOJO_EDK_SYSTEM_PORTS_MESSAGE_H__