content/common/message_port_message.h

// Copyright 2017 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 CONTENT_COMMON_MESSAGE_PORT_MESSAGE_H_
#define CONTENT_COMMON_MESSAGE_PORT_MESSAGE_H_

#include <vector>
#include "mojo/public/cpp/bindings/array_traits_span.h"
#include "mojo/public/cpp/system/message_pipe.h"

namespace content {

// This struct represents messages as they are posted over a message port. This
// type can be serialized as a content::mojom::MessagePortMessage struct.
struct MessagePortMessage {
  MessagePortMessage();
  ~MessagePortMessage();

  // To reduce copies when serializing |encoded_message| does not have to point
  // to |owned_encoded_message|. The serialization code completely ignores the
  // |owned_encoded_message| and just serializes whatever |encoded_message|
  // points to. When deserializing |owned_encoded_message| is set to the data
  // and |encoded_message| is set to point to |owned_encoded_message|.
  mojo::ConstCArray<uint8_t> encoded_message;
  std::vector<uint8_t> owned_encoded_message;

  // Any ports being transfered as part of this message.
  std::vector<mojo::ScopedMessagePipeHandle> ports;
};

}  // namespace content

#endif  // CONTENT_COMMON_MESSAGE_PORT_MESSAGE_H_