Separates ipc code from common (http://crbug.com/16829)

ipc/ipc_sync_message.cc

+// Copyright (c) 2006-2008 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.
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#endif
+#include <stack>
+
+#include "base/logging.h"
+#include "base/waitable_event.h"
+#include "ipc/ipc_sync_message.h"
+
+namespace IPC {
+
+uint32 SyncMessage::next_id_ = 0;
+#define kSyncMessageHeaderSize 4
+
+base::WaitableEvent* dummy_event = new base::WaitableEvent(true, true);
+
+SyncMessage::SyncMessage(
+    int32 routing_id,
+    uint16 type,
+    PriorityValue priority,
+    MessageReplyDeserializer* deserializer)
+    : Message(routing_id, type, priority),
+      deserializer_(deserializer),
+      pump_messages_event_(NULL)
+      {
+  set_sync();
+  set_unblock(true);
+
+  // Add synchronous message data before the message payload.
+  SyncHeader header;
+  header.message_id = ++next_id_;
+  WriteSyncHeader(this, header);
+}
+
+MessageReplyDeserializer* SyncMessage::GetReplyDeserializer() {
+  MessageReplyDeserializer* rv = deserializer_;
+  DCHECK(rv);
+  deserializer_ = NULL;
+  return rv;
+}
+
+void SyncMessage::EnableMessagePumping() {
+  DCHECK(!pump_messages_event_);
+  set_pump_messages_event(dummy_event);
+}
+
+bool SyncMessage::IsMessageReplyTo(const Message& msg, int request_id) {
+  if (!msg.is_reply())
+    return false;
+
+  return GetMessageId(msg) == request_id;
+}
+
+void* SyncMessage::GetDataIterator(const Message* msg) {
+  void* iter = const_cast<char*>(msg->payload());
+  UpdateIter(&iter, kSyncMessageHeaderSize);
+  return iter;
+}
+
+int SyncMessage::GetMessageId(const Message& msg) {
+  if (!msg.is_sync() && !msg.is_reply())
+    return 0;
+
+  SyncHeader header;
+  if (!ReadSyncHeader(msg, &header))
+    return 0;
+
+  return header.message_id;
+}
+
+Message* SyncMessage::GenerateReply(const Message* msg) {
+  DCHECK(msg->is_sync());
+
+  Message* reply = new Message(msg->routing_id(), IPC_REPLY_ID,
+                               msg->priority());
+  reply->set_reply();
+
+  SyncHeader header;
+
+  // use the same message id, but this time reply bit is set
+  header.message_id = GetMessageId(*msg);
+  WriteSyncHeader(reply, header);
+
+  return reply;
+}
+
+bool SyncMessage::ReadSyncHeader(const Message& msg, SyncHeader* header) {
+  DCHECK(msg.is_sync() || msg.is_reply());
+
+  void* iter = NULL;
+  bool result = msg.ReadInt(&iter, &header->message_id);
+  if (!result) {
+    NOTREACHED();
+    return false;
+  }
+
+  return true;
+}
+
+bool SyncMessage::WriteSyncHeader(Message* msg, const SyncHeader& header) {
+  DCHECK(msg->is_sync() || msg->is_reply());
+  DCHECK(msg->payload_size() == 0);
+  bool result = msg->WriteInt(header.message_id);
+  if (!result) {
+    NOTREACHED();
+    return false;
+  }
+
+  // Note: if you add anything here, you need to update kSyncMessageHeaderSize.
+  DCHECK(kSyncMessageHeaderSize == msg->payload_size());
+
+  return true;
+}
+
+
+bool MessageReplyDeserializer::SerializeOutputParameters(const Message& msg) {
+  return SerializeOutputParameters(msg, SyncMessage::GetDataIterator(&msg));
+}
+
+}  // namespace IPC