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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <windows.h>
#include <stack>
#include "chrome/common/ipc_sync_message.h"
#include "base/logging.h"
namespace IPC {
uint32 SyncMessage::next_id_ = 0;
#define kSyncMessageHeaderSize 4
// A dummy handle used by EnableMessagePumping.
HANDLE dummy_event = ::CreateEvent(NULL, TRUE, TRUE, NULL);
SyncMessage::SyncMessage(
int32 routing_id,
WORD 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);
void* iter = NULL;
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
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