/*
 * Copyright (C) 2012 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 "config.h"
#include "MessageDecoder.h"

#include "ArgumentCoders.h"
#include "DataReference.h"
#include "MessageFlags.h"
#include "StringReference.h"

#if PLATFORM(MAC)
#include "ImportanceAssertion.h"
#endif

namespace IPC {

MessageDecoder::~MessageDecoder()
{
#if HAVE(QOS_CLASSES)
    if (m_qosClassOverride)
        pthread_override_qos_class_end_np(m_qosClassOverride);
#endif
}

MessageDecoder::MessageDecoder(const DataReference& buffer, Vector<Attachment> attachments)
    : ArgumentDecoder(buffer.data(), buffer.size(), WTFMove(attachments))
{
    if (!decode(m_messageFlags))
        return;

    if (!decode(m_messageReceiverName))
        return;

    if (!decode(m_messageName))
        return;

    if (!decode(m_destinationID))
        return;
#if HAVE(DTRACE)
    decode(m_UUID);
#endif
}

bool MessageDecoder::isSyncMessage() const
{
    return m_messageFlags & SyncMessage;
}

bool MessageDecoder::shouldDispatchMessageWhenWaitingForSyncReply() const
{
    return m_messageFlags & DispatchMessageWhenWaitingForSyncReply;
}

bool MessageDecoder::shouldUseFullySynchronousModeForTesting() const
{
    return m_messageFlags & UseFullySynchronousModeForTesting;
}

#if PLATFORM(MAC)
void MessageDecoder::setImportanceAssertion(std::unique_ptr<ImportanceAssertion> assertion)
{
    m_importanceAssertion = WTFMove(assertion);
}
#endif

std::unique_ptr<MessageDecoder> MessageDecoder::unwrapForTesting(MessageDecoder& decoder)
{
    ASSERT(decoder.isSyncMessage());

    Vector<Attachment> attachments;
    Attachment attachment;
    while (decoder.removeAttachment(attachment))
        attachments.append(WTFMove(attachment));
    attachments.reverse();

    DataReference wrappedMessage;
    if (!decoder.decode(wrappedMessage))
        return nullptr;

    return std::make_unique<MessageDecoder>(wrappedMessage, WTFMove(attachments));
}

} // namespace IPC