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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2011,2017 Igalia S.L.
*
* 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.
*/
#pragma once
#include "Attachment.h"
#include "Encoder.h"
#include <wtf/Vector.h>
namespace IPC {
class MessageInfo {
public:
MessageInfo()
{
// The entire MessageInfo is passed to write(), so we have to zero our
// padding bytes to avoid writing uninitialized memory.
memset(static_cast<void*>(this), 0, sizeof(*this));
}
MessageInfo(size_t bodySize, size_t initialAttachmentCount)
{
memset(static_cast<void*>(this), 0, sizeof(*this));
m_bodySize = bodySize;
m_attachmentCount = initialAttachmentCount;
}
MessageInfo(const MessageInfo& info)
{
memset(static_cast<void*>(this), 0, sizeof(*this));
*this = info;
}
MessageInfo& operator=(const MessageInfo&) = default;
void setBodyOutOfLine()
{
ASSERT(!isBodyOutOfLine());
m_isBodyOutOfLine = true;
m_attachmentCount++;
}
bool isBodyOutOfLine() const { return m_isBodyOutOfLine; }
size_t bodySize() const { return m_bodySize; }
size_t attachmentCount() const { return m_attachmentCount; }
private:
// The MessageInfo will be copied using memcpy, so all members must be trivially copyable.
size_t m_bodySize;
size_t m_attachmentCount;
bool m_isBodyOutOfLine;
};
class UnixMessage {
WTF_MAKE_FAST_ALLOCATED;
public:
UnixMessage(Encoder& encoder)
: m_attachments(encoder.releaseAttachments())
, m_messageInfo(encoder.bufferSize(), m_attachments.size())
, m_body(encoder.buffer())
{
}
UnixMessage(UnixMessage&& other)
: m_attachments(WTFMove(other.m_attachments))
, m_messageInfo(WTFMove(other.m_messageInfo))
{
if (other.m_bodyOwned) {
std::swap(m_body, other.m_body);
std::swap(m_bodyOwned, other.m_bodyOwned);
} else if (!m_messageInfo.isBodyOutOfLine()) {
m_body = static_cast<uint8_t*>(fastMalloc(m_messageInfo.bodySize()));
memcpy(m_body, other.m_body, m_messageInfo.bodySize());
m_bodyOwned = true;
other.m_body = nullptr;
other.m_bodyOwned = false;
}
}
~UnixMessage()
{
if (m_bodyOwned)
fastFree(m_body);
}
const Vector<Attachment>& attachments() const { return m_attachments; }
MessageInfo& messageInfo() { return m_messageInfo; }
uint8_t* body() const { return m_body; }
size_t bodySize() const { return m_messageInfo.bodySize(); }
void appendAttachment(Attachment&& attachment)
{
m_attachments.append(WTFMove(attachment));
}
private:
Vector<Attachment> m_attachments;
MessageInfo m_messageInfo;
uint8_t* m_body { nullptr };
bool m_bodyOwned { false };
};
} // namespace IPC
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