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/*
* Copyright (C) 2010 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.
*/
#ifndef ArgumentDecoder_h
#define ArgumentDecoder_h
#include "ArgumentCoder.h"
#include "Attachment.h"
#include <wtf/Vector.h>
namespace IPC {
class DataReference;
class ArgumentDecoder {
public:
ArgumentDecoder(const uint8_t* buffer, size_t bufferSize);
virtual ~ArgumentDecoder();
size_t length() const { return m_bufferEnd - m_buffer; }
bool isInvalid() const { return m_bufferPos > m_bufferEnd; }
void markInvalid() { m_bufferPos = m_bufferEnd + 1; }
bool decodeFixedLengthData(uint8_t*, size_t, unsigned alignment);
// The data in the data reference here will only be valid for the lifetime of the ArgumentDecoder object.
bool decodeVariableLengthByteArray(DataReference&);
bool decode(bool&);
bool decode(uint8_t&);
bool decode(uint16_t&);
bool decode(uint32_t&);
bool decode(uint64_t&);
bool decode(int32_t&);
bool decode(int64_t&);
bool decode(float&);
bool decode(double&);
template<typename T> bool decodeEnum(T& result)
{
static_assert(sizeof(T) <= 8, "Enum type T must not be larger than 64 bits!");
uint64_t value;
if (!decode(value))
return false;
result = static_cast<T>(value);
return true;
}
template<typename T>
bool bufferIsLargeEnoughToContain(size_t numElements) const
{
static_assert(std::is_arithmetic<T>::value, "Type T must have a fixed, known encoded size!");
if (numElements > std::numeric_limits<size_t>::max() / sizeof(T))
return false;
return bufferIsLargeEnoughToContain(alignof(T), numElements * sizeof(T));
}
// Generic type decode function.
template<typename T> bool decode(T& t)
{
return ArgumentCoder<T>::decode(*this, t);
}
bool removeAttachment(Attachment&);
protected:
ArgumentDecoder(const uint8_t* buffer, size_t bufferSize, Vector<Attachment>);
void initialize(const uint8_t* buffer, size_t bufferSize);
bool alignBufferPosition(unsigned alignment, size_t size);
bool bufferIsLargeEnoughToContain(unsigned alignment, size_t size) const;
private:
uint8_t* m_buffer;
uint8_t* m_bufferPos;
uint8_t* m_bufferEnd;
Vector<Attachment> m_attachments;
};
} // namespace IPC
#endif // ArgumentDecoder_h
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