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/*
* Copyright (C) 2013 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 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 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 DataView_h
#define DataView_h
#include "ArrayBufferView.h"
#include <wtf/FlipBytes.h>
#include <wtf/PassRefPtr.h>
namespace JSC {
class DataView : public ArrayBufferView {
protected:
DataView(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned byteLength);
public:
JS_EXPORT_PRIVATE static Ref<DataView> create(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned length);
static Ref<DataView> create(PassRefPtr<ArrayBuffer>);
virtual unsigned byteLength() const override
{
return m_byteLength;
}
virtual TypedArrayType getType() const override
{
return TypeDataView;
}
virtual JSArrayBufferView* wrap(ExecState*, JSGlobalObject*) override;
template<typename T>
T get(unsigned offset, bool littleEndian, bool* status = 0)
{
if (status) {
if (offset + sizeof(T) > byteLength()) {
*status = false;
return T();
}
*status = true;
} else
ASSERT_WITH_SECURITY_IMPLICATION(offset + sizeof(T) <= byteLength());
return flipBytesIfLittleEndian(
*reinterpret_cast<T*>(static_cast<uint8_t*>(m_baseAddress) + offset),
littleEndian);
}
template<typename T>
T read(unsigned& offset, bool littleEndian, bool* status = 0)
{
T result = this->template get<T>(offset, littleEndian, status);
if (!status || *status)
offset += sizeof(T);
return result;
}
template<typename T>
void set(unsigned offset, T value, bool littleEndian, bool* status = 0)
{
if (status) {
if (offset + sizeof(T) > byteLength()) {
*status = false;
return;
}
*status = true;
} else
ASSERT_WITH_SECURITY_IMPLICATION(offset + sizeof(T) <= byteLength());
*reinterpret_cast<T*>(static_cast<uint8_t*>(m_baseAddress) + offset) =
flipBytesIfLittleEndian(value, littleEndian);
}
private:
unsigned m_byteLength;
};
} // namespace JSC
#endif // DataView_h
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