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/*
* Copyright (C) 2009 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 COMPUTER, INC. ``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 COMPUTER, INC. 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.
*/
#ifndef ArrayBufferView_h
#define ArrayBufferView_h
#include <algorithm>
#include "ExceptionCode.h"
#include <limits.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include "ArrayBuffer.h"
namespace WebCore {
class ArrayBufferView : public RefCounted<ArrayBufferView> {
public:
virtual bool isByteArray() const { return false; }
virtual bool isUnsignedByteArray() const { return false; }
virtual bool isShortArray() const { return false; }
virtual bool isUnsignedShortArray() const { return false; }
virtual bool isIntArray() const { return false; }
virtual bool isUnsignedIntArray() const { return false; }
virtual bool isFloatArray() const { return false; }
PassRefPtr<ArrayBuffer> buffer() const
{
return m_buffer;
}
void* baseAddress() const
{
return m_baseAddress;
}
unsigned byteOffset() const
{
return m_byteOffset;
}
virtual unsigned length() const = 0;
virtual unsigned byteLength() const = 0;
virtual PassRefPtr<ArrayBufferView> slice(int start, int end) const = 0;
virtual ~ArrayBufferView();
protected:
ArrayBufferView(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset);
void setImpl(ArrayBufferView* array, unsigned byteOffset, ExceptionCode& ec);
static void calculateOffsetAndLength(int start, int end, unsigned arraySize,
unsigned* offset, unsigned* length);
// Helper to verify that a given sub-range of an ArrayBuffer is
// within range.
template <typename T>
static bool verifySubRange(PassRefPtr<ArrayBuffer> buffer,
unsigned byteOffset,
unsigned numElements)
{
if (!buffer)
return false;
if (sizeof(T) > 1 && byteOffset % sizeof(T))
return false;
if (byteOffset > buffer->byteLength())
return false;
unsigned remainingElements = (buffer->byteLength() - byteOffset) / sizeof(T);
if (numElements > remainingElements)
return false;
return true;
}
// Input offset is in number of elements from this array's view;
// output offset is in number of bytes from the underlying buffer's view.
template <typename T>
static void clampOffsetAndNumElements(PassRefPtr<ArrayBuffer> buffer,
unsigned arrayByteOffset,
unsigned *offset,
unsigned *numElements)
{
unsigned maxOffset = (UINT_MAX - arrayByteOffset) / sizeof(T);
if (*offset > maxOffset) {
*offset = buffer->byteLength();
*numElements = 0;
return;
}
*offset = arrayByteOffset + *offset * sizeof(T);
*offset = std::min(buffer->byteLength(), *offset);
unsigned remainingElements = (buffer->byteLength() - *offset) / sizeof(T);
*numElements = std::min(remainingElements, *numElements);
}
// This is the address of the ArrayBuffer's storage, plus the byte offset.
void* m_baseAddress;
unsigned m_byteOffset;
private:
RefPtr<ArrayBuffer> m_buffer;
};
} // namespace WebCore
#endif // ArrayBufferView_h
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