#ifndef ArrayBufferView_h
#define ArrayBufferView_h
#include "ArrayBuffer.h"
#include "ExceptionCode.h"
#include <algorithm>
#include <limits.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.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; }
virtual bool isDataView() const { return false; }
PassRefPtr<ArrayBuffer> buffer() const
{
return m_buffer;
}
void* baseAddress() const
{
return m_baseAddress;
}
unsigned byteOffset() const
{
return m_byteOffset;
}
virtual unsigned byteLength() const = 0;
virtual ~ArrayBufferView();
protected:
ArrayBufferView(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset);
void setImpl(ArrayBufferView* array, unsigned byteOffset, ExceptionCode& ec);
void setRangeImpl(const char* data, size_t dataByteLength, unsigned byteOffset, ExceptionCode& ec);
void zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength, ExceptionCode& ec);
static void calculateOffsetAndLength(int start, int end, unsigned arraySize,
unsigned* offset, unsigned* length);
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;
}
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);
}
void* m_baseAddress;
unsigned m_byteOffset;
private:
RefPtr<ArrayBuffer> m_buffer;
};
}
#endif // ArrayBufferView_h