#ifndef ArrayBufferView_h
#define ArrayBufferView_h
#include "ArrayBuffer.h"
#include <algorithm>
#include <limits.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
namespace WTF {
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 isDoubleArray() 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>, unsigned byteOffset);
inline bool setImpl(ArrayBufferView*, unsigned byteOffset);
inline bool setRangeImpl(const char* data, size_t dataByteLength, unsigned byteOffset);
inline bool zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength);
static inline 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);
}
virtual void neuter();
void* m_baseAddress;
unsigned m_byteOffset;
private:
friend class ArrayBuffer;
RefPtr<ArrayBuffer> m_buffer;
ArrayBufferView* m_prevView;
ArrayBufferView* m_nextView;
};
bool ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset)
{
if (byteOffset > byteLength()
|| byteOffset + array->byteLength() > byteLength()
|| byteOffset + array->byteLength() < byteOffset) {
return false;
}
char* base = static_cast<char*>(baseAddress());
memmove(base + byteOffset, array->baseAddress(), array->byteLength());
return true;
}
bool ArrayBufferView::setRangeImpl(const char* data, size_t dataByteLength, unsigned byteOffset)
{
if (byteOffset > byteLength()
|| byteOffset + dataByteLength > byteLength()
|| byteOffset + dataByteLength < byteOffset) {
return false;
}
char* base = static_cast<char*>(baseAddress());
memmove(base + byteOffset, data, dataByteLength);
return true;
}
bool ArrayBufferView::zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength)
{
if (byteOffset > byteLength()
|| byteOffset + rangeByteLength > byteLength()
|| byteOffset + rangeByteLength < byteOffset) {
return false;
}
char* base = static_cast<char*>(baseAddress());
memset(base + byteOffset, 0, rangeByteLength);
return true;
}
void ArrayBufferView::calculateOffsetAndLength(int start, int end, unsigned arraySize,
unsigned* offset, unsigned* length)
{
if (start < 0)
start += arraySize;
if (start < 0)
start = 0;
if (end < 0)
end += arraySize;
if (end < 0)
end = 0;
if (end < start)
end = start;
*offset = static_cast<unsigned>(start);
*length = static_cast<unsigned>(end - start);
}
}
using WTF::ArrayBufferView;
#endif // ArrayBufferView_h