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/*
* Copyright (C) 2010 Apple Inc. All rights reserved.
* Copyright (c) 2010, Google 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 TypedArrayBase_h
#define TypedArrayBase_h
#include <wtf/ArrayBuffer.h>
#include <wtf/ArrayBufferView.h>
namespace WTF {
template <typename T>
class TypedArrayBase : public ArrayBufferView {
public:
T* data() const { return static_cast<T*>(baseAddress()); }
bool set(TypedArrayBase<T>* array, unsigned offset)
{
return setImpl(array, offset * sizeof(T));
}
bool setRange(const T* data, size_t dataLength, unsigned offset)
{
return setRangeImpl(reinterpret_cast<const char*>(data), dataLength * sizeof(T), offset * sizeof(T));
}
bool zeroRange(unsigned offset, size_t length)
{
return zeroRangeImpl(offset * sizeof(T), length * sizeof(T));
}
// Overridden from ArrayBufferView. This must be public because of
// rules about inheritance of members in template classes, and
// because it is accessed via pointers to subclasses.
unsigned length() const
{
return m_length;
}
virtual unsigned byteLength() const
{
return m_length * sizeof(T);
}
// Invoked by the indexed getter. Does not perform range checks; caller
// is responsible for doing so and returning undefined as necessary.
T item(unsigned index) const
{
ASSERT_WITH_SECURITY_IMPLICATION(index < TypedArrayBase<T>::m_length);
return TypedArrayBase<T>::data()[index];
}
bool checkInboundData(unsigned offset, unsigned pos) const
{
return (offset <= m_length
&& offset + pos <= m_length
// check overflow
&& offset + pos >= offset);
}
protected:
TypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length)
: ArrayBufferView(buffer, byteOffset)
, m_length(length)
{
}
template <class Subclass>
static PassRefPtr<Subclass> create(unsigned length)
{
RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, sizeof(T));
if (!buffer.get())
return 0;
return create<Subclass>(buffer, 0, length);
}
template <class Subclass>
static PassRefPtr<Subclass> create(const T* array, unsigned length)
{
RefPtr<Subclass> a = create<Subclass>(length);
if (a)
for (unsigned i = 0; i < length; ++i)
a->set(i, array[i]);
return a;
}
template <class Subclass>
static PassRefPtr<Subclass> create(PassRefPtr<ArrayBuffer> buffer,
unsigned byteOffset,
unsigned length)
{
RefPtr<ArrayBuffer> buf(buffer);
if (!verifySubRange<T>(buf, byteOffset, length))
return 0;
return adoptRef(new Subclass(buf, byteOffset, length));
}
template <class Subclass>
static PassRefPtr<Subclass> createUninitialized(unsigned length)
{
RefPtr<ArrayBuffer> buffer = ArrayBuffer::createUninitialized(length, sizeof(T));
if (!buffer.get())
return 0;
return create<Subclass>(buffer, 0, length);
}
template <class Subclass>
PassRefPtr<Subclass> subarrayImpl(int start, int end) const
{
unsigned offset, length;
calculateOffsetAndLength(start, end, m_length, &offset, &length);
clampOffsetAndNumElements<T>(buffer(), m_byteOffset, &offset, &length);
return create<Subclass>(buffer(), offset, length);
}
virtual void neuter()
{
ArrayBufferView::neuter();
m_length = 0;
}
// We do not want to have to access this via a virtual function in subclasses,
// which is why it is protected rather than private.
unsigned m_length;
};
} // namespace WTF
using WTF::TypedArrayBase;
#endif // TypedArrayBase_h
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