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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 ArrayBuffer_h
#define ArrayBuffer_h
#include "wtf/ArrayBufferContents.h"
#include "wtf/HashSet.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/Vector.h"
#include "wtf/WTFExport.h"
namespace WTF {
class ArrayBuffer;
class ArrayBufferView;
class WTF_EXPORT ArrayBuffer : public RefCounted<ArrayBuffer> {
public:
static inline PassRefPtr<ArrayBuffer> create(unsigned numElements, unsigned elementByteSize);
static inline PassRefPtr<ArrayBuffer> create(ArrayBuffer*);
static inline PassRefPtr<ArrayBuffer> create(const void* source, unsigned byteLength);
static inline PassRefPtr<ArrayBuffer> create(ArrayBufferContents&);
// Only for use by Uint8ClampedArray::createUninitialized and SharedBuffer::getAsArrayBuffer.
static inline PassRefPtr<ArrayBuffer> createUninitialized(unsigned numElements, unsigned elementByteSize);
inline void* data();
inline const void* data() const;
inline unsigned byteLength() const;
// Creates a new ArrayBuffer object with copy of bytes in this object
// ranging from |begin| upto but not including |end|.
inline PassRefPtr<ArrayBuffer> slice(int begin, int end) const;
inline PassRefPtr<ArrayBuffer> slice(int begin) const;
void addView(ArrayBufferView*);
void removeView(ArrayBufferView*);
bool transfer(ArrayBufferContents&, Vector<RefPtr<ArrayBufferView> >& neuteredViews);
bool isNeutered() { return m_isNeutered; }
void setDeallocationObserver(ArrayBufferDeallocationObserver* observer) { m_contents.setDeallocationObserver(observer); }
~ArrayBuffer() { }
private:
static inline PassRefPtr<ArrayBuffer> create(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy);
inline ArrayBuffer(ArrayBufferContents&);
inline PassRefPtr<ArrayBuffer> sliceImpl(unsigned begin, unsigned end) const;
inline unsigned clampIndex(int index) const;
static inline int clampValue(int x, int left, int right);
ArrayBufferContents m_contents;
ArrayBufferView* m_firstView;
bool m_isNeutered;
};
int ArrayBuffer::clampValue(int x, int left, int right)
{
ASSERT(left <= right);
if (x < left)
x = left;
if (right < x)
x = right;
return x;
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(unsigned numElements, unsigned elementByteSize)
{
return create(numElements, elementByteSize, ArrayBufferContents::ZeroInitialize);
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(ArrayBuffer* other)
{
return ArrayBuffer::create(other->data(), other->byteLength());
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(const void* source, unsigned byteLength)
{
ArrayBufferContents contents(byteLength, 1, ArrayBufferContents::ZeroInitialize);
if (!contents.data())
return 0;
RefPtr<ArrayBuffer> buffer = adoptRef(new ArrayBuffer(contents));
memcpy(buffer->data(), source, byteLength);
return buffer.release();
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(ArrayBufferContents& contents)
{
return adoptRef(new ArrayBuffer(contents));
}
PassRefPtr<ArrayBuffer> ArrayBuffer::createUninitialized(unsigned numElements, unsigned elementByteSize)
{
return create(numElements, elementByteSize, ArrayBufferContents::DontInitialize);
}
PassRefPtr<ArrayBuffer> ArrayBuffer::create(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy policy)
{
ArrayBufferContents contents(numElements, elementByteSize, policy);
if (!contents.data())
return 0;
return adoptRef(new ArrayBuffer(contents));
}
ArrayBuffer::ArrayBuffer(ArrayBufferContents& contents)
: m_firstView(0), m_isNeutered(false)
{
contents.transfer(m_contents);
}
void* ArrayBuffer::data()
{
return m_contents.data();
}
const void* ArrayBuffer::data() const
{
return m_contents.data();
}
unsigned ArrayBuffer::byteLength() const
{
return m_contents.sizeInBytes();
}
PassRefPtr<ArrayBuffer> ArrayBuffer::slice(int begin, int end) const
{
return sliceImpl(clampIndex(begin), clampIndex(end));
}
PassRefPtr<ArrayBuffer> ArrayBuffer::slice(int begin) const
{
return sliceImpl(clampIndex(begin), byteLength());
}
PassRefPtr<ArrayBuffer> ArrayBuffer::sliceImpl(unsigned begin, unsigned end) const
{
unsigned size = begin <= end ? end - begin : 0;
return ArrayBuffer::create(static_cast<const char*>(data()) + begin, size);
}
unsigned ArrayBuffer::clampIndex(int index) const
{
unsigned currentLength = byteLength();
if (index < 0)
index = currentLength + index;
return clampValue(index, 0, currentLength);
}
} // namespace WTF
using WTF::ArrayBuffer;
#endif // ArrayBuffer_h
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