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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef FlexibleArrayBufferView_h
#define FlexibleArrayBufferView_h
#include "core/CoreExport.h"
#include "core/dom/DOMArrayBufferView.h"
#include "platform/heap/Handle.h"
#include "wtf/Noncopyable.h"
namespace blink {
class CORE_EXPORT FlexibleArrayBufferView {
STACK_ALLOCATED();
WTF_MAKE_NONCOPYABLE(FlexibleArrayBufferView);
public:
FlexibleArrayBufferView() : m_smallData(nullptr), m_smallLength(0) {}
void setFull(DOMArrayBufferView* full) { m_full = full; }
void setSmall(void* data, size_t length) {
m_smallData = data;
m_smallLength = length;
}
void clear() {
m_full = nullptr;
m_smallData = nullptr;
m_smallLength = 0;
}
bool isEmpty() const { return !m_full && !m_smallData; }
bool isFull() const { return m_full; }
DOMArrayBufferView* full() const {
DCHECK(isFull());
return m_full;
}
// WARNING: The pointer returned by baseAddressMaybeOnStack() may point to
// temporary storage that is only valid during the life-time of the
// FlexibleArrayBufferView object.
void* baseAddressMaybeOnStack() const {
DCHECK(!isEmpty());
return isFull() ? m_full->baseAddress() : m_smallData;
}
unsigned byteOffset() const {
DCHECK(!isEmpty());
return isFull() ? m_full->byteOffset() : 0;
}
unsigned byteLength() const {
DCHECK(!isEmpty());
return isFull() ? m_full->byteLength() : m_smallLength;
}
operator bool() const { return !isEmpty(); }
private:
Member<DOMArrayBufferView> m_full;
void* m_smallData;
size_t m_smallLength;
};
} // namespace blink
#endif // FlexibleArrayBufferView_h
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