JSDataView.h 2.74 KB
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/*
 * Copyright (C) 2013 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 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 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 JSDataView_h
#define JSDataView_h

#include "DataView.h"
#include "JSArrayBufferView.h"

namespace JSC {

class JSDataView : public JSArrayBufferView {
public:
    typedef JSArrayBufferView Base;
    static const unsigned elementSize = 1;
    
protected:
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    JSDataView(VM&, ConstructionContext&, ArrayBuffer*);
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public:
    static JSDataView* create(
        ExecState*, Structure*, PassRefPtr<ArrayBuffer>, unsigned byteOffset,
        unsigned byteLength);
    
    // Dummy methods, which don't actually work; these are just in place to
    // placate some template specialization we do elsewhere.
    static JSDataView* createUninitialized(ExecState*, Structure*, unsigned length);
    static JSDataView* create(ExecState*, Structure*, unsigned length);
    bool set(ExecState*, JSObject*, unsigned offset, unsigned length);
    
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    ArrayBuffer* buffer() const { return m_buffer; }
    
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    PassRefPtr<DataView> typedImpl();
    
    static const TypedArrayType TypedArrayStorageType = TypeDataView;

protected:
    static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);

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    static ArrayBuffer* slowDownAndWasteMemory(JSArrayBufferView*);
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    static PassRefPtr<ArrayBufferView> getTypedArrayImpl(JSArrayBufferView*);
    
public:
    static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
    
    DECLARE_EXPORT_INFO;
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private:
    ArrayBuffer* m_buffer;
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};

} // namespace JSC

#endif // JSDataView_h