/*

 * 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 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 JSByteArray_h

#define JSByteArray_h

#include "JSObject.h"

#include <wtf/ByteArray.h>

namespace JSC {

    class JSByteArray : public JSObject {

        friend class JSGlobalData;

    public:

        bool canAccessIndex(unsigned i) { return i < m_storage->length(); }

        JSValue getIndex(ExecState* exec, unsigned i)

        {

            ASSERT(canAccessIndex(i));

            return jsNumber(exec, m_storage->data()[i]);

        }

        void setIndex(unsigned i, int value)

        {

            ASSERT(canAccessIndex(i));

            if (value & ~0xFF) {

                if (value < 0)

                    value = 0;

                else

                    value = 255;

            }

            m_storage->data()[i] = static_cast<unsigned char>(value);

        }

        void setIndex(unsigned i, double value)

        {

            ASSERT(canAccessIndex(i));

            if (!(value > 0)) // Clamp NaN to 0

                value = 0;

            else if (value > 255)

                value = 255;

            m_storage->data()[i] = static_cast<unsigned char>(value + 0.5);

        }

        void setIndex(ExecState* exec, unsigned i, JSValue value)

        {

            double byteValue = value.toNumber(exec);

            if (exec->hadException())

                return;

            if (canAccessIndex(i))

                setIndex(i, byteValue);

        }

        JSByteArray(ExecState* exec, NonNullPassRefPtr<Structure>, WTF::ByteArray* storage, const JSC::ClassInfo* = &s_defaultInfo);

        static PassRefPtr<Structure> createStructure(JSValue prototype);

        virtual bool getOwnPropertySlot(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::PropertySlot&);

        virtual bool getOwnPropertySlot(JSC::ExecState*, unsigned propertyName, JSC::PropertySlot&);

        virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);

        virtual void put(JSC::ExecState*, const JSC::Identifier& propertyName, JSC::JSValue, JSC::PutPropertySlot&);

        virtual void put(JSC::ExecState*, unsigned propertyName, JSC::JSValue);

        virtual void getOwnPropertyNames(JSC::ExecState*, JSC::PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties);

        virtual const ClassInfo* classInfo() const { return m_classInfo; }

        static const ClassInfo s_defaultInfo;

        size_t length() const { return m_storage->length(); }

        WTF::ByteArray* storage() const { return m_storage.get(); }

#if !ASSERT_DISABLED

        virtual ~JSByteArray();

#endif

    protected:

        static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesGetPropertyNames | JSObject::StructureFlags;

    private:

        enum VPtrStealingHackType { VPtrStealingHack };

        JSByteArray(VPtrStealingHackType) 

            : JSObject(createStructure(jsNull()))

            , m_classInfo(0)

        {

        }

        RefPtr<WTF::ByteArray> m_storage;

        const ClassInfo* m_classInfo;

    };

    JSByteArray* asByteArray(JSValue value);

    inline JSByteArray* asByteArray(JSValue value)

    {

        return static_cast<JSByteArray*>(asCell(value));

    }

    inline bool isJSByteArray(JSGlobalData* globalData, JSValue v) { return v.isCell() && v.asCell()->vptr() == globalData->jsByteArrayVPtr; }

} // namespace JSC

#endif // JSByteArray_h