/*

 * 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. 

 */

#include "config.h"

#if ENABLE(3D_CANVAS)

#include "ArrayBufferView.h"

#include "ArrayBuffer.h"

namespace WebCore {

ArrayBufferView::ArrayBufferView(PassRefPtr<ArrayBuffer> buffer,

                       unsigned byteOffset)

        : m_byteOffset(byteOffset)

        , m_buffer(buffer)

{

    m_baseAddress = m_buffer ? (static_cast<char*>(m_buffer->data()) + m_byteOffset) : 0;

}

ArrayBufferView::~ArrayBufferView()

{

}

void ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset, ExceptionCode& ec)

{

    if (byteOffset > byteLength() ||

        byteOffset + array->byteLength() > byteLength() ||

        byteOffset + array->byteLength() < byteOffset) {

        // Out of range offset or overflow

        ec = INDEX_SIZE_ERR;

        return;

    }

    char* base = static_cast<char*>(baseAddress());

    memmove(base + byteOffset, array->baseAddress(), array->byteLength());

}

void ArrayBufferView::calculateOffsetAndLength(int start, int end, unsigned arraySize,

                                          unsigned* offset, unsigned* length)

{

    if (start < 0)

        start += arraySize;

    if (start < 0)

        start = 0;

    if (end < 0)

        end += arraySize;

    if (end < 0)

        end = 0;

    if (end < start)

        end = start;

    *offset = static_cast<unsigned>(start);

    *length = static_cast<unsigned>(end - start);

}

}

#endif // ENABLE(3D_CANVAS)