1 /*

     2  * Copyright (C) 2009 Apple Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  * 1. Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  * 2. Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 

    24  */

    25 

    26 #include "config.h"

    27 

    28 #if ENABLE(3D_CANVAS)

    29 

    30 #include "ArrayBufferView.h"

    31 #include "ArrayBuffer.h"

    32 

    33 namespace WebCore {

    34 

    35 ArrayBufferView::ArrayBufferView(PassRefPtr<ArrayBuffer> buffer,

    36                        unsigned byteOffset)

    37         : m_byteOffset(byteOffset)

    38         , m_buffer(buffer)

    39 {

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

    41 }

    42 

    43 ArrayBufferView::~ArrayBufferView()

    44 {

    45 }

    46 

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

    48 {

    49     if (byteOffset > byteLength() ||

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

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

    52         // Out of range offset or overflow

    53         ec = INDEX_SIZE_ERR;

    54         return;

    55     }

    56 

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

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

    59 }

    60 

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

    62                                           unsigned* offset, unsigned* length)

    63 {

    64     if (start < 0)

    65         start += arraySize;

    66     if (start < 0)

    67         start = 0;

    68     if (end < 0)

    69         end += arraySize;

    70     if (end < 0)

    71         end = 0;

    72     if (end < start)

    73         end = start;

    74     *offset = static_cast<unsigned>(start);

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

    76 }

    77 

    78 }

    79 

    80 #endif // ENABLE(3D_CANVAS)