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 "ArrayBuffer.h"

    31 

    32 #include <wtf/RefPtr.h>

    33 

    34 namespace WebCore {

    35 

    36 PassRefPtr<ArrayBuffer> ArrayBuffer::create(unsigned numElements, unsigned elementByteSize)

    37 {

    38     void* data = tryAllocate(numElements, elementByteSize);

    39     if (!data)

    40         return 0;

    41     return adoptRef(new ArrayBuffer(data, numElements * elementByteSize));

    42 }

    43 

    44 PassRefPtr<ArrayBuffer> ArrayBuffer::create(ArrayBuffer* other)

    45 {

    46     void* data = tryAllocate(other->byteLength(), 1);

    47     if (!data)

    48         return 0;

    49     RefPtr<ArrayBuffer> buffer = adoptRef(new ArrayBuffer(data, other->byteLength()));

    50     memcpy(buffer->data(), other->data(), other->byteLength());

    51     return buffer.release();

    52 }

    53 

    54 ArrayBuffer::ArrayBuffer(void* data, unsigned sizeInBytes)

    55     : m_sizeInBytes(sizeInBytes)

    56     , m_data(data) {

    57 }

    58 

    59 void* ArrayBuffer::data() {

    60     return m_data;

    61 }

    62 

    63 const void* ArrayBuffer::data() const {

    64     return m_data;

    65 }

    66 

    67 unsigned ArrayBuffer::byteLength() const {

    68     return m_sizeInBytes;

    69 }

    70 

    71 ArrayBuffer::~ArrayBuffer() {

    72     WTF::fastFree(m_data);

    73 }

    74 

    75 void* ArrayBuffer::tryAllocate(unsigned numElements, unsigned elementByteSize) {

    76     void* result;

    77     // Do not allow 32-bit overflow of the total size

    78     if (numElements) {

    79         unsigned totalSize = numElements * elementByteSize;

    80         if (totalSize / numElements != elementByteSize)

    81             return 0;

    82     }

    83     if (WTF::tryFastCalloc(numElements, elementByteSize).getValue(result))

    84         return result;

    85     return 0;

    86 }

    87 

    88 }

    89 

    90 #endif // ENABLE(3D_CANVAS)