1/*
2 * Copyright (C) 2008 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
14 *     its contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "config.h"
30#include "ImageData.h"
31
32namespace WebCore {
33
34PassRefPtr<ImageData> ImageData::create(const IntSize& size)
35{
36    Checked<int, RecordOverflow> dataSize = 4;
37    dataSize *= size.width();
38    dataSize *= size.height();
39    if (dataSize.hasOverflowed())
40        return 0;
41
42    return adoptRef(new ImageData(size));
43}
44
45PassRefPtr<ImageData> ImageData::create(const IntSize& size, PassRefPtr<Uint8ClampedArray> byteArray)
46{
47    Checked<int, RecordOverflow> dataSize = 4;
48    dataSize *= size.width();
49    dataSize *= size.height();
50    if (dataSize.hasOverflowed())
51        return 0;
52
53    if (dataSize.unsafeGet() < 0
54        || static_cast<unsigned>(dataSize.unsafeGet()) > byteArray->length())
55        return 0;
56
57    return adoptRef(new ImageData(size, byteArray));
58}
59
60ImageData::ImageData(const IntSize& size)
61    : m_size(size)
62    , m_data(Uint8ClampedArray::createUninitialized(size.width() * size.height() * 4))
63{
64}
65
66ImageData::ImageData(const IntSize& size, PassRefPtr<Uint8ClampedArray> byteArray)
67    : m_size(size)
68    , m_data(byteArray)
69{
70    ASSERT_WITH_SECURITY_IMPLICATION(static_cast<unsigned>(size.width() * size.height() * 4) <= m_data->length());
71}
72
73}
74
75