1/*
2 * Copyright (C) 2008-2016 Apple Inc. All rights reserved.
3 * Copyright (C) 2014 Adobe Systems Incorporated. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of Apple Inc. ("Apple") nor the names of
15 * its contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
19 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30#include "config.h"
31#include "ImageData.h"
32
33#include <JavaScriptCore/JSCInlines.h>
34#include <JavaScriptCore/TypedArrayInlines.h>
35
36namespace WebCore {
37
38ExceptionOr<Ref<ImageData>> ImageData::create(unsigned sw, unsigned sh)
39{
40 if (!sw || !sh)
41 return Exception { IndexSizeError };
42
43 Checked<int, RecordOverflow> dataSize = 4;
44 dataSize *= sw;
45 dataSize *= sh;
46 if (dataSize.hasOverflowed())
47 return Exception { RangeError, "Cannot allocate a buffer of this size"_s };
48
49 IntSize size(sw, sh);
50 auto data = adoptRef(*new ImageData(size));
51 data->data()->zeroFill();
52 return data;
53}
54
55RefPtr<ImageData> ImageData::create(const IntSize& size)
56{
57 Checked<int, RecordOverflow> dataSize = 4;
58 dataSize *= size.width();
59 dataSize *= size.height();
60 if (dataSize.hasOverflowed())
61 return nullptr;
62
63 return adoptRef(*new ImageData(size));
64}
65
66RefPtr<ImageData> ImageData::create(const IntSize& size, Ref<Uint8ClampedArray>&& byteArray)
67{
68 Checked<int, RecordOverflow> dataSize = 4;
69 dataSize *= size.width();
70 dataSize *= size.height();
71 if (dataSize.hasOverflowed())
72 return nullptr;
73
74 if (dataSize.unsafeGet() < 0 || static_cast<unsigned>(dataSize.unsafeGet()) > byteArray->length())
75 return nullptr;
76
77 return adoptRef(*new ImageData(size, WTFMove(byteArray)));
78}
79
80ExceptionOr<RefPtr<ImageData>> ImageData::create(Ref<Uint8ClampedArray>&& byteArray, unsigned sw, Optional<unsigned> sh)
81{
82 unsigned length = byteArray->length();
83 if (!length || length % 4)
84 return Exception { InvalidStateError, "Length is not a non-zero multiple of 4"_s };
85
86 ASSERT(length > 0);
87 length /= 4;
88 if (!sw || length % sw)
89 return Exception { IndexSizeError, "Length is not a multiple of sw"_s };
90
91 unsigned height = length / sw;
92 if (sh && sh.value() != height)
93 return Exception { IndexSizeError, "sh value is not equal to height"_s };
94
95 return create(IntSize(sw, height), WTFMove(byteArray));
96}
97
98ImageData::ImageData(const IntSize& size)
99 : m_size(size)
100 , m_data(Uint8ClampedArray::createUninitialized((size.area() * 4).unsafeGet()))
101{
102}
103
104ImageData::ImageData(const IntSize& size, Ref<Uint8ClampedArray>&& byteArray)
105 : m_size(size)
106 , m_data(WTFMove(byteArray))
107{
108 RELEASE_ASSERT_WITH_SECURITY_IMPLICATION((size.area() * 4).unsafeGet() <= m_data->length());
109}
110
111}
112
113