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 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 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#include "ArrayBufferView.h"
28#include <wtf/CheckedArithmetic.h>
29
30namespace JSC {
31
32ArrayBufferView::ArrayBufferView(
33 RefPtr<ArrayBuffer>&& buffer, unsigned byteOffset, unsigned byteLength)
34 : m_byteOffset(byteOffset)
35 , m_isNeuterable(true)
36 , m_byteLength(byteLength)
37 , m_buffer(WTFMove(buffer))
38{
39 Checked<unsigned, CrashOnOverflow> length(byteOffset);
40 length += byteLength;
41 RELEASE_ASSERT_WITH_SECURITY_IMPLICATION(length <= m_buffer->byteLength());
42 if (m_buffer)
43 m_baseAddress = BaseAddress(static_cast<char*>(m_buffer->data()) + m_byteOffset, byteLength);
44}
45
46ArrayBufferView::~ArrayBufferView()
47{
48 if (!m_isNeuterable)
49 m_buffer->unpin();
50}
51
52void ArrayBufferView::setNeuterable(bool flag)
53{
54 if (flag == m_isNeuterable)
55 return;
56
57 m_isNeuterable = flag;
58
59 if (!m_buffer)
60 return;
61
62 if (flag)
63 m_buffer->unpin();
64 else
65 m_buffer->pin();
66}
67
68} // namespace JSC
69