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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 "wtf/typed_arrays/ArrayBuffer.h" | |
27 | |
28 #include "wtf/RefPtr.h" | |
29 #include "wtf/typed_arrays/ArrayBufferView.h" | |
30 | |
31 namespace WTF { | |
32 | |
33 bool ArrayBuffer::transfer(ArrayBufferContents& result) { | |
34 DCHECK(!isShared()); | |
35 RefPtr<ArrayBuffer> keepAlive(this); | |
36 | |
37 if (!m_contents.data()) { | |
38 result.neuter(); | |
39 return false; | |
40 } | |
41 | |
42 bool allViewsAreNeuterable = true; | |
43 for (ArrayBufferView* i = m_firstView; i; i = i->m_nextView) { | |
44 if (!i->isNeuterable()) | |
45 allViewsAreNeuterable = false; | |
46 } | |
47 | |
48 if (allViewsAreNeuterable) { | |
49 m_contents.transfer(result); | |
50 } else { | |
51 m_contents.copyTo(result); | |
52 if (!result.data()) | |
53 return false; | |
54 } | |
55 | |
56 while (m_firstView) { | |
57 ArrayBufferView* current = m_firstView; | |
58 removeView(current); | |
59 if (allViewsAreNeuterable || current->isNeuterable()) | |
60 current->neuter(); | |
61 } | |
62 | |
63 m_isNeutered = true; | |
64 | |
65 return true; | |
66 } | |
67 | |
68 bool ArrayBuffer::shareContentsWith(ArrayBufferContents& result) { | |
69 DCHECK(isShared()); | |
70 RefPtr<ArrayBuffer> keepAlive(this); | |
71 | |
72 if (!m_contents.dataShared()) { | |
73 result.neuter(); | |
74 return false; | |
75 } | |
76 | |
77 m_contents.shareWith(result); | |
78 return true; | |
79 } | |
80 | |
81 void ArrayBuffer::addView(ArrayBufferView* view) { | |
82 view->m_buffer = this; | |
83 view->m_prevView = 0; | |
84 view->m_nextView = m_firstView; | |
85 if (m_firstView) | |
86 m_firstView->m_prevView = view; | |
87 m_firstView = view; | |
88 } | |
89 | |
90 void ArrayBuffer::removeView(ArrayBufferView* view) { | |
91 DCHECK_EQ(this, view->m_buffer.get()); | |
92 if (view->m_nextView) | |
93 view->m_nextView->m_prevView = view->m_prevView; | |
94 if (view->m_prevView) | |
95 view->m_prevView->m_nextView = view->m_nextView; | |
96 if (m_firstView == view) | |
97 m_firstView = view->m_nextView; | |
98 view->m_prevView = view->m_nextView = 0; | |
99 } | |
100 | |
101 } // namespace WTF | |
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