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