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https://github.com/flutter/flutter.git
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91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
/*
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* Copyright (C) 2009 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "sky/engine/wtf/ArrayBuffer.h"
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#include "sky/engine/wtf/ArrayBufferView.h"
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#include "sky/engine/wtf/RefPtr.h"
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namespace WTF {
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bool ArrayBuffer::transfer(ArrayBufferContents& result)
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{
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RefPtr<ArrayBuffer> keepAlive(this);
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if (!m_contents.data()) {
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result.clear();
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return false;
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}
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bool allViewsAreNeuterable = true;
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for (ArrayBufferView* i = m_firstView; i; i = i->m_nextView) {
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if (!i->isNeuterable())
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allViewsAreNeuterable = false;
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}
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if (allViewsAreNeuterable) {
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m_contents.transfer(result);
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} else {
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m_contents.copyTo(result);
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if (!result.data())
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return false;
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}
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while (m_firstView) {
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ArrayBufferView* current = m_firstView;
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removeView(current);
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if (allViewsAreNeuterable || current->isNeuterable())
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current->neuter();
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}
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m_isNeutered = true;
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return true;
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}
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void ArrayBuffer::addView(ArrayBufferView* view)
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{
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view->m_buffer = this;
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view->m_prevView = 0;
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view->m_nextView = m_firstView;
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if (m_firstView)
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m_firstView->m_prevView = view;
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m_firstView = view;
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}
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void ArrayBuffer::removeView(ArrayBufferView* view)
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{
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ASSERT(this == view->m_buffer);
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if (view->m_nextView)
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view->m_nextView->m_prevView = view->m_prevView;
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if (view->m_prevView)
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view->m_prevView->m_nextView = view->m_nextView;
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if (m_firstView == view)
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m_firstView = view->m_nextView;
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view->m_prevView = view->m_nextView = 0;
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}
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}
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