runtime/ArrayBufferView.cpp

   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
  29 #include "ArrayBuffer.h"
  30
  31 namespace JSC {
  32
  33 ArrayBufferView::ArrayBufferView(
  34     PassRefPtr<ArrayBuffer> buffer,
  35     unsigned byteOffset)
  36         : m_byteOffset(byteOffset)
  37         , m_isNeuterable(true)
  38         , m_buffer(buffer)
  39 {
  40     m_baseAddress = m_buffer ? (static_cast<char*>(m_buffer->data()) + m_byteOffset) : 0;
  41 }
  42
  43 ArrayBufferView::~ArrayBufferView()
  44 {
  45     if (!m_isNeuterable)
  46         m_buffer->unpin();
  47 }
  48
  49 void ArrayBufferView::setNeuterable(bool flag)
  50 {
  51     if (flag == m_isNeuterable)
  52         return;
  53
  54     m_isNeuterable = flag;
  55
  56     if (!m_buffer)
  57         return;
  58
  59     if (flag)
  60         m_buffer->unpin();
  61     else
  62         m_buffer->pin();
  63 }
  64
  65 } // namespace JSC