| /* |
| * Copyright (C) 2009 Apple Inc. All rights reserved. |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "wtf/ArrayBufferContents.h" |
| |
| #include "wtf/ArrayBufferDeallocationObserver.h" |
| |
| namespace WTF { |
| |
| ArrayBufferContents::ArrayBufferContents() |
| : m_data(0) |
| , m_sizeInBytes(0) |
| , m_deallocationObserver(0) { } |
| |
| ArrayBufferContents::ArrayBufferContents(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy policy) |
| : m_data(0) |
| , m_sizeInBytes(0) |
| , m_deallocationObserver(0) |
| { |
| // Do not allow 32-bit overflow of the total size. |
| // FIXME: Why not? The tryFastCalloc function already checks its arguments, |
| // and will fail if there is any overflow, so why should we include a |
| // redudant unnecessarily restrictive check here? |
| if (numElements) { |
| unsigned totalSize = numElements * elementByteSize; |
| if (totalSize / numElements != elementByteSize) { |
| m_data = 0; |
| return; |
| } |
| } |
| bool allocationSucceeded = false; |
| if (policy == ZeroInitialize) |
| allocationSucceeded = WTF::tryFastCalloc(numElements, elementByteSize).getValue(m_data); |
| else { |
| ASSERT(policy == DontInitialize); |
| allocationSucceeded = WTF::tryFastMalloc(numElements * elementByteSize).getValue(m_data); |
| } |
| |
| if (allocationSucceeded) { |
| m_sizeInBytes = numElements * elementByteSize; |
| return; |
| } |
| m_data = 0; |
| } |
| |
| ArrayBufferContents::~ArrayBufferContents() |
| { |
| WTF::fastFree(m_data); |
| clear(); |
| } |
| |
| void ArrayBufferContents::clear() |
| { |
| if (m_data && m_deallocationObserver) |
| m_deallocationObserver->ArrayBufferDeallocated(m_sizeInBytes); |
| m_data = 0; |
| m_sizeInBytes = 0; |
| m_deallocationObserver = 0; |
| } |
| |
| void ArrayBufferContents::transfer(ArrayBufferContents& other) |
| { |
| ASSERT(!other.m_data); |
| other.m_data = m_data; |
| other.m_sizeInBytes = m_sizeInBytes; |
| clear(); |
| } |
| |
| } // namespace WTF |