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/*
* 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 "sky/engine/wtf/ArrayBufferContents.h"
#include <string.h>
#include "sky/engine/wtf/Assertions.h"
#include "sky/engine/wtf/PartitionAlloc.h"
#include "sky/engine/wtf/WTF.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.
if (numElements) {
unsigned totalSize = numElements * elementByteSize;
if (totalSize / numElements != elementByteSize) {
m_data = 0;
return;
}
}
allocateMemory(numElements * elementByteSize, policy, m_data);
m_sizeInBytes = numElements * elementByteSize;
}
ArrayBufferContents::ArrayBufferContents(
void* data, unsigned sizeInBytes, ArrayBufferDeallocationObserver* observer)
: m_data(data)
, m_sizeInBytes(sizeInBytes)
, m_deallocationObserver(observer)
{
if (!m_data) {
ASSERT(!m_sizeInBytes);
m_sizeInBytes = 0;
// Allow null data if size is 0 bytes, make sure m_data is valid pointer.
// (partitionAllocGeneric guarantees valid pointer for size 0)
allocateMemory(0, ZeroInitialize, m_data);
}
}
ArrayBufferContents::~ArrayBufferContents()
{
freeMemory(m_data, m_sizeInBytes);
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();
}
void ArrayBufferContents::copyTo(ArrayBufferContents& other)
{
ASSERT(!other.m_sizeInBytes);
other.freeMemory(other.m_data, other.m_sizeInBytes);
allocateMemory(m_sizeInBytes, DontInitialize, other.m_data);
if (!other.m_data)
return;
memcpy(other.m_data, m_data, m_sizeInBytes);
other.m_sizeInBytes = m_sizeInBytes;
}
void ArrayBufferContents::allocateMemory(size_t size, InitializationPolicy policy, void*& data)
{
data = partitionAllocGenericFlags(WTF::Partitions::getBufferPartition(), PartitionAllocReturnNull, size);
if (policy == ZeroInitialize && data)
memset(data, '\0', size);
}
void ArrayBufferContents::freeMemory(void* data, size_t)
{
partitionFreeGeneric(WTF::Partitions::getBufferPartition(), data);
}
} // namespace WTF