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/*
* Copyright (C) 2010 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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.
*/
#ifndef AudioArray_h
#define AudioArray_h
#include <string.h>
#include <wtf/CheckedArithmetic.h>
#include <wtf/FastMalloc.h>
namespace WebCore {
template<typename T>
class AudioArray {
WTF_MAKE_FAST_ALLOCATED;
public:
AudioArray() = default;
explicit AudioArray(size_t n)
{
resize(n);
}
~AudioArray()
{
fastAlignedFree(m_allocation);
}
// It's OK to call resize() multiple times, but data will *not* be copied from an initial allocation
// if re-allocated. Allocations are zero-initialized.
void resize(Checked<size_t> n)
{
if (n == m_size)
return;
Checked<size_t> initialSize = sizeof(T) * n;
// Accelerate.framework behaves differently based on input vector alignment. And each implementation
// has very small difference in output! We ensure 32byte alignment so that we will always take the most
// optimized implementation if possible, which makes the result deterministic.
constexpr size_t alignment = 32;
fastAlignedFree(m_allocation);
m_allocation = static_cast<T*>(fastAlignedMalloc(alignment, initialSize));
if (!m_allocation)
CRASH();
m_size = n;
zero();
}
T* data() { return m_allocation; }
const T* data() const { return m_allocation; }
size_t size() const { return m_size; }
bool isEmpty() const { return !m_size; }
T& at(size_t i)
{
// Note that although it is a size_t, m_size is now guaranteed to be
// no greater than max unsigned. This guarantee is enforced in resize().
ASSERT_WITH_SECURITY_IMPLICATION(i < size());
return data()[i];
}
const T& at(size_t i) const
{
// Note that although it is a size_t, m_size is now guaranteed to be
// no greater than max unsigned. This guarantee is enforced in resize().
ASSERT_WITH_SECURITY_IMPLICATION(i < size());
return data()[i];
}
T& operator[](size_t i) { return at(i); }
const T& operator[](size_t i) const { return at(i); }
void zero()
{
// This multiplication is made safe by the check in resize().
memset(this->data(), 0, sizeof(T) * this->size());
}
void zeroRange(unsigned start, unsigned end)
{
bool isSafe = (start <= end) && (end <= this->size());
ASSERT(isSafe);
if (!isSafe)
return;
// This expression cannot overflow because end - start cannot be
// greater than m_size, which is safe due to the check in resize().
memset(this->data() + start, 0, sizeof(T) * (end - start));
}
void copyToRange(const T* sourceData, unsigned start, unsigned end)
{
bool isSafe = (start <= end) && (end <= this->size());
ASSERT(isSafe);
if (!isSafe)
return;
// This expression cannot overflow because end - start cannot be
// greater than m_size, which is safe due to the check in resize().
memcpy(this->data() + start, sourceData, sizeof(T) * (end - start));
}
bool containsConstantValue() const
{
if (m_size <= 1)
return true;
float constant = data()[0];
for (unsigned i = 1; i < m_size; ++i) {
if (data()[i] != constant)
return false;
}
return true;
}
private:
T* m_allocation { nullptr };
size_t m_size { 0 };
};
typedef AudioArray<float> AudioFloatArray;
typedef AudioArray<double> AudioDoubleArray;
} // WebCore
#endif // AudioArray_h
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