/* * 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) { allocate(n); } ~AudioArray() { fastAlignedFree(m_allocation); } // It's OK to call allocate() multiple times, but data will *not* be copied from an initial allocation // if re-allocated. Allocations are zero-initialized. void allocate(Checked<size_t> n) { Checked<size_t> initialSize = sizeof(T) * n; const size_t alignment = 16; fastAlignedFree(m_allocation); m_allocation = static_cast<T*>(fastAlignedMalloc(alignment, initialSize.unsafeGet())); if (!m_allocation) CRASH(); m_size = n.unsafeGet(); zero(); } T* data() { return m_allocation; } const T* data() const { return m_allocation; } size_t size() 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 allocate(). ASSERT_WITH_SECURITY_IMPLICATION(i < size()); return data()[i]; } T& operator[](size_t i) { return at(i); } void zero() { // This multiplication is made safe by the check in allocate(). 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 allocate(). 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 allocate(). memcpy(this->data() + start, sourceData, sizeof(T) * (end - start)); } private: T* m_allocation { nullptr }; size_t m_size { 0 }; }; typedef AudioArray<float> AudioFloatArray; typedef AudioArray<double> AudioDoubleArray; } // WebCore #endif // AudioArray_h