| /* |
| * Copyright (C) 2010 Apple Inc. All rights reserved. |
| * 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. |
| * |
| * 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. |
| */ |
| |
| #ifndef TypedArrayBase_h |
| #define TypedArrayBase_h |
| |
| #include <wtf/ArrayBuffer.h> |
| #include <wtf/ArrayBufferView.h> |
| |
| namespace WTF { |
| |
| template <typename T> |
| class TypedArrayBase : public ArrayBufferView { |
| public: |
| T* data() const { return static_cast<T*>(baseAddress()); } |
| |
| bool set(TypedArrayBase<T>* array, unsigned offset) |
| { |
| return setImpl(array, offset * sizeof(T)); |
| } |
| |
| bool setRange(const T* data, size_t dataLength, unsigned offset) |
| { |
| return setRangeImpl(reinterpret_cast<const char*>(data), dataLength * sizeof(T), offset * sizeof(T)); |
| } |
| |
| bool zeroRange(unsigned offset, size_t length) |
| { |
| return zeroRangeImpl(offset * sizeof(T), length * sizeof(T)); |
| } |
| |
| // Overridden from ArrayBufferView. This must be public because of |
| // rules about inheritance of members in template classes, and |
| // because it is accessed via pointers to subclasses. |
| unsigned length() const |
| { |
| return m_length; |
| } |
| |
| virtual unsigned byteLength() const |
| { |
| return m_length * sizeof(T); |
| } |
| |
| // Invoked by the indexed getter. Does not perform range checks; caller |
| // is responsible for doing so and returning undefined as necessary. |
| T item(unsigned index) const |
| { |
| ASSERT(index < TypedArrayBase<T>::m_length); |
| return TypedArrayBase<T>::data()[index]; |
| } |
| |
| bool checkInboundData(unsigned offset, unsigned pos) const |
| { |
| return (offset <= m_length |
| && offset + pos <= m_length |
| // check overflow |
| && offset + pos >= offset); |
| } |
| |
| protected: |
| TypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length) |
| : ArrayBufferView(buffer, byteOffset) |
| , m_length(length) |
| { |
| } |
| |
| template <class Subclass> |
| static PassRefPtr<Subclass> create(unsigned length) |
| { |
| RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, sizeof(T)); |
| if (!buffer.get()) |
| return 0; |
| return create<Subclass>(buffer, 0, length); |
| } |
| |
| template <class Subclass> |
| static PassRefPtr<Subclass> create(const T* array, unsigned length) |
| { |
| RefPtr<Subclass> a = create<Subclass>(length); |
| if (a) |
| for (unsigned i = 0; i < length; ++i) |
| a->set(i, array[i]); |
| return a; |
| } |
| |
| template <class Subclass> |
| static PassRefPtr<Subclass> create(PassRefPtr<ArrayBuffer> buffer, |
| unsigned byteOffset, |
| unsigned length) |
| { |
| RefPtr<ArrayBuffer> buf(buffer); |
| if (!verifySubRange<T>(buf, byteOffset, length)) |
| return 0; |
| |
| return adoptRef(new Subclass(buf, byteOffset, length)); |
| } |
| |
| template <class Subclass> |
| static PassRefPtr<Subclass> createUninitialized(unsigned length) |
| { |
| RefPtr<ArrayBuffer> buffer = ArrayBuffer::createUninitialized(length, sizeof(T)); |
| if (!buffer.get()) |
| return 0; |
| return create<Subclass>(buffer, 0, length); |
| } |
| |
| template <class Subclass> |
| PassRefPtr<Subclass> subarrayImpl(int start, int end) const |
| { |
| unsigned offset, length; |
| calculateOffsetAndLength(start, end, m_length, &offset, &length); |
| clampOffsetAndNumElements<T>(buffer(), m_byteOffset, &offset, &length); |
| return create<Subclass>(buffer(), offset, length); |
| } |
| |
| virtual void neuter() |
| { |
| ArrayBufferView::neuter(); |
| m_length = 0; |
| } |
| |
| // We do not want to have to access this via a virtual function in subclasses, |
| // which is why it is protected rather than private. |
| unsigned m_length; |
| }; |
| |
| } // namespace WTF |
| |
| using WTF::TypedArrayBase; |
| |
| #endif // TypedArrayBase_h |