text: /*
   * 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:
      typedef T ValueType;
  
      T* data() const { return static_cast<T*>(baseAddress()); }
  
      bool set(TypedArrayBase<T>* array, unsigned offset)
      {
          return setImpl(array, offset * 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;
      }
  
      unsigned byteLength() const final
      {
          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_WITH_SECURITY_IMPLICATION(index < TypedArrayBase<T>::m_length);
          return TypedArrayBase<T>::data()[index];
      }
  
  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));
          return create<Subclass>(buffer.release(), 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);
          RELEASE_ASSERT(verifySubRange<T>(buf, byteOffset, length));
          return adoptRef(new Subclass(buf.release(), byteOffset, length));
      }
  
      template <class Subclass>
      static PassRefPtr<Subclass> createOrNull(unsigned length)
      {
          RefPtr<ArrayBuffer> buffer = ArrayBuffer::createOrNull(length, sizeof(T));
          if (!buffer)
              return nullptr;
          return create<Subclass>(buffer.release(), 0, length);
      }
  
      void neuter() final
      {
          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
  