runtime/JSDataView.h

   1 /*
   2  * Copyright (C) 2013 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef JSDataView_h
  27 #define JSDataView_h
  28
  29 #include "DataView.h"
  30 #include "JSArrayBufferView.h"
  31
  32 namespace JSC {
  33
  34 class JSDataView : public JSArrayBufferView {
  35 public:
  36     typedef JSArrayBufferView Base;
  37     static const unsigned elementSize = 1;
  38
  39 protected:
  40     JSDataView(VM&, ConstructionContext&, ArrayBuffer*);
  41
  42 public:
  43     static JSDataView* create(
  44         ExecState*, Structure*, PassRefPtr<ArrayBuffer>, unsigned byteOffset,
  45         unsigned byteLength);
  46
  47     // Dummy methods, which don't actually work; these are just in place to
  48     // placate some template specialization we do elsewhere.
  49     static JSDataView* createUninitialized(ExecState*, Structure*, unsigned length);
  50     static JSDataView* create(ExecState*, Structure*, unsigned length);
  51     bool set(ExecState*, JSObject*, unsigned offset, unsigned length);
  52
  53     ArrayBuffer* buffer() const { return m_buffer; }
  54
  55     PassRefPtr<DataView> typedImpl();
  56
  57     static const TypedArrayType TypedArrayStorageType = TypeDataView;
  58
  59 protected:
  60     static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
  61
  62     static ArrayBuffer* slowDownAndWasteMemory(JSArrayBufferView*);
  63     static PassRefPtr<ArrayBufferView> getTypedArrayImpl(JSArrayBufferView*);
  64
  65 public:
  66     static Structure* createStructure(VM&, JSGlobalObject*, JSValue prototype);
  67
  68     DECLARE_EXPORT_INFO;
  69
  70 private:
  71     ArrayBuffer* m_buffer;
  72 };
  73
  74 } // namespace JSC
  75
  76 #endif // JSDataView_h
  77