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      1 /*
      2  * Copyright (C) 2010 Google 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  *
      8  * 1.  Redistributions of source code must retain the above copyright
      9  *     notice, this list of conditions and the following disclaimer.
     10  * 2.  Redistributions in binary form must reproduce the above copyright
     11  *     notice, this list of conditions and the following disclaimer in the
     12  *     documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     16  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     17  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     18  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     19  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     20  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     21  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef DataView_h
     27 #define DataView_h
     28 
     29 #include "bindings/v8/ScriptWrappable.h"
     30 #include "wtf/ArrayBufferView.h"
     31 #include "wtf/PassRefPtr.h"
     32 
     33 namespace WebCore {
     34 
     35 class ExceptionState;
     36 
     37 class DataView : public ArrayBufferView, public ScriptWrappable {
     38 public:
     39     static PassRefPtr<DataView> create(unsigned length);
     40     static PassRefPtr<DataView> create(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned byteLength);
     41 
     42     virtual unsigned length() const { return m_byteLength; }
     43     virtual unsigned byteLength() const { return m_byteLength; }
     44     virtual PassRefPtr<ArrayBufferView> slice(int, int) const { return 0; }
     45 
     46     int8_t getInt8(unsigned byteOffset, ExceptionState&);
     47     uint8_t getUint8(unsigned byteOffset, ExceptionState&);
     48     int16_t getInt16(unsigned byteOffset, ExceptionState& ec) { return getInt16(byteOffset, false, ec); }
     49     int16_t getInt16(unsigned byteOffset, bool littleEndian, ExceptionState&);
     50     uint16_t getUint16(unsigned byteOffset, ExceptionState& ec) { return getUint16(byteOffset, false, ec); }
     51     uint16_t getUint16(unsigned byteOffset, bool littleEndian, ExceptionState&);
     52     int32_t getInt32(unsigned byteOffset, ExceptionState& ec) { return getInt32(byteOffset, false, ec); }
     53     int32_t getInt32(unsigned byteOffset, bool littleEndian, ExceptionState&);
     54     uint32_t getUint32(unsigned byteOffset, ExceptionState& ec) { return getUint32(byteOffset, false, ec); }
     55     uint32_t getUint32(unsigned byteOffset, bool littleEndian, ExceptionState&);
     56     float getFloat32(unsigned byteOffset, ExceptionState& ec) { return getFloat32(byteOffset, false, ec); }
     57     float getFloat32(unsigned byteOffset, bool littleEndian, ExceptionState&);
     58     double getFloat64(unsigned byteOffset, ExceptionState& ec) { return getFloat64(byteOffset, false, ec); }
     59     double getFloat64(unsigned byteOffset, bool littleEndian, ExceptionState&);
     60 
     61     void setInt8(unsigned byteOffset, int8_t value, ExceptionState&);
     62     void setUint8(unsigned byteOffset, uint8_t value, ExceptionState&);
     63     void setInt16(unsigned byteOffset, int16_t value, ExceptionState& ec) { setInt16(byteOffset, value, false, ec); }
     64     void setInt16(unsigned byteOffset, int16_t value, bool littleEndian, ExceptionState&);
     65     void setUint16(unsigned byteOffset, uint16_t value, ExceptionState& ec) { setUint16(byteOffset, value, false, ec); }
     66     void setUint16(unsigned byteOffset, uint16_t value, bool littleEndian, ExceptionState&);
     67     void setInt32(unsigned byteOffset, int32_t value, ExceptionState& ec) { setInt32(byteOffset, value, false, ec); }
     68     void setInt32(unsigned byteOffset, int32_t value, bool littleEndian, ExceptionState&);
     69     void setUint32(unsigned byteOffset, uint32_t value, ExceptionState& ec) { setUint32(byteOffset, value, false, ec); }
     70     void setUint32(unsigned byteOffset, uint32_t value, bool littleEndian, ExceptionState&);
     71     void setFloat32(unsigned byteOffset, float value, ExceptionState& ec) { setFloat32(byteOffset, value, false, ec); }
     72     void setFloat32(unsigned byteOffset, float value, bool littleEndian, ExceptionState&);
     73     void setFloat64(unsigned byteOffset, double value, ExceptionState& ec) { setFloat64(byteOffset, value, false, ec); }
     74     void setFloat64(unsigned byteOffset, double value, bool littleEndian, ExceptionState&);
     75 
     76     virtual ViewType getType() const
     77     {
     78         return TypeDataView;
     79     }
     80 
     81 protected:
     82     virtual void neuter();
     83 
     84 private:
     85     DataView(PassRefPtr<ArrayBuffer>, unsigned byteOffset, unsigned byteLength);
     86 
     87     template<typename T>
     88     inline bool beyondRange(unsigned byteOffset) const { return byteOffset >= m_byteLength || byteOffset + sizeof(T) > m_byteLength; }
     89 
     90     template<typename T>
     91     T getData(unsigned byteOffset, bool littleEndian, ExceptionState&) const;
     92 
     93     template<typename T>
     94     void setData(unsigned byteOffset, T value, bool littleEndian, ExceptionState&);
     95 
     96     unsigned m_byteLength;
     97 };
     98 
     99 
    100 } // namespace WebCore
    101 
    102 #endif // DataView_h
    103