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
33namespace WebCore {
34
35class ExceptionState;
36
37class DataView : public ArrayBufferView, public ScriptWrappable {
38public:
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
81protected:
82    virtual void neuter();
83
84private:
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