1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
* Copyright (C) 2012 Sony Mobile Communications AB
*
* 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 ArrayBufferView_h
#define ArrayBufferView_h
#include "ArrayBuffer.h"
#include "ExceptionCode.h"
#include <algorithm>
#include <limits.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class ArrayBufferView : public RefCounted<ArrayBufferView> {
public:
virtual bool isByteArray() const { return false; }
virtual bool isUnsignedByteArray() const { return false; }
virtual bool isUnsignedByteClampedArray() const { return false; }
virtual bool isShortArray() const { return false; }
virtual bool isUnsignedShortArray() const { return false; }
virtual bool isIntArray() const { return false; }
virtual bool isUnsignedIntArray() const { return false; }
virtual bool isFloatArray() const { return false; }
virtual bool isDoubleArray() const { return false; }
virtual bool isDataView() const { return false; }
PassRefPtr<ArrayBuffer> buffer() const
{
return m_buffer;
}
void* baseAddress() const
{
return m_baseAddress;
}
unsigned byteOffset() const
{
return m_byteOffset;
}
virtual unsigned byteLength() const = 0;
virtual ~ArrayBufferView();
protected:
ArrayBufferView(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset);
void setImpl(ArrayBufferView* array, unsigned byteOffset, ExceptionCode& ec);
void setRangeImpl(const char* data, size_t dataByteLength, unsigned byteOffset, ExceptionCode& ec);
void zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength, ExceptionCode& ec);
static void calculateOffsetAndLength(int start, int end, unsigned arraySize,
unsigned* offset, unsigned* length);
// Helper to verify that a given sub-range of an ArrayBuffer is
// within range.
template <typename T>
static bool verifySubRange(PassRefPtr<ArrayBuffer> buffer,
unsigned byteOffset,
unsigned numElements)
{
if (!buffer)
return false;
if (sizeof(T) > 1 && byteOffset % sizeof(T))
return false;
if (byteOffset > buffer->byteLength())
return false;
unsigned remainingElements = (buffer->byteLength() - byteOffset) / sizeof(T);
if (numElements > remainingElements)
return false;
return true;
}
// Input offset is in number of elements from this array's view;
// output offset is in number of bytes from the underlying buffer's view.
template <typename T>
static void clampOffsetAndNumElements(PassRefPtr<ArrayBuffer> buffer,
unsigned arrayByteOffset,
unsigned *offset,
unsigned *numElements)
{
unsigned maxOffset = (UINT_MAX - arrayByteOffset) / sizeof(T);
if (*offset > maxOffset) {
*offset = buffer->byteLength();
*numElements = 0;
return;
}
*offset = arrayByteOffset + *offset * sizeof(T);
*offset = std::min(buffer->byteLength(), *offset);
unsigned remainingElements = (buffer->byteLength() - *offset) / sizeof(T);
*numElements = std::min(remainingElements, *numElements);
}
// This is the address of the ArrayBuffer's storage, plus the byte offset.
void* m_baseAddress;
unsigned m_byteOffset;
private:
RefPtr<ArrayBuffer> m_buffer;
};
} // namespace WebCore
#endif // ArrayBufferView_h
|
