1/*
2 * Copyright (C) 2009 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 ByteArray_h
27#define ByteArray_h
28
29#include <limits.h>
30#include <wtf/PassRefPtr.h>
31#include <wtf/Platform.h>
32#include <wtf/RefCounted.h>
33
34namespace WTF {
35    class ByteArray : public RefCountedBase {
36    public:
37        unsigned length() const { return m_size; }
38
39        void set(unsigned index, double value)
40        {
41            if (index >= m_size)
42                return;
43            if (!(value > 0)) // Clamp NaN to 0
44                value = 0;
45            else if (value > 255)
46                value = 255;
47            m_data[index] = static_cast<unsigned char>(value + 0.5);
48        }
49
50        void set(unsigned index, unsigned char value)
51        {
52            if (index >= m_size)
53                return;
54            m_data[index] = value;
55        }
56
57        bool get(unsigned index, unsigned char& result) const
58        {
59            if (index >= m_size)
60                return false;
61            result = m_data[index];
62            return true;
63        }
64
65        unsigned char get(unsigned index) const
66        {
67            ASSERT(index < m_size);
68            return m_data[index];
69        }
70
71        unsigned char* data() { return m_data; }
72
73        void deref()
74        {
75            if (derefBase()) {
76                // We allocated with new unsigned char[] in create(),
77                // and then used placement new to construct the object.
78                this->~ByteArray();
79                delete[] reinterpret_cast<unsigned char*>(this);
80            }
81        }
82
83        static PassRefPtr<ByteArray> create(size_t size);
84
85    private:
86        ByteArray(size_t size)
87            : m_size(size)
88        {
89        }
90        size_t m_size;
91// MSVC can't handle correctly unsized array.
92// warning C4200: nonstandard extension used : zero-sized array in struct/union
93// Cannot generate copy-ctor or copy-assignment operator when UDT contains a zero-sized array
94#if COMPILER(MSVC)
95        unsigned char m_data[INT_MAX];
96#else
97        unsigned char m_data[];
98#endif
99    };
100} // namespace WTF
101
102using WTF::ByteArray;
103
104#endif
105