1/*
2 * Copyright (C) 2008, 2010 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 *
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 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of its
14 *     contributors may be used to endorse or promote products derived
15 *     from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef StringBuffer_h
30#define StringBuffer_h
31
32#include <wtf/Assertions.h>
33#include <wtf/unicode/Unicode.h>
34#include <limits>
35
36namespace WTF {
37
38class StringBuffer {
39    WTF_MAKE_NONCOPYABLE(StringBuffer);
40public:
41    explicit StringBuffer(unsigned length)
42        : m_length(length)
43    {
44        if (m_length > std::numeric_limits<unsigned>::max() / sizeof(UChar))
45            CRASH();
46        m_data = static_cast<UChar*>(fastMalloc(m_length * sizeof(UChar)));
47    }
48
49    ~StringBuffer()
50    {
51        fastFree(m_data);
52    }
53
54    void shrink(unsigned newLength)
55    {
56        ASSERT(newLength <= m_length);
57        m_length = newLength;
58    }
59
60    void resize(unsigned newLength)
61    {
62        if (newLength > m_length) {
63            if (newLength > std::numeric_limits<unsigned>::max() / sizeof(UChar))
64                CRASH();
65            m_data = static_cast<UChar*>(fastRealloc(m_data, newLength * sizeof(UChar)));
66        }
67        m_length = newLength;
68    }
69
70    unsigned length() const { return m_length; }
71    UChar* characters() { return m_data; }
72
73    UChar& operator[](unsigned i) { ASSERT(i < m_length); return m_data[i]; }
74
75    UChar* release() { UChar* data = m_data; m_data = 0; return data; }
76
77private:
78    unsigned m_length;
79    UChar* m_data;
80};
81
82} // namespace WTF
83
84using WTF::StringBuffer;
85
86#endif // StringBuffer_h
87