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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 | |
36 namespace WTF { | |
37 | |
38 template <typename CharType> | |
39 class StringBuffer { | |
40 WTF_MAKE_NONCOPYABLE(StringBuffer); | |
41 public: | |
42 explicit StringBuffer(unsigned length) | |
43 : m_length(length) | |
44 { | |
45 RELEASE_ASSERT(m_length <= std::numeric_limits<unsigned>::max() / sizeof
(CharType)); | |
46 m_data = static_cast<CharType*>(fastMalloc(m_length * sizeof(CharType)))
; | |
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 RELEASE_ASSERT(newLength <= std::numeric_limits<unsigned>::max() / s
izeof(UChar)); | |
64 m_data = static_cast<UChar*>(fastRealloc(m_data, newLength * sizeof(
UChar))); | |
65 } | |
66 m_length = newLength; | |
67 } | |
68 | |
69 unsigned length() const { return m_length; } | |
70 CharType* characters() { return m_data; } | |
71 | |
72 CharType& operator[](unsigned i) { ASSERT_WITH_SECURITY_IMPLICATION(i < m_le
ngth); return m_data[i]; } | |
73 | |
74 CharType* release() { CharType* data = m_data; m_data = 0; return data; } | |
75 | |
76 private: | |
77 unsigned m_length; | |
78 CharType* m_data; | |
79 }; | |
80 | |
81 } // namespace WTF | |
82 | |
83 using WTF::StringBuffer; | |
84 | |
85 #endif // StringBuffer_h | |
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