• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 class StringBuffer {
39     WTF_MAKE_NONCOPYABLE(StringBuffer);
40 public:
StringBuffer(unsigned length)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 
~StringBuffer()49     ~StringBuffer()
50     {
51         fastFree(m_data);
52     }
53 
shrink(unsigned newLength)54     void shrink(unsigned newLength)
55     {
56         ASSERT(newLength <= m_length);
57         m_length = newLength;
58     }
59 
resize(unsigned newLength)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 
length()70     unsigned length() const { return m_length; }
characters()71     UChar* characters() { return m_data; }
72 
73     UChar& operator[](unsigned i) { ASSERT(i < m_length); return m_data[i]; }
74 
release()75     UChar* release() { UChar* data = m_data; m_data = 0; return data; }
76 
77 private:
78     unsigned m_length;
79     UChar* m_data;
80 };
81 
82 } // namespace WTF
83 
84 using WTF::StringBuffer;
85 
86 #endif // StringBuffer_h
87