1/*
2 * Copyright (C) 2003, 2006, 2008, 2009, 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 * 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 COMPUTER, 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 COMPUTER, 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 CString_h
27#define CString_h
28
29#include "PassRefPtr.h"
30#include "RefCounted.h"
31#include "Vector.h"
32
33namespace WTF {
34
35class CStringBuffer : public RefCounted<CStringBuffer> {
36public:
37    const char* data() { return m_vector.data(); }
38    size_t length() { return m_vector.size(); }
39
40private:
41    friend class CString;
42
43    static PassRefPtr<CStringBuffer> create(size_t length) { return adoptRef(new CStringBuffer(length)); }
44    CStringBuffer(size_t length) : m_vector(length) { }
45    char* mutableData() { return m_vector.data(); }
46
47    Vector<char> m_vector;
48};
49
50// A container for a null-terminated char array supporting copy-on-write
51// assignment.  The contained char array may be null.
52class CString {
53public:
54    CString() { }
55    CString(const char*);
56    CString(const char*, size_t length);
57    CString(CStringBuffer* buffer) : m_buffer(buffer) { }
58    static CString newUninitialized(size_t length, char*& characterBuffer);
59
60    const char* data() const
61    {
62        return m_buffer ? m_buffer->data() : 0;
63    }
64    char* mutableData();
65    size_t length() const
66    {
67        return m_buffer ? m_buffer->length() - 1 : 0;
68    }
69
70    bool isNull() const { return !m_buffer; }
71
72    CStringBuffer* buffer() const { return m_buffer.get(); }
73
74private:
75    void copyBufferIfNeeded();
76    void init(const char*, size_t length);
77    RefPtr<CStringBuffer> m_buffer;
78};
79
80bool operator==(const CString& a, const CString& b);
81inline bool operator!=(const CString& a, const CString& b) { return !(a == b); }
82
83} // namespace WTF
84
85using WTF::CString;
86
87#endif // CString_h
88