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