/*

 * Copyright (C) 2003, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef CString_h

#define CString_h

#include "PassRefPtr.h"

#include "RefCounted.h"

#include "Vector.h"

namespace WTF {

class CStringBuffer : public RefCounted<CStringBuffer> {

public:

    const char* data() { return m_vector.data(); }

    size_t length() { return m_vector.size(); }

private:

    friend class CString;

    static PassRefPtr<CStringBuffer> create(unsigned length) { return adoptRef(new CStringBuffer(length)); }

    CStringBuffer(unsigned length) : m_vector(length) { }

    char* mutableData() { return m_vector.data(); }

    Vector<char> m_vector;

};

// A container for a null-terminated char array supporting copy-on-write

// assignment.  The contained char array may be null.

class CString {

public:

    CString() { }

    CString(const char*);

    CString(const char*, unsigned length);

    CString(CStringBuffer* buffer) : m_buffer(buffer) { }

    static CString newUninitialized(size_t length, char*& characterBuffer);

    const char* data() const

    {

        return m_buffer ? m_buffer->data() : 0;

    }

    char* mutableData();

    unsigned length() const

    {

        return m_buffer ? m_buffer->length() - 1 : 0;

    }

    bool isNull() const { return !m_buffer; }

    CStringBuffer* buffer() const { return m_buffer.get(); }

private:

    void copyBufferIfNeeded();

    void init(const char*, unsigned length);

    RefPtr<CStringBuffer> m_buffer;

};

bool operator==(const CString& a, const CString& b);

inline bool operator!=(const CString& a, const CString& b) { return !(a == b); }

} // namespace WTF

using WTF::CString;

#endif // CString_h