JavaScriptCore-903.5.tar.gz

[apple/javascriptcore.git] / wtf / text / CString.h

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 *
 * Redistribution and use in source and binary forms, with or without
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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#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(size_t length) { return adoptRef(new CStringBuffer(length)); }
    CStringBuffer(size_t 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*, size_t 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();
    size_t 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*, size_t 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