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****************************************************************************/

#ifndef QTEXTCODEC_H

#define QTEXTCODEC_H

#include <QtCore/qstring.h>

#include <QtCore/qlist.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Core)

#ifndef QT_NO_TEXTCODEC

class QTextCodec;

class QIODevice;

class QTextDecoder;

class QTextEncoder;

class Q_CORE_EXPORT QTextCodec

{

    Q_DISABLE_COPY(QTextCodec)

public:

    static QTextCodec* codecForName(const QByteArray &name);

    static QTextCodec* codecForName(const char *name) { return codecForName(QByteArray(name)); }

    static QTextCodec* codecForMib(int mib);

    static QList<QByteArray> availableCodecs();

    static QList<int> availableMibs();

    static QTextCodec* codecForLocale();

    static void setCodecForLocale(QTextCodec *c);

    static QTextCodec* codecForTr();

    static void setCodecForTr(QTextCodec *c);

    static QTextCodec* codecForCStrings();

    static void setCodecForCStrings(QTextCodec *c);

    static QTextCodec *codecForHtml(const QByteArray &ba);

    static QTextCodec *codecForHtml(const QByteArray &ba, QTextCodec *defaultCodec);

    static QTextCodec *codecForUtfText(const QByteArray &ba);

    static QTextCodec *codecForUtfText(const QByteArray &ba, QTextCodec *defaultCodec);

    QTextDecoder* makeDecoder() const;

    QTextEncoder* makeEncoder() const;

    bool canEncode(QChar) const;

    bool canEncode(const QString&) const;

    QString toUnicode(const QByteArray&) const;

    QString toUnicode(const char* chars) const;

    QByteArray fromUnicode(const QString& uc) const;

    enum ConversionFlag {

        DefaultConversion,

        ConvertInvalidToNull = 0x80000000,

        IgnoreHeader = 0x1,

        FreeFunction = 0x2

    };

    Q_DECLARE_FLAGS(ConversionFlags, ConversionFlag)

    struct Q_CORE_EXPORT ConverterState {

        ConverterState(ConversionFlags f = DefaultConversion)

            : flags(f), remainingChars(0), invalidChars(0), d(0) { state_data[0] = state_data[1] = state_data[2] = 0; }

        ~ConverterState();

        ConversionFlags flags;

        int remainingChars;

        int invalidChars;

        uint state_data[3];

        void *d;

    private:

        Q_DISABLE_COPY(ConverterState)

    };

    QString toUnicode(const char *in, int length, ConverterState *state = 0) const

        { return convertToUnicode(in, length, state); }

    QByteArray fromUnicode(const QChar *in, int length, ConverterState *state = 0) const

        { return convertFromUnicode(in, length, state); }

    virtual QByteArray name() const = 0;

    virtual QList<QByteArray> aliases() const;

    virtual int mibEnum() const = 0;

protected:

    virtual QString convertToUnicode(const char *in, int length, ConverterState *state) const = 0;

    virtual QByteArray convertFromUnicode(const QChar *in, int length, ConverterState *state) const = 0;

    QTextCodec();

    virtual ~QTextCodec();

public:

#ifdef QT3_SUPPORT

    static QT3_SUPPORT QTextCodec* codecForContent(const char*, int) { return 0; }

    static QT3_SUPPORT const char* locale();

    static QT3_SUPPORT QTextCodec* codecForName(const char* hint, int) { return codecForName(QByteArray(hint)); }

    QT3_SUPPORT QByteArray fromUnicode(const QString& uc, int& lenInOut) const;

    QT3_SUPPORT QString toUnicode(const QByteArray&, int len) const;

    QT3_SUPPORT QByteArray mimeName() const { return name(); }

    static QT3_SUPPORT QTextCodec *codecForIndex(int i) { return codecForName(availableCodecs().value(i)); }

#endif

private:

    friend class QTextCodecCleanup;

    static QTextCodec *cftr;

};

Q_DECLARE_OPERATORS_FOR_FLAGS(QTextCodec::ConversionFlags)

inline QTextCodec* QTextCodec::codecForTr() { return cftr; }

inline void QTextCodec::setCodecForTr(QTextCodec *c) { cftr = c; }

inline QTextCodec* QTextCodec::codecForCStrings() { return QString::codecForCStrings; }

inline void QTextCodec::setCodecForCStrings(QTextCodec *c) { QString::codecForCStrings = c; }

class Q_CORE_EXPORT QTextEncoder {

    Q_DISABLE_COPY(QTextEncoder)

public:

    explicit QTextEncoder(const QTextCodec *codec) : c(codec), state() {}

    ~QTextEncoder();

    QByteArray fromUnicode(const QString& str);

    QByteArray fromUnicode(const QChar *uc, int len);

#ifdef QT3_SUPPORT

    QByteArray fromUnicode(const QString& uc, int& lenInOut);

#endif

    bool hasFailure() const;

private:

    const QTextCodec *c;

    QTextCodec::ConverterState state;

};

class Q_CORE_EXPORT QTextDecoder {

    Q_DISABLE_COPY(QTextDecoder)

public:

    explicit QTextDecoder(const QTextCodec *codec) : c(codec), state() {}

    ~QTextDecoder();

    QString toUnicode(const char* chars, int len);

    QString toUnicode(const QByteArray &ba);

    void toUnicode(QString *target, const char *chars, int len);

    bool hasFailure() const;

private:

    const QTextCodec *c;

    QTextCodec::ConverterState state;

};

#endif // QT_NO_TEXTCODEC

QT_END_NAMESPACE

QT_END_HEADER

#endif // QTEXTCODEC_H