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// Most of the code here was originally written by Serika Kurusugawa

// a.k.a. Junji Takagi, and is included in Qt with the author's permission,

// and the grateful thanks of the Qt team.

/*! \class QSjisCodec

    \reentrant

    \internal

*/

#include "qsjiscodec.h"

#include "qlist.h"

QT_BEGIN_NAMESPACE

#ifndef QT_NO_TEXTCODEC

enum {

    Esc = 0x1b

};

#define        IsKana(c)        (((c) >= 0xa1) && ((c) <= 0xdf))

#define        IsSjisChar1(c)        ((((c) >= 0x81) && ((c) <= 0x9f)) ||        \

                         (((c) >= 0xe0) && ((c) <= 0xfc)))

#define        IsSjisChar2(c)        (((c) >= 0x40) && ((c) != 0x7f) && ((c) <= 0xfc))

#define        IsUserDefinedChar1(c)        (((c) >= 0xf0) && ((c) <= 0xfc))

#define        QValidChar(u)        ((u) ? QChar((ushort)(u)) : QChar(QChar::ReplacementCharacter))

/*!

  Creates a Shift-JIS codec. Note that this is done automatically by

  the QApplication, you do not need construct your own.

*/

QSjisCodec::QSjisCodec() : conv(QJpUnicodeConv::newConverter(QJpUnicodeConv::Default))

{

}

/*!

  Destroys the Shift-JIS codec.

*/

QSjisCodec::~QSjisCodec()

{

    delete (QJpUnicodeConv*)conv;

    conv = 0;

}

QByteArray QSjisCodec::convertFromUnicode(const QChar *uc, int len, ConverterState *state) const

{

    char replacement = '?';

    if (state) {

        if (state->flags & ConvertInvalidToNull)

            replacement = 0;

    }

    int invalid = 0;

    int rlen = 2*len + 1;

    QByteArray rstr;

    rstr.resize(rlen);

    uchar* cursor = (uchar*)rstr.data();

    for (int i = 0; i < len; i++) {

        QChar ch = uc[i];

        uint j;

        if (ch.row() == 0x00 && ch.cell() < 0x80) {

            // ASCII

            *cursor++ = ch.cell();

        } else if ((j = conv->unicodeToJisx0201(ch.row(), ch.cell())) != 0) {

            // JIS X 0201 Latin or JIS X 0201 Kana

            *cursor++ = j;

        } else if ((j = conv->unicodeToSjis(ch.row(), ch.cell())) != 0) {

            // JIS X 0208

            *cursor++ = (j >> 8);

            *cursor++ = (j & 0xff);

        } else if ((j = conv->unicodeToSjisibmvdc(ch.row(), ch.cell())) != 0) {

            // JIS X 0208 IBM VDC

            *cursor++ = (j >> 8);

            *cursor++ = (j & 0xff);

        } else if ((j = conv->unicodeToCp932(ch.row(), ch.cell())) != 0) {

            // CP932 (for lead bytes 87, ee & ed)

            *cursor++ = (j >> 8);

            *cursor++ = (j & 0xff);

        } else if ((j = conv->unicodeToJisx0212(ch.row(), ch.cell())) != 0) {

            // JIS X 0212 (can't be encoded in ShiftJIS !)

            *cursor++ = 0x81;        // white square

            *cursor++ = 0xa0;        // white square

        } else {

            // Error

            *cursor++ = replacement;

            ++invalid;

        }

    }

    rstr.resize(cursor - (const uchar*)rstr.constData());

    if (state) {

        state->invalidChars += invalid;

    }

    return rstr;

}

QString QSjisCodec::convertToUnicode(const char* chars, int len, ConverterState *state) const

{

    uchar buf[1] = {0};

    int nbuf = 0;

    QChar replacement = QChar::ReplacementCharacter;

    if (state) {

        if (state->flags & ConvertInvalidToNull)

            replacement = QChar::Null;

        nbuf = state->remainingChars;

        buf[0] = state->state_data[0];

    }

    int invalid = 0;

    uint u= 0;

    QString result;

    for (int i=0; i<len; i++) {

        uchar ch = chars[i];

        switch (nbuf) {

        case 0:

            if (ch < 0x80 || IsKana(ch)) {

                // JIS X 0201 Latin or JIS X 0201 Kana

                u = conv->jisx0201ToUnicode(ch);

                result += QValidChar(u);

            } else if (IsSjisChar1(ch)) {

                // JIS X 0208

                buf[0] = ch;

                nbuf = 1;

            } else {

                // Invalid

                result += replacement;

                ++invalid;

            }

            break;

        case 1:

            // JIS X 0208

            if (IsSjisChar2(ch)) {

                if ((u = conv->sjisibmvdcToUnicode(buf[0], ch))) {

                    result += QValidChar(u);

                } else if ((u = conv->cp932ToUnicode(buf[0], ch))) {

                    result += QValidChar(u);

                }

                else if (IsUserDefinedChar1(buf[0])) {

                    result += QChar::ReplacementCharacter;

                } else {

                    u = conv->sjisToUnicode(buf[0], ch);

                    result += QValidChar(u);

                }

            } else {

                // Invalid

                result += replacement;

                ++invalid;

            }

            nbuf = 0;

            break;

        }

    }

    if (state) {

        state->remainingChars = nbuf;

        state->state_data[0] = buf[0];

        state->invalidChars += invalid;

    }

    return result;

}

int QSjisCodec::_mibEnum()

{

    return 17;

}

QByteArray QSjisCodec::_name()

{

    return "Shift_JIS";

}

/*!

    Returns the codec's mime name.

*/

QList<QByteArray> QSjisCodec::_aliases()

{

    QList<QByteArray> list;

    list << "SJIS" // Qt 3 compat

         << "MS_Kanji";

    return list;

}

#endif // QT_NO_TEXTCODEC

QT_END_NAMESPACE