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// Most of the code here was originally written by Hans Petter Bieker,

// and is included in Qt with the author's permission, and the grateful

// thanks of the Qt team.

#include "qtsciicodec_p.h"

#include "qlist.h"

#ifndef QT_NO_CODECS

QT_BEGIN_NAMESPACE

static unsigned char qt_UnicodeToTSCII(ushort u1, ushort u2, ushort u3);

static unsigned int qt_TSCIIToUnicode(unsigned int code, uint *s);

#define IsTSCIIChar(c)        (((c) >= 0x80) && ((c) <= 0xfd))

/*! \class QTsciiCodec

    \reentrant

    \internal

*/

/*!

    Destroys the text codec object.

*/

QTsciiCodec::~QTsciiCodec()

{

}

/*!

    Converts the first \a len characters in \a uc from Unicode to this

    encoding, and returns the result in a byte array. The \a state contains

    some conversion flags, and is used by the codec to maintain state

    information.

*/

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

{

    char replacement = '?';

    if (state) {

        if (state->flags & ConvertInvalidToNull)

            replacement = 0;

    }

    int invalid = 0;

    QByteArray rstr(len, Qt::Uninitialized);

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

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

        QChar ch = uc[i];

        uchar j;

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

            // ASCII

            j = ch.cell();

        } else if ((j = qt_UnicodeToTSCII(uc[i].unicode(),

                                          uc[i + 1].unicode(),

                                          uc[i + 2].unicode()))) {

            // We have to check the combined chars first!

            i += 2;

        } else if ((j = qt_UnicodeToTSCII(uc[i].unicode(),

                                          uc[i + 1].unicode(), 0))) {

            i++;

        } else if ((j = qt_UnicodeToTSCII(uc[i].unicode(), 0, 0))) {

        } else {

            // Error

            j = replacement;

            ++invalid;

        }

        *cursor++ = j;

    }

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

    if (state) {

        state->invalidChars += invalid;

    }

    return rstr;

}

/*!

    Converts the first \a len characters in \a chars from this encoding

    to Unicode, and returns the result in a QString. The \a state contains

    some conversion flags, and is used by the codec to maintain state

    information.

*/

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

{

    QChar replacement = QChar::ReplacementCharacter;

    if (state) {

        if (state->flags & ConvertInvalidToNull)

            replacement = QChar::Null;

    }

    int invalid = 0;

    QString result;

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

        uchar ch = chars[i];

        if (ch < 0x80) {

            // ASCII

            result += QLatin1Char(ch);

        } else if (IsTSCIIChar(ch)) {

            // TSCII

            uint s[3];

            uint u = qt_TSCIIToUnicode(ch, s);

            uint *p = s;

            while (u--) {

                uint c = *p++;

                if (c)

                    result += QChar(c);

                else {

                    result += replacement;

                    ++invalid;

                }

            }

        } else {

            // Invalid

            result += replacement;

            ++invalid;

        }

    }

    if (state) {

        state->invalidChars += invalid;

    }

    return result;

}

/*!

    Returns the official name for the encoding that is handled by the codec.

    \sa QTextCodec::name()

*/

QByteArray QTsciiCodec::name() const

{

    return "TSCII";

}

/*!

    Returns the MIB enum for the encoding.

    \sa QTextCodec::mibEnum()

*/

int QTsciiCodec::mibEnum() const

{

  return 2107;

}

static const int UnToTsLast = 124; // 125 items -- so the last will be 124

static const ushort UnToTs [][4] = {

    // *Sorted* list of TSCII maping for unicode chars

    //FIRST  SECOND  THIRD   TSCII

    {0x00A0, 0x0000, 0x0000, 0xA0},

    {0x00A9, 0x0000, 0x0000, 0xA9},

    {0x0B83, 0x0000, 0x0000, 0xB7},

    {0x0B85, 0x0000, 0x0000, 0xAB},

    {0x0B86, 0x0000, 0x0000, 0xAC},

    {0x0B87, 0x0000, 0x0000, 0xAD},

    {0x0B88, 0x0000, 0x0000, 0xAE},

    {0x0B89, 0x0000, 0x0000, 0xAF},

    {0x0B8A, 0x0000, 0x0000, 0xB0},

    {0x0B8E, 0x0000, 0x0000, 0xB1},

    {0x0B8F, 0x0000, 0x0000, 0xB2},

    {0x0B90, 0x0000, 0x0000, 0xB3},

    {0x0B92, 0x0000, 0x0000, 0xB4},

    {0x0B93, 0x0000, 0x0000, 0xB5},

    {0x0B94, 0x0000, 0x0000, 0xB6},

    {0x0B95, 0x0000, 0x0000, 0xB8},

    {0x0B95, 0x0B82, 0x0000, 0xEC},

    {0x0B95, 0x0BC1, 0x0000, 0xCC},

    {0x0B95, 0x0BC2, 0x0000, 0xDC},

    {0x0B99, 0x0000, 0x0000, 0xB9},

    {0x0B99, 0x0B82, 0x0000, 0xED},

    {0x0B99, 0x0BC1, 0x0000, 0x99},

    {0x0B99, 0x0BC2, 0x0000, 0x9B},

    {0x0B9A, 0x0000, 0x0000, 0xBA},

    {0x0B9A, 0x0B82, 0x0000, 0xEE},

    {0x0B9A, 0x0BC1, 0x0000, 0xCD},

    {0x0B9A, 0x0BC2, 0x0000, 0xDD},

    {0x0B9C, 0x0000, 0x0000, 0x83},

    {0x0B9C, 0x0B82, 0x0000, 0x88},

    {0x0B9E, 0x0000, 0x0000, 0xBB},

    {0x0B9E, 0x0B82, 0x0000, 0xEF},

    {0x0B9E, 0x0BC1, 0x0000, 0x9A},

    {0x0B9E, 0x0BC2, 0x0000, 0x9C},

    {0x0B9F, 0x0000, 0x0000, 0xBC},

    {0x0B9F, 0x0B82, 0x0000, 0xF0},

    {0x0B9F, 0x0BBF, 0x0000, 0xCA},

    {0x0B9F, 0x0BC0, 0x0000, 0xCB},

    {0x0B9F, 0x0BC1, 0x0000, 0xCE},

    {0x0B9F, 0x0BC2, 0x0000, 0xDE},

    {0x0BA1, 0x0B82, 0x0000, 0xF2},

    {0x0BA3, 0x0000, 0x0000, 0xBD},

    {0x0BA3, 0x0B82, 0x0000, 0xF1},

    {0x0BA3, 0x0BC1, 0x0000, 0xCF},

    {0x0BA3, 0x0BC2, 0x0000, 0xDF},

    {0x0BA4, 0x0000, 0x0000, 0xBE},

    {0x0BA4, 0x0BC1, 0x0000, 0xD0},

    {0x0BA4, 0x0BC2, 0x0000, 0xE0},

    {0x0BA8, 0x0000, 0x0000, 0xBF},

    {0x0BA8, 0x0B82, 0x0000, 0xF3},

    {0x0BA8, 0x0BC1, 0x0000, 0xD1},

    {0x0BA8, 0x0BC2, 0x0000, 0xE1},

    {0x0BA9, 0x0000, 0x0000, 0xC9},

    {0x0BA9, 0x0B82, 0x0000, 0xFD},

    {0x0BA9, 0x0BC1, 0x0000, 0xDB},

    {0x0BA9, 0x0BC2, 0x0000, 0xEB},

    {0x0BAA, 0x0000, 0x0000, 0xC0},

    {0x0BAA, 0x0B82, 0x0000, 0xF4},

    {0x0BAA, 0x0BC1, 0x0000, 0xD2},

    {0x0BAA, 0x0BC2, 0x0000, 0xE2},

    {0x0BAE, 0x0000, 0x0000, 0xC1},

    {0x0BAE, 0x0B82, 0x0000, 0xF5},

    {0x0BAE, 0x0BC1, 0x0000, 0xD3},

    {0x0BAE, 0x0BC2, 0x0000, 0xE3},

    {0x0BAF, 0x0000, 0x0000, 0xC2},

    {0x0BAF, 0x0B82, 0x0000, 0xF6},

    {0x0BAF, 0x0BC1, 0x0000, 0xD4},

    {0x0BAF, 0x0BC2, 0x0000, 0xE4},

    {0x0BB0, 0x0000, 0x0000, 0xC3},

    {0x0BB0, 0x0B82, 0x0000, 0xF7},

    {0x0BB0, 0x0BC1, 0x0000, 0xD5},

    {0x0BB0, 0x0BC2, 0x0000, 0xE5},

    {0x0BB1, 0x0000, 0x0000, 0xC8},

    {0x0BB1, 0x0B82, 0x0000, 0xFC},

    {0x0BB1, 0x0BC1, 0x0000, 0xDA},

    {0x0BB1, 0x0BC2, 0x0000, 0xEA},

    {0x0BB2, 0x0000, 0x0000, 0xC4},

    {0x0BB2, 0x0B82, 0x0000, 0xF8},

    {0x0BB2, 0x0BC1, 0x0000, 0xD6},

    {0x0BB2, 0x0BC2, 0x0000, 0xE6},

    {0x0BB3, 0x0000, 0x0000, 0xC7},

    {0x0BB3, 0x0B82, 0x0000, 0xFB},

    {0x0BB3, 0x0BC1, 0x0000, 0xD9},

    {0x0BB3, 0x0BC2, 0x0000, 0xE9},

    {0x0BB4, 0x0000, 0x0000, 0xC6},

    {0x0BB4, 0x0B82, 0x0000, 0xFA},

    {0x0BB4, 0x0BC1, 0x0000, 0xD8},

    {0x0BB4, 0x0BC2, 0x0000, 0xE8},

    {0x0BB5, 0x0000, 0x0000, 0xC5},

    {0x0BB5, 0x0B82, 0x0000, 0xF9},

    {0x0BB5, 0x0BC1, 0x0000, 0xD7},

    {0x0BB5, 0x0BC2, 0x0000, 0xE7},

    {0x0BB7, 0x0000, 0x0000, 0x84},

    {0x0BB7, 0x0B82, 0x0000, 0x89},

    {0x0BB8, 0x0000, 0x0000, 0x85},

    {0x0BB8, 0x0B82, 0x0000, 0x8A},

    {0x0BB9, 0x0000, 0x0000, 0x86},

    {0x0BB9, 0x0B82, 0x0000, 0x8B},

    {0x0BBE, 0x0000, 0x0000, 0xA1},

    {0x0BBF, 0x0000, 0x0000, 0xA2},

    {0x0BC0, 0x0000, 0x0000, 0xA3},

    {0x0BC1, 0x0000, 0x0000, 0xA4},

    {0x0BC2, 0x0000, 0x0000, 0xA5},

    {0x0BC6, 0x0000, 0x0000, 0xA6},

    {0x0BC7, 0x0000, 0x0000, 0xA7},

    {0x0BC8, 0x0000, 0x0000, 0xA8},

    {0x0BCC, 0x0000, 0x0000, 0xAA},

    {0x0BE6, 0x0000, 0x0000, 0x80},

    {0x0BE7, 0x0000, 0x0000, 0x81},

    {0x0BE7, 0x0BB7, 0x0000, 0x87},

    {0x0BE7, 0x0BB7, 0x0B82, 0x8C},

    {0x0BE8, 0x0000, 0x0000, 0x8D},

    {0x0BE9, 0x0000, 0x0000, 0x8E},

    {0x0BEA, 0x0000, 0x0000, 0x8F},

    {0x0BEB, 0x0000, 0x0000, 0x90},

    {0x0BEC, 0x0000, 0x0000, 0x95},

    {0x0BED, 0x0000, 0x0000, 0x96},

    {0x0BEE, 0x0000, 0x0000, 0x97},

    {0x0BEF, 0x0000, 0x0000, 0x98},

    {0x0BF0, 0x0000, 0x0000, 0x9D},

    {0x0BF1, 0x0000, 0x0000, 0x9E},

    {0x0BF2, 0x0000, 0x0000, 0x9F},

    {0x2018, 0x0000, 0x0000, 0x91},

    {0x2019, 0x0000, 0x0000, 0x92},

    {0x201C, 0x0000, 0x0000, 0x93},

    {0x201C, 0x0000, 0x0000, 0x94}

};

static const ushort TsToUn [][3] = {

    // Starting at 0x80

    {0x0BE6, 0x0000, 0x0000},

    {0x0BE7, 0x0000, 0x0000},

    {0x0000, 0x0000, 0x0000}, // unknown

    {0x0B9C, 0x0000, 0x0000},

    {0x0BB7, 0x0000, 0x0000},

    {0x0BB8, 0x0000, 0x0000},

    {0x0BB9, 0x0000, 0x0000},

    {0x0BE7, 0x0BB7, 0x0000},

    {0x0B9C, 0x0B82, 0x0000},

    {0x0BB7, 0x0B82, 0x0000},

    {0x0BB8, 0x0B82, 0x0000},

    {0x0BB9, 0x0B82, 0x0000},

    {0x0BE7, 0x0BB7, 0x0B82},

    {0x0BE8, 0x0000, 0x0000},

    {0x0BE9, 0x0000, 0x0000},

    {0x0BEA, 0x0000, 0x0000},

    {0x0BEB, 0x0000, 0x0000},

    {0x2018, 0x0000, 0x0000},

    {0x2019, 0x0000, 0x0000},

    {0x201C, 0x0000, 0x0000},

    {0x201C, 0x0000, 0x0000}, // two of the same??

    {0x0BEC, 0x0000, 0x0000},

    {0x0BED, 0x0000, 0x0000},

    {0x0BEE, 0x0000, 0x0000},

    {0x0BEF, 0x0000, 0x0000},

    {0x0B99, 0x0BC1, 0x0000},

    {0x0B9E, 0x0BC1, 0x0000},

    {0x0B99, 0x0BC2, 0x0000},

    {0x0B9E, 0x0BC2, 0x0000},

    {0x0BF0, 0x0000, 0x0000},

    {0x0BF1, 0x0000, 0x0000},

    {0x0BF2, 0x0000, 0x0000},

    {0x00A0, 0x0000, 0x0000},

    {0x0BBE, 0x0000, 0x0000},

    {0x0BBF, 0x0000, 0x0000},

    {0x0BC0, 0x0000, 0x0000},

    {0x0BC1, 0x0000, 0x0000},

    {0x0BC2, 0x0000, 0x0000},

    {0x0BC6, 0x0000, 0x0000},

    {0x0BC7, 0x0000, 0x0000},

    {0x0BC8, 0x0000, 0x0000},

    {0x00A9, 0x0000, 0x0000},

    {0x0BCC, 0x0000, 0x0000},

    {0x0B85, 0x0000, 0x0000},

    {0x0B86, 0x0000, 0x0000},

    {0x0B87, 0x0000, 0x0000},

    {0x0B88, 0x0000, 0x0000},

    {0x0B89, 0x0000, 0x0000},

    {0x0B8A, 0x0000, 0x0000},

    {0x0B8E, 0x0000, 0x0000},

    {0x0B8F, 0x0000, 0x0000},

    {0x0B90, 0x0000, 0x0000},

    {0x0B92, 0x0000, 0x0000},

    {0x0B93, 0x0000, 0x0000},

    {0x0B94, 0x0000, 0x0000},

    {0x0B83, 0x0000, 0x0000},

    {0x0B95, 0x0000, 0x0000},

    {0x0B99, 0x0000, 0x0000},

    {0x0B9A, 0x0000, 0x0000},

    {0x0B9E, 0x0000, 0x0000},

    {0x0B9F, 0x0000, 0x0000},

    {0x0BA3, 0x0000, 0x0000},

    {0x0BA4, 0x0000, 0x0000},

    {0x0BA8, 0x0000, 0x0000},

    {0x0BAA, 0x0000, 0x0000},

    {0x0BAE, 0x0000, 0x0000},

    {0x0BAF, 0x0000, 0x0000},

    {0x0BB0, 0x0000, 0x0000},

    {0x0BB2, 0x0000, 0x0000},

    {0x0BB5, 0x0000, 0x0000},

    {0x0BB4, 0x0000, 0x0000},

    {0x0BB3, 0x0000, 0x0000},

    {0x0BB1, 0x0000, 0x0000},

    {0x0BA9, 0x0000, 0x0000},

    {0x0B9F, 0x0BBF, 0x0000},

    {0x0B9F, 0x0BC0, 0x0000},

    {0x0B95, 0x0BC1, 0x0000},

    {0x0B9A, 0x0BC1, 0x0000},

    {0x0B9F, 0x0BC1, 0x0000},

    {0x0BA3, 0x0BC1, 0x0000},

    {0x0BA4, 0x0BC1, 0x0000},

    {0x0BA8, 0x0BC1, 0x0000},

    {0x0BAA, 0x0BC1, 0x0000},

    {0x0BAE, 0x0BC1, 0x0000},

    {0x0BAF, 0x0BC1, 0x0000},

    {0x0BB0, 0x0BC1, 0x0000},

    {0x0BB2, 0x0BC1, 0x0000},

    {0x0BB5, 0x0BC1, 0x0000},

    {0x0BB4, 0x0BC1, 0x0000},

    {0x0BB3, 0x0BC1, 0x0000},

    {0x0BB1, 0x0BC1, 0x0000},

    {0x0BA9, 0x0BC1, 0x0000},

    {0x0B95, 0x0BC2, 0x0000},

    {0x0B9A, 0x0BC2, 0x0000},

    {0x0B9F, 0x0BC2, 0x0000},

    {0x0BA3, 0x0BC2, 0x0000},

    {0x0BA4, 0x0BC2, 0x0000},

    {0x0BA8, 0x0BC2, 0x0000},

    {0x0BAA, 0x0BC2, 0x0000},

    {0x0BAE, 0x0BC2, 0x0000},

    {0x0BAF, 0x0BC2, 0x0000},

    {0x0BB0, 0x0BC2, 0x0000},

    {0x0BB2, 0x0BC2, 0x0000},

    {0x0BB5, 0x0BC2, 0x0000},

    {0x0BB4, 0x0BC2, 0x0000},

    {0x0BB3, 0x0BC2, 0x0000},

    {0x0BB1, 0x0BC2, 0x0000},

    {0x0BA9, 0x0BC2, 0x0000},

    {0x0B95, 0x0B82, 0x0000},

    {0x0B99, 0x0B82, 0x0000},

    {0x0B9A, 0x0B82, 0x0000},

    {0x0B9E, 0x0B82, 0x0000},

    {0x0B9F, 0x0B82, 0x0000},

    {0x0BA3, 0x0B82, 0x0000},

    {0x0BA1, 0x0B82, 0x0000},

    {0x0BA8, 0x0B82, 0x0000},

    {0x0BAA, 0x0B82, 0x0000},

    {0x0BAE, 0x0B82, 0x0000},

    {0x0BAF, 0x0B82, 0x0000},

    {0x0BB0, 0x0B82, 0x0000},

    {0x0BB2, 0x0B82, 0x0000},

    {0x0BB5, 0x0B82, 0x0000},

    {0x0BB4, 0x0B82, 0x0000},

    {0x0BB3, 0x0B82, 0x0000},

    {0x0BB1, 0x0B82, 0x0000},

    {0x0BA9, 0x0B82, 0x0000}

};

static int cmp(const ushort *s1, const ushort *s2, size_t len)

{

    int diff = 0;

    while (len-- && (diff = *s1++ - *s2++) == 0)

        ;

    return diff;

}

static unsigned char qt_UnicodeToTSCII(ushort u1, ushort u2, ushort u3)

{

    ushort s[3];

    s[0] = u1;

    s[1] = u2;

    s[2] = u3;

    int a = 0;  // start pos

    int b = UnToTsLast; // end pos

    // do a binary search for the composed unicode in the list

    while (a <= b) {

        int w = (a + b) / 2;

        int j = cmp(UnToTs[w], s, 3);

        if (j == 0)

            // found it

            return UnToTs[w][3];

        if (j < 0)

            a = w + 1;

        else

            b = w - 1;

    }

    return 0;

}

static unsigned int qt_TSCIIToUnicode(uint code, uint *s)

{

    int len = 0;

    for (int i = 0; i < 3; i++) {

        uint u = TsToUn[code & 0x7f][i];

        s[i] = u;

        if (s[i]) len = i + 1;

    }

    return len;

}

QT_END_NAMESPACE

#endif // QT_NO_CODECS