source: trunk/src/corelib/codecs/qtsciicodec.cpp@ 168

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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 Trolltech 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;
    rstr.resize(len);
    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) {