UConverter *QIcuCodec::getConverter(QTextCodec::ConverterState *state) const
{
    UConverter *conv = 0;
    if (state) {
        if (!state->d) {
            // first time
            state->flags |= QTextCodec::FreeFunction;
            QTextCodecUnalignedPointer::encode(state->state_data, qIcuCodecStateFree);
            UErrorCode error = U_ZERO_ERROR;
            state->d = ucnv_open(m_name, &error);
            ucnv_setSubstChars(static_cast<UConverter *>(state->d),
                               state->flags & QTextCodec::ConvertInvalidToNull ? "\0" : "?", 1, &error);
            if (U_FAILURE(error))
                qDebug() << "getConverter(state) ucnv_open failed" << m_name << u_errorName(error);
        }
        conv = static_cast<UConverter *>(state->d);
    }
    if (!conv) {
        // stateless conversion
        UErrorCode error = U_ZERO_ERROR;
        conv = ucnv_open(m_name, &error);
        ucnv_setSubstChars(conv, "?", 1, &error);
        if (U_FAILURE(error))
            qDebug() << "getConverter(no state) ucnv_open failed" << m_name << u_errorName(error);
    }
    return conv;
}