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QString calcFileSize( qint64 value ) 
{  //pay attention that for size<1M "" returned
	QString sizeStr = "";
	if (value > 99ll * 1000ll * 1000ll * 1000ll * 1000ll)
		sizeStr = QString::number ((((value / 1000) / 1000) / 1000) / 1000) + QObject::tr (" TB");
	else if (value > 99ll * 1000ll * 1000ll * 1000ll)
		sizeStr = QString::number (((value / 1000) / 1000) / 1000) + QObject::tr (" GB");
	else if (value > 99 * 1000 * 1000)
		sizeStr = QString::number (((value / 1000) / 1000)) + QObject::tr (" MB");
	else if (value > 99 * 1000)
		sizeStr = QString::number ((value / 1000) ) + QObject::tr (" KB");
	else
		sizeStr = QString::number (value) + QObject::tr (" Bytes");
	return sizeStr;
}