QString size_human ( float size )
{
    float num = size;
    QStringList list;
    list << "KB" << "MB" << "GB" << "TB";
    QStringListIterator i ( list );
    QString unit ( "bytes" );
    while ( num >= 1024.0 && i.hasNext() )
    {
        unit = i.next();
        num /= 1024.0;
    }
    return QString().setNum ( num, 'f', 2 ) + " " + unit;
}