def get_dir_from_zipfile(zip_file, fallback=None):
    """Return the name of the root folder in a zip file.

    :param zip_file: a :class:`zipfile.ZipFile` instance.
    :param fallback: if `None`, the name of the zip file is used. This is
        returned if the zip file contains more than one top-level directory,
        or none at all.
    """
    fallback = fallback or zip_file.filename
    directories = [name for name in zip_file.namelist() if name.endswith("/")
                   and len(PurePath(name).parts) == 1]
    return fallback if len(directories) > 1 else directories[0]
def set_add_spinboxes_maximum_on_label_change(self):
        nbits = self.current_label.end - self.current_label.start  # Use Bit Start/End for maximum calc.
        if nbits >= 32:
            nbits = 31
        max_val = 2 ** nbits - 1
        self.ui.sBAddRangeStart.setMaximum(max_val - 1)
        self.ui.sBAddRangeEnd.setMaximum(max_val)
        self.ui.sBAddRangeEnd.setValue(max_val)
        self.ui.sBAddRangeStep.setMaximum(max_val)
        self.ui.spinBoxLowerBound.setMaximum(max_val - 1)
        self.ui.spinBoxUpperBound.setMaximum(max_val)
        self.ui.spinBoxUpperBound.setValue(max_val)
        self.ui.spinBoxBoundaryNumber.setMaximum(int(max_val / 2) + 1)
        self.ui.spinBoxRandomMinimum.setMaximum(max_val - 1)
        self.ui.spinBoxRandomMaximum.setMaximum(max_val)
        self.ui.spinBoxRandomMaximum.setValue(max_val)