_mpdu.py 文件源码

def _parseiesubel_(info,f=_iesubel_):
    """
     parse a variable length info element sub element
     :param info: packed string, next element starts at index 0
     :param f: function to apply to each sub element for further parsing
     :returns: list of parsed subelements
    """
    opt = []
    offset = 0
    while len(info) >= 2: # may be flags (0-octet subelements)
        sid,slen = struct.unpack_from('=2B',info,offset)
        opt.append((sid,f(info[offset+2:offset+2+slen],sid)))
        offset += 2 + slen
    return opt

#### OPTIONAL SUBELEMENTS -> the sub element id and length have been stripped