_mpdu.py 文件源码

def _iesubelfmsreq_(s,sid):
    """ :returns: parsed fms request subelement """
    ret = s
    if sid == std.EID_FMS_REQ_SUBELEMENT_FMS: # Std Fig. 8-327
        # Note: the 4-byte rate identification is defined in 8.4.1.32
        # as 1|1|2
        di,mi,m,i,r = struct.unpack_from('=4BH',s)
        rem = s[6:]
        ret = {'delv-intv':di,
               'max-delv-intv':mi,
               'rate-ident':{'mask':_rateidmask_(m),
                             'mcs-index':i,
                             'rate':r}}

        # there are one or more tclas elements folled by an option tclas
        # processing element
        while rem:
            eid,tlen = struct.unpack_from('=2B',rem)
            if eid == std.EID_TCLAS:
                if not 'tclas' in ret: ret['tclas'] = []
                ret['tclas'].append(_parseie_(std.EID_TCLAS,rem[:tlen]))
                ret = ret[2+tlen:]
            elif eid == std.EID_TCLAS_PRO:
                ret['tclas-pro'] = _parseie_(std.EID_TCLAS_PRO,ret)
                # could use a break here but want to make sure
                # there are not hanging elements
                ret = ret[3:]
    elif sid == std.EID_FMS_REQ_SUBELEMENT_VEND:
        ret = _parseie_(std.EID_VEND_SPEC,s)
    return ret

# FMS Response subelements Std Table 8-159 & figures commented below