1 # Copyright (C) 2012 Nippon Telegraph and Telephone Corporation.
2 # Copyright (C) 2012 Isaku Yamahata <yamahata at private email ne jp>
4 # Licensed under the Apache License, Version 2.0 (the "License");
5 # you may not use this file except in compliance with the License.
6 # You may obtain a copy of the License at
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
17 # Internal representation of datapath id is quad int
18 # string representation is in hex without '0x'
21 _DPID_FMT = '%0{0}x'.format(_DPID_LEN)
22 DPID_PATTERN = r'[0-9a-f]{%d}' % _DPID_LEN
25 def dpid_to_str(dpid):
26 return _DPID_FMT % dpid
29 def str_to_dpid(dpid_str):
30 assert len(dpid_str) == _DPID_LEN
31 return int(dpid_str, 16)