| Rich Lane | 629393f | 2013-01-10 15:37:33 -0800 | [diff] [blame] | 1 | import struct |
| 2 | import match as match |
| 3 | from match import oxm_tlv |
| 4 | from binascii import b2a_hex |
| 5 | from base_list import ofp_base_list |
| 6 | |
| 7 | |
| 8 | class match_list(ofp_base_list): |
| 9 | |
| 10 | def __init__(self): |
| 11 | ofp_base_list.__init__(self) |
| 12 | self.tlvs = self.items |
| 13 | self.name = "match" |
| 14 | self.class_list = match.match_class_list |
| 15 | |
| 16 | def __len__(self): |
| 17 | return sum([len(i) for i in self]) |
| 18 | |
| 19 | def unpack(self, binary_string, bytes=None): |
| 20 | if bytes <= 4: |
| 21 | return binary_string[4:] |
| 22 | if bytes == None: |
| 23 | bytes = len(binary_string) |
| 24 | offset = 0 |
| 25 | cur_string = binary_string |
| 26 | while offset < bytes: |
| 27 | read = 0 |
| 28 | oxm_class, oxm_fieldhm, oxm_length = struct.unpack("!HBB", cur_string[read:read+4]) |
| 29 | #Found padding bytes? |
| 30 | if not oxm_class: |
| 31 | break |
| 32 | oxm_field = oxm_fieldhm >> 1 |
| 33 | oxm_hasmask = oxm_fieldhm & 0x00000001 |
| 34 | payload = struct.unpack("!" + str(oxm_length) + "s", cur_string[read+4:read+4+oxm_length])[0] |
| 35 | if oxm_hasmask: |
| 36 | value, mask = payload[:oxm_length/2], payload[oxm_length/2:] |
| 37 | else: |
| 38 | value, mask = payload, None |
| 39 | oxm = oxm_tlv(oxm_field, oxm_hasmask, oxm_length, value,mask, oxm_class) |
| 40 | self.tlvs.append(oxm) |
| 41 | read = 4 + oxm_length |
| 42 | offset += read |
| 43 | cur_string = cur_string[read:] |
| 44 | |
| 45 | return cur_string |