| #!/usr/bin/env python3 |
| # |
| # Copyright (c) 2019, The OpenThread Authors. |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
| # modification, are permitted provided that the following conditions are met: |
| # 1. Redistributions of source code must retain the above copyright |
| # notice, this list of conditions and the following disclaimer. |
| # 2. Redistributions in binary form must reproduce the above copyright |
| # notice, this list of conditions and the following disclaimer in the |
| # documentation and/or other materials provided with the distribution. |
| # 3. Neither the name of the copyright holder nor the |
| # names of its contributors may be used to endorse or promote products |
| # derived from this software without specific prior written permission. |
| # |
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| # POSSIBILITY OF SUCH DAMAGE. |
| |
| import io |
| import logging |
| |
| |
| class UnknownTlv(object): |
| |
| def __init__(self, type, data): |
| self.type = type |
| self.data = data |
| |
| def __repr__(self): |
| return 'UnknownTlv(%d, %s)' % (self.type, self.data) |
| |
| |
| class UnknownTlvFactory(object): |
| |
| def __init__(self, type): |
| self._type = type |
| |
| def parse(self, data, message_info): |
| return UnknownTlv(self._type, data) |
| |
| |
| class SubTlvsFactory(object): |
| |
| def __init__(self, sub_tlvs_factories): |
| self._sub_tlvs_factories = sub_tlvs_factories |
| |
| def _get_factory(self, _type): |
| try: |
| return self._sub_tlvs_factories[_type] |
| except KeyError: |
| logging.error('Could not find TLV factory. Unsupported TLV type: {}'.format(_type)) |
| return UnknownTlvFactory(_type) |
| |
| def parse(self, data, message_info): |
| sub_tlvs = [] |
| |
| while data.tell() < len(data.getvalue()): |
| _type = ord(data.read(1)) |
| |
| length = ord(data.read(1)) |
| value = data.read(length) |
| |
| factory = self._get_factory(_type) |
| |
| message_info.length = length |
| tlv = factory.parse(io.BytesIO(value), message_info) |
| |
| sub_tlvs.append(tlv) |
| |
| return sub_tlvs |