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