mirror of https://gerrit.osmocom.org/pysim
43 lines
1.5 KiB
Python
43 lines
1.5 KiB
Python
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from construct import *
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from pySim.utils import b2h, h2b
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"""Utility code related to the integration of the 'construct' declarative parser."""
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# (C) 2021 by Harald Welte <laforge@osmocom.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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class HexAdapter(Adapter):
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"""convert a bytes() type to a string of hex nibbles."""
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def _decode(self, obj, context, path):
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return b2h(obj)
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def _encode(self, obj, context, path):
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return h2b(obj)
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def filter_dict(d, exclude_prefix='_'):
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"""filter the input dict to ensure no keys starting with 'exclude_prefix' remain."""
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res = {}
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for (key, value) in d.items():
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if key.startswith(exclude_prefix):
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continue
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if type(value) is dict:
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res[key] = filter_dict(value)
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else:
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res[key] = value
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return res
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# here we collect some shared / common definitions of data types
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LV = Prefixed(Int8ub, HexAdapter(GreedyBytes))
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