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# -*- coding: utf-8 -*-
#
# SPDX-License-Identifier: MIT
"""Extra classes for Construct."""
import datetime
import construct
class Timestamp(construct.Adapter):
"""Adapter for converting datetime object into timestamps.
Take two parameters: the subcon object to output the resulting timestamp as,
and an optional epoch offset to the UNIX Epoch.
"""
__slots__ = ["epoch"]
def __init__(self, subcon, epoch: int = 0) -> None:
super(Timestamp, self).__init__(subcon)
self.epoch = epoch
def _encode(self, obj: datetime.datetime, context, path) -> int:
assert isinstance(obj, datetime.datetime)
epoch_date = datetime.datetime.utcfromtimestamp(self.epoch)
delta = obj - epoch_date
return int(delta.total_seconds())
def _decode(self, obj: int, context, path) -> datetime.datetime:
return datetime.datetime.utcfromtimestamp(obj + self.epoch)
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