Source code for pcapkit.const.tcp.checksum
# -*- coding: utf-8 -*-
# pylint: disable=line-too-long,consider-using-f-string
"""TCP Checksum
==================
This module contains the constant enumeration for **TCP Checksum**,
which is automatically generated from :class:`pcapkit.vendor.tcp.checksum.Checksum`.
"""
from aenum import IntEnum, extend_enum
__all__ = ['Checksum']
[docs]class Checksum(IntEnum):
"""[Checksum] TCP Checksum [:rfc:`1146`]"""
TCP_checksum = 0
Checksum_8_bit_Fletcher_s_algorithm = 1
Checksum_16_bit_Fletcher_s_algorithm = 2
Redundant_Checksum_Avoidance = 3
@staticmethod
def get(key: 'int | str', default: 'int' = -1) -> 'Checksum':
"""Backport support for original codes.
Args:
key: Key to get enum item.
default: Default value if not found.
"""
if isinstance(key, int):
return Checksum(key)
if key not in Checksum._member_map_: # pylint: disable=no-member
extend_enum(Checksum, key, default)
return Checksum[key] # type: ignore[misc]
[docs] @classmethod
def _missing_(cls, value: 'int') -> 'Checksum':
"""Lookup function used when value is not found.
Args:
value: Value to get enum item.
"""
if not (isinstance(value, int) and 0 <= value <= 255):
raise ValueError('%r is not a valid %s' % (value, cls.__name__))
extend_enum(cls, 'Unassigned_%d' % value, value)
return cls(value)