Source code for pcapkit.vendor.tcp.checksum

# -*- coding: utf-8 -*-
"""TCP Checksum
==================

.. module:: pcapkit.vendor.tcp.checksum

This module contains the vendor crawler for **TCP Checksum**,
which is automatically generating :class:`pcapkit.const.tcp.checksum.Checksum`.

"""

import collections
import sys
from typing import TYPE_CHECKING

from pcapkit.vendor.default import Vendor

if TYPE_CHECKING:
    from collections import Counter

__all__ = ['Checksum']

#: TCP checksum options.
DATA = {
    0:  'TCP checksum',
    1:  "8-bit Fletcher's algorithm",
    2:  "16-bit Fletcher's algorithm",
    3:  'Redundant Checksum Avoidance',
}  # type: dict[int, str]


[docs] class Checksum(Vendor): """TCP Checksum [:rfc:`1146`]""" #: Value limit checker. FLAG = 'isinstance(value, int) and 0 <= value <= 255' def request(self) -> 'dict[int, str]': # type: ignore[override] # pylint: disable=arguments-differ """Fetch registry data. Returns: TCP checksum options, i.e. :data:`~pcapkit.vendor.tcp.checksum.DATA`. """ return DATA def count(self, data: 'dict[int, str]') -> 'Counter[str]': # type: ignore[override] """Count field records. Args: data: Registry data. Returns: Field recordings. """ return collections.Counter(map(self.safe_name, data.values())) def process(self, data: 'dict[int, str]') -> 'tuple[list[str], list[str]]': # type: ignore[override] """Process CSV data. Args: data: Registry data. Returns: Enumeration fields and missing fields. """ enum = [] # type: list[str] miss = [ "return extend_enum(cls, 'Unassigned_%d' % value, value)", ] for code, name in data.items(): renm = self.rename(name, code) # type: ignore[arg-type] enum.append(f"{renm} = {code}".ljust(76)) return enum, miss
if __name__ == '__main__': sys.exit(Checksum()) # type: ignore[arg-type]