replaced decimal.localcontext usage with compat version (bugfix JarryShaw#139)

Author: JarryShaw

pcapkit/protocols/data/misc/pcapng.py

@@ -8,6 +8,7 @@
 from pcapkit.corekit.infoclass import info_final
 from pcapkit.corekit.multidict import MultiDict
 from pcapkit.protocols.data.data import Data
+from pcapkit.utilities.compat import localcontext
 
 __all__ = [
     'PCAPNG',
@@ -480,7 +481,7 @@ class SimplePacketBlock(PCAPNG):
 
     def __post_init__(self) -> 'None':
         """Post-initialization handling."""
-        with decimal.localcontext(prec=64):
+        with localcontext(prec=64):
             self.__update__(
                 interface_id=0,
                 timestamp=datetime.datetime.fromtimestamp(0, datetime.timezone.utc),

pcapkit/protocols/misc/pcap/frame.py

@@ -34,6 +34,7 @@
 from pcapkit.protocols.data.misc.pcap.frame import FrameInfo as Data_FrameInfo
 from pcapkit.protocols.protocol import Protocol
 from pcapkit.protocols.schema.misc.pcap.frame import Frame as Schema_Frame
+from pcapkit.utilities.compat import localcontext
 from pcapkit.utilities.exceptions import UnsupportedCall, stacklevel
 from pcapkit.utilities.warnings import ProtocolWarning, RegistryWarning, warn
 
@@ -209,7 +210,7 @@ def read(self, length: 'Optional[int]' = None, *, _read: 'bool' = True, **kwargs
         _ilen = schema.incl_len
         _olen = schema.orig_len
 
-        with decimal.localcontext(prec=64):
+        with localcontext(prec=64):
             if self._nsec:
                 _epch = _tsss + decimal.Decimal(_tsus) / 1_000_000_000
             else:
@@ -409,7 +410,7 @@ def _make_timestamp(self, timestamp: 'Optional[float | Decimal | dt_type | int]'
             Second and microsecond/nanosecond value of timestamp.
 
         """
-        with decimal.localcontext(prec=64):
+        with localcontext(prec=64):
             if timestamp is None:
                 if py37 and nanosecond:
                     timestamp = decimal.Decimal(time.time_ns()) / 1_000_000_000

pcapkit/protocols/misc/pcapng.py

@@ -169,7 +169,7 @@
 from pcapkit.protocols.schema.misc.pcapng import WireGuardKeyLog as Schema_WireGuardKeyLog
 from pcapkit.protocols.schema.misc.pcapng import ZigBeeAPSKey as Schema_ZigBeeAPSKey
 from pcapkit.protocols.schema.misc.pcapng import ZigBeeNWKKey as Schema_ZigBeeNWKKey
-from pcapkit.utilities.compat import StrEnum
+from pcapkit.utilities.compat import StrEnum, localcontext
 from pcapkit.utilities.exceptions import ProtocolError, UnsupportedCall, stacklevel
 from pcapkit.utilities.warnings import (AttributeWarning, DeprecatedFormatWarning, ProtocolWarning,
                                         RegistryWarning, warn)
@@ -1189,7 +1189,7 @@ def _read_timestamp(self, timestamp_high: 'int', timestamp_low: 'int', *,
         tzone = self._get_timezone(interface_id)
 
         timestamp_raw = (timestamp_high << 32) | timestamp_low
-        with decimal.localcontext(prec=64):
+        with localcontext(prec=64):
             timestamp_epoch = decimal.Decimal(timestamp_raw) / self._get_resolution(interface_id) + \
                 self._get_offset(interface_id)
             ts_decimal = timestamp_epoch + decimal.Decimal(
@@ -1234,7 +1234,7 @@ def _make_timestamp(self, timestamp: 'Optional[float | Decimal | dt_type | int]'
             based on the given offset and timezone conversion.
 
         """
-        with decimal.localcontext(prec=64):
+        with localcontext(prec=64):
             if timestamp is None:
                 if py37 and self.nanosecond:
                     timestamp = decimal.Decimal(time.time_ns()) / 1_000_000_000

pcapkit/protocols/schema/transport/tcp.py

@@ -41,8 +41,6 @@
     from ipaddress import IPv4Address, IPv6Address
     from typing import Any, Optional
 
-    from typing_extensions import Literal
-
     from pcapkit.corekit.fields.field import _Field as Field
     from pcapkit.protocols.protocol import Protocol