69 строки
2.2 KiB
Python
Исполняемый файл
69 строки
2.2 KiB
Python
Исполняемый файл
from abc import ABC, abstractmethod
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from typing import Any
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from .exceptions import DMRPFieldOutOfRangeException
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class DMRPFieldBase(ABC):
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def __init__(self, name: str, offset: int, bytelen: int) -> None:
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self.name, self.offset, self.bytelen = name, offset, bytelen
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self.eoffset = offset + bytelen
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self.typename = f"bytes{self.bytelen}"
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def get(self, obj) -> bytes:
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return bytes(obj._data[self.offset:self.eoffset])
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def set(self, obj, value: bytes):
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if not isinstance(value, bytes) or self.bytelen != len(value):
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raise DMRPFieldOutOfRangeException(self.name, self.typename)
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obj._data[self.offset:self.eoffset] = value
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@abstractmethod
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def __get__(self, obj, cls = None) -> Any: ...
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@abstractmethod
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def __set__(self, obj, value: Any) -> None: ...
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class DMRPFieldBytes(DMRPFieldBase):
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def __get__(self, obj, cls = None) -> bytes:
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return self.get(obj)
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def __set__(self, obj, value: bytes) -> None:
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self.set(obj, value)
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class DMRPFieldStr(DMRPFieldBase):
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def __init__(self, name: str, offset: int, bytelen: int,
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pad_with: bytes = b'\x20') -> None:
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super().__init__(name, offset, bytelen)
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self.typename = 'str'
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self.pad_with = pad_with
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def __get__(self, obj, cls = None) -> str:
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return (self.get(obj).strip(b'\x20\x00')
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.decode(encoding='ascii', errors='ignore'))
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def __set__(self, obj, value: str) -> None:
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bvalue = value.encode()
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if len(bvalue) > self.bytelen:
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bvalue = bvalue[:self.bytelen]
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bvalue = bvalue.ljust(self.bytelen, self.pad_with)
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self.set(obj, bvalue)
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class DMRPFieldInt(DMRPFieldBase):
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def __init__(self, name: str, offset: int, bytelen: int) -> None:
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super().__init__(name, offset, bytelen)
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self.typename = f"uint{str(bytelen * 8)}"
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def __get__(self, obj, cls = None) -> int:
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return int.from_bytes(self.get(obj), byteorder="big")
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def __set__(self, obj, value: int) -> None:
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if not (0 <= value < 1<<(self.bytelen * 8)):
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raise DMRPFieldOutOfRangeException(self.name, self.typename)
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self.set(obj, value.to_bytes(self.bytelen, byteorder="big"))
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