304 lines
7.5 KiB
Python
304 lines
7.5 KiB
Python
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class Bit:
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"""
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Provide a flexible bit representation
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"""
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def __init__(self, var):
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if not isinstance(var, (bool, int, str, Bit)):
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raise TypeError("Bit must be one of type (int, bool, str)")
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if isinstance(var, (int, Bit)):
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if var < 0 or var > 1:
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raise ValueError("Bit must be 0 or 1")
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self.__bit = bool(var)
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elif isinstance(var, str):
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if var == "0" or var == "1":
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self.__bit = bool(int(var))
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else:
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raise ValueError('Bit must be "0" or "1"')
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elif isinstance(var, bool):
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self.__bit = var
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def __str__(self):
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return str(int(self.__bit))
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def __int__(self):
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return int(self.__bit)
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def __bool__(self):
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return self.__bit
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def __repr__(self):
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return f'{self.__class__.__name__}({self.__bit!r})'
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def __eq__(self, compare):
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# Massage compare to bool
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return bool(self) == bool(Bit(compare))
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def __ne__(self, compare):
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return bool(self) != bool(Bit(compare))
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def __lt__(self, compare):
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return bool(self) < bool(Bit(compare))
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def __le__(self, compare):
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return bool(self) <= bool(Bit(compare))
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def __gt__(self, compare):
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return bool(self) > bool(Bit(compare))
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def __ge__(self, compare):
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return bool(self) >= bool(Bit(compare))
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def __get__(self, instance, owner):
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return self.__bit
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def __hash__(self):
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return hash(self.__bit)
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def toggle(self):
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self.__bit = not self.__bit
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@property
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def lie(self):
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"""
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Return the opposite of bit, without changing the bit state
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"""
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return not self.__bit
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class Bits:
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"""
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Provide bit operation helpers.
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"""
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def __init__(self, var=0):
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self.__value = 0
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self.__setvalue(var)
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def __bytes__(self):
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return bytes([self.__value])
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def __bool__(self):
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return bool(int(self))
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def __int__(self):
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return self.__value
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def __repr__(self):
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ret = f'{self.__class__.__module__}.{self.__class__.__name__}'
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ret += f'({bytes(self)})'
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return ret
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def __str__(self):
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return self.bin()
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def __ord__(self):
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return int(self)
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def __index__(self):
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return int(self)
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def __len__(self):
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return 8
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def __eq__(self, compare):
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return int(self) == int(Bits(compare))
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def __ne__(self, compare):
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return int(self) != int(Bits(compare))
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def __lt__(self, compare):
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return int(self) < int(Bits(compare))
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def __le__(self, compare):
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return int(self) <= int(Bits(compare))
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def __gt__(self, compare):
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return int(self) > int(Bits(compare))
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def __ge__(self, compare):
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return int(self) >= int(Bits(compare))
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def __getitem__(self, index):
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return self.list()[index]
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def __setitem__(self, index, value):
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# we'll take the easy way for now
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l = self.list()
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# str->int->bool->int : accept bool, str, int, return either "0" or "1"
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l[index] = bool(int(value))
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self.__setvalue(l)
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def __get__(self, instance, owner):
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return self.bin()
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def __setvalue(self, var):
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self.__value = 0
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if isinstance(var, int):
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if var < 0 or var > 255:
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raise ValueError("Integer must be between 0 and 255")
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self.__value = var
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elif isinstance(var, bytes):
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for _byte in var:
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self.__value += _byte
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if ret > 255 or ret < 0:
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raise ValueError("Sum value of bytes must be between 0"
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" and 255")
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elif (len(var) > 0) and (len(var) <=8):
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for bit in range(0, len(var)):
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self.__value += (int(bool(int(var[bit]))) *
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(2 ** (len(var) - 1 - bit)))
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else:
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raise TypeError("Expected object with len <= 8")
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def bin(self, pad=True, reverse=False):
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bitcount = self.__value.bit_length()
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ret = ""
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if pad and ((bitcount % 8) > 0):
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ret = "0" * (8 - (bitcount % 8))
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ret += bin(self.__value)[2:]
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if reverse:
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ret = ret[::-1]
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return ret
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@property
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def chr(self):
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return chr(self.__value)
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@property
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def byte(self):
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return bytes(self)
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def reverse(self):
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self.__setvalue(self.bin()[::-1])
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@property
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def msb(self):
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return self.bin()[0]
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@property
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def lsb(self):
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return self.bin()[7]
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@property
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def nibble(self):
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return [self.bin()[:4], self.bin()[4:]]
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def list(self, pad=True, reverse=False):
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ret = []
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bits = self.bin(pad=pad, reverse=reverse)
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for bit in bits:
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ret.append(bool(int(bit)))
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return ret
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class Bytes(bytearray):
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def __init__(self, b, *args, **kwargs):
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self.__raw = bytearray(b)
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def __bytes__(self):
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return bytes(self.__raw)
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def __int__(self):
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return self.int()
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def __repr__(self):
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ret = f'{self.__class__.__module__}.{self.__class__.__name__}'
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ret += f'({bytes(self)})'
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return ret
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def __index__(self):
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return self.int()
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def __getitem__(self, index):
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if not isinstance(index, int):
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raise TypeError
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return Bits(self.__raw[index])
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def __setitem__(self, index, value):
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if not isinstance(index, int):
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raise TypeError
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self.__raw[index] = int(value)
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def __delitem__(self, index):
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del self.__raw[index]
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def __test_key(self, key):
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if not isinstance(key, int):
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raise TypeError
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if key >= len(self.__raw):
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raise IndexError
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return True
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def __eq__(self, compare):
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return int(self) == int(compare)
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def __ne__(self, compare):
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return int(self) != int(compare)
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def __lt__(self, compare):
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return int(self) < int(compare)
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def __le__(self, compare):
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return int(self) <= int(compare)
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def __gt__(self, compare):
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return int(self) > int(compare)
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def __ge__(self, compare):
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return int(self) >= int(compare)
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def __hash__(self):
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return None
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def __bool__(self):
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return bool(int(self))
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def __len__(self):
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return len(self.__raw)
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def __get__(self, instance, owner=None):
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return self.__raw
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def __str__(self):
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return self.bin()
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def int(self, _bytes=None, byteorder="big", signed=False):
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if _bytes is None:
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_bytes = bytes(self)
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return int.from_bytes(bytes=_bytes, byteorder=byteorder,
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signed=signed)
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def bin(self, i=None, pad=True):
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if i is None:
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i = self.int()
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bitcount = i.bit_length()
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ret = ""
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if pad and ((bitcount % 8) > 0):
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ret = "0" * (8 - (bitcount % 8))
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chop = 2
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if i < 0:
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# account for the sign character
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chop += 1
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return ret + bin(i)[chop:]
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@property
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def bytes(self):
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return bytes(self)
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@property
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def bytearray(self):
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return bytearray(bytes(self))
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def from_int(self, i, byteorder="big"):
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signed = False
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if i < 0:
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signed = True
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length = (len(self.bin(i=i, pad=True)) / 8)
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return i.to_bytes(length=length,
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byteorder=byteorder,
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signed=signed)
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