206 lines
7.6 KiB
Python
206 lines
7.6 KiB
Python
"""
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Implementation of C# System.Guid
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References:
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https://referencesource.microsoft.com/#mscorlib/system/guid.cs
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# TODO Add License
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"""
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from struct import Struct, pack
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from math import log
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# Constants for masking bytes
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MAXINT64 = 0xFFFFFFFFFFFFFFFF
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MAXINT16 = 0xFFFF
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MAXINT8 = 0xFF
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class Guid:
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"""
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A Global Unique Identifier (Guid) based on the one provided in C#'s System package
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The Guid is stored as a tuple of length 11 for easy processing and comparisons
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Attributes:
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guid (tuple): A tuple containing the guid
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"""
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def __init__(self, *args):
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"""
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Initialize the Guid
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Arguments:
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Union[int, str, bytes, short(int will be masked to short)]:
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The arguments can be in any of the following formats:
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(bytes(len 16))
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(int(len <= 4), short, short, bytes(len 8))
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(int(len <= 8), int(len <= 8))
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(int(len <= 16))
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(str) - str must be formatted 00000000-0000-0000-0000-000000000000
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"""
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# Guid will be stored as a tuple len 11
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if bool(args):
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self.get_guid(args)
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else:
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self.guid = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
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def get_guid(self, args) -> None:
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s = Struct('I2H8B')
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if len(args) == 1 and isinstance(args[0], bytes) and len(args[0]) == 16:
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b = args[0]
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guid = s.pack((int(b[3]) << 24) | (int(b[2]) << 16) | (int(b[1]) << 8) | b[0],
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((int(b[5]) << 8) | b[4]),
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(int(b[7]) << 8) | b[6],
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*b[8:16]
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)
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self.guid = s.unpack(guid)
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elif len(args) == 4 and all(isinstance(arg, int) for arg in args[0:3]) \
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and isinstance(args[3], bytes) and len(args[3]) == 8:
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guid = s.pack(args[0], args[1] & MAXINT16, args[2] & MAXINT16, *args[3])
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self.guid = s.unpack(guid)
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elif len(args) == 2 and all(isinstance(arg, int) for arg in args):
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if all((self.bytes_needed(arg) <= 4) for arg in args):
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int1, int2 = (args[0] << 32), (args[1] & 0xFFFFFFFF)
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id_int = int1 | int2
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b = pack('Q8x', id_int)
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elif all((self.bytes_needed(arg) <= 8) for arg in args):
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b = pack('QQ', args[0], args[1])
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else:
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raise TypeError('Arguments don\'t match any allowed configuration')
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guid = s.pack((int(b[3]) << 24) | (int(b[2]) << 16) | (int(b[1]) << 8) | b[0],
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((int(b[5]) << 8) | b[4]),
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((int(b[7]) << 8) | b[6]),
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*b[8:16]
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)
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self.guid = s.unpack(guid)
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elif len(args) == 1 and isinstance(args[0], int):
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if self.bytes_needed(args[0]) <= 8:
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b = pack('Q8x', args[0])
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else:
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first = (args[0] >> 64) & MAXINT64
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second = args[0] & MAXINT64
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b = pack('QQ', first, second)
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guid = s.pack((int(b[3]) << 24) | (int(b[2]) << 16) | (int(b[1]) << 8) | b[0],
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((int(b[5]) << 8) | b[4]),
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(int(b[7]) << 8) | b[6],
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*b[8:16]
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)
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self.guid = s.unpack(guid)
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elif len(args) == 1 and isinstance(args[0], str) and len(args[0]) == 36:
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self.parse_string(args[0])
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else:
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raise TypeError('Arguments don\'t match any allowed configuration')
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def parse_string(self, string):
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if len(string) == 36:
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if string[8] == '-' and string[13] == '-' and string[18] == '-' and string[23] == '-':
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guid_str = string.split('-')
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try:
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self.guid = (int(guid_str[0], 16),
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int(guid_str[1], 16),
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int(guid_str[2], 16),
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int(guid_str[3], 16) >> 8,
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int(guid_str[3], 16) & MAXINT8,
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int(guid_str[4], 16) >> 40,
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int(guid_str[4], 16) >> 32,
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int(guid_str[4], 16) >> 24,
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int(guid_str[4], 16) >> 16,
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int(guid_str[4], 16) >> 8,
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int(guid_str[4], 16) & MAXINT8,
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)
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except ValueError:
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raise TypeError('String is not formatted properly must be in format '
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'00000000-0000-0000-0000-000000000000')
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def to_string(self):
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output = ''
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output += self.hexs_to_chars(self.guid[0] >> 24, self.guid[0] >> 16)
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output += self.hexs_to_chars(self.guid[0] >> 8, self.guid[0])
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output += '-'
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output += self.hexs_to_chars(self.guid[1] >> 8, self.guid[1])
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output += '-'
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output += self.hexs_to_chars(self.guid[2] >> 8, self.guid[2])
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output += '-'
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output += self.hexs_to_chars(self.guid[3], self.guid[4])
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output += '-'
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output += self.hexs_to_chars(self.guid[5], self.guid[6])
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output += self.hexs_to_chars(self.guid[7], self.guid[8])
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output += self.hexs_to_chars(self.guid[9], self.guid[10])
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return output
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def to_byte_array(self):
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b = bytearray(16)
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b[0] = self.guid[0] & MAXINT8
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b[1] = (self.guid[0] >> 8) & MAXINT8
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b[2] = (self.guid[0] >> 16) & MAXINT8
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b[3] = (self.guid[0] >> 24) & MAXINT8
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b[4] = self.guid[1] & MAXINT8
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b[5] = (self.guid[1] >> 8) & MAXINT8
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b[6] = self.guid[2] & MAXINT8
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b[7] = (self.guid[2] >> 8) & MAXINT8
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b[8] = self.guid[3] & MAXINT8
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b[9] = self.guid[4] & MAXINT8
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b[10] = self.guid[5] & MAXINT8
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b[11] = self.guid[6] & MAXINT8
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b[12] = self.guid[7] & MAXINT8
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b[13] = self.guid[8] & MAXINT8
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b[14] = self.guid[9] & MAXINT8
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b[15] = self.guid[10] & MAXINT8
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return b
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def hexs_to_chars(self, _a, _b):
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out = f'{self.hex_to_char(_a>>4)}{self.hex_to_char(_a)}{self.hex_to_char(_b>>4)}{self.hex_to_char(_b)}'
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return out
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@staticmethod
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def bytes_needed(a):
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if a == 0:
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return 1
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return int(log(a, 256)) + 1
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@staticmethod
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def hex_to_char(a: int):
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a = a & 0xf
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out = chr(a - 10 + 0x61 if a > 9 else a + 0x30)
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return out
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def __hash__(self):
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t = self.guid
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return t[0] ^ ((int(t[1]) << 16) | int(t[2])) ^ ((int(t[5]) << 24) | t[10])
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def __eq__(self, other):
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if other is None or not isinstance(other, Guid):
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return False
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if other.guid[0] != self.guid[0]:
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return False
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if other.guid[1] != self.guid[1]:
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return False
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if other.guid[2] != self.guid[2]:
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return False
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if other.guid[3] != self.guid[3]:
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return False
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if other.guid[4] != self.guid[4]:
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return False
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if other.guid[5] != self.guid[5]:
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return False
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if other.guid[6] != self.guid[6]:
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return False
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if other.guid[7] != self.guid[7]:
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return False
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if other.guid[8] != self.guid[8]:
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return False
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if other.guid[9] != self.guid[9]:
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return False
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if other.guid[10] != self.guid[10]:
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return False
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return True
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def __bool__(self):
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return not (self.guid == (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0))
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def __str__(self):
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return self.to_string()
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def __repr__(self):
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return f'<Guid hash={self.__hash__()}>'
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