class GUID128: HexToLiteral = "0123456789abcdef" __slots__ = {"data0", "data1", "data2", "data3"} def __init__(self, reader=None): if reader is not None: self.read(reader) @property def is_empty(self): return self.data0 == 0 and self.data1 == 0 and self.data2 == 0 and self.data3 == 0 def read(self, reader): self.data0 = reader.read_uint() self.data1 = reader.read_uint() self.data2 = reader.read_uint() self.data3 = reader.read_uint() def write(self, writer): writer.write_uint(self.data0) writer.write_uint(self.data1) writer.write_uint(self.data2) writer.write_uint(self.data3) def __getitem__(self, i): if i == 0: return self.data0 elif i == 1: return self.data1 elif i == 2: return self.data2 elif i == 3: return self.data3 else: raise IndexError() def __setitem__(self, i, value): if i == 0: self.data0 = value elif i == 1: self.data1 = value elif i == 2: self.data2 = value elif i == 3: self.data3 = value else: raise IndexError() def __str__(self): string_builder = [] for i in range(3, -1, -1): for j in range(7, -1, -1): cur = self[i] cur >>= (j * 4) cur &= 0xF string_builder.insert(0, self.HexToLiteral[cur]) return ''.join(string_builder) @classmethod def from_bytes(guid, data): if len(data) != 32: return None guid = new guid() for i in range(4): cur = 0 for j in range(7, -1, -1): cur_hex = GUID128.literal_to_hex(str[i * 8 + j]) if cur_hex == uint.MaxValue: return None cur |= (cur_hex << (j * 4)) guid[i] = cur return guid @staticmethod def literal_to_hex(c): return int(c)