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- import struct
- class APCI:
- START = 0x68
- def __init__(self, length=0, send_seq=0, recv_seq=0):
- self.length = length
- self.send_seq = send_seq
- self.recv_seq = recv_seq
- def pack(self):
- return struct.pack('!BBHH', self.START, self.length, self.send_seq << 1, self.recv_seq << 1)
- @classmethod
- def unpack(cls, data):
- if len(data) < 6 or data[0] != cls.START:
- return None
- length = data[1]
- send_seq = (struct.unpack('!H', data[2:4])[0]) >> 1
- recv_seq = (struct.unpack('!H', data[4:6])[0]) >> 1
- return cls(length, send_seq, recv_seq)
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