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35 lines
961 B
Python
35 lines
961 B
Python
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import struct
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from .tcpfull import ConnectionTcpFull
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class ConnectionTcpAbridged(ConnectionTcpFull):
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"""
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This is the mode with the lowest overhead, as it will
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only require 1 byte if the packet length is less than
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508 bytes (127 << 2, which is very common).
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"""
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def connect(self, ip, port):
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result = super().connect(ip, port)
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self.conn.write(b'\xef')
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return result
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def clone(self):
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return ConnectionTcpAbridged(self._proxy, self._timeout)
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def recv(self):
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length = struct.unpack('<B', self.read(1))[0]
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if length >= 127:
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length = struct.unpack('<i', self.read(3) + b'\0')[0]
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return self.read(length << 2)
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def send(self, message):
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length = len(message) >> 2
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if length < 127:
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length = struct.pack('B', length)
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else:
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length = b'\x7f' + int.to_bytes(length, 3, 'little')
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self.write(length + message)
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