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34 lines
961 B
Python
34 lines
961 B
Python
import struct
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from .connection import Connection, PacketCodec
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class AbridgedPacketCodec(PacketCodec):
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tag = b'\xef'
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obfuscate_tag = b'\xef\xef\xef\xef'
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def encode_packet(self, data):
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length = len(data) >> 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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return length + data
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async def read_packet(self, reader):
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length = struct.unpack('<B', await reader.readexactly(1))[0]
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if length >= 127:
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length = struct.unpack(
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'<i', await reader.readexactly(3) + b'\0')[0]
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return await reader.readexactly(length << 2)
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class ConnectionTcpAbridged(Connection):
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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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packet_codec = AbridgedPacketCodec
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