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39 lines
1.1 KiB
39 lines
1.1 KiB
import bz2
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import io
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from a2s.byteio import ByteReader
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class A2SFragment:
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def __init__(self, message_id, fragment_count, fragment_id, mtu,
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decompressed_size=0, crc=0, payload=b""):
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self.message_id = message_id
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self.fragment_count = fragment_count
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self.fragment_id = fragment_id
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self.mtu = mtu
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self.decompressed_size = decompressed_size
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self.crc = crc
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self.payload = payload
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@property
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def is_compressed(self):
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return bool(self.message_id & (1 << 15))
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def decode_fragment(data):
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reader = ByteReader(
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io.BytesIO(data), endian="<", encoding="utf-8")
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frag = A2SFragment(
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message_id=reader.read_uint32(),
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fragment_count=reader.read_uint8(),
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fragment_id=reader.read_uint8(),
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mtu=reader.read_uint16()
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)
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if frag.is_compressed:
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frag.decompressed_size = reader.read_uint32()
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frag.crc = reader.read_uint32()
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frag.payload = bz2.decompress(reader.read())
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else:
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frag.payload = reader.read()
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return frag
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