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import zlib
import struct
class ZippedMsg:
MSG_COMPRESS_THRESHOLD = 256
MSG_COMPRESS_HEADER_MAGIC = 0xABE85CEA
def check_threshold (self, msg):
return len(msg) >= self.MSG_COMPRESS_THRESHOLD
def compress (self, msg):
# compress
compressed = zlib.compress(msg)
new_msg = struct.pack(">II", self.MSG_COMPRESS_HEADER_MAGIC, len(msg)) + compressed
return new_msg
def decompress (self, msg):
if len(msg) < 8:
return None
t = struct.unpack(">II", msg[:8])
if (t[0] != self.MSG_COMPRESS_HEADER_MAGIC):
return None
x = zlib.decompress(msg[8:])
if len(x) != t[1]:
return None
return x
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