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"""
User Datagram Protocol (TCP/IP protocol stack)
"""
from construct import *
import six
from binascii import unhexlify
udp_header = Struct("udp_header",
Value("header_length", lambda ctx: 8),
UBInt16("source"),
UBInt16("destination"),
ExprAdapter(UBInt16("payload_length"),
encoder = lambda obj, ctx: obj + 8,
decoder = lambda obj, ctx: obj - 8,
),
UBInt16("checksum"),
)
if __name__ == "__main__":
cap = unhexlify(six.b("0bcc003500280689"))
obj = udp_header.parse(cap)
print (obj)
print (repr(udp_header.build(obj)))
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