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I_set_sw function is missing a SWAP_INT.
This leads to wrong set of bitfield value.
Here is a script to reproduce:
----------
from ctypes import *
class HEADER(BigEndianStructure):
 _fields_ = ( ('pad', c_uint32, 16),
 ('v1', c_uint32, 4),
 ('v2', c_uint32, 12)
 )
b = bytearray(4)
header = HEADER.from_buffer(b)
header.type = 1
assert b == b'\x00\x00\x10\x00'
header.mode = 0x234
assert b == b'\x00\x00\x12\x34'
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