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ctypes seems to work incorrectly with _swappedbytes_ specified.
I.e. it misses some values from buffer:
class X(ctypes.Structure):
 _swappedbytes_ = 1
 _pack_ = 1
 _fields_ = [
 ('a', ctypes.c_ubyte, 4),
 ('b', ctypes.c_ubyte, 4),
 ('c', ctypes.c_ushort, 8),
 ('d', ctypes.c_ushort, 8),
 ]
buf = '\x12\x34\x56\x78'
x = X.from_buffer_copy(buf)
print x.a == 1
print x.b == 2
print x.c == 3
print x.d == 4
This prints
True
True
False
False
Where as four 'True' are expected.