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import sys, unittest
from ctypes import *
structures = []
byteswapped_structures = []
if sys.byteorder == "little":
SwappedStructure = BigEndianStructure
else:
SwappedStructure = LittleEndianStructure
for typ in [c_short, c_int, c_long, c_longlong,
c_float, c_double,
c_ushort, c_uint, c_ulong, c_ulonglong]:
class X(Structure):
_pack_ = 1
_fields_ = [("pad", c_byte),
("value", typ)]
class Y(SwappedStructure):
_pack_ = 1
_fields_ = [("pad", c_byte),
("value", typ)]
structures.append(X)
byteswapped_structures.append(Y)
class TestStructures(unittest.TestCase):
def test_native(self):
for typ in structures:
self.assertEqual(typ.value.offset, 1)
o = typ()
o.value = 4
self.assertEqual(o.value, 4)
def test_swapped(self):
for typ in byteswapped_structures:
self.assertEqual(typ.value.offset, 1)
o = typ()
o.value = 4
self.assertEqual(o.value, 4)
if __name__ == '__main__':
unittest.main()