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ctypes: add tests for packed bitfields 

Signed-off-by: Filipe Laíns <lains@archlinux.org>
This commit is contained in:
Filipe Laíns 2020-05-02 01:50:23 +01:00
parent 159f35a6b6
commit a0de97dd90
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1 changed files with 72 additions and 0 deletions
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72
Lib/ctypes/test/test_bitfields.py
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@ -233,6 +233,78 @@ class BitFieldTest(unittest.TestCase):
else: else:
self.assertEqual(sizeof(X), sizeof(c_int) * 2) self.assertEqual(sizeof(X), sizeof(c_int) * 2)
@unittest.skipIf(os.name == 'nt', reason='Posix only')
def test_packed_posix(self):
test_cases = {
(
("a", c_uint8, 4),
("b", c_uint8, 4),
): 1,
(
("a", c_uint8, 1),
("b", c_uint16, 1),
("c", c_uint32, 1),
("d", c_uint64, 1),
): 1,
(
("a", c_uint8, 8),
("b", c_uint16, 1),
("c", c_uint32, 1),
("d", c_uint64, 1),
): 2,
(
("a", c_uint32, 9),
("b", c_uint16, 10),
("c", c_uint32, 25),
("d", c_uint64, 1),
): 6,
(
("a", c_uint32, 9),
("b", c_uint16, 10),
("c", c_uint32, 25),
("d", c_uint64, 5),
): 7,
(
("a", c_uint16),
("b", c_uint16, 9),
("c", c_uint16, 1),
("d", c_uint16, 1),
("e", c_uint16, 1),
("f", c_uint16, 1),
("g", c_uint16, 3),
("h", c_uint32, 10),
("i", c_uint32, 20),
("j", c_uint32, 2),
): 8,
(
("a", c_uint16, 9),
("b", c_uint16, 10),
("d", c_uint16),
("c", c_uint8, 8),
): 6,
(
("a", c_uint32, 9),
("b", c_uint32),
("c", c_uint32, 8),
): 7,
}
for fields, size in test_cases.items():
with self.subTest(fields=fields):
class X(Structure):
_pack_ = 1
_fields_ = list(fields)
self.assertEqual(sizeof(X), size)
def test_packed_8(self):
class X(Structure):
_pack_ = 1
_fields_ = [("a", c_uint32, 9),
("b", c_uint32),
("c", c_uint32, 8)]
if os.name != "nt":
self.assertEqual(sizeof(X), 7)
def test_anon_bitfields(self): def test_anon_bitfields(self):
# anonymous bit-fields gave a strange error message # anonymous bit-fields gave a strange error message
class X(Structure): class X(Structure):