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try:
import uctypes
except ImportError:
print("SKIP")
raise SystemExit
desc = {
# arr is array at offset 0, of UINT8 elements, array size is 2
"arr": (uctypes.ARRAY | 0, uctypes.UINT8 | 2),
# arr2 is array at offset 0, size 2, of structures defined recursively
"arr2": (uctypes.ARRAY | 0, 2, {"b": uctypes.UINT8 | 0}),
"arr3": (uctypes.ARRAY | 2, uctypes.UINT16 | 2),
"arr4": (uctypes.ARRAY | 0, 2, {"b": uctypes.UINT8 | 0, "w": uctypes.UINT16 | 1}),
"sub": (
0,
{
"b1": uctypes.BFUINT8 | 0 | 4 << uctypes.BF_POS | 4 << uctypes.BF_LEN,
"b2": uctypes.BFUINT8 | 0 | 0 << uctypes.BF_POS | 4 << uctypes.BF_LEN,
},
),
}
data = bytearray(b"01234567")
S = uctypes.struct(uctypes.addressof(data), desc, uctypes.LITTLE_ENDIAN)
print(uctypes.sizeof(S.arr))
assert uctypes.sizeof(S.arr) == 2
print(uctypes.sizeof(S.arr2))
assert uctypes.sizeof(S.arr2) == 2
print(uctypes.sizeof(S.arr3))
try:
print(uctypes.sizeof(S.arr3[0]))
except TypeError:
print("TypeError")
print(uctypes.sizeof(S.arr4))
assert uctypes.sizeof(S.arr4) == 6
print(uctypes.sizeof(S.sub))
assert uctypes.sizeof(S.sub) == 1
# invalid descriptor
try:
print(uctypes.sizeof([]))
except TypeError:
print("TypeError")
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