def test_shifted() -> None:
struct_t = create_struct(
'SomeStruct', {
'field1': shifted(UInt8, 1),
'field2': UInt16,
'field3': shifted(UInt16, 3),
})
assert sizeof(struct_t) == 9
assert sizeof(struct_t['field1']) == 1
assert sizeof(struct_t['field2']) == 2
assert sizeof(struct_t['field3']) == 2
assert offsetof(struct_t, 'field1') == 1
assert offsetof(struct_t, 'field2') == 2
assert offsetof(struct_t, 'field3') == 7
data = struct_t((0x12, 0x3456, 0x789a))
assert bytes(data) == b'\x00\x12\x56\x34\x00\x00\x00\x9a\x78'
def test_modifiers_classvar() -> None:
struct_t = create_struct(
'SomeStruct', {
'field1': padded(shifted(UInt8, 2), 2),
'_pad': Padding(1),
'field2': shifted(UInt16, 2),
'field3': UInt16(),
})
assert sizeof(struct_t) == 12
assert sizeof(struct_t['field1']) == 1
assert sizeof(struct_t['field2']) == 2
assert sizeof(struct_t['field3']) == 2
assert offsetof(struct_t, 'field1') == 2
assert offsetof(struct_t, 'field2') == 8
assert offsetof(struct_t, 'field3') == 10
data = struct_t((0x12, 0x3456, 0x789a))
assert bytes(data) == b'\x00\x00\x12\x00\x00\x00\x00\x00\x56\x34\x9a\x78'
def test_shifted() -> None:
child1_t = create_struct('Child1', {
'field1_1': UInt16,
'field1_2': UInt8,
'field1_3': UInt8,
})
child2_t = create_struct('Child2', {
'field2_1': UInt8,
'field2_2': UInt16,
'field2_3': UInt8,
})
data_t = create_union(
'Data', {
'child1': child1_t,
'child2': shifted(child2_t, 1),
'child3': shifted(UInt16, 1),
})
assert sizeof(data_t) == 5
assert offsetof(data_t, 'child1') == 0
assert offsetof(data_t, 'child2') == 1
assert offsetof(data_t, 'child3') == 1
data: Any = data_t(0)
child1 = data['child1']
data['child2']['field2_1'] = 0x12
assert child1['field1_1'] == 0x1200
assert data['child3'] == 0x12
assert bytes(data) == b'\x00\x12\x00\x00\x00'
child1['field1_2'] = 0x34
assert data['child2']['field2_2'] == 0x34
assert data['child3'] == 0x3412
assert bytes(data) == b'\x00\x12\x34\x00\x00'
child1['field1_1'] = 0x5678
assert data['child2']['field2_1'] == 0x56
assert data['child3'] == 0x3456
assert bytes(data) == b'\x78\x56\x34\x00\x00'
def test_struct_modified_member_dynamic() -> None:
struct_t = create_struct(
'SomeStruct', {
'field1': shifted(Array(UInt16, 3), 1),
'field2': padded(Array(UInt8, 3), 2),
})
assert sizeof(struct_t) == 12
assert sizeof(struct_t['field1']) == 6
assert sizeof(struct_t['field2']) == 3
assert offsetof(struct_t, 'field1') == 1
assert offsetof(struct_t, 'field2') == 7
data = struct_t(((0x1122, 0x3344, 0x5566), (0x77, 0x88, 0x99)))
assert bytes(data) == b'\x00\x22\x11\x44\x33\x66\x55\x77\x88\x99\x00\x00'
class Data(Union):
child1 = Child1()
child2 = shifted(Child2, 1)
child3 = shifted(UInt16, 1)
class SomeStruct(Struct):
field1 = shifted('bad value', 2) # type: ignore
field2 = UInt16()
class SomeStruct(Struct):
field1 = shifted(Array(UInt16, 3), 1)
field2 = padded(Array(UInt8, 3), 2)
class SomeStruct(Struct):
field1 = padded(shifted(UInt8, 2), 2)
_pad = Padding(1)
field2 = shifted(padded(UInt16, 1), 1)
field3 = UInt16()
class SomeStruct(Struct):
field1 = shifted(UInt8, 1)
field2 = UInt16()
field3 = shifted(UInt16, 3)