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import py
from ctypes import *
from support import BaseCTypesTestChecker
import os
import ctypes
signed_int_types = (c_byte, c_short, c_int, c_long, c_longlong)
unsigned_int_types = (c_ubyte, c_ushort, c_uint, c_ulong, c_ulonglong)
int_types = unsigned_int_types + signed_int_types
def setup_module(mod):
import conftest
_ctypes_test = str(conftest.sofile)
func = CDLL(_ctypes_test).unpack_bitfields
func.argtypes = POINTER(BITS), c_char
mod.func = func
class BITS(Structure):
_fields_ = [("A", c_int, 1),
("B", c_int, 2),
("C", c_int, 3),
("D", c_int, 4),
("E", c_int, 5),
("F", c_int, 6),
("G", c_int, 7),
("H", c_int, 8),
("I", c_int, 9),
("M", c_short, 1),
("N", c_short, 2),
("O", c_short, 3),
("P", c_short, 4),
("Q", c_short, 5),
("R", c_short, 6),
("S", c_short, 7)]
class TestC:
def test_ints(self):
for i in range(512):
for name in "ABCDEFGHI":
b = BITS()
setattr(b, name, i)
assert (name, i, getattr(b, name)) == (name, i, func(byref(b), name))
def test_shorts(self):
for i in range(256):
for name in "MNOPQRS":
b = BITS()
setattr(b, name, i)
assert (name, i, getattr(b, name)) == (name, i, func(byref(b), name))
class TestBitField:
def test_longlong(self):
class X(Structure):
_fields_ = [("a", c_longlong, 1),
("b", c_longlong, 62),
("c", c_longlong, 1)]
assert sizeof(X) == sizeof(c_longlong)
x = X()
x.a, x.b, x.c = -1, 7, -1
assert (x.a, x.b, x.c) == (-1, 7, -1)
x = X()
x.a, x.b, x.c = -1, -7, -1
assert (x.a, x.b, x.c) == (-1, -7, -1)
def test_ulonglong(self):
class X(Structure):
_fields_ = [("a", c_ulonglong, 1),
("b", c_ulonglong, 62),
("c", c_ulonglong, 1)]
assert sizeof(X) == sizeof(c_longlong)
x = X()
assert (x.a, x.b, x.c) == (0, 0, 0)
x.a, x.b, x.c = 7, 2305843009213693953, 7
assert (x.a, x.b, x.c) == (1, 2305843009213693953, 1)
def test_signed(self):
for c_typ in signed_int_types:
class X(Structure):
_fields_ = [("dummy", c_typ),
("a", c_typ, 3),
("b", c_typ, 3),
("c", c_typ, 1)]
assert sizeof(X) == sizeof(c_typ)*2
x = X()
assert (c_typ, x.a, x.b, x.c) == (c_typ, 0, 0, 0)
x.a = -1
assert (c_typ, x.a, x.b, x.c) == (c_typ, -1, 0, 0)
x.a, x.b = 0, -1
assert (c_typ, x.a, x.b, x.c) == (c_typ, 0, -1, 0)
def test_unsigned(self):
for c_typ in unsigned_int_types:
class X(Structure):
_fields_ = [("a", c_typ, 3),
("b", c_typ, 3),
("c", c_typ, 1)]
assert sizeof(X) == sizeof(c_typ)
x = X()
assert (c_typ, x.a, x.b, x.c) == (c_typ, 0, 0, 0)
x.a = -1
assert (c_typ, x.a, x.b, x.c) == (c_typ, 7, 0, 0)
x.a, x.b = 0, -1
assert (c_typ, x.a, x.b, x.c) == (c_typ, 0, 7, 0)
def fail_fields(self, *fields):
return self.get_except(type(Structure), "X", (),
{"_fields_": fields})
def test_nonint_types(self):
# bit fields are not allowed on non-integer types.
result = self.fail_fields(("a", c_char_p, 1))
assert result == (TypeError, 'bit fields not allowed for type c_char_p')
result = self.fail_fields(("a", c_void_p, 1))
assert result == (TypeError, 'bit fields not allowed for type c_void_p')
if c_int != c_long:
result = self.fail_fields(("a", POINTER(c_int), 1))
assert result == (TypeError, 'bit fields not allowed for type LP_c_int')
result = self.fail_fields(("a", c_char, 1))
assert result == (TypeError, 'bit fields not allowed for type c_char')
try:
c_wchar
except NameError:
pass
else:
result = self.fail_fields(("a", c_wchar, 1))
assert result == (TypeError, 'bit fields not allowed for type c_wchar')
class Dummy(Structure):
_fields_ = []
result = self.fail_fields(("a", Dummy, 1))
assert result == (TypeError, 'bit fields not allowed for type Dummy')
def test_single_bitfield_size(self):
for c_typ in int_types:
result = self.fail_fields(("a", c_typ, -1))
assert result == (ValueError, 'number of bits invalid for bit field')
result = self.fail_fields(("a", c_typ, 0))
assert result == (ValueError, 'number of bits invalid for bit field')
class X(Structure):
_fields_ = [("a", c_typ, 1)]
assert sizeof(X) == sizeof(c_typ)
class X(Structure):
_fields_ = [("a", c_typ, sizeof(c_typ)*8)]
assert sizeof(X) == sizeof(c_typ)
result = self.fail_fields(("a", c_typ, sizeof(c_typ)*8 + 1))
assert result == (ValueError, 'number of bits invalid for bit field')
def test_multi_bitfields_size(self):
class X(Structure):
_fields_ = [("a", c_short, 1),
("b", c_short, 14),
("c", c_short, 1)]
assert sizeof(X) == sizeof(c_short)
class X(Structure):
_fields_ = [("a", c_short, 1),
("a1", c_short),
("b", c_short, 14),
("c", c_short, 1)]
assert sizeof(X) == sizeof(c_short)*3
assert X.a.offset == 0
assert X.a1.offset == sizeof(c_short)
assert X.b.offset == sizeof(c_short)*2
assert X.c.offset == sizeof(c_short)*2
class X(Structure):
_fields_ = [("a", c_short, 3),
("b", c_short, 14),
("c", c_short, 14)]
assert sizeof(X) == sizeof(c_short)*3
assert X.a.offset == sizeof(c_short)*0
assert X.b.offset == sizeof(c_short)*1
assert X.c.offset == sizeof(c_short)*2
def get_except(self, func, *args, **kw):
try:
func(*args, **kw)
except Exception as detail:
import traceback
traceback.print_exc()
return detail.__class__, str(detail)
def test_mixed_1(self):
class X(Structure):
_fields_ = [("a", c_byte, 4),
("b", c_int, 4)]
if os.name in ("nt", "ce"):
assert sizeof(X) == sizeof(c_int)*2
else:
assert sizeof(X) == sizeof(c_int)
def test_mixed_2(self):
class X(Structure):
_fields_ = [("a", c_byte, 4),
("b", c_int, 32)]
assert sizeof(X) == sizeof(c_int)*2
def test_mixed_3(self):
class X(Structure):
_fields_ = [("a", c_byte, 4),
("b", c_ubyte, 4)]
assert sizeof(X) == sizeof(c_byte)
def test_anon_bitfields(self):
# anonymous bit-fields gave a strange error message
class X(Structure):
_fields_ = [("a", c_byte, 4),
("b", c_ubyte, 4)]
class Y(Structure):
_anonymous_ = ["_"]
_fields_ = [("_", X)]
def test_set_fields_attr(self):
class A(Structure):
pass
A._fields_ = [("a", c_byte),
("b", c_ubyte)]
def test_set_fields_attr_bitfields(self):
class A(Structure):
pass
A._fields_ = [("a", POINTER(A)),
("b", c_ubyte, 4)]
def test_set_fields_cycle_fails(self):
class A(Structure):
pass
import pytest
pytest.raises(AttributeError, """
A._fields_ = [("a", A)]
""")
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