def test_permissive_read_with_wrong_machine_stamp(self):
data = np.arange(12, dtype=np.int16).reshape(3, 4)
with self.newmrc(self.temp_mrc_name, mode='w+') as mrc:
mrc.set_data(data)
wrong_byte_order = mrc.header.mode.newbyteorder().dtype.byteorder
mrc.header.machst = utils.machine_stamp_from_byte_order(wrong_byte_order)
with self.assertRaisesRegex(ValueError, "Unrecognised mode"):
self.newmrc(self.temp_mrc_name)
with warnings.catch_warnings(record=True) as w:
warnings.simplefilter("always")
with self.newmrc(self.temp_mrc_name, permissive=True) as mrc:
np.testing.assert_array_equal(mrc.data, data)
assert len(w) == 1
assert "Machine stamp" in str(w[0].message)
assert "byte order" in str(w[0].message)
def test_pretty_machine_stamp(self):
machst = utils.machine_stamp_from_byte_order('<')
assert utils.pretty_machine_stamp(machst) == "0x44 0x44 0x00 0x00"
def test_unknown_byte_order_raises_exception(self):
with self.assertRaisesRegex(ValueError,
"Unrecognised byte order indicator"):
utils.machine_stamp_from_byte_order('|')
def test_native_machine_stamp(self):
machst = utils.machine_stamp_from_byte_order()
if sys.byteorder == 'little':
assert machst == utils.machine_stamp_from_byte_order('<')
else:
assert machst == utils.machine_stamp_from_byte_order('>')
def test_big_endian_machine_stamp(self):
machst = utils.machine_stamp_from_byte_order('>')
assert machst == bytearray((0x11, 0x11, 0x00, 0x00))
def test_little_endian_machine_stamp(self):
machst = utils.machine_stamp_from_byte_order('<')
assert machst == bytearray((0x44, 0x44, 0x00, 0x00))
