def test_unsupported_syntax_raises(self):
"""Test get_overlay_array raises if unsupported Transfer Syntax."""
ds = dcmread(EXPL_1_1_1F)
ds.file_meta.TransferSyntaxUID = '1.2.840.10008.1.2.4.50'
with pytest.raises(NotImplementedError,
match=r' the transfer syntax is not supported'):
get_overlay_array(ds, 0x6000)
def test_no_overlay_data_raises(self):
"""Test get_overlay_array raises if dataset has no OverlayData."""
ds = dcmread(EXPL_1_1_1F)
del ds[0x6000, 0x3000]
assert (0x6000, 0x3000) not in ds
with pytest.raises(AttributeError, match=r' dataset: OverlayData'):
get_overlay_array(ds, 0x6000)
def test_missing_padding_warns(self):
"""A warning shall be issued if the padding for odd data is missing."""
ds = dcmread(EXPL_1_1_1F)
# Edit shape
ds[0x6000, 0x0010].value = 15 # OverlayRows
ds[0x6000, 0x0011].value = 14 # OverlayColumns
ds[0x6000, 0x3000].value = ds[0x6000, 0x3000].value[:27] # 15 * 14 / 8
msg = r"The overlay data length is odd and misses a padding byte."
with pytest.warns(UserWarning, match=msg):
get_overlay_array(ds, 0x6000)
def test_bad_length_raises(self):
"""Test bad pixel data length raises exception."""
ds = dcmread(EXPL_1_1_1F)
# Too short
ds[0x6000, 0x3000].value = ds[0x6000, 0x3000][:-1]
msg = (
r"The length of the overlay data in the dataset \(29281 bytes\) "
r"doesn't match the expected length \(29282 bytes\). "
r"The dataset may be corrupted or there may be an issue "
r"with the overlay data handler.")
with pytest.raises(ValueError, match=msg):
get_overlay_array(ds, 0x6000)
def test_excess_padding(self):
"""A warning shall be issued excess padding present."""
ds = dcmread(EXPL_1_1_1F)
# Edit shape
ds[0x6000, 0x0010].value = 15 # OverlayRows
ds[0x6000, 0x0011].value = 14 # OverlayColumns
overlay_data = ds[0x6000, 0x3000].value[:27] + b'\x00\x00\x00'
ds[0x6000, 0x3000].value = overlay_data
msg = (
r"overlay data in the dataset \(30 bytes\) indicates it contains "
r"excess padding. 3 bytes will be removed")
with pytest.warns(UserWarning, match=msg):
get_overlay_array(ds, 0x6000)
def test_old_import(self):
"""Test that can import using the old path."""
from pydicom.overlay_data_handlers import numpy_handler as np_old
ds = dcmread(EXPL_1_1_1F)
arr = np_old.get_overlay_array(ds, 0x6000)
assert 0 == arr[0, 0]
