def _private_vr_for_tag(ds: Optional["Dataset"], tag: BaseTag) -> str:
"""Return the VR for a known private tag, otherwise "UN".
Parameters
----------
ds : Dataset, optional
The dataset needed for the private creator lookup.
If not given, "UN" is returned.
tag : BaseTag
The private tag to lookup. The caller has to ensure that the
tag is private.
Returns
-------
str
"LO" if the tag is a private creator, the VR of the private tag if
found in the private dictionary, or "UN".
"""
if tag.is_private_creator:
return VR_.LO
# invalid private tags are handled as UN
if ds is not None and (tag.element & 0xff00):
private_creator_tag = tag.group << 16 | (tag.element >> 8)
private_creator = ds.get(private_creator_tag, "")
if private_creator:
try:
return private_dictionary_VR(tag, private_creator.value)
except KeyError:
pass
return VR_.UN
def test_private_dict_VR(self):
"""Test private_dictionary_VR"""
assert private_dictionary_VR(0x00090000, 'ACUSON') == 'IS'
def test_private_dict_VR(self):
"""Test private_dictionary_VR"""
assert private_dictionary_VR(0x00090000, 'ACUSON') == 'IS'