def test_getter_is_little_endian(self):
"""Test DicomIO.is_little_endian getter"""
fp = DicomIO()
fp.is_little_endian = True
assert fp.is_little_endian
fp.is_little_endian = False
assert not fp.is_little_endian
def _write_dataset(fp: DicomIO, dataset: Dataset,
write_like_original: bool) -> None:
"""Write the Data Set to a file-like. Assumes the file meta information,
if any, has been written.
"""
# if we want to write with the same endianness and VR handling as
# the read dataset we want to preserve raw data elements for
# performance reasons (which is done by get_item);
# otherwise we use the default converting item getter
if dataset.is_original_encoding:
get_item = Dataset.get_item
else:
get_item = Dataset.__getitem__ # type: ignore[assignment]
# WRITE DATASET
# The transfer syntax used to encode the dataset can't be changed
# within the dataset.
# Write any Command Set elements now as elements must be in tag order
# Mixing Command Set with other elements is non-conformant so we
# require `write_like_original` to be True
command_set = get_item(dataset, slice(0x00000000, 0x00010000))
if command_set and write_like_original:
fp.is_implicit_VR = True
fp.is_little_endian = True
write_dataset(fp, command_set)
# Set file VR and endianness. MUST BE AFTER writing META INFO (which
# requires Explicit VR Little Endian) and COMMAND SET (which requires
# Implicit VR Little Endian)
fp.is_implicit_VR = cast(bool, dataset.is_implicit_VR)
fp.is_little_endian = cast(bool, dataset.is_little_endian)
# Write non-Command Set elements now
write_dataset(fp, get_item(dataset, slice(0x00010000, None)))
def test_getter_is_little_endian(self):
"""Test DicomIO.is_little_endian getter"""
fp = DicomIO()
fp.is_little_endian = True
assert fp.is_little_endian
fp.is_little_endian = False
assert not fp.is_little_endian
def test_setter_is_little_endian(self):
"""Test DicomIO.is_little_endian setter"""
fp = DicomIO()
fp.is_little_endian = True
assert fp.read_US == fp.read_leUS
assert fp.read_UL == fp.read_leUL
assert fp.write_US == fp.write_leUS
assert fp.write_UL == fp.write_leUL
assert fp.read_tag == fp.read_le_tag
fp.is_little_endian = False
assert fp.read_US == fp.read_beUS
assert fp.read_UL == fp.read_beUL
assert fp.write_US == fp.write_beUS
assert fp.write_UL == fp.write_beUL
assert fp.read_tag == fp.read_be_tag
def test_setter_is_little_endian(self):
"""Test DicomIO.is_little_endian setter"""
fp = DicomIO()
fp.is_little_endian = True
assert fp.read_US == fp.read_leUS
assert fp.read_UL == fp.read_leUL
assert fp.write_US == fp.write_leUS
assert fp.write_UL == fp.write_leUL
assert fp.read_tag == fp.read_le_tag
fp.is_little_endian = False
assert fp.read_US == fp.read_beUS
assert fp.read_UL == fp.read_beUL
assert fp.write_US == fp.write_beUS
assert fp.write_UL == fp.write_beUL
assert fp.read_tag == fp.read_be_tag
def _harmonize_properties(ds: Dataset, fp: DicomIO) -> None:
"""Make sure the properties in the dataset and the file pointer are
consistent, so the user can set both with the same effect.
Properties set on the destination file object always have preference.
"""
# ensure preference of fp over dataset
if hasattr(fp, 'is_little_endian'):
ds.is_little_endian = fp.is_little_endian
if hasattr(fp, 'is_implicit_VR'):
ds.is_implicit_VR = fp.is_implicit_VR
# write the properties back to have a consistent state
fp.is_implicit_VR = cast(bool, ds.is_implicit_VR)
fp.is_little_endian = cast(bool, ds.is_little_endian)
