def test_read_bad_value_in_VR_enforce_valid_value(self):
pydicom.config.enforce_valid_values = True
# found a conversion
assert '1A' == convert_value('SH', self.tag)
# invalid literal for base 10
with pytest.raises(ValueError):
convert_value('IS', self.tag)
def test_read_bad_value_in_VR_enforce_valid_value(self,
enforce_valid_values):
# found a conversion
assert "1A" == convert_value("SH", self.tag)
# invalid literal for base 10
with pytest.raises(ValueError):
convert_value("IS", self.tag)
def test_read_bad_value_in_VR_default(self, allow_invalid_values):
# found a conversion
assert "1A" == convert_value("SH", self.tag)
# converted with fallback vr "SH"
assert "1A" == convert_value("IS", self.tag)
pydicom.values.convert_retry_VR_order = ["FL", "UL"]
# no fallback VR succeeded, returned original value untranslated
assert b"1A" == convert_value("IS", self.tag)
def test_read_bad_value_in_VR_default(self):
# found a conversion
assert '1A' == convert_value('SH', self.tag)
# converted with fallback vr "SH"
assert '1A' == convert_value('IS', self.tag)
pydicom.values.convert_retry_VR_order = ['FL', 'UL']
# no fallback VR succeeded, returned original value untranslated
assert b'1A' == convert_value('IS', self.tag)
def testReadBadValueInVRDefault(self):
# found a conversion
self.assertEqual('1A', convert_value('SH', self.tag))
# converted with fallback vr "SH"
self.assertEqual('1A', convert_value('IS', self.tag))
pydicom.values.convert_retry_VR_order = ['FL', 'UL']
# no fallback VR succeeded, returned original value untranslated
self.assertEqual(b'1A', convert_value('IS', self.tag))
def test_convert_value_raises(self):
"""Test convert_value raises exception if unsupported VR"""
converter_func = converters['PN']
del converters['PN']
with pytest.raises(NotImplementedError,
match="Unknown Value Representation 'PN'"):
convert_value('PN', None)
# Fix converters
converters['PN'] = converter_func
assert 'PN' in converters
def fix_mismatch_callback(raw_elem, **kwargs):
try:
values.convert_value(raw_elem.VR, raw_elem)
except ValueError:
for vr in kwargs['with_VRs']:
try:
values.convert_value(vr, raw_elem)
except ValueError:
pass
else:
raw_elem = raw_elem._replace(VR=vr)
return raw_elem
def test_convert_value_raises(self):
"""Test convert_value raises exception if unsupported VR"""
converter_func = converters['PN']
del converters['PN']
with pytest.raises(NotImplementedError,
match="Unknown Value Representation 'PN'"):
convert_value('PN', None)
# Fix converters
converters['PN'] = converter_func
assert 'PN' in converters
def fix_mismatch_callback(raw_elem, **kwargs):
try:
values.convert_value(raw_elem.VR, raw_elem)
except ValueError:
for vr in kwargs['with_VRs']:
try:
values.convert_value(vr, raw_elem)
except ValueError:
pass
else:
raw_elem = raw_elem._replace(VR=vr)
return raw_elem
def fix_mismatch_callback(raw_elem, **kwargs):
try:
values.convert_value(raw_elem.VR, raw_elem)
except TypeError:
for vr in kwargs['with_VRs']:
try:
values.convert_value(vr, raw_elem)
except TypeError:
pass
else:
raw_elem = raw_elem._replace(VR=vr)
break # i want to exit immediately after change is applied
return raw_elem
def testEmptyItem(self):
"""Read sequence with a single empty item..............................."""
# This is fix for issue 27
hexstr = (
"08 00 32 10" # (0008, 1032) SQ "Procedure Code Sequence"
" 08 00 00 00" # length 8
" fe ff 00 e0" # (fffe, e000) Item Tag
" 00 00 00 00" # length = 0
) + ( # --------------- end of Sequence
" 08 00 3e 10" # (0008, 103e) LO "Series Description" nopep8
" 0c 00 00 00" # length nopep8
" 52 20 41 44 44 20 56 49 45 57 53 20" # value nopep8
)
# "\x08\x00\x32\x10\x08\x00\x00\x00\xfe\xff\x00\xe0\x00\x00\x00\x00" # from issue 27, procedure code sequence (0008,1032)
# hexstr += "\x08\x00\x3e\x10\x0c\x00\x00\x00\x52\x20\x41\x44\x44\x20\x56\x49\x45\x57\x53\x20" # data element following
fp = BytesIO(hex2bytes(hexstr))
gen = data_element_generator(fp, is_implicit_VR=True, is_little_endian=True)
raw_seq = next(gen)
seq = convert_value("SQ", raw_seq)
self.assertTrue(isinstance(seq, Sequence), "Did not get Sequence, got type {0}".format(str(type(seq))))
self.assertTrue(len(seq) == 1, "Expected Sequence with single (empty) item, got {0:d} item(s)".format(len(seq)))
self.assertTrue(len(seq[0]) == 0, "Expected the sequence item (dataset) to be empty")
elem2 = next(gen)
self.assertEqual(elem2.tag, 0x0008103e, "Expected a data element after empty sequence item")
def testEmptyItem(self):
"""Read sequence with a single empty item..."""
# This is fix for issue 27
hexstr = (
"08 00 32 10" # (0008, 1032) SQ "Procedure Code Sequence"
" 08 00 00 00" # length 8
" fe ff 00 e0" # (fffe, e000) Item Tag
" 00 00 00 00" # length = 0
) + ( # --------------- end of Sequence
" 08 00 3e 10" # (0008, 103e) LO "Series Description" nopep8
" 0c 00 00 00" # length nopep8
" 52 20 41 44 44 20 56 49 45 57 53 20" # value nopep8
)
# "\x08\x00\x32\x10\x08\x00\x00\x00\xfe\xff\x00\xe0\x00\x00\x00\x00"
# from issue 27, procedure code sequence (0008,1032)
# hexstr += "\x08\x00\x3e\x10\x0c\x00\x00\x00\x52\x20
# \x41\x44\x44\x20\x56\x49\x45\x57\x53\x20"
# data element following
fp = BytesIO(hex2bytes(hexstr))
gen = data_element_generator(fp,
is_implicit_VR=True,
is_little_endian=True)
raw_seq = next(gen)
seq = convert_value("SQ", raw_seq)
assert isinstance(seq, Sequence)
assert 1 == len(seq)
assert 0 == len(seq[0])
elem2 = next(gen)
assert 0x0008103e == elem2.tag
def DataElement_from_raw(raw_data_element, encoding=None):
"""Return a DataElement from a RawDataElement"""
from pydicom.values import convert_value # XXX buried here to avoid circular import filereader->Dataset->convert_value->filereader (for SQ parsing)
raw = raw_data_element
# If user has hooked into conversion of raw values, call his/her routine
if config.data_element_callback:
raw = config.data_element_callback(
raw_data_element, **config.data_element_callback_kwargs)
VR = raw.VR
if VR is None: # Can be if was implicit VR
try:
VR = dictionaryVR(raw.tag)
except KeyError:
if raw.tag.is_private:
VR = 'OB' # just read the bytes, no way to know what they mean
elif raw.tag.element == 0: # group length tag implied in versions < 3.0
VR = 'UL'
else:
raise KeyError(
"Unknown DICOM tag {0:s} - can't look up VR".format(
str(raw.tag)))
try:
value = convert_value(VR, raw, encoding)
except NotImplementedError as e:
raise NotImplementedError("{0:s} in tag {1!r}".format(str(e), raw.tag))
return DataElement(raw.tag,
VR,
value,
raw.value_tell,
raw.length == 0xFFFFFFFF,
already_converted=True)
def fix_mismatch_callback(raw_elem: "RawDataElement",
**kwargs: Any) -> "RawDataElement":
if raw_elem.VR is None:
return raw_elem
try:
values.convert_value(raw_elem.VR, raw_elem)
except ValueError:
for vr in kwargs['with_VRs']:
try:
values.convert_value(vr, raw_elem)
except ValueError:
pass
else:
raw_elem = raw_elem._replace(VR=vr)
return raw_elem
def DataElement_from_raw(raw_data_element, encoding=None):
"""Return a DataElement from a RawDataElement"""
from pydicom.values import convert_value # XXX buried here to avoid circular import filereader->Dataset->convert_value->filereader (for SQ parsing)
raw = raw_data_element
# If user has hooked into conversion of raw values, call his/her routine
if config.data_element_callback:
raw = config.data_element_callback(raw_data_element,
**config.data_element_callback_kwargs)
VR = raw.VR
if VR is None: # Can be if was implicit VR
try:
VR = dictionaryVR(raw.tag)
except KeyError:
if raw.tag.is_private:
VR = 'OB' # just read the bytes, no way to know what they mean
elif raw.tag.element == 0: # group length tag implied in versions < 3.0
VR = 'UL'
else:
raise KeyError("Unknown DICOM tag {0:s} - can't look up VR".format(str(raw.tag)))
try:
value = convert_value(VR, raw, encoding)
except NotImplementedError as e:
raise NotImplementedError("{0:s} in tag {1!r}".format(str(e), raw.tag))
return DataElement(raw.tag, VR, value, raw.value_tell,
raw.length == 0xFFFFFFFF, already_converted=True)
def DataElement_from_raw(raw_data_element, encoding=None):
"""Return a :class:`DataElement` created from `raw_data_element`.
Parameters
----------
raw_data_element : RawDataElement namedtuple
The raw data to convert to a :class:`DataElement`.
encoding : str, optional
The character encoding of the raw data.
Returns
-------
DataElement
"""
# XXX buried here to avoid circular import
# filereader->Dataset->convert_value->filereader
# (for SQ parsing)
if in_py2:
encoding = encoding or default_encoding
from pydicom.values import convert_value
raw = raw_data_element
# If user has hooked into conversion of raw values, call his/her routine
if config.data_element_callback:
data_elem = config.data_element_callback
raw = data_elem(raw_data_element,
**config.data_element_callback_kwargs)
VR = raw.VR
if VR is None: # Can be if was implicit VR
try:
VR = dictionary_VR(raw.tag)
except KeyError:
# just read the bytes, no way to know what they mean
if raw.tag.is_private:
# for VR for private tags see PS3.5, 6.2.2
if raw.tag.is_private_creator:
VR = 'LO'
else:
VR = 'UN'
# group length tag implied in versions < 3.0
elif raw.tag.element == 0:
VR = 'UL'
else:
msg = "Unknown DICOM tag {0:s}".format(str(raw.tag))
msg += " can't look up VR"
raise KeyError(msg)
try:
value = convert_value(VR, raw, encoding)
except NotImplementedError as e:
raise NotImplementedError("{0:s} in tag {1!r}".format(str(e), raw.tag))
if raw.tag in _LUT_DESCRIPTOR_TAGS and value[0] < 0:
# We only fix the first value as the third value is 8 or 16
value[0] += 65536
return DataElement(raw.tag, VR, value, raw.value_tell,
raw.length == 0xFFFFFFFF, already_converted=True)
def fix_mismatch_callback(raw_elem, **kwargs):
try:
if raw_elem.VR:
values.convert_value(raw_elem.VR, raw_elem)
except TypeError as err:
logging.error(err)
except BaseException as err:
for vr in kwargs['with_VRs']:
try:
values.convert_value(vr, raw_elem)
except ValueError:
pass
except TypeError:
continue
else:
raw_elem = raw_elem._replace(VR=vr)
return raw_elem
def DataElement_from_raw(raw_data_element, encoding=None):
"""Return a DataElement created from the data in `raw_data_element`.
Parameters
----------
raw_data_element : RawDataElement namedtuple
The raw data to convert to a DataElement
encoding : str
The encoding of the raw data
Returns
-------
pydicom.dataelem.DataElement
"""
# XXX buried here to avoid circular import
# filereader->Dataset->convert_value->filereader
# (for SQ parsing)
if in_py2:
encoding = encoding or default_encoding
from pydicom.values import convert_value
raw = raw_data_element
# If user has hooked into conversion of raw values, call his/her routine
if config.data_element_callback:
data_elem = config.data_element_callback
raw = data_elem(raw_data_element,
**config.data_element_callback_kwargs)
VR = raw.VR
if VR is None: # Can be if was implicit VR
try:
VR = dictionary_VR(raw.tag)
except KeyError:
# just read the bytes, no way to know what they mean
if raw.tag.is_private:
VR = 'OB'
# group length tag implied in versions < 3.0
elif raw.tag.element == 0:
VR = 'UL'
else:
msg = "Unknown DICOM tag {0:s}".format(str(raw.tag))
msg += " can't look up VR"
raise KeyError(msg)
try:
value = convert_value(VR, raw, encoding)
except NotImplementedError as e:
raise NotImplementedError("{0:s} in tag {1!r}".format(str(e), raw.tag))
return DataElement(raw.tag,
VR,
value,
raw.value_tell,
raw.length == 0xFFFFFFFF,
already_converted=True)
def DataElement_from_raw(raw_data_element, encoding=None):
"""Return a DataElement created from the data in `raw_data_element`.
Parameters
----------
raw_data_element : RawDataElement namedtuple
The raw data to convert to a DataElement
encoding : str
The encoding of the raw data
Returns
-------
pydicom.dataelem.DataElement
"""
# XXX buried here to avoid circular import
# filereader->Dataset->convert_value->filereader
# (for SQ parsing)
if in_py2:
encoding = encoding or default_encoding
from pydicom.values import convert_value
raw = raw_data_element
# If user has hooked into conversion of raw values, call his/her routine
if config.data_element_callback:
data_elem = config.data_element_callback
raw = data_elem(raw_data_element,
**config.data_element_callback_kwargs)
VR = raw.VR
if VR is None: # Can be if was implicit VR
try:
VR = dictionary_VR(raw.tag)
except KeyError:
# just read the bytes, no way to know what they mean
if raw.tag.is_private:
# for VR for private tags see PS3.5, 6.2.2
if raw.tag.is_private_creator:
VR = 'LO'
else:
VR = 'UN'
# group length tag implied in versions < 3.0
elif raw.tag.element == 0:
VR = 'UL'
else:
msg = "Unknown DICOM tag {0:s}".format(str(raw.tag))
msg += " can't look up VR"
raise KeyError(msg)
try:
value = convert_value(VR, raw, encoding)
except NotImplementedError as e:
raise NotImplementedError("{0:s} in tag {1!r}".format(str(e), raw.tag))
return DataElement(raw.tag, VR, value, raw.value_tell,
raw.length == 0xFFFFFFFF, already_converted=True)
def testImplVRBigEndian_ExplicitLengthSeq(self):
"""Raw read: ImplVR BigEndian SQ with explicit lengths..."""
# Create a fictional sequence with bytes directly,
# similar to PS 3.5-2008 Table 7.5-1 p42
hexstr = (
"30 0a 00 B0" # (300a, 00b0) Beam Sequence
" 00 00 00 40" # length
" ff fe e0 00" # (fffe, e000) Item Tag
" 00 00 00 18" # Item (dataset) Length
" 30 0a 00 c0" # (300A, 00C0) Beam Number
" 00 00 00 02" # length
" 31 20" # value '1 '
" 30 0a 00 c2" # (300A, 00C2) Beam Name
" 00 00 00 06" # length
" 42 65 61 6d 20 31" # value 'Beam 1'
# -------------
" ff fe e0 00" # (fffe, e000) Item Tag
" 00 00 00 18" # Item (dataset) Length
" 30 0a 00 c0" # (300A, 00C0) Beam Number
" 00 00 00 02" # length
" 32 20" # value '2 '
" 30 0a 00 c2" # (300A, 00C2) Beam Name
" 00 00 00 06" # length
" 42 65 61 6d 20 32" # value 'Beam 2'
)
infile = BytesIO(hex2bytes(hexstr))
de_gen = data_element_generator(infile,
is_implicit_VR=True,
is_little_endian=False)
raw_seq = next(de_gen)
seq = convert_value("SQ", raw_seq)
# The sequence is parsed, but only into raw data elements.
# They will be converted when asked for. Check some:
got = seq[0].BeamNumber
self.assertTrue(got == 1,
"Expected Beam Number 1, got {0!r}".format(got))
got = seq[1].BeamName
self.assertTrue(got == 'Beam 2',
"Expected Beam Name 'Beam 2', got {0:s}".format(got))
def testImplVRBigEndian_ExplicitLengthSeq(self):
"""Raw read: ImplVR BigEndian SQ with explicit lengths..."""
# Create a fictional sequence with bytes directly,
# similar to PS 3.5-2008 Table 7.5-1 p42
hexstr = (
"30 0a 00 B0" # (300a, 00b0) Beam Sequence
" 00 00 00 40" # length
" ff fe e0 00" # (fffe, e000) Item Tag
" 00 00 00 18" # Item (dataset) Length
" 30 0a 00 c0" # (300A, 00C0) Beam Number
" 00 00 00 02" # length
" 31 20" # value '1 '
" 30 0a 00 c2" # (300A, 00C2) Beam Name
" 00 00 00 06" # length
" 42 65 61 6d 20 31" # value 'Beam 1'
# -------------
" ff fe e0 00" # (fffe, e000) Item Tag
" 00 00 00 18" # Item (dataset) Length
" 30 0a 00 c0" # (300A, 00C0) Beam Number
" 00 00 00 02" # length
" 32 20" # value '2 '
" 30 0a 00 c2" # (300A, 00C2) Beam Name
" 00 00 00 06" # length
" 42 65 61 6d 20 32" # value 'Beam 2'
)
infile = BytesIO(hex2bytes(hexstr))
de_gen = data_element_generator(infile,
is_implicit_VR=True,
is_little_endian=False)
raw_seq = next(de_gen)
seq = convert_value("SQ", raw_seq)
# The sequence is parsed, but only into raw data elements.
# They will be converted when asked for. Check some:
got = seq[0].BeamNumber
self.assertTrue(got == 1,
"Expected Beam Number 1, got {0!r}".format(got))
got = seq[1].BeamName
self.assertTrue(got == 'Beam 2',
"Expected Beam Name 'Beam 2', got {0:s}".format(got))
def testImplVRLittleEndian_ExplicitLengthSeq(self):
"""Raw read: ImplVR Little Endian SQ with explicit lengths..."""
# Create a fictional sequence with bytes directly,
# similar to PS 3.5-2008 Table 7.5-1 p42
hexstr = (
"0a 30 B0 00" # (300a, 00b0) Beam Sequence
" 40 00 00 00" # length
" fe ff 00 e0" # (fffe, e000) Item Tag
" 18 00 00 00" # Item (dataset) Length
" 0a 30 c0 00" # (300A, 00C0) Beam Number
" 02 00 00 00" # length
" 31 20" # value '1 '
" 0a 30 c2 00" # (300A, 00C2) Beam Name
" 06 00 00 00" # length
" 42 65 61 6d 20 31" # value 'Beam 1'
# -------------
" fe ff 00 e0" # (fffe, e000) Item Tag
" 18 00 00 00" # Item (dataset) Length
" 0a 30 c0 00" # (300A, 00C0) Beam Number
" 02 00 00 00" # length
" 32 20" # value '2 '
" 0a 30 c2 00" # (300A, 00C2) Beam Name
" 06 00 00 00" # length
" 42 65 61 6d 20 32" # value 'Beam 2'
)
infile = BytesIO(hex2bytes(hexstr))
de_gen = data_element_generator(infile,
is_implicit_VR=True,
is_little_endian=True)
raw_seq = next(de_gen)
seq = convert_value("SQ", raw_seq)
# The sequence is parsed, but only into raw data elements.
# They will be converted when asked for. Check some:
assert 1 == seq[0].BeamNumber
assert 'Beam 2' == seq[1].BeamName
def testEmptyItem(self):
"""Read sequence with a single empty item..."""
# This is fix for issue 27
hexstr = (
"08 00 32 10" # (0008, 1032) SQ "Procedure Code Sequence"
" 08 00 00 00" # length 8
" fe ff 00 e0" # (fffe, e000) Item Tag
" 00 00 00 00" # length = 0
) + ( # --------------- end of Sequence
" 08 00 3e 10" # (0008, 103e) LO "Series Description" nopep8
" 0c 00 00 00" # length nopep8
" 52 20 41 44 44 20 56 49 45 57 53 20" # value nopep8
)
# "\x08\x00\x32\x10\x08\x00\x00\x00\xfe\xff\x00\xe0\x00\x00\x00\x00"
# from issue 27, procedure code sequence (0008,1032)
# hexstr += "\x08\x00\x3e\x10\x0c\x00\x00\x00\x52\x20
# \x41\x44\x44\x20\x56\x49\x45\x57\x53\x20"
# data element following
fp = BytesIO(hex2bytes(hexstr))
gen = data_element_generator(fp,
is_implicit_VR=True,
is_little_endian=True)
raw_seq = next(gen)
seq = convert_value("SQ", raw_seq)
got_type = "got type {0}".format(str(type(seq)))
self.assertTrue(isinstance(seq, Sequence),
"Did not get Sequence, %s" % got_type)
expected = "Expected Sequence with single (empty) item"
got = "got {0:d} item(s)".format(len(seq))
self.assertTrue(len(seq) == 1, "%s, %s" % (expected, got))
msg = "Expected the sequence item (dataset) to be empty"
self.assertTrue(len(seq[0]) == 0, msg)
elem2 = next(gen)
self.assertEqual(elem2.tag, 0x0008103e,
"Expected a data element after empty sequence item")
def DataElement_from_raw(raw_data_element: RawDataElement,
encoding: Optional[List[str]] = None) -> DataElement:
"""Return a :class:`DataElement` created from `raw_data_element`.
Parameters
----------
raw_data_element : RawDataElement
The raw data to convert to a :class:`DataElement`.
encoding : list of str, optional
The character encoding of the raw data.
Returns
-------
DataElement
Raises
------
KeyError
If `raw_data_element` belongs to an unknown non-private tag and
`config.enforce_valid_values` is set.
"""
# XXX buried here to avoid circular import
# filereader->Dataset->convert_value->filereader
# (for SQ parsing)
from pydicom.values import convert_value
raw = raw_data_element
# If user has hooked into conversion of raw values, call his/her routine
if config.data_element_callback:
raw = config.data_element_callback(
raw_data_element,
encoding=encoding,
**config.data_element_callback_kwargs)
VR = raw.VR
if VR is None: # Can be if was implicit VR
try:
VR = dictionary_VR(raw.tag)
except KeyError:
# just read the bytes, no way to know what they mean
if raw.tag.is_private:
# for VR for private tags see PS3.5, 6.2.2
if raw.tag.is_private_creator:
VR = 'LO'
else:
VR = 'UN'
# group length tag implied in versions < 3.0
elif raw.tag.element == 0:
VR = 'UL'
else:
msg = "Unknown DICOM tag {0:s}".format(str(raw.tag))
if config.enforce_valid_values:
msg += " can't look up VR"
raise KeyError(msg)
else:
VR = 'UN'
msg += " - setting VR to 'UN'"
warnings.warn(msg)
elif (VR == 'UN' and not raw.tag.is_private
and config.replace_un_with_known_vr):
# handle rare case of incorrectly set 'UN' in explicit encoding
# see also DataElement.__init__()
if (raw.length == 0xffffffff or raw.value is None
or len(raw.value) < 0xffff):
try:
VR = dictionary_VR(raw.tag)
except KeyError:
pass
try:
value = convert_value(VR, raw, encoding)
except NotImplementedError as e:
raise NotImplementedError("{0:s} in tag {1!r}".format(str(e), raw.tag))
if raw.tag in _LUT_DESCRIPTOR_TAGS and value:
# We only fix the first value as the third value is 8 or 16
try:
if value[0] < 0:
value[0] += 65536
except TypeError:
pass
return DataElement(raw.tag,
VR,
value,
raw.value_tell,
raw.length == 0xFFFFFFFF,
already_converted=True)
def testReadBadValueInVREnforceValidValue(self):
pydicom.config.enforce_valid_values = True
# found a conversion
self.assertEqual('1A', convert_value('SH', self.tag))
# invalid literal for base 10
self.assertRaises(ValueError, convert_value, 'IS', self.tag)
def DataElement_from_raw(raw_data_element: RawDataElement,
encoding: Optional[Union[
str, MutableSequence[str]]] = None,
dataset: Optional["Dataset"] = None) -> DataElement:
"""Return a :class:`DataElement` created from `raw_data_element`.
Parameters
----------
raw_data_element : RawDataElement
The raw data to convert to a :class:`DataElement`.
encoding : str or list of str, optional
The character encoding of the raw data.
dataset : Dataset, optional
If given, used to resolve the VR for known private tags.
Returns
-------
DataElement
Raises
------
KeyError
If `raw_data_element` belongs to an unknown non-private tag and
:attr:`~pydicom.config.settings.reading_validation_mode` is set
to ``RAISE``.
"""
# XXX buried here to avoid circular import
# filereader->Dataset->convert_value->filereader
# (for SQ parsing)
from pydicom.values import convert_value
raw = raw_data_element
# If user has hooked into conversion of raw values, call his/her routine
if config.data_element_callback:
raw = config.data_element_callback(
raw_data_element,
encoding=encoding,
**config.data_element_callback_kwargs)
vr = raw.VR
if vr is None: # Can be if was implicit VR
try:
vr = dictionary_VR(raw.tag)
except KeyError:
# just read the bytes, no way to know what they mean
if raw.tag.is_private:
# for VR for private tags see PS3.5, 6.2.2
vr = _private_vr_for_tag(dataset, raw.tag)
# group length tag implied in versions < 3.0
elif raw.tag.element == 0:
vr = VR_.UL
else:
msg = f"Unknown DICOM tag {str(raw.tag)}"
if config.settings.reading_validation_mode == config.RAISE:
raise KeyError(msg + " can't look up VR")
vr = VR_.UN
warnings.warn(msg + " - setting VR to 'UN'")
elif vr == VR_.UN and config.replace_un_with_known_vr:
# handle rare case of incorrectly set 'UN' in explicit encoding
# see also DataElement.__init__()
if raw.tag.is_private:
vr = _private_vr_for_tag(dataset, raw.tag)
elif raw.value is None or len(raw.value) < 0xffff:
try:
vr = dictionary_VR(raw.tag)
except KeyError:
pass
try:
value = convert_value(vr, raw, encoding)
except NotImplementedError as e:
raise NotImplementedError(f"{str(e)} in tag {raw.tag!r}")
except BytesLengthException as e:
message = (
f"{e} This occurred while trying to parse {raw.tag} according "
f"to VR '{vr}'.")
if config.convert_wrong_length_to_UN:
warnings.warn(f"{message} Setting VR to 'UN'.")
vr = VR_.UN
value = raw.value
else:
raise BytesLengthException(
f"{message} To replace this error with a warning set "
"pydicom.config.convert_wrong_length_to_UN = True.")
if raw.tag in _LUT_DESCRIPTOR_TAGS and value:
# We only fix the first value as the third value is 8 or 16
try:
if value[0] < 0:
value[0] += 65536
except TypeError:
pass
return DataElement(
raw.tag,
vr,
value,
raw.value_tell,
raw.length == 0xFFFFFFFF,
already_converted=True,
)