def test_item_undefined_length(self):
"""Test exception raised if item length undefined."""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\xFF\xFF\xFF\xFF' \
b'\x00\x00\x00\x01'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
with pytest.raises(ValueError,
match="Encapsulated data fragment had Undefined "
"Length at data position 0x4"):
read_item(fp)
def test_item_undefined_length(self):
"""Test exception raised if item length undefined."""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\xFF\xFF\xFF\xFF' \
b'\x00\x00\x00\x01'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
with pytest.raises(ValueError,
match="Encapsulated data fragment had Undefined "
"Length at data position 0x4"):
read_item(fp)
def test_multi_fragments_no_delimiter(self):
"""Test multi fragments are returned OK"""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00' \
b'\xFE\xFF\x00\xE0' \
b'\x06\x00\x00\x00' \
b'\x01\x02\x03\x04\x05\x06'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
assert read_item(fp) == b'\x01\x02\x03\x04\x05\x06'
def test_multi_fragments_no_delimiter(self):
"""Test multi fragments are returned OK"""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00' \
b'\xFE\xFF\x00\xE0' \
b'\x06\x00\x00\x00' \
b'\x01\x02\x03\x04\x05\x06'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
assert read_item(fp) == b'\x01\x02\x03\x04\x05\x06'
def test_item_sequence_delimiter_zero_length(self):
"""Test that the fragments are returned if seq delimiter hit."""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00' \
b'\xFE\xFF\xDD\xE0' \
b'\x00\x00\x00\x00' \
b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x02\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
assert read_item(fp) is None
assert read_item(fp) == b'\x02\x00\x00\x00'
def test_item_sequence_delimiter(self):
"""Test non-zero length seq delimiter reads correctly."""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00' \
b'\xFE\xFF\xDD\xE0' \
b'\x04\x00\x00\x00' \
b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x02\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
assert read_item(fp) is None
assert read_item(fp) == b'\x02\x00\x00\x00'
def test_item_sequence_delimiter_zero_length(self):
"""Test that the fragments are returned if seq delimiter hit."""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00' \
b'\xFE\xFF\xDD\xE0' \
b'\x00\x00\x00\x00' \
b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x02\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
assert read_item(fp) is None
assert read_item(fp) == b'\x02\x00\x00\x00'
def test_item_sequence_delimiter(self):
"""Test non-zero length seq delimiter reads correctly."""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00' \
b'\xFE\xFF\xDD\xE0' \
b'\x04\x00\x00\x00' \
b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x02\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
assert read_item(fp) is None
assert read_item(fp) == b'\x02\x00\x00\x00'
def test_single_fragment_no_delimiter(self):
"""Test single fragment is returned OK"""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
def test_item_bad_tag(self):
"""Test item is read if it has an unexpected tag"""
# This should raise an exception instead
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00' \
b'\x10\x00\x10\x00' \
b'\x04\x00\x00\x00' \
b'\xFF\x00\xFF\x00' \
b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x02\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
assert read_item(fp) == b'\xFF\x00\xFF\x00'
assert read_item(fp) == b'\x02\x00\x00\x00'
def test_single_fragment_no_delimiter(self):
"""Test single fragment is returned OK"""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
def test_item_bad_tag(self):
"""Test item is read if it has an unexpected tag"""
# This should raise an exception instead
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00' \
b'\x10\x00\x10\x00' \
b'\x04\x00\x00\x00' \
b'\xFF\x00\xFF\x00' \
b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x02\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = True
assert read_item(fp) == b'\x01\x00\x00\x00'
assert read_item(fp) == b'\xFF\x00\xFF\x00'
assert read_item(fp) == b'\x02\x00\x00\x00'