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):
get_nr_fragments(fp)
def test_not_little_endian(self):
"""Test reading big endian raises exception"""
bytestream = b'\xFE\xFF\x00\xE0' \
b'\x04\x00\x00\x00' \
b'\x01\x00\x00\x00'
fp = DicomBytesIO(bytestream)
fp.is_little_endian = False
with pytest.raises(ValueError,
match="'fp.is_little_endian' must be True"):
get_nr_fragments(fp)
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 1 == get_nr_fragments(fp)
def test_item_bad_tag(self):
"""Test exception raised if item has unexpected tag"""
bytestream = (b'\xFE\xFF\x00\xE0'
b'\x04\x00\x00\x00'
b'\x01\x00\x00\x00'
b'\x10\x00\x10\x00'
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
msg = (
r"Unexpected tag '\(0010, 0010\)' at offset 12 when parsing the "
r"encapsulated pixel data fragment items.")
with pytest.raises(ValueError, match=msg):
get_nr_fragments(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 2 == get_nr_fragments(fp)
def test_item_sequence_delimiter(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 1 == get_nr_fragments(fp)
