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
fragments = generate_pixel_data_fragment(fp)
assert next(fragments) == b'\x01\x00\x00\x00'
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert next(fragments) == b'\x01\x00\x00\x00'
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert_raises_regex(ValueError, "'fp.is_little_endian' must be True",
next, fragments)
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
with pytest.raises(ValueError,
match="'fp.is_little_endian' must be True"):
next(fragments)
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert_raises_regex(
ValueError, "Undefined item length at offset 4 when "
"parsing the encapsulated pixel data "
"fragments.", next, fragments)
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert next(fragments) == b'\x01\x00\x00\x00'
assert next(fragments) == b'\x01\x02\x03\x04\x05\x06'
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
with pytest.raises(ValueError,
match="Undefined item length at offset 4 when "
"parsing the encapsulated pixel data "
"fragments."):
next(fragments)
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert next(fragments) == b'\x01\x00\x00\x00'
assert next(fragments) == b'\x01\x02\x03\x04\x05\x06'
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert next(fragments) == b'\x01\x00\x00\x00'
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert next(fragments) == b'\x01\x00\x00\x00'
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert next(fragments) == b'\x01\x00\x00\x00'
assert_raises_regex(
ValueError, "Unexpected tag '\(0010, 0010\)' at offset 12 "
"when parsing the encapsulated pixel data "
"fragment items.", next, fragments)
pytest.raises(StopIteration, next, fragments)
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
fragments = generate_pixel_data_fragment(fp)
assert next(fragments) == b'\x01\x00\x00\x00'
with pytest.raises(ValueError,
match="Unexpected tag '\(0010, 0010\)' at offset "
"12 when parsing the encapsulated pixel data "
"fragment items."):
next(fragments)
pytest.raises(StopIteration, next, fragments)
