def testImplVRLittleEndianUndefLength(self):
"""Raw read: Impl VR Little Endian with undefined length................"""
# (7fe0,0010), OB, 2-byte reserved, 4-byte-length (UNDEFINED)
hexstr1 = "e0 7f 10 00 ff ff ff ff"
hexstr2 = " 41 42 43 44 45 46 47 48 49 4a" # 'content'
hexstr3 = " fe ff dd e0 00 00 00 00" # Sequence Delimiter
hexstr = hexstr1 + hexstr2 + hexstr3
infile = BytesIO(hex2bytes(hexstr))
expected = ((0x7fe0, 0x10), 'OB or OW', 0xffffffff, b'ABCDEFGHIJ', 0x8, True, True)
de_gen = data_element_generator(infile, is_implicit_VR=True, is_little_endian=True)
got = next(de_gen)
msg_loc = "in read of undefined length Implicit VR ='OB' short value)"
self.assertEqual(got, expected, "Expected: %r, got %r in %s" % (expected, got, msg_loc))
# Test again such that delimiter crosses default 128-byte read "chunks", etc
for multiplier in (116, 117, 118, 120):
multiplier = 116
hexstr2b = hexstr2 + " 00" * multiplier
hexstr = hexstr1 + hexstr2b + hexstr3
infile = BytesIO(hex2bytes(hexstr))
expected = len('ABCDEFGHIJ' + '\0' * multiplier)
de_gen = data_element_generator(infile, is_implicit_VR=True, is_little_endian=True)
got = next(de_gen)
got_len = len(got.value)
msg_loc = "in read of undefined length Implicit VR with 'multiplier' %d" % multiplier
self.assertEqual(expected, got_len, "Expected value length %d, got %d in %s" % (expected, got_len, msg_loc))
msg = "Unexpected value start with multiplier %d on Implicit VR undefined length" % multiplier
self.assertTrue(got.value.startswith(b'ABCDEFGHIJ\0'), msg)
def testImplVRLittleEndianUndefLength(self):
"""Raw read: Impl VR Little Endian with undefined length..."""
# (7fe0,0010), OB, 2-byte reserved, 4-byte-length (UNDEFINED)
hexstr1 = "e0 7f 10 00 ff ff ff ff"
hexstr2 = " 41 42 43 44 45 46 47 48 49 4a" # 'content'
hexstr3 = " fe ff dd e0 00 00 00 00" # Sequence Delimiter
hexstr = hexstr1 + hexstr2 + hexstr3
infile = BytesIO(hex2bytes(hexstr))
expected = ((0x7fe0, 0x10), 'OB or OW', 0xffffffff, b'ABCDEFGHIJ', 0x8,
True, True)
de_gen = data_element_generator(infile,
is_implicit_VR=True,
is_little_endian=True)
assert expected == next(de_gen)
# Test again such that delimiter crosses default 128-byte "chunks"
for multiplier in (116, 117, 118, 120):
multiplier = 116
hexstr2b = hexstr2 + " 00" * multiplier
hexstr = hexstr1 + hexstr2b + hexstr3
infile = BytesIO(hex2bytes(hexstr))
expected = len('ABCDEFGHIJ' + '\0' * multiplier)
de_gen = data_element_generator(infile,
is_implicit_VR=True,
is_little_endian=True)
got = next(de_gen)
assert expected == len(got.value)
assert got.value.startswith(b'ABCDEFGHIJ\0')
def test_hex_to_bytes(self):
"""Test utils.hexutil.hex2bytes"""
hexstring = "00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
bytestring = (
b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09'
b'\x0A\x0B\x0C\x0D\x0E\x0F'
)
assert hex2bytes(hexstring) == bytestring
hexstring = "00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0"
bytestring = (
b'\x00\x10\x20\x30\x40\x50\x60\x70\x80\x90'
b'\xA0\xB0\xC0\xD0\xE0\xF0'
)
assert hex2bytes(hexstring) == bytestring
hexstring = b"00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
bytestring = (
b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09'
b'\x0A\x0B\x0C\x0D\x0E\x0F'
)
assert hex2bytes(hexstring) == bytestring
with pytest.raises(TypeError):
hex2bytes(0x1234)
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 testExplVRLittleEndianEncapsulatedUndefLengthBadDelimiterLength(self):
"""Raw read: Expl VR Little Endian encapsulated pixel data with
undefined length and a bad (non-zero) sequence delimiter length..."""
hexstr = (
"e0 7f 10 00" # (7fe0, 0010) Pixel Data
"4f 42 00 00" # VR OB, 2 bytes reserved
"ff ff ff ff" # -1 undefined length
"fe ff 00 e0" # (fffe, e000) Item Tag
"10 00 00 00" # Item (dataset) Length
"41 42 43 44"
"45 46 47 48"
"49 4a 4b 4c"
"4d 4e 4f 50"
"fe ff dd e0" # (fffe, edd) Sequence Delimiter
"12 13 14 15" # bad non-0 required Item Length Field
)
infile = BytesIO(hex2bytes(hexstr))
expected = (
(0x7fe0, 0x10),
'OB',
0xffffffff, # declared value length
b'\xfe\xff\x00\xe0\x10\x00\x00\x00ABCDEFGHIJKLMNOP',
12, # value starts 12 bytes after beginning of element
False, # is Implicit VR
True, # is Little Endian
True)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
assert expected == next(de_gen)
assert 44 == infile.tell()
def testExplVRLittleEndianEncapsulatedUndefLengthDeferred(self):
"""Raw read: Expl VR Little Endian encapsulated pixel data with
undefined length that's longer than defer_size..."""
hexstr = (
"e0 7f 10 00" # (7fe0, 0010) Pixel Data
"4f 42 00 00" # VR OB, 2 bytes reserved
"ff ff ff ff" # -1 undefined length
"fe ff 00 e0" # (fffe, e000) Item Tag
"14 00 00 00" # Item (dataset) Length
"41 42 43 44"
"45 46 47 48"
"49 4a 4b 4c"
"4d 4e 4f 50"
"51 52 53 54"
"fe ff dd e0" # (fffe, edd) Sequence Delimiter
"00 00 00 00" # required Item Length Field of value 0
)
infile = BytesIO(hex2bytes(hexstr))
expected = (
(0x7fe0, 0x10),
'OB',
0xffffffff, # declared value length
None, # extracted data
12, # value starts 12 bytes after beginning of element
False, # is Implicit VR
True, # is Little Endian
True)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True,
defer_size=16)
assert expected == next(de_gen)
assert 48 == infile.tell()
def test_hex_to_bytes(self):
"""Test utils.hexutil.hex2bytes"""
hexstring = "00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
bytestring = b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09' \
b'\x0A\x0B\x0C\x0D\x0E\x0F'
assert bytestring == hex2bytes(hexstring)
hexstring = b"00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
bytestring = b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09' \
b'\x0A\x0B\x0C\x0D\x0E\x0F'
assert bytestring == hex2bytes(hexstring)
hexstring = "00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0"
bytestring = b'\x00\x10\x20\x30\x40\x50\x60\x70\x80\x90' \
b'\xA0\xB0\xC0\xD0\xE0\xF0'
assert bytestring == hex2bytes(hexstring)
def testExplVRLittleEndianLongLength(self):
"""Raw read: Explicit VR Little Endian long length......................"""
# (0002,0001) OB 2-byte-reserved 4-byte-length, value 0x00 0x01
infile = BytesIO(hex2bytes("02 00 01 00 4f 42 00 00 02 00 00 00 00 01"))
expected = ((2, 1), 'OB', 2, b'\00\01', 0xc, False, True)
de_gen = data_element_generator(infile, is_implicit_VR=False, is_little_endian=True)
got = next(de_gen)
msg_loc = "in read of Explicit VR='OB' data element (long length format)"
self.assertEqual(got, expected, "Expected: %r, got %r in %s" % (expected, got, msg_loc))
def testImplVRLittleEndian(self):
"""Raw read: Implicit VR Little Endian.................................."""
# (0008,212a) {IS} 4-byte-length, value '1 '
infile = BytesIO(hex2bytes("08 00 2a 21 02 00 00 00 31 20"))
expected = ((8, 0x212a), None, 2, b'1 ', 0x8, True, True)
de_gen = data_element_generator(infile, is_implicit_VR=True, is_little_endian=True)
got = next(de_gen)
msg_loc = "in read of Implicit VR='IS' data element (short length format)"
self.assertEqual(got, expected, "Expected: %r, got %r in %s" % (expected, got, msg_loc))
def setup(self):
# Set up a dataset with commas in one item instead of backslash
namespace = {}
exec(raw_hex_code, {}, namespace)
ds_bytes = hexutil.hex2bytes(namespace['impl_LE_deflen_std_hex'])
# Change "2\4\8\16" to "2,4,8,16"
ds_bytes = ds_bytes.replace(b"\x32\x5c\x34\x5c\x38\x5c\x31\x36",
b"\x32\x2c\x34\x2c\x38\x2c\x31\x36")
self.bytesio = BytesIO(ds_bytes)
def test_hex_to_bytes(self):
"""Test utils.hexutil.hex2bytes"""
hexstring = "00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
bytestring = b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09' \
b'\x0A\x0B\x0C\x0D\x0E\x0F'
assert bytestring == hex2bytes(hexstring)
hexstring = b"00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F"
bytestring = b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09' \
b'\x0A\x0B\x0C\x0D\x0E\x0F'
assert bytestring == hex2bytes(hexstring)
hexstring = "00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0"
bytestring = b'\x00\x10\x20\x30\x40\x50\x60\x70\x80\x90' \
b'\xA0\xB0\xC0\xD0\xE0\xF0'
assert bytestring == hex2bytes(hexstring)
with pytest.raises(TypeError):
hex2bytes(0x1234)
def setUp(self):
# Set up a dataset with commas in one item instead of backslash
namespace = {}
exec(raw_hex_code, {}, namespace)
ds_bytes = hexutil.hex2bytes(namespace['impl_LE_deflen_std_hex'])
# Change "2\4\8\16" to "2,4,8,16"
ds_bytes = ds_bytes.replace(b"\x32\x5c\x34\x5c\x38\x5c\x31\x36",
b"\x32\x2c\x34\x2c\x38\x2c\x31\x36")
self.bytesio = BytesIO(ds_bytes)
def testExplVRLittleEndianLongLength(self):
"""Raw read: Explicit VR Little Endian long length..."""
# (0002,0001) OB 2-byte-reserved 4-byte-length, value 0x00 0x01
bytes_input = "02 00 01 00 4f 42 00 00 02 00 00 00 00 01"
infile = BytesIO(hex2bytes(bytes_input))
expected = ((2, 1), 'OB', 2, b'\00\01', 0xc, False, True)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
assert expected == next(de_gen)
def testImplVRLittleEndian(self):
"""Raw read: Implicit VR Little Endian..."""
# (0008,212a) {IS} 4-byte-length, value '1 '
infile = BytesIO(hex2bytes("08 00 2a 21 02 00 00 00 31 20"))
expected = ((8, 0x212a), None, 2, b'1 ', 0x8, True, True)
de_gen = data_element_generator(infile,
is_implicit_VR=True,
is_little_endian=True)
assert expected == next(de_gen)
def testExplVRLittleEndianShortLength(self):
"""Raw read: Explicit VR Little Endian short length..."""
# (0008,212a) IS 2-byte-length, value '1 '
infile = BytesIO(hex2bytes("08 00 2a 21 49 53 02 00 31 20"))
# XXX Assumes that a RawDataElement doesn't convert the value based
# upon the VR value, thus it will remain a byte string since that is
# the input
expected = ((8, 0x212a), 'IS', 2, b'1 ', 0x8, False, True)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
assert expected == next(de_gen)
def testExplVRLittleEndianShortLength(self):
"""Raw read: Explicit VR Little Endian short length....................."""
# (0008,212a) IS 2-byte-length, value '1 '
infile = BytesIO(hex2bytes("08 00 2a 21 49 53 02 00 31 20"))
# XXX Assumes that a RawDataElement doesn't convert the value based
# upon the VR value, thus it will remain a byte string since that is
# the input
expected = ((8, 0x212a), 'IS', 2, b'1 ', 0x8, False, True)
de_gen = data_element_generator(infile, is_implicit_VR=False, is_little_endian=True)
got = next(de_gen)
msg_loc = "in read of Explicit VR='IS' data element (short length format)"
self.assertEqual(got, expected, "Expected: %r, got %r in %s" % (expected, got, msg_loc))
def testExplVRLittleEndianUndefLength(self):
"""Raw read: Expl VR Little Endian with undefined length..."""
# (7fe0,0010), OB, 2-byte reserved, 4-byte-length (UNDEFINED)
hexstr1 = "e0 7f 10 00 4f 42 00 00 ff ff ff ff"
hexstr2 = " 41 42 43 44 45 46 47 48 49 4a" # 'content'
hexstr3 = " fe ff dd e0 00 00 00 00" # Sequence Delimiter
hexstr = hexstr1 + hexstr2 + hexstr3
infile = BytesIO(hex2bytes(hexstr))
expected = ((0x7fe0, 0x10), 'OB', 0xffffffff, b'ABCDEFGHIJ', 0xc,
False, True)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
got = next(de_gen)
msg_loc = "in read of undefined length Explicit VR ='OB' short value)"
self.assertEqual(
got, expected,
"Expected: %r, got %r in %s" % (expected, got, msg_loc))
# Test again such that delimiter crosses default 128-byte "chunks"
for multiplier in (116, 117, 118, 120):
multiplier = 116
hexstr2b = hexstr2 + " 00" * multiplier
hexstr = hexstr1 + hexstr2b + hexstr3
infile = BytesIO(hex2bytes(hexstr))
expected = len('ABCDEFGHIJ' + '\0' * multiplier)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
got = next(de_gen)
got_len = len(got.value)
msg_loc = "in read of undefined length Explicit VR ='OB'"
msg_loc = "%s with 'multiplier' %d" % (msg_loc, multiplier)
self.assertEqual(
expected, got_len, "Expected value length %d, got %d in %s" %
(expected, got_len, msg_loc))
msg = "Unexpected value start with multiplier %d" % (multiplier)
msg = "%s on Expl VR undefined length" % (msg)
self.assertTrue(got.value.startswith(b'ABCDEFGHIJ\0'), msg)
def testImplVRLittleEndian(self):
"""Raw read: Implicit VR Little Endian.................................."""
# (0008,212a) {IS} 4-byte-length, value '1 '
infile = BytesIO(hex2bytes("08 00 2a 21 02 00 00 00 31 20"))
expected = ((8, 0x212a), None, 2, b'1 ', 0x8, True, True)
de_gen = data_element_generator(infile,
is_implicit_VR=True,
is_little_endian=True)
got = next(de_gen)
msg_loc = "in read of Implicit VR='IS' data element (short length format)"
self.assertEqual(
got, expected,
"Expected: %r, got %r in %s" % (expected, got, msg_loc))
def testExplVRBigEndian_UndefinedLengthSeq(self):
"""Raw read: ExplVR BigEndian Undefined Length SQ..."""
# Create a fictional sequence with bytes directly,
# similar to PS 3.5-2008 Table 7.5-2 p42
hexstr = (
"30 0a 00 B0" # (300a, 00b0) Beam Sequence
" 53 51" # SQ
" 00 00" # reserved
" ff ff ff ff" # undefined length
" ff fe e0 00" # (fffe, e000) Item Tag
" 00 00 00 18" # Item (dataset) Length
" 30 0a 00 c0" # (300A, 00C0) Beam Number
" 49 53" # IS
" 00 02" # length
" 31 20" # value '1 '
" 30 0a 00 c2" # (300A, 00C2) Beam Name
" 4c 4F" # LO
" 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
" 49 53" # IS
" 00 02" # length
" 32 20" # value '2 '
" 30 0a 00 c2" # (300A, 00C2) Beam Name
" 4C 4F" # LO
" 00 06" # length
" 42 65 61 6d 20 32" # value 'Beam 2'
" ff fe E0 dd" # SQ delimiter
" 00 00 00 00" # zero length
)
infile = BytesIO(hex2bytes(hexstr))
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=False)
seq = next(de_gen)
# Note seq itself is not a raw data element.
# The parser does parse undefined length SQ
# 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 testExplVRBigEndian_UndefinedLengthSeq(self):
"""Raw read: ExplVR BigEndian Undefined Length SQ..."""
# Create a fictional sequence with bytes directly,
# similar to PS 3.5-2008 Table 7.5-2 p42
hexstr = (
"30 0a 00 B0" # (300a, 00b0) Beam Sequence
" 53 51" # SQ
" 00 00" # reserved
" ff ff ff ff" # undefined length
" ff fe e0 00" # (fffe, e000) Item Tag
" 00 00 00 18" # Item (dataset) Length
" 30 0a 00 c0" # (300A, 00C0) Beam Number
" 49 53" # IS
" 00 02" # length
" 31 20" # value '1 '
" 30 0a 00 c2" # (300A, 00C2) Beam Name
" 4c 4F" # LO
" 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
" 49 53" # IS
" 00 02" # length
" 32 20" # value '2 '
" 30 0a 00 c2" # (300A, 00C2) Beam Name
" 4C 4F" # LO
" 00 06" # length
" 42 65 61 6d 20 32" # value 'Beam 2'
" ff fe E0 dd" # SQ delimiter
" 00 00 00 00" # zero length
)
infile = BytesIO(hex2bytes(hexstr))
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=False)
seq = next(de_gen)
# Note seq itself is not a raw data element.
# The parser does parse undefined length SQ
# 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 testExplVRLittleEndianLongLength(self):
"""Raw read: Explicit VR Little Endian long length......................"""
# (0002,0001) OB 2-byte-reserved 4-byte-length, value 0x00 0x01
infile = BytesIO(
hex2bytes("02 00 01 00 4f 42 00 00 02 00 00 00 00 01"))
expected = ((2, 1), 'OB', 2, b'\00\01', 0xc, False, True)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
got = next(de_gen)
msg_loc = "in read of Explicit VR='OB' data element (long length format)"
self.assertEqual(
got, expected,
"Expected: %r, got %r in %s" % (expected, got, msg_loc))
def test_empty_AT(self):
"""Write empty AT correctly.........."""
# Was issue 74
data_elem = DataElement(0x00280009, "AT", [])
expected = hex2bytes((
" 28 00 09 00" # (0028,0009) Frame Increment Pointer
" 00 00 00 00" # length 0
))
write_data_element(self.f1, data_elem)
got = self.f1.parent.getvalue()
msg = ("Did not write zero-length AT value correctly. "
"Expected %r, got %r") % (bytes2hex(expected), bytes2hex(got))
msg = "%r %r" % (type(expected), type(got))
msg = "'%r' '%r'" % (expected, got)
self.assertEqual(expected, got, msg)
def test_empty_AT(self):
"""Write empty AT correctly.........."""
# Was issue 74
data_elem = DataElement(0x00280009, "AT", [])
expected = hex2bytes((
" 28 00 09 00" # (0028,0009) Frame Increment Pointer
" 00 00 00 00" # length 0
))
write_data_element(self.f1, data_elem)
got = self.f1.parent.getvalue()
msg = ("Did not write zero-length AT value correctly. "
"Expected %r, got %r") % (bytes2hex(expected), bytes2hex(got))
msg = "%r %r" % (type(expected), type(got))
msg = "'%r' '%r'" % (expected, got)
self.assertEqual(expected, got, msg)
def testExplVRLittleEndianShortLength(self):
"""Raw read: Explicit VR Little Endian short length..."""
# (0008,212a) IS 2-byte-length, value '1 '
infile = BytesIO(hex2bytes("08 00 2a 21 49 53 02 00 31 20"))
# XXX Assumes that a RawDataElement doesn't convert the value based
# upon the VR value, thus it will remain a byte string since that is
# the input
expected = ((8, 0x212a), 'IS', 2, b'1 ', 0x8, False, True)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
got = next(de_gen)
msg_loc = "in read of Explicit VR='IS'"
msg_loc = "%s data element (short length format)" % (msg_loc)
self.assertEqual(
got, expected,
"Expected: %r, got %r in %s" % (expected, got, msg_loc))
def compare_write(self, hex_std, file_ds):
"""Write file and compare with expected byte string
:arg hex_std: the bytes which should be written, as space separated hex
:arg file_ds: a FileDataset instance containing the dataset to write
"""
out_filename = "scratch.dcm"
file_ds.save_as(out_filename)
std = hex2bytes(hex_std)
with open(out_filename, 'rb') as f:
bytes_written = f.read()
# print "std :", bytes2hex(std)
# print "written:", bytes2hex(bytes_written)
same, pos = bytes_identical(std, bytes_written)
self.assertTrue(same,
"Writing from scratch unexpected result - 1st diff at 0x%x" % pos)
if os.path.exists(out_filename):
os.remove(out_filename) # get rid of the file
def compare_write(self, hex_std, file_ds):
"""Write file and compare with expected byte string
:arg hex_std: the bytes which should be written, as space separated hex
:arg file_ds: a FileDataset instance containing the dataset to write
"""
out_filename = "scratch.dcm"
file_ds.save_as(out_filename)
std = hex2bytes(hex_std)
with open(out_filename, 'rb') as f:
bytes_written = f.read()
# print "std :", bytes2hex(std)
# print "written:", bytes2hex(bytes_written)
same, pos = bytes_identical(std, bytes_written)
self.assertTrue(same,
"Writing from scratch unexpected result - 1st diff at 0x%x" % pos)
if os.path.exists(out_filename):
os.remove(out_filename) # get rid of the file
def testExplVRLittleEndianEncapsulatedUndefLengthAndItemLengthMIssing(
self):
"""Raw read: Expl VR Little Endian encapsulated pixel data with
undefined length and whose fragment (Item) ends before its length
is specified..."""
hexstr = (
"e0 7f 10 00" # (7fe0, 0010) Pixel Data
"4f 42 00 00" # VR OB, 2 bytes reserved
"ff ff ff ff" # -1 undefined length
"fe ff 00 e0" # (fffe, e000) Item Tag
)
infile = BytesIO(hex2bytes(hexstr))
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
with pytest.raises(EOFError):
next(de_gen)
def testExplVRLittleEndianEncapsulatedUndefLengthTwoFragments(self):
"""Raw read: Expl VR Little Endian encapsulated pixel data with
undefined length broken into two defined-length fragments..."""
hexstr = (
"e0 7f 10 00" # (7fe0, 0010) Pixel Data
"4f 42 00 00" # VR OB, 2 bytes reserved
"ff ff ff ff" # -1 undefined length
"fe ff 00 e0" # (fffe, e000) Item Tag
"18 00 00 00" # Item (dataset) Length
"41 42 43 44"
"45 46 47 48"
"49 4a 4b 4c"
"4d 4e 4f 50"
"51 52 53 54"
"55 56 57 58"
"fe ff 00 e0" # (fffe, e000) Item Tag
"14 00 00 00" # Item (dataset) Length
"41 42 43 44"
"45 46 47 48"
"49 4a 4b 4c"
"4d 4e 4f 50"
"51 52 53 54"
"fe ff dd e0" # (fffe, edd) Sequence Delimiter
"00 00 00 00" # required Item Length Field of value 0
)
infile = BytesIO(hex2bytes(hexstr))
expected = (
(0x7fe0, 0x10),
'OB',
0xffffffff, # declared value length
(b'\xfe\xff\x00\xe0\x18\x00\x00\x00ABCDEFGHIJKLMNOPQRSTUVWX'
b'\xfe\xff\x00\xe0\x14\x00\x00\x00ABCDEFGHIJKLMNOPQRST'),
12, # value starts 12 bytes after beginning of element
False, # is Implicit VR
True, # is Little Endian
True)
de_gen = data_element_generator(infile,
is_implicit_VR=False,
is_little_endian=True)
assert expected == next(de_gen)
assert 80 == infile.tell()
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")
