def context_encode(tag):
"""Encode the object into a tag, encode it in a PDU, return the data."""
if _debug: context_encode._debug("context_encode %r", tag)
data = PDUData()
tag.encode(data)
return data.pduData
def test_tag(self):
if _debug: TestTag._debug("test_tag")
# test tag construction
tag = Tag()
assert (tag.tagClass, tag.tagNumber) == (None, None)
# must have a valid encoded tag to extract from the data
data = PDUData(xtob(''))
with self.assertRaises(DecodingError):
tag = Tag(data)
# must have two values, class and number
with self.assertRaises(ValueError):
tag = Tag(0)
tag = Tag(0, 1)
assert (tag.tagClass, tag.tagNumber) == (0, 1)
tag = Tag(0, 1, 2)
assert (tag.tagClass, tag.tagNumber, tag.tagLVT) == (0, 1, 2)
# tag data must be bytes or bytearray
with self.assertRaises(TypeError):
tag = Tag(0, 1, 2, 3)
def context_decode(blob):
"""Build PDU from the string, decode the tag, convert to an object."""
if _debug: context_decode._debug("context_decode %r", blob)
data = PDUData(blob)
tag = ContextTag(data)
return tag
def opening_decode(blob):
"""Build PDU from the string, decode the tag, convert to an object."""
if _debug: opening_decode._debug("opening_decode %r", blob)
data = PDUData(blob)
tag = OpeningTag(data)
return tag
def obj_decode(blob):
"""Build PDU from the string, decode the tag, convert to an object."""
if _debug: obj_decode._debug("obj_decode %r", blob)
data = PDUData(blob)
tag = Tag(data)
obj = tag.app_to_object()
return obj
def obj_encode(obj):
"""Encode the object into a tag, encode it in a PDU, return the data."""
if _debug: obj_encode._debug("obj_encode %r", obj)
tag = Tag()
obj.encode(tag)
data = PDUData()
tag.encode(data)
return data.pduData
def test_endec_0(self):
"""Test empty tag list encoding and decoding.
"""
if _debug: TestTagList._debug("test_endec_0")
taglist = TagList([])
data = PDUData()
taglist.encode(data)
assert data.pduData == xtob('')
taglist = TagList()
taglist.decode(data)
assert taglist.tagList == []
def test_endec_3(self):
"""Test bracketed application tagged integer encoding and decoding."""
if _debug: TestTagList._debug("test_endec_2")
tag0 = OpeningTag(0)
tag1 = IntegerTag(0x0102)
tag2 = ClosingTag(0)
taglist = TagList([tag0, tag1, tag2])
data = PDUData()
taglist.encode(data)
assert data.pduData == xtob('0E3201020F')
taglist = TagList()
taglist.decode(data)
assert taglist.tagList == [tag0, tag1, tag2]
def test_endec_2(self):
"""Test short tag list encoding and decoding, context tags.
"""
if _debug: TestTagList._debug("test_endec_2")
tag0 = ContextTag(0, xtob('00'))
tag1 = ContextTag(1, xtob('01'))
taglist = TagList([tag0, tag1])
data = PDUData()
taglist.encode(data)
assert data.pduData == xtob('09001901')
taglist = TagList()
taglist.decode(data)
assert taglist.tagList == [tag0, tag1]
def test_endec_1(self):
"""Test short tag list encoding and decoding, application tags.
"""
if _debug: TestTagList._debug("test_endec_1")
tag0 = IntegerTag(0x00)
tag1 = IntegerTag(0x01)
taglist = TagList([tag0, tag1])
data = PDUData()
taglist.encode(data)
assert data.pduData == xtob('31003101')
taglist = TagList()
taglist.decode(data)
assert taglist.tagList == [tag0, tag1]