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table.py
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# -*- coding: iso-8859-1 -*- #
# ======================================================================
#
# Copyright (C) 2013 Kay Schluehr (kay@fiber-space.de)
#
# t3.table.py, v B.0 2013/09/03
#
# ======================================================================
__all__ = [
"T3Binding",
"T3Field",
"T3Table",
"T3TableContext",
"T3List",
"T3Set",
"T3Bitset",
"T3Repeater",
"T3Bitmap"]
import sys
import abc
import functools
import pprint
from collections import Iterable, defaultdict
from copy import copy
import t3
import t3.pattern
from t3.pattern import T3Pattern, T3Match, MatchingFailure
from t3.number import T3Number, Hex, Bin, T3Value
MAXSIZE = 2**64
###################################### T3Binding #################################
class T3Binding(object):
def __init__(self, callback, name = None):
self.obj = None
self.name = name
self.callback = callback
def get_value(self):
return self.callback(self._bound_value())
def _compute_rest(self):
"Function used to handle the '*' binding pattern"
if not isinstance(self.obj, Iterable):
raise TypeError("binding object '%s'is not iterable"%self.obj)
if isinstance(self.obj, T3Table):
value = []
for i, field in enumerate(self.obj):
if field.value_binding == self:
value = [field.get_value() for field in self.obj._fields[i+1:]]
break
if value:
return functools.reduce(lambda x,y: x // y, value)
else:
return T3Number.NULL
else:
raise TypeError("unable to compute rest of the object")
def _bound_value(self):
if self.name == "*":
return self._compute_rest()
elif self.name:
return getattr(self.obj, self.name)
else:
return self.obj
################################# _T3DocObject ###################################
class _T3DocObject:
def __init__(self, t3table, callback):
self.table = t3table
self.callback = callback
def __repr__(self):
return self.callback(self.table)
###################################### T3Field ###################################
_binding_stack = []
class T3Field(object):
'''
O M O O O
.--------------------------------------------------------.
| Pattern | Name | ValueBinding | Value | ValueFormatter |
'--------------------------------------------------------'
'''
def __init__(self, pattern = None,
name = None,
value = T3Number.NULL,
value_binding = None,
value_formatter = None,
table = None):
self.table = table
self.name = name
self.value = value
self.pattern = self.make_pattern(pattern)
self.value_binding = value_binding
self.value_formatter = value_formatter
def make_pattern(self, P):
if P is not None:
return t3.pattern.pattern_factory(P)
def __copy__(self):
# TODO: what about T3Lists?
if isinstance(self.pattern, (T3Table, t3.pattern.T3PatternPrefixed)):
pattern = copy(self.pattern)
else:
pattern = self.pattern
field = T3Field(pattern, self.name, self.value, self.value_binding, self.value_formatter)
return field
def __bool__(self):
return self.value is not None
def __nonzero__(self):
return self.value is not None
def reset_if_bound(self):
if self.value_binding:
self.value = T3Number.NULL
def get_value(self):
global _binding_stack
if self.value is not None and self.value is not T3Number.NULL:
return self.value
if self.value_binding:
self.value_binding.obj = self.table
if len(_binding_stack)>10 and self.value_binding in _binding_stack:
_binding_stack = []
raise RuntimeError("Circular binding can't be resolved")
_binding_stack.append(self.value_binding)
value = self.value_binding.get_value()
_binding_stack.pop()
if isinstance(value, T3Table):
return value
if self.table:
return self.table._coerce(value)
else:
return value
return self.value
# The following three methods are defined for convenience. They are used when either a T3Field or a list [T3Field] of
# T3Field objects is returned. So a T3Field object is equipped with a simple list-like interface.
def __getitem__(self, i):
'''
This method is defined for convenience. It is used when either a T3Field or a list [T3Field] of T3Field objects
is returned.
'''
if i!=0:
raise IndexError("field index out of range")
return self
def __len__(self):
return 1
def __iter__(self):
return (self,)
def __repr__(self):
return "<t3table.T3Field '%s = %s'>"%(self.name, self.get_value())
###################################### T3Table ###################################
class T3Table(object):
def __init__(self):
self._fields = []
self._fieldnames = defaultdict(int)
self._parent = None
@classmethod
def join(cls, args):
for arg in args:
if not isinstance(arg, T3Table):
inst = cls()
cls2 = inst._coerce(arg).__class__
return cls2.join(inst._coerce(arg) for arg in args)
return T3List(copy(arg) for arg in args)
def find(self, name):
'''
Breadth first search for a T3Field with a given ``name``.
:param name: the name to search for
:returns: the value of the T3Field that was searched for, None if
nothing was found.
'''
for field in self._fields:
if field.name == name:
return field.get_value()
for field in self._fields:
if isinstance(field.value, T3Table):
res = field.value.find(name)
if res:
return res
def get_value(self):
value = []
for field in self._fields:
if field:
v = field.get_value()
if v is not None:
if isinstance(v, T3Bitmap):
value.append(Hex(v))
elif isinstance(v, T3Value):
value.append(v.get_value())
else:
value.append(v)
n = len(value)
if n == 0:
return self._get_null_value()
elif n == 1:
return value[0]
else:
return functools.reduce(lambda x,y: x // y, value)
def add(self, pattern = 0, **kwds):
field = self._new_field(pattern, kwds)
self._fields.append(field)
self._fieldnames[field.name]+=1
if isinstance(field.value, T3Table):
field.value._parent = self
field.table = self
return self
def match(self, data):
data = self._coerce(data)
table = copy(self)
fields = [field for field in table._fields if field]
P = t3.pattern.T3PatternTable(fields)
m = P.match(data)
if not m.fail:
if m.rest == data:
m.fail = True
return m
else:
m.value = table
table._auto_parent()
return m
def __iter__(self):
return self._fields.__iter__()
def __floordiv__(self, other):
return self.__class__.join([self, other])
def __lshift__(self, data):
m = self.match(data)
if m.fail:
raise t3.pattern.MatchingFailure(m)
else:
return m.value
def __getitem__(self, name):
k = self._fieldnames.get(name, 0)
if k == 0:
raise AttributeError("Field with name '%s' not found"%name)
elif k == 1:
for field in self._fields:
if field.name == name:
return field
else:
return list(field for field in self._fields if field.name == name)
def __len__(self):
return len(self._fields)
def __nonzero__(self):
return bool(len(self._fields))
def __contains__(self, name):
return name in self._fieldnames
def __copy__(self):
table = self.__class__()
for field in self._fields:
R = copy(field)
R.table = table
table._fields.append(R)
table._fieldnames = self._fieldnames.copy()
return table
def __call__(self, __doc__ = "", **fields):
R = self._get_root()
memo = {}
root = R._treecopy(memo)
table = memo[id(self)]
if __doc__:
if hasattr(__doc__, "__call__"):
table.__doc__ = _T3DocObject(table, __doc__)
else:
table.__doc__ = __doc__
else:
try:
if isinstance(self.__doc__, _T3DocObject):
table.__doc__ = _T3DocObject(table, self.__doc__.callback)
except AttributeError:
pass
for name, value in fields.items():
if name in table._fieldnames:
table.__setattr__(name, value)
else:
raise ValueError("cannot create copy of T3Table with new field '%s'"%name)
return root
def __getattr__(self, name):
field = self.__getitem__(name)
if len(field) == 1:
return field.get_value()
else:
return [r.get_value() for r in field]
def __setattr__(self, name, value):
if name.startswith("_"):
object.__setattr__(self, name, value)
else:
self._update(name, value)
def _get_root(self):
if self._parent is not None:
return self._parent._get_root()
return self
def _coerce(self, v):
if isinstance(v, T3Number):
return v
else:
return Hex(v)
def _get_null_value(self):
return T3Number.NULL
def _set_value_and_binding(self, field, v):
if isinstance(v, T3Binding):
field.value_binding = v
elif v is None or isinstance(v, (T3List, T3Table)):
field.value = v
elif isinstance(v, T3Field):
if field.name != v.name:
raise ValueError("Cannot update field '%s' with field '%s'. Fields must have equal names"%(field.name, v.name))
self._set_pattern(field, v.pattern)
if v.value_binding:
field.value = self._get_null_value()
field.value_binding = v.value_binding
else:
field.value_binding = None
self._set_value_and_binding(field, v.value)
else:
field.value = self._coerce(v)
return field
def _set_pattern(self, field, P):
field.pattern = field.make_pattern(P)
def _new_field(self, pattern, dct):
if isinstance(pattern, T3Field):
return pattern[0]
else:
if not dct:
raise TypeError("T3Field:name is mandatory attribute. Cannot construct T3Field")
ValueFormatter = None
if len(dct)>1:
if "__repr__" in dct:
ValueFormatter = dct["__repr__"]
del dct["__repr__"]
if len(dct)>1:
raise TypeError("cannot construct T3Field from dictionary %s."%dct)
name, v = dct.items()[0]
field = T3Field(name = name, value_formatter = ValueFormatter, table = self)
self._set_value_and_binding(field, v)
self._set_pattern(field, pattern)
if field.name in T3Table.__dict__ or field.name in self.__dict__:
raise TypeError("can't add field which has a T3Table attribute name: '%s'"%field.name)
return field
def _clear(self):
# NULLs values of T3Fields with ValueBindings. This causes a re-computation
# of values when the T3Table is updated.
for field in self._fields:
if field.value_binding:
if field.value is not None:
field.value = self._get_null_value()
elif isinstance(field.value, T3Table):
field.value._clear()
def _treecopy(self, memo):
table = self.__copy__()
memo[id(self)] = table
table.__doc__ = self.__doc__
for field in table._fields:
if isinstance(field.value, T3Table):
c = field.value._treecopy(memo)
field.value = c
c._parent = table
return table
def _update(self, name, value):
'''
:param name: name of T3Field to be updated
:param value: value to be assigned to T3Field
'''
self._get_root()._clear()
field = self.__getitem__(name)
if len(field) == 1:
if isinstance(value, T3List):
self._set_value_and_binding(field, value)
elif isinstance(value, (list, tuple)):
if len(value) == 1:
self._set_value_and_binding(field, value[0])
else:
raise TypeError("cannot unpack value %s"%value)
elif isinstance(value, T3Field):
value.name = name
self._set_value_and_binding(field, value)
self._set_pattern(field, field.pattern)
value.table = self
elif isinstance(value, T3Table):
self._set_value_and_binding(field, value)
value._parent = self
else:
self._set_value_and_binding(field, value)
elif isinstance(value, (list, tuple)):
if len(value) == len(field):
for i, r in enumerate(field):
self._set_value_and_binding(r, value[i])
elif len(value)<len(field):
if len(value) == 1:
raise ValueError("need more than 1 value to unpack. %d expected"%len(field))
else:
raise ValueError("need more than %d values to unpack. %d expected"%(len(value), len(field)))
else:
raise ValueError("too many values to unpack. %d expected. %d received."%(len(field), len(value)))
else:
pass # TBD
for field in self._fields:
if field.name!=name and field.value_binding:
field.value = self._get_null_value()
def _auto_parent(self):
for field in self._fields:
if isinstance(field.value, T3Table):
field.value._parent = self
def _to_string_top(self, name):
return name+":"
def _tostring(self, indent = 0):
S = []
for field in self._fields:
value = field.get_value()
if field.value_binding:
name = "$"+field.name
else:
name = field.name
if isinstance(value, T3Table):
S.append(indent*" "+value._to_string_top(name))
S+=value._tostring(indent+4)
elif value is not None:
S.append(indent*" "+name+": " + str(value))
return S
def __repr__(self):
name = ""
S = []
# TODO: this clause never used. Fix it or remove it.
if name:
S.append(self._to_string_top(name))
S+=self._tostring(4)
else:
if self._parent:
for field in self._parent._fields:
if isinstance(field.value, T3Table) and id(field.value) == id(self):
S.append(field.value._to_string_top(field.name))
break
else:
S.append(object.__repr__(self))
else:
S.append(object.__repr__(self))
S+=self._tostring(4)
return "\n".join(S)
################################# T3TableContext ################################
class T3TableContext(T3Table):
_cnt = 0
def __init__(self, name = None, default_valuetype = Hex, **options):
super(T3Response, self).__init__(default_valuetype, **options)
self._status = "OK"
self._name = name
def __enter__(self):
self._cnt+=1
return self
def __exit__(self, typ, value, tb):
if typ:
if typ in (AssertionError, MatchingFailure):
self._status = "FAIL"
self.fail_message(value)
else:
self._status = "ERROR"
self.error_message(value)
else:
self.ok_message(value)
def fail_message(self, value):
traceback.print_exc()
def error_message(self, value):
traceback.print_exc()
def ok_message(self, value):
pass
###################################### T3Set ###################################
class T3Set(T3Table):
def _set_pattern(self, field, P):
'''
Set P as a prefix for field.value if possible.
'''
if isinstance(field.value, t3.pattern.T3Pattern) and hasattr(P, "__int__"):
try:
P = field.value._coerce(P)
except AttributeError:
pass
prefix = t3.pattern.T3PatternValue(P)
field.pattern = t3.pattern.T3PatternPrefixed(prefix, field.value)
else:
super(T3Set, self)._set_pattern(field, P)
def add_pp(self, **prefixed_pattern):
key, value = prefixed_pattern.items()[0]
self.add(value._fields[0].value, **prefixed_pattern)
def match(self, data):
data = self._coerce(data)
R = data
table = self.__class__()
fields = [copy(field) for field in self._fields if field]
n = len(fields)
while True:
for i, field in enumerate(fields):
m = field.pattern.match(R)
if not m.fail:
field.value = m.value
table.add(field)
R = m.rest
break
else:
return T3Match(None, R, fail = True)
del fields[i]
# TODO: partial match is o.k. when R is NULL?
if fields and R:
continue
else:
table._auto_parent()
return T3Match(table, R)
###################################### T3Repeater ###################################
class T3Repeater(object):
def __init__(self, table, minimum = 1, maximum = MAXSIZE):
self.table = table
self._min = minimum
self._max = maximum
def match(self, data):
data = self.table._coerce(data)
m = T3Match(None, data)
R = m.rest
lst = T3List()
i = 0
while i<self._max:
m = self.table.match(R)
if m.fail:
if i<self._min:
return m
else:
return T3Match(lst, R)
else:
lst.append(m.value)
R = m.rest
i+=1
return T3Match(lst, R)
def __lshift__(self, data):
m = self.match(data)
if not m:
raise MatchingFailure(m)
else:
return m.value
###################################### T3List ###################################
class T3List(list):
def _coerce(self, rowvalue):
if isinstance(rowvalue, T3Number):
return rowvalue
else:
return Hex(rowvalue)
def get_value(self):
return Hex(self.join())
def join(self):
return reduce(lambda x, y: Hex(x) // Hex(y), self)
def __floordiv__(self, other):
if isinstance(other, T3List):
return T3List(self+other)
else:
return T3List(self+[other])
def match(self, data):
data = self._coerce(data)
m = T3Match(T3Number.NULL, data)
lst = T3List()
R = m.rest
for table in self:
m = table.match(R)
if m.fail:
return m
else:
lst.append(m.value)
R = m.rest
return T3Match(lst, R)
def __lshift__(self, data):
m = self.match(data)
if not m:
raise MatchingFailure(m)
else:
return m.value
def _repr_html_(self):
html = ["<table>"]
html.append("<tr>")
for col in self:
col = "<br>".join(str(col).split("\n"))
html.append("<td>{0}</td>".format(col))
html.append("</tr>")
html.append("</table>")
return ''.join(html)
##################################### T3Bitmap ###################################
class T3Bitmap(T3Table):
## TODO: T3Table has no kwargs
def __init__(self, **options):
super(T3Bitmap, self).__init__(**options)
self._bits = []
def _coerce(self, rowvalue):
if isinstance(rowvalue, T3Number):
return rowvalue
else:
return Bin(rowvalue)
def match(self, data):
if not (isinstance(data, T3Number) and data.base == 2):
bits = Bin(data)
k = len(bits)%8
if k:
bits.zfill(len(bits)+8-k)
else:
bits = data
m = super(T3Bitmap, self).match(bits)
if m.rest and isinstance(data, T3Number):
if data.base!=2:
R = data.__class__(m.rest.bytes(), data.base)
m.rest = R
return m
def add(self, pattern = None, **kwds):
if isinstance(pattern, int):
k = pattern
p = t3.pattern.T3PatternSection(k)
elif isinstance(pattern, (str, T3Number)):
k = int(pattern)
p = t3.pattern.T3PatternSection(k)
elif isinstance(pattern, T3Bitset):
k = pattern.count
p = pattern
else:
raise TypeError("cannot create bitpattern from object of type %s"%type(pattern))
for key, value in kwds.items():
if isinstance(value, (int, T3Number, str)):
kwds[key] = Bin(value)
field = self._new_field(p, kwds)
if field.name in T3Bitmap.__dict__ or field.name in self.__dict__:
raise TypeError("can't add field which has a T3Bitmap attribute name: '%s'"%field.name)
field.table = self
self._fields.append(field)
k = self._fieldnames.get(field.name, 0)
self._fieldnames[field.name] = k+1
return self
def _to_string_top(self, name):
return name+": %s"%Bin(self)
def get_value(self):
value = []
for field in self._fields:
if field:
p = field.pattern.count
v = Bin(field.get_value())
v = v.zfill(p)
value.append(v)
n = len(value)
if n == 0:
return self._get_null_value()
elif n == 1:
return value[0]
else:
return functools.reduce(lambda x,y: x // y, value)
##################################### T3Bitset ###################################
class T3Bitset(object):
def __init__(self, bitcount):
self.count = bitcount
self.fields = {}
def __copy__(self):
bitset = T3Bitset(self.count)
bitset.fields = self.fields.copy()
return bitset
def set(self, **fields):
for name, value in fields.items():
b = Bin(value).zfill(self.count)
assert len(b.digits()) == self.count, "Cannot set '%s = %s' with bitcount(%s) > %s"%(name, value, value, self.count)
self.fields[b.digits()] = name
def __call__(self, **fields):
bitset = self.__copy__()
bitset.set(**fields)
return bitset
def match(self, data):
if not (isinstance(data, T3Number) and data.base == 2):
bits = Bin(data)
k = len(bits)%8
if k:
bits.zfill(len(bits)+8-k)
else:
bits = data
value = bits[:self.count]
if len(value) == self.count:
name = self.fields.get(value.digits())
if name:
f = value.formatter
value.set_formatter(lambda n: f(n) + " ==> "+name)
m = T3Match(value, bits[self.count:])
else:
m = T3Match(None, data, fail = True)
if m.rest and isinstance(data, T3Number):
if data.base!=2:
R = data.__class__(m.rest.bytes(), data.base)
m.rest = R
return m
########### register types at ABCs ####################################################
# Types such as T3Bitmap or T3Set are automatically registere as subtypes of T3Table
T3Value.register(T3Table)
T3Value.register(T3Binding)
T3Value.register(T3Field)
T3Value.register(T3List)
T3Pattern.register(T3Table)
T3Pattern.register(T3Repeater)
T3Pattern.register(T3List)
T3Pattern.register(T3Bitset)
########################################################################################
#
# Tests
#
########################################################################################
def _build_tlv():
def update_len(v):
# v = binding.bound_value()
if v is not None:
try:
n = len(v.get_value())
except AttributeError:
n = len(v)
k = Hex(n)
if len(k) == 1:
if k>=0x80:
return 0x81 // k
else:
return k
else:
return (0x80 | len(k)) // k
def tag_size(tlv, data):
if data[0] & 0x1F == 0x1F:
return 2
else:
return 1
def len_size(tlv, data):
if data[0] & 0x80 == 0x80:
lenlen = data[0] & 0x0F
return 1+lenlen
return 1
def value_size(tlv, data):
if isinstance(tlv.Value, t3.pattern.T3Pattern):
return tlv.Value
if tlv.Len[0] & 0x80 == 0x80:
return int(tlv.Len[1:])
else:
return int(tlv.Len)
Tlv = T3Table()
Tlv.__doc__ = "TLV data structure"
Tlv.add(tag_size, Tag = "A5")
Tlv.add(len_size, Len = T3Binding(update_len, "*"))
Tlv.add(value_size, Value = "89 89")
return Tlv
def test_tlv():
print("call: test_tlv()")
Tlv = _build_tlv()
Tlv << "A7 02 03 05 06"
assert Tlv.get_value() == "A5 02 89 89"
assert Hex(Tlv) == "A5 02 89 89"
assert Tlv.Len == 2
assert Tlv.Value == "89 89"
Tlv.Value = "00"*0x80
# print len(Tlv._fields[2].table._fields)
Tlv << "A7 02 03 05 06"
assert Tlv.Len == "81 80"
Tlv2 = copy(Tlv)
Tlv2.Value = "00"
assert Tlv2.Len == 1
Tlv3 = Tlv2(Tag = "A6")
assert Tlv3.Tag == 0xA6
try:
Tlv3.add(1, _fields = 0)
assert False, "TypeError exception not raised"
except TypeError:
pass
Tlv2.Value = Tlv3
assert Hex(Tlv2.Value(Value = "89 AF")) == 'A5 04 A6 02 89 AF'
TlArray = T3Table()
TlArray.add(Tag = 0x9A)
TlArray.add(Len = 0x04)
TlArray.add(Tag = 0x5F0A)
TlArray.add(Len = 0x02)
TlArray.add(Tag = 0x8A)
TlArray.add(Len = 0x08)
assert len(TlArray["Len"]) == 3
assert TlArray.Len == [0x04, 0x02, 0x08]
assert len(TlArray["Tag"]) == 3
assert TlArray.Tag == [0x9A, 0x5F0A, 0x8A]
dol = TlArray(Tag = [0x95, 0x5F0A, 0x8A])
assert len(list(zip(dol.Tag, dol.Len))) == 3
Tlv4 = Tlv << "A7 02 03 05 06"
assert Tlv4.Tag == "A7"
assert Tlv4.Len == "02"
assert Tlv4.Value == "03 05"
Tlv4.Value = "03 05 06"
assert Tlv4.Len == "03"
Tlv4.Value = "03 05 06 07"
assert Tlv4.Len == "04"
Tlv5 = Tlv4(Len = T3Field(pattern = '05', value = 0x05))
assert (Tlv5 << 'A0 05 01 02 03 04 05').Len == '05'
try:
Tlv5 << "A7 04 01 02 03 04"
except t3.pattern.MatchingFailure:
pass
else:
assert False, "MatchingFailure exception not raised"
A = T3Table()
A.add(B = 0x00)
A.add(C = 0x01)
A.C = A()
assert Hex(A.C(B = 0x78)) == '00 78 01'
assert copy(A.C).B == 0x00
assert copy(A.C).C == 0x01
RApdu = T3Table()
RApdu.add("*", Data = '00')
RApdu.add(1, Le = None)
RApdu.add(2, SW = '00 00')
Tlv.Value = "00 00 00"
r = RApdu << '00 01 02 00 67 90 00'
assert r.SW == 0x9000
assert r.Data == '00 01 02 00 67'
r = RApdu(Le="00") << '00 01 02 00 67 90 00'
assert r.SW == 0x9000
assert r.Le == "67"
assert r.Data == '00 01 02 00'
T1 = Tlv(Tag = 0x78)
T2 = Tlv(Tag = 0xA6)
ts = T3Set()
ts.add(0x78, T1 = T1)
ts.add(0xA6, T2 = T2)
tree = ts << '78 01 06 A6 03 01 02 04'
assert tree.T1.Tag == '78'
assert tree.T2.Tag == 'A6'
assert Hex(tree.T1(Value = 0x07)) == '78 01 07 A6 03 01 02 04'
tree = ts << 'A6 03 01 02 04 78 01 06'
assert Hex(tree) == 'A6 03 01 02 04 78 01 06'
tree.T1.Value = '05 06'
assert Hex(tree) == 'A6 03 01 02 04 78 02 05 06'
def test_set():
print("call: test_set()")
Tlv = _build_tlv()
X1 = T3Set()
X1.add(0x78, F_87 = Tlv(Tag = 0x78))
X1.add(0xA6, F_A6 = Tlv(Tag = 0xA6, Value = 'AA'))
X = X1()
H = Hex(X)
X << H
X2 = T3Set()
X2.add(0x9F01, F_9F01 = Tlv(Tag = 0x9F01))
X2.add(0x9F02, F_9F02 = Tlv(Tag = 0x9F02))
X2.add(0x9F03, F_9F03 = Tlv(Tag = 0x9F03))
Y1 = Tlv(Tag = 0x8C, Value = X1)
Y2 = Tlv(Tag = 0x8D, Value = X2)
Y = T3Set()
Y.add(0x8C, F_8C = Y1)
Y.add(0x8D, F_8D = Y2)
T = T3Set()
T.add(0xA5, Value = Tlv(Tag = 0xA5, Value = Y))
F_8C = T.find("F_8C")
n = F_8C.Len
F_A6 = T.find("F_A6")
assert len(F_A6.Value) == 1
F_A6.Value = "01 02 03 04"
assert F_8C.Len == n + 3
R = F_A6(Value = "01 02 03 04 05")
assert F_8C.Len == n + 3
assert R.find("F_8C").Len == n + 4
F_A6.Value = "01"
R = T << Hex(T)
assert Hex(T) == Hex(R)
R2 = R()
R3 = R2 << Hex(R2)
assert Hex(R2) == Hex(R3)
F_8C = R.find("F_8C")
n = F_8C.Len
F_A6 = R.find("F_A6")
assert len(F_A6.Value) == 1
F_A6.Value = "01 02 03 04"
assert F_8C.Len == n + 3