Explicitly mention about impl/expl class attributes

[pyderasn.git] / pyderasn.py

diff --git a/pyderasn.py b/pyderasn.py
index 3868b61f60874d7c95b39e451be894cbe2f95258..92c18240c923115b6bed263ccdd2a9a10d6d6193 100755 (executable)
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -1,12 +1,11 @@
 #!/usr/bin/env python
 # coding: utf-8
 # PyDERASN -- Python ASN.1 DER/BER codec with abstract structures
 #!/usr/bin/env python
 # coding: utf-8
 # PyDERASN -- Python ASN.1 DER/BER codec with abstract structures

-# Copyright (C) 2017-2019 Sergey Matveev <stargrave@stargrave.org>
+# Copyright (C) 2017-2020 Sergey Matveev <stargrave@stargrave.org>

 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU Lesser General Public License as

-# published by the Free Software Foundation, either version 3 of the
-# License, or (at your option) any later version.
+# published by the Free Software Foundation, version 3 of the License.

 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 #
 # This program is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of


@@ -14,8 +13,7 @@
 # GNU Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public
 # GNU Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public

-# License along with this program.  If not, see
-# <http://www.gnu.org/licenses/>.
+# License along with this program.  If not, see <http://www.gnu.org/licenses/>.

 """Python ASN.1 DER/BER codec with abstract structures
 
 This library allows you to marshal various structures in ASN.1 DER
 """Python ASN.1 DER/BER codec with abstract structures
 
 This library allows you to marshal various structures in ASN.1 DER


@@ -67,10 +65,11 @@ ____
 
 Most types in ASN.1 has specific tag for them. ``Obj.tag_default`` is
 the default tag used during coding process. You can override it with
 
 Most types in ASN.1 has specific tag for them. ``Obj.tag_default`` is
 the default tag used during coding process. You can override it with

-either ``IMPLICIT`` (using ``impl`` keyword argument), or
-``EXPLICIT`` one (using ``expl`` keyword argument). Both arguments take
-raw binary string, containing that tag. You can **not** set implicit and
-explicit tags simultaneously.
+either ``IMPLICIT`` (using either ``impl`` keyword argument or ``impl``
+class attribute), or ``EXPLICIT`` one (using either ``expl`` keyword
+argument or ``expl`` class attribute). Both arguments take raw binary
+string, containing that tag. You can **not** set implicit and explicit
+tags simultaneously.

 
 There are :py:func:`pyderasn.tag_ctxp` and :py:func:`pyderasn.tag_ctxc`
 functions, allowing you to easily create ``CONTEXT``
 
 There are :py:func:`pyderasn.tag_ctxp` and :py:func:`pyderasn.tag_ctxc`
 functions, allowing you to easily create ``CONTEXT``


@@ -348,6 +347,8 @@ DEFINED BY some previously met ObjectIdentifier. This library provides
 ability to specify mapping between some OID and field that must be
 decoded with specific specification.
 
 ability to specify mapping between some OID and field that must be
 decoded with specific specification.
 

+.. _defines:
+

 defines kwarg
 _____________
 
 defines kwarg
 _____________
 


@@ -421,8 +422,8 @@ value must be sequence of following tuples::
 
 where ``decode_path`` is a tuple holding so-called decode path to the
 exact :py:class:`pyderasn.ObjectIdentifier` field you want to apply
 
 where ``decode_path`` is a tuple holding so-called decode path to the
 exact :py:class:`pyderasn.ObjectIdentifier` field you want to apply

-``defines``, holding exactly the same value as accepted in its keyword
-argument.
+``defines``, holding exactly the same value as accepted in its
+:ref:`keyword argument <defines>`.

 
 For example, again for CMS, you want to automatically decode
 ``SignedData`` and CMC's (:rfc:`5272`) ``PKIData`` and ``PKIResponse``
 
 For example, again for CMS, you want to automatically decode
 ``SignedData`` and CMC's (:rfc:`5272`) ``PKIData`` and ``PKIResponse``


@@ -517,6 +518,11 @@ lengths will be invalid in that case.
    This option should be used only for skipping some decode errors, just
    to see the decoded structure somehow.
 
    This option should be used only for skipping some decode errors, just
    to see the decoded structure somehow.
 

+Base Obj
+--------
+.. autoclass:: pyderasn.Obj
+   :members:
+

 Primitive types
 ---------------
 
 Primitive types
 ---------------
 


@@ -565,6 +571,7 @@ _____________
 PrintableString
 _______________
 .. autoclass:: pyderasn.PrintableString
 PrintableString
 _______________
 .. autoclass:: pyderasn.PrintableString

+   :members: __init__

 
 UTCTime
 _______
 
 UTCTime
 _______


@@ -626,10 +633,10 @@ Various
 .. autofunction:: pyderasn.tag_decode
 .. autofunction:: pyderasn.tag_ctxp
 .. autofunction:: pyderasn.tag_ctxc
 .. autofunction:: pyderasn.tag_decode
 .. autofunction:: pyderasn.tag_ctxp
 .. autofunction:: pyderasn.tag_ctxc

-.. autoclass:: pyderasn.Obj

 .. autoclass:: pyderasn.DecodeError
    :members: __init__
 .. autoclass:: pyderasn.NotEnoughData
 .. autoclass:: pyderasn.DecodeError
    :members: __init__
 .. autoclass:: pyderasn.NotEnoughData

+.. autoclass:: pyderasn.ExceedingData

 .. autoclass:: pyderasn.LenIndefForm
 .. autoclass:: pyderasn.TagMismatch
 .. autoclass:: pyderasn.InvalidLength
 .. autoclass:: pyderasn.LenIndefForm
 .. autoclass:: pyderasn.TagMismatch
 .. autoclass:: pyderasn.InvalidLength


@@ -650,6 +657,7 @@ from math import ceil
 from os import environ
 from string import ascii_letters
 from string import digits
 from os import environ
 from string import ascii_letters
 from string import digits

+from unicodedata import category as unicat

 
 from six import add_metaclass
 from six import binary_type
 
 from six import add_metaclass
 from six import binary_type


@@ -673,6 +681,7 @@ except ImportError:  # pragma: no cover
     def colored(what, *args, **kwargs):
         return what
 
     def colored(what, *args, **kwargs):
         return what
 

+__version__ = "5.6"

 
 __all__ = (
     "Any",
 
 __all__ = (
     "Any",


@@ -684,6 +693,7 @@ __all__ = (
     "DecodeError",
     "DecodePathDefBy",
     "Enumerated",
     "DecodeError",
     "DecodePathDefBy",
     "Enumerated",

+    "ExceedingData",

     "GeneralizedTime",
     "GeneralString",
     "GraphicString",
     "GeneralizedTime",
     "GeneralString",
     "GraphicString",


@@ -794,6 +804,18 @@ class NotEnoughData(DecodeError):
     pass
 
 
     pass
 
 

+class ExceedingData(ASN1Error):
+    def __init__(self, nbytes):
+        super(ExceedingData, self).__init__()
+        self.nbytes = nbytes
+
+    def __str__(self):
+        return "%d trailing bytes" % self.nbytes
+
+    def __repr__(self):
+        return "%s(%s)" % (self.__class__.__name__, self)
+
+

 class LenIndefForm(DecodeError):
     pass
 
 class LenIndefForm(DecodeError):
     pass
 


@@ -1019,9 +1041,9 @@ def len_decode(data):
 ########################################################################
 
 class AutoAddSlots(type):
 ########################################################################
 
 class AutoAddSlots(type):

-    def __new__(mcs, name, bases, _dict):
+    def __new__(cls, name, bases, _dict):

         _dict["__slots__"] = _dict.get("__slots__", ())
         _dict["__slots__"] = _dict.get("__slots__", ())

-        return type.__new__(mcs, name, bases, _dict)
+        return type.__new__(cls, name, bases, _dict)

 
 
 @add_metaclass(AutoAddSlots)
 
 
 @add_metaclass(AutoAddSlots)


@@ -1095,10 +1117,14 @@ class Obj(object):
 
     @property
     def tlen(self):
 
     @property
     def tlen(self):

+        """See :ref:`decoding`
+        """

         return len(self.tag)
 
     @property
     def tlvlen(self):
         return len(self.tag)
 
     @property
     def tlvlen(self):

+        """See :ref:`decoding`
+        """

         return self.tlen + self.llen + self.vlen
 
     def __str__(self):  # pragma: no cover
         return self.tlen + self.llen + self.vlen
 
     def __str__(self):  # pragma: no cover


@@ -1123,6 +1149,10 @@ class Obj(object):
         raise NotImplementedError()
 
     def encode(self):
         raise NotImplementedError()
 
     def encode(self):

+        """Encode the structure
+
+        :returns: DER representation
+        """

         raw = self._encode()
         if self._expl is None:
             return raw
         raw = self._encode()
         if self._expl is None:
             return raw


@@ -1150,6 +1180,8 @@ class Obj(object):
                          determine if tag satisfies the scheme)
         :param _ctx_immutable: do we need to copy ``ctx`` before using it
         :returns: (Obj, remaining data)
                          determine if tag satisfies the scheme)
         :param _ctx_immutable: do we need to copy ``ctx`` before using it
         :returns: (Obj, remaining data)

+
+        .. seealso:: :ref:`decoding`

         """
         if ctx is None:
             ctx = {}
         """
         if ctx is None:
             ctx = {}


@@ -1165,7 +1197,7 @@ class Obj(object):
                 tag_only=tag_only,
             )
             if tag_only:
                 tag_only=tag_only,
             )
             if tag_only:

-                return
+                return None

             obj, tail = result
         else:
             try:
             obj, tail = result
         else:
             try:


@@ -1203,7 +1235,7 @@ class Obj(object):
                     tag_only=tag_only,
                 )
                 if tag_only:  # pragma: no cover
                     tag_only=tag_only,
                 )
                 if tag_only:  # pragma: no cover

-                    return
+                    return None

                 obj, tail = result
                 eoc_expected, tail = tail[:EOC_LEN], tail[EOC_LEN:]
                 if eoc_expected.tobytes() != EOC:
                 obj, tail = result
                 eoc_expected, tail = tail[:EOC_LEN], tail[EOC_LEN:]
                 if eoc_expected.tobytes() != EOC:


@@ -1238,7 +1270,7 @@ class Obj(object):
                     tag_only=tag_only,
                 )
                 if tag_only:  # pragma: no cover
                     tag_only=tag_only,
                 )
                 if tag_only:  # pragma: no cover

-                    return
+                    return None

                 obj, tail = result
                 if obj.tlvlen < l and not ctx.get("allow_expl_oob", False):
                     raise DecodeError(
                 obj, tail = result
                 if obj.tlvlen < l and not ctx.get("allow_expl_oob", False):
                     raise DecodeError(


@@ -1249,48 +1281,86 @@ class Obj(object):
                     )
         return obj, (tail if leavemm else tail.tobytes())
 
                     )
         return obj, (tail if leavemm else tail.tobytes())
 

+    def decod(self, data, offset=0, decode_path=(), ctx=None):
+        """Decode the data, check that tail is empty
+
+        :raises ExceedingData: if tail is not empty
+
+        This is just a wrapper over :py:meth:`pyderasn.Obj.decode`
+        (decode without tail) that also checks that there is no
+        trailing data left.
+        """
+        obj, tail = self.decode(
+            data,
+            offset=offset,
+            decode_path=decode_path,
+            ctx=ctx,
+            leavemm=True,
+        )
+        if len(tail) > 0:
+            raise ExceedingData(len(tail))
+        return obj
+

     @property
     def expled(self):
     @property
     def expled(self):

+        """See :ref:`decoding`
+        """

         return self._expl is not None
 
     @property
     def expl_tag(self):
         return self._expl is not None
 
     @property
     def expl_tag(self):

+        """See :ref:`decoding`
+        """

         return self._expl
 
     @property
     def expl_tlen(self):
         return self._expl
 
     @property
     def expl_tlen(self):

+        """See :ref:`decoding`
+        """

         return len(self._expl)
 
     @property
     def expl_llen(self):
         return len(self._expl)
 
     @property
     def expl_llen(self):

+        """See :ref:`decoding`
+        """

         if self.expl_lenindef:
             return 1
         return len(len_encode(self.tlvlen))
 
     @property
     def expl_offset(self):
         if self.expl_lenindef:
             return 1
         return len(len_encode(self.tlvlen))
 
     @property
     def expl_offset(self):

+        """See :ref:`decoding`
+        """

         return self.offset - self.expl_tlen - self.expl_llen
 
     @property
     def expl_vlen(self):
         return self.offset - self.expl_tlen - self.expl_llen
 
     @property
     def expl_vlen(self):

+        """See :ref:`decoding`
+        """

         return self.tlvlen
 
     @property
     def expl_tlvlen(self):
         return self.tlvlen
 
     @property
     def expl_tlvlen(self):

+        """See :ref:`decoding`
+        """

         return self.expl_tlen + self.expl_llen + self.expl_vlen
 
     @property
     def fulloffset(self):
         return self.expl_tlen + self.expl_llen + self.expl_vlen
 
     @property
     def fulloffset(self):

+        """See :ref:`decoding`
+        """

         return self.expl_offset if self.expled else self.offset
 
     @property
     def fulllen(self):
         return self.expl_offset if self.expled else self.offset
 
     @property
     def fulllen(self):

+        """See :ref:`decoding`
+        """

         return self.expl_tlvlen if self.expled else self.tlvlen
 
     def pps_lenindef(self, decode_path):
         if self.lenindef and not (
         return self.expl_tlvlen if self.expled else self.tlvlen
 
     def pps_lenindef(self, decode_path):
         if self.lenindef and not (

-            getattr(self, "defined", None) is not None and
-            self.defined[1].lenindef
+                getattr(self, "defined", None) is not None and
+                self.defined[1].lenindef

         ):
             yield _pp(
                 asn1_type_name="EOC",
         ):
             yield _pp(
                 asn1_type_name="EOC",


@@ -1577,10 +1647,10 @@ def pprint(
         for pp in pps:
             if hasattr(pp, "_fields"):
                 if (
         for pp in pps:
             if hasattr(pp, "_fields"):
                 if (

-                    decode_path_only != () and
-                    tuple(
-                        str(p) for p in pp.decode_path[:len(decode_path_only)]
-                    ) != decode_path_only
+                        decode_path_only != () and
+                        tuple(
+                            str(p) for p in pp.decode_path[:len(decode_path_only)]
+                        ) != decode_path_only

                 ):
                     continue
                 if big_blobs:
                 ):
                     continue
                 if big_blobs:


@@ -1594,8 +1664,8 @@ def pprint(
                         decode_path_len_decrease=len(decode_path_only),
                     )
                     for row in pp_console_blob(
                         decode_path_len_decrease=len(decode_path_only),
                     )
                     for row in pp_console_blob(

-                        pp,
-                        decode_path_len_decrease=len(decode_path_only),
+                            pp,
+                            decode_path_len_decrease=len(decode_path_only),

                     ):
                         yield row
                 else:
                     ):
                         yield row
                 else:


@@ -1747,7 +1817,7 @@ class Boolean(Obj):
                 offset=offset,
             )
         if tag_only:
                 offset=offset,
             )
         if tag_only:

-            return
+            return None

         try:
             l, _, v = len_decode(lv)
         except DecodeError as err:
         try:
             l, _, v = len_decode(lv)
         except DecodeError as err:


@@ -1977,6 +2047,7 @@ class Integer(Obj):
         for name, value in iteritems(self.specs):
             if value == self._value:
                 return name
         for name, value in iteritems(self.specs):
             if value == self._value:
                 return name

+        return None

 
     def __call__(
             self,
 
     def __call__(
             self,


@@ -2056,7 +2127,7 @@ class Integer(Obj):
                 offset=offset,
             )
         if tag_only:
                 offset=offset,
             )
         if tag_only:

-            return
+            return None

         try:
             l, llen, v = len_decode(lv)
         except DecodeError as err:
         try:
             l, llen, v = len_decode(lv)
         except DecodeError as err:


@@ -2276,7 +2347,7 @@ class BitString(Obj):
                     if not frozenset(value) <= SET01:
                         raise ValueError("B's coding contains unacceptable chars")
                     return self._bits2octets(value)
                     if not frozenset(value) <= SET01:
                         raise ValueError("B's coding contains unacceptable chars")
                     return self._bits2octets(value)

-                elif value.endswith("'H"):
+                if value.endswith("'H"):

                     value = value[1:-2]
                     return (
                         len(value) * 4,
                     value = value[1:-2]
                     return (
                         len(value) * 4,


@@ -2284,8 +2355,7 @@ class BitString(Obj):
                     )
             if isinstance(value, binary_type):
                 return (len(value) * 8, value)
                     )
             if isinstance(value, binary_type):
                 return (len(value) * 8, value)

-            else:
-                raise InvalidValueType((self.__class__, string_types, binary_type))
+            raise InvalidValueType((self.__class__, string_types, binary_type))

         if isinstance(value, tuple):
             if (
                     len(value) == 2 and
         if isinstance(value, tuple):
             if (
                     len(value) == 2 and


@@ -2404,7 +2474,7 @@ class BitString(Obj):
             octets,
         ))
 
             octets,
         ))
 

-    def _decode_chunk(self, lv, offset, decode_path, ctx):
+    def _decode_chunk(self, lv, offset, decode_path):

         try:
             l, llen, v = len_decode(lv)
         except DecodeError as err:
         try:
             l, llen, v = len_decode(lv)
         except DecodeError as err:


@@ -2474,8 +2544,8 @@ class BitString(Obj):
             )
         if t == self.tag:
             if tag_only:  # pragma: no cover
             )
         if t == self.tag:
             if tag_only:  # pragma: no cover

-                return
-            return self._decode_chunk(lv, offset, decode_path, ctx)
+                return None
+            return self._decode_chunk(lv, offset, decode_path)

         if t == self.tag_constructed:
             if not ctx.get("bered", False):
                 raise DecodeError(
         if t == self.tag_constructed:
             if not ctx.get("bered", False):
                 raise DecodeError(


@@ -2485,7 +2555,7 @@ class BitString(Obj):
                     offset=offset,
                 )
             if tag_only:  # pragma: no cover
                     offset=offset,
                 )
             if tag_only:  # pragma: no cover

-                return
+                return None

             lenindef = False
             try:
                 l, llen, v = len_decode(lv)
             lenindef = False
             try:
                 l, llen, v = len_decode(lv)


@@ -2683,13 +2753,7 @@ class OctetString(Obj):
         :param default: set default value. Type same as in ``value``
         :param bool optional: is object ``OPTIONAL`` in sequence
         """
         :param default: set default value. Type same as in ``value``
         :param bool optional: is object ``OPTIONAL`` in sequence
         """

-        super(OctetString, self).__init__(
-            impl,
-            expl,
-            default,
-            optional,
-            _decoded,
-        )
+        super(OctetString, self).__init__(impl, expl, default, optional, _decoded)

         self._value = value
         self._bound_min, self._bound_max = getattr(
             self,
         self._value = value
         self._bound_min, self._bound_max = getattr(
             self,


@@ -2794,7 +2858,7 @@ class OctetString(Obj):
             self._value,
         ))
 
             self._value,
         ))
 

-    def _decode_chunk(self, lv, offset, decode_path, ctx):
+    def _decode_chunk(self, lv, offset, decode_path):

         try:
             l, llen, v = len_decode(lv)
         except DecodeError as err:
         try:
             l, llen, v = len_decode(lv)
         except DecodeError as err:


@@ -2850,8 +2914,8 @@ class OctetString(Obj):
             )
         if t == self.tag:
             if tag_only:
             )
         if t == self.tag:
             if tag_only:

-                return
-            return self._decode_chunk(lv, offset, decode_path, ctx)
+                return None
+            return self._decode_chunk(lv, offset, decode_path)

         if t == self.tag_constructed:
             if not ctx.get("bered", False):
                 raise DecodeError(
         if t == self.tag_constructed:
             if not ctx.get("bered", False):
                 raise DecodeError(


@@ -2861,7 +2925,7 @@ class OctetString(Obj):
                     offset=offset,
                 )
             if tag_only:
                     offset=offset,
                 )
             if tag_only:

-                return
+                return None

             lenindef = False
             try:
                 l, llen, v = len_decode(lv)
             lenindef = False
             try:
                 l, llen, v = len_decode(lv)


@@ -3077,7 +3141,7 @@ class Null(Obj):
                 offset=offset,
             )
         if tag_only:  # pragma: no cover
                 offset=offset,
             )
         if tag_only:  # pragma: no cover

-            return
+            return None

         try:
             l, _, v = len_decode(lv)
         except DecodeError as err:
         try:
             l, _, v = len_decode(lv)
         except DecodeError as err:


@@ -3179,13 +3243,7 @@ class ObjectIdentifier(Obj):
         :param default: set default value. Type same as in ``value``
         :param bool optional: is object ``OPTIONAL`` in sequence
         """
         :param default: set default value. Type same as in ``value``
         :param bool optional: is object ``OPTIONAL`` in sequence
         """

-        super(ObjectIdentifier, self).__init__(
-            impl,
-            expl,
-            default,
-            optional,
-            _decoded,
-        )
+        super(ObjectIdentifier, self).__init__(impl, expl, default, optional, _decoded)

         self._value = value
         if value is not None:
             self._value = self._value_sanitize(value)
         self._value = value
         if value is not None:
             self._value = self._value_sanitize(value)


@@ -3332,7 +3390,7 @@ class ObjectIdentifier(Obj):
                 offset=offset,
             )
         if tag_only:  # pragma: no cover
                 offset=offset,
             )
         if tag_only:  # pragma: no cover

-            return
+            return None

         try:
             l, llen, v = len_decode(lv)
         except DecodeError as err:
         try:
             l, llen, v = len_decode(lv)
         except DecodeError as err:


@@ -3456,13 +3514,7 @@ class Enumerated(Integer):
             bounds=None,  # dummy argument, workability for Integer.decode
     ):
         super(Enumerated, self).__init__(
             bounds=None,  # dummy argument, workability for Integer.decode
     ):
         super(Enumerated, self).__init__(

-            value=value,
-            impl=impl,
-            expl=expl,
-            default=default,
-            optional=optional,
-            _specs=_specs,
-            _decoded=_decoded,
+            value, bounds, impl, expl, default, optional, _specs, _decoded,

         )
         if len(self.specs) == 0:
             raise ValueError("schema must be specified")
         )
         if len(self.specs) == 0:
             raise ValueError("schema must be specified")


@@ -3523,6 +3575,12 @@ class Enumerated(Integer):
         )
 
 
         )
 
 

+def escape_control_unicode(c):
+    if unicat(c).startswith("C"):
+        c = repr(c).lstrip("u").strip("'")
+    return c
+
+

 class CommonString(OctetString):
     """Common class for all strings
 
 class CommonString(OctetString):
     """Common class for all strings
 


@@ -3585,7 +3643,7 @@ class CommonString(OctetString):
        * - :py:class:`pyderasn.BMPString`
          - utf-16-be
     """
        * - :py:class:`pyderasn.BMPString`
          - utf-16-be
     """

-    __slots__ = ("encoding",)
+    __slots__ = ()

 
     def _value_sanitize(self, value):
         value_raw = None
 
     def _value_sanitize(self, value):
         value_raw = None


@@ -3641,7 +3699,10 @@ class CommonString(OctetString):
     def pps(self, decode_path=(), no_unicode=False):
         value = None
         if self.ready:
     def pps(self, decode_path=(), no_unicode=False):
         value = None
         if self.ready:

-            value = hexenc(bytes(self)) if no_unicode else self.__unicode__()
+            value = (
+                hexenc(bytes(self)) if no_unicode else
+                "".join(escape_control_unicode(c) for c in self.__unicode__())
+            )

         yield _pp(
             obj=self,
             asn1_type_name=self.asn1_type_name,
         yield _pp(
             obj=self,
             asn1_type_name=self.asn1_type_name,


@@ -3720,6 +3781,32 @@ class PrintableString(AllowableCharsMixin, CommonString):
     _allowable_chars = frozenset(
         (ascii_letters + digits + " '()+,-./:=?").encode("ascii")
     )
     _allowable_chars = frozenset(
         (ascii_letters + digits + " '()+,-./:=?").encode("ascii")
     )

+    _asterisk = frozenset("*".encode("ascii"))
+    _ampersand = frozenset("&".encode("ascii"))
+
+    def __init__(
+            self,
+            value=None,
+            bounds=None,
+            impl=None,
+            expl=None,
+            default=None,
+            optional=False,
+            _decoded=(0, 0, 0),
+            allow_asterisk=False,
+            allow_ampersand=False,
+    ):
+        """
+        :param allow_asterisk: allow asterisk character
+        :param allow_ampersand: allow ampersand character
+        """
+        if allow_asterisk:
+            self._allowable_chars |= self._asterisk
+        if allow_ampersand:
+            self._allowable_chars |= self._ampersand
+        super(PrintableString, self).__init__(
+            value, bounds, impl, expl, default, optional, _decoded,
+        )

 
     def _value_sanitize(self, value):
         value = super(PrintableString, self)._value_sanitize(value)
 
     def _value_sanitize(self, value):
         value = super(PrintableString, self)._value_sanitize(value)


@@ -3727,6 +3814,34 @@ class PrintableString(AllowableCharsMixin, CommonString):
             raise DecodeError("non-printable value")
         return value
 
             raise DecodeError("non-printable value")
         return value
 

+    def copy(self):
+        obj = super(PrintableString, self).copy()
+        obj._allowable_chars = self._allowable_chars
+        return obj
+
+    def __call__(
+            self,
+            value=None,
+            bounds=None,
+            impl=None,
+            expl=None,
+            default=None,
+            optional=None,
+    ):
+        return self.__class__(
+            value=value,
+            bounds=(
+                (self._bound_min, self._bound_max)
+                if bounds is None else bounds
+            ),
+            impl=self.tag if impl is None else impl,
+            expl=self._expl if expl is None else expl,
+            default=self.default if default is None else default,
+            optional=self.optional if optional is None else optional,
+            allow_asterisk=self._asterisk <= self._allowable_chars,
+            allow_ampersand=self._ampersand <= self._allowable_chars,
+        )
+

 
 class TeletexString(CommonString):
     __slots__ = ()
 
 class TeletexString(CommonString):
     __slots__ = ()


@@ -3801,11 +3916,7 @@ class UTCTime(CommonString):
         :param bool optional: is object ``OPTIONAL`` in sequence
         """
         super(UTCTime, self).__init__(
         :param bool optional: is object ``OPTIONAL`` in sequence
         """
         super(UTCTime, self).__init__(

-            impl=impl,
-            expl=expl,
-            default=default,
-            optional=optional,
-            _decoded=_decoded,
+            None, None, impl, expl, default, optional, _decoded,

         )
         self._value = value
         if value is not None:
         )
         self._value = value
         if value is not None:


@@ -4250,7 +4361,7 @@ class Choice(Obj):
                 offset=offset,
             )
         if tag_only:  # pragma: no cover
                 offset=offset,
             )
         if tag_only:  # pragma: no cover

-            return
+            return None

         value, tail = spec.decode(
             tlv,
             offset=offset,
         value, tail = spec.decode(
             tlv,
             offset=offset,


@@ -4476,7 +4587,7 @@ class Any(Obj):
                 _decoded=(offset, 0, tlvlen),
             )
             obj.lenindef = True
                 _decoded=(offset, 0, tlvlen),
             )
             obj.lenindef = True

-            obj.tag = t
+            obj.tag = t.tobytes()

             return obj, v[EOC_LEN:]
         except DecodeError as err:
             raise err.__class__(
             return obj, v[EOC_LEN:]
         except DecodeError as err:
             raise err.__class__(


@@ -4500,7 +4611,7 @@ class Any(Obj):
             optional=self.optional,
             _decoded=(offset, 0, tlvlen),
         )
             optional=self.optional,
             _decoded=(offset, 0, tlvlen),
         )

-        obj.tag = t
+        obj.tag = t.tobytes()

         return obj, tail
 
     def __repr__(self):
         return obj, tail
 
     def __repr__(self):


@@ -4719,9 +4830,8 @@ class Sequence(Obj):
                 if spec.optional:
                     continue
                 return False
                 if spec.optional:
                     continue
                 return False

-            else:
-                if not value.ready:
-                    return False
+            if not value.ready:
+                return False

         return True
 
     @property
         return True
 
     @property


@@ -4833,7 +4943,7 @@ class Sequence(Obj):
                 offset=offset,
             )
         if tag_only:  # pragma: no cover
                 offset=offset,
             )
         if tag_only:  # pragma: no cover

-            return
+            return None

         lenindef = False
         ctx_bered = ctx.get("bered", False)
         try:
         lenindef = False
         ctx_bered = ctx.get("bered", False)
         try:


@@ -4885,8 +4995,8 @@ class Sequence(Obj):
                     ctx=ctx,
                     _ctx_immutable=False,
                 )
                     ctx=ctx,
                     _ctx_immutable=False,
                 )

-            except TagMismatch:
-                if spec.optional:
+            except TagMismatch as err:
+                if (len(err.decode_path) == len(decode_path) + 1) and spec.optional:

                     continue
                 raise
 
                     continue
                 raise
 


@@ -5083,7 +5193,7 @@ class Set(Sequence):
                 offset=offset,
             )
         if tag_only:
                 offset=offset,
             )
         if tag_only:

-            return
+            return None

         lenindef = False
         ctx_bered = ctx.get("bered", False)
         try:
         lenindef = False
         ctx_bered = ctx.get("bered", False)
         try:


@@ -5255,13 +5365,7 @@ class SequenceOf(Obj):
             optional=False,
             _decoded=(0, 0, 0),
     ):
             optional=False,
             _decoded=(0, 0, 0),
     ):

-        super(SequenceOf, self).__init__(
-            impl,
-            expl,
-            default,
-            optional,
-            _decoded,
-        )
+        super(SequenceOf, self).__init__(impl, expl, default, optional, _decoded)

         if schema is None:
             schema = getattr(self, "schema", None)
         if schema is None:
         if schema is None:
             schema = getattr(self, "schema", None)
         if schema is None:


@@ -5416,7 +5520,7 @@ class SequenceOf(Obj):
                 offset=offset,
             )
         if tag_only:
                 offset=offset,
             )
         if tag_only:

-            return
+            return None

         lenindef = False
         ctx_bered = ctx.get("bered", False)
         try:
         lenindef = False
         ctx_bered = ctx.get("bered", False)
         try:


@@ -5621,8 +5725,8 @@ def generic_decoder():  # pragma: no cover
             for pp in pps:
                 if hasattr(pp, "_fields"):
                     if (
             for pp in pps:
                 if hasattr(pp, "_fields"):
                     if (

-                        decode_path_only != () and
-                        pp.decode_path[:len(decode_path_only)] != decode_path_only
+                            decode_path_only != () and
+                            pp.decode_path[:len(decode_path_only)] != decode_path_only

                     ):
                         continue
                     if pp.asn1_type_name == Choice.asn1_type_name:
                     ):
                         continue
                     if pp.asn1_type_name == Choice.asn1_type_name:


@@ -5640,8 +5744,8 @@ def generic_decoder():  # pragma: no cover
                         decode_path_len_decrease=len(decode_path_only),
                     )
                     for row in pp_console_blob(
                         decode_path_len_decrease=len(decode_path_only),
                     )
                     for row in pp_console_blob(

-                        pp,
-                        decode_path_len_decrease=len(decode_path_only),
+                            pp,
+                            decode_path_len_decrease=len(decode_path_only),

                     ):
                         yield row
                 else:
                     ):
                         yield row
                 else:


@@ -5720,7 +5824,7 @@ def main():  # pragma: no cover
     print(pprinter(
         obj,
         oid_maps=oid_maps,
     print(pprinter(
         obj,
         oid_maps=oid_maps,

-        with_colours=True if environ.get("NO_COLOR") is None else False,
+        with_colours=environ.get("NO_COLOR") is None,

         with_decode_path=args.print_decode_path,
         decode_path_only=(
             () if args.decode_path_only is None else
         with_decode_path=args.print_decode_path,
         decode_path_only=(
             () if args.decode_path_only is None else