UniversalString type

class pyasn1.type.char.UniversalString(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection(), encoding='us-ascii')

Creates UniversalString type or object.

UniversalString objects are immutable and duck-type Python 2 unicode or Python 3 str. When used in octet-stream context, UniversalString type assumes “utf-32-be” encoding.

Parameters:
  • value (unicode, str, bytes or UniversalString object) – unicode object (Python 2) or string (Python 3), alternatively string (Python 2) or bytes (Python 3) representing octet-stream of serialized unicode string (note encoding parameter) or UniversalString class instance.
  • tagSet (TagSet) – Object representing non-default ASN.1 tag(s)
  • subtypeSpec (ConstraintsIntersection) – Object representing non-default ASN.1 subtype constraint(s)
  • encoding (str) – Unicode codec ID to encode/decode unicode (Python 2) or str (Python 3) the payload when UniversalString object is used in octet-stream context.
Raises:

: :py:class:`pyasn1.error.PyAsn1Error` – On constraint violation or bad initializer.

Note

The UniversalString type models a Unicode (ISO10646-1) character string implicitly serialized into UTF-32 big endian.

clone(value=NoValue(), tagSet=TagSet(), subtypeSpec=ConstraintsIntersection(), encoding='us-ascii')

Creates a copy of a UniversalString type or object.

Any parameters to the clone() method will replace corresponding properties of the UniversalString object.

Parameters:
  • value (unicode, str, bytes or UniversalString object) – unicode object (Python 2) or string (Python 3), alternatively string (Python 2) or bytes (Python 3) representing octet-stream of serialized unicode string (note encoding parameter) or UniversalString class instance.
  • tagSet (TagSet) – Object representing non-default ASN.1 tag(s)
  • subtypeSpec (ConstraintsIntersection) – Object representing non-default ASN.1 subtype constraint(s)
  • encoding (str) – Unicode codec ID to encode/decode unicode (Python 2) or str (Python 3) the payload when UniversalString object is used in octet-stream context.
Returns:

new instance of UniversalString type/value

subtype(value=NoValue(), implicitTag=Tag(), explicitTag=Tag(), subtypeSpec=ConstraintsIntersection(), encoding='us-ascii')

Creates a copy of a UniversalString type or object.

Any parameters to the subtype() method will be added to the corresponding properties of the UniversalString object.

Parameters:
  • value (unicode, str, bytes or UniversalString object) – unicode object (Python 2) or string (Python 3), alternatively string (Python 2) or bytes (Python 3) representing octet-stream of serialized unicode string (note encoding parameter) or UniversalString class instance.
  • implicitTag (Tag) – Implicitly apply given ASN.1 tag object to caller’s TagSet, then use the result as new object’s ASN.1 tag(s).
  • explicitTag (Tag) – Explicitly apply given ASN.1 tag object to caller’s TagSet, then use the result as new object’s ASN.1 tag(s).
  • subtypeSpec (ConstraintsIntersection) – Object representing non-default ASN.1 subtype constraint(s)
  • encoding (str) – Unicode codec ID to encode/decode unicode (Python 2) or str (Python 3) the payload when UniversalString object is used in octet-stream context.
Returns:

new instance of UniversalString type/value

tagSet = TagSet((), Tag(tagClass=0, tagFormat=0, tagId=28))

Set (on class, not on instance) or return a TagSet object representing ASN.1 tag(s) associated with UniversalString type.

effectiveTagSet

For UniversalString type is equivalent to tagSet

isSameTypeWith(other, matchTags=True, matchConstraints=True)

Examine UniversalString type for equality with other ASN.1 type.

ASN.1 tags (tag) and constraints (constraint) are examined when carrying out ASN.1 types comparison.

No Python inheritance relationship between PyASN1 objects is considered.

Parameters:other (a pyasn1 type object) – Class instance representing ASN.1 type.
Returns:boolTrue if other is UniversalString type, False otherwise.
isSuperTypeOf(other, matchTags=True, matchConstraints=True)

Examine UniversalString type for subtype relationship with other ASN.1 type.

ASN.1 tags (tag) and constraints (constraint) are examined when carrying out ASN.1 types comparison.

No Python inheritance relationship between PyASN1 objects is considered.

Parameters:other (a pyasn1 type object) – Class instance representing ASN.1 type.
Returns:boolTrue if other is a subtype of UniversalString type, False otherwise.
isValue

Indicate if UniversalString object represents ASN.1 type or ASN.1 value.

In other words, if isValue is True, then the ASN.1 object is initialized.

Returns:boolTrue if object represents ASN.1 value and type, False if object represents just ASN.1 type.

Note

There is an important distinction between PyASN1 type and value objects. The PyASN1 type objects can only participate in ASN.1 type operations (subtyping, comparison etc) and serve as a blueprint for serialization codecs to resolve ambiguous types.

The PyASN1 value objects can additionally participate in most of built-in Python operations.

tagMap

Return a TagMap object mapping ASN.1 tags to ASN.1 objects within callee object.