Function extensionobject_from_binary

schemas/uaprotocol_auto_add.py:2–29

Convert binary-coded ExtensionObject to a Python object. Returns an object, or None if TypeId is zero

(data)

def extensionobject_from_binary(data):
    """
    Convert binary-coded ExtensionObject to a Python object.
    Returns an object, or None if TypeId is zero
    """
    TypeId = NodeId.from_binary(data)
    Encoding = ord(data.read(1))
    body = None
    if Encoding & (1 << 0):
        length = uabin.Primitives.Int32.unpack(data)
        if length < 1:
            body = Buffer(b"")
        else:
            body = data.copy(length)
            data.skip(length)
    if TypeId.Identifier == 0:
        return None
    elif TypeId.Identifier not in ExtensionClasses:
        e = ExtensionObject()
        e.TypeId = TypeId
        e.Encoding = Encoding
        if body is not None:
            e.Body = body.read(len(body))
        return e
    klass = ExtensionClasses[TypeId.Identifier]
    if body is None:
        raise UaError("parsing ExtensionObject {0} without data".format(klass.__name__))
    return klass.from_binary(body)


def extensionobject_to_binary(obj):