code: def str_raw_len(self, str):
      length = len(str)
      if length > 0:
          length += 1
      return length
  
imports: from google.protobuf.descriptor import FieldDescriptor
  from utils.util import mace_check
  import sys
  import struct
  import tempfile
label_desc: Use image node_id 2 for calling the ProtoConverter obj's underlying member method code with example usage: obj.str_raw_len(str) and returns: length