code: def encode(rawbytes):
      """encode raw bytes into Z85"""
      # Accepts only byte arrays bounded to 4 bytes
      if len(rawbytes) % 4:
          raise ValueError(
              "length must be multiple of 4, not %i" % len(rawbytes)
          )
  
      nvalues = len(rawbytes) / 4
  
      values = struct.unpack(">%dI" % nvalues, rawbytes)
      encoded = []
      for v in values:
          for offset in _85s:
              encoded.append(Z85CHARS[(v // offset) % 85])
  
      # In Python 3, encoded is a list of integers (obviously?!)
      if PY3:
          return bytes(encoded)
      else:
          return b"".join(encoded)
  
label_desc: Use image node_id 1 for calling a global function with example usage: encode(rawbytes) and returns: bytes, bytes