code: def _DecodeUnknownField(buffer, pos, wire_type):
      """Decode a unknown field.  Returns the UnknownField and new position."""
  
      if wire_type == wire_format.WIRETYPE_VARINT:
          (data, pos) = _DecodeVarint(buffer, pos)
      elif wire_type == wire_format.WIRETYPE_FIXED64:
          (data, pos) = _DecodeFixed64(buffer, pos)
      elif wire_type == wire_format.WIRETYPE_FIXED32:
          (data, pos) = _DecodeFixed32(buffer, pos)
      elif wire_type == wire_format.WIRETYPE_LENGTH_DELIMITED:
          (size, pos) = _DecodeVarint(buffer, pos)
          data = buffer[pos : pos + size].tobytes()
          pos += size
      elif wire_type == wire_format.WIRETYPE_START_GROUP:
          (data, pos) = _DecodeUnknownFieldSet(buffer, pos)
      elif wire_type == wire_format.WIRETYPE_END_GROUP:
          return (0, -1)
      else:
          raise _DecodeError("Wrong wire type in tag.")
  
      return (data, pos)
  
imports: import math
  import struct
  from google.protobuf.internal import containers
  from google.protobuf.internal import encoder
  from google.protobuf.internal import wire_format
  from google.protobuf import message
label_desc: Use image node_id 22 for calling a global function with example usage: _DecodeUnknownField(buffer, pos, wire_type) and returns: data,  pos, int,  unknown