code: def crc_finalize(crc):
      """Finalize CRC-32C checksum.
      This function should be called as last step of crc calculation.
      Args:
        crc: 32-bit checksum as long.
      Returns:
        finalized 32-bit checksum as long
      """
      return crc & _MASK
  
imports: import array
label_desc: Use image node_id 4 for calling a global function with example usage: crc_finalize(crc) and returns: unknown