code: def get_download_pipeline(in_fd, out_fd, gpg=False, lzop=True):
      
      commands = []
      if gpg:
          commands.append(GPGDecryptionFilter())
      if lzop:
          commands.append(LZODecompressionFilter())
      return Pipeline(commands, in_fd, out_fd)
docs: Create a pipeline to process a file after downloading.
          (Optionally decrypt, then decompress)