switch {
	case *stdin:
		// Parse 'mc support inspect --json' output
		input := struct {
			File string `json:"file"`
			Key  string `json:"key"`
		}{}
		got, err := io.ReadAll(os.Stdin)
		if err != nil {
			fatalErr(err)
		}
		fatalErr(json.Unmarshal(got, &input))
		inputFileName = input.File
		*keyHex = input.Key
	case len(flag.Args()) == 1:
		inputFileName = flag.Args()[0]
	default:
		flag.Usage()

			hh, _ := highwayhash.New([]byte(magicHighwayHash256Key))
			hh.Write(data)
			got := hh.Sum(nil)
			if bytes.Equal(want, got) {
				s += ", \"bitrot_valid\": true"
			} else {
				s += ", \"bitrot_valid\": false"
			}
			s += "}"
		}
		res = append(res, []byte(s)...)
	}
	res = append(res, '}')