diig_run_04.go

func (e *Encryptor) Run(
    srcType, dstType, x, y, z, i, j string,
) error {
    var src []byte
    switch srcType {
    case "file":
        src = e.readFromFile(x, y, z)
    case "database":
        src = e.readFromDatabase(i, j)
    }

    // encrypt
    ...
}