Function rsync::sig_file

pub fn sig_file<P: AsRef<Path>>(
    old_file: P, 
    signature_file: P, 
    block_len: usize, 
    strong_len: usize, 
    stats: Option<&mut rs_stats_t>
) -> Result<(), Error>

Generates a signature of the "old_file" input file and writes it to "signature_file".