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use sha2::{Digest, Sha512};
use std::env;
use std::fs;
use std::io::{self, Read};
const BUFFER_SIZE: usize = 1024;
/// Print digest result as hex string and name pair
fn print_result(sum: &[u8], name: &str) {
for byte in sum {
print!("{:02x}", byte);
}
println!("\t{}", name);
}
/// Compute digest value for given `Reader` and print it
/// On any error simply return without doing anything
fn process<D: Digest + Default, R: Read>(reader: &mut R, name: &str) {
let mut sh = D::default();
let mut buffer = [0u8; BUFFER_SIZE];
loop {
let n = match reader.read(&mut buffer) {
Ok(n) => n,
Err(_) => return,
};
sh.update(&buffer[..n]);
if n == 0 || n < BUFFER_SIZE {
break;
}
}
print_result(&sh.finalize(), name);
}
fn main() {
let args = env::args();
// Process files listed in command line arguments one by one
// If no files provided process input from stdin
if args.len() > 1 {
for path in args.skip(1) {
if let Ok(mut file) = fs::File::open(&path) {
process::<Sha512, _>(&mut file, &path);
}
}
} else {
process::<Sha512, _>(&mut io::stdin(), "-");
}
}
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