extern crate cyfs_sha2; use cyfs_sha2::{Sha256, Digest}; 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.input(&buffer[..n]); if n == 0 || n < BUFFER_SIZE { break; } } print_result(&sh.result(), 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::<Sha256, _>(&mut file, &path); } } } else { process::<Sha256, _>(&mut io::stdin(), "-"); } }