ishan/sha256
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minor improvements

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This commit is contained in:
Ishan Jain 2023-11-20 12:29:21 +05:30
parent 96f881d5ca
commit be908e52dc
Signed by: ishan
GPG Key ID: 0506DB2A1CC75C27
1 changed files with 10 additions and 9 deletions
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19
src/main.rs
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@ -1,4 +1,5 @@
use std::{ use std::{
fmt::Write,
fs::File, fs::File,
io::{self, Read}, io::{self, Read},
}; };
@ -26,13 +27,13 @@ fn main() -> Result<(), std::io::Error> {
let mut stdin = stdin.lock(); let mut stdin = stdin.lock();
let hash = compute(&mut stdin)?; let hash = compute(&mut stdin)?;
print(hash); println!("{}", format(hash));
} else { } else {
for file in files { for file in files {
let mut f = match File::open(file.clone()) { let mut f = match File::open(file.clone()) {
Ok(v) => v, Ok(v) => v,
Err(e) => { Err(e) => {
println!("error in opening file: {}", e); eprintln!("error in opening file: {}", e);
continue; continue;
} }
}; };
@ -40,13 +41,12 @@ fn main() -> Result<(), std::io::Error> {
let hash = match compute(&mut f) { let hash = match compute(&mut f) {
Ok(hash) => hash, Ok(hash) => hash,
Err(e) => { Err(e) => {
println!("error in computing hash of {}: {}", file, e); eprintln!("error in computing hash of {}: {}", file, e);
continue; continue;
} }
}; };
print!("{}: ", file); println!("{}: {}", file, format(hash));
print(hash);
} }
} }
@ -67,15 +67,16 @@ fn compute<R: Read>(r: &mut R) -> Result<[u32; 8], std::io::Error> {
Ok(s256.sum()) Ok(s256.sum())
} }
fn print(hash: [u32; 8]) { fn format(hash: [u32; 8]) -> String {
let mut out = String::with_capacity(32 * 8);
for c in hash { for c in hash {
for b in c.to_be_bytes() { for b in c.to_be_bytes() {
print!("{:02x?}", b); write!(out, "{:02x}", b).expect("error in converting hash u32 -> hex");
} }
// print!(" ")
} }
println!(); out
} }
struct Sha256 { struct Sha256 {