clean up code, implement all secure sha algorithms

.rustfmt.toml

@@ -0,0 +1,4 @@
+edition = "2021"
+tab_spaces = 2
+match_block_trailing_comma = true
+#wrap_comments = true

src/hashers.rs

@@ -0,0 +1,24 @@
+use sha2::{Digest, Sha256, Sha384, Sha512};
+use std::fs::File;
+use std::io;
+
+pub fn hash_sha256(mut file: File) -> String {
+  let mut hasher = Sha256::new();
+  _ = io::copy(&mut file, &mut hasher);
+
+  return format!("{:x}", hasher.finalize());
+}
+
+pub fn hash_sha384(mut file: File) -> String {
+  let mut hasher = Sha384::new();
+  _ = io::copy(&mut file, &mut hasher);
+
+  return format!("{:x}", hasher.finalize());
+}
+
+pub fn hash_sha512(mut file: File) -> String {
+  let mut hasher = Sha512::new();
+  _ = io::copy(&mut file, &mut hasher);
+
+  return format!("{:x}", hasher.finalize());
+}

src/main.rs

@@ -1,44 +1,114 @@
-use sha2::{Sha256, Digest};
-use std::ops::Deref;
-use std::path::PathBuf;
-use std::thread;
-use std::thread::available_parallelism;
-use std::fs::File;
-use std::io;
 use clap::Parser;
-use std::sync::Arc;
-use std::sync::Mutex;
 use std::collections::VecDeque;
-use std::fs;
+use std::fs::{self, File};
+use std::path::PathBuf;
+use std::sync::{Arc, Mutex};
+use std::thread::{self, available_parallelism};
+
+mod hashers;
 
 #[derive(Parser)]
 #[command(name = "psha")]
 #[command(version = option_env!("CARGO_PKG_VERSION"))]
+#[command(about = "A parallel checksum tool for various algorithms")]
 #[command(long_about = None)]
 struct Args {
   #[arg(
-    trailing_var_arg = true,
+    short,
+    long,
+    help = "Use at most this number of threads, 0 means as many as there are processor cores",
+    default_value = "0"
   )]
+  threads: usize,
+
+  #[arg(
+    short,
+    long,
+    help = "Enable debug output (thread info, algorithm used/detected)"
+  )]
+  debug: bool,
+
+  #[arg(
+    short,
+    long,
+    help = "Specify an algorithm for hashing",
+    default_value = "sha256",
+    value_parser = clap::builder::PossibleValuesParser::new(["sha256", "sha512"])
+  )]
+  algorithm: String,
+
+  #[arg(
+    short = 'f',
+    long,
+    help = "Show canonicalized (relative paths converted to absolute) file paths"
+  )]
+  canonicalize: bool,
+
+  #[arg(
+    short = 'c',
+    long,
+    help = "Read checksums from the file(s) and verify them"
+  )]
+  check: Vec<PathBuf>,
+
+  #[arg(
+    short = 'q',
+    long,
+    help = "(only used with -c) Only print checksums that fail; do not print OK for files that are successful"
+  )]
+  failures_only: bool,
+
+  #[arg(
+    short = 'Q',
+    long,
+    help = "(only used with -c) Suppress all output to stdout, including failures"
+  )]
+  quiet: bool,
+
+  #[arg(trailing_var_arg = true)]
   files: Vec<PathBuf>,
 }
 
-fn checksum(thread_id: usize, filenames: Arc<Mutex<VecDeque<PathBuf>>>) -> Result<(), String> {
-  let running = true;
-  while running {
-    let filename = match filenames.lock().unwrap().pop_front() {
-      Some(f) => f,
-      None => return Ok(())
-    };
-    let mut hasher = Sha256::new();
-    let mut file = File::open(&filename).unwrap();
+struct ThreadInfo {
+  debug: Arc<bool>,
+  failures_only: Arc<bool>,
+  quiet: Arc<bool>,
+  thread_id: usize,
+  filenames: Arc<Mutex<VecDeque<PathBuf>>>,
+  algorithm: Arc<String>,
+}
 
-    io::copy(&mut file, &mut hasher);
-    let hash = hasher.finalize();
-    // println!("thread {} result: {:x}\t{}", thread_id, hash, filename.as_path().display());
-    println!("{:x}\t{}", hash, filename.as_path().display());
+fn hash(info: ThreadInfo) -> Result<(), String> {
+  loop {
+    let filename = match info.filenames.lock().unwrap().pop_front() {
+      Some(f) => f,
+      None => break,
+    };
+
+    if !*info.quiet && *info.debug {
+      eprintln!(
+        "thread {} is hashing file '{}'",
+        info.thread_id,
+        filename.as_path().display()
+      );
+    }
+
+    let file = File::open(&filename).unwrap();
+    let res = match &*info.algorithm.as_str() {
+      "sha256" => hashers::hash_sha256(file),
+      "sha384" => hashers::hash_sha384(file),
+      "sha512" => hashers::hash_sha512(file),
+      _ => panic!("Somehow did not pass a supported algorithm"),
+    };
+
+    if !*info.quiet {
+      println!("{}  {}", res, filename.as_path().display());
+    }
   }
 
-  println!("thread {} has ran out of work", thread_id);
+  if !*info.quiet && *info.debug {
+    eprintln!("thread {} has ran out of work", info.thread_id);
+  }
 
   Ok(())
 }
@@ -49,33 +119,37 @@ fn main() {
   let mut buffer = VecDeque::new();
   let mut handles = vec![];
   for file in args.files {
-    // match fs::canonicalize(file.as_path()) {
-    //   Ok(p) => buffer.push_back(p),
-    //   Err(e) => panic!("unable to canonicalize {}: {}", file.as_path().display(), e)
-    // };
-    buffer.push_back(file);
+    if args.canonicalize {
+      match fs::canonicalize(file.as_path()) {
+        Ok(p) => buffer.push_back(p),
+        Err(e) => panic!("unable to canonicalize {}: {}", file.as_path().display(), e),
+      };
+    } else {
+      buffer.push_back(file);
+    }
   }
-  let arc_buf = Arc::new(Mutex::new(buffer));
-  // let mut handles = vec![];
-  // let chunks = Arc::new(Mutex::new(args.files.chunks(args.files.len()/ cpus).clone()));
-/*   let threads = chunks.into_iter().map(|chunk| {
-    thread::spawn(move || checksum(0, chunk.to_vec()))
-  }).collect::<Vec<_>>(); */
 
-/*   threads.into_iter().for_each(|i| { i.join().unwrap(); });
-  // for file in args.files {
-  //   if let Err(e) = checksum(0, file) { */
-  //     println!("{}", e);
-  //     break;
-  //   };
-  // }
+  let arc_buf = Arc::new(Mutex::new(buffer));
   for i in 0..cpus {
-    let safe = Arc::clone(&arc_buf);
-    handles.push(thread::spawn(move || checksum(i, safe)))
+    let safe_buf = Arc::clone(&arc_buf);
+    let safe_alg = Arc::new(args.algorithm.clone());
+    handles.push(thread::spawn(move || {
+      hash(ThreadInfo {
+        debug: Arc::new(args.debug),
+        failures_only: Arc::new(args.failures_only),
+        quiet: Arc::new(args.quiet),
+        thread_id: i,
+        filenames: safe_buf,
+        algorithm: safe_alg,
+      })
+    }))
   }
 
   for handle in handles {
-    handle.join().unwrap();
+    match handle.join().unwrap() {
+      Err(e) => panic!("{}", e),
+      Ok(_) => (),
+    }
   }
 
   // println!("{}", available_parallelism().unwrap().get());