add more compact output to bytediff

Cargo.lock

@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "aho-corasick"
@@ -13,15 +13,16 @@ dependencies = [
 
 [[package]]
 name = "anstream"
-version = "0.5.0"
+version = "0.6.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1f58811cfac344940f1a400b6e6231ce35171f614f26439e80f8c1465c5cc0c"
+checksum = "8acc5369981196006228e28809f761875c0327210a891e941f4c683b3a99529b"
 dependencies = [
  "anstyle",
  "anstyle-parse",
  "anstyle-query",
  "anstyle-wincon",
  "colorchoice",
+ "is_terminal_polyfill",
  "utf8parse",
 ]
 
@@ -46,17 +47,18 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5ca11d4be1bab0c8bc8734a9aa7bf4ee8316d462a08c6ac5052f888fef5b494b"
 dependencies = [
- "windows-sys",
+ "windows-sys 0.48.0",
 ]
 
 [[package]]
 name = "anstyle-wincon"
-version = "2.1.0"
+version = "3.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "58f54d10c6dfa51283a066ceab3ec1ab78d13fae00aa49243a45e4571fb79dfd"
+checksum = "ca3534e77181a9cc07539ad51f2141fe32f6c3ffd4df76db8ad92346b003ae4e"
 dependencies = [
  "anstyle",
- "windows-sys",
+ "once_cell",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
@@ -67,9 +69,9 @@ checksum = "5ad32ce52e4161730f7098c077cd2ed6229b5804ccf99e5366be1ab72a98b4e1"
 
 [[package]]
 name = "clap"
-version = "4.4.2"
+version = "4.4.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a13b88d2c62ff462f88e4a121f17a82c1af05693a2f192b5c38d14de73c19f6"
+checksum = "1e578d6ec4194633722ccf9544794b71b1385c3c027efe0c55db226fc880865c"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -77,9 +79,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.4.2"
+version = "4.4.18"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2bb9faaa7c2ef94b2743a21f5a29e6f0010dff4caa69ac8e9d6cf8b6fa74da08"
+checksum = "4df4df40ec50c46000231c914968278b1eb05098cf8f1b3a518a95030e71d1c7"
 dependencies = [
  "anstream",
  "anstyle",
@@ -89,9 +91,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.4.2"
+version = "4.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0862016ff20d69b84ef8247369fabf5c008a7417002411897d40ee1f4532b873"
+checksum = "cf9804afaaf59a91e75b022a30fb7229a7901f60c755489cc61c9b423b836442"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -101,9 +103,9 @@ dependencies = [
 
 [[package]]
 name = "clap_lex"
-version = "0.5.1"
+version = "0.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cd7cc57abe963c6d3b9d8be5b06ba7c8957a930305ca90304f24ef040aa6f961"
+checksum = "702fc72eb24e5a1e48ce58027a675bc24edd52096d5397d4aea7c6dd9eca0bd1"
 
 [[package]]
 name = "colorchoice"
@@ -128,6 +130,12 @@ version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "95505c38b4572b2d910cecb0281560f54b440a19336cbbcb27bf6ce6adc6f5a8"
 
+[[package]]
+name = "is_terminal_polyfill"
+version = "1.70.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
+
 [[package]]
 name = "lazy_static"
 version = "1.4.0"
@@ -140,6 +148,12 @@ version = "2.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
 
+[[package]]
+name = "once_cell"
+version = "1.20.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "945462a4b81e43c4e3ba96bd7b49d834c6f61198356aa858733bc4acf3cbe62e"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.66"
@@ -242,7 +256,16 @@ version = "0.48.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
 dependencies = [
- "windows-targets",
+ "windows-targets 0.48.5",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -251,13 +274,29 @@ version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9a2fa6e2155d7247be68c096456083145c183cbbbc2764150dda45a87197940c"
 dependencies = [
- "windows_aarch64_gnullvm",
- "windows_aarch64_msvc",
- "windows_i686_gnu",
- "windows_i686_msvc",
- "windows_x86_64_gnu",
- "windows_x86_64_gnullvm",
- "windows_x86_64_msvc",
+ "windows_aarch64_gnullvm 0.48.5",
+ "windows_aarch64_msvc 0.48.5",
+ "windows_i686_gnu 0.48.5",
+ "windows_i686_msvc 0.48.5",
+ "windows_x86_64_gnu 0.48.5",
+ "windows_x86_64_gnullvm 0.48.5",
+ "windows_x86_64_msvc 0.48.5",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm 0.52.6",
+ "windows_aarch64_msvc 0.52.6",
+ "windows_i686_gnu 0.52.6",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc 0.52.6",
+ "windows_x86_64_gnu 0.52.6",
+ "windows_x86_64_gnullvm 0.52.6",
+ "windows_x86_64_msvc 0.52.6",
 ]
 
 [[package]]
@@ -266,38 +305,86 @@ version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2b38e32f0abccf9987a4e3079dfb67dcd799fb61361e53e2882c3cbaf0d905d8"
 
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
 [[package]]
 name = "windows_aarch64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dc35310971f3b2dbbf3f0690a219f40e2d9afcf64f9ab7cc1be722937c26b4bc"
 
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
 [[package]]
 name = "windows_i686_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a75915e7def60c94dcef72200b9a8e58e5091744960da64ec734a6c6e9b3743e"
 
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
 [[package]]
 name = "windows_i686_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8f55c233f70c4b27f66c523580f78f1004e8b5a8b659e05a4eb49d4166cca406"
 
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
 [[package]]
 name = "windows_x86_64_gnu"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "53d40abd2583d23e4718fddf1ebec84dbff8381c07cae67ff7768bbf19c6718e"
 
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
 [[package]]
 name = "windows_x86_64_gnullvm"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
 
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
 [[package]]
 name = "windows_x86_64_msvc"
 version = "0.48.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1709675310,
-        "narHash": "sha256-w61tqFEmuJ+/1rAwU7nkYZ+dN6sLwyobfLwX2Yn42FE=",
+        "lastModified": 1740396192,
+        "narHash": "sha256-ATMHHrg3sG1KgpQA5x8I+zcYpp5Sf17FaFj/fN+8OoQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "43d259f8d726113fac056e8bb17d5ac2dea3e0a8",
+        "rev": "d9b69c3ec2a2e2e971c534065bdd53374bd68b97",
         "type": "github"
       },
       "original": {
@@ -42,11 +42,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1709126324,
-        "narHash": "sha256-q6EQdSeUZOG26WelxqkmR7kArjgWCdw5sfJVHPH/7j8=",
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "d465f4819400de7c8d874d50b982301f28a84605",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
         "type": "github"
       },
       "original": {

src/bin/bytediff.rs

@@ -1,7 +1,53 @@
 use std::fs::File;
 use std::io::{prelude::*, BufReader};
+use std::path::PathBuf;
 
-use anyhow::{anyhow, Context, Result};
+use anyhow::{Context, Result};
+use clap::Parser;
+
+#[derive(Parser, Debug)]
+#[clap(author, version)]
+/// diff binary files
+///
+/// bytediff checks whether binary files match, and prints out
+/// a list of differences at the byte level if they don't.
+struct Cli {
+    /// Print out a full hexdump of differing bytes, not just a summary of differences
+    #[arg(short, long)]
+    detailed: bool,
+
+    /// First file to diff
+    #[arg(required = true)]
+    file1: PathBuf,
+
+    /// Second file to diff
+    #[arg(required = true)]
+    file2: PathBuf,
+}
+
+#[derive(PartialEq, Eq)]
+enum DiffState {
+    Same,
+    DifferNonZero,
+    DifferAZero,
+    DifferBZero,
+}
+
+fn is_byte_vec_zero(v: &[u8]) -> bool {
+    v.iter().all(|c| *c == 0u8)
+}
+
+fn compare_byte_vecs(a: &[u8], b: &[u8]) -> DiffState {
+    if a == b {
+        DiffState::Same
+    } else if is_byte_vec_zero(a) {
+        DiffState::DifferAZero
+    } else if is_byte_vec_zero(b) {
+        DiffState::DifferBZero
+    } else {
+        DiffState::DifferNonZero
+    }
+}
 
 struct ZipLonger<A: Iterator, B: Iterator> {
     a: A,
@@ -83,53 +129,89 @@ fn color_byte_display(this: &[u8], that: &[u8], color: u8) -> String {
 }
 
 fn main() -> Result<()> {
-    let mut args = std::env::args();
-    let name = args
-        .next()
-        .ok_or_else(|| anyhow!("Missing executable name in args"))?;
-    let (a, b) = match (args.next(), args.next()) {
-        (Some(a), Some(b)) => (a, b),
-        _ => return Err(anyhow!("Usage: {} file file", name)),
-    };
+    let cli = Cli::parse();
+
+    let a = cli.file1;
+    let b = cli.file2;
 
     let a_bytes = BufReader::new(
-        File::open(a.clone()).with_context(|| format!("Failed to open input file {}", a))?,
+        File::open(a.clone())
+            .with_context(|| format!("Failed to open input file {}", a.display()))?,
     )
     .bytes();
     let b_bytes = BufReader::new(
-        File::open(b.clone()).with_context(|| format!("Failed to open input file {}", b))?,
+        File::open(b.clone())
+            .with_context(|| format!("Failed to open input file {}", b.display()))?,
     )
     .bytes();
 
-    let mut in_differing_region = false;
+    let mut diff_state = DiffState::Same;
+    let mut region_start: usize = 0;
 
     for (i, (rva, rvb)) in
         ZipLonger::new(Chunks::new(a_bytes, 16), Chunks::new(b_bytes, 16)).enumerate()
     {
         let va: Vec<u8> = rva
             .transpose()
-            .with_context(|| format!("Error reading from input file {}", a))?
+            .with_context(|| format!("Error reading from input file {}", a.display()))?
             .unwrap_or_default();
         let vb: Vec<u8> = rvb
             .transpose()
-            .with_context(|| format!("Error reading from input file {}", b))?
+            .with_context(|| format!("Error reading from input file {}", b.display()))?
             .unwrap_or_default();
 
-        if va == vb {
-            if in_differing_region {
-                in_differing_region = false;
-                println!("---");
-            }
-            continue;
-        }
-        in_differing_region = true;
+        let new_diff_state = compare_byte_vecs(&va, &vb);
 
-        println!(
-            "{0:08x}: {1}\n{0:08x}: {2}",
-            i * 16,
-            color_byte_display(&va, &vb, 31),
-            color_byte_display(&vb, &va, 32),
-        );
+        if cli.detailed {
+            if new_diff_state == DiffState::Same {
+                if diff_state != DiffState::Same {
+                    println!("---");
+                }
+            } else {
+                println!(
+                    "{0:08x}: {1}\n{0:08x}: {2}",
+                    i * 16,
+                    color_byte_display(&va, &vb, 31),
+                    color_byte_display(&vb, &va, 32),
+                );
+            }
+        } else {
+            if new_diff_state != diff_state {
+                if diff_state != DiffState::Same {
+                    print!("{0:08x} to {1:08x}: ", region_start, i * 16);
+                }
+                match diff_state {
+                    DiffState::Same => (),
+                    DiffState::DifferAZero => {
+                        println!("First file is zero bytes");
+                    }
+                    DiffState::DifferBZero => {
+                        println!("Second file is zero bytes");
+                    }
+                    DiffState::DifferNonZero => {
+                        println!("Files differ");
+                    }
+                }
+                region_start = i * 16;
+            }
+        }
+        diff_state = new_diff_state;
+    }
+
+    match diff_state {
+        DiffState::Same => (),
+        DiffState::DifferAZero => {
+            println!("First file is zero bytes from {0:08x} to end", region_start);
+        }
+        DiffState::DifferBZero => {
+            println!(
+                "Second file is zero bytes from {0:08x} to end",
+                region_start
+            );
+        }
+        DiffState::DifferNonZero => {
+            println!("Files differ from {0:08x} to end", region_start);
+        }
     }
 
     Ok(())