Add links to Ubuntu / Debian packages

closes #77

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: sharkdp

.travis.yml

@@ -14,7 +14,7 @@ matrix:
       env: TARGET=x86_64-apple-darwin
     - os: windows
       rust: stable
-      env: TARGET=x86_64-pc-windows-msvc
+      env: TARGET=x86_64-pc-windows-gnu
 
     # Minimum Rust supported channel.
     - os: linux
@@ -43,7 +43,7 @@ install:
 script:
   # Incorporate TARGET env var to the build and test process
   - cargo build --target $TARGET --verbose
-  #- cargo test --target $TARGET --verbose
+  - cargo test --target $TARGET --verbose
 
 before_deploy:
   - bash ci/before_deploy.bash
@@ -72,7 +72,7 @@ deploy:
     # deploy only if we push a tag
     tags: true
     # deploy only on stable channel that has TARGET env variable sets
-    condition: $TRAVIS_RUST_VERSION = stable && $TARGET != "x86_64-pc-windows-msvc"
+    condition: $TRAVIS_RUST_VERSION = stable && $TARGET != "x86_64-pc-windows-gnu"
 
 notifications:
   email:

Cargo.lock

@@ -5,32 +5,30 @@ name = "ansi_term"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "atty"
-version = "0.2.11"
+version = "0.2.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "bitflags"
-version = "1.0.4"
+version = "1.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "cc"
-version = "1.0.35"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "cfg-if"
-version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -39,32 +37,30 @@ version = "2.33.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "term_size 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "ctrlc"
+name = "hermit-abi"
-version = "3.1.1"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "nix 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "hexyl"
-version = "0.5.0"
+version = "0.7.0"
 dependencies = [
- "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "ansi_term 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "ctrlc 3.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -78,34 +74,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.51"
+version = "0.2.67"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "nix"
-version = "0.11.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "redox_syscall"
-version = "0.1.54"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "redox_termios"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "strsim"
 version = "0.8.0"
@@ -117,32 +88,22 @@ version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "termion"
-version = "1.5.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "textwrap"
 version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "term_size 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "unicode-width"
-version = "0.1.5"
+version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -150,11 +111,6 @@ name = "vec_map"
 version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "void"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "winapi"
 version = "0.2.8"
@@ -162,7 +118,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "winapi"
-version = "0.3.7"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -186,26 +142,20 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [metadata]
 "checksum ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
-"checksum atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9a7d5b8723950951411ee34d271d99dddcc2035a16ab25310ea2c8cfd4369652"
+"checksum ansi_term 0.12.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
-"checksum bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "228047a76f468627ca71776ecdebd732a3423081fcf5125585bcd7c49886ce12"
+"checksum atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
-"checksum cc 1.0.35 (registry+https://github.com/rust-lang/crates.io-index)" = "5e5f3fee5eeb60324c2781f1e41286bdee933850fff9b3c672587fed5ec58c83"
+"checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
-"checksum cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "11d43355396e872eefb45ce6342e4374ed7bc2b3a502d1b28e36d6e23c05d1f4"
 "checksum clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5067f5bb2d80ef5d68b4c87db81601f0b75bca627bc2ef76b141d7b846a3c6d9"
-"checksum ctrlc 3.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "630391922b1b893692c6334369ff528dcc3a9d8061ccf4c803aa8f83cb13db5e"
+"checksum hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "1010591b26bbfe835e9faeabeb11866061cc7dcebffd56ad7d0942d0e61aefd8"
 "checksum kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7507624b29483431c0ba2d82aece8ca6cdba9382bff4ddd0f7490560c056098d"
-"checksum libc 0.2.51 (registry+https://github.com/rust-lang/crates.io-index)" = "bedcc7a809076656486ffe045abeeac163da1b558e963a31e29fbfbeba916917"
+"checksum libc 0.2.67 (registry+https://github.com/rust-lang/crates.io-index)" = "eb147597cdf94ed43ab7a9038716637d2d1bf2bc571da995d0028dec06bd3018"
-"checksum nix 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d37e713a259ff641624b6cb20e3b12b2952313ba36b6823c0f16e6cfd9e5de17"
-"checksum redox_syscall 0.1.54 (registry+https://github.com/rust-lang/crates.io-index)" = "12229c14a0f65c4f1cb046a3b52047cdd9da1f4b30f8a39c5063c8bae515e252"
-"checksum redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "7e891cfe48e9100a70a3b6eb652fef28920c117d366339687bd5576160db0f76"
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum term_size 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9e5b9a66db815dcfd2da92db471106457082577c3c278d4138ab3e3b4e189327"
-"checksum termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "689a3bdfaab439fd92bc87df5c4c78417d3cbe537487274e9b0b2dce76e92096"
 "checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
-"checksum unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "882386231c45df4700b275c7ff55b6f3698780a650026380e72dabe76fa46526"
+"checksum unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479"
 "checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
-"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
-"checksum winapi 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "f10e386af2b13e47c89e7236a7a14a086791a2b88ebad6df9bf42040195cf770"
+"checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"

Cargo.toml

@@ -7,14 +7,17 @@ license = "MIT/Apache-2.0"
 name = "hexyl"
 readme = "README.md"
 repository = "https://github.com/sharkdp/hexyl"
-version = "0.5.0"
+version = "0.7.0"
 edition = "2018"
 
 [dependencies]
-ansi_term = "0.11"
+ansi_term = "0.12"
 atty = "0.2"
-ctrlc = "3.1"
 
 [dependencies.clap]
 version = "2"
 features = ["suggestions", "color", "wrap_help"]
+
+[profile.release]
+lto = true
+codegen-units = 1

README.md

@@ -19,13 +19,31 @@ of bytes (NULL bytes, printable ASCII characters, ASCII whitespace characters, o
 
 ## Installation
 
-### On Debian-based systems
+### On Ubuntu
+
+*... and other Debian-based Linux distributions.*
+
+If you run Ubuntu 19.10 (Eoan Ermine) or newer, you can install the [officially maintained package](https://packages.ubuntu.com/eoan/hexyl):
+```bash
+sudo apt install hexyl
+```
+If you use an older version of Ubuntu, you can download
+the latest `.deb` package from the release page and install it via:
 
 ``` bash
-wget "https://github.com/sharkdp/hexyl/releases/download/v0.5.0/hexyl_0.5.0_amd64.deb"
+sudo dpkg -i hexyl_0.7.0_amd64.deb  # adapt version number and architecture
-sudo dpkg -i hexyl_0.5.0_amd64.deb
 ```
 
+### On Debian
+
+If you run Debian Buster or newer, you can install the [officially maintained Debian package](https://packages.debian.org/buster/hexyl):
+```bash
+sudo apt-get install hexyl
+```
+
+If you run an older version of Debian, see above for instructions on how to
+manually install `hexyl`.
+
 ### On Arch Linux
 
 You can install `hexyl` from [the official package repository](https://www.archlinux.org/packages/community/x86_64/hexyl/):
@@ -58,8 +76,9 @@ Check out the [release page](https://github.com/sharkdp/hexyl/releases) for bina
 
 ### On Windows
 
-For now, you will have to install from source via `cargo` (see below). Make sure that
+For now, you will have to install from source via `cargo` (see below). Make sure that you
-you use a terminal that supports ANSI escape sequences (like PowerShell on Windows 10).
+use a terminal that supports ANSI escape sequences (like ConHost v2 since Windows 10 1703
+or Windows Terminal since Windows 10 1903).
 
 ### Via cargo
 

examples/simple.rs

@@ -0,0 +1,20 @@
+use std::io;
+
+use hexyl::{BorderStyle, Printer};
+
+fn main() {
+    let input = vec![
+        0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44,
+        0x52, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x44, 0x08, 0x02, 0x00, 0x00, 0x00,
+    ];
+
+    let stdout = io::stdout();
+    let mut handle = stdout.lock();
+
+    let show_color = true;
+    let use_squeezing = false;
+    let border_style = BorderStyle::Unicode;
+
+    let mut printer = Printer::new(&mut handle, show_color, border_style, use_squeezing);
+    printer.print_all(&input[..]).unwrap();
+}

src/bin/hexyl.rs

@@ -0,0 +1,154 @@
+#[macro_use]
+extern crate clap;
+
+use atty;
+
+use std::fs::File;
+use std::io::{self, prelude::*};
+
+use clap::{App, AppSettings, Arg};
+
+use atty::Stream;
+
+use hexyl::{BorderStyle, Printer};
+
+fn run() -> Result<(), Box<dyn std::error::Error>> {
+    let app = App::new(crate_name!())
+        .setting(AppSettings::ColorAuto)
+        .setting(AppSettings::ColoredHelp)
+        .setting(AppSettings::DeriveDisplayOrder)
+        .setting(AppSettings::UnifiedHelpMessage)
+        .version(crate_version!())
+        .about(crate_description!())
+        .arg(Arg::with_name("file").help("File to display"))
+        .arg(
+            Arg::with_name("length")
+                .short("n")
+                .long("length")
+                .takes_value(true)
+                .value_name("N")
+                .help("Read only N bytes from the input"),
+        )
+        .arg(
+            Arg::with_name("bytes")
+                .short("c")
+                .long("bytes")
+                .takes_value(true)
+                .value_name("N")
+                .help("An alias for -n/--length"),
+        )
+        .arg(
+            Arg::with_name("nosqueezing")
+                .short("v")
+                .long("no-squeezing")
+                .help(
+                    "Displays all input data. Otherwise any number of groups of output \
+                     lines which would be identical to the preceding group of lines, are \
+                     replaced with a line comprised of a single asterisk.",
+                ),
+        )
+        .arg(
+            Arg::with_name("color")
+                .long("color")
+                .takes_value(true)
+                .value_name("when")
+                .possible_values(&["always", "auto", "never"])
+                .default_value("always")
+                .help(
+                    "When to use colors. The auto-mode only displays colors if the output \
+                     goes to an interactive terminal",
+                ),
+        )
+        .arg(
+            Arg::with_name("border")
+                .long("border")
+                .takes_value(true)
+                .possible_values(&["unicode", "ascii", "none"])
+                .default_value("unicode")
+                .help("Whether to draw a border with unicode or ASCII characters, or none at all"),
+        )
+        .arg(
+            Arg::with_name("display_offset")
+                .short("o")
+                .long("display-offset")
+                .takes_value(true)
+                .value_name("OFFSET")
+                .help("Add OFFSET to the displayed file position."),
+        );
+
+    let matches = app.get_matches_safe()?;
+
+    let stdin = io::stdin();
+
+    let mut reader: Box<dyn Read> = match matches.value_of("file") {
+        Some(filename) => Box::new(File::open(filename)?),
+        None => Box::new(stdin.lock()),
+    };
+
+    let length_arg = matches.value_of("length").or(matches.value_of("bytes"));
+
+    if let Some(length) = length_arg.and_then(parse_hex_or_int) {
+        reader = Box::new(reader.take(length));
+    }
+
+    let show_color = match matches.value_of("color") {
+        Some("never") => false,
+        Some("auto") => atty::is(Stream::Stdout),
+        _ => true,
+    };
+
+    let border_style = match matches.value_of("border") {
+        Some("unicode") => BorderStyle::Unicode,
+        Some("ascii") => BorderStyle::Ascii,
+        _ => BorderStyle::None,
+    };
+
+    let squeeze = !matches.is_present("nosqueezing");
+
+    let display_offset = matches
+        .value_of("display_offset")
+        .and_then(parse_hex_or_int)
+        .unwrap_or(0);
+
+    let stdout = io::stdout();
+    let mut stdout_lock = stdout.lock();
+
+    let mut printer = Printer::new(&mut stdout_lock, show_color, border_style, squeeze);
+    printer.display_offset(display_offset as usize);
+    printer.print_all(&mut reader)?;
+
+    Ok(())
+}
+
+fn main() {
+    // Enable ANSI support for Windows
+    #[cfg(windows)]
+    let _ = ansi_term::enable_ansi_support();
+
+    let result = run();
+
+    if let Err(err) = result {
+        if let Some(clap_err) = err.downcast_ref::<clap::Error>() {
+            eprint!("{}", clap_err); // Clap errors already have newlines
+
+            match clap_err.kind {
+                // The exit code should not indicate an error for --help / --version
+                clap::ErrorKind::HelpDisplayed | clap::ErrorKind::VersionDisplayed => {
+                    std::process::exit(0)
+                }
+                _ => (),
+            }
+        } else {
+            eprintln!("Error: {}", err);
+        }
+        std::process::exit(1);
+    }
+}
+
+fn parse_hex_or_int(n: &str) -> Option<u64> {
+    if n.starts_with("0x") {
+        u64::from_str_radix(n.trim_start_matches("0x"), 16).ok()
+    } else {
+        n.parse::<u64>().ok()
+    }
+}

src/lib.rs

@@ -1,22 +1,10 @@
-#[macro_use]
+pub mod squeezer;
-extern crate clap;
 
-use atty;
+use std::io::{self, Read, Write};
-use ctrlc;
-
-mod squeezer;
-
-use std::fs::File;
-use std::io::{self, prelude::*, StdoutLock};
-use std::sync::atomic::{AtomicBool, Ordering};
-use std::sync::Arc;
-
-use clap::{App, AppSettings, Arg};
 
 use ansi_term::Color;
 use ansi_term::Color::Fixed;
 
-use atty::Stream;
 use crate::squeezer::{SqueezeAction, Squeezer};
 
 const BUFFER_SIZE: usize = 256;
@@ -28,7 +16,7 @@ const COLOR_ASCII_WHITESPACE: Color = Color::Green;
 const COLOR_ASCII_OTHER: Color = Color::Purple;
 const COLOR_NONASCII: Color = Color::Yellow;
 
-enum ByteCategory {
+pub enum ByteCategory {
     Null,
     AsciiPrintable,
     AsciiWhitespace,
@@ -90,7 +78,7 @@ struct BorderElements {
     right_corner: char,
 }
 
-enum BorderStyle {
+pub enum BorderStyle {
     Unicode,
     Ascii,
     None,
@@ -150,33 +138,34 @@ impl BorderStyle {
     }
 }
 
-struct Printer<'a> {
+pub struct Printer<'a, Writer: Write> {
     idx: usize,
     /// The raw bytes used as input for the current line.
     raw_line: Vec<u8>,
-    /// The buffered line built with each byte, ready to print to stdout.
+    /// The buffered line built with each byte, ready to print to writer.
     buffer_line: Vec<u8>,
-    stdout: StdoutLock<'a>,
+    writer: &'a mut Writer,
     show_color: bool,
     border_style: BorderStyle,
     header_was_printed: bool,
     byte_hex_table: Vec<String>,
     byte_char_table: Vec<String>,
     squeezer: Squeezer,
+    display_offset: usize,
 }
 
-impl<'a> Printer<'a> {
+impl<'a, Writer: Write> Printer<'a, Writer> {
-    fn new(
+    pub fn new(
-        stdout: StdoutLock<'_>,
+        writer: &'a mut Writer,
         show_color: bool,
         border_style: BorderStyle,
         use_squeeze: bool,
-    ) -> Printer<'_> {
+    ) -> Printer<'a, Writer> {
         Printer {
             idx: 1,
             raw_line: vec![],
             buffer_line: vec![],
-            stdout,
+            writer,
             show_color,
             border_style,
             header_was_printed: false,
@@ -201,17 +190,23 @@ impl<'a> Printer<'a> {
                 })
                 .collect(),
             squeezer: Squeezer::new(use_squeeze),
+            display_offset: 0,
         }
     }
 
-    fn header(&mut self) {
+    pub fn display_offset(&mut self, display_offset: usize) -> &mut Self {
+        self.display_offset = display_offset;
+        self
+    }
+
+    pub fn header(&mut self) {
         if let Some(border_elements) = self.border_style.header_elems() {
             let h = border_elements.horizontal_line;
             let h8 = h.to_string().repeat(8);
             let h25 = h.to_string().repeat(25);
 
             writeln!(
-                self.stdout,
+                self.writer,
                 "{l}{h8}{c}{h25}{c}{h25}{c}{h8}{c}{h8}{r}",
                 l = border_elements.left_corner,
                 c = border_elements.column_separator,
@@ -223,14 +218,14 @@ impl<'a> Printer<'a> {
         }
     }
 
-    fn footer(&mut self) {
+    pub fn footer(&mut self) {
         if let Some(border_elements) = self.border_style.footer_elems() {
             let h = border_elements.horizontal_line;
             let h8 = h.to_string().repeat(8);
             let h25 = h.to_string().repeat(25);
 
             writeln!(
-                self.stdout,
+                self.writer,
                 "{l}{h8}{c}{h25}{c}{h25}{c}{h8}{c}{h8}{r}",
                 l = border_elements.left_corner,
                 c = border_elements.column_separator,
@@ -249,7 +244,7 @@ impl<'a> Printer<'a> {
         }
 
         let style = COLOR_OFFSET.normal();
-        let byte_index = format!("{:08x}", self.idx - 1);
+        let byte_index = format!("{:08x}", (self.idx - 1) + self.display_offset);
         let formatted_string = if self.show_color {
             format!("{}", style.paint(byte_index))
         } else {
@@ -264,7 +259,7 @@ impl<'a> Printer<'a> {
         );
     }
 
-    fn print_byte(&mut self, b: u8) -> io::Result<()> {
+    pub fn print_byte(&mut self, b: u8) -> io::Result<()> {
         if self.idx % 16 == 1 {
             self.print_position_indicator();
         }
@@ -289,7 +284,7 @@ impl<'a> Printer<'a> {
         Ok(())
     }
 
-    fn print_textline(&mut self) -> io::Result<()> {
+    pub fn print_textline(&mut self) -> io::Result<()> {
         let len = self.raw_line.len();
 
         if len == 0 {
@@ -305,74 +300,83 @@ impl<'a> Printer<'a> {
                     self.border_style.inner_sep(),
                     self.border_style.outer_sep(),
                 );
-                self.stdout.write_all(&self.buffer_line)?;
+                self.writer.write_all(&self.buffer_line)?;
             }
             return Ok(());
         }
 
-        if len < 8 {
+        let squeeze_action = self.squeezer.action();
-            let _ = write!(
-                &mut self.buffer_line,
-                "{0:1$}{3}{0:2$}{4}",
-                "",
-                3 * (8 - len),
-                1 + 3 * 8,
-                self.border_style.inner_sep(),
-                self.border_style.outer_sep(),
-            );
-        } else {
-            let _ = write!(
-                &mut self.buffer_line,
-                "{0:1$}{2}",
-                "",
-                3 * (16 - len),
-                self.border_style.outer_sep()
-            );
-        }
 
-        let mut idx = 1;
+        if squeeze_action != SqueezeAction::Delete {
-        for &b in self.raw_line.iter() {
+            if len < 8 {
-            let _ = write!(
+                let _ = write!(
-                &mut self.buffer_line,
+                    &mut self.buffer_line,
-                "{}",
+                    "{0:1$}{3}{0:2$}{4}",
-                self.byte_char_table[b as usize]
+                    "",
-            );
+                    3 * (8 - len),
-
+                    1 + 3 * 8,
-            if idx == 8 {
+                    self.border_style.inner_sep(),
-                let _ = write!(&mut self.buffer_line, "{}", self.border_style.inner_sep());
+                    self.border_style.outer_sep(),
+                );
+            } else {
+                let _ = write!(
+                    &mut self.buffer_line,
+                    "{0:1$}{2}",
+                    "",
+                    3 * (16 - len),
+                    self.border_style.outer_sep()
+                );
             }
 
-            idx += 1;
+            let mut idx = 1;
+            for &b in self.raw_line.iter() {
+                let _ = write!(
+                    &mut self.buffer_line,
+                    "{}",
+                    self.byte_char_table[b as usize]
+                );
+
+                if idx == 8 {
+                    let _ = write!(&mut self.buffer_line, "{}", self.border_style.inner_sep());
+                }
+
+                idx += 1;
+            }
+
+            if len < 8 {
+                let _ = writeln!(
+                    &mut self.buffer_line,
+                    "{0:1$}{3}{0:2$}{4}",
+                    "",
+                    8 - len,
+                    8,
+                    self.border_style.inner_sep(),
+                    self.border_style.outer_sep(),
+                );
+            } else {
+                let _ = writeln!(
+                    &mut self.buffer_line,
+                    "{0:1$}{2}",
+                    "",
+                    16 - len,
+                    self.border_style.outer_sep()
+                );
+            }
         }
 
-        if len < 8 {
+        match squeeze_action {
-            let _ = writeln!(
-                &mut self.buffer_line,
-                "{0:1$}{3}{0:2$}{4} ",
-                "",
-                8 - len,
-                8,
-                self.border_style.inner_sep(),
-                self.border_style.outer_sep(),
-            );
-        } else {
-            let _ = writeln!(
-                &mut self.buffer_line,
-                "{0:1$}{2}",
-                "",
-                16 - len,
-                self.border_style.outer_sep()
-            );
-        }
-
-        match self.squeezer.action() {
             SqueezeAction::Print => {
                 self.buffer_line.clear();
                 let style = COLOR_OFFSET.normal();
+                let asterisk = if self.show_color {
+                    format!("{}", style.paint("*"))
+                } else {
+                    String::from("*")
+                };
                 let _ = writeln!(
                     &mut self.buffer_line,
                     "{5}{0}{1:2$}{5}{1:3$}{6}{1:3$}{5}{1:4$}{6}{1:4$}{5}",
-                    style.paint("*"),
+                    asterisk,
                     "",
                     7,
                     25,
@@ -385,171 +389,113 @@ impl<'a> Printer<'a> {
             SqueezeAction::Ignore => (),
         }
 
-        self.stdout.write_all(&self.buffer_line)?;
+        self.writer.write_all(&self.buffer_line)?;
 
         self.raw_line.clear();
         self.buffer_line.clear();
 
+        self.squeezer.advance();
+
+        Ok(())
+    }
+
+    pub fn header_was_printed(&self) -> bool {
+        self.header_was_printed
+    }
+
+    /// Loop through the given `Reader`, printing until the `Reader` buffer
+    /// is exhausted.
+    pub fn print_all<Reader: Read>(
+        &mut self,
+        mut reader: Reader
+    ) -> Result<(), Box<dyn std::error::Error>> {
+        let mut buffer = [0; BUFFER_SIZE];
+        'mainloop: loop {
+            let size = reader.read(&mut buffer)?;
+            if size == 0 {
+                break;
+            }
+
+            for b in &buffer[..size] {
+                let res = self.print_byte(*b);
+
+                if res.is_err() {
+                    // Broken pipe
+                    break 'mainloop;
+                }
+            }
+        }
+
+        // Finish last line
+        self.print_textline().ok();
+        if !self.header_was_printed() {
+            self.header();
+        }
+        self.footer();
+
         Ok(())
     }
 }
 
-fn run() -> Result<(), Box<dyn std::error::Error>> {
+#[cfg(test)]
-    let app = App::new(crate_name!())
+mod tests {
-        .setting(AppSettings::ColorAuto)
+    use std::io;
-        .setting(AppSettings::ColoredHelp)
+    use std::str;
-        .setting(AppSettings::DeriveDisplayOrder)
-        .setting(AppSettings::UnifiedHelpMessage)
-        .version(crate_version!())
-        .about(crate_description!())
-        .arg(Arg::with_name("file").help("File to display"))
-        .arg(
-            Arg::with_name("length")
-                .short("n")
-                .long("length")
-                .takes_value(true)
-                .value_name("N")
-                .help("Read only N bytes from the input"),
-        )
-        .arg(
-            Arg::with_name("bytes")
-                .short("c")
-                .long("bytes")
-                .takes_value(true)
-                .value_name("N")
-                .help("An alias for -n/--length"),
-        )
-        .arg(
-            Arg::with_name("nosqueezing")
-                .short("v")
-                .long("no-squeezing")
-                .help(
-                    "Displays all input data. Otherwise any number of groups of output \
-                     lines which would be identical to the preceding group of lines, are \
-                     replaced with a line comprised of a single asterisk.",
-                ),
-        )
-        .arg(
-            Arg::with_name("color")
-                .long("color")
-                .takes_value(true)
-                .value_name("when")
-                .possible_values(&["always", "auto", "never"])
-                .default_value("always")
-                .help(
-                    "When to use colors. The auto-mode only displays colors if the output \
-                     goes to an interactive terminal",
-                ),
-        )
-        .arg(
-            Arg::with_name("border")
-                .long("border")
-                .takes_value(true)
-                .possible_values(&["unicode", "ascii", "none"])
-                .default_value("unicode")
-                .help("Whether to draw a border with unicode or ASCII characters, or none at all"),
-        );
 
-    let matches = app.get_matches_safe()?;
+    use super::*;
 
-    let stdin = io::stdin();
+    fn assert_print_all_output<Reader: Read>(input: Reader, expected_string: String) -> () {
+        let mut output = vec![];
+        let mut printer = Printer::new(&mut output, false, BorderStyle::Unicode, true);
 
-    let mut reader: Box<dyn Read> = match matches.value_of("file") {
+        printer.print_all(input).unwrap();
-        Some(filename) => Box::new(File::open(filename)?),
-        None => Box::new(stdin.lock()),
-    };
 
-    let length_arg = matches.value_of("length").or(matches.value_of("bytes"));
+        let actual_string: &str = str::from_utf8(&output).unwrap();
-
+        assert_eq!(actual_string, expected_string)
-    if let Some(length) = length_arg.and_then(|n| {
-        if n.starts_with("0x") {
-            u64::from_str_radix(n.trim_start_matches("0x"), 16).ok()
-        } else {
-            n.parse::<u64>().ok()
-        }
-    }) {
-        reader = Box::new(reader.take(length));
     }
 
-    let show_color = match matches.value_of("color") {
+    #[test]
-        Some("never") => false,
+    fn empty_file_passes() {
-        Some("auto") => atty::is(Stream::Stdout),
+        let input = io::empty();
-        _ => true,
+        let expected_string =
-    };
+            "┌────────┬─────────────────────────┬─────────────────────────┬────────┬────────┐
-
+└────────┴─────────────────────────┴─────────────────────────┴────────┴────────┘
-    let border_style = match matches.value_of("border") {
+"
-        Some("unicode") => BorderStyle::Unicode,
+            .to_owned();
-        Some("ascii") => BorderStyle::Ascii,
+        assert_print_all_output(input, expected_string);
-        _ => BorderStyle::None,
-    };
-
-    let squeeze = !matches.is_present("nosqueezing");
-
-    // Set up Ctrl-C handler
-    let cancelled = Arc::new(AtomicBool::new(false));
-    let c = cancelled.clone();
-
-    ctrlc::set_handler(move || {
-        c.store(true, Ordering::SeqCst);
-    })
-    .expect("Error setting Ctrl-C handler");
-
-    let stdout = io::stdout();
-    let mut printer = Printer::new(stdout.lock(), show_color, border_style, squeeze);
-
-    let mut buffer = [0; BUFFER_SIZE];
-    'mainloop: loop {
-        let size = reader.read(&mut buffer)?;
-        if size == 0 {
-            break;
-        }
-
-        if cancelled.load(Ordering::SeqCst) {
-            eprintln!("hexyl has been cancelled.");
-            std::process::exit(130); // Set exit code to 128 + SIGINT
-        }
-
-        for b in &buffer[..size] {
-            let res = printer.print_byte(*b);
-
-            if res.is_err() {
-                // Broken pipe
-                break 'mainloop;
-            }
-        }
     }
 
-    // Finish last line
+    #[test]
-    printer.print_textline().ok();
+    fn short_input_passes() {
-    if !printer.header_was_printed {
+        let input = io::Cursor::new(b"spam");
-        printer.header();
+        let expected_string =
+            "┌────────┬─────────────────────────┬─────────────────────────┬────────┬────────┐
+│00000000│ 73 70 61 6d             ┊                         │spam    ┊        │
+└────────┴─────────────────────────┴─────────────────────────┴────────┴────────┘
+"
+            .to_owned();
+        assert_print_all_output(input, expected_string);
     }
-    printer.footer();
 
-    Ok(())
+    #[test]
-}
+    fn display_offset() {
+        let input = io::Cursor::new(b"spamspamspamspamspam");
+        let expected_string =
+            "┌────────┬─────────────────────────┬─────────────────────────┬────────┬────────┐
+│deadbeef│ 73 70 61 6d 73 70 61 6d ┊ 73 70 61 6d 73 70 61 6d │spamspam┊spamspam│
+│deadbeff│ 73 70 61 6d             ┊                         │spam    ┊        │
+└────────┴─────────────────────────┴─────────────────────────┴────────┴────────┘
+"
+            .to_owned();
 
-fn main() {
+        let mut output = vec![];
-    // Enable ANSI support for Windows
+        let mut printer: Printer<Vec<u8>> =
-    #[cfg(windows)]
+            Printer::new(&mut output, false, BorderStyle::Unicode, true);
-    let _ = ansi_term::enable_ansi_support();
+        printer.display_offset(0xdeadbeef);
 
-    let result = run();
+        printer.print_all(input).unwrap();
 
-    if let Err(err) = result {
+        let actual_string: &str = str::from_utf8(&output).unwrap();
-        if let Some(clap_err) = err.downcast_ref::<clap::Error>() {
+        assert_eq!(actual_string, expected_string)
-            eprint!("{}", clap_err); // Clap errors already have newlines
-
-            match clap_err.kind {
-                // The exit code should not indicate an error for --help / --version
-                clap::ErrorKind::HelpDisplayed | clap::ErrorKind::VersionDisplayed => {
-                    std::process::exit(0)
-                }
-                _ => (),
-            }
-        } else {
-            eprintln!("Error: {}", err);
-        }
-        std::process::exit(1);
     }
 }

src/squeezer.rs

@@ -54,17 +54,23 @@ impl Squeezer {
         let eq = b == self.byte;
 
         if i % LSIZE == 0 {
-            self.state = match self.state {
+            if !eq {
-                NoSqueeze => Probe,
+                self.state = Probe;
-                Probe => SqueezeActiveFirstLine,
+            } else {
-                SqueezeActiveFirstLine => SqueezeFirstLine,
+                self.state = match self.state {
-                SqueezeFirstLine => SqueezeActive,
+                    NoSqueeze => Probe,
-                SqueezeActive => Squeeze,
+                    Probe => SqueezeActiveFirstLine,
-                Squeeze => SqueezeActive,
+                    SqueezeActiveFirstLine => SqueezeFirstLine,
-                Disabled => Disabled,
+                    SqueezeFirstLine => SqueezeActive,
-            };
+                    SqueezeActive => Squeeze,
+                    Squeeze => SqueezeActive,
+                    Disabled => Disabled,
+                };
+            }
         } else if !eq {
-            if (i % LSIZE == 1 && self.state != Probe) || i % LSIZE != 1 {
+            if i % LSIZE == 1 {
+                self.state = Probe;
+            } else if i % LSIZE != 1 {
                 self.state = NoSqueeze;
             }
         }
@@ -80,17 +86,23 @@ impl Squeezer {
         }
     }
 
-    pub fn action(&mut self) -> SqueezeAction {
+    pub fn action(&self) -> SqueezeAction {
+        match self.state {
+            SqueezeState::SqueezeFirstLine => SqueezeAction::Print,
+            SqueezeState::Squeeze => SqueezeAction::Delete,
+            _ => SqueezeAction::Ignore,
+        }
+    }
+
+    pub fn advance(&mut self) {
         match self.state {
             SqueezeState::SqueezeFirstLine => {
                 self.state = SqueezeState::SqueezeActive;
-                SqueezeAction::Print
             }
             SqueezeState::Squeeze => {
                 self.state = SqueezeState::SqueezeActive;
-                SqueezeAction::Delete
             }
-            _ => SqueezeAction::Ignore,
+            _ => {}
         }
     }
 }
@@ -106,6 +118,7 @@ mod tests {
         let mut s = Squeezer::new(true);
         // just initialized
         assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
 
         let exp = vec![
             SqueezeAction::Ignore, // first line, print as is
@@ -113,22 +126,28 @@ mod tests {
             SqueezeAction::Delete, // delete reoccurring line
         ];
 
-        for z in 0..LINES {
+        let mut line = 0;
-            for i in z * LSIZE..(z + 1) * LSIZE {
+        let mut idx = 1;
-                s.process(v[i], i + 1);
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
             }
-            assert_eq!(s.action(), exp[z]);
+            let action = s.action();
+            s.advance();
+            assert_eq!(action, exp[line]);
+            line += 1;
         }
     }
 
     #[test]
     fn incomplete_while_squeeze() {
-        const LINES: usize = 3;
+        // fourth line only has 12 bytes and should be printed
-        // third line only has 12 bytes and should be printed
+        let v = vec![0u8; 3 * LSIZE + 12];
-        let v = vec![0u8; LINES * LSIZE + 12];
         let mut s = Squeezer::new(true);
         // just initialized
         assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
 
         let exp = vec![
             SqueezeAction::Ignore, // first line, print as is
@@ -137,23 +156,22 @@ mod tests {
             SqueezeAction::Ignore, // last line only 12 bytes, print it
         ];
 
-        for z in 0..LINES {
+        let mut line = 0;
-            for i in z * LSIZE..(z + 1) * LSIZE {
+        let mut idx = 1;
-                s.process(v[i], i + 1);
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
             }
-            assert_eq!(s.action(), exp[z]);
+            assert_eq!(s.action(), exp[line]);
+            s.advance();
+            line += 1;
         }
-
-        for i in LSIZE * LINES..LINES * LSIZE + 12 {
-            s.process(v[i], i + 1);
-        }
-        assert_eq!(s.action(), exp[3]);
     }
 
     #[test]
     /// all three lines are different, print all
     fn three_different_lines() {
-        const LINES: usize = 3;
         let mut v: Vec<u8> = vec![];
         v.extend(vec![0u8; 16]);
         v.extend(vec![1u8; 16]);
@@ -162,6 +180,7 @@ mod tests {
         let mut s = Squeezer::new(true);
         // just initialized
         assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
 
         let exp = vec![
             SqueezeAction::Ignore, // first line, print as is
@@ -169,11 +188,17 @@ mod tests {
             SqueezeAction::Ignore, // different
         ];
 
-        for z in 0..LINES {
+        let mut line = 0;
-            for i in z * LSIZE..(z + 1) * LSIZE {
+        let mut idx = 1;
-                s.process(v[i], i + 1);
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
             }
-            assert_eq!(s.action(), exp[z]);
+            let action = s.action();
+            assert_eq!(action, exp[line]);
+            s.advance();
+            line += 1;
         }
     }
 
@@ -188,6 +213,7 @@ mod tests {
         let mut s = Squeezer::new(true);
         // just initialized
         assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
 
         let exp = vec![
             SqueezeAction::Ignore, // first line, print as is
@@ -195,11 +221,17 @@ mod tests {
             SqueezeAction::Ignore, // different lines, print again
         ];
 
-        for z in 0..LINES {
+        let mut line = 0;
-            for i in z * LSIZE..(z + 1) * LSIZE {
+        let mut idx = 1;
-                s.process(v[i], i + 1);
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
             }
-            assert_eq!(s.action(), exp[z]);
+            let action = s.action();
+            s.advance();
+            assert_eq!(action, exp[line]);
+            line += 1;
         }
     }
 
@@ -214,24 +246,30 @@ mod tests {
         let mut s = Squeezer::new(true);
         // just initialized
         assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
 
         let exp = vec![
             SqueezeAction::Ignore, // first line, print as is
             SqueezeAction::Ignore, // print squeeze symbol
         ];
 
-        for z in 0..LINES {
+        let mut line = 0;
-            for i in z * LSIZE..(z + 1) * LSIZE {
+        let mut idx = 1;
-                s.process(v[i], i + 1);
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
             }
-            assert_eq!(s.action(), exp[z]);
+            let action = s.action();
+            s.advance();
+            assert_eq!(action, exp[line]);
+            line += 1;
         }
     }
 
     #[test]
     /// all three lines never become squeeze candidate (diff within line)
     fn never_squeeze_candidate() {
-        const LINES: usize = 3;
         let mut v = vec![];
         v.extend(vec![0u8; 8]);
         v.extend(vec![1u8; 8]);
@@ -243,6 +281,7 @@ mod tests {
         let mut s = Squeezer::new(true);
         // just initialized
         assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
 
         let exp = vec![
             SqueezeAction::Ignore, // first line, print as is
@@ -250,11 +289,135 @@ mod tests {
             SqueezeAction::Ignore, // print squeeze symbol
         ];
 
-        for z in 0..LINES {
+        let mut line = 0;
-            for i in z * LSIZE..(z + 1) * LSIZE {
+        let mut idx = 1;
-                s.process(v[i], i + 1);
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
             }
-            assert_eq!(s.action(), exp[z]);
+            let action = s.action();
+            s.advance();
+            assert_eq!(action, exp[line]);
+            line += 1;
+        }
+    }
+
+    #[test]
+    fn mix_everything() {
+        let mut v = vec![];
+        v.extend(vec![10u8; 16]); // print
+        v.extend(vec![20u8; 16]); // print
+        v.extend(vec![0u8; 16]); // print
+        v.extend(vec![0u8; 16]); // *
+        v.extend(vec![10u8; 16]); // print
+        v.extend(vec![20u8; 16]); // print
+        v.extend(vec![0u8; 16]); // print
+        v.extend(vec![0u8; 16]); // *
+        v.extend(vec![0u8; 16]); // delete
+        v.extend(vec![0u8; 16]); // delete*
+        v.extend(vec![20u8; 16]); // print
+        v.extend(vec![0u8; 12]); // print, only 12 bytes
+
+        let mut s = Squeezer::new(true);
+        // just initialized
+        assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
+
+        let exp = vec![
+            SqueezeAction::Ignore,
+            SqueezeAction::Ignore,
+            SqueezeAction::Ignore,
+            SqueezeAction::Print,
+            SqueezeAction::Ignore,
+            SqueezeAction::Ignore,
+            SqueezeAction::Ignore,
+            SqueezeAction::Print,
+            SqueezeAction::Delete,
+            SqueezeAction::Delete,
+            SqueezeAction::Ignore,
+            SqueezeAction::Ignore,
+        ];
+
+        let mut line = 0;
+        let mut idx = 1;
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
+            }
+            let action = s.action();
+            s.advance();
+            assert_eq!(action, exp[line]);
+            line += 1;
+        }
+    }
+
+    #[test]
+    fn last_char_diff() {
+        // see issue #62
+        let mut v = vec![];
+        v.extend(vec![20u8; 16]);
+        v.extend(vec![20u8; 15]);
+        v.push(61);
+        v.extend(vec![20u8; 16]);
+        v.extend(vec![20u8; 16]);
+
+        let mut s = Squeezer::new(true);
+        // just initialized
+        assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
+
+        let exp = vec![
+            SqueezeAction::Ignore, // print as is
+            SqueezeAction::Ignore, // print as is
+            SqueezeAction::Ignore, // print as is
+            SqueezeAction::Print,  // print '*' char
+        ];
+
+        let mut line = 0;
+        let mut idx = 1;
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
+            }
+            assert_eq!(s.action(), exp[line]);
+            s.advance();
+            line += 1;
+        }
+    }
+
+    #[test]
+    fn first_char_diff() {
+        // see issue #62
+        let mut v = vec![];
+        v.extend(vec![20u8; 16]);
+        v.push(61);
+        v.extend(vec![20u8; 15]);
+        v.extend(vec![20u8; 16]);
+
+        let mut s = Squeezer::new(true);
+        // just initialized
+        assert_eq!(s.action(), SqueezeAction::Ignore);
+        s.advance();
+
+        let exp = vec![
+            SqueezeAction::Ignore, // print as is
+            SqueezeAction::Ignore, // print as is
+            SqueezeAction::Ignore, // print as is
+        ];
+
+        let mut line = 0;
+        let mut idx = 1;
+        for z in v.chunks(LSIZE) {
+            for i in z {
+                s.process(*i, idx);
+                idx += 1;
+            }
+            assert_eq!(s.action(), exp[line]);
+            s.advance();
+            line += 1;
         }
     }
 }