store screenshot with git lfs

.gitattributes

@@ -0,0 +1 @@
+doc/screenshot.png filter=lfs diff=lfs merge=lfs -text

CHANGELOG.md

@@ -4,6 +4,10 @@ Dates are given in YYYY-MM-DD format - for example, the 15th of October 2021 is
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Added
+- When using the [`infer`] backend, fif is now able to detect [Mach-O](https://en.wikipedia.org/wiki/Mach-O) binaries
+
 ## v0.5.0 - 2022-01-01
 ### Changed
 - The Minimum Supported Rust Version (MSRV) is now **1.54.0**.

Cargo.lock

@@ -10,9 +10,9 @@ checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
 
 [[package]]
 name = "assert_cmd"
-version = "2.0.2"
+version = "2.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e996dc7940838b7ef1096b882e29ec30a3149a3a443cdc8dba19ed382eca1fe2"
+checksum = "93ae1ddd39efd67689deb1979d80bad3bf7f2b09c6e6117c8d1f2443b5e2f83e"
 dependencies = [
  "bstr",
  "doc-comment",
@@ -80,9 +80,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "clap"
-version = "3.0.4"
+version = "3.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d01c9347757e131122b19cd19a05c85805b68c2352a97b623efdc3c295290299"
+checksum = "7a30c3bf9ff12dfe5dae53f0a96e0febcd18420d1c0e7fad77796d9d5c4b5375"
 dependencies = [
  "atty",
  "bitflags",
@@ -98,9 +98,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "3.0.2"
+version = "3.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "448c8b00367288ad41804ac7a9e0fe58f2324a36901cb5d6b6db58be86d1db8f"
+checksum = "517358c28fcef6607bf6f76108e02afad7e82297d132a6b846dcc1fc3efcd153"
 dependencies = [
  "heck",
  "proc-macro-error",
@@ -111,9 +111,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-channel"
-version = "0.5.1"
+version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06ed27e177f16d65f0f0c22a213e17c696ace5dd64b14258b52f9417ccb52db4"
+checksum = "e54ea8bc3fb1ee042f5aace6e3c6e025d3874866da222930f70ce62aceba0bfa"
 dependencies = [
  "cfg-if",
  "crossbeam-utils",
@@ -132,9 +132,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-epoch"
-version = "0.9.5"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4ec02e091aa634e2c3ada4a392989e7c3116673ef0ac5b72232439094d73b7fd"
+checksum = "97242a70df9b89a65d0b6df3c4bf5b9ce03c5b7309019777fbde37e7537f8762"
 dependencies = [
  "cfg-if",
  "crossbeam-utils",
@@ -145,9 +145,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.5"
+version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d82cfc11ce7f2c3faef78d8a684447b40d503d9681acebed6cb728d45940c4db"
+checksum = "cfcae03edb34f947e64acdb1c33ec169824e20657e9ecb61cef6c8c74dcb8120"
 dependencies = [
  "cfg-if",
  "lazy_static",
@@ -209,6 +209,15 @@ version = "1.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "de853764b47027c2e862a995c34978ffa63c1501f2e15f987ba11bd4f9bba193"
 
+[[package]]
+name = "fastrand"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "779d043b6a0b90cc4c0ed7ee380a6504394cee7efd7db050e3774eee387324b2"
+dependencies = [
+ "instant",
+]
+
 [[package]]
 name = "fif"
 version = "0.5.0"
@@ -241,9 +250,9 @@ dependencies = [
 
 [[package]]
 name = "getrandom"
-version = "0.2.3"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fcd999463524c52659517fe2cea98493cfe485d10565e7b0fb07dbba7ad2753"
+checksum = "418d37c8b1d42553c93648be529cb70f920d3baf8ef469b74b9638df426e0b4c"
 dependencies = [
  "cfg-if",
  "libc",
@@ -279,9 +288,9 @@ dependencies = [
 
 [[package]]
 name = "indexmap"
-version = "1.7.0"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc633605454125dec4b66843673f01c7df2b89479b32e0ed634e43a91cff62a5"
+checksum = "282a6247722caba404c065016bbfa522806e51714c34f5dfc3e4a3a46fcb4223"
 dependencies = [
  "autocfg",
  "hashbrown",
@@ -341,9 +350,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.112"
+version = "0.2.113"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b03d17f364a3a042d5e5d46b053bbbf82c92c9430c592dd4c064dc6ee997125"
+checksum = "eef78b64d87775463c549fbd80e19249ef436ea3bf1de2a1eb7e717ec7fab1e9"
 
 [[package]]
 name = "lock_api"
@@ -510,9 +519,9 @@ checksum = "eb9f9e6e233e5c4a35559a617bf40a4ec447db2e84c20b55a6f83167b7e57872"
 
 [[package]]
 name = "predicates"
-version = "2.1.0"
+version = "2.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95e5a7689e456ab905c22c2b48225bb921aba7c8dfa58440d68ba13f6222a715"
+checksum = "a5aab5be6e4732b473071984b3164dbbfb7a3674d30ea5ff44410b6bcd960c3c"
 dependencies = [
  "difflib",
  "itertools",
@@ -521,15 +530,15 @@ dependencies = [
 
 [[package]]
 name = "predicates-core"
-version = "1.0.2"
+version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57e35a3326b75e49aa85f5dc6ec15b41108cf5aee58eabb1f274dd18b73c2451"
+checksum = "da1c2388b1513e1b605fcec39a95e0a9e8ef088f71443ef37099fa9ae6673fcb"
 
 [[package]]
 name = "predicates-tree"
-version = "1.0.4"
+version = "1.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "338c7be2905b732ae3984a2f40032b5e94fd8f52505b186c7d4d68d193445df7"
+checksum = "4d86de6de25020a36c6d3643a86d9a6a9f552107c0559c60ea03551b5e16c032"
 dependencies = [
  "predicates-core",
  "termtree",
@@ -734,9 +743,9 @@ dependencies = [
 
 [[package]]
 name = "serde_json"
-version = "1.0.74"
+version = "1.0.75"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ee2bb9cd061c5865d345bb02ca49fcef1391741b672b54a0bf7b679badec3142"
+checksum = "c059c05b48c5c0067d4b4b2b4f0732dd65feb52daf7e0ea09cd87e7dadc1af79"
 dependencies = [
  "itoa",
  "ryu",
@@ -745,15 +754,15 @@ dependencies = [
 
 [[package]]
 name = "siphasher"
-version = "0.3.7"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "533494a8f9b724d33625ab53c6c4800f7cc445895924a8ef649222dcb76e938b"
+checksum = "a86232ab60fa71287d7f2ddae4a7073f6b7aac33631c3015abb556f08c6d0a3e"
 
 [[package]]
 name = "smallvec"
-version = "1.7.0"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ecab6c735a6bb4139c0caafd0cc3635748bbb3acf4550e8138122099251f309"
+checksum = "f2dd574626839106c320a323308629dcb1acfc96e32a8cba364ddc61ac23ee83"
 
 [[package]]
 name = "smartstring"
@@ -782,9 +791,9 @@ checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
 
 [[package]]
 name = "syn"
-version = "1.0.84"
+version = "1.0.86"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ecb2e6da8ee5eb9a61068762a32fa9619cc591ceb055b3687f4cd4051ec2e06b"
+checksum = "8a65b3f4ffa0092e9887669db0eae07941f023991ab58ea44da8fe8e2d511c6b"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -793,13 +802,13 @@ dependencies = [
 
 [[package]]
 name = "tempfile"
-version = "3.2.0"
+version = "3.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dac1c663cfc93810f88aed9b8941d48cabf856a1b111c29a40439018d870eb22"
+checksum = "5cdb1ef4eaeeaddc8fbd371e5017057064af0911902ef36b39801f67cc6d79e4"
 dependencies = [
  "cfg-if",
+ "fastrand",
  "libc",
- "rand",
  "redox_syscall",
  "remove_dir_all",
  "winapi",
@@ -826,9 +835,9 @@ dependencies = [
 
 [[package]]
 name = "termtree"
-version = "0.2.3"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13a4ec180a2de59b57434704ccfad967f789b12737738798fa08798cd5824c16"
+checksum = "507e9898683b6c43a9aa55b64259b721b52ba226e0f3779137e50ad114a4c90b"
 
 [[package]]
 name = "textwrap"

src/mime_db.rs

@@ -42,28 +42,56 @@ cfg_if! {
 			fn init() -> Self {
 				let mut info = infer::Infer::new();
 
+				// In addition to the file inferences provided by Infer, I've also added a few of my own below. Some of them
+				// replace Infer's existing ones, some of them are less than perfect, and still others are for relatively
+				// obscure formats, so I'm not really sure whether or not they should be contributed upstream.
+
+				// OpenDocument Text (used by e.g. LibreOffice Writer)
 				info.add("application/vnd.oasis.opendocument.text", "odt", |buf| {
 					open_document_check(buf, "text")
 				});
 
+				// OpenDocument Spreadsheet (LibreOffice Calc)
 				info.add("application/vnd.oasis.opendocument.spreadsheet", "ods", |buf| {
 					open_document_check(buf, "spreadsheet")
 				});
 
+				// OpenOffice Presentation (LibreOffice Impress)
 				info.add("application/vnd.oasis.opendocument.presentation", "odp", |buf| {
 					open_document_check(buf, "presentation")
 				});
 
+				// Ren'Py Archive (Ren'Py: https://www.renpy.org/)
 				info.add("application/x-rpa", "rpa", |buf| {
 					buf.len() >= 34 && buf.starts_with(b"RPA-") && buf[7] == b' ' && buf[24] ==b' '
 				});
 
+				// Mach-O Binaries (The executable format used by macOS)
+				// my source for most of this info is this article: https://h3adsh0tzz.com/2020/01/macho-file-format/
+				// like linux's ELF binaries, mach-o binaries do not typically have an extension, but if they did, it'd
+				// probably be something like ".macho", so, that'll do i guess. fif doesn't actually use the extensions
+				// specified here anyway.
+				info.add("application/x-mach-binary", "macho", |buf| {
+					// a 32-bit mach-o header occupies 28 bits of space, so any input smaller than that cannot be a mach-o
+					// binary, even if it starts with the magic numbers.
+					// the three magic numbers that can appear are 0xFEEDFACF, 0xFEEDFACE, and 0xCAFEBABE. the code below
+					// checks for all three of these, in both big and little endian order.
+
+					// java class files also start with 0xCAFEBABE. since infer doesn't support detecting these files,
+					// collisions are not an issue. if, however, infer does gain support for identifying java class files, the
+					// 0xCAFEBABE check should be removed, as java bytecode files are far more prevalent than 32-bit universal
+					// mach-o binaries [citation needed].
+					buf.len() >= 28 && [b"\xFE\xED\xFA\xCF", b"\xFE\xED\xFA\xCE", b"\xCA\xFE\xBA\xBE", b"\xCF\xFA\xED\xFE",
+						b"\xCE\xFA\xED\xFE", b"\xBE\xBA\xFE\xCA"].iter().any(|magic_numbers| buf.starts_with(&magic_numbers[..]))
+				});
+
 				// info.add("application/x-msi", "msi", |buf| {
 				// TODO: find a way to detect MSI files properly - this just detects those weird windows OLE files and therefore
 				// also picks up on .doc files
 				// 	buf.starts_with(b"\xd0\xcf\x11\xe0\xa1\xb1\x1a\xe1")
 				// });
 
+				// Scalable Vector Graphics
 				info.add("image/svg+xml", "svg", |buf| {
 					// before doing the moderately expensive SVG check, we should make sure that the input is actually SGML-ish,
 					// by which i mean, starts with anywhere from zero to ∞-1 whitespace characters, and then a less than sign,
@@ -83,8 +111,8 @@ cfg_if! {
 					// - split the buffer up into chunks separated by the less than sign
 					// - check to see if this chunk starts with any of these identifiers:
 					let identifiers: Vec<&[u8]> = vec![b"svg", b"SVG", b"!DOCTYPE svg", b"!DOCTYPE SVG"];
-					// - if it does, the nested `any` will short circuit and immediately return true, causing the parent `any` to do
+					// - if it does, the nested `any` will short circuit and immediately return true, causing the parent `any` to
-					//   the same
+					//   do the same
 					// - and finally, if none of the chunks match, we'll return false
 
 					// TODO: this is kind of messy, i'd like to clean it up somehow :(

src/parameters.rs

@@ -7,7 +7,7 @@ use std::collections::BTreeSet;
 use std::path::PathBuf;
 
 use cfg_if::cfg_if;
-use clap::{Parser, ArgEnum};
+use clap::{ArgEnum, Parser};
 
 use crate::utils::{CLAP_LONG_VERSION, CLAP_VERSION};
 use crate::String as StringType;

src/tests/mod.rs

@@ -351,6 +351,7 @@ fn accepts_good_args() {
 /// Ensures that output from the `-V` and `--version` flags is formatted properly.
 fn check_version_output() {
 	use std::string::String;
+
 	use assert_cmd::Command;
 	use regex::Regex;
 
@@ -364,7 +365,6 @@ fn check_version_output() {
 		output
 	);
 
-
 	// test `--version` matches the format of "fif x.y.z (OS, example backend, commit #1234abc)"
 	let mut cmd = Command::cargo_bin("fif").unwrap();
 	let output = cmd.arg("--version").ok().unwrap().stdout;