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use std::{
fmt::{self, Display, Formatter, Write},
io,
ops::{BitAnd, BitAndAssign, BitOr, BitOrAssign, Not},
path::Path,
};
#[cfg(unix)]
use std::fs;
#[cfg(unix)]
use std::os::unix::fs::MetadataExt;
pub type Class = u32;
pub const USER: Class = 0b111000000;
pub const GROUP: Class = 0b000111000;
pub const OTHERS: Class = 0b000000111;
pub const ALL: Class = 0b111111111;
pub type Permission = u32;
pub const READ: Permission = 0b100100100;
pub const WRITE: Permission = 0b010010010;
pub const EXEC: Permission = 0b001001001;
pub const USER_READ: Mode = Mode::new().with_class_perm(USER, READ);
pub const USER_WRITE: Mode = Mode::new().with_class_perm(USER, WRITE);
pub const USER_EXEC: Mode = Mode::new().with_class_perm(USER, EXEC);
pub const GROUP_READ: Mode = Mode::new().with_class_perm(GROUP, READ);
pub const GROUP_WRITE: Mode = Mode::new().with_class_perm(GROUP, WRITE);
pub const GROUP_EXEC: Mode = Mode::new().with_class_perm(GROUP, EXEC);
pub const OTHERS_READ: Mode = Mode::new().with_class_perm(OTHERS, READ);
pub const OTHERS_WRITE: Mode = Mode::new().with_class_perm(OTHERS, WRITE);
pub const OTHERS_EXEC: Mode = Mode::new().with_class_perm(OTHERS, EXEC);
pub const ALL_READ: Mode = Mode::new().with_class_perm(ALL, READ);
pub const ALL_WRITE: Mode = Mode::new().with_class_perm(ALL, WRITE);
pub const ALL_EXEC: Mode = Mode::new().with_class_perm(ALL, EXEC);
#[derive(Clone, Copy, PartialEq, Eq)]
pub struct Mode {
value: u32,
}
impl Default for Mode {
fn default() -> Self {
Self { value: 0 }
}
}
impl fmt::Debug for Mode {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.to_string())
}
}
impl From<u32> for Mode {
fn from(value: u32) -> Self {
Self { value }
}
}
impl BitAnd for Mode {
type Output = Self;
fn bitand(self, other: Self) -> Self {
Self {
value: self.value & other.value,
}
}
}
impl BitAndAssign for Mode {
fn bitand_assign(&mut self, other: Self) {
self.value &= other.value;
}
}
impl BitOr for Mode {
type Output = Self;
fn bitor(self, other: Self) -> Self {
Self {
value: self.value | other.value,
}
}
}
impl BitOrAssign for Mode {
fn bitor_assign(&mut self, other: Self) {
self.value |= other.value;
}
}
impl Not for Mode {
type Output = Self;
fn not(self) -> Self::Output {
Self { value: !self.value }
}
}
impl Display for Mode {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
f.write_char(if self.has(USER_READ) { 'r' } else { '-' })?;
f.write_char(if self.has(USER_WRITE) { 'w' } else { '-' })?;
f.write_char(if self.has(USER_EXEC) { 'x' } else { '-' })?;
f.write_char(if self.has(GROUP_READ) { 'r' } else { '-' })?;
f.write_char(if self.has(GROUP_WRITE) { 'w' } else { '-' })?;
f.write_char(if self.has(GROUP_EXEC) { 'x' } else { '-' })?;
f.write_char(if self.has(OTHERS_READ) { 'r' } else { '-' })?;
f.write_char(if self.has(OTHERS_WRITE) { 'w' } else { '-' })?;
f.write_char(if self.has(OTHERS_EXEC) { 'x' } else { '-' })?;
Ok(())
}
}
impl Mode {
#[inline(always)]
pub const fn new() -> Self {
Self { value: 0 }
}
#[inline(always)]
pub const fn all() -> Self {
Self { value: 0b111111111 }
}
#[allow(unused_variables)]
pub fn try_from(path: &Path) -> Result<Self, io::Error> {
#[cfg(unix)]
{
let metadata = fs::metadata(&path)?;
Ok(Mode::from(metadata.mode()))
}
#[cfg(not(unix))]
Ok(Self::all())
}
#[inline(always)]
pub const fn is_exe(self) -> bool {
(self.value & 0o111) != 0
}
#[inline(always)]
pub const fn has(self, other: Self) -> bool {
self.value & other.value == other.value
}
#[inline(always)]
pub const fn with_class_perm(self, class: Class, perm: Permission) -> Self {
Self {
value: self.value | (class & perm),
}
}
#[inline(always)]
pub const fn without_class_perm(self, class: Class, perm: Permission) -> Self {
Self {
value: self.value & !(class & perm),
}
}
#[inline(always)]
pub const fn with(self, other: Mode) -> Self {
Self {
value: self.value | other.value,
}
}
#[inline(always)]
pub const fn without(self, other: Mode) -> Self {
Self {
value: self.value & !other.value,
}
}
}
#[test]
fn test_build() {
let mut m = Mode::new()
.with_class_perm(ALL, READ)
.with_class_perm(USER, WRITE);
assert_eq!("rw-r--r--", m.to_string());
m |= ALL_EXEC;
assert_eq!("rwxr-xr-x", m.to_string());
m &= !USER_READ;
assert_eq!("-wxr-xr-x", m.to_string());
}
#[test]
fn test_print() {
assert_eq!("rw-r--r--", Mode::from(0b110100100).to_string());
assert_eq!("rw-r--r--", Mode::from(0o644).to_string());
let mu = Mode::from(0o600);
let mo = Mode::from(0o004);
assert_eq!("rw-------", mu.to_string());
assert_eq!("------r--", mo.to_string());
let muo = mu | mo;
assert_eq!("rw----r--", muo.to_string());
}