File size: 1,292 Bytes
224e773 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | //! Environment bitmask persistence
pub struct EnvironmentBitmask {
mask: u64,
}
impl EnvironmentBitmask {
pub fn new() -> Self {
EnvironmentBitmask { mask: 0 }
}
pub fn set_bit(&mut self, idx: usize) {
if idx < 64 {
self.mask |= 1 << idx;
}
}
pub fn get_bit(&self, idx: usize) -> bool {
if idx < 64 {
(self.mask & (1 << idx)) != 0
} else {
false
}
}
pub fn to_bytes(&self) -> [u8; 8] {
self.mask.to_le_bytes()
}
pub fn from_bytes(bytes: &[u8; 8]) -> Self {
EnvironmentBitmask {
mask: u64::from_le_bytes(*bytes),
}
}
}
impl Default for EnvironmentBitmask {
fn default() -> Self {
Self::new()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn set_get_bit() {
let mut mask = EnvironmentBitmask::new();
mask.set_bit(5);
assert!(mask.get_bit(5));
}
#[test]
fn round_trip() {
let mut mask = EnvironmentBitmask::new();
mask.set_bit(10);
let bytes = mask.to_bytes();
let mask2 = EnvironmentBitmask::from_bytes(&bytes);
assert!(mask2.get_bit(10));
}
}
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