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use core::cmp::Ordering;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
/// How accurate the underlying clock device is expected to be when not
/// synchronized.
pub enum ClockAccuracy {
/// Reserved
Reserved,
/// Accurate within 1 ps
PS1,
/// Accurate within 2.5 ps
PS2_5,
/// Accurate within 10 ps
PS10,
/// Accurate within 25 ps
PS25,
/// Accurate within 100 ps
PS100,
/// Accurate within 250 ps
PS250,
/// Accurate within 1 ns
NS1,
/// Accurate within 2.5 ns
NS2_5,
/// Accurate within 10 ns
NS10,
/// Accurate within 25 ns
NS25,
/// Accurate within 100 ns
NS100,
/// Accurate within 250 ns
NS250,
/// Accurate within 1 us
US1,
/// Accurate within 2.5 us
US2_5,
/// Accurate within 10 us
US10,
/// Accurate within 25 us
US25,
/// Accurate within 100 us
US100,
/// Accurate within 250 us
US250,
/// Accurate within 1 ms
MS1,
/// Accurate within 2.5 ms
MS2_5,
/// Accurate within 10 ms
MS10,
/// Accurate within 25 ms
MS25,
/// Accurate within 100 ms
MS100,
/// Accurate within 250 ms
MS250,
/// Accurate within 1 s
S1,
/// Accurate within 10 s
S10,
/// Accurate within >10 s
SGT10,
/// Specific to a profile
ProfileSpecific(u8),
/// Accuracy is unknown
Unknown,
}
impl ClockAccuracy {
/// Converts enum to u8 literals
pub fn to_primitive(self) -> u8 {
match self {
Self::Reserved => 0x00,
Self::PS1 => 0x17,
Self::PS2_5 => 0x18,
Self::PS10 => 0x19,
Self::PS25 => 0x1a,
Self::PS100 => 0x1b,
Self::PS250 => 0x1c,
Self::NS1 => 0x1d,
Self::NS2_5 => 0x1e,
Self::NS10 => 0x1f,
Self::NS25 => 0x20,
Self::NS100 => 0x21,
Self::NS250 => 0x22,
Self::US1 => 0x23,
Self::US2_5 => 0x24,
Self::US10 => 0x25,
Self::US25 => 0x26,
Self::US100 => 0x27,
Self::US250 => 0x28,
Self::MS1 => 0x29,
Self::MS2_5 => 0x2a,
Self::MS10 => 0x2b,
Self::MS25 => 0x2c,
Self::MS100 => 0x2d,
Self::MS250 => 0x2e,
Self::S1 => 0x2f,
Self::S10 => 0x30,
Self::SGT10 => 0x31,
Self::ProfileSpecific(value) => 0x80 + value,
Self::Unknown => 0xfe,
}
}
pub(crate) fn from_primitive(value: u8) -> Self {
match value {
0x00..=0x16 | 0x32..=0x7f | 0xff => Self::Reserved,
0x17 => Self::PS1,
0x18 => Self::PS2_5,
0x19 => Self::PS10,
0x1a => Self::PS25,
0x1b => Self::PS100,
0x1c => Self::PS250,
0x1d => Self::NS1,
0x1e => Self::NS2_5,
0x1f => Self::NS10,
0x20 => Self::NS25,
0x21 => Self::NS100,
0x22 => Self::NS250,
0x23 => Self::US1,
0x24 => Self::US2_5,
0x25 => Self::US10,
0x26 => Self::US25,
0x27 => Self::US100,
0x28 => Self::US250,
0x29 => Self::MS1,
0x2a => Self::MS2_5,
0x2b => Self::MS10,
0x2c => Self::MS25,
0x2d => Self::MS100,
0x2e => Self::MS250,
0x2f => Self::S1,
0x30 => Self::S10,
0x31 => Self::SGT10,
0x80..=0xfd => Self::ProfileSpecific(value - 0x80),
0xfe => ClockAccuracy::Unknown,
}
}
/// high accuracy to low accuracy
pub(crate) fn cmp_numeric(&self, other: &Self) -> Ordering {
self.to_primitive().cmp(&other.to_primitive())
}
}
impl Default for ClockAccuracy {
fn default() -> Self {
Self::Unknown
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn network_protocol_values() {
for i in 0..u8::MAX {
let protocol = ClockAccuracy::from_primitive(i);
if !matches!(protocol, ClockAccuracy::Reserved) {
assert_eq!(protocol.to_primitive(), i);
}
}
assert_eq!(ClockAccuracy::ProfileSpecific(5).to_primitive(), 0x85);
}
#[test]
fn ordering() {
// the inaccuracy of PS1 is less than of PS10
let a = ClockAccuracy::PS1;
let b = ClockAccuracy::PS10;
assert_eq!(a.cmp_numeric(&b), Ordering::Less);
}
}