liteboxfs 0.2.0

A modern POSIX filesystem in a SQLite database
Documentation 
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use std::time::{Duration, SystemTime, UNIX_EPOCH};

use crate::errors::InternalError;

const NANOS_PER_SEC: u128 = 1_000_000_000;

pub fn system_time_to_nanos(time: SystemTime) -> crate::Result<i128> {
    if time > UNIX_EPOCH {
        Ok(time
            .duration_since(UNIX_EPOCH)
            .map_err(|err| InternalError::Other {
                reason: err.to_string(),
            })?
            .as_nanos() as i128)
    } else {
        let duration = UNIX_EPOCH
            .duration_since(time)
            .map_err(|err| InternalError::Other {
                reason: err.to_string(),
            })?;
        Ok(-(duration.as_nanos() as i128))
    }
}

pub fn system_time_from_nanos(nanos: i128) -> SystemTime {
    let unsigned_nanos = nanos.unsigned_abs();
    let secs = u64::try_from(unsigned_nanos / NANOS_PER_SEC)
        .expect("Overflow decoding bytes to timestamp.");
    let subsec_nanos = (unsigned_nanos % NANOS_PER_SEC) as u32;

    if nanos < 0 {
        UNIX_EPOCH - Duration::new(secs, subsec_nanos)
    } else {
        UNIX_EPOCH + Duration::new(secs, subsec_nanos)
    }
}