partly working implementation

src/utils.rs

@@ -0,0 +1,26 @@
+use nix::time::{clock_gettime, ClockId};
+
+pub(crate) struct Utils {}
+
+impl Utils {
+    pub(crate) fn a_else_b(a: f64, b: f64) -> f64 {
+        return if a > 0.0 { a } else { b };
+    }
+    pub(crate) fn ewma_factor(tick: f64, dur: f64) -> f64 {
+        ((0.5_f64).ln() / (dur / tick)).exp()
+    }
+    pub(crate) fn get_current_time() -> (f64, f64) {
+        let time = clock_gettime(ClockId::CLOCK_MONOTONIC).unwrap();
+        (time.tv_sec() as f64, time.tv_nsec() as f64)
+    }
+
+    #[cfg(target_endian = "big")]
+    pub(crate) fn to_ne(val: u64) -> u64 {
+        val.to_be()
+    }
+
+    #[cfg(target_endian = "little")]
+    pub(crate) fn to_ne(val: u32) -> u32 {
+        val.to_le()
+    }
+}