Add helpers

src/netpod.rs

@@ -4523,7 +4523,11 @@ pub fn req_uri_to_url(uri: &Uri) -> Result<Url, UriError> {
     }
 }
 
-pub unsafe fn extltref<'a, 'b, T>(t: &'a T) -> &'b T {
+pub unsafe fn extltref<'a, 'b, T>(x: &'a T) -> &'b T {
+    &*(x as *const T)
+}
+
+pub unsafe fn extltref2<'a, 'b, T>(t: &'a T) -> &'b T {
     core::mem::transmute(t)
 }
 

src/range/evrange.rs

@@ -198,6 +198,13 @@ impl SeriesRange {
             SeriesRange::PulseRange(x) => x.end - x.beg,
         }
     }
+
+    pub fn to_time(&self) -> Option<NanoRange> {
+        match self {
+            SeriesRange::TimeRange(x) => Some(x.clone()),
+            SeriesRange::PulseRange(_) => None,
+        }
+    }
 }
 
 impl fmt::Debug for SeriesRange {

src/ttl.rs

@@ -74,6 +74,15 @@ impl RetentionTime {
             RetentionTime::Long => 12,
         }
     }
+
+    pub fn from_str(x: &str) -> Result<Self, Error> {
+        match x {
+            "short" => Ok(Self::Short),
+            "medium" => Ok(Self::Medium),
+            "long" => Ok(Self::Long),
+            _ => Err(Error::Parse),
+        }
+    }
 }
 
 impl fmt::Display for RetentionTime {