pkstrings: impl TryFrom<u8> for PKString

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

pkstrings/src/lib.rs

@@ -122,6 +122,21 @@ impl fmt::Display for PKString {
     }
 }
 
+impl TryFrom<u8> for PKString {
+    type Error = Error;
+
+    fn try_from(ord: u8) -> Result<PKString, Error> {
+        let mut buf = String::with_capacity(1);
+
+        match hextostr(ord) {
+            Some(chr) => buf.push(chr.clone()),
+            None => return Err(Error::InvalidCharacter),
+        }
+
+        Ok(PKString(buf))
+    }
+}
+
 impl TryFrom<&[u8]> for PKString {
     type Error = Error;