pkstring: implement TryFrom<String> and TryFrom<&str>

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

pkstrings/src/lib.rs

@@ -135,3 +135,31 @@ impl Into<Vec<u8>> for PKString {
         vec
     }
 }
+
+impl TryFrom<&str> for PKString {
+    type Error = Error;
+
+    fn try_from(data: &str) -> Result<PKString, Error> {
+        for chr in data.chars() {
+            if ! STRTOHEX.contains_key(&chr) {
+                return Err(Error::InvalidCharacter);
+            }
+        }
+
+        Ok(PKString(String::from(data)))
+    }
+}
+
+impl TryFrom<String> for PKString {
+    type Error = Error;
+
+    fn try_from(data: String) -> Result<PKString, Error> {
+        for chr in data.chars() {
+            if ! STRTOHEX.contains_key(&chr) {
+                return Err(Error::InvalidCharacter);
+            }
+        }
+
+        Ok(PKString(data))
+    }
+}