Add tag structure

radius/src/lib.rs

@@ -6,3 +6,4 @@ pub mod request;
 pub mod rfc2865;
 pub mod rfc2866;
 pub mod rfc2867;
+pub mod tag;

radius/src/tag.rs

@@ -0,0 +1,41 @@
+#[derive(Debug, PartialEq)]
+pub struct Tag {
+    pub(crate) value: u8,
+}
+
+impl Tag {
+    pub fn get_value(&self) -> u8 {
+        self.value
+    }
+
+    pub fn is_zero(&self) -> bool {
+        self.value == 0
+    }
+
+    pub fn is_valid_value(&self) -> bool {
+        1 <= self.value && self.value <= 0x1f
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tag::Tag;
+
+    #[test]
+    fn test_is_zero() {
+        let tag = Tag { value: 0 };
+        assert_eq!(tag.is_zero(), true);
+        let tag = Tag { value: 1 };
+        assert_eq!(tag.is_zero(), false);
+    }
+
+    #[test]
+    fn test_is_valid_value() {
+        let tag = Tag { value: 1 };
+        assert_eq!(tag.is_valid_value(), true);
+        let tag = Tag { value: 0 };
+        assert_eq!(tag.is_valid_value(), false);
+        let tag = Tag { value: 0x20 };
+        assert_eq!(tag.is_valid_value(), false);
+    }
+}