#2 Added IpAddr from u32 function. Finally ready to integrate it into subnet calculation

src/networking/ip.rs

@@ -58,6 +58,25 @@ impl IpAddr {
     }
 }
 
+impl From<IpAddr> for u32 {
+    /// Function that converts an Ip address
+    /// into an Unsigned 32 bit integer.
+    /// 
+    /// # Limitation
+    /// Currently only works for IPs of type IPv4
+    /// # Example
+    /// ```
+    /// let ip: IpAddr = IpAddr::V4(127, 0, 0, 1);
+    /// 
+    /// let ip_u32: u32 = u32::from(ip);
+    /// >>> ip_u32 = 2130706433;
+    /// ```
+    fn from(ip: IpAddr) -> Self {
+        u32::from_be_bytes(ip.to_arr().unwrap())
+    }
+}
+
+impl From<u32> for IpAddr {
     /// Function that converts an Unsigned 32-bit Ip address
     /// into an IpAddr
     /// 
@@ -67,12 +86,11 @@ impl IpAddr {
     /// ```
     /// let ip: u32 = 2_130_706_433;
     /// 
-    /// let ip_u32: u32 = u32::from(ip);
-    /// ip_u32 = 2130706433;
+    /// let ip_addr: u32 = IpAddr::from(ip);
+    /// >>> ip_addr = IpAddr::V4(127, 0, 0, 1);
     /// ```
-impl From<IpAddr> for u32 {
-    fn from(ip: IpAddr) -> Self {
-        u32::from_be_bytes(ip.to_arr().unwrap())
+    fn from(ip: u32) -> Self {
+        IpAddr::from_arr(&(ip.to_be_bytes() as [u8; 4])).unwrap()
     }
 }
 
@@ -202,4 +220,23 @@ mod tests {
         let ip = IpAddr::V4(255, 255, 255, 255);
         assert_eq!(u32::MAX, u32::from(ip));
     }
+
+    #[test]
+    /// Tests the conversion of an u32 IPv4 Address to
+    /// an IpAddr
+    fn u32_to_ipaddr() 
+    {
+        use super::*;
+        let ip = u32::from(IpAddr::V4(0, 0, 0, 0));
+        assert_eq!(IpAddr::V4(0, 0, 0, 0), IpAddr::from(ip));
+        
+        let ip = u32::from(IpAddr::V4(127, 0, 0, 1));
+        assert_eq!(IpAddr::V4(127, 0, 0, 1), IpAddr::from(ip));
+
+        let ip = u32::from(IpAddr::V4(10, 10, 10, 0));
+        assert_eq!(IpAddr::V4(10, 10, 10, 0), IpAddr::from(ip));
+
+        let ip = u32::from(IpAddr::V4(255, 255, 255, 255));
+        assert_eq!(IpAddr::V4(255, 255, 255, 255), IpAddr::from(ip));
+    }
 }