chore: minor improvements

src/message/utf8_b.rs

@@ -23,15 +23,8 @@ pub fn decode(s: &str) -> Option<String> {
         let s = s.split_at(10).1;
         let s = s.split_at(s.len() - 2).0;
         base64::decode(s)
-            .map_err(|_| ())
-            .and_then(|v| {
-                if let Ok(s) = from_utf8(&v) {
-                    Ok(Some(s.into()))
-                } else {
-                    Err(())
-                }
-            })
-            .unwrap_or(None)
+            .ok()
+            .and_then(|v| from_utf8(&v).ok().map(|s| s.into()))
     } else {
         Some(s.into())
     }

src/transport/smtp/client/mod.rs

@@ -40,7 +40,7 @@ impl ClientCodec {
     }
 
     /// Adds transparency
-    fn encode(&mut self, frame: &[u8], buf: &mut Vec<u8>) -> Result<(), Error> {
+    fn encode(&mut self, frame: &[u8], buf: &mut Vec<u8>) {
         match frame.len() {
             0 => {
                 match self.escape_count {
@@ -50,7 +50,6 @@ impl ClientCodec {
                     _ => unreachable!(),
                 }
                 self.escape_count = 0;
-                Ok(())
             }
             _ => {
                 let mut start = 0;
@@ -69,7 +68,6 @@ impl ClientCodec {
                     }
                 }
                 buf.extend_from_slice(&frame[start..]);
-                Ok(())
             }
         }
     }
@@ -283,7 +281,7 @@ impl SmtpConnection {
     pub fn message(&mut self, message: &[u8]) -> Result<Response, Error> {
         let mut out_buf: Vec<u8> = vec![];
         let mut codec = ClientCodec::new();
-        codec.encode(message, &mut out_buf)?;
+        codec.encode(message, &mut out_buf);
         self.write(out_buf.as_slice())?;
         self.write(b"\r\n.\r\n")?;
         self.read_response()
@@ -346,15 +344,15 @@ mod test {
         let mut codec = ClientCodec::new();
         let mut buf: Vec<u8> = vec![];
 
-        assert!(codec.encode(b"test\r\n", &mut buf).is_ok());
-        assert!(codec.encode(b".\r\n", &mut buf).is_ok());
-        assert!(codec.encode(b"\r\ntest", &mut buf).is_ok());
-        assert!(codec.encode(b"te\r\n.\r\nst", &mut buf).is_ok());
-        assert!(codec.encode(b"test", &mut buf).is_ok());
-        assert!(codec.encode(b"test.", &mut buf).is_ok());
-        assert!(codec.encode(b"test\n", &mut buf).is_ok());
-        assert!(codec.encode(b".test\n", &mut buf).is_ok());
-        assert!(codec.encode(b"test", &mut buf).is_ok());
+        codec.encode(b"test\r\n", &mut buf);
+        codec.encode(b".\r\n", &mut buf);
+        codec.encode(b"\r\ntest", &mut buf);
+        codec.encode(b"te\r\n.\r\nst", &mut buf);
+        codec.encode(b"test", &mut buf);
+        codec.encode(b"test.", &mut buf);
+        codec.encode(b"test\n", &mut buf);
+        codec.encode(b".test\n", &mut buf);
+        codec.encode(b"test", &mut buf);
         assert_eq!(
             String::from_utf8(buf).unwrap(),
             "test\r\n..\r\n\r\ntestte\r\n..\r\nsttesttest.test\n.test\ntest"

src/transport/smtp/client/net.rs

@@ -99,9 +99,8 @@ impl NetworkStream {
         ) -> Result<TcpStream, Error> {
             let addrs = server.to_socket_addrs()?;
             for addr in addrs {
-                let result = TcpStream::connect_timeout(&addr, timeout);
-                if result.is_ok() {
-                    return result.map_err(|e| e.into());
+                if let Ok(result) = TcpStream::connect_timeout(&addr, timeout) {
+                    return Ok(result);
                 }
             }
             Err(Error::Client("Could not connect"))