feat: Use fixed size buffer for receiving packet

src/tftp/packet.rs

@@ -310,8 +310,8 @@ impl Packet {
     }
 
     pub async fn recv_from(socket: &UdpSocket) -> Result<(Self, SocketAddr), Error> {
-        let mut buf = Vec::with_capacity(PACKET_SIZE);
-        let (_, src) = socket.recv_buf_from(&mut buf).await?;
+        let mut buf = [0u8; PACKET_SIZE];
+        let (_, src) = socket.recv_from(&mut buf).await?;
 
         let packet = buf.try_into()?;
 
@@ -342,10 +342,12 @@ impl TryFrom<&Packet> for Vec<u8> {
     }
 }
 
-impl TryFrom<Vec<u8>> for Packet {
+impl TryFrom<[u8; PACKET_SIZE]> for Packet {
     type Error = Error;
 
-    fn try_from(buf: Vec<u8>) -> Result<Self, <Packet as TryFrom<Vec<u8>>>::Error> {
+    fn try_from(
+        buf: [u8; PACKET_SIZE],
+    ) -> Result<Self, <Packet as TryFrom<[u8; PACKET_SIZE]>>::Error> {
         let mut reader = BufReader::new(Cursor::new(buf));
 
         Packet::decode(&mut reader)