Fix crash in server due to overeager parsing

src/lib.rs

@@ -320,7 +320,7 @@ fn derive_protocol(input: proc_macro2::TokenStream) -> proc_macro2::TokenStream
                                 Ok(n) => {
                                     #debug("Received {} bytes (server)", n);
                                     buf.extend_from_slice(&read_buf[..n]);
-                                    loop {
+                                    while buf.len() >= 4 {
                                         let len = u32::from_le_bytes(buf[..4].try_into().expect("Failed to convert bytes to u32"));
                                         if buf.len() >= (4 + len as usize) {
                                             let serialized = std::str::from_utf8(&buf[4..(4 + len as usize)]).expect("Failed to convert bytes to string");