Function update_message_length

src/protocol/codec.rs:430–433

(dst: &mut BytesMut, len_pos: usize)

}

fn update_message_length(dst: &mut BytesMut, len_pos: usize) {
    let len = (dst.len() - len_pos) as i32;
    dst[len_pos..len_pos+4].copy_from_slice(&len.to_be_bytes());
}