Correct length calculation when writing TXT records

diff --git a/src/rr.rs b/src/rr.rs
index 3d1a6a8548ee01d9038001a02f2a1e3d34a46aa9..14826e3d1e00c53c76b691e4c06ef9ed762dd791 100644 (file)
--- a/src/rr.rs
+++ b/src/rr.rs
@@ -189,7 +189,7 @@ impl StaticRecord for Txt {
                Ok(Txt { name, data: parsed_data })
        }
        fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
-               let len = (self.data.len() + self.data.len() / 255 + 1) as u16;
+               let len = (self.data.len() + (self.data.len() + 254) / 255) as u16;
                out.extend_from_slice(&len.to_be_bytes());
 
                let mut data_write = &self.data[..];