use std::borrow::Cow;
use crate::dns::{WireFormat, MAX_NULL_LENGTH};
use super::RR;
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
pub struct NULL<'a> {
length: u16,
data: Cow<'a, [u8]>,
}
impl<'a> RR for NULL<'a> {
const TYPE_CODE: u16 = 10;
}
impl<'a> NULL<'a> {
pub fn new(data: &'a [u8]) -> crate::Result<Self> {
if data.len() > MAX_NULL_LENGTH {
return Err(crate::SimpleDnsError::InvalidDnsPacket);
}
Ok(Self {
length: data.len() as u16,
data: Cow::Borrowed(data),
})
}
pub fn get_data(&'_ self) -> &'_ [u8] {
&self.data
}
pub fn into_owned<'b>(self) -> NULL<'b> {
NULL {
length: self.length,
data: self.data.into_owned().into(),
}
}
}
impl<'a> WireFormat<'a> for NULL<'a> {
fn parse(data: &'a [u8], position: &mut usize) -> crate::Result<Self>
where
Self: Sized,
{
let data = &data[*position..];
*position += data.len();
Self::new(data)
}
fn write_to<T: std::io::Write>(&self, out: &mut T) -> crate::Result<()> {
out.write_all(&self.data)
.map_err(crate::SimpleDnsError::from)
}
fn len(&self) -> usize {
self.length as usize
}
}