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use ::bits::{Composer, ComposeResult, Parser, ParseError, ParseResult};
use ::iana::OptionCode;
use super::{OptData, ParsedOptData};
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
pub struct Expire(Option<u32>);
impl Expire {
pub fn new(expire: Option<u32>) -> Self {
Expire(expire)
}
pub fn expire(&self) -> Option<u32> {
self.0
}
}
impl OptData for Expire {
fn compose<C: AsMut<Composer>>(&self, mut target: C) -> ComposeResult<()> {
let target = target.as_mut();
target.compose_u16(OptionCode::EdnsExpire.into())?;
match self.0 {
Some(expire) => {
target.compose_u16(4)?;
target.compose_u32(expire)
}
None => {
target.compose_u16(0)
}
}
}
}
impl<'a> ParsedOptData<'a> for Expire {
fn parse(code: OptionCode, parser: &mut Parser<'a>)
-> ParseResult<Option<Self>> {
if code != OptionCode::EdnsExpire {
return Ok(None)
}
match parser.remaining() {
0 => Ok(Some(Self::new(None))),
4 => Ok(Some(Self::new(Some(parser.parse_u32()?)))),
_ => Err(ParseError::FormErr)
}
}
}