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use core::convert::TryInto;
use super::super::iana::OptionCode;
use super::super::message_builder::OptBuilder;
use super::super::octets::{
Compose, FormError, OctetsBuilder, OctetsRef, Parse, ParseError, Parser,
ShortBuf
};
use super::CodeOptData;
#[derive(Clone, Debug, Eq, Hash, PartialEq)]
pub struct KeyTag<Octets> {
octets: Octets,
}
impl<Octets> KeyTag<Octets> {
pub fn new(octets: Octets) -> Self {
KeyTag { octets }
}
pub fn push<Target: OctetsBuilder>(
builder: &mut OptBuilder<Target>,
tags: &[u16]
) -> Result<(), ShortBuf> {
let len = tags.len() * 2;
assert!(len <= ::std::u16::MAX as usize);
builder.push_raw_option(OptionCode::KeyTag, |target| {
target.append_all(|target| {
for tag in tags {
tag.compose(target)?;
}
Ok(())
})
})
}
pub fn iter(&self) -> KeyTagIter
where Octets: AsRef<[u8]> {
KeyTagIter(self.octets.as_ref())
}
}
impl<Ref: OctetsRef> Parse<Ref> for KeyTag<Ref::Range> {
fn parse(parser: &mut Parser<Ref>) -> Result<Self, ParseError> {
let len = parser.remaining();
if len % 2 == 1 {
Err(FormError::new("invalid keytag length").into())
}
else {
Ok(Self::new(parser.parse_octets(len)?))
}
}
fn skip(parser: &mut Parser<Ref>) -> Result<(), ParseError> {
if parser.remaining() % 2 == 1 {
Err(FormError::new("invalid keytag length").into())
}
else {
parser.advance_to_end();
Ok(())
}
}
}
impl<Octets: AsRef<[u8]>> Compose for KeyTag<Octets> {
fn compose<T: OctetsBuilder>(
&self,
target: &mut T
) -> Result<(), ShortBuf> {
target.append_slice(self.octets.as_ref())
}
}
impl<Octets> CodeOptData for KeyTag<Octets> {
const CODE: OptionCode = OptionCode::KeyTag;
}
impl<'a, Octets: AsRef<[u8]>> IntoIterator for &'a KeyTag<Octets> {
type Item = u16;
type IntoIter = KeyTagIter<'a>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
#[derive(Clone, Copy, Debug)]
pub struct KeyTagIter<'a>(&'a [u8]);
impl<'a> Iterator for KeyTagIter<'a> {
type Item = u16;
fn next(&mut self) -> Option<Self::Item> {
if self.0.len() < 2 {
None
}
else {
let (item, tail) = self.0.split_at(2);
self.0 = tail;
Some(u16::from_be_bytes(item.try_into().unwrap()))
}
}
}