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#![no_std]
#![forbid(unsafe_code)]
pub trait List {
fn find<'a, T>(&self, labels: T) -> Info
where
T: Iterator<Item = &'a [u8]>;
#[inline]
fn suffix<'a>(&self, name: &'a [u8]) -> Option<Suffix<'a>> {
let mut labels = name.rsplit(|x| *x == b'.');
let fqdn = if name.ends_with(b".") {
labels.next();
true
} else {
false
};
let Info { mut len, typ } = self.find(labels);
if fqdn {
len += 1;
}
if len == 0 {
return None;
}
let offset = name.len() - len;
let bytes = name.get(offset..)?;
Some(Suffix { bytes, fqdn, typ })
}
#[inline]
fn domain<'a>(&self, name: &'a [u8]) -> Option<Domain<'a>> {
let suffix = self.suffix(name)?;
let name_len = name.len();
let suffix_len = suffix.bytes.len();
if name_len < suffix_len + 2 {
return None;
}
let offset = name_len - (1 + suffix_len);
let subdomain = name.get(..offset)?;
let root_label = subdomain.rsplitn(2, |x| *x == b'.').next()?;
let registrable_len = root_label.len() + 1 + suffix_len;
let offset = name_len - registrable_len;
let bytes = name.get(offset..)?;
Some(Domain { bytes, suffix })
}
}
impl<L: List> List for &'_ L {
#[inline]
fn find<'a, T>(&self, labels: T) -> Info
where
T: Iterator<Item = &'a [u8]>,
{
(*self).find(labels)
}
}
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
pub enum Type {
Icann,
Private,
}
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
pub struct Info {
pub len: usize,
pub typ: Option<Type>,
}
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
pub struct Suffix<'a> {
bytes: &'a [u8],
fqdn: bool,
typ: Option<Type>,
}
impl Suffix<'_> {
#[inline]
pub const fn as_bytes(&self) -> &[u8] {
&self.bytes
}
#[inline]
pub const fn is_fqdn(&self) -> bool {
self.fqdn
}
#[inline]
pub const fn typ(&self) -> Option<Type> {
self.typ
}
#[inline]
pub fn is_known(&self) -> bool {
self.typ.is_some()
}
}
impl PartialEq<&[u8]> for Suffix<'_> {
fn eq(&self, other: &&[u8]) -> bool {
self.bytes == *other
}
}
impl PartialEq<&str> for Suffix<'_> {
fn eq(&self, other: &&str) -> bool {
self.bytes == other.as_bytes()
}
}
#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug)]
pub struct Domain<'a> {
bytes: &'a [u8],
suffix: Suffix<'a>,
}
impl Domain<'_> {
#[inline]
pub const fn as_bytes(&self) -> &[u8] {
&self.bytes
}
#[inline]
pub const fn suffix(&self) -> Suffix<'_> {
self.suffix
}
}
impl PartialEq<&[u8]> for Domain<'_> {
fn eq(&self, other: &&[u8]) -> bool {
self.bytes == *other
}
}
impl PartialEq<&str> for Domain<'_> {
fn eq(&self, other: &&str) -> bool {
self.bytes == other.as_bytes()
}
}