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use std::convert::From;
use std::cmp::Ordering;
use ::serialize::binary::*;
use ::error::*;
#[derive(Debug, PartialEq, Eq, Hash, Copy, Clone)]
#[allow(dead_code)]
pub enum DNSClass {
IN,
CH,
HS,
NONE,
ANY,
OPT(u16),
}
impl DNSClass {
pub fn from_str(str: &str) -> DecodeResult<Self> {
match str {
"IN" => Ok(DNSClass::IN),
"CH" => Ok(DNSClass::CH),
"HS" => Ok(DNSClass::HS),
"NONE" => Ok(DNSClass::NONE),
"ANY" | "*" => Ok(DNSClass::ANY),
_ => Err(DecodeError::UnknownDnsClassStr(str.to_string())),
}
}
pub fn from_u16(value: u16) -> DecodeResult<Self> {
match value {
1 => Ok(DNSClass::IN),
3 => Ok(DNSClass::CH),
4 => Ok(DNSClass::HS),
254 => Ok(DNSClass::NONE),
255 => Ok(DNSClass::ANY),
_ => Err(DecodeError::UnknownDnsClassValue(value)),
}
}
pub fn for_opt(value: u16) -> Self {
DNSClass::OPT(value)
}
}
impl BinSerializable<DNSClass> for DNSClass {
fn read(decoder: &mut BinDecoder) -> DecodeResult<Self> {
Self::from_u16(try!(decoder.read_u16()))
}
fn emit(&self, encoder: &mut BinEncoder) -> EncodeResult {
encoder.emit_u16((*self).into())
}
}
impl From<DNSClass> for &'static str {
fn from(rt: DNSClass) -> &'static str {
match rt {
DNSClass::IN => "IN",
DNSClass::CH => "CH",
DNSClass::HS => "HS",
DNSClass::NONE => "NONE",
DNSClass::ANY => "ANY",
DNSClass::OPT(_) => "OPT"
}
}
}
impl From<DNSClass> for u16 {
fn from(rt: DNSClass) -> Self {
match rt {
DNSClass::IN => 1,
DNSClass::CH => 3,
DNSClass::HS => 4,
DNSClass::NONE => 254,
DNSClass::ANY => 255,
DNSClass::OPT(version) => version,
}
}
}
impl PartialOrd<DNSClass> for DNSClass {
fn partial_cmp(&self, other: &DNSClass) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Ord for DNSClass {
fn cmp(&self, other: &Self) -> Ordering {
u16::from(*self).cmp(&u16::from(*other))
}
}
#[test]
fn test_order() {
let ordered = vec![DNSClass::IN, DNSClass::CH, DNSClass::HS, DNSClass::NONE, DNSClass::ANY];
let mut unordered = vec![DNSClass::NONE, DNSClass::HS, DNSClass::CH, DNSClass::IN, DNSClass::ANY];
unordered.sort();
assert_eq!(unordered, ordered);
}