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// Copyright 2017-2018 int08h LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use error::Error;
/// An unsigned 32-bit value (key) that maps to a byte-string (value).
#[derive(Debug, PartialEq, Eq, PartialOrd, Hash, Clone)]
pub enum Tag {
// Enforcement of the "tags in strictly increasing order" rule is done using the
// little-endian encoding of the ASCII tag value; e.g. 'SIG\x00' is 0x00474953 and
// 'NONC' is 0x434e4f4e.
//
// Tags are written here in ascending order
SIG,
NONC,
DELE,
PATH,
RADI,
PUBK,
MIDP,
SREP,
MINT,
ROOT,
CERT,
MAXT,
INDX,
PAD,
}
impl Tag {
/// Translates a tag into its on-the-wire representation
pub fn wire_value(&self) -> &'static [u8] {
match *self {
Tag::CERT => b"CERT",
Tag::DELE => b"DELE",
Tag::INDX => b"INDX",
Tag::MAXT => b"MAXT",
Tag::MIDP => b"MIDP",
Tag::MINT => b"MINT",
Tag::NONC => b"NONC",
Tag::PAD => b"PAD\xff",
Tag::PATH => b"PATH",
Tag::PUBK => b"PUBK",
Tag::RADI => b"RADI",
Tag::ROOT => b"ROOT",
Tag::SIG => b"SIG\x00",
Tag::SREP => b"SREP",
}
}
/// Return the `Tag` corresponding to the on-the-wire representation in `bytes` or an
/// `Error::InvalidTag` if `bytes` do not correspond to a valid tag.
pub fn from_wire(bytes: &[u8]) -> Result<Self, Error> {
match bytes {
b"CERT" => Ok(Tag::CERT),
b"DELE" => Ok(Tag::DELE),
b"INDX" => Ok(Tag::INDX),
b"MAXT" => Ok(Tag::MAXT),
b"MIDP" => Ok(Tag::MIDP),
b"MINT" => Ok(Tag::MINT),
b"NONC" => Ok(Tag::NONC),
b"PAD\xff" => Ok(Tag::PAD),
b"PATH" => Ok(Tag::PATH),
b"PUBK" => Ok(Tag::PUBK),
b"RADI" => Ok(Tag::RADI),
b"ROOT" => Ok(Tag::ROOT),
b"SIG\x00" => Ok(Tag::SIG),
b"SREP" => Ok(Tag::SREP),
_ => Err(Error::InvalidTag(Box::from(bytes))),
}
}
}
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