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//! ASN.1 `OBJECT IDENTIFIER`
use crate::{
asn1::AnyRef, ord::OrdIsValueOrd, DecodeValue, EncodeValue, Error, FixedTag, Header, Length,
Reader, Result, Tag, Tagged, Writer,
};
use const_oid::ObjectIdentifier;
#[cfg(feature = "alloc")]
use super::Any;
impl<'a> DecodeValue<'a> for ObjectIdentifier {
fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> Result<Self> {
let mut buf = [0u8; ObjectIdentifier::MAX_SIZE];
let slice = buf
.get_mut(..header.length.try_into()?)
.ok_or_else(|| Self::TAG.length_error())?;
let actual_len = reader.read_into(slice)?.len();
debug_assert_eq!(actual_len, header.length.try_into()?);
Ok(Self::from_bytes(slice)?)
}
}
impl EncodeValue for ObjectIdentifier {
fn value_len(&self) -> Result<Length> {
Length::try_from(self.as_bytes().len())
}
fn encode_value(&self, writer: &mut impl Writer) -> Result<()> {
writer.write(self.as_bytes())
}
}
impl FixedTag for ObjectIdentifier {
const TAG: Tag = Tag::ObjectIdentifier;
}
impl OrdIsValueOrd for ObjectIdentifier {}
impl<'a> From<&'a ObjectIdentifier> for AnyRef<'a> {
fn from(oid: &'a ObjectIdentifier) -> AnyRef<'a> {
// Note: ensuring an infallible conversion is possible relies on the
// invariant that `const_oid::MAX_LEN <= Length::max()`.
//
// The `length()` test below ensures this is the case.
let value = oid
.as_bytes()
.try_into()
.expect("OID length invariant violated");
AnyRef::from_tag_and_value(Tag::ObjectIdentifier, value)
}
}
#[cfg(feature = "alloc")]
impl From<ObjectIdentifier> for Any {
fn from(oid: ObjectIdentifier) -> Any {
AnyRef::from(&oid).into()
}
}
impl TryFrom<AnyRef<'_>> for ObjectIdentifier {
type Error = Error;
fn try_from(any: AnyRef<'_>) -> Result<ObjectIdentifier> {
any.tag().assert_eq(Tag::ObjectIdentifier)?;
Ok(ObjectIdentifier::from_bytes(any.value())?)
}
}
#[cfg(test)]
mod tests {
use super::ObjectIdentifier;
use crate::{Decode, Encode, Length};
const EXAMPLE_OID: ObjectIdentifier = ObjectIdentifier::new_unwrap("1.2.840.113549");
const EXAMPLE_OID_BYTES: &[u8; 8] = &[0x06, 0x06, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d];
#[test]
fn decode() {
let oid = ObjectIdentifier::from_der(EXAMPLE_OID_BYTES).unwrap();
assert_eq!(EXAMPLE_OID, oid);
}
#[test]
fn encode() {
let mut buffer = [0u8; 8];
assert_eq!(
EXAMPLE_OID_BYTES,
EXAMPLE_OID.encode_to_slice(&mut buffer).unwrap()
);
}
#[test]
fn length() {
// Ensure an infallible `From` conversion to `Any` will never panic
assert!(ObjectIdentifier::MAX_SIZE <= Length::MAX.try_into().unwrap());
}
}
|
