use crate::prelude::*;
use alloc::vec::Vec;
pub use bytes::Bytes as OctetString;
#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct FixedOctetString<const N: usize>([u8; N]);
impl<const N: usize> FixedOctetString<N> {
pub fn new(value: [u8; N]) -> Self {
Self(value)
}
}
impl<const N: usize> From<[u8; N]> for FixedOctetString<N> {
fn from(value: [u8; N]) -> Self {
Self::new(value)
}
}
impl<const N: usize> TryFrom<Vec<u8>> for FixedOctetString<N> {
type Error = <[u8; N] as TryFrom<Vec<u8>>>::Error;
fn try_from(value: Vec<u8>) -> Result<Self, Self::Error> {
value.try_into().map(Self)
}
}
impl<const N: usize> TryFrom<&[u8]> for FixedOctetString<N> {
type Error = <[u8; N] as TryFrom<&'static [u8]>>::Error;
fn try_from(value: &[u8]) -> Result<Self, Self::Error> {
value.try_into().map(Self)
}
}
impl<const N: usize> TryFrom<OctetString> for FixedOctetString<N> {
type Error = <[u8; N] as TryFrom<&'static [u8]>>::Error;
fn try_from(value: OctetString) -> Result<Self, Self::Error> {
(&*value).try_into().map(Self)
}
}
impl<const N: usize> core::ops::Deref for FixedOctetString<N> {
type Target = [u8; N];
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<const N: usize> core::ops::DerefMut for FixedOctetString<N> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
impl<const N: usize> AsnType for FixedOctetString<N> {
const TAG: Tag = Tag::OCTET_STRING;
const CONSTRAINTS: Constraints<'static> = Constraints::new(&[Constraint::Size(
Extensible::new(constraints::Size::fixed(N)),
)]);
}
impl<const N: usize> Decode for FixedOctetString<N> {
fn decode_with_tag_and_constraints<D: Decoder>(
decoder: &mut D,
tag: Tag,
constraints: Constraints,
) -> Result<Self, D::Error> {
decoder
.decode_octet_string(tag, constraints)?
.try_into()
.map(Self)
.map_err(|vec| {
D::Error::from(crate::error::DecodeError::fixed_string_conversion_failed(
Tag::OCTET_STRING,
vec.len(),
N,
decoder.codec(),
))
})
}
}
impl<const N: usize> Encode for FixedOctetString<N> {
fn encode_with_tag_and_constraints<E: Encoder>(
&self,
encoder: &mut E,
tag: Tag,
constraints: Constraints,
) -> Result<(), E::Error> {
encoder
.encode_octet_string(tag, constraints, &self.0)
.map(drop)
}
}