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der: add new and derives to SequenceRef #1980

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der: add new and derives to SequenceRef #1980

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12 changes: 10 additions & 2 deletions der/src/asn1/sequence.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2,8 +2,8 @@
//! `SEQUENCE`s to Rust structs.

use crate::{
BytesRef, DecodeValue, EncodeValue, Error, FixedTag, Header, Length, Reader, Result, Tag,
Writer,
BytesRef, DecodeValue, EncodeValue, Error, ErrorKind, FixedTag, Header, Length, Reader, Result,
Tag, Writer,
};

#[cfg(feature = "alloc")]
Expand All @@ -28,12 +28,20 @@ impl<'a, T> Sequence<'a> for Box<T> where T: Sequence<'a> {}
/// DER-encoded `SEQUENCE`.
///
/// This is a zero-copy reference type which borrows from the input data.
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
pub struct SequenceRef<'a> {
/// Body of the `SEQUENCE`.
body: &'a BytesRef,
}

impl<'a> SequenceRef<'a> {
/// Create a new [`SequenceRef`] from the provided DER bytes.
pub fn new(slice: &'a [u8]) -> Result<Self> {
BytesRef::new(slice)
.map(|body| Self { body })
.map_err(|_| ErrorKind::Length { tag: Self::TAG }.into())
}

/// Borrow the inner byte slice.
pub fn as_bytes(&self) -> &'a [u8] {
self.body.as_slice()
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