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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-04 12:47:55 +0000
commit2aadc03ef15cb5ca5cc2af8a7c08e070742f0ac4 (patch)
tree033cc839730fda84ff08db877037977be94e5e3a /vendor/der/src/header.rs
parentInitial commit. (diff)
downloadcargo-2aadc03ef15cb5ca5cc2af8a7c08e070742f0ac4.tar.xz
cargo-2aadc03ef15cb5ca5cc2af8a7c08e070742f0ac4.zip
Adding upstream version 0.70.1+ds1.upstream/0.70.1+ds1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'vendor/der/src/header.rs')
-rw-r--r--vendor/der/src/header.rs60
1 files changed, 60 insertions, 0 deletions
diff --git a/vendor/der/src/header.rs b/vendor/der/src/header.rs
new file mode 100644
index 0000000..ad30381
--- /dev/null
+++ b/vendor/der/src/header.rs
@@ -0,0 +1,60 @@
+//! ASN.1 DER headers.
+
+use crate::{Decode, DerOrd, Encode, ErrorKind, Length, Reader, Result, Tag, Writer};
+use core::cmp::Ordering;
+
+/// ASN.1 DER headers: tag + length component of TLV-encoded values
+#[derive(Copy, Clone, Debug, Eq, PartialEq)]
+pub struct Header {
+ /// Tag representing the type of the encoded value
+ pub tag: Tag,
+
+ /// Length of the encoded value
+ pub length: Length,
+}
+
+impl Header {
+ /// Create a new [`Header`] from a [`Tag`] and a specified length.
+ ///
+ /// Returns an error if the length exceeds the limits of [`Length`].
+ pub fn new(tag: Tag, length: impl TryInto<Length>) -> Result<Self> {
+ let length = length.try_into().map_err(|_| ErrorKind::Overflow)?;
+ Ok(Self { tag, length })
+ }
+}
+
+impl<'a> Decode<'a> for Header {
+ fn decode<R: Reader<'a>>(reader: &mut R) -> Result<Header> {
+ let tag = Tag::decode(reader)?;
+
+ let length = Length::decode(reader).map_err(|e| {
+ if e.kind() == ErrorKind::Overlength {
+ ErrorKind::Length { tag }.into()
+ } else {
+ e
+ }
+ })?;
+
+ Ok(Self { tag, length })
+ }
+}
+
+impl Encode for Header {
+ fn encoded_len(&self) -> Result<Length> {
+ self.tag.encoded_len()? + self.length.encoded_len()?
+ }
+
+ fn encode(&self, writer: &mut impl Writer) -> Result<()> {
+ self.tag.encode(writer)?;
+ self.length.encode(writer)
+ }
+}
+
+impl DerOrd for Header {
+ fn der_cmp(&self, other: &Self) -> Result<Ordering> {
+ match self.tag.der_cmp(&other.tag)? {
+ Ordering::Equal => self.length.der_cmp(&other.length),
+ ordering => Ok(ordering),
+ }
+ }
+}