1 files changed, 162 insertions, 0 deletions
diff --git a/vendor/der/src/bytes_owned.rs b/vendor/der/src/bytes_owned.rs
new file mode 100644
index 0000000..b5e928e
--- /dev/null
+++ b/vendor/der/src/bytes_owned.rs
@@ -0,0 +1,162 @@
+//! Common handling for types backed by byte allocation with enforcement of a
+//! library-level length limitation i.e. `Length::max()`.
+
+use crate::{
+    referenced::OwnedToRef, BytesRef, DecodeValue, DerOrd, EncodeValue, Error, Header, Length,
+    Reader, Result, StrRef, Writer,
+};
+use alloc::{boxed::Box, vec::Vec};
+use core::cmp::Ordering;
+
+/// Byte slice newtype which respects the `Length::max()` limit.
+#[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
+pub(crate) struct BytesOwned {
+    /// Precomputed `Length` (avoids possible panicking conversions)
+    length: Length,
+
+    /// Inner value
+    inner: Box<[u8]>,
+}
+
+impl BytesOwned {
+    /// Create a new [`BytesOwned`], ensuring that the provided `slice` value
+    /// is shorter than `Length::max()`.
+    pub fn new(data: impl Into<Box<[u8]>>) -> Result<Self> {
+        let inner: Box<[u8]> = data.into();
+
+        Ok(Self {
+            length: Length::try_from(inner.len())?,
+            inner,
+        })
+    }
+
+    /// Borrow the inner byte slice
+    pub fn as_slice(&self) -> &[u8] {
+        &self.inner
+    }
+
+    /// Get the [`Length`] of this [`BytesRef`]
+    pub fn len(&self) -> Length {
+        self.length
+    }
+
+    /// Is this [`BytesOwned`] empty?
+    pub fn is_empty(&self) -> bool {
+        self.len() == Length::ZERO
+    }
+}
+
+impl AsRef<[u8]> for BytesOwned {
+    fn as_ref(&self) -> &[u8] {
+        self.as_slice()
+    }
+}
+
+impl<'a> DecodeValue<'a> for BytesOwned {
+    fn decode_value<R: Reader<'a>>(reader: &mut R, header: Header) -> Result<Self> {
+        reader.read_vec(header.length).and_then(Self::new)
+    }
+}
+
+impl EncodeValue for BytesOwned {
+    fn value_len(&self) -> Result<Length> {
+        Ok(self.length)
+    }
+
+    fn encode_value(&self, writer: &mut impl Writer) -> Result<()> {
+        writer.write(self.as_ref())
+    }
+}
+
+impl Default for BytesOwned {
+    fn default() -> Self {
+        Self {
+            length: Length::ZERO,
+            inner: Box::new([]),
+        }
+    }
+}
+
+impl DerOrd for BytesOwned {
+    fn der_cmp(&self, other: &Self) -> Result<Ordering> {
+        Ok(self.as_slice().cmp(other.as_slice()))
+    }
+}
+
+impl From<BytesOwned> for Box<[u8]> {
+    fn from(bytes: BytesOwned) -> Box<[u8]> {
+        bytes.inner
+    }
+}
+
+impl From<StrRef<'_>> for BytesOwned {
+    fn from(s: StrRef<'_>) -> BytesOwned {
+        let bytes = s.as_bytes();
+        debug_assert_eq!(bytes.len(), usize::try_from(s.length).expect("overflow"));
+
+        BytesOwned {
+            inner: Box::from(bytes),
+            length: s.length,
+        }
+    }
+}
+
+impl OwnedToRef for BytesOwned {
+    type Borrowed<'a> = BytesRef<'a>;
+    fn owned_to_ref(&self) -> Self::Borrowed<'_> {
+        BytesRef {
+            length: self.length,
+            inner: self.inner.as_ref(),
+        }
+    }
+}
+
+impl From<BytesRef<'_>> for BytesOwned {
+    fn from(s: BytesRef<'_>) -> BytesOwned {
+        BytesOwned {
+            length: s.length,
+            inner: Box::from(s.inner),
+        }
+    }
+}
+
+impl TryFrom<&[u8]> for BytesOwned {
+    type Error = Error;
+
+    fn try_from(bytes: &[u8]) -> Result<Self> {
+        Self::new(bytes)
+    }
+}
+
+impl TryFrom<Box<[u8]>> for BytesOwned {
+    type Error = Error;
+
+    fn try_from(bytes: Box<[u8]>) -> Result<Self> {
+        Self::new(bytes)
+    }
+}
+
+impl TryFrom<Vec<u8>> for BytesOwned {
+    type Error = Error;
+
+    fn try_from(bytes: Vec<u8>) -> Result<Self> {
+        Self::new(bytes)
+    }
+}
+
+// Implement by hand because the derive would create invalid values.
+// Make sure the length and the inner.len matches.
+#[cfg(feature = "arbitrary")]
+impl<'a> arbitrary::Arbitrary<'a> for BytesOwned {
+    fn arbitrary(u: &mut arbitrary::Unstructured<'a>) -> arbitrary::Result<Self> {
+        let length = u.arbitrary()?;
+        Ok(Self {
+            length,
+            inner: Box::from(u.bytes(u32::from(length) as usize)?),
+        })
+    }
+
+    fn size_hint(depth: usize) -> (usize, Option<usize>) {
+        arbitrary::size_hint::and(Length::size_hint(depth), (0, None))
+    }
+}