kernel_cmdline: Implement Deref for Cmdline

Signed-off-by: John Eckersberg <[email protected]>

Author: jeckersb

crates/kernel_cmdline/src/bytes.rs

@@ -30,6 +30,14 @@ impl<'a, T: AsRef<[u8]> + ?Sized> From<&'a T> for Cmdline<'a> {
     }
 }
 
+impl Deref for Cmdline<'_> {
+    type Target = [u8];
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
 impl From<Vec<u8>> for CmdlineOwned {
     /// Creates a new `Cmdline` from an owned `Vec<u8>`.
     fn from(input: Vec<u8>) -> Self {

crates/kernel_cmdline/src/utf8.rs

@@ -213,6 +213,16 @@ impl<'a> Cmdline<'a> {
     }
 }
 
+impl Deref for Cmdline<'_> {
+    type Target = str;
+
+    fn deref(&self) -> &Self::Target {
+        // SAFETY: We know this is valid UTF-8 since we only
+        // construct the underlying `bytes` from valid UTF-8
+        str::from_utf8(&self.0).expect("We only construct the underlying bytes from valid UTF-8")
+    }
+}
+
 impl<'a> AsRef<str> for Cmdline<'a> {
     fn as_ref(&self) -> &str {
         str::from_utf8(self.0.as_ref())