make check_null_bytes less golfy

Author: nagisa

src/util.rs

@@ -14,8 +14,15 @@ pub(crate) fn ensure_compatible_types<T, E>() -> Result<(), Error> {
 /// If any `b'\0'` at positions other than the last byte are found, an error is returned. Otherwise
 /// `true` will be returned only if the last byte is `b'\0'`.
 pub(crate) fn check_null_bytes(data: &[u8]) -> Result<bool, Error> {
-    let Some((last, remainder)) = data.split_last() else { return Ok(false) };
-    (!remainder.contains(&0)).then_some(*last == 0).ok_or(Error::InteriorZeroElements)
+    if let [rest @ .., last] = data {
+        if rest.contains(&0) {
+            Err(Error::InteriorZeroElements)
+        } else {
+            Ok(*last == 0)
+        }
+    } else {
+        Ok(false)
+    }
 }
 
 /// This function copies the slice into a vec and appends an element to its end.