impl From<Box<[u8; _]>> for Bytes

src/bytes.rs

@@ -871,6 +871,36 @@ impl From<Box<[u8]>> for Bytes {
     }
 }
 
+impl<const N: usize> From<Box<[u8; N]>> for Bytes {
+    fn from(slice: Box<[u8; N]>) -> Self {
+        // Box<[u8]> doesn't contain a heap allocation for empty slices,
+        // so the pointer isn't aligned enough for the KIND_VEC stashing to
+        // work.
+        if slice.is_empty() {
+            return Bytes::new();
+        }
+
+        let ptr = Box::into_raw(slice) as *mut u8;
+
+        if ptr as usize & 0x1 == 0 {
+            let data = ptr_map(ptr, |addr| addr | KIND_VEC);
+            Bytes {
+                ptr,
+                len: N,
+                data: AtomicPtr::new(data.cast()),
+                vtable: &PROMOTABLE_EVEN_VTABLE,
+            }
+        } else {
+            Bytes {
+                ptr,
+                len: N,
+                data: AtomicPtr::new(ptr.cast()),
+                vtable: &PROMOTABLE_ODD_VTABLE,
+            }
+        }
+    }
+}
+
 impl From<String> for Bytes {
     fn from(s: String) -> Bytes {
         Bytes::from(s.into_bytes())