also print percentage different

src/bin/bytediff.rs

@@ -147,6 +147,8 @@ fn main() -> Result<()> {
 
     let mut diff_state = DiffState::Same;
     let mut region_start: usize = 0;
+    let mut differing_chunks = 0;
+    let mut total_chunks = 0;
 
     for (i, (rva, rvb)) in
         ZipLonger::new(Chunks::new(a_bytes, 16), Chunks::new(b_bytes, 16)).enumerate()
@@ -196,6 +198,10 @@ fn main() -> Result<()> {
             }
         }
         diff_state = new_diff_state;
+        if diff_state != DiffState::Same {
+            differing_chunks += 1;
+        }
+        total_chunks += 1;
     }
 
     match diff_state {
@@ -214,5 +220,7 @@ fn main() -> Result<()> {
         }
     }
 
+    println!("{}/{} chunks differ ({:.2}%)", differing_chunks, total_chunks, 100.0 * (differing_chunks as f32) / (total_chunks as f32));
+
     Ok(())
 }