add compression ratio output

src/main.rs

@@ -43,7 +43,14 @@ where
     bitbuf.clear();
     let header = Scheme::encode(buf, bitbuf);
     let len_freq = Scheme::header_size(&header) + bitbuf.len().div_ceil(8);
-    println!("{name:>10}: {len_freq:>10}");
+
+    #[allow(clippy::cast_precision_loss)]
+    let compression_ratio = len_freq as f32 / buf.len() as f32;
+
+    println!(
+        "{name:>10}: {len_freq:>10} ({:5.1}%)",
+        compression_ratio * 100.
+    );
     if debug {
         eprintln!("{name} header: {header:#?}\n");
     }