From 4f823fba78361c721c03af585150a293187549c5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Sommer?= <joerg@jo-so.de>
Date: Thu, 13 May 2021 17:12:33 +0200
Subject: [PATCH] Use saturating arithmetic on calculating row saving

The saturating arithmetic doesn't overflow, but stays at the maximum or
minimum. In this case it doesn't become negative, but zero, which
satisfies the condition below.

Closes #31
---
 src/main.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main.rs b/src/main.rs
index 9f276da..71f85e1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -229,7 +229,7 @@ fn main() {
     );
 
     if let Some(min) = min_saved_rows {
-        let saving = (original_summed_size - compressed_summed_size) as i32;
+        let saving = original_summed_size.saturating_sub(compressed_summed_size);
         if saving < min {
             println!(
                 "Only {} rows would be saved by this compression. Skipping output.",