From 608a8ad6112848b23589754e9f32bffc96b09e98 Mon Sep 17 00:00:00 2001
From: huysentruitw <wouter_huysentruit@hotmail.com>
Date: Wed, 9 Feb 2022 09:17:15 +0100
Subject: [PATCH] Fix bug in DataMatrix padding algorithm

---
 datamatrix/encoder.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/datamatrix/encoder.go b/datamatrix/encoder.go
index b8921dc..ea852e8 100644
--- a/datamatrix/encoder.go
+++ b/datamatrix/encoder.go
@@ -69,7 +69,12 @@ func addPadding(data []byte, toCount int) []byte {
 	}
 	for len(data) < toCount {
 		R := ((149 * (len(data) + 1)) % 253) + 1
-		data = append(data, byte((129+R)%254))
+		tmp := 129 + R;
+		if (tmp > 254) {
+			tmp = tmp - 254
+		}
+		   
+		data = append(data, byte(tmp))
 	}
 	return data
 }