From c83bea4ae0234144135acc8e4b355070bc407cff Mon Sep 17 00:00:00 2001
From: Robin Stuart <rstuart114@gmail.com>
Date: Thu, 5 Jul 2018 21:27:26 +0100
Subject: [PATCH] Enforce maximum length of document type identifier

Fixes #113 reported by Daniel Gredler
---
 backend/gs1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backend/gs1.c b/backend/gs1.c
index d1de74bf..203fc787 100644
--- a/backend/gs1.c
+++ b/backend/gs1.c
@@ -449,7 +449,7 @@ int gs1_verify(struct zint_symbol *symbol, const unsigned char source[], const s
         }
         
         if (ai_value[i] == 253) { // GDTI
-            if ((data_length[i] < 14) || (data_length[i] > 31)) {
+            if ((data_length[i] < 14) || (data_length[i] > 30)) {
                 error_latch = 1;
             } else {
                 error_latch = 0;