From e893ad24ee9f9fa553ae67812b523bcc9a26e0e2 Mon Sep 17 00:00:00 2001
From: ExtReMLapin <3909752+ExtReMLapin@users.noreply.github.com>
Date: Sun, 10 May 2020 22:01:42 +0200
Subject: [PATCH] Fixed sum crash when file size is a mult of 16384

Crash happened when file is mult of 16384, which means last block size is zero and it crashed because of data[-1]
---
 grmn/chksum.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/grmn/chksum.py b/grmn/chksum.py
index c0de702..56f09f9 100644
--- a/grmn/chksum.py
+++ b/grmn/chksum.py
@@ -15,7 +15,8 @@ class ChkSum:
         with open(filename, "rb") as f:
             while True:
                 block = f.read(blocksize)
-                self.add(block)
+                 if len(block) != 0:
+                    self.add(block)
                 if print_progress:
                     print(".", end="", flush=True)
                 if len(block) < blocksize: