Initial commit

gcksum.py

@@ -0,0 +1,24 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from binascii import hexlify
+from struct import unpack
+import sys
+
+FILE = sys.argv[1]
+
+print("Opening {}".format(FILE))
+
+csum = 0
+
+with open(FILE, "rb") as f:
+    while True:
+        block = f.read(1024)
+        for c in block:
+            csum += c
+            csum &= 0xff
+        if len(block) < 1024:
+            print("End reached.")
+            break
+
+print("Sum of all bytes: {}".format(csum))