1 files changed, 49 insertions, 0 deletions
diff --git a/update/adler32 b/update/adler32
new file mode 100755
index 0000000..187e34d
--- /dev/null
+++ b/update/adler32
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+
+"""
+    Project: TheManaWorld
+    Author: Bjorn Lindeijer, jak1
+    License: GPLv3
+    Description: Calculates adler32 checksums for all files passed as argument.
+    Credits: adler32.c 2006 Bjorn Lindeijer
+"""
+
+from zlib import adler32
+import sys
+import os
+
+def adler32sum(filepath):
+    BLOCKSIZE = 256*1024*1024
+    asum = 1
+    with open(filepath, 'rb') as f:
+        while (data := f.read(BLOCKSIZE)):
+            asum = adler32(data, asum)
+    return hex(asum)
+
+def cmd_help():
+        print(f"Usage: adler32.py <mode> <file>")
+        print(f" mode: 0 prints file & checksum")
+        print(f" mode: 1 prints only checksum")
+
+if __name__ == "__main__":
+    if len(sys.argv) >= 3:
+        try:
+            mode = int(sys.argv[1])
+            zfiles = sys.argv[2:]
+            for zfile in zfiles:
+                file_exists = os.path.exists(zfile)
+                if file_exists:
+                    if mode == 0:
+                        print(zfile + " " + adler32sum(zfile)[2:])
+                    elif mode == 1:
+                        print(adler32sum(zfile)[2:])
+                    else:
+                        cmd_help()
+                else:
+                    print("file not found!")
+                    exit(-1)
+        except ValueError:
+            print("mode needs to be an integer value!")
+            exit(-1)
+    else:
+        cmd_help()