init

2025-04-15 12:15:27 +02:00
commit 6572754e2a
1871 changed files with 329779 additions and 0 deletions
--- a/venv/lib/python3.11/site-packages/chafon_rfid/checksum.py
+++ b/venv/lib/python3.11/site-packages/chafon_rfid/checksum.py
@@ -0,0 +1,18 @@
+import sys
+
+PRESET_VALUE=0xFFFF
+POLYNOMIAL=0x8408
+
+def checksum(pucY):
+    uiCrcValue = PRESET_VALUE
+    for ucY in pucY:
+        uiCrcValue = uiCrcValue ^ ucY
+        for ucJ in range(8):
+            if uiCrcValue & 0x0001:
+                uiCrcValue = (uiCrcValue >> 1) ^ POLYNOMIAL;
+            else:
+                uiCrcValue = (uiCrcValue >> 1)
+    return uiCrcValue;
+
+if __name__ == '__main__':
+    print('%X' % (checksum(bytearray.fromhex(sys.argv[1])),))