From bddaf9aec6bec393d9e35c78789103449249201e Mon Sep 17 00:00:00 2001
From: Xavier Olive <1360812+xoolive@users.noreply.github.com>
Date: Tue, 31 Dec 2019 19:15:25 +0900
Subject: [PATCH] compatibility with bytes (#57)

---
 pyModeS/decoder/common.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pyModeS/decoder/common.py b/pyModeS/decoder/common.py
index 8e52b91..17f55c6 100644
--- a/pyModeS/decoder/common.py
+++ b/pyModeS/decoder/common.py
@@ -63,8 +63,10 @@ def crc(msg, encode=False):
     # the CRC generator
     G = [int("11111111", 2), int("11111010", 2), int("00000100", 2), int("10000000", 2)]
 
-    if encode:
+    if encode and isinstance(msg, str):
         msg = msg[:-6] + "000000"
+    elif encode:
+        msg = msg[:-6] + b"000000"
 
     msgbin = hex2bin(msg)
     msgbin_split = wrap(msgbin, 8)