process empty str

9 years ago · f5434bdbd0
1 changed files with 2 additions and 0 deletions
--- a/shadowsocks/common.py
+++ b/shadowsocks/common.py
@ -150,6 +150,8 @@ def pack_addr(address):
    return b'\x03' + chr(len(address)) + address

 def pre_parse_header(data):
+    if not data:
+        return None
    datatype = ord(data[0])
    if datatype == 0x80:
        if len(data) <= 2: