wrong index in X3BytesField.addfield()

[nbareil@…]

SNAP was behaving strangely :

>>> linehexdump(SNAP(OUI=0xcc))
00 00 00 00 00  .....
>>> linehexdump(SNAP(OUI=0x00cc00))
00 00 CC 00 00  .....
>>> linehexdump(SNAP(OUI=0xaabbcc))
00 AA BB 00 00  .....

There was a bad index in 3BytesField in addfield(), this patch fixes it.

--- scapy.py.orig       2006-07-13 11:28:32.000000000 +0200
+++ scapy.py    2006-07-13 11:28:49.000000000 +0200
@@ -3761,7 +3761,7 @@
     def __init__(self, name, default):
         Field.__init__(self, name, default, "I")
     def addfield(self, pkt, s, val):
-        return s+struct.pack(self.fmt, self.i2m(pkt,val))[:3]
+        return s+struct.pack(self.fmt, self.i2m(pkt,val))[1:4]
     def getfield(self, pkt, s):
         return  s[3:], self.m2i(pkt, struct.unpack(self.fmt, "\x00"+s[:3])[0])

[pbi]

applied.