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- Subject: Re: Convert userdata to hex string
- From: Peter Smith <psmith135@...>
- Date: Sun, 21 Feb 2010 13:41:50 +0200
Steve,
Thanks for your C extension, especially for it's win32 compiled version. It's almost working for me except that it apparently truncates the resulting string to 4 characters. My C skills are almost zero so I can't figure out where the problem is. Could you please take a look into it?
In my lua code I put some print statements for debugging and here is what I get:
=====================================
USERDATA LENGTH: 8706
CONVERTED LENGTH: 4
tshark: Lua: on packet 164 Error During execution of Listener Packet Callback:
[string "wsp.lua"]:7: bad argument #2 to 'format' (number expected, got no value)
... skipped packet summary ...
USERDATA LENGTH: 52044
CONVERTED LENGTH: 4
... skipped packet summary ...
USERDATA LENGTH: 786
CONVERTED LENGTH: 4
tshark: Lua: on packet 591 Error During execution of Listener Packet Callback happened 2 times:
[string "wsp.lua"]:7: bad argument #2 to 'format' (number expected, got no value)
... skipped packet summary ...
USERDATA LENGTH: 36097
CONVERTED LENGTH: 4
tshark: Lua: on packet 612 Error During execution of Listener Packet Callback happened 4 times:
[string "wsp.lua"]:7: bad argument #2 to 'format' (number expected, got no value)
... skipped packet summary ...
USERDATA LENGTH: 32302
CONVERTED LENGTH: 4
==================================
And here is the lua code itself:
=====================================
ud = require "userdata"
function BytesToString(bytes)
print ("USERDATA LENGTH: " .. bytes.len)
print ("CONVERTED LENGTH: " .. string.len(ud.as_string(bytes)))
s = {}
for i = 1, bytes.len do
s[i] = string.format("%02X ", string.byte(ud.as_string(bytes), i))
end
return concat(s)
end
wsp_extractor = Field.new("wsp")
tap = Listener.new(nil,"wsp")
function tap.packet(pinfo,tvb)
local wsp_pdu = wsp_extractor()
if wsp_pdu then
-- print(tostring(wsp_pdu))
-- print(ud.as_string(wsp_pdu))
print(BytesToString(wsp_pdu))
-- print ("PDU_LEN: " .. wsp_pdu.label)
end
end
=====================================
