Need to check file format

[abdesslem]

python captcp.py statistic file.txt

captcp 2010-2013 Hagen Paul Pfeifer and others (c)

http://research.protocollabs.com/captcp/

Traceback (most recent call last):
File "captcp.py", line 5301, in
sys.exit(captcp.run())
File "captcp.py", line 5269, in run
pcap_parser = PcapParser(self.pcap_file_path, self.pcap_filter)
File "captcp.py", line 534, in init
self.pc = dpkt.pcap.Reader(self.pcap_file)
File "/usr/lib/pymodules/python2.7/dpkt/pcap.py", line 97, in init
self.fh = FileHdr(buf)
File "/usr/lib/pymodules/python2.7/dpkt/dpkt.py", line 75, in __init
raise NeedData
dpkt.dpkt.NeedData

It can be checked with "FileHdr" class in the dpkt module.

[hgn]

Catching dpkt.dpkt.NeedData and printing a nice user info message? I am open to implement something else too - what did you expected?