parsing .pcap files

[Astan Chee]

Hi,
Im using pyflag to parse .pcap files. Pyflag displays the data part of 
the .pcap file in binary and I was wondering what this means. How do I 
decode the 'data' part of the packet without using external libraries? 
What does these non-alpha numerical information mean? Is there a 
(python) dictionary/documentation somewhere that I can use to parse this 
data?
Thanks again.
Cheers
Astan
PS: I've attached the .pcap file that Im using to test and the python 
file as well.

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