You can get a text-ified version of TCP logs with standard tools:


    http://windump.polito.it/docs/manual.htm

        windump -r <filename> -x -n

    http://www.bogus.net/~codex/

        tcpdump -x -l


As the "tcpdump2ascii" example shows above, you can parse this readily.

Some example scripts which do exactly this:

    http://packetstorm.linuxsecurity.com/Exploit_Code_Archive/dumptcplink
    http://www.net.princeton.edu/software/etdc/
    http://www.nosneros.net/hso/code/snifob/download/snifob-current


On the other hand, a few people directly unpack the binary data.  Code that does this are:

    http://chaosreader.sourceforge.net/
    http://search.cpan.org/dist/Net-TcpDumpLog/