[Winpcap-users] TCP Checksum Calculator

[Jonathan Hunt]

I was just wondering whether anyone had implemented a simple TCP  
checksum-verifying function for a packet captured through WinPcap. I  
need to include one in a simple C-program which I'm writing, but I'd  
imagine that it's something which has been coded about 1000 times  
before, so I thought I'd see if anyone could kindly help me out -  
there's no point in reinventing the wheel!

Many thanks

Jonathan