RealworldConnector.h File Reference

#include <omnetpp.h>
#include "INETDefs.h"
#include "realtimescheduler.h"
#include "PacketParser.h"

Classes
class	RealworldConnector
	RealworldConnector is a pseudo interface that allows communcation with the real world through the TunOutScheduler. More...
Defines
#define	BUFFERZITE   mtu + 4
Functions
u_short	cksum (uint16_t *buf, int nbytes)
	helper funcition needed for computing checksums

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Define Documentation

#define BUFFERZITE   mtu + 4

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Function Documentation

u_short cksum	(	uint16_t *	buf,
		int	nbytes
	)			[inline]

helper funcition needed for computing checksums

Parameters:

	buf	The buffer containing the data to be checksummed
	nbytes	The length of the buffer in bytes

Returns:

the Checksum

{
    register unsigned long  sum;
    u_short                 oddbyte;

    sum = 0;
    while (nbytes > 1) {
        sum += *buf++;
        nbytes -= 2;
    }

    if (nbytes == 1) {
        oddbyte = 0;
        *((u_char *) &oddbyte) = *(u_char *) buf;
        sum += oddbyte;
    }

    sum = (sum >> 16) + (sum & 0xffff);
    sum += (sum >> 16);

    return ~sum;
}

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