RealworldConnector.h File Reference

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

Go to the source code of this file.

Classes
class	RealworldConnector
	RealworldConnector is a pseudo interface that allows communcation with the real world through the TunOutScheduler. More...

Macros
#define	BUFFERZITE   mtu + 4

Functions
u_short	cksum (uint16_t *buf, int nbytes)
	helper funcition needed for computing checksums

Detailed Description

Author

Stephan Krause

Definition in file RealworldConnector.h.

Macro Definition Documentation

#define BUFFERZITE   mtu + 4

Definition at line 72 of file RealworldConnector.h.

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

Definition at line 39 of file RealworldConnector.h.

{
    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;
}