lib/common/fill6bits.c

	fill6bits.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * Copyright (C) 1993-2001 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id: fill6bits.c,v 1.5 2002/03/27 15:09:57 darrenr Exp $
 */

#include "ipf.h"


void fill6bits(bits, msk)
int bits;
u_int *msk;
{
    if (bits == 0) {
        msk[0] = 0;
        msk[1] = 0;
        msk[2] = 0;
        msk[3] = 0;
        return;
    }

    msk[0] = 0xffffffff;
    msk[1] = 0xffffffff;
    msk[2] = 0xffffffff;
    msk[3] = 0xffffffff;

    if (bits == 128)
        return;
    if (bits > 96) {
        msk[3] = htonl(msk[3] << (128 - bits));
    } else if (bits > 64) {
        msk[3] = 0;
        msk[2] = htonl(msk[2] << (96 - bits));
    } else if (bits > 32) {
        msk[3] = 0;
        msk[2] = 0;
        msk[1] = htonl(msk[1] << (64 - bits));
    } else {
        msk[3] = 0;
        msk[2] = 0;
        msk[1] = 0;
        msk[0] = htonl(msk[0] << (32 - bits));
    }
}