/*
 * Copyright (C) 2012 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * $Id$
 */

#include "ipf.h"


void
fill6bits(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));
        }
}