151 lines
3.6 KiB
C
151 lines
3.6 KiB
C
/* $NetBSD: get.c,v 1.2 1997/03/25 03:07:15 thorpej Exp $ */
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/*
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* Copyright (c) 1993-95 Mats O Jansson. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Mats O Jansson.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef LINT
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static char rcsid[] = "$NetBSD: get.c,v 1.2 1997/03/25 03:07:15 thorpej Exp $";
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#endif
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#include <sys/types.h>
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#include "common/mopdef.h"
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u_char
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mopGetChar(pkt, index)
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register u_char *pkt;
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register int *index;
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{
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u_char ret;
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ret = pkt[*index];
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*index = *index + 1;
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return(ret);
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}
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u_short
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mopGetShort(pkt, index)
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register u_char *pkt;
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register int *index;
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{
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u_short ret;
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ret = pkt[*index] + pkt[*index+1]*256;
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*index = *index + 2;
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return(ret);
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}
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u_long
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mopGetLong(pkt, index)
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register u_char *pkt;
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register int *index;
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{
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u_long ret;
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ret = pkt[*index] +
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pkt[*index+1]*0x100 +
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pkt[*index+2]*0x10000 +
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pkt[*index+3]*0x1000000;
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*index = *index + 4;
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return(ret);
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}
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void
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mopGetMulti(pkt, index, dest, size)
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register u_char *pkt,*dest;
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register int *index,size;
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{
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int i;
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for (i = 0; i < size; i++) {
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dest[i] = pkt[*index+i];
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}
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*index = *index + size;
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}
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int
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mopGetTrans(pkt, trans)
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u_char *pkt;
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int trans;
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{
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u_short *ptype;
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if (trans == 0) {
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ptype = (u_short *)(pkt+12);
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if (ntohs(*ptype) < 1600) {
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trans = TRANS_8023;
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} else {
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trans = TRANS_ETHER;
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}
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}
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return(trans);
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}
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void
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mopGetHeader(pkt, index, dst, src, proto, len, trans)
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u_char *pkt, **dst, **src;
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int *index, *len, trans;
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u_short *proto;
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{
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*dst = pkt;
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*src = pkt + 6;
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*index = *index + 12;
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switch(trans) {
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case TRANS_ETHER:
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*proto = (u_short)(pkt[*index]*256 + pkt[*index+1]);
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*index = *index + 2;
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*len = (int)(pkt[*index+1]*256 + pkt[*index]);
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*index = *index + 2;
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break;
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case TRANS_8023:
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*len = (int)(pkt[*index]*256 + pkt[*index+1]);
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*index = *index + 8;
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*proto = (u_short)(pkt[*index]*256 + pkt[*index+1]);
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*index = *index + 2;
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break;
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}
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}
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u_short
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mopGetLength(pkt, trans)
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u_char *pkt;
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int trans;
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{
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switch(trans) {
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case TRANS_ETHER:
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return(pkt[15]*256 + pkt[14]);
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break;
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case TRANS_8023:
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return(pkt[12]*256 + pkt[13]);
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break;
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}
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return(0);
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}
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