1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
4  * Copyright (c) 1996 - 2001 Brian Somers <brian@Awfulhak.org>
5  *          based on work by Toshiharu OHNO <tony-o@iij.ad.jp>
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
61   memset(async->cfg.EscMap, '\0', sizeof async->cfg.EscMap);  in async_Init()
67   async->mode = MODE_HUNT;  in async_Setup()
68   async->length = 0;  in async_Setup()
69   async->my_accmap = async->his_accmap = 0xffffffff;  in async_Setup()
75   async->my_accmap = mymap;  in async_SetLinkParams()
76   async->his_accmap = hismap | mymap;  in async_SetLinkParams()
85   u_char *wp;  in async_Encode()  local
87   wp = *cp;  in async_Encode()
88   if ((c < 0x20 && (proto == PROTO_LCP || (async->his_accmap & (1 << c))))  in async_Encode()
90     *wp++ = HDLC_ESC;  in async_Encode()
93   if (async->cfg.EscMap[32] && async->cfg.EscMap[c >> 3] & (1 << (c & 7))) {  in async_Encode()
94     *wp++ = HDLC_ESC;  in async_Encode()
97   *wp++ = c;  in async_Encode()
98   *cp = wp;  in async_Encode()
107   struct mbuf *wp;  in async_LayerPush()  local
118   cp = p->async.xbuff;  in async_LayerPush()
119   ep = cp + HDLCSIZE - 10;  in async_LayerPush()
120   wp = bp;  in async_LayerPush()
122   while (wp) {  in async_LayerPush()
123     sp = MBUF_CTOP(wp);  in async_LayerPush()
124     for (cnt = wp->m_len; cnt > 0; cnt--) {  in async_LayerPush()
125       async_Encode(&p->async, &cp, *sp++, *proto);  in async_LayerPush()
131     wp = wp->m_next;  in async_LayerPush()
135   cnt = cp - p->async.xbuff;  in async_LayerPush()
138   memcpy(MBUF_CTOP(bp), p->async.xbuff, cnt);  in async_LayerPush()
139   bp->priv = cnt - oldcnt;  in async_LayerPush()
150   if ((async->mode & MODE_HUNT) && c != HDLC_SYN)  in async_Decode()
155     async->mode &= ~MODE_HUNT;  in async_Decode()
156     if (async->length) {		/* packet is ready. */  in async_Decode()
157       bp = m_get(async->length, MB_ASYNCIN);  in async_Decode()
158       mbuf_Write(bp, async->hbuff, async->length);  in async_Decode()
159       async->length = 0;  in async_Decode()
164     if (!(async->mode & MODE_ESC)) {  in async_Decode()
165       async->mode |= MODE_ESC;  in async_Decode()
170     if (async->length >= HDLCSIZE) {  in async_Decode()
173                  async->length);  in async_Decode()
174       async->length = 0;  in async_Decode()
175       async->mode = MODE_HUNT;  in async_Decode()
178     if (async->mode & MODE_ESC) {  in async_Decode()
180       async->mode &= ~MODE_ESC;  in async_Decode()
182     async->hbuff[async->length++] = c;  in async_Decode()
207     for (cnt = bp->m_len; cnt; cnt--) {  in async_LayerPull()
208       *last = async_Decode(&p->async, *ch++);  in async_LayerPull()
210         last = &(*last)->m_nextpkt;  in async_LayerPull()