/*?Asynchronous?HDLC?routines?*/
#include?“global.h“
#include?“ahdlc.h“
#include?“crc.h“
#include?“trace.h“	/******/

static?uint8?*putbyte（uint8?*uint8）;

void
init_hdlc（hpmaxsize）
struct?ahdlc?*hp;
int?maxsize;
{
	hp->escaped?=?0;
	hp->hunt?=?0;
	hp->inframe?=?NULL;
	hp->maxsize?=?maxsize;
	hp->fcs?=?FCS_START;
	hp->rxframes?=?0;
	hp->aborts?=?0;
	hp->toobigs?=?0;
	hp->crcerrs?=?0;
}

/*?Process?incoming?data.?Return?completed?packets?NULL?otherwise?*/
struct?mbuf?*
ahdlcrx（apc）
struct?ahdlc?*ap;	/*?HDLC?Receiver?control?block?*/
uint8?c;
{
	struct?mbuf?*bp;

	if（c?==?HDLC_ESC_ASYNC）{
		ap->escaped?=?1;
		return?NULL;
	}
	if（c?!=?HDLC_FLAG）{
		if（ap->hunt）
			return?NULL;?/*?Ignore?until?next?packet?*/
		/*?Normal?character?within?packet?*/
		if（ap->escaped）{
			c?^=?HDLC_ESC_COMPL;
			ap->escaped?=?0;
		}
		if（ap->inframe?==?NULL）
			ap->inframe?=?ambufw（ap->maxsize）;
		if（ap->inframe->cnt?==?ap->maxsize）{
			/*?frame?too?large?*/
			ap->toobigs++;
#ifdef	debug
			printf（“frame?TOO?LARGE?（>%u?bytes）\n“ap->maxsize）;
#endif
			free_p（&ap->inframe）;
			ap->inframe?=?NULL;
			ap->escaped?=?0;
			ap->fcs?=?FCS_START;
			ap->hunt?=?1;
			return?NULL;
		}
		/*?Store?character?update?FCS?*/
		ap->inframe->data[ap->inframe->cnt++]?=?c;
		ap->fcs?=?FCS（ap->fcsc）;
		return?NULL;
	}
	/*?We?get?here?only?if?the?character?is?a?flag?*/
	if（ap->escaped）{
		/*?ESC?FLAG?is?frame?abort?*/
		ap->aborts++;
#ifdef	debug
		printf（“AHDLC?ABORT?cnt?=?%u\n“ap->inframe->cnt）;
#endif
		ap->hunt?=?1;
		ap->escaped?=?0;
		free_p（&ap->inframe）;
		ap->inframe?=?NULL;
		ap->fcs?=?FCS_START;
		return?NULL;
	}
	if（ap->hunt）{
		/*?Found?flag?in?hunt?mode.?Reset?for?new?frame?*/
		ap->hunt?=?0;
		return?NULL;
	}
	if（ap->inframe?==?NULL）{
		/*?Padding?flags?ignore?*/
		return?NULL;
	}
	if（ap->fcs?!=?FCS_FINAL）{
		/*?CRC?error?*/
		ap->crcerrs++;
#ifdef	debug
		printf（“AHDLC?CRC?ERROR?cnt?=?%u\n“ap->inframe->cnt）;
		hex_dump（stdout&ap->inframe）;
#endif
		free_p（&ap->inframe）;
		ap->inframe?=?NULL;
		ap->fcs?=?FCS_START;
		return?NULL;
	}
	if（ap->inframe->cnt?		/*?Runt?frame?*/
		ap->runts++;
#ifdef	debug
		printf（“AHDLC?RUNT?cnt?=?%u\n“ap->inframe->cnt）;
#endif
		free_p（&ap->inframe）;
		ap->inframe?=?NULL;
		ap->fcs?=?FCS_START;
		return?NULL;
	}
	/*?Normal?end-of-frame?*/
	ap->rxframes++;
	bp?=?ap->inframe;
	ap->inframe?=?NULL;
	ap->fcs?=?FCS_START;
	bp->cnt?-=?2;
#ifdef	debug
	printf（“Normal?AHDLC?receive?len?%u\n“bp->cnt）;
#endif
	return?bp;
}
/*?Encode?a?packet?in?asynchronous?HDLC?for?transmission?*/
struct?mbuf?*
ahdlctx（bp）
struct?mbuf?*bp;
{
	struct?mbuf?*obp;
	uint8?*cp;
	int?c;
	uint16?fcs;

	fcs?=?FCS_START;
	obp?=?ambufw（5+2*len_p（bp））;	/*?Allocate?worst-case?*/
	cp?=?obp->data;
	while（（c?=?PULLCHAR（&bp））?!=?-1）{
		fcs?=?FCS（fcsc）;
		cp?=?putbyte（cpc）;
	}
	free_p（&bp）;	/*?Shouldn‘t?be?necessary?*/
	fcs?^=?0x

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件???????24616??2001-08-01?15:31??TCP_IP\config.c
?????文件????????3352??1995-11-17?08:59??TCP_IP\ahdlc.c
?????文件???????13028??2001-08-01?15:34??TCP_IP\alloc.c
?????文件?????????738??2001-08-01?15:34??TCP_IP\arcdump.c
?????文件????????2337??2001-08-01?15:34??TCP_IP\arcnet.c
?????文件????????4907??2001-08-01?15:34??TCP_IP\arpcmd.c
?????文件????????1770??2001-08-01?15:34??TCP_IP\arpdump.c
?????文件????????3958??2001-08-01?15:34??TCP_IP\asy.c
?????文件?????????492??1995-11-17?08:59??TCP_IP\aud.c
?????文件???????12286??2001-08-01?15:33??TCP_IP\ax25cmd.c
?????文件????????3964??2001-08-01?15:33??TCP_IP\ax25dump.c
?????文件????????2293??2001-08-01?15:33??TCP_IP\ax25mail.c
?????文件????????5345??2001-08-01?15:33??TCP_IP\ax25subr.c
?????文件???????17030??2001-08-01?15:24??TCP_IP\lapb.c
?????文件????????4658??2001-08-01?15:33??TCP_IP\axheard.c
?????文件???????22075??2001-08-01?15:33??TCP_IP\bmutil.c
?????文件???????10636??2001-08-01?15:26??TCP_IP\hop.c
?????文件???????15767??2001-08-01?15:32??TCP_IP\bootpcmd.c
?????文件????????6665??2001-08-01?15:20??TCP_IP\ping.c
?????文件???????29335??2001-08-01?15:31??TCP_IP\bootpdip.c
?????文件????????7004??2001-08-01?15:31??TCP_IP\cmdparse.c
?????文件????????6376??2001-08-01?15:11??TCP_IP\udp.c
?????文件????????2913??1995-11-17?09:00??TCP_IP\crc.c
?????文件????????1272??1995-11-17?09:00??TCP_IP\devparam.c
?????文件????????8348??2001-08-01?15:31??TCP_IP\dirutil.c
?????文件???????20390??2001-08-01?15:30??TCP_IP\display.c
?????文件????????9743??2001-08-01?15:30??TCP_IP\dma.c
?????文件???????41251??2001-08-01?15:30??TCP_IP\domain.c
?????文件????????6541??2001-08-01?15:30??TCP_IP\domhdr.c
?????文件????????7838??2001-08-01?15:30??TCP_IP\dos.c
?????文件???????11011??1995-11-18?08:07??TCP_IP\axsock.c
............此處省略237個文件信息