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-rw-r--r--usr.sbin/ppp/pred.c345
1 files changed, 0 insertions, 345 deletions
diff --git a/usr.sbin/ppp/pred.c b/usr.sbin/ppp/pred.c
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index 43d5d94..0000000
--- a/usr.sbin/ppp/pred.c
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@@ -1,345 +0,0 @@
-/*-
- * Copyright (c) 1997 Brian Somers <brian@Awfulhak.org>
- * Ian Donaldson <iand@labtam.labtam.oz.au>
- * Carsten Bormann <cabo@cs.tu-berlin.de>
- * Dave Rand <dlr@bungi.com>/<dave_rand@novell.com>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD$
- */
-
-#include <sys/types.h>
-
-#include <stdlib.h>
-#include <string.h>
-#include <termios.h>
-
-#include "defs.h"
-#include "layer.h"
-#include "mbuf.h"
-#include "log.h"
-#include "timer.h"
-#include "fsm.h"
-#include "lqr.h"
-#include "hdlc.h"
-#include "lcp.h"
-#include "ccp.h"
-#include "throughput.h"
-#include "link.h"
-#include "pred.h"
-
-/* The following hash code is the heart of the algorithm:
- * It builds a sliding hash sum of the previous 3-and-a-bit characters
- * which will be used to index the guess table.
- * A better hash function would result in additional compression,
- * at the expense of time.
- */
-#define HASH(state, x) state->hash = (state->hash << 4) ^ (x)
-#define GUESS_TABLE_SIZE 65536
-
-struct pred1_state {
- u_short hash;
- u_char dict[GUESS_TABLE_SIZE];
-};
-
-static int
-compress(struct pred1_state *state, u_char *source, u_char *dest, int len)
-{
- int i, bitmask;
- unsigned char *flagdest, flags, *orgdest;
-
- orgdest = dest;
- while (len) {
- flagdest = dest++;
- flags = 0; /* All guess wrong initially */
- for (bitmask = 1, i = 0; i < 8 && len; i++, bitmask <<= 1) {
- if (state->dict[state->hash] == *source) {
- flags |= bitmask; /* Guess was right - don't output */
- } else {
- state->dict[state->hash] = *source;
- *dest++ = *source; /* Guess wrong, output char */
- }
- HASH(state, *source++);
- len--;
- }
- *flagdest = flags;
- }
- return (dest - orgdest);
-}
-
-static void
-SyncTable(struct pred1_state *state, u_char *source, u_char *dest, int len)
-{
- while (len--) {
- *dest++ = state->dict[state->hash] = *source;
- HASH(state, *source++);
- }
-}
-
-static int
-decompress(struct pred1_state *state, u_char *source, u_char *dest, int len)
-{
- int i, bitmask;
- unsigned char flags, *orgdest;
-
- orgdest = dest;
- while (len) {
- flags = *source++;
- len--;
- for (i = 0, bitmask = 1; i < 8; i++, bitmask <<= 1) {
- if (flags & bitmask) {
- *dest = state->dict[state->hash]; /* Guess correct */
- } else {
- if (!len)
- break; /* we seem to be really done -- cabo */
- state->dict[state->hash] = *source; /* Guess wrong */
- *dest = *source++; /* Read from source */
- len--;
- }
- HASH(state, *dest++);
- }
- }
- return (dest - orgdest);
-}
-
-static void
-Pred1Term(void *v)
-{
- struct pred1_state *state = (struct pred1_state *)v;
- free(state);
-}
-
-static void
-Pred1ResetInput(void *v)
-{
- struct pred1_state *state = (struct pred1_state *)v;
- state->hash = 0;
- memset(state->dict, '\0', sizeof state->dict);
- log_Printf(LogCCP, "Predictor1: Input channel reset\n");
-}
-
-static int
-Pred1ResetOutput(void *v)
-{
- struct pred1_state *state = (struct pred1_state *)v;
- state->hash = 0;
- memset(state->dict, '\0', sizeof state->dict);
- log_Printf(LogCCP, "Predictor1: Output channel reset\n");
-
- return 1; /* Ask FSM to ACK */
-}
-
-static void *
-Pred1InitInput(struct bundle *bundle __unused, struct fsm_opt *o __unused)
-{
- struct pred1_state *state;
- state = (struct pred1_state *)malloc(sizeof(struct pred1_state));
- if (state != NULL)
- Pred1ResetInput(state);
- return state;
-}
-
-static void *
-Pred1InitOutput(struct bundle *bundle __unused, struct fsm_opt *o __unused)
-{
- struct pred1_state *state;
- state = (struct pred1_state *)malloc(sizeof(struct pred1_state));
- if (state != NULL)
- Pred1ResetOutput(state);
- return state;
-}
-
-static struct mbuf *
-Pred1Output(void *v, struct ccp *ccp, struct link *l __unused,
- int pri __unused, u_short *proto, struct mbuf *bp)
-{
- struct pred1_state *state = (struct pred1_state *)v;
- struct mbuf *mwp;
- u_char *cp, *wp, *hp;
- int orglen, len;
- u_char bufp[MAX_MTU + 2];
- u_short fcs;
-
- orglen = m_length(bp) + 2; /* add count of proto */
- mwp = m_get((orglen + 2) / 8 * 9 + 12, MB_CCPOUT);
- hp = wp = MBUF_CTOP(mwp);
- cp = bufp;
- *wp++ = *cp++ = orglen >> 8;
- *wp++ = *cp++ = orglen & 0377;
- *cp++ = *proto >> 8;
- *cp++ = *proto & 0377;
- mbuf_Read(bp, cp, orglen - 2);
- fcs = hdlc_Fcs(bufp, 2 + orglen);
- fcs = ~fcs;
-
- len = compress(state, bufp + 2, wp, orglen);
- log_Printf(LogDEBUG, "Pred1Output: orglen (%d) --> len (%d)\n", orglen, len);
- ccp->uncompout += orglen;
- if (len < orglen) {
- *hp |= 0x80;
- wp += len;
- ccp->compout += len;
- } else {
- memcpy(wp, bufp + 2, orglen);
- wp += orglen;
- ccp->compout += orglen;
- }
-
- *wp++ = fcs & 0377;
- *wp++ = fcs >> 8;
- mwp->m_len = wp - MBUF_CTOP(mwp);
- *proto = ccp_Proto(ccp);
- return mwp;
-}
-
-static struct mbuf *
-Pred1Input(void *v, struct ccp *ccp, u_short *proto, struct mbuf *bp)
-{
- struct pred1_state *state = (struct pred1_state *)v;
- u_char *cp, *pp;
- int len, olen, len1;
- struct mbuf *wp;
- u_char *bufp;
- u_short fcs;
-
- wp = m_get(MAX_MRU + 2, MB_CCPIN);
- cp = MBUF_CTOP(bp);
- olen = m_length(bp);
- pp = bufp = MBUF_CTOP(wp);
- *pp++ = *cp & 0177;
- len = *cp++ << 8;
- *pp++ = *cp;
- len += *cp++;
- ccp->uncompin += len & 0x7fff;
- if (len & 0x8000) {
- len1 = decompress(state, cp, pp, olen - 4);
- ccp->compin += olen;
- len &= 0x7fff;
- if (len != len1) { /* Error is detected. Send reset request */
- log_Printf(LogCCP, "Pred1: Length error (got %d, not %d)\n", len1, len);
- fsm_Reopen(&ccp->fsm);
- m_freem(bp);
- m_freem(wp);
- return NULL;
- }
- cp += olen - 4;
- pp += len1;
- } else if (len + 4 != olen) {
- log_Printf(LogCCP, "Pred1: Length error (got %d, not %d)\n", len + 4, olen);
- fsm_Reopen(&ccp->fsm);
- m_freem(wp);
- m_freem(bp);
- return NULL;
- } else {
- ccp->compin += len;
- SyncTable(state, cp, pp, len);
- cp += len;
- pp += len;
- }
- *pp++ = *cp++; /* CRC */
- *pp++ = *cp++;
- fcs = hdlc_Fcs(bufp, wp->m_len = pp - bufp);
- if (fcs == GOODFCS) {
- wp->m_offset += 2; /* skip length */
- wp->m_len -= 4; /* skip length & CRC */
- pp = MBUF_CTOP(wp);
- *proto = *pp++;
- if (*proto & 1) {
- wp->m_offset++;
- wp->m_len--;
- } else {
- wp->m_offset += 2;
- wp->m_len -= 2;
- *proto = (*proto << 8) | *pp++;
- }
- m_freem(bp);
- return wp;
- } else {
- const char *pre = *MBUF_CTOP(bp) & 0x80 ? "" : "un";
- log_Printf(LogDEBUG, "Pred1Input: fcs = 0x%04x (%scompressed), len = 0x%x,"
- " olen = 0x%x\n", fcs, pre, len, olen);
- log_Printf(LogCCP, "%s: Bad %scompressed CRC-16\n",
- ccp->fsm.link->name, pre);
- fsm_Reopen(&ccp->fsm);
- m_freem(wp);
- }
- m_freem(bp);
- return NULL;
-}
-
-static void
-Pred1DictSetup(void *v __unused, struct ccp *ccp __unused,
- u_short proto __unused, struct mbuf *bp __unused)
-{
- /* Nothing to see here */
-}
-
-static const char *
-Pred1DispOpts(struct fsm_opt *o __unused)
-{
- return NULL;
-}
-
-static void
-Pred1InitOptsOutput(struct bundle *bundle __unused, struct fsm_opt *o,
- const struct ccp_config *cfg __unused)
-{
- o->hdr.len = 2;
-}
-
-static int
-Pred1SetOpts(struct bundle *bundle __unused, struct fsm_opt *o,
- const struct ccp_config *cfg __unused)
-{
- if (o->hdr.len != 2) {
- o->hdr.len = 2;
- return MODE_NAK;
- }
- return MODE_ACK;
-}
-
-const struct ccp_algorithm Pred1Algorithm = {
- TY_PRED1,
- CCP_NEG_PRED1,
- Pred1DispOpts,
- ccp_DefaultUsable,
- ccp_DefaultRequired,
- {
- Pred1SetOpts,
- Pred1InitInput,
- Pred1Term,
- Pred1ResetInput,
- Pred1Input,
- Pred1DictSetup
- },
- {
- 0,
- Pred1InitOptsOutput,
- Pred1SetOpts,
- Pred1InitOutput,
- Pred1Term,
- Pred1ResetOutput,
- Pred1Output
- },
-};
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