[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/pppd/modules/deflate.c b/ap/app/pppd/modules/deflate.c
new file mode 100644
index 0000000..713dc12
--- /dev/null
+++ b/ap/app/pppd/modules/deflate.c
@@ -0,0 +1,772 @@
+/*
+ * ppp_deflate.c - interface the zlib procedures for Deflate compression
+ * and decompression (as used by gzip) to the PPP code.
+ * This version is for use with STREAMS under SunOS 4.x, Solaris 2,
+ * SVR4, OSF/1 and AIX 4.x.
+ *
+ * Copyright (c) 1994 Paul Mackerras. 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.
+ *
+ * 3. The name(s) of the authors of this software must not be used to
+ * endorse or promote products derived from this software without
+ * prior written permission.
+ *
+ * 4. Redistributions of any form whatsoever must retain the following
+ * acknowledgment:
+ * "This product includes software developed by Paul Mackerras
+ * <paulus@samba.org>".
+ *
+ * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
+ * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
+ * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * $Id: deflate.c,v 1.2 2007-06-08 04:02:37 gerg Exp $
+ */
+
+#ifdef AIX4
+#include <net/net_globals.h>
+#endif
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/stream.h>
+#include <net/ppp_defs.h>
+#include "ppp_mod.h"
+
+#define PACKETPTR mblk_t *
+#include <net/ppp-comp.h>
+
+#ifdef __osf__
+#include "zlib.h"
+#else
+#include "../common/zlib.h"
+#endif
+
+#ifdef SOL2
+#include <sys/sunddi.h>
+#endif
+
+#if DO_DEFLATE
+
+#define DEFLATE_DEBUG 1
+
+/*
+ * State for a Deflate (de)compressor.
+ */
+struct deflate_state {
+ int seqno;
+ int w_size;
+ int unit;
+ int hdrlen;
+ int mru;
+ int debug;
+ z_stream strm;
+ struct compstat stats;
+};
+
+#define DEFLATE_OVHD 2 /* Deflate overhead/packet */
+
+static void *z_alloc __P((void *, u_int items, u_int size));
+static void *z_alloc_init __P((void *, u_int items, u_int size));
+static void z_free __P((void *, void *ptr));
+static void *z_comp_alloc __P((u_char *options, int opt_len));
+static void *z_decomp_alloc __P((u_char *options, int opt_len));
+static void z_comp_free __P((void *state));
+static void z_decomp_free __P((void *state));
+static int z_comp_init __P((void *state, u_char *options, int opt_len,
+ int unit, int hdrlen, int debug));
+static int z_decomp_init __P((void *state, u_char *options, int opt_len,
+ int unit, int hdrlen, int mru, int debug));
+static int z_compress __P((void *state, mblk_t **mret,
+ mblk_t *mp, int slen, int maxolen));
+static void z_incomp __P((void *state, mblk_t *dmsg));
+static int z_decompress __P((void *state, mblk_t *cmp,
+ mblk_t **dmpp));
+static void z_comp_reset __P((void *state));
+static void z_decomp_reset __P((void *state));
+static void z_comp_stats __P((void *state, struct compstat *stats));
+
+/*
+ * Procedures exported to ppp_comp.c.
+ */
+struct compressor ppp_deflate = {
+ CI_DEFLATE, /* compress_proto */
+ z_comp_alloc, /* comp_alloc */
+ z_comp_free, /* comp_free */
+ z_comp_init, /* comp_init */
+ z_comp_reset, /* comp_reset */
+ z_compress, /* compress */
+ z_comp_stats, /* comp_stat */
+ z_decomp_alloc, /* decomp_alloc */
+ z_decomp_free, /* decomp_free */
+ z_decomp_init, /* decomp_init */
+ z_decomp_reset, /* decomp_reset */
+ z_decompress, /* decompress */
+ z_incomp, /* incomp */
+ z_comp_stats, /* decomp_stat */
+};
+
+struct compressor ppp_deflate_draft = {
+ CI_DEFLATE_DRAFT, /* compress_proto */
+ z_comp_alloc, /* comp_alloc */
+ z_comp_free, /* comp_free */
+ z_comp_init, /* comp_init */
+ z_comp_reset, /* comp_reset */
+ z_compress, /* compress */
+ z_comp_stats, /* comp_stat */
+ z_decomp_alloc, /* decomp_alloc */
+ z_decomp_free, /* decomp_free */
+ z_decomp_init, /* decomp_init */
+ z_decomp_reset, /* decomp_reset */
+ z_decompress, /* decompress */
+ z_incomp, /* incomp */
+ z_comp_stats, /* decomp_stat */
+};
+
+#define DECOMP_CHUNK 512
+
+/*
+ * Space allocation and freeing routines for use by zlib routines.
+ */
+struct zchunk {
+ u_int size;
+ u_int guard;
+};
+
+#define GUARD_MAGIC 0x77a6011a
+
+static void *
+z_alloc_init(notused, items, size)
+ void *notused;
+ u_int items, size;
+{
+ struct zchunk *z;
+
+ size = items * size + sizeof(struct zchunk);
+#ifdef __osf__
+ z = (struct zchunk *) ALLOC_SLEEP(size);
+#else
+ z = (struct zchunk *) ALLOC_NOSLEEP(size);
+#endif
+ z->size = size;
+ z->guard = GUARD_MAGIC;
+ return (void *) (z + 1);
+}
+
+static void *
+z_alloc(notused, items, size)
+ void *notused;
+ u_int items, size;
+{
+ struct zchunk *z;
+
+ size = items * size + sizeof(struct zchunk);
+ z = (struct zchunk *) ALLOC_NOSLEEP(size);
+ z->size = size;
+ z->guard = GUARD_MAGIC;
+ return (void *) (z + 1);
+}
+
+static void
+z_free(notused, ptr)
+ void *notused;
+ void *ptr;
+{
+ struct zchunk *z = ((struct zchunk *) ptr) - 1;
+
+ if (z->guard != GUARD_MAGIC) {
+ printf("ppp: z_free of corrupted chunk at %x (%x, %x)\n",
+ z, z->size, z->guard);
+ return;
+ }
+ FREE(z, z->size);
+}
+
+/*
+ * Allocate space for a compressor.
+ */
+static void *
+z_comp_alloc(options, opt_len)
+ u_char *options;
+ int opt_len;
+{
+ struct deflate_state *state;
+ int w_size;
+
+ if (opt_len != CILEN_DEFLATE
+ || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
+ || options[1] != CILEN_DEFLATE
+ || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
+ || options[3] != DEFLATE_CHK_SEQUENCE)
+ return NULL;
+ w_size = DEFLATE_SIZE(options[2]);
+ /*
+ * N.B. the 9 below should be DEFLATE_MIN_SIZE (8), but using
+ * 8 will cause kernel crashes because of a bug in zlib.
+ */
+ if (w_size < 9 || w_size > DEFLATE_MAX_SIZE)
+ return NULL;
+
+
+#ifdef __osf__
+ state = (struct deflate_state *) ALLOC_SLEEP(sizeof(*state));
+#else
+ state = (struct deflate_state *) ALLOC_NOSLEEP(sizeof(*state));
+#endif
+
+ if (state == NULL)
+ return NULL;
+
+ state->strm.next_in = NULL;
+ state->strm.zalloc = (alloc_func) z_alloc_init;
+ state->strm.zfree = (free_func) z_free;
+ if (deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, DEFLATE_METHOD_VAL,
+ -w_size, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
+ FREE(state, sizeof(*state));
+ return NULL;
+ }
+
+ state->strm.zalloc = (alloc_func) z_alloc;
+ state->w_size = w_size;
+ bzero(&state->stats, sizeof(state->stats));
+ return (void *) state;
+}
+
+static void
+z_comp_free(arg)
+ void *arg;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+
+ deflateEnd(&state->strm);
+ FREE(state, sizeof(*state));
+}
+
+static int
+z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
+ void *arg;
+ u_char *options;
+ int opt_len, unit, hdrlen, debug;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+
+ if (opt_len < CILEN_DEFLATE
+ || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
+ || options[1] != CILEN_DEFLATE
+ || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
+ || DEFLATE_SIZE(options[2]) != state->w_size
+ || options[3] != DEFLATE_CHK_SEQUENCE)
+ return 0;
+
+ state->seqno = 0;
+ state->unit = unit;
+ state->hdrlen = hdrlen;
+ state->debug = debug;
+
+ deflateReset(&state->strm);
+
+ return 1;
+}
+
+static void
+z_comp_reset(arg)
+ void *arg;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+
+ state->seqno = 0;
+ deflateReset(&state->strm);
+}
+
+static int
+z_compress(arg, mret, mp, orig_len, maxolen)
+ void *arg;
+ mblk_t **mret; /* compressed packet (out) */
+ mblk_t *mp; /* uncompressed packet (in) */
+ int orig_len, maxolen;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+ u_char *rptr, *wptr;
+ int proto, olen, wspace, r, flush;
+ mblk_t *m;
+
+ /*
+ * Check that the protocol is in the range we handle.
+ */
+ *mret = NULL;
+ rptr = mp->b_rptr;
+ if (rptr + PPP_HDRLEN > mp->b_wptr) {
+ if (!pullupmsg(mp, PPP_HDRLEN))
+ return 0;
+ rptr = mp->b_rptr;
+ }
+ proto = PPP_PROTOCOL(rptr);
+ if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
+ return orig_len;
+
+ /* Allocate one mblk initially. */
+ if (maxolen > orig_len)
+ maxolen = orig_len;
+ if (maxolen <= PPP_HDRLEN + 2) {
+ wspace = 0;
+ m = NULL;
+ } else {
+ wspace = maxolen + state->hdrlen;
+ if (wspace > 4096)
+ wspace = 4096;
+ m = allocb(wspace, BPRI_MED);
+ }
+ if (m != NULL) {
+ *mret = m;
+ if (state->hdrlen + PPP_HDRLEN + 2 < wspace) {
+ m->b_rptr += state->hdrlen;
+ m->b_wptr = m->b_rptr;
+ wspace -= state->hdrlen;
+ }
+ wptr = m->b_wptr;
+
+ /*
+ * Copy over the PPP header and store the 2-byte sequence number.
+ */
+ wptr[0] = PPP_ADDRESS(rptr);
+ wptr[1] = PPP_CONTROL(rptr);
+ wptr[2] = PPP_COMP >> 8;
+ wptr[3] = PPP_COMP;
+ wptr += PPP_HDRLEN;
+ wptr[0] = state->seqno >> 8;
+ wptr[1] = state->seqno;
+ wptr += 2;
+ state->strm.next_out = wptr;
+ state->strm.avail_out = wspace - (PPP_HDRLEN + 2);
+ } else {
+ state->strm.next_out = NULL;
+ state->strm.avail_out = 1000000;
+ }
+ ++state->seqno;
+
+ rptr += (proto > 0xff)? 2: 3; /* skip 1st proto byte if 0 */
+ state->strm.next_in = rptr;
+ state->strm.avail_in = mp->b_wptr - rptr;
+ mp = mp->b_cont;
+ flush = (mp == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
+ olen = 0;
+ for (;;) {
+ r = deflate(&state->strm, flush);
+ if (r != Z_OK) {
+ printf("z_compress: deflate returned %d (%s)\n",
+ r, (state->strm.msg? state->strm.msg: ""));
+ break;
+ }
+ if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
+ break; /* all done */
+ if (state->strm.avail_in == 0 && mp != NULL) {
+ state->strm.next_in = mp->b_rptr;
+ state->strm.avail_in = mp->b_wptr - mp->b_rptr;
+ mp = mp->b_cont;
+ if (mp == NULL)
+ flush = Z_PACKET_FLUSH;
+ }
+ if (state->strm.avail_out == 0) {
+ if (m != NULL) {
+ m->b_wptr += wspace;
+ olen += wspace;
+ wspace = maxolen - olen;
+ if (wspace <= 0) {
+ wspace = 0;
+ m->b_cont = NULL;
+ } else {
+ if (wspace < 32)
+ wspace = 32;
+ else if (wspace > 4096)
+ wspace = 4096;
+ m->b_cont = allocb(wspace, BPRI_MED);
+ }
+ m = m->b_cont;
+ if (m != NULL) {
+ state->strm.next_out = m->b_wptr;
+ state->strm.avail_out = wspace;
+ }
+ }
+ if (m == NULL) {
+ state->strm.next_out = NULL;
+ state->strm.avail_out = 1000000;
+ }
+ }
+ }
+ if (m != NULL) {
+ m->b_wptr += wspace - state->strm.avail_out;
+ olen += wspace - state->strm.avail_out;
+ }
+
+ /*
+ * See if we managed to reduce the size of the packet.
+ */
+ if (olen < orig_len && m != NULL) {
+ state->stats.comp_bytes += olen;
+ state->stats.comp_packets++;
+ } else {
+ if (*mret != NULL) {
+ freemsg(*mret);
+ *mret = NULL;
+ }
+ state->stats.inc_bytes += orig_len;
+ state->stats.inc_packets++;
+ olen = orig_len;
+ }
+ state->stats.unc_bytes += orig_len;
+ state->stats.unc_packets++;
+
+ return olen;
+}
+
+static void
+z_comp_stats(arg, stats)
+ void *arg;
+ struct compstat *stats;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+ u_int out;
+
+ *stats = state->stats;
+ stats->ratio = stats->unc_bytes;
+ out = stats->comp_bytes + stats->unc_bytes;
+ if (stats->ratio <= 0x7ffffff)
+ stats->ratio <<= 8;
+ else
+ out >>= 8;
+ if (out != 0)
+ stats->ratio /= out;
+}
+
+/*
+ * Allocate space for a decompressor.
+ */
+static void *
+z_decomp_alloc(options, opt_len)
+ u_char *options;
+ int opt_len;
+{
+ struct deflate_state *state;
+ int w_size;
+
+ if (opt_len != CILEN_DEFLATE
+ || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
+ || options[1] != CILEN_DEFLATE
+ || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
+ || options[3] != DEFLATE_CHK_SEQUENCE)
+ return NULL;
+ w_size = DEFLATE_SIZE(options[2]);
+ /*
+ * N.B. the 9 below should be DEFLATE_MIN_SIZE (8), but using
+ * 8 will cause kernel crashes because of a bug in zlib.
+ */
+ if (w_size < 9 || w_size > DEFLATE_MAX_SIZE)
+ return NULL;
+
+#ifdef __osf__
+ state = (struct deflate_state *) ALLOC_SLEEP(sizeof(*state));
+#else
+ state = (struct deflate_state *) ALLOC_NOSLEEP(sizeof(*state));
+#endif
+ if (state == NULL)
+ return NULL;
+
+ state->strm.next_out = NULL;
+ state->strm.zalloc = (alloc_func) z_alloc_init;
+ state->strm.zfree = (free_func) z_free;
+ if (inflateInit2(&state->strm, -w_size) != Z_OK) {
+ FREE(state, sizeof(*state));
+ return NULL;
+ }
+
+ state->strm.zalloc = (alloc_func) z_alloc;
+ state->w_size = w_size;
+ bzero(&state->stats, sizeof(state->stats));
+ return (void *) state;
+}
+
+static void
+z_decomp_free(arg)
+ void *arg;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+
+ inflateEnd(&state->strm);
+ FREE(state, sizeof(*state));
+}
+
+static int
+z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
+ void *arg;
+ u_char *options;
+ int opt_len, unit, hdrlen, mru, debug;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+
+ if (opt_len < CILEN_DEFLATE
+ || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
+ || options[1] != CILEN_DEFLATE
+ || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
+ || DEFLATE_SIZE(options[2]) != state->w_size
+ || options[3] != DEFLATE_CHK_SEQUENCE)
+ return 0;
+
+ state->seqno = 0;
+ state->unit = unit;
+ state->hdrlen = hdrlen;
+ state->debug = debug;
+ state->mru = mru;
+
+ inflateReset(&state->strm);
+
+ return 1;
+}
+
+static void
+z_decomp_reset(arg)
+ void *arg;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+
+ state->seqno = 0;
+ inflateReset(&state->strm);
+}
+
+/*
+ * Decompress a Deflate-compressed packet.
+ *
+ * Because of patent problems, we return DECOMP_ERROR for errors
+ * found by inspecting the input data and for system problems, but
+ * DECOMP_FATALERROR for any errors which could possibly be said to
+ * be being detected "after" decompression. For DECOMP_ERROR,
+ * we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be
+ * infringing a patent of Motorola's if we do, so we take CCP down
+ * instead.
+ *
+ * Given that the frame has the correct sequence number and a good FCS,
+ * errors such as invalid codes in the input most likely indicate a
+ * bug, so we return DECOMP_FATALERROR for them in order to turn off
+ * compression, even though they are detected by inspecting the input.
+ */
+static int
+z_decompress(arg, mi, mop)
+ void *arg;
+ mblk_t *mi, **mop;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+ mblk_t *mo, *mo_head;
+ u_char *rptr, *wptr;
+ int rlen, olen, ospace;
+ int seq, i, flush, r, decode_proto;
+ u_char hdr[PPP_HDRLEN + DEFLATE_OVHD];
+
+ *mop = NULL;
+ rptr = mi->b_rptr;
+ for (i = 0; i < PPP_HDRLEN + DEFLATE_OVHD; ++i) {
+ while (rptr >= mi->b_wptr) {
+ mi = mi->b_cont;
+ if (mi == NULL)
+ return DECOMP_ERROR;
+ rptr = mi->b_rptr;
+ }
+ hdr[i] = *rptr++;
+ }
+
+ /* Check the sequence number. */
+ seq = (hdr[PPP_HDRLEN] << 8) + hdr[PPP_HDRLEN+1];
+ if (seq != state->seqno) {
+#if !DEFLATE_DEBUG
+ if (state->debug)
+#endif
+ printf("z_decompress%d: bad seq # %d, expected %d\n",
+ state->unit, seq, state->seqno);
+ return DECOMP_ERROR;
+ }
+ ++state->seqno;
+
+ /* Allocate an output message block. */
+ mo = allocb(DECOMP_CHUNK + state->hdrlen, BPRI_MED);
+ if (mo == NULL)
+ return DECOMP_ERROR;
+ mo_head = mo;
+ mo->b_cont = NULL;
+ mo->b_rptr += state->hdrlen;
+ mo->b_wptr = wptr = mo->b_rptr;
+ ospace = DECOMP_CHUNK;
+ olen = 0;
+
+ /*
+ * Fill in the first part of the PPP header. The protocol field
+ * comes from the decompressed data.
+ */
+ wptr[0] = PPP_ADDRESS(hdr);
+ wptr[1] = PPP_CONTROL(hdr);
+ wptr[2] = 0;
+
+ /*
+ * Set up to call inflate. We set avail_out to 1 initially so we can
+ * look at the first byte of the output and decide whether we have
+ * a 1-byte or 2-byte protocol field.
+ */
+ state->strm.next_in = rptr;
+ state->strm.avail_in = mi->b_wptr - rptr;
+ mi = mi->b_cont;
+ flush = (mi == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
+ rlen = state->strm.avail_in + PPP_HDRLEN + DEFLATE_OVHD;
+ state->strm.next_out = wptr + 3;
+ state->strm.avail_out = 1;
+ decode_proto = 1;
+
+ /*
+ * Call inflate, supplying more input or output as needed.
+ */
+ for (;;) {
+ r = inflate(&state->strm, flush);
+ if (r != Z_OK) {
+#if !DEFLATE_DEBUG
+ if (state->debug)
+#endif
+ printf("z_decompress%d: inflate returned %d (%s)\n",
+ state->unit, r, (state->strm.msg? state->strm.msg: ""));
+ freemsg(mo_head);
+ return DECOMP_FATALERROR;
+ }
+ if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
+ break; /* all done */
+ if (state->strm.avail_in == 0 && mi != NULL) {
+ state->strm.next_in = mi->b_rptr;
+ state->strm.avail_in = mi->b_wptr - mi->b_rptr;
+ rlen += state->strm.avail_in;
+ mi = mi->b_cont;
+ if (mi == NULL)
+ flush = Z_PACKET_FLUSH;
+ }
+ if (state->strm.avail_out == 0) {
+ if (decode_proto) {
+ state->strm.avail_out = ospace - PPP_HDRLEN;
+ if ((wptr[3] & 1) == 0) {
+ /* 2-byte protocol field */
+ wptr[2] = wptr[3];
+ --state->strm.next_out;
+ ++state->strm.avail_out;
+ }
+ decode_proto = 0;
+ } else {
+ mo->b_wptr += ospace;
+ olen += ospace;
+ mo->b_cont = allocb(DECOMP_CHUNK, BPRI_MED);
+ mo = mo->b_cont;
+ if (mo == NULL) {
+ freemsg(mo_head);
+ return DECOMP_ERROR;
+ }
+ state->strm.next_out = mo->b_rptr;
+ state->strm.avail_out = ospace = DECOMP_CHUNK;
+ }
+ }
+ }
+ if (decode_proto) {
+ freemsg(mo_head);
+ return DECOMP_ERROR;
+ }
+ mo->b_wptr += ospace - state->strm.avail_out;
+ olen += ospace - state->strm.avail_out;
+
+#if DEFLATE_DEBUG
+ if (olen > state->mru + PPP_HDRLEN)
+ printf("ppp_deflate%d: exceeded mru (%d > %d)\n",
+ state->unit, olen, state->mru + PPP_HDRLEN);
+#endif
+
+ state->stats.unc_bytes += olen;
+ state->stats.unc_packets++;
+ state->stats.comp_bytes += rlen;
+ state->stats.comp_packets++;
+
+ *mop = mo_head;
+ return DECOMP_OK;
+}
+
+/*
+ * Incompressible data has arrived - add it to the history.
+ */
+static void
+z_incomp(arg, mi)
+ void *arg;
+ mblk_t *mi;
+{
+ struct deflate_state *state = (struct deflate_state *) arg;
+ u_char *rptr;
+ int rlen, proto, r;
+
+ /*
+ * Check that the protocol is one we handle.
+ */
+ rptr = mi->b_rptr;
+ if (rptr + PPP_HDRLEN > mi->b_wptr) {
+ if (!pullupmsg(mi, PPP_HDRLEN))
+ return;
+ rptr = mi->b_rptr;
+ }
+ proto = PPP_PROTOCOL(rptr);
+ if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
+ return;
+
+ ++state->seqno;
+
+ /*
+ * Iterate through the message blocks, adding the characters in them
+ * to the decompressor's history. For the first block, we start
+ * at the either the 1st or 2nd byte of the protocol field,
+ * depending on whether the protocol value is compressible.
+ */
+ rlen = mi->b_wptr - mi->b_rptr;
+ state->strm.next_in = rptr + 3;
+ state->strm.avail_in = rlen - 3;
+ if (proto > 0xff) {
+ --state->strm.next_in;
+ ++state->strm.avail_in;
+ }
+ for (;;) {
+ r = inflateIncomp(&state->strm);
+ if (r != Z_OK) {
+ /* gak! */
+#if !DEFLATE_DEBUG
+ if (state->debug)
+#endif
+ printf("z_incomp%d: inflateIncomp returned %d (%s)\n",
+ state->unit, r, (state->strm.msg? state->strm.msg: ""));
+ return;
+ }
+ mi = mi->b_cont;
+ if (mi == NULL)
+ break;
+ state->strm.next_in = mi->b_rptr;
+ state->strm.avail_in = mi->b_wptr - mi->b_rptr;
+ rlen += state->strm.avail_in;
+ }
+
+ /*
+ * Update stats.
+ */
+ state->stats.inc_bytes += rlen;
+ state->stats.inc_packets++;
+ state->stats.unc_bytes += rlen;
+ state->stats.unc_packets++;
+}
+
+#endif /* DO_DEFLATE */