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1c79356b
A
1/*
2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
d7e50217 6 * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b 7 *
d7e50217
A
8 * This file contains Original Code and/or Modifications of Original Code
9 * as defined in and that are subject to the Apple Public Source License
10 * Version 2.0 (the 'License'). You may not use this file except in
11 * compliance with the License. Please obtain a copy of the License at
12 * http://www.opensource.apple.com/apsl/ and read it before using this
13 * file.
14 *
15 * The Original Code and all software distributed under the License are
16 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b
A
17 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
18 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
d7e50217
A
19 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
20 * Please see the License for the specific language governing rights and
21 * limitations under the License.
1c79356b
A
22 *
23 * @APPLE_LICENSE_HEADER_END@
24 */
25/*
26 * ppp_deflate.c - interface the zlib procedures for Deflate compression
27 * and decompression (as used by gzip) to the PPP code.
28 * This version is for use with mbufs on BSD-derived systems.
29 *
30 * Copyright (c) 1994 The Australian National University.
31 * All rights reserved.
32 *
33 * Permission to use, copy, modify, and distribute this software and its
34 * documentation is hereby granted, provided that the above copyright
35 * notice appears in all copies. This software is provided without any
36 * warranty, express or implied. The Australian National University
37 * makes no representations about the suitability of this software for
38 * any purpose.
39 *
40 * IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
41 * PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
42 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
43 * THE AUSTRALIAN NATIONAL UNIVERSITY HAS BEEN ADVISED OF THE POSSIBILITY
44 * OF SUCH DAMAGE.
45 *
46 * THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
47 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
48 * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
49 * ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
50 * OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
51 * OR MODIFICATIONS.
52 */
53
54#include <sys/param.h>
55#include <sys/systm.h>
56#include <sys/malloc.h>
57#include <sys/mbuf.h>
58#include <net/ppp_defs.h>
59#include <net/zlib.h>
60
61#define PACKETPTR struct mbuf *
62#include <net/ppp_comp.h>
63
64#if DO_DEFLATE
65
66#define DEFLATE_DEBUG 1
67
68/*
69 * State for a Deflate (de)compressor.
70 */
71struct deflate_state {
72 int seqno;
73 int w_size;
74 int unit;
75 int hdrlen;
76 int mru;
77 int debug;
78 z_stream strm;
79 struct compstat stats;
80};
81
82#define DEFLATE_OVHD 2 /* Deflate overhead/packet */
83
84static void *z_alloc __P((void *, u_int items, u_int size));
85static void z_free __P((void *, void *ptr));
86static void *z_comp_alloc __P((u_char *options, int opt_len));
87static void *z_decomp_alloc __P((u_char *options, int opt_len));
88static void z_comp_free __P((void *state));
89static void z_decomp_free __P((void *state));
90static int z_comp_init __P((void *state, u_char *options, int opt_len,
91 int unit, int hdrlen, int debug));
92static int z_decomp_init __P((void *state, u_char *options, int opt_len,
93 int unit, int hdrlen, int mru, int debug));
94static int z_compress __P((void *state, struct mbuf **mret,
95 struct mbuf *mp, int slen, int maxolen));
96static void z_incomp __P((void *state, struct mbuf *dmsg));
97static int z_decompress __P((void *state, struct mbuf *cmp,
98 struct mbuf **dmpp));
99static void z_comp_reset __P((void *state));
100static void z_decomp_reset __P((void *state));
101static void z_comp_stats __P((void *state, struct compstat *stats));
102
103/*
104 * Procedures exported to if_ppp.c.
105 */
106struct compressor ppp_deflate = {
107 CI_DEFLATE, /* compress_proto */
108 z_comp_alloc, /* comp_alloc */
109 z_comp_free, /* comp_free */
110 z_comp_init, /* comp_init */
111 z_comp_reset, /* comp_reset */
112 z_compress, /* compress */
113 z_comp_stats, /* comp_stat */
114 z_decomp_alloc, /* decomp_alloc */
115 z_decomp_free, /* decomp_free */
116 z_decomp_init, /* decomp_init */
117 z_decomp_reset, /* decomp_reset */
118 z_decompress, /* decompress */
119 z_incomp, /* incomp */
120 z_comp_stats, /* decomp_stat */
121};
122
123struct compressor ppp_deflate_draft = {
124 CI_DEFLATE_DRAFT, /* compress_proto */
125 z_comp_alloc, /* comp_alloc */
126 z_comp_free, /* comp_free */
127 z_comp_init, /* comp_init */
128 z_comp_reset, /* comp_reset */
129 z_compress, /* compress */
130 z_comp_stats, /* comp_stat */
131 z_decomp_alloc, /* decomp_alloc */
132 z_decomp_free, /* decomp_free */
133 z_decomp_init, /* decomp_init */
134 z_decomp_reset, /* decomp_reset */
135 z_decompress, /* decompress */
136 z_incomp, /* incomp */
137 z_comp_stats, /* decomp_stat */
138};
139
140/*
141 * Space allocation and freeing routines for use by zlib routines.
142 */
143void *
144z_alloc(notused, items, size)
145 void *notused;
146 u_int items, size;
147{
148 void *ptr;
149
150 MALLOC(ptr, void *, items * size, M_DEVBUF, M_NOWAIT);
151 return ptr;
152}
153
154void
155z_free(notused, ptr)
156 void *notused;
157 void *ptr;
158{
159 FREE(ptr, M_DEVBUF);
160}
161
162/*
163 * Allocate space for a compressor.
164 */
165static void *
166z_comp_alloc(options, opt_len)
167 u_char *options;
168 int opt_len;
169{
170 struct deflate_state *state;
171 int w_size;
172
173 if (opt_len != CILEN_DEFLATE
174 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
175 || options[1] != CILEN_DEFLATE
176 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
177 || options[3] != DEFLATE_CHK_SEQUENCE)
178 return NULL;
179 w_size = DEFLATE_SIZE(options[2]);
180 if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
181 return NULL;
182
183 MALLOC(state, struct deflate_state *, sizeof(struct deflate_state),
184 M_DEVBUF, M_NOWAIT);
185 if (state == NULL)
186 return NULL;
187
188 state->strm.next_in = NULL;
189 state->strm.zalloc = z_alloc;
190 state->strm.zfree = z_free;
191 if (deflateInit2(&state->strm, Z_DEFAULT_COMPRESSION, DEFLATE_METHOD_VAL,
192 -w_size, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
193 FREE(state, M_DEVBUF);
194 return NULL;
195 }
196
197 state->w_size = w_size;
198 bzero(&state->stats, sizeof(state->stats));
199 return (void *) state;
200}
201
202static void
203z_comp_free(arg)
204 void *arg;
205{
206 struct deflate_state *state = (struct deflate_state *) arg;
207
208 deflateEnd(&state->strm);
209 FREE(state, M_DEVBUF);
210}
211
212static int
213z_comp_init(arg, options, opt_len, unit, hdrlen, debug)
214 void *arg;
215 u_char *options;
216 int opt_len, unit, hdrlen, debug;
217{
218 struct deflate_state *state = (struct deflate_state *) arg;
219
220 if (opt_len < CILEN_DEFLATE
221 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
222 || options[1] != CILEN_DEFLATE
223 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
224 || DEFLATE_SIZE(options[2]) != state->w_size
225 || options[3] != DEFLATE_CHK_SEQUENCE)
226 return 0;
227
228 state->seqno = 0;
229 state->unit = unit;
230 state->hdrlen = hdrlen;
231 state->debug = debug;
232
233 deflateReset(&state->strm);
234
235 return 1;
236}
237
238static void
239z_comp_reset(arg)
240 void *arg;
241{
242 struct deflate_state *state = (struct deflate_state *) arg;
243
244 state->seqno = 0;
245 deflateReset(&state->strm);
246}
247
248int
249z_compress(arg, mret, mp, orig_len, maxolen)
250 void *arg;
251 struct mbuf **mret; /* compressed packet (out) */
252 struct mbuf *mp; /* uncompressed packet (in) */
253 int orig_len, maxolen;
254{
255 struct deflate_state *state = (struct deflate_state *) arg;
256 u_char *rptr, *wptr;
257 int proto, olen, wspace, r, flush;
258 struct mbuf *m;
259
260 /*
261 * Check that the protocol is in the range we handle.
262 */
263 rptr = mtod(mp, u_char *);
264 proto = PPP_PROTOCOL(rptr);
265 if (proto > 0x3fff || proto == 0xfd || proto == 0xfb) {
266 *mret = NULL;
267 return orig_len;
268 }
269
270 /* Allocate one mbuf initially. */
271 if (maxolen > orig_len)
272 maxolen = orig_len;
273 MGET(m, M_DONTWAIT, MT_DATA);
274 *mret = m;
275 if (m != NULL) {
276 m->m_len = 0;
277 if (maxolen + state->hdrlen > MLEN)
278 MCLGET(m, M_DONTWAIT);
279 wspace = M_TRAILINGSPACE(m);
280 if (state->hdrlen + PPP_HDRLEN + 2 < wspace) {
281 m->m_data += state->hdrlen;
282 wspace -= state->hdrlen;
283 }
284 wptr = mtod(m, u_char *);
285
286 /*
287 * Copy over the PPP header and store the 2-byte sequence number.
288 */
289 wptr[0] = PPP_ADDRESS(rptr);
290 wptr[1] = PPP_CONTROL(rptr);
291 wptr[2] = PPP_COMP >> 8;
292 wptr[3] = PPP_COMP;
293 wptr += PPP_HDRLEN;
294 wptr[0] = state->seqno >> 8;
295 wptr[1] = state->seqno;
296 wptr += 2;
297 state->strm.next_out = wptr;
298 state->strm.avail_out = wspace - (PPP_HDRLEN + 2);
299 } else {
300 state->strm.next_out = NULL;
301 state->strm.avail_out = 1000000;
302 wptr = NULL;
303 wspace = 0;
304 }
305 ++state->seqno;
306
307 rptr += (proto > 0xff)? 2: 3; /* skip 1st proto byte if 0 */
308 state->strm.next_in = rptr;
309 state->strm.avail_in = mtod(mp, u_char *) + mp->m_len - rptr;
310 mp = mp->m_next;
311 flush = (mp == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
312 olen = 0;
313 for (;;) {
314 r = deflate(&state->strm, flush);
315 if (r != Z_OK) {
316 printf("z_compress: deflate returned %d (%s)\n",
317 r, (state->strm.msg? state->strm.msg: ""));
318 break;
319 }
320 if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
321 break; /* all done */
322 if (state->strm.avail_in == 0 && mp != NULL) {
323 state->strm.next_in = mtod(mp, u_char *);
324 state->strm.avail_in = mp->m_len;
325 mp = mp->m_next;
326 if (mp == NULL)
327 flush = Z_PACKET_FLUSH;
328 }
329 if (state->strm.avail_out == 0) {
330 if (m != NULL) {
331 m->m_len = wspace;
332 olen += wspace;
333 MGET(m->m_next, M_DONTWAIT, MT_DATA);
334 m = m->m_next;
335 if (m != NULL) {
336 m->m_len = 0;
337 if (maxolen - olen > MLEN)
338 MCLGET(m, M_DONTWAIT);
339 state->strm.next_out = mtod(m, u_char *);
340 state->strm.avail_out = wspace = M_TRAILINGSPACE(m);
341 }
342 }
343 if (m == NULL) {
344 state->strm.next_out = NULL;
345 state->strm.avail_out = 1000000;
346 }
347 }
348 }
349 if (m != NULL)
350 olen += (m->m_len = wspace - state->strm.avail_out);
351
352 /*
353 * See if we managed to reduce the size of the packet.
354 */
355 if (m != NULL && olen < orig_len) {
356 state->stats.comp_bytes += olen;
357 state->stats.comp_packets++;
358 } else {
359 if (*mret != NULL) {
360 m_freem(*mret);
361 *mret = NULL;
362 }
363 state->stats.inc_bytes += orig_len;
364 state->stats.inc_packets++;
365 olen = orig_len;
366 }
367 state->stats.unc_bytes += orig_len;
368 state->stats.unc_packets++;
369
370 return olen;
371}
372
373static void
374z_comp_stats(arg, stats)
375 void *arg;
376 struct compstat *stats;
377{
378 struct deflate_state *state = (struct deflate_state *) arg;
379 u_int out;
380
381 *stats = state->stats;
382 stats->ratio = stats->unc_bytes;
383 out = stats->comp_bytes + stats->inc_bytes;
384 if (stats->ratio <= 0x7ffffff)
385 stats->ratio <<= 8;
386 else
387 out >>= 8;
388 if (out != 0)
389 stats->ratio /= out;
390}
391
392/*
393 * Allocate space for a decompressor.
394 */
395static void *
396z_decomp_alloc(options, opt_len)
397 u_char *options;
398 int opt_len;
399{
400 struct deflate_state *state;
401 int w_size;
402
403 if (opt_len != CILEN_DEFLATE
404 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
405 || options[1] != CILEN_DEFLATE
406 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
407 || options[3] != DEFLATE_CHK_SEQUENCE)
408 return NULL;
409 w_size = DEFLATE_SIZE(options[2]);
410 if (w_size < DEFLATE_MIN_SIZE || w_size > DEFLATE_MAX_SIZE)
411 return NULL;
412
413 MALLOC(state, struct deflate_state *, sizeof(struct deflate_state),
414 M_DEVBUF, M_NOWAIT);
415 if (state == NULL)
416 return NULL;
417
418 state->strm.next_out = NULL;
419 state->strm.zalloc = z_alloc;
420 state->strm.zfree = z_free;
421 if (inflateInit2(&state->strm, -w_size) != Z_OK) {
422 FREE(state, M_DEVBUF);
423 return NULL;
424 }
425
426 state->w_size = w_size;
427 bzero(&state->stats, sizeof(state->stats));
428 return (void *) state;
429}
430
431static void
432z_decomp_free(arg)
433 void *arg;
434{
435 struct deflate_state *state = (struct deflate_state *) arg;
436
437 inflateEnd(&state->strm);
438 FREE(state, M_DEVBUF);
439}
440
441static int
442z_decomp_init(arg, options, opt_len, unit, hdrlen, mru, debug)
443 void *arg;
444 u_char *options;
445 int opt_len, unit, hdrlen, mru, debug;
446{
447 struct deflate_state *state = (struct deflate_state *) arg;
448
449 if (opt_len < CILEN_DEFLATE
450 || (options[0] != CI_DEFLATE && options[0] != CI_DEFLATE_DRAFT)
451 || options[1] != CILEN_DEFLATE
452 || DEFLATE_METHOD(options[2]) != DEFLATE_METHOD_VAL
453 || DEFLATE_SIZE(options[2]) != state->w_size
454 || options[3] != DEFLATE_CHK_SEQUENCE)
455 return 0;
456
457 state->seqno = 0;
458 state->unit = unit;
459 state->hdrlen = hdrlen;
460 state->debug = debug;
461 state->mru = mru;
462
463 inflateReset(&state->strm);
464
465 return 1;
466}
467
468static void
469z_decomp_reset(arg)
470 void *arg;
471{
472 struct deflate_state *state = (struct deflate_state *) arg;
473
474 state->seqno = 0;
475 inflateReset(&state->strm);
476}
477
478/*
479 * Decompress a Deflate-compressed packet.
480 *
481 * Because of patent problems, we return DECOMP_ERROR for errors
482 * found by inspecting the input data and for system problems, but
483 * DECOMP_FATALERROR for any errors which could possibly be said to
484 * be being detected "after" decompression. For DECOMP_ERROR,
485 * we can issue a CCP reset-request; for DECOMP_FATALERROR, we may be
486 * infringing a patent of Motorola's if we do, so we take CCP down
487 * instead.
488 *
489 * Given that the frame has the correct sequence number and a good FCS,
490 * errors such as invalid codes in the input most likely indicate a
491 * bug, so we return DECOMP_FATALERROR for them in order to turn off
492 * compression, even though they are detected by inspecting the input.
493 */
494int
495z_decompress(arg, mi, mop)
496 void *arg;
497 struct mbuf *mi, **mop;
498{
499 struct deflate_state *state = (struct deflate_state *) arg;
500 struct mbuf *mo, *mo_head;
501 u_char *rptr, *wptr;
502 int rlen, olen, ospace;
503 int seq, i, flush, r, decode_proto;
504 u_char hdr[PPP_HDRLEN + DEFLATE_OVHD];
505
506 *mop = NULL;
507 rptr = mtod(mi, u_char *);
508 rlen = mi->m_len;
509 for (i = 0; i < PPP_HDRLEN + DEFLATE_OVHD; ++i) {
510 while (rlen <= 0) {
511 mi = mi->m_next;
512 if (mi == NULL)
513 return DECOMP_ERROR;
514 rptr = mtod(mi, u_char *);
515 rlen = mi->m_len;
516 }
517 hdr[i] = *rptr++;
518 --rlen;
519 }
520
521 /* Check the sequence number. */
522 seq = (hdr[PPP_HDRLEN] << 8) + hdr[PPP_HDRLEN+1];
523 if (seq != state->seqno) {
524 if (state->debug)
525 printf("z_decompress%d: bad seq # %d, expected %d\n",
526 state->unit, seq, state->seqno);
527 return DECOMP_ERROR;
528 }
529 ++state->seqno;
530
531 /* Allocate an output mbuf. */
532 MGETHDR(mo, M_DONTWAIT, MT_DATA);
533 if (mo == NULL)
534 return DECOMP_ERROR;
535 mo_head = mo;
536 mo->m_len = 0;
537 mo->m_next = NULL;
538 MCLGET(mo, M_DONTWAIT);
539 ospace = M_TRAILINGSPACE(mo);
540 if (state->hdrlen + PPP_HDRLEN < ospace) {
541 mo->m_data += state->hdrlen;
542 ospace -= state->hdrlen;
543 }
544
545 /*
546 * Fill in the first part of the PPP header. The protocol field
547 * comes from the decompressed data.
548 */
549 wptr = mtod(mo, u_char *);
550 wptr[0] = PPP_ADDRESS(hdr);
551 wptr[1] = PPP_CONTROL(hdr);
552 wptr[2] = 0;
553
554 /*
555 * Set up to call inflate. We set avail_out to 1 initially so we can
556 * look at the first byte of the output and decide whether we have
557 * a 1-byte or 2-byte protocol field.
558 */
559 state->strm.next_in = rptr;
560 state->strm.avail_in = rlen;
561 mi = mi->m_next;
562 flush = (mi == NULL)? Z_PACKET_FLUSH: Z_NO_FLUSH;
563 rlen += PPP_HDRLEN + DEFLATE_OVHD;
564 state->strm.next_out = wptr + 3;
565 state->strm.avail_out = 1;
566 decode_proto = 1;
567 olen = PPP_HDRLEN;
568
569 /*
570 * Call inflate, supplying more input or output as needed.
571 */
572 for (;;) {
573 r = inflate(&state->strm, flush);
574 if (r != Z_OK) {
575#if !DEFLATE_DEBUG
576 if (state->debug)
577#endif
578 printf("z_decompress%d: inflate returned %d (%s)\n",
579 state->unit, r, (state->strm.msg? state->strm.msg: ""));
580 m_freem(mo_head);
581 return DECOMP_FATALERROR;
582 }
583 if (flush != Z_NO_FLUSH && state->strm.avail_out != 0)
584 break; /* all done */
585 if (state->strm.avail_in == 0 && mi != NULL) {
586 state->strm.next_in = mtod(mi, u_char *);
587 state->strm.avail_in = mi->m_len;
588 rlen += mi->m_len;
589 mi = mi->m_next;
590 if (mi == NULL)
591 flush = Z_PACKET_FLUSH;
592 }
593 if (state->strm.avail_out == 0) {
594 if (decode_proto) {
595 state->strm.avail_out = ospace - PPP_HDRLEN;
596 if ((wptr[3] & 1) == 0) {
597 /* 2-byte protocol field */
598 wptr[2] = wptr[3];
599 --state->strm.next_out;
600 ++state->strm.avail_out;
601 --olen;
602 }
603 decode_proto = 0;
604 } else {
605 mo->m_len = ospace;
606 olen += ospace;
607 MGET(mo->m_next, M_DONTWAIT, MT_DATA);
608 mo = mo->m_next;
609 if (mo == NULL) {
610 m_freem(mo_head);
611 return DECOMP_ERROR;
612 }
613 MCLGET(mo, M_DONTWAIT);
614 state->strm.next_out = mtod(mo, u_char *);
615 state->strm.avail_out = ospace = M_TRAILINGSPACE(mo);
616 }
617 }
618 }
619 if (decode_proto) {
620 m_freem(mo_head);
621 return DECOMP_ERROR;
622 }
623 olen += (mo->m_len = ospace - state->strm.avail_out);
624#if DEFLATE_DEBUG
625 if (state->debug && olen > state->mru + PPP_HDRLEN)
626 printf("ppp_deflate%d: exceeded mru (%d > %d)\n",
627 state->unit, olen, state->mru + PPP_HDRLEN);
628#endif
629
630 state->stats.unc_bytes += olen;
631 state->stats.unc_packets++;
632 state->stats.comp_bytes += rlen;
633 state->stats.comp_packets++;
634
635 *mop = mo_head;
636 return DECOMP_OK;
637}
638
639/*
640 * Incompressible data has arrived - add it to the history.
641 */
642static void
643z_incomp(arg, mi)
644 void *arg;
645 struct mbuf *mi;
646{
647 struct deflate_state *state = (struct deflate_state *) arg;
648 u_char *rptr;
649 int rlen, proto, r;
650
651 /*
652 * Check that the protocol is one we handle.
653 */
654 rptr = mtod(mi, u_char *);
655 proto = PPP_PROTOCOL(rptr);
656 if (proto > 0x3fff || proto == 0xfd || proto == 0xfb)
657 return;
658
659 ++state->seqno;
660
661 /*
662 * Iterate through the mbufs, adding the characters in them
663 * to the decompressor's history. For the first mbuf, we start
664 * at the either the 1st or 2nd byte of the protocol field,
665 * depending on whether the protocol value is compressible.
666 */
667 rlen = mi->m_len;
668 state->strm.next_in = rptr + 3;
669 state->strm.avail_in = rlen - 3;
670 if (proto > 0xff) {
671 --state->strm.next_in;
672 ++state->strm.avail_in;
673 }
674 for (;;) {
675 r = inflateIncomp(&state->strm);
676 if (r != Z_OK) {
677 /* gak! */
678#if !DEFLATE_DEBUG
679 if (state->debug)
680#endif
681 printf("z_incomp%d: inflateIncomp returned %d (%s)\n",
682 state->unit, r, (state->strm.msg? state->strm.msg: ""));
683 return;
684 }
685 mi = mi->m_next;
686 if (mi == NULL)
687 break;
688 state->strm.next_in = mtod(mi, u_char *);
689 state->strm.avail_in = mi->m_len;
690 rlen += mi->m_len;
691 }
692
693 /*
694 * Update stats.
695 */
696 state->stats.inc_bytes += rlen;
697 state->stats.inc_packets++;
698 state->stats.unc_bytes += rlen;
699 state->stats.unc_packets++;
700}
701
702#endif /* DO_DEFLATE */