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[rsync.git] / token.c
blob8a33588656c59acfd56695c2c358121063e05b18
1 /*
2 * Routines used by the file-transfer code.
3 *
4 * Copyright (C) 1996 Andrew Tridgell
5 * Copyright (C) 1996 Paul Mackerras
6 * Copyright (C) 2003-2020 Wayne Davison
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, visit the http://fsf.org website.
20 */
21
22 #include "rsync.h"
23 #include "itypes.h"
24 #include <zlib.h>
25 #ifdef SUPPORT_ZSTD
26 #include <zstd.h>
27 #endif
28 #ifdef SUPPORT_LZ4
29 #include <lz4.h>
30 #endif
31
32 extern int do_compression;
33 extern int protocol_version;
34 extern int module_id;
35 extern int do_compression_level;
36 extern char *skip_compress;
37
38 #ifndef Z_INSERT_ONLY
39 #define Z_INSERT_ONLY Z_SYNC_FLUSH
40 #endif
41
42 static int compression_level; /* The compression level for the current file. */
43 static int skip_compression_level; /* The least possible compressing for handling skip-compress files. */
44 static int per_file_default_level; /* The default level that each new file gets prior to checking its suffix. */
45
46 struct suffix_tree {
47 struct suffix_tree *sibling;
48 struct suffix_tree *child;
49 char letter, word_end;
50 };
51
52 static char *match_list;
53 static struct suffix_tree *suftree;
54
55 void init_compression_level(void)
56 {
57 int min_level, max_level, def_level, off_level;
58
59 switch (do_compression) {
60 case CPRES_NONE:
61 return;
62 case CPRES_ZLIB:
63 case CPRES_ZLIBX:
64 min_level = 1;
65 max_level = Z_BEST_COMPRESSION;
66 def_level = 6; /* Z_DEFAULT_COMPRESSION is -1, so set it to the real default */
67 off_level = skip_compression_level = Z_NO_COMPRESSION;
68 if (do_compression_level == Z_DEFAULT_COMPRESSION)
69 do_compression_level = def_level;
70 break;
71 #ifdef SUPPORT_ZSTD
72 case CPRES_ZSTD:
73 min_level = skip_compression_level = ZSTD_minCLevel();
74 max_level = ZSTD_maxCLevel();
75 def_level = ZSTD_CLEVEL_DEFAULT;
76 off_level = CLVL_NOT_SPECIFIED;
77 if (do_compression_level == 0)
78 do_compression_level = def_level;
79 break;
80 #endif
81 #ifdef SUPPORT_LZ4
82 case CPRES_LZ4:
83 min_level = skip_compression_level = 0;
84 max_level = 0;
85 def_level = 0;
86 off_level = CLVL_NOT_SPECIFIED;
87 break;
88 #endif
89 default: /* paranoia to prevent missing case values */
90 assert(0);
91 }
92
93 if (do_compression_level == CLVL_NOT_SPECIFIED)
94 do_compression_level = def_level;
95 else if (do_compression_level == off_level) {
96 do_compression = CPRES_NONE;
97 return;
98 }
99
100 /* We don't bother with any errors or warnings -- just make sure that the values are valid. */
101 if (do_compression_level < min_level)
102 do_compression_level = min_level;
103 else if (do_compression_level > max_level)
104 do_compression_level = max_level;
105 }
106
107 static void add_suffix(struct suffix_tree **prior, char ltr, const char *str)
108 {
109 struct suffix_tree *node, *newnode;
110
111 if (ltr == '[') {
112 const char *after = strchr(str, ']');
113 /* Treat "[foo" and "[]" as having a literal '['. */
114 if (after && after++ != str+1) {
115 while ((ltr = *str++) != ']')
116 add_suffix(prior, ltr, after);
117 return;
118 }
119 }
120
121 for (node = *prior; node; prior = &node->sibling, node = node->sibling) {
122 if (node->letter == ltr) {
123 if (*str)
124 add_suffix(&node->child, *str, str+1);
125 else
126 node->word_end = 1;
127 return;
128 }
129 if (node->letter > ltr)
130 break;
131 }
132 if (!(newnode = new(struct suffix_tree)))
133 out_of_memory("add_suffix");
134 newnode->sibling = node;
135 newnode->child = NULL;
136 newnode->letter = ltr;
137 *prior = newnode;
138 if (*str) {
139 add_suffix(&newnode->child, *str, str+1);
140 newnode->word_end = 0;
141 } else
142 newnode->word_end = 1;
143 }
144
145 static void add_nocompress_suffixes(const char *str)
146 {
147 char *buf, *t;
148 const char *f = str;
149
150 if (!(buf = new_array(char, strlen(f) + 1)))
151 out_of_memory("add_nocompress_suffixes");
152
153 while (*f) {
154 if (*f == '/') {
155 f++;
156 continue;
157 }
158
159 t = buf;
160 do {
161 if (isUpper(f))
162 *t++ = toLower(f);
163 else
164 *t++ = *f;
165 } while (*++f != '/' && *f);
166 *t++ = '\0';
167
168 add_suffix(&suftree, *buf, buf+1);
169 }
170
171 free(buf);
172 }
173
174 static void init_set_compression(void)
175 {
176 const char *f;
177 char *t, *start;
178
179 if (skip_compress)
180 add_nocompress_suffixes(skip_compress);
181
182 /* A non-daemon transfer skips the default suffix list if the
183 * user specified --skip-compress. */
184 if (skip_compress && module_id < 0)
185 f = "";
186 else
187 f = lp_dont_compress(module_id);
188
189 if (!(match_list = t = new_array(char, strlen(f) + 2)))
190 out_of_memory("set_compression");
191
192 per_file_default_level = do_compression_level;
193
194 while (*f) {
195 if (*f == ' ') {
196 f++;
197 continue;
198 }
199
200 start = t;
201 do {
202 if (isUpper(f))
203 *t++ = toLower(f);
204 else
205 *t++ = *f;
206 } while (*++f != ' ' && *f);
207 *t++ = '\0';
208
209 if (t - start == 1+1 && *start == '*') {
210 /* Optimize a match-string of "*". */
211 *match_list = '\0';
212 suftree = NULL;
213 per_file_default_level = skip_compression_level;
214 break;
215 }
216
217 /* Move *.foo items into the stuffix tree. */
218 if (*start == '*' && start[1] == '.' && start[2]
219 && !strpbrk(start+2, ".?*")) {
220 add_suffix(&suftree, start[2], start+3);
221 t = start;
222 }
223 }
224 *t++ = '\0';
225 }
226
227 /* determine the compression level based on a wildcard filename list */
228 void set_compression(const char *fname)
229 {
230 const struct suffix_tree *node;
231 const char *s;
232 char ltr;
233
234 if (!do_compression)
235 return;
236
237 if (!match_list)
238 init_set_compression();
239
240 compression_level = per_file_default_level;
241
242 if (!*match_list && !suftree)
243 return;
244
245 if ((s = strrchr(fname, '/')) != NULL)
246 fname = s + 1;
247
248 for (s = match_list; *s; s += strlen(s) + 1) {
249 if (iwildmatch(s, fname)) {
250 compression_level = skip_compression_level;
251 return;
252 }
253 }
254
255 if (!(node = suftree) || !(s = strrchr(fname, '.'))
256 || s == fname || !(ltr = *++s))
257 return;
258
259 while (1) {
260 if (isUpper(&ltr))
261 ltr = toLower(&ltr);
262 while (node->letter != ltr) {
263 if (node->letter > ltr)
264 return;
265 if (!(node = node->sibling))
266 return;
267 }
268 if ((ltr = *++s) == '\0') {
269 if (node->word_end)
270 compression_level = skip_compression_level;
271 return;
272 }
273 if (!(node = node->child))
274 return;
275 }
276 }
277
278 /* non-compressing recv token */
279 static int32 simple_recv_token(int f, char **data)
280 {
281 static int32 residue;
282 static char *buf;
283 int32 n;
284
285 if (!buf) {
286 buf = new_array(char, CHUNK_SIZE);
287 if (!buf)
288 out_of_memory("simple_recv_token");
289 }
290
291 if (residue == 0) {
292 int32 i = read_int(f);
293 if (i <= 0)
294 return i;
295 residue = i;
296 }
297
298 *data = buf;
299 n = MIN(CHUNK_SIZE,residue);
300 residue -= n;
301 read_buf(f,buf,n);
302 return n;
303 }
304
305 /* non-compressing send token */
306 static void simple_send_token(int f, int32 token, struct map_struct *buf, OFF_T offset, int32 n)
307 {
308 if (n > 0) {
309 int32 len = 0;
310 while (len < n) {
311 int32 n1 = MIN(CHUNK_SIZE, n-len);
312 write_int(f, n1);
313 write_buf(f, map_ptr(buf, offset+len, n1), n1);
314 len += n1;
315 }
316 }
317 /* a -2 token means to send data only and no token */
318 if (token != -2)
319 write_int(f, -(token+1));
320 }
321
322 /* Flag bytes in compressed stream are encoded as follows: */
323 #define END_FLAG 0 /* that's all folks */
324 #define TOKEN_LONG 0x20 /* followed by 32-bit token number */
325 #define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */
326 #define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */
327 #define TOKEN_REL 0x80 /* + 6-bit relative token number */
328 #define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */
329
330 #define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */
331
332 /* zlib.h says that if we want to be able to compress something in a single
333 * call, avail_out must be at least 0.1% larger than avail_in plus 12 bytes.
334 * We'll add in 0.1%+16, just to be safe (and we'll avoid floating point,
335 * to ensure that this is a compile-time value). */
336 #define AVAIL_OUT_SIZE(avail_in_size) ((avail_in_size)*1001/1000+16)
337
338 /* For coding runs of tokens */
339 static int32 last_token = -1;
340 static int32 run_start;
341 static int32 last_run_end;
342
343 /* Deflation state */
344 static z_stream tx_strm;
345
346 /* Output buffer */
347 static char *obuf;
348
349 /* We want obuf to be able to hold both MAX_DATA_COUNT+2 bytes as well as
350 * AVAIL_OUT_SIZE(CHUNK_SIZE) bytes, so make sure that it's large enough. */
351 #if MAX_DATA_COUNT+2 > AVAIL_OUT_SIZE(CHUNK_SIZE)
352 #define OBUF_SIZE (MAX_DATA_COUNT+2)
353 #else
354 #define OBUF_SIZE AVAIL_OUT_SIZE(CHUNK_SIZE)
355 #endif
356
357 /* Send a deflated token */
358 static void
359 send_deflated_token(int f, int32 token, struct map_struct *buf, OFF_T offset, int32 nb, int32 toklen)
360 {
361 static int init_done, flush_pending;
362 int32 n, r;
363
364 if (last_token == -1) {
365 /* initialization */
366 if (!init_done) {
367 tx_strm.next_in = NULL;
368 tx_strm.zalloc = NULL;
369 tx_strm.zfree = NULL;
370 if (deflateInit2(&tx_strm, compression_level,
371 Z_DEFLATED, -15, 8,
372 Z_DEFAULT_STRATEGY) != Z_OK) {
373 rprintf(FERROR, "compression init failed\n");
374 exit_cleanup(RERR_PROTOCOL);
375 }
376 if ((obuf = new_array(char, OBUF_SIZE)) == NULL)
377 out_of_memory("send_deflated_token");
378 init_done = 1;
379 } else
380 deflateReset(&tx_strm);
381 last_run_end = 0;
382 run_start = token;
383 flush_pending = 0;
384 } else if (last_token == -2) {
385 run_start = token;
386 } else if (nb != 0 || token != last_token + 1
387 || token >= run_start + 65536) {
388 /* output previous run */
389 r = run_start - last_run_end;
390 n = last_token - run_start;
391 if (r >= 0 && r <= 63) {
392 write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
393 } else {
394 write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
395 write_int(f, run_start);
396 }
397 if (n != 0) {
398 write_byte(f, n);
399 write_byte(f, n >> 8);
400 }
401 last_run_end = last_token;
402 run_start = token;
403 }
404
405 last_token = token;
406
407 if (nb != 0 || flush_pending) {
408 /* deflate the data starting at offset */
409 int flush = Z_NO_FLUSH;
410 tx_strm.avail_in = 0;
411 tx_strm.avail_out = 0;
412 do {
413 if (tx_strm.avail_in == 0 && nb != 0) {
414 /* give it some more input */
415 n = MIN(nb, CHUNK_SIZE);
416 tx_strm.next_in = (Bytef *)
417 map_ptr(buf, offset, n);
418 tx_strm.avail_in = n;
419 nb -= n;
420 offset += n;
421 }
422 if (tx_strm.avail_out == 0) {
423 tx_strm.next_out = (Bytef *)(obuf + 2);
424 tx_strm.avail_out = MAX_DATA_COUNT;
425 if (flush != Z_NO_FLUSH) {
426 /*
427 * We left the last 4 bytes in the
428 * buffer, in case they are the
429 * last 4. Move them to the front.
430 */
431 memcpy(tx_strm.next_out, obuf+MAX_DATA_COUNT-2, 4);
432 tx_strm.next_out += 4;
433 tx_strm.avail_out -= 4;
434 }
435 }
436 if (nb == 0 && token != -2)
437 flush = Z_SYNC_FLUSH;
438 r = deflate(&tx_strm, flush);
439 if (r != Z_OK) {
440 rprintf(FERROR, "deflate returned %d\n", r);
441 exit_cleanup(RERR_STREAMIO);
442 }
443 if (nb == 0 || tx_strm.avail_out == 0) {
444 n = MAX_DATA_COUNT - tx_strm.avail_out;
445 if (flush != Z_NO_FLUSH) {
446 /*
447 * We have to trim off the last 4
448 * bytes of output when flushing
449 * (they are just 0, 0, ff, ff).
450 */
451 n -= 4;
452 }
453 if (n > 0) {
454 obuf[0] = DEFLATED_DATA + (n >> 8);
455 obuf[1] = n;
456 write_buf(f, obuf, n+2);
457 }
458 }
459 } while (nb != 0 || tx_strm.avail_out == 0);
460 flush_pending = token == -2;
461 }
462
463 if (token == -1) {
464 /* end of file - clean up */
465 write_byte(f, END_FLAG);
466 } else if (token != -2 && do_compression == CPRES_ZLIB) {
467 /* Add the data in the current block to the compressor's
468 * history and hash table. */
469 do {
470 /* Break up long sections in the same way that
471 * see_deflate_token() does. */
472 int32 n1 = toklen > 0xffff ? 0xffff : toklen;
473 toklen -= n1;
474 tx_strm.next_in = (Bytef *)map_ptr(buf, offset, n1);
475 tx_strm.avail_in = n1;
476 if (protocol_version >= 31) /* Newer protocols avoid a data-duplicating bug */
477 offset += n1;
478 tx_strm.next_out = (Bytef *) obuf;
479 tx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
480 r = deflate(&tx_strm, Z_INSERT_ONLY);
481 if (r != Z_OK || tx_strm.avail_in != 0) {
482 rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
483 r, tx_strm.avail_in);
484 exit_cleanup(RERR_STREAMIO);
485 }
486 } while (toklen > 0);
487 }
488 }
489
490 /* tells us what the receiver is in the middle of doing */
491 static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;
492
493 /* for inflating stuff */
494 static z_stream rx_strm;
495 static char *cbuf;
496 static char *dbuf;
497
498 /* for decoding runs of tokens */
499 static int32 rx_token;
500 static int32 rx_run;
501
502 /* Receive a deflated token and inflate it */
503 static int32 recv_deflated_token(int f, char **data)
504 {
505 static int init_done;
506 static int32 saved_flag;
507 int32 n, flag;
508 int r;
509
510 for (;;) {
511 switch (recv_state) {
512 case r_init:
513 if (!init_done) {
514 rx_strm.next_out = NULL;
515 rx_strm.zalloc = NULL;
516 rx_strm.zfree = NULL;
517 if (inflateInit2(&rx_strm, -15) != Z_OK) {
518 rprintf(FERROR, "inflate init failed\n");
519 exit_cleanup(RERR_PROTOCOL);
520 }
521 if (!(cbuf = new_array(char, MAX_DATA_COUNT))
522 || !(dbuf = new_array(char, AVAIL_OUT_SIZE(CHUNK_SIZE))))
523 out_of_memory("recv_deflated_token");
524 init_done = 1;
525 } else {
526 inflateReset(&rx_strm);
527 }
528 recv_state = r_idle;
529 rx_token = 0;
530 break;
531
532 case r_idle:
533 case r_inflated:
534 if (saved_flag) {
535 flag = saved_flag & 0xff;
536 saved_flag = 0;
537 } else
538 flag = read_byte(f);
539 if ((flag & 0xC0) == DEFLATED_DATA) {
540 n = ((flag & 0x3f) << 8) + read_byte(f);
541 read_buf(f, cbuf, n);
542 rx_strm.next_in = (Bytef *)cbuf;
543 rx_strm.avail_in = n;
544 recv_state = r_inflating;
545 break;
546 }
547 if (recv_state == r_inflated) {
548 /* check previous inflated stuff ended correctly */
549 rx_strm.avail_in = 0;
550 rx_strm.next_out = (Bytef *)dbuf;
551 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
552 r = inflate(&rx_strm, Z_SYNC_FLUSH);
553 n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out;
554 /*
555 * Z_BUF_ERROR just means no progress was
556 * made, i.e. the decompressor didn't have
557 * any pending output for us.
558 */
559 if (r != Z_OK && r != Z_BUF_ERROR) {
560 rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
561 r, n);
562 exit_cleanup(RERR_STREAMIO);
563 }
564 if (n != 0 && r != Z_BUF_ERROR) {
565 /* have to return some more data and
566 save the flag for later. */
567 saved_flag = flag + 0x10000;
568 *data = dbuf;
569 return n;
570 }
571 /*
572 * At this point the decompressor should
573 * be expecting to see the 0, 0, ff, ff bytes.
574 */
575 if (!inflateSyncPoint(&rx_strm)) {
576 rprintf(FERROR, "decompressor lost sync!\n");
577 exit_cleanup(RERR_STREAMIO);
578 }
579 rx_strm.avail_in = 4;
580 rx_strm.next_in = (Bytef *)cbuf;
581 cbuf[0] = cbuf[1] = 0;
582 cbuf[2] = cbuf[3] = 0xff;
583 inflate(&rx_strm, Z_SYNC_FLUSH);
584 recv_state = r_idle;
585 }
586 if (flag == END_FLAG) {
587 /* that's all folks */
588 recv_state = r_init;
589 return 0;
590 }
591
592 /* here we have a token of some kind */
593 if (flag & TOKEN_REL) {
594 rx_token += flag & 0x3f;
595 flag >>= 6;
596 } else
597 rx_token = read_int(f);
598 if (flag & 1) {
599 rx_run = read_byte(f);
600 rx_run += read_byte(f) << 8;
601 recv_state = r_running;
602 }
603 return -1 - rx_token;
604
605 case r_inflating:
606 rx_strm.next_out = (Bytef *)dbuf;
607 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
608 r = inflate(&rx_strm, Z_NO_FLUSH);
609 n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out;
610 if (r != Z_OK) {
611 rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
612 exit_cleanup(RERR_STREAMIO);
613 }
614 if (rx_strm.avail_in == 0)
615 recv_state = r_inflated;
616 if (n != 0) {
617 *data = dbuf;
618 return n;
619 }
620 break;
621
622 case r_running:
623 ++rx_token;
624 if (--rx_run == 0)
625 recv_state = r_idle;
626 return -1 - rx_token;
627 }
628 }
629 }
630
631 /*
632 * put the data corresponding to a token that we've just returned
633 * from recv_deflated_token into the decompressor's history buffer.
634 */
635 static void see_deflate_token(char *buf, int32 len)
636 {
637 int r;
638 int32 blklen;
639 unsigned char hdr[5];
640
641 rx_strm.avail_in = 0;
642 blklen = 0;
643 hdr[0] = 0;
644 do {
645 if (rx_strm.avail_in == 0 && len != 0) {
646 if (blklen == 0) {
647 /* Give it a fake stored-block header. */
648 rx_strm.next_in = (Bytef *)hdr;
649 rx_strm.avail_in = 5;
650 blklen = len;
651 if (blklen > 0xffff)
652 blklen = 0xffff;
653 hdr[1] = blklen;
654 hdr[2] = blklen >> 8;
655 hdr[3] = ~hdr[1];
656 hdr[4] = ~hdr[2];
657 } else {
658 rx_strm.next_in = (Bytef *)buf;
659 rx_strm.avail_in = blklen;
660 if (protocol_version >= 31) /* Newer protocols avoid a data-duplicating bug */
661 buf += blklen;
662 len -= blklen;
663 blklen = 0;
664 }
665 }
666 rx_strm.next_out = (Bytef *)dbuf;
667 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
668 r = inflate(&rx_strm, Z_SYNC_FLUSH);
669 if (r != Z_OK && r != Z_BUF_ERROR) {
670 rprintf(FERROR, "inflate (token) returned %d\n", r);
671 exit_cleanup(RERR_STREAMIO);
672 }
673 } while (len || rx_strm.avail_out == 0);
674 }
675
676 #ifdef SUPPORT_ZSTD
677
678 static ZSTD_inBuffer zstd_in_buff;
679 static ZSTD_outBuffer zstd_out_buff;
680 static ZSTD_CCtx *zstd_cctx;
681
682 static void send_zstd_token(int f, int32 token, struct map_struct *buf, OFF_T offset, int32 nb)
683 {
684 static int comp_init_done, flush_pending;
685 ZSTD_EndDirective flush = ZSTD_e_continue;
686 int32 n, r;
687
688 /* initialization */
689 if (!comp_init_done) {
690
691 zstd_cctx = ZSTD_createCCtx();
692 if (!zstd_cctx) {
693 rprintf(FERROR, "compression init failed\n");
694 exit_cleanup(RERR_PROTOCOL);
695 }
696
697 obuf = new_array(char, OBUF_SIZE);
698 if (!obuf)
699 out_of_memory("send_deflated_token");
700
701 ZSTD_CCtx_setParameter(zstd_cctx, ZSTD_c_compressionLevel, do_compression_level);
702 zstd_out_buff.dst = obuf + 2;
703
704 comp_init_done = 1;
705 }
706
707 if (last_token == -1) {
708 last_run_end = 0;
709 run_start = token;
710 flush_pending = 0;
711 } else if (last_token == -2) {
712 run_start = token;
713
714 } else if (nb != 0 || token != last_token + 1
715 || token >= run_start + 65536) {
716
717 /* output previous run */
718 r = run_start - last_run_end;
719 n = last_token - run_start;
720
721 if (r >= 0 && r <= 63) {
722 write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
723 } else {
724 write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
725 write_int(f, run_start);
726 }
727 if (n != 0) {
728 write_byte(f, n);
729 write_byte(f, n >> 8);
730 }
731 last_run_end = last_token;
732 run_start = token;
733 }
734
735 last_token = token;
736
737 if (nb || flush_pending) {
738
739 zstd_in_buff.src = map_ptr(buf, offset, nb);
740 zstd_in_buff.size = nb;
741 zstd_in_buff.pos = 0;
742
743 do {
744 if (zstd_out_buff.size == 0) {
745 zstd_out_buff.size = MAX_DATA_COUNT;
746 zstd_out_buff.pos = 0;
747 }
748
749 /* File ended, flush */
750 if (token != -2)
751 flush = ZSTD_e_flush;
752
753 r = ZSTD_compressStream2(zstd_cctx, &zstd_out_buff, &zstd_in_buff, flush);
754 if (ZSTD_isError(r)) {
755 rprintf(FERROR, "ZSTD_compressStream returned %d\n", r);
756 exit_cleanup(RERR_STREAMIO);
757 }
758
759 /*
760 * Nothing is sent if the buffer isn't full so avoid smaller
761 * transfers. If a file is finished then we flush the internal
762 * state and send a smaller buffer so that the remote side can
763 * finish the file.
764 */
765 if (zstd_out_buff.pos == zstd_out_buff.size || flush == ZSTD_e_flush) {
766 n = zstd_out_buff.pos;
767
768 obuf[0] = DEFLATED_DATA + (n >> 8);
769 obuf[1] = n;
770 write_buf(f, obuf, n+2);
771
772 zstd_out_buff.size = 0;
773 }
774 /*
775 * Loop while the input buffer isn't full consumed or the
776 * internal state isn't fully flushed.
777 */
778 } while (zstd_in_buff.pos < zstd_in_buff.size || r > 0);
779 flush_pending = token == -2;
780 }
781
782 if (token == -1) {
783 /* end of file - clean up */
784 write_byte(f, END_FLAG);
785 }
786 }
787
788 static ZSTD_DCtx *zstd_dctx;
789
790 static int32 recv_zstd_token(int f, char **data)
791 {
792 static int decomp_init_done;
793 static int out_buffer_size;
794 int32 n, flag;
795 int r;
796
797 if (!decomp_init_done) {
798
799 zstd_dctx = ZSTD_createDCtx();
800 if (!zstd_dctx) {
801 rprintf(FERROR, "ZSTD_createDStream failed\n");
802 exit_cleanup(RERR_PROTOCOL);
803 }
804
805 /* Output buffer fits two decompressed blocks */
806 out_buffer_size = ZSTD_DStreamOutSize() * 2;
807 cbuf = new_array(char, MAX_DATA_COUNT);
808 dbuf = new_array(char, out_buffer_size);
809 if (!cbuf || !dbuf)
810 out_of_memory("recv_zstd_token");
811
812 zstd_in_buff.src = cbuf;
813 zstd_out_buff.dst = dbuf;
814
815 decomp_init_done = 1;
816 }
817
818 do {
819 switch (recv_state) {
820 case r_init:
821 recv_state = r_idle;
822 rx_token = 0;
823 break;
824
825 case r_idle:
826 flag = read_byte(f);
827 if ((flag & 0xC0) == DEFLATED_DATA) {
828 n = ((flag & 0x3f) << 8) + read_byte(f);
829 read_buf(f, cbuf, n);
830
831 zstd_in_buff.size = n;
832 zstd_in_buff.pos = 0;
833
834 recv_state = r_inflating;
835
836 } else if (flag == END_FLAG) {
837 /* that's all folks */
838 recv_state = r_init;
839 return 0;
840
841 } else {
842 /* here we have a token of some kind */
843 if (flag & TOKEN_REL) {
844 rx_token += flag & 0x3f;
845 flag >>= 6;
846 } else
847 rx_token = read_int(f);
848 if (flag & 1) {
849 rx_run = read_byte(f);
850 rx_run += read_byte(f) << 8;
851 recv_state = r_running;
852 }
853 return -1 - rx_token;
854 }
855 break;
856
857 case r_inflating:
858 zstd_out_buff.size = out_buffer_size;
859 zstd_out_buff.pos = 0;
860
861 r = ZSTD_decompressStream(zstd_dctx, &zstd_out_buff, &zstd_in_buff);
862 n = zstd_out_buff.pos;
863 if (ZSTD_isError(r)) {
864 rprintf(FERROR, "ZSTD decomp returned %d (%d bytes)\n", r, n);
865 exit_cleanup(RERR_STREAMIO);
866 }
867
868 /*
869 * If the input buffer is fully consumed and the output
870 * buffer is not full then next step is to read more
871 * data.
872 */
873 if (zstd_in_buff.size == zstd_in_buff.pos && n < out_buffer_size)
874 recv_state = r_idle;
875
876 if (n != 0) {
877 *data = dbuf;
878 return n;
879 }
880 break;
881
882 case r_running:
883 ++rx_token;
884 if (--rx_run == 0)
885 recv_state = r_idle;
886 return -1 - rx_token;
887 break;
888
889 case r_inflated:
890 break;
891 }
892 } while (1);
893 }
894 #endif /* SUPPORT_ZSTD */
895
896 #ifdef SUPPORT_LZ4
897 static void
898 send_compressed_token(int f, int32 token, struct map_struct *buf, OFF_T offset, int32 nb)
899 {
900 static int init_done, flush_pending;
901 int size = MAX(LZ4_compressBound(CHUNK_SIZE), MAX_DATA_COUNT+2);
902 int32 n, r;
903
904 if (last_token == -1) {
905 if (!init_done) {
906 if ((obuf = new_array(char, size)) == NULL)
907 out_of_memory("send_compressed_token");
908 init_done = 1;
909 }
910 last_run_end = 0;
911 run_start = token;
912 flush_pending = 0;
913 } else if (last_token == -2) {
914 run_start = token;
915 } else if (nb != 0 || token != last_token + 1
916 || token >= run_start + 65536) {
917 /* output previous run */
918 r = run_start - last_run_end;
919 n = last_token - run_start;
920 if (r >= 0 && r <= 63) {
921 write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
922 } else {
923 write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
924 write_int(f, run_start);
925 }
926 if (n != 0) {
927 write_byte(f, n);
928 write_byte(f, n >> 8);
929 }
930 last_run_end = last_token;
931 run_start = token;
932 }
933
934 last_token = token;
935
936 if (nb != 0 || flush_pending) {
937 int available_in, available_out = 0;
938 const char *next_in;
939
940 do {
941 char *ptr = obuf;
942 char *next_out = obuf + 2;
943
944 if (available_out == 0) {
945 available_in = MIN(nb, MAX_DATA_COUNT);
946 next_in = map_ptr(buf, offset, available_in);
947 } else
948 available_in /= 2;
949
950 available_out = LZ4_compress_default(next_in, next_out, available_in, size - 2);
951 if (!available_out) {
952 rprintf(FERROR, "compress returned %d\n", available_out);
953 exit_cleanup(RERR_STREAMIO);
954 }
955 if (available_out <= MAX_DATA_COUNT) {
956 ptr[0] = DEFLATED_DATA + (available_out >> 8);
957 ptr[1] = available_out;
958
959 write_buf(f, ptr, available_out + 2);
960
961 available_out = 0;
962 nb -= available_in;
963 offset += available_in;
964 }
965 } while (nb != 0);
966 flush_pending = token == -2;
967 }
968 if (token == -1)
969 /* end of file - clean up */
970 write_byte(f, END_FLAG);
971 }
972
973 static int32 recv_compressed_token(int f, char **data)
974 {
975 static int32 saved_flag;
976 static int init_done;
977 int32 n, flag;
978 int size = MAX(LZ4_compressBound(CHUNK_SIZE), MAX_DATA_COUNT+2);
979 static const char *next_in;
980 static int avail_in;
981 int avail_out;
982
983 for (;;) {
984 switch (recv_state) {
985 case r_init:
986 if (!init_done) {
987 if (!(cbuf = new_array(char, MAX_DATA_COUNT))
988 || !(dbuf = new_array(char, size)))
989 out_of_memory("recv_compressed_token");
990 init_done = 1;
991 }
992 recv_state = r_idle;
993 rx_token = 0;
994 break;
995 case r_idle:
996 case r_inflated:
997 if (saved_flag) {
998 flag = saved_flag & 0xff;
999 saved_flag = 0;
1000 } else
1001 flag = read_byte(f);
1002 if ((flag & 0xC0) == DEFLATED_DATA) {
1003 n = ((flag & 0x3f) << 8) + read_byte(f);
1004 read_buf(f, cbuf, n);
1005 next_in = (char *)cbuf;
1006 avail_in = n;
1007 recv_state = r_inflating;
1008 break;
1009 }
1010
1011 if (recv_state == r_inflated)
1012 recv_state = r_idle;
1013
1014 if (flag == END_FLAG) {
1015 /* that's all folks */
1016 recv_state = r_init;
1017 return 0;
1018 }
1019
1020 /* here we have a token of some kind */
1021 if (flag & TOKEN_REL) {
1022 rx_token += flag & 0x3f;
1023 flag >>= 6;
1024 } else
1025 rx_token = read_int(f);
1026 if (flag & 1) {
1027 rx_run = read_byte(f);
1028 rx_run += read_byte(f) << 8;
1029 recv_state = r_running;
1030 }
1031 return -1 - rx_token;
1032
1033 case r_inflating:
1034 avail_out = LZ4_decompress_safe(next_in, dbuf, avail_in, size);
1035 if (avail_out < 0) {
1036 rprintf(FERROR, "uncompress failed: %d\n", avail_out);
1037 exit_cleanup(RERR_STREAMIO);
1038 }
1039 recv_state = r_inflated;
1040 *data = dbuf;
1041 return avail_out;
1042
1043 case r_running:
1044 ++rx_token;
1045 if (--rx_run == 0)
1046 recv_state = r_idle;
1047 return -1 - rx_token;
1048 }
1049 }
1050
1051 }
1052
1053 # if 0
1054 static void see_uncompressed_token(char *buf, int32 len)
1055 {
1056 static const char *next_in;
1057 static int avail_in;
1058 int avail_out;
1059
1060 int32 blklen;
1061 char hdr[5];
1062
1063 avail_in = 0;
1064 blklen = 0;
1065 hdr[0] = 0;
1066 do {
1067 if (avail_in == 0 && len != 0) {
1068 if (blklen == 0) {
1069 /* Give it a fake stored-block header. */
1070 next_in = hdr;
1071 avail_in = 5;
1072 blklen = len;
1073 if (blklen > 0xffff)
1074 blklen = 0xffff;
1075 hdr[1] = blklen;
1076 hdr[2] = blklen >> 8;
1077 hdr[3] = ~hdr[1];
1078 hdr[4] = ~hdr[2];
1079 } else {
1080 next_in = (char *)buf;
1081 avail_in = blklen;
1082 if (protocol_version >= 31) /* Newer protocols avoid a data-duplicating bug */
1083 buf += blklen;
1084 len -= blklen;
1085 blklen = 0;
1086 }
1087 }
1088 avail_out = LZ4_decompress_safe(next_in, dbuf, avail_in, LZ4_compressBound(CHUNK_SIZE));
1089 if (avail_out < 0) {
1090 rprintf(FERROR, "uncompress failed: %d\n", avail_out);
1091 exit_cleanup(RERR_STREAMIO);
1092 }
1093
1094 } while (len);
1095 }
1096 # endif /* 0 */
1097 #endif /* SUPPORT_LZ4 */
1098
1099 /**
1100 * Transmit a verbatim buffer of length @p n followed by a token.
1101 * If token == -1 then we have reached EOF
1102 * If n == 0 then don't send a buffer
1103 */
1104 void send_token(int f, int32 token, struct map_struct *buf, OFF_T offset,
1105 int32 n, int32 toklen)
1106 {
1107 switch (do_compression) {
1108 case CPRES_NONE:
1109 simple_send_token(f, token, buf, offset, n);
1110 break;
1111 case CPRES_ZLIB:
1112 case CPRES_ZLIBX:
1113 send_deflated_token(f, token, buf, offset, n, toklen);
1114 break;
1115 #ifdef SUPPORT_ZSTD
1116 case CPRES_ZSTD:
1117 send_zstd_token(f, token, buf, offset, n);
1118 break;
1119 #endif
1120 #ifdef SUPPORT_LZ4
1121 case CPRES_LZ4:
1122 send_compressed_token(f, token, buf, offset, n);
1123 break;
1124 #endif
1125 default:
1126 assert(0);
1127 }
1128 }
1129
1130 /*
1131 * receive a token or buffer from the other end. If the return value is >0 then
1132 * it is a data buffer of that length, and *data will point at the data.
1133 * if the return value is -i then it represents token i-1
1134 * if the return value is 0 then the end has been reached
1135 */
1136 int32 recv_token(int f, char **data)
1137 {
1138 switch (do_compression) {
1139 case CPRES_NONE:
1140 return simple_recv_token(f,data);
1141 case CPRES_ZLIB:
1142 case CPRES_ZLIBX:
1143 return recv_deflated_token(f, data);
1144 #ifdef SUPPORT_ZSTD
1145 case CPRES_ZSTD:
1146 return recv_zstd_token(f, data);
1147 #endif
1148 #ifdef SUPPORT_LZ4
1149 case CPRES_LZ4:
1150 return recv_compressed_token(f, data);
1151 #endif
1152 default:
1153 assert(0);
1154 }
1155 }
1156
1157 /*
1158 * look at the data corresponding to a token, if necessary
1159 */
1160 void see_token(char *data, int32 toklen)
1161 {
1162 switch (do_compression) {
1163 case CPRES_NONE:
1164 break;
1165 case CPRES_ZLIB:
1166 see_deflate_token(data, toklen);
1167 break;
1168 case CPRES_ZLIBX:
1169 break;
1170 #ifdef SUPPORT_LZ4
1171 case CPRES_LZ4:
1172 /*see_uncompressed_token(data, toklen);*/
1173 break;
1174 #endif
1175 #ifdef SUPPORT_LZ4
1176 case CPRES_ZSTD:
1177 break;
1178 #endif
1179 default:
1180 assert(0);
1181 }
1182 }
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