Commit | Line | Data |
---|---|---|
d67c8bdf | 1 | /* |
70d794dc AT |
2 | Copyright (C) Andrew Tridgell 1996 |
3 | Copyright (C) Paul Mackerras 1996 | |
d67c8bdf | 4 | |
70d794dc AT |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
d67c8bdf | 9 | |
70d794dc AT |
10 | This program is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
d67c8bdf | 14 | |
70d794dc AT |
15 | You should have received a copy of the GNU General Public License |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | #include "rsync.h" | |
5914bf15 | 21 | #include "zlib/zlib.h" |
70d794dc AT |
22 | |
23 | extern int do_compression; | |
d67c8bdf | 24 | extern int module_id; |
d67c8bdf | 25 | |
83fff1aa | 26 | static int compression_level = Z_DEFAULT_COMPRESSION; |
70d794dc | 27 | |
83fff1aa AT |
28 | /* determine the compression level based on a wildcard filename list */ |
29 | void set_compression(char *fname) | |
30 | { | |
83fff1aa AT |
31 | char *dont; |
32 | char *tok; | |
33 | ||
d67c8bdf WD |
34 | if (!do_compression) |
35 | return; | |
83fff1aa | 36 | |
63f0774f | 37 | compression_level = Z_DEFAULT_COMPRESSION; |
83fff1aa AT |
38 | dont = lp_dont_compress(module_id); |
39 | ||
d67c8bdf WD |
40 | if (!dont || !*dont) |
41 | return; | |
83fff1aa | 42 | |
d67c8bdf | 43 | if (dont[0] == '*' && !dont[1]) { |
63f0774f DD |
44 | /* an optimization to skip the rest of this routine */ |
45 | compression_level = 0; | |
46 | return; | |
47 | } | |
48 | ||
83fff1aa AT |
49 | dont = strdup(dont); |
50 | fname = strdup(fname); | |
d67c8bdf WD |
51 | if (!dont || !fname) |
52 | return; | |
83fff1aa AT |
53 | |
54 | strlower(dont); | |
55 | strlower(fname); | |
56 | ||
d67c8bdf | 57 | for (tok = strtok(dont, " "); tok; tok = strtok(NULL, " ")) { |
fe332038 | 58 | if (wildmatch(tok, fname)) { |
83fff1aa AT |
59 | compression_level = 0; |
60 | break; | |
61 | } | |
62 | } | |
63 | free(dont); | |
64 | free(fname); | |
65 | } | |
70d794dc AT |
66 | |
67 | /* non-compressing recv token */ | |
68 | static int simple_recv_token(int f,char **data) | |
69 | { | |
c5eb3650 AT |
70 | static int residue; |
71 | static char *buf; | |
72 | int n; | |
70d794dc | 73 | |
c5eb3650 | 74 | if (!buf) { |
58cadc86 | 75 | buf = new_array(char, CHUNK_SIZE); |
d67c8bdf WD |
76 | if (!buf) |
77 | out_of_memory("simple_recv_token"); | |
c5eb3650 | 78 | } |
70d794dc | 79 | |
c5eb3650 AT |
80 | if (residue == 0) { |
81 | int i = read_int(f); | |
d67c8bdf WD |
82 | if (i <= 0) |
83 | return i; | |
c5eb3650 AT |
84 | residue = i; |
85 | } | |
70d794dc | 86 | |
c5eb3650 AT |
87 | *data = buf; |
88 | n = MIN(CHUNK_SIZE,residue); | |
89 | residue -= n; | |
90 | read_buf(f,buf,n); | |
91 | return n; | |
70d794dc AT |
92 | } |
93 | ||
94 | ||
95 | /* non-compressing send token */ | |
c6e7fcb4 | 96 | static void simple_send_token(int f,int token, |
45f133b9 | 97 | struct map_struct *buf,OFF_T offset,int n) |
70d794dc | 98 | { |
c5eb3650 AT |
99 | if (n > 0) { |
100 | int l = 0; | |
101 | while (l < n) { | |
102 | int n1 = MIN(CHUNK_SIZE,n-l); | |
103 | write_int(f,n1); | |
104 | write_buf(f,map_ptr(buf,offset+l,n1),n1); | |
105 | l += n1; | |
106 | } | |
107 | } | |
45f133b9 AT |
108 | /* a -2 token means to send data only and no token */ |
109 | if (token != -2) { | |
110 | write_int(f,-(token+1)); | |
111 | } | |
70d794dc AT |
112 | } |
113 | ||
114 | ||
861c20b4 PM |
115 | /* Flag bytes in compressed stream are encoded as follows: */ |
116 | #define END_FLAG 0 /* that's all folks */ | |
117 | #define TOKEN_LONG 0x20 /* followed by 32-bit token number */ | |
118 | #define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */ | |
119 | #define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */ | |
120 | #define TOKEN_REL 0x80 /* + 6-bit relative token number */ | |
121 | #define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */ | |
122 | ||
123 | #define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */ | |
124 | ||
24733919 WD |
125 | /* zlib.h says that if we want to be able to compress something in a single |
126 | * call, avail_out must be at least 0.1% larger than avail_in plus 12 bytes. | |
127 | * We'll add in 0.1%+16, just to be safe (and we'll avoid floating point, | |
128 | * to ensure that this is a compile-time value). */ | |
129 | #define AVAIL_OUT_SIZE(avail_in_size) ((avail_in_size)*1001/1000+16) | |
130 | ||
861c20b4 PM |
131 | /* For coding runs of tokens */ |
132 | static int last_token = -1; | |
133 | static int run_start; | |
134 | static int last_run_end; | |
135 | ||
136 | /* Deflation state */ | |
137 | static z_stream tx_strm; | |
138 | ||
139 | /* Output buffer */ | |
3a6a366f | 140 | static char *obuf; |
24733919 WD |
141 | |
142 | /* We want obuf to be able to hold both MAX_DATA_COUNT+2 bytes as well as | |
143 | * AVAIL_OUT_SIZE(CHUNK_SIZE) bytes, so make sure that it's large enough. */ | |
144 | #if MAX_DATA_COUNT+2 > AVAIL_OUT_SIZE(CHUNK_SIZE) | |
145 | #define OBUF_SIZE (MAX_DATA_COUNT+2) | |
146 | #else | |
147 | #define OBUF_SIZE AVAIL_OUT_SIZE(CHUNK_SIZE) | |
148 | #endif | |
861c20b4 PM |
149 | |
150 | /* Send a deflated token */ | |
151 | static void | |
152 | send_deflated_token(int f, int token, | |
45f133b9 | 153 | struct map_struct *buf, OFF_T offset, int nb, int toklen) |
861c20b4 | 154 | { |
5914bf15 PM |
155 | int n, r; |
156 | static int init_done, flush_pending; | |
157 | ||
158 | if (last_token == -1) { | |
159 | /* initialization */ | |
160 | if (!init_done) { | |
161 | tx_strm.next_in = NULL; | |
162 | tx_strm.zalloc = NULL; | |
163 | tx_strm.zfree = NULL; | |
83fff1aa | 164 | if (deflateInit2(&tx_strm, compression_level, |
5914bf15 PM |
165 | Z_DEFLATED, -15, 8, |
166 | Z_DEFAULT_STRATEGY) != Z_OK) { | |
167 | rprintf(FERROR, "compression init failed\n"); | |
65417579 | 168 | exit_cleanup(RERR_STREAMIO); |
5914bf15 | 169 | } |
58cadc86 | 170 | if ((obuf = new_array(char, OBUF_SIZE)) == NULL) |
5914bf15 PM |
171 | out_of_memory("send_deflated_token"); |
172 | init_done = 1; | |
173 | } else | |
174 | deflateReset(&tx_strm); | |
175 | last_run_end = 0; | |
176 | run_start = token; | |
177 | flush_pending = 0; | |
178 | ||
179 | } else if (last_token == -2) { | |
180 | run_start = token; | |
181 | ||
182 | } else if (nb != 0 || token != last_token + 1 | |
183 | || token >= run_start + 65536) { | |
184 | /* output previous run */ | |
185 | r = run_start - last_run_end; | |
186 | n = last_token - run_start; | |
187 | if (r >= 0 && r <= 63) { | |
188 | write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r); | |
189 | } else { | |
190 | write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG)); | |
191 | write_int(f, run_start); | |
192 | } | |
193 | if (n != 0) { | |
194 | write_byte(f, n); | |
195 | write_byte(f, n >> 8); | |
196 | } | |
197 | last_run_end = last_token; | |
198 | run_start = token; | |
861c20b4 | 199 | } |
5914bf15 PM |
200 | |
201 | last_token = token; | |
202 | ||
203 | if (nb != 0 || flush_pending) { | |
204 | /* deflate the data starting at offset */ | |
205 | int flush = Z_NO_FLUSH; | |
206 | tx_strm.avail_in = 0; | |
207 | tx_strm.avail_out = 0; | |
208 | do { | |
209 | if (tx_strm.avail_in == 0 && nb != 0) { | |
210 | /* give it some more input */ | |
211 | n = MIN(nb, CHUNK_SIZE); | |
212 | tx_strm.next_in = (Bytef *) | |
213 | map_ptr(buf, offset, n); | |
214 | tx_strm.avail_in = n; | |
215 | nb -= n; | |
216 | offset += n; | |
217 | } | |
218 | if (tx_strm.avail_out == 0) { | |
219 | tx_strm.next_out = (Bytef *)(obuf + 2); | |
220 | tx_strm.avail_out = MAX_DATA_COUNT; | |
221 | if (flush != Z_NO_FLUSH) { | |
222 | /* | |
223 | * We left the last 4 bytes in the | |
224 | * buffer, in case they are the | |
225 | * last 4. Move them to the front. | |
226 | */ | |
227 | memcpy(tx_strm.next_out, | |
228 | obuf+MAX_DATA_COUNT-2, 4); | |
229 | tx_strm.next_out += 4; | |
230 | tx_strm.avail_out -= 4; | |
231 | } | |
232 | } | |
233 | if (nb == 0 && token != -2) | |
234 | flush = Z_SYNC_FLUSH; | |
235 | r = deflate(&tx_strm, flush); | |
236 | if (r != Z_OK) { | |
237 | rprintf(FERROR, "deflate returned %d\n", r); | |
65417579 | 238 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
239 | } |
240 | if (nb == 0 || tx_strm.avail_out == 0) { | |
241 | n = MAX_DATA_COUNT - tx_strm.avail_out; | |
242 | if (flush != Z_NO_FLUSH) { | |
243 | /* | |
244 | * We have to trim off the last 4 | |
245 | * bytes of output when flushing | |
246 | * (they are just 0, 0, ff, ff). | |
247 | */ | |
248 | n -= 4; | |
249 | } | |
250 | if (n > 0) { | |
251 | obuf[0] = DEFLATED_DATA + (n >> 8); | |
252 | obuf[1] = n; | |
253 | write_buf(f, obuf, n+2); | |
254 | } | |
255 | } | |
256 | } while (nb != 0 || tx_strm.avail_out == 0); | |
257 | flush_pending = token == -2; | |
861c20b4 | 258 | } |
861c20b4 | 259 | |
5914bf15 PM |
260 | if (token == -1) { |
261 | /* end of file - clean up */ | |
262 | write_byte(f, END_FLAG); | |
5914bf15 PM |
263 | } else if (token != -2) { |
264 | /* add the data in the current block to the compressor's | |
265 | history and hash table */ | |
266 | tx_strm.next_in = (Bytef *) map_ptr(buf, offset, toklen); | |
267 | tx_strm.avail_in = toklen; | |
268 | tx_strm.next_out = (Bytef *) obuf; | |
24733919 | 269 | tx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE); |
5914bf15 PM |
270 | r = deflate(&tx_strm, Z_INSERT_ONLY); |
271 | if (r != Z_OK || tx_strm.avail_in != 0) { | |
272 | rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n", | |
273 | r, tx_strm.avail_in); | |
65417579 | 274 | exit_cleanup(RERR_STREAMIO); |
861c20b4 | 275 | } |
861c20b4 | 276 | } |
861c20b4 PM |
277 | } |
278 | ||
279 | ||
280 | /* tells us what the receiver is in the middle of doing */ | |
281 | static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state; | |
70d794dc | 282 | |
861c20b4 PM |
283 | /* for inflating stuff */ |
284 | static z_stream rx_strm; | |
285 | static char *cbuf; | |
286 | static char *dbuf; | |
287 | ||
288 | /* for decoding runs of tokens */ | |
289 | static int rx_token; | |
290 | static int rx_run; | |
291 | ||
292 | /* Receive a deflated token and inflate it */ | |
293 | static int | |
294 | recv_deflated_token(int f, char **data) | |
295 | { | |
5914bf15 PM |
296 | int n, r, flag; |
297 | static int init_done; | |
298 | static int saved_flag; | |
299 | ||
300 | for (;;) { | |
301 | switch (recv_state) { | |
302 | case r_init: | |
303 | if (!init_done) { | |
304 | rx_strm.next_out = NULL; | |
305 | rx_strm.zalloc = NULL; | |
306 | rx_strm.zfree = NULL; | |
307 | if (inflateInit2(&rx_strm, -15) != Z_OK) { | |
308 | rprintf(FERROR, "inflate init failed\n"); | |
65417579 | 309 | exit_cleanup(RERR_STREAMIO); |
5914bf15 | 310 | } |
58cadc86 WD |
311 | if (!(cbuf = new_array(char, MAX_DATA_COUNT)) |
312 | || !(dbuf = new_array(char, AVAIL_OUT_SIZE(CHUNK_SIZE)))) | |
5914bf15 PM |
313 | out_of_memory("recv_deflated_token"); |
314 | init_done = 1; | |
315 | } else { | |
316 | inflateReset(&rx_strm); | |
317 | } | |
b8d4524b | 318 | recv_state = r_idle; |
5914bf15 PM |
319 | rx_token = 0; |
320 | break; | |
321 | ||
322 | case r_idle: | |
323 | case r_inflated: | |
324 | if (saved_flag) { | |
325 | flag = saved_flag & 0xff; | |
326 | saved_flag = 0; | |
327 | } else | |
328 | flag = read_byte(f); | |
329 | if ((flag & 0xC0) == DEFLATED_DATA) { | |
330 | n = ((flag & 0x3f) << 8) + read_byte(f); | |
331 | read_buf(f, cbuf, n); | |
332 | rx_strm.next_in = (Bytef *)cbuf; | |
333 | rx_strm.avail_in = n; | |
334 | recv_state = r_inflating; | |
335 | break; | |
336 | } | |
337 | if (recv_state == r_inflated) { | |
338 | /* check previous inflated stuff ended correctly */ | |
339 | rx_strm.avail_in = 0; | |
340 | rx_strm.next_out = (Bytef *)dbuf; | |
1dbb94ca | 341 | rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE); |
5914bf15 | 342 | r = inflate(&rx_strm, Z_SYNC_FLUSH); |
1dbb94ca | 343 | n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out; |
5914bf15 PM |
344 | /* |
345 | * Z_BUF_ERROR just means no progress was | |
346 | * made, i.e. the decompressor didn't have | |
347 | * any pending output for us. | |
348 | */ | |
349 | if (r != Z_OK && r != Z_BUF_ERROR) { | |
350 | rprintf(FERROR, "inflate flush returned %d (%d bytes)\n", | |
351 | r, n); | |
65417579 | 352 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
353 | } |
354 | if (n != 0 && r != Z_BUF_ERROR) { | |
355 | /* have to return some more data and | |
356 | save the flag for later. */ | |
357 | saved_flag = flag + 0x10000; | |
358 | *data = dbuf; | |
359 | return n; | |
360 | } | |
361 | /* | |
362 | * At this point the decompressor should | |
363 | * be expecting to see the 0, 0, ff, ff bytes. | |
364 | */ | |
365 | if (!inflateSyncPoint(&rx_strm)) { | |
366 | rprintf(FERROR, "decompressor lost sync!\n"); | |
65417579 | 367 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
368 | } |
369 | rx_strm.avail_in = 4; | |
370 | rx_strm.next_in = (Bytef *)cbuf; | |
371 | cbuf[0] = cbuf[1] = 0; | |
372 | cbuf[2] = cbuf[3] = 0xff; | |
373 | inflate(&rx_strm, Z_SYNC_FLUSH); | |
374 | recv_state = r_idle; | |
375 | } | |
376 | if (flag == END_FLAG) { | |
377 | /* that's all folks */ | |
378 | recv_state = r_init; | |
379 | return 0; | |
380 | } | |
381 | ||
382 | /* here we have a token of some kind */ | |
383 | if (flag & TOKEN_REL) { | |
384 | rx_token += flag & 0x3f; | |
385 | flag >>= 6; | |
386 | } else | |
387 | rx_token = read_int(f); | |
388 | if (flag & 1) { | |
389 | rx_run = read_byte(f); | |
390 | rx_run += read_byte(f) << 8; | |
391 | recv_state = r_running; | |
392 | } | |
393 | return -1 - rx_token; | |
394 | ||
395 | case r_inflating: | |
396 | rx_strm.next_out = (Bytef *)dbuf; | |
1dbb94ca | 397 | rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE); |
5914bf15 | 398 | r = inflate(&rx_strm, Z_NO_FLUSH); |
1dbb94ca | 399 | n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out; |
5914bf15 PM |
400 | if (r != Z_OK) { |
401 | rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n); | |
65417579 | 402 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
403 | } |
404 | if (rx_strm.avail_in == 0) | |
405 | recv_state = r_inflated; | |
406 | if (n != 0) { | |
407 | *data = dbuf; | |
408 | return n; | |
409 | } | |
410 | break; | |
411 | ||
412 | case r_running: | |
413 | ++rx_token; | |
414 | if (--rx_run == 0) | |
415 | recv_state = r_idle; | |
416 | return -1 - rx_token; | |
b8d4524b | 417 | } |
861c20b4 | 418 | } |
861c20b4 PM |
419 | } |
420 | ||
421 | /* | |
422 | * put the data corresponding to a token that we've just returned | |
423 | * from recv_deflated_token into the decompressor's history buffer. | |
424 | */ | |
6e4fb64e | 425 | static void see_deflate_token(char *buf, int len) |
861c20b4 | 426 | { |
5914bf15 PM |
427 | int r, blklen; |
428 | unsigned char hdr[5]; | |
429 | ||
430 | rx_strm.avail_in = 0; | |
431 | blklen = 0; | |
432 | hdr[0] = 0; | |
433 | do { | |
434 | if (rx_strm.avail_in == 0 && len != 0) { | |
435 | if (blklen == 0) { | |
436 | /* Give it a fake stored-block header. */ | |
437 | rx_strm.next_in = (Bytef *)hdr; | |
438 | rx_strm.avail_in = 5; | |
439 | blklen = len; | |
440 | if (blklen > 0xffff) | |
441 | blklen = 0xffff; | |
442 | hdr[1] = blklen; | |
443 | hdr[2] = blklen >> 8; | |
444 | hdr[3] = ~hdr[1]; | |
445 | hdr[4] = ~hdr[2]; | |
446 | } else { | |
447 | rx_strm.next_in = (Bytef *)buf; | |
448 | rx_strm.avail_in = blklen; | |
449 | len -= blklen; | |
450 | blklen = 0; | |
451 | } | |
452 | } | |
453 | rx_strm.next_out = (Bytef *)dbuf; | |
1dbb94ca | 454 | rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE); |
5914bf15 PM |
455 | r = inflate(&rx_strm, Z_SYNC_FLUSH); |
456 | if (r != Z_OK) { | |
457 | rprintf(FERROR, "inflate (token) returned %d\n", r); | |
65417579 | 458 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
459 | } |
460 | } while (len || rx_strm.avail_out == 0); | |
861c20b4 | 461 | } |
70d794dc | 462 | |
79f671cc MP |
463 | /** |
464 | * Transmit a verbatim buffer of length @p n followed by a token. | |
d67c8bdf | 465 | * If token == -1 then we have reached EOF |
70d794dc | 466 | * If n == 0 then don't send a buffer |
70d794dc | 467 | */ |
45f133b9 | 468 | void send_token(int f,int token,struct map_struct *buf,OFF_T offset, |
9e31c482 | 469 | int n,int toklen) |
70d794dc | 470 | { |
5914bf15 PM |
471 | if (!do_compression) { |
472 | simple_send_token(f,token,buf,offset,n); | |
473 | } else { | |
474 | send_deflated_token(f, token, buf, offset, n, toklen); | |
475 | } | |
70d794dc AT |
476 | } |
477 | ||
478 | ||
479 | /* | |
480 | * receive a token or buffer from the other end. If the reurn value is >0 then | |
481 | * it is a data buffer of that length, and *data will point at the data. | |
482 | * if the return value is -i then it represents token i-1 | |
483 | * if the return value is 0 then the end has been reached | |
484 | */ | |
485 | int recv_token(int f,char **data) | |
486 | { | |
5914bf15 PM |
487 | int tok; |
488 | ||
489 | if (!do_compression) { | |
490 | tok = simple_recv_token(f,data); | |
491 | } else { | |
492 | tok = recv_deflated_token(f, data); | |
493 | } | |
494 | return tok; | |
861c20b4 PM |
495 | } |
496 | ||
497 | /* | |
498 | * look at the data corresponding to a token, if necessary | |
499 | */ | |
500 | void see_token(char *data, int toklen) | |
501 | { | |
5914bf15 PM |
502 | if (do_compression) |
503 | see_deflate_token(data, toklen); | |
70d794dc | 504 | } |