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; |
e8a8167a | 25 | extern int def_compress_level; |
d67c8bdf | 26 | |
e8a8167a | 27 | static int compression_level; |
70d794dc | 28 | |
83fff1aa AT |
29 | /* determine the compression level based on a wildcard filename list */ |
30 | void set_compression(char *fname) | |
31 | { | |
83fff1aa AT |
32 | char *dont; |
33 | char *tok; | |
34 | ||
d67c8bdf WD |
35 | if (!do_compression) |
36 | return; | |
83fff1aa | 37 | |
e8a8167a | 38 | compression_level = def_compress_level; |
83fff1aa AT |
39 | dont = lp_dont_compress(module_id); |
40 | ||
d67c8bdf WD |
41 | if (!dont || !*dont) |
42 | return; | |
83fff1aa | 43 | |
d67c8bdf | 44 | if (dont[0] == '*' && !dont[1]) { |
63f0774f DD |
45 | /* an optimization to skip the rest of this routine */ |
46 | compression_level = 0; | |
47 | return; | |
48 | } | |
49 | ||
83fff1aa AT |
50 | dont = strdup(dont); |
51 | fname = strdup(fname); | |
d67c8bdf WD |
52 | if (!dont || !fname) |
53 | return; | |
83fff1aa AT |
54 | |
55 | strlower(dont); | |
56 | strlower(fname); | |
57 | ||
d67c8bdf | 58 | for (tok = strtok(dont, " "); tok; tok = strtok(NULL, " ")) { |
fe332038 | 59 | if (wildmatch(tok, fname)) { |
83fff1aa AT |
60 | compression_level = 0; |
61 | break; | |
62 | } | |
63 | } | |
64 | free(dont); | |
65 | free(fname); | |
66 | } | |
70d794dc AT |
67 | |
68 | /* non-compressing recv token */ | |
7fcbf9e4 | 69 | static int32 simple_recv_token(int f, char **data) |
70d794dc | 70 | { |
acc461c7 | 71 | static int32 residue; |
c5eb3650 | 72 | static char *buf; |
7fcbf9e4 | 73 | int32 n; |
70d794dc | 74 | |
c5eb3650 | 75 | if (!buf) { |
58cadc86 | 76 | buf = new_array(char, CHUNK_SIZE); |
d67c8bdf WD |
77 | if (!buf) |
78 | out_of_memory("simple_recv_token"); | |
c5eb3650 | 79 | } |
70d794dc | 80 | |
c5eb3650 | 81 | if (residue == 0) { |
7fcbf9e4 | 82 | int32 i = read_int(f); |
d67c8bdf WD |
83 | if (i <= 0) |
84 | return i; | |
c5eb3650 AT |
85 | residue = i; |
86 | } | |
70d794dc | 87 | |
c5eb3650 AT |
88 | *data = buf; |
89 | n = MIN(CHUNK_SIZE,residue); | |
90 | residue -= n; | |
91 | read_buf(f,buf,n); | |
92 | return n; | |
70d794dc AT |
93 | } |
94 | ||
95 | ||
96 | /* non-compressing send token */ | |
acc461c7 | 97 | static void simple_send_token(int f, int32 token, struct map_struct *buf, |
7fcbf9e4 | 98 | OFF_T offset, int32 n) |
70d794dc | 99 | { |
c5eb3650 | 100 | if (n > 0) { |
7fcbf9e4 WD |
101 | int32 len = 0; |
102 | while (len < n) { | |
103 | int32 n1 = MIN(CHUNK_SIZE, n-len); | |
104 | write_int(f, n1); | |
105 | write_buf(f, map_ptr(buf, offset+len, n1), n1); | |
106 | len += n1; | |
c5eb3650 AT |
107 | } |
108 | } | |
45f133b9 | 109 | /* a -2 token means to send data only and no token */ |
7fcbf9e4 WD |
110 | if (token != -2) |
111 | write_int(f, -(token+1)); | |
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 | 131 | /* For coding runs of tokens */ |
acc461c7 WD |
132 | static int32 last_token = -1; |
133 | static int32 run_start; | |
134 | static int32 last_run_end; | |
861c20b4 PM |
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 | |
acc461c7 | 152 | send_deflated_token(int f, int32 token, struct map_struct *buf, OFF_T offset, |
7fcbf9e4 | 153 | int32 nb, int32 toklen) |
861c20b4 | 154 | { |
7fcbf9e4 | 155 | int32 n, r; |
5914bf15 PM |
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 | 263 | } else if (token != -2) { |
acc461c7 WD |
264 | /* Add the data in the current block to the compressor's |
265 | * history and hash table. */ | |
01f439ec WD |
266 | do { |
267 | /* Break up long sections in the same way that | |
268 | * see_deflate_token() does. */ | |
269 | int32 n1 = toklen > 0xffff ? 0xffff : toklen; | |
270 | toklen -= n1; | |
271 | tx_strm.next_in = (Bytef *)map_ptr(buf, offset, n1); | |
272 | tx_strm.avail_in = n1; | |
273 | tx_strm.next_out = (Bytef *) obuf; | |
274 | tx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE); | |
275 | r = deflate(&tx_strm, Z_INSERT_ONLY); | |
276 | if (r != Z_OK || tx_strm.avail_in != 0) { | |
277 | rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n", | |
278 | r, tx_strm.avail_in); | |
279 | exit_cleanup(RERR_STREAMIO); | |
280 | } | |
281 | } while (toklen > 0); | |
861c20b4 | 282 | } |
861c20b4 PM |
283 | } |
284 | ||
285 | ||
286 | /* tells us what the receiver is in the middle of doing */ | |
287 | static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state; | |
70d794dc | 288 | |
861c20b4 PM |
289 | /* for inflating stuff */ |
290 | static z_stream rx_strm; | |
291 | static char *cbuf; | |
292 | static char *dbuf; | |
293 | ||
294 | /* for decoding runs of tokens */ | |
7fcbf9e4 WD |
295 | static int32 rx_token; |
296 | static int32 rx_run; | |
861c20b4 PM |
297 | |
298 | /* Receive a deflated token and inflate it */ | |
7fcbf9e4 | 299 | static int32 recv_deflated_token(int f, char **data) |
861c20b4 | 300 | { |
5914bf15 | 301 | static int init_done; |
acc461c7 WD |
302 | static int32 saved_flag; |
303 | int32 n, flag; | |
304 | int r; | |
5914bf15 PM |
305 | |
306 | for (;;) { | |
307 | switch (recv_state) { | |
308 | case r_init: | |
309 | if (!init_done) { | |
310 | rx_strm.next_out = NULL; | |
311 | rx_strm.zalloc = NULL; | |
312 | rx_strm.zfree = NULL; | |
313 | if (inflateInit2(&rx_strm, -15) != Z_OK) { | |
314 | rprintf(FERROR, "inflate init failed\n"); | |
65417579 | 315 | exit_cleanup(RERR_STREAMIO); |
5914bf15 | 316 | } |
58cadc86 WD |
317 | if (!(cbuf = new_array(char, MAX_DATA_COUNT)) |
318 | || !(dbuf = new_array(char, AVAIL_OUT_SIZE(CHUNK_SIZE)))) | |
5914bf15 PM |
319 | out_of_memory("recv_deflated_token"); |
320 | init_done = 1; | |
321 | } else { | |
322 | inflateReset(&rx_strm); | |
323 | } | |
b8d4524b | 324 | recv_state = r_idle; |
5914bf15 PM |
325 | rx_token = 0; |
326 | break; | |
327 | ||
328 | case r_idle: | |
329 | case r_inflated: | |
330 | if (saved_flag) { | |
331 | flag = saved_flag & 0xff; | |
332 | saved_flag = 0; | |
333 | } else | |
334 | flag = read_byte(f); | |
335 | if ((flag & 0xC0) == DEFLATED_DATA) { | |
336 | n = ((flag & 0x3f) << 8) + read_byte(f); | |
337 | read_buf(f, cbuf, n); | |
338 | rx_strm.next_in = (Bytef *)cbuf; | |
339 | rx_strm.avail_in = n; | |
340 | recv_state = r_inflating; | |
341 | break; | |
342 | } | |
343 | if (recv_state == r_inflated) { | |
344 | /* check previous inflated stuff ended correctly */ | |
345 | rx_strm.avail_in = 0; | |
346 | rx_strm.next_out = (Bytef *)dbuf; | |
1dbb94ca | 347 | rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE); |
5914bf15 | 348 | r = inflate(&rx_strm, Z_SYNC_FLUSH); |
1dbb94ca | 349 | n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out; |
5914bf15 PM |
350 | /* |
351 | * Z_BUF_ERROR just means no progress was | |
352 | * made, i.e. the decompressor didn't have | |
353 | * any pending output for us. | |
354 | */ | |
355 | if (r != Z_OK && r != Z_BUF_ERROR) { | |
356 | rprintf(FERROR, "inflate flush returned %d (%d bytes)\n", | |
357 | r, n); | |
65417579 | 358 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
359 | } |
360 | if (n != 0 && r != Z_BUF_ERROR) { | |
361 | /* have to return some more data and | |
362 | save the flag for later. */ | |
363 | saved_flag = flag + 0x10000; | |
364 | *data = dbuf; | |
365 | return n; | |
366 | } | |
367 | /* | |
368 | * At this point the decompressor should | |
369 | * be expecting to see the 0, 0, ff, ff bytes. | |
370 | */ | |
371 | if (!inflateSyncPoint(&rx_strm)) { | |
372 | rprintf(FERROR, "decompressor lost sync!\n"); | |
65417579 | 373 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
374 | } |
375 | rx_strm.avail_in = 4; | |
376 | rx_strm.next_in = (Bytef *)cbuf; | |
377 | cbuf[0] = cbuf[1] = 0; | |
378 | cbuf[2] = cbuf[3] = 0xff; | |
379 | inflate(&rx_strm, Z_SYNC_FLUSH); | |
380 | recv_state = r_idle; | |
381 | } | |
382 | if (flag == END_FLAG) { | |
383 | /* that's all folks */ | |
384 | recv_state = r_init; | |
385 | return 0; | |
386 | } | |
387 | ||
388 | /* here we have a token of some kind */ | |
389 | if (flag & TOKEN_REL) { | |
390 | rx_token += flag & 0x3f; | |
391 | flag >>= 6; | |
392 | } else | |
393 | rx_token = read_int(f); | |
394 | if (flag & 1) { | |
395 | rx_run = read_byte(f); | |
396 | rx_run += read_byte(f) << 8; | |
397 | recv_state = r_running; | |
398 | } | |
399 | return -1 - rx_token; | |
400 | ||
401 | case r_inflating: | |
402 | rx_strm.next_out = (Bytef *)dbuf; | |
1dbb94ca | 403 | rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE); |
5914bf15 | 404 | r = inflate(&rx_strm, Z_NO_FLUSH); |
1dbb94ca | 405 | n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out; |
5914bf15 PM |
406 | if (r != Z_OK) { |
407 | rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n); | |
65417579 | 408 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
409 | } |
410 | if (rx_strm.avail_in == 0) | |
411 | recv_state = r_inflated; | |
412 | if (n != 0) { | |
413 | *data = dbuf; | |
414 | return n; | |
415 | } | |
416 | break; | |
417 | ||
418 | case r_running: | |
419 | ++rx_token; | |
420 | if (--rx_run == 0) | |
421 | recv_state = r_idle; | |
422 | return -1 - rx_token; | |
b8d4524b | 423 | } |
861c20b4 | 424 | } |
861c20b4 PM |
425 | } |
426 | ||
427 | /* | |
428 | * put the data corresponding to a token that we've just returned | |
429 | * from recv_deflated_token into the decompressor's history buffer. | |
430 | */ | |
7fcbf9e4 | 431 | static void see_deflate_token(char *buf, int32 len) |
861c20b4 | 432 | { |
acc461c7 WD |
433 | int r; |
434 | int32 blklen; | |
5914bf15 PM |
435 | unsigned char hdr[5]; |
436 | ||
437 | rx_strm.avail_in = 0; | |
438 | blklen = 0; | |
439 | hdr[0] = 0; | |
440 | do { | |
441 | if (rx_strm.avail_in == 0 && len != 0) { | |
442 | if (blklen == 0) { | |
443 | /* Give it a fake stored-block header. */ | |
444 | rx_strm.next_in = (Bytef *)hdr; | |
445 | rx_strm.avail_in = 5; | |
446 | blklen = len; | |
447 | if (blklen > 0xffff) | |
448 | blklen = 0xffff; | |
449 | hdr[1] = blklen; | |
450 | hdr[2] = blklen >> 8; | |
451 | hdr[3] = ~hdr[1]; | |
452 | hdr[4] = ~hdr[2]; | |
453 | } else { | |
454 | rx_strm.next_in = (Bytef *)buf; | |
455 | rx_strm.avail_in = blklen; | |
456 | len -= blklen; | |
457 | blklen = 0; | |
458 | } | |
459 | } | |
460 | rx_strm.next_out = (Bytef *)dbuf; | |
1dbb94ca | 461 | rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE); |
5914bf15 PM |
462 | r = inflate(&rx_strm, Z_SYNC_FLUSH); |
463 | if (r != Z_OK) { | |
464 | rprintf(FERROR, "inflate (token) returned %d\n", r); | |
65417579 | 465 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
466 | } |
467 | } while (len || rx_strm.avail_out == 0); | |
861c20b4 | 468 | } |
70d794dc | 469 | |
79f671cc MP |
470 | /** |
471 | * Transmit a verbatim buffer of length @p n followed by a token. | |
d67c8bdf | 472 | * If token == -1 then we have reached EOF |
70d794dc | 473 | * If n == 0 then don't send a buffer |
70d794dc | 474 | */ |
acc461c7 | 475 | void send_token(int f, int32 token, struct map_struct *buf, OFF_T offset, |
7fcbf9e4 | 476 | int32 n, int32 toklen) |
70d794dc | 477 | { |
7fcbf9e4 WD |
478 | if (!do_compression) |
479 | simple_send_token(f, token, buf, offset, n); | |
480 | else | |
5914bf15 | 481 | send_deflated_token(f, token, buf, offset, n, toklen); |
70d794dc AT |
482 | } |
483 | ||
484 | ||
485 | /* | |
486 | * receive a token or buffer from the other end. If the reurn value is >0 then | |
487 | * it is a data buffer of that length, and *data will point at the data. | |
488 | * if the return value is -i then it represents token i-1 | |
489 | * if the return value is 0 then the end has been reached | |
490 | */ | |
7fcbf9e4 | 491 | int32 recv_token(int f, char **data) |
70d794dc | 492 | { |
5914bf15 PM |
493 | int tok; |
494 | ||
495 | if (!do_compression) { | |
496 | tok = simple_recv_token(f,data); | |
497 | } else { | |
498 | tok = recv_deflated_token(f, data); | |
499 | } | |
500 | return tok; | |
861c20b4 PM |
501 | } |
502 | ||
503 | /* | |
504 | * look at the data corresponding to a token, if necessary | |
505 | */ | |
7fcbf9e4 | 506 | void see_token(char *data, int32 toklen) |
861c20b4 | 507 | { |
5914bf15 PM |
508 | if (do_compression) |
509 | see_deflate_token(data, toklen); | |
70d794dc | 510 | } |