Commit | Line | Data |
---|---|---|
70d794dc AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1996 | |
3 | Copyright (C) Paul Mackerras 1996 | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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; | |
83fff1aa | 24 | static int compression_level = Z_DEFAULT_COMPRESSION; |
70d794dc | 25 | |
83fff1aa AT |
26 | /* determine the compression level based on a wildcard filename list */ |
27 | void set_compression(char *fname) | |
28 | { | |
29 | extern int module_id; | |
30 | char *dont; | |
31 | char *tok; | |
32 | ||
33 | if (!do_compression) return; | |
34 | ||
63f0774f | 35 | compression_level = Z_DEFAULT_COMPRESSION; |
83fff1aa AT |
36 | dont = lp_dont_compress(module_id); |
37 | ||
38 | if (!dont || !*dont) return; | |
39 | ||
63f0774f DD |
40 | if ((dont[0] == '*') && (!dont[1])) { |
41 | /* an optimization to skip the rest of this routine */ | |
42 | compression_level = 0; | |
43 | return; | |
44 | } | |
45 | ||
83fff1aa AT |
46 | dont = strdup(dont); |
47 | fname = strdup(fname); | |
48 | if (!dont || !fname) return; | |
49 | ||
50 | strlower(dont); | |
51 | strlower(fname); | |
52 | ||
53 | for (tok=strtok(dont," ");tok;tok=strtok(NULL," ")) { | |
54 | if (fnmatch(tok, fname, 0) == 0) { | |
55 | compression_level = 0; | |
56 | break; | |
57 | } | |
58 | } | |
59 | free(dont); | |
60 | free(fname); | |
61 | } | |
70d794dc AT |
62 | |
63 | /* non-compressing recv token */ | |
64 | static int simple_recv_token(int f,char **data) | |
65 | { | |
c5eb3650 AT |
66 | static int residue; |
67 | static char *buf; | |
68 | int n; | |
70d794dc | 69 | |
c5eb3650 AT |
70 | if (!buf) { |
71 | buf = (char *)malloc(CHUNK_SIZE); | |
72 | if (!buf) out_of_memory("simple_recv_token"); | |
73 | } | |
70d794dc | 74 | |
c5eb3650 AT |
75 | if (residue == 0) { |
76 | int i = read_int(f); | |
77 | if (i <= 0) return i; | |
78 | residue = i; | |
79 | } | |
70d794dc | 80 | |
c5eb3650 AT |
81 | *data = buf; |
82 | n = MIN(CHUNK_SIZE,residue); | |
83 | residue -= n; | |
84 | read_buf(f,buf,n); | |
85 | return n; | |
70d794dc AT |
86 | } |
87 | ||
88 | ||
89 | /* non-compressing send token */ | |
c6e7fcb4 | 90 | static void simple_send_token(int f,int token, |
45f133b9 | 91 | struct map_struct *buf,OFF_T offset,int n) |
70d794dc | 92 | { |
6902ed17 MP |
93 | extern int write_batch; /* dw */ |
94 | int hold_int; /* dw */ | |
95 | ||
c5eb3650 AT |
96 | if (n > 0) { |
97 | int l = 0; | |
98 | while (l < n) { | |
99 | int n1 = MIN(CHUNK_SIZE,n-l); | |
100 | write_int(f,n1); | |
101 | write_buf(f,map_ptr(buf,offset+l,n1),n1); | |
6902ed17 MP |
102 | if (write_batch) { |
103 | write_batch_delta_file( (char *) &n1, sizeof(int) ); | |
104 | write_batch_delta_file(map_ptr(buf,offset+l,n1),n1); | |
105 | } | |
c5eb3650 AT |
106 | l += n1; |
107 | } | |
108 | } | |
45f133b9 AT |
109 | /* a -2 token means to send data only and no token */ |
110 | if (token != -2) { | |
111 | write_int(f,-(token+1)); | |
6902ed17 MP |
112 | if (write_batch) { |
113 | hold_int = -(token+1); | |
114 | write_batch_delta_file( (char *) &hold_int, sizeof(int) ); | |
115 | } | |
45f133b9 | 116 | } |
70d794dc AT |
117 | } |
118 | ||
119 | ||
861c20b4 PM |
120 | /* Flag bytes in compressed stream are encoded as follows: */ |
121 | #define END_FLAG 0 /* that's all folks */ | |
122 | #define TOKEN_LONG 0x20 /* followed by 32-bit token number */ | |
123 | #define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */ | |
124 | #define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */ | |
125 | #define TOKEN_REL 0x80 /* + 6-bit relative token number */ | |
126 | #define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */ | |
127 | ||
128 | #define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */ | |
129 | ||
130 | /* For coding runs of tokens */ | |
131 | static int last_token = -1; | |
132 | static int run_start; | |
133 | static int last_run_end; | |
134 | ||
135 | /* Deflation state */ | |
136 | static z_stream tx_strm; | |
137 | ||
138 | /* Output buffer */ | |
3a6a366f | 139 | static char *obuf; |
92b8abfe | 140 | static int obuf_size; |
861c20b4 PM |
141 | |
142 | /* Send a deflated token */ | |
143 | static void | |
144 | send_deflated_token(int f, int token, | |
45f133b9 | 145 | struct map_struct *buf, OFF_T offset, int nb, int toklen) |
861c20b4 | 146 | { |
5914bf15 PM |
147 | int n, r; |
148 | static int init_done, flush_pending; | |
6902ed17 MP |
149 | extern int write_batch; /* dw */ |
150 | char temp_byte; /* dw */ | |
5914bf15 PM |
151 | |
152 | if (last_token == -1) { | |
153 | /* initialization */ | |
154 | if (!init_done) { | |
155 | tx_strm.next_in = NULL; | |
156 | tx_strm.zalloc = NULL; | |
157 | tx_strm.zfree = NULL; | |
83fff1aa | 158 | if (deflateInit2(&tx_strm, compression_level, |
5914bf15 PM |
159 | Z_DEFLATED, -15, 8, |
160 | Z_DEFAULT_STRATEGY) != Z_OK) { | |
161 | rprintf(FERROR, "compression init failed\n"); | |
65417579 | 162 | exit_cleanup(RERR_STREAMIO); |
5914bf15 | 163 | } |
92b8abfe WD |
164 | #if MAX_DATA_COUNT+2 > CHUNK_SIZE+128 /* this shouldn't ever happen... */ |
165 | obuf_size = MAX_DATA_COUNT+2; | |
166 | #else | |
167 | obuf_size = CHUNK_SIZE+128; | |
168 | #endif | |
169 | if ((obuf = malloc(obuf_size)) == NULL) | |
5914bf15 PM |
170 | out_of_memory("send_deflated_token"); |
171 | init_done = 1; | |
172 | } else | |
173 | deflateReset(&tx_strm); | |
174 | last_run_end = 0; | |
175 | run_start = token; | |
176 | flush_pending = 0; | |
177 | ||
178 | } else if (last_token == -2) { | |
179 | run_start = token; | |
180 | ||
181 | } else if (nb != 0 || token != last_token + 1 | |
182 | || token >= run_start + 65536) { | |
183 | /* output previous run */ | |
184 | r = run_start - last_run_end; | |
185 | n = last_token - run_start; | |
186 | if (r >= 0 && r <= 63) { | |
187 | write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r); | |
6902ed17 MP |
188 | if (write_batch) { /* dw */ |
189 | temp_byte = (char)( (n==0? TOKEN_REL: TOKENRUN_REL) + r); | |
190 | write_batch_delta_file(&temp_byte,sizeof(char)); | |
191 | } | |
5914bf15 PM |
192 | } else { |
193 | write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG)); | |
194 | write_int(f, run_start); | |
6902ed17 MP |
195 | if (write_batch) { /* dw */ |
196 | temp_byte = (char)(n==0? TOKEN_LONG: TOKENRUN_LONG); | |
197 | write_batch_delta_file(&temp_byte,sizeof(temp_byte)); | |
198 | write_batch_delta_file((char *)&run_start,sizeof(run_start)); | |
199 | } | |
5914bf15 PM |
200 | } |
201 | if (n != 0) { | |
202 | write_byte(f, n); | |
203 | write_byte(f, n >> 8); | |
6902ed17 MP |
204 | if (write_batch) { /* dw */ |
205 | write_batch_delta_file((char *)&n,sizeof(char)); | |
206 | temp_byte = (char) n >> 8; | |
207 | write_batch_delta_file(&temp_byte,sizeof(temp_byte)); | |
208 | } | |
5914bf15 PM |
209 | } |
210 | last_run_end = last_token; | |
211 | run_start = token; | |
861c20b4 | 212 | } |
5914bf15 PM |
213 | |
214 | last_token = token; | |
215 | ||
216 | if (nb != 0 || flush_pending) { | |
217 | /* deflate the data starting at offset */ | |
218 | int flush = Z_NO_FLUSH; | |
219 | tx_strm.avail_in = 0; | |
220 | tx_strm.avail_out = 0; | |
221 | do { | |
222 | if (tx_strm.avail_in == 0 && nb != 0) { | |
223 | /* give it some more input */ | |
224 | n = MIN(nb, CHUNK_SIZE); | |
225 | tx_strm.next_in = (Bytef *) | |
226 | map_ptr(buf, offset, n); | |
227 | tx_strm.avail_in = n; | |
228 | nb -= n; | |
229 | offset += n; | |
230 | } | |
231 | if (tx_strm.avail_out == 0) { | |
232 | tx_strm.next_out = (Bytef *)(obuf + 2); | |
233 | tx_strm.avail_out = MAX_DATA_COUNT; | |
234 | if (flush != Z_NO_FLUSH) { | |
235 | /* | |
236 | * We left the last 4 bytes in the | |
237 | * buffer, in case they are the | |
238 | * last 4. Move them to the front. | |
239 | */ | |
240 | memcpy(tx_strm.next_out, | |
241 | obuf+MAX_DATA_COUNT-2, 4); | |
242 | tx_strm.next_out += 4; | |
243 | tx_strm.avail_out -= 4; | |
244 | } | |
245 | } | |
246 | if (nb == 0 && token != -2) | |
247 | flush = Z_SYNC_FLUSH; | |
248 | r = deflate(&tx_strm, flush); | |
249 | if (r != Z_OK) { | |
250 | rprintf(FERROR, "deflate returned %d\n", r); | |
65417579 | 251 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
252 | } |
253 | if (nb == 0 || tx_strm.avail_out == 0) { | |
254 | n = MAX_DATA_COUNT - tx_strm.avail_out; | |
255 | if (flush != Z_NO_FLUSH) { | |
256 | /* | |
257 | * We have to trim off the last 4 | |
258 | * bytes of output when flushing | |
259 | * (they are just 0, 0, ff, ff). | |
260 | */ | |
261 | n -= 4; | |
262 | } | |
263 | if (n > 0) { | |
264 | obuf[0] = DEFLATED_DATA + (n >> 8); | |
265 | obuf[1] = n; | |
266 | write_buf(f, obuf, n+2); | |
6902ed17 MP |
267 | if (write_batch) /* dw */ |
268 | write_batch_delta_file(obuf,n+2); | |
5914bf15 PM |
269 | } |
270 | } | |
271 | } while (nb != 0 || tx_strm.avail_out == 0); | |
272 | flush_pending = token == -2; | |
861c20b4 | 273 | } |
861c20b4 | 274 | |
5914bf15 PM |
275 | if (token == -1) { |
276 | /* end of file - clean up */ | |
277 | write_byte(f, END_FLAG); | |
6902ed17 MP |
278 | if (write_batch) { /* dw */ |
279 | temp_byte = END_FLAG; | |
280 | write_batch_delta_file((char *)&temp_byte,sizeof(temp_byte)); | |
281 | } | |
861c20b4 | 282 | |
5914bf15 PM |
283 | } else if (token != -2) { |
284 | /* add the data in the current block to the compressor's | |
285 | history and hash table */ | |
286 | tx_strm.next_in = (Bytef *) map_ptr(buf, offset, toklen); | |
287 | tx_strm.avail_in = toklen; | |
288 | tx_strm.next_out = (Bytef *) obuf; | |
92b8abfe | 289 | tx_strm.avail_out = obuf_size; |
5914bf15 PM |
290 | r = deflate(&tx_strm, Z_INSERT_ONLY); |
291 | if (r != Z_OK || tx_strm.avail_in != 0) { | |
292 | rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n", | |
293 | r, tx_strm.avail_in); | |
65417579 | 294 | exit_cleanup(RERR_STREAMIO); |
861c20b4 | 295 | } |
861c20b4 | 296 | } |
861c20b4 PM |
297 | } |
298 | ||
299 | ||
300 | /* tells us what the receiver is in the middle of doing */ | |
301 | static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state; | |
70d794dc | 302 | |
861c20b4 PM |
303 | /* for inflating stuff */ |
304 | static z_stream rx_strm; | |
305 | static char *cbuf; | |
306 | static char *dbuf; | |
307 | ||
308 | /* for decoding runs of tokens */ | |
309 | static int rx_token; | |
310 | static int rx_run; | |
311 | ||
312 | /* Receive a deflated token and inflate it */ | |
313 | static int | |
314 | recv_deflated_token(int f, char **data) | |
315 | { | |
5914bf15 PM |
316 | int n, r, flag; |
317 | static int init_done; | |
318 | static int saved_flag; | |
319 | ||
320 | for (;;) { | |
321 | switch (recv_state) { | |
322 | case r_init: | |
323 | if (!init_done) { | |
324 | rx_strm.next_out = NULL; | |
325 | rx_strm.zalloc = NULL; | |
326 | rx_strm.zfree = NULL; | |
327 | if (inflateInit2(&rx_strm, -15) != Z_OK) { | |
328 | rprintf(FERROR, "inflate init failed\n"); | |
65417579 | 329 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
330 | } |
331 | if ((cbuf = malloc(MAX_DATA_COUNT)) == NULL | |
332 | || (dbuf = malloc(CHUNK_SIZE)) == NULL) | |
333 | out_of_memory("recv_deflated_token"); | |
334 | init_done = 1; | |
335 | } else { | |
336 | inflateReset(&rx_strm); | |
337 | } | |
b8d4524b | 338 | recv_state = r_idle; |
5914bf15 PM |
339 | rx_token = 0; |
340 | break; | |
341 | ||
342 | case r_idle: | |
343 | case r_inflated: | |
344 | if (saved_flag) { | |
345 | flag = saved_flag & 0xff; | |
346 | saved_flag = 0; | |
347 | } else | |
348 | flag = read_byte(f); | |
349 | if ((flag & 0xC0) == DEFLATED_DATA) { | |
350 | n = ((flag & 0x3f) << 8) + read_byte(f); | |
351 | read_buf(f, cbuf, n); | |
352 | rx_strm.next_in = (Bytef *)cbuf; | |
353 | rx_strm.avail_in = n; | |
354 | recv_state = r_inflating; | |
355 | break; | |
356 | } | |
357 | if (recv_state == r_inflated) { | |
358 | /* check previous inflated stuff ended correctly */ | |
359 | rx_strm.avail_in = 0; | |
360 | rx_strm.next_out = (Bytef *)dbuf; | |
361 | rx_strm.avail_out = CHUNK_SIZE; | |
362 | r = inflate(&rx_strm, Z_SYNC_FLUSH); | |
363 | n = CHUNK_SIZE - rx_strm.avail_out; | |
364 | /* | |
365 | * Z_BUF_ERROR just means no progress was | |
366 | * made, i.e. the decompressor didn't have | |
367 | * any pending output for us. | |
368 | */ | |
369 | if (r != Z_OK && r != Z_BUF_ERROR) { | |
370 | rprintf(FERROR, "inflate flush returned %d (%d bytes)\n", | |
371 | r, n); | |
65417579 | 372 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
373 | } |
374 | if (n != 0 && r != Z_BUF_ERROR) { | |
375 | /* have to return some more data and | |
376 | save the flag for later. */ | |
377 | saved_flag = flag + 0x10000; | |
378 | *data = dbuf; | |
379 | return n; | |
380 | } | |
381 | /* | |
382 | * At this point the decompressor should | |
383 | * be expecting to see the 0, 0, ff, ff bytes. | |
384 | */ | |
385 | if (!inflateSyncPoint(&rx_strm)) { | |
386 | rprintf(FERROR, "decompressor lost sync!\n"); | |
65417579 | 387 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
388 | } |
389 | rx_strm.avail_in = 4; | |
390 | rx_strm.next_in = (Bytef *)cbuf; | |
391 | cbuf[0] = cbuf[1] = 0; | |
392 | cbuf[2] = cbuf[3] = 0xff; | |
393 | inflate(&rx_strm, Z_SYNC_FLUSH); | |
394 | recv_state = r_idle; | |
395 | } | |
396 | if (flag == END_FLAG) { | |
397 | /* that's all folks */ | |
398 | recv_state = r_init; | |
399 | return 0; | |
400 | } | |
401 | ||
402 | /* here we have a token of some kind */ | |
403 | if (flag & TOKEN_REL) { | |
404 | rx_token += flag & 0x3f; | |
405 | flag >>= 6; | |
406 | } else | |
407 | rx_token = read_int(f); | |
408 | if (flag & 1) { | |
409 | rx_run = read_byte(f); | |
410 | rx_run += read_byte(f) << 8; | |
411 | recv_state = r_running; | |
412 | } | |
413 | return -1 - rx_token; | |
414 | ||
415 | case r_inflating: | |
416 | rx_strm.next_out = (Bytef *)dbuf; | |
417 | rx_strm.avail_out = CHUNK_SIZE; | |
418 | r = inflate(&rx_strm, Z_NO_FLUSH); | |
419 | n = CHUNK_SIZE - rx_strm.avail_out; | |
420 | if (r != Z_OK) { | |
421 | rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n); | |
65417579 | 422 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
423 | } |
424 | if (rx_strm.avail_in == 0) | |
425 | recv_state = r_inflated; | |
426 | if (n != 0) { | |
427 | *data = dbuf; | |
428 | return n; | |
429 | } | |
430 | break; | |
431 | ||
432 | case r_running: | |
433 | ++rx_token; | |
434 | if (--rx_run == 0) | |
435 | recv_state = r_idle; | |
436 | return -1 - rx_token; | |
b8d4524b | 437 | } |
861c20b4 | 438 | } |
861c20b4 PM |
439 | } |
440 | ||
441 | /* | |
442 | * put the data corresponding to a token that we've just returned | |
443 | * from recv_deflated_token into the decompressor's history buffer. | |
444 | */ | |
6e4fb64e | 445 | static void see_deflate_token(char *buf, int len) |
861c20b4 | 446 | { |
5914bf15 PM |
447 | int r, blklen; |
448 | unsigned char hdr[5]; | |
449 | ||
450 | rx_strm.avail_in = 0; | |
451 | blklen = 0; | |
452 | hdr[0] = 0; | |
453 | do { | |
454 | if (rx_strm.avail_in == 0 && len != 0) { | |
455 | if (blklen == 0) { | |
456 | /* Give it a fake stored-block header. */ | |
457 | rx_strm.next_in = (Bytef *)hdr; | |
458 | rx_strm.avail_in = 5; | |
459 | blklen = len; | |
460 | if (blklen > 0xffff) | |
461 | blklen = 0xffff; | |
462 | hdr[1] = blklen; | |
463 | hdr[2] = blklen >> 8; | |
464 | hdr[3] = ~hdr[1]; | |
465 | hdr[4] = ~hdr[2]; | |
466 | } else { | |
467 | rx_strm.next_in = (Bytef *)buf; | |
468 | rx_strm.avail_in = blklen; | |
469 | len -= blklen; | |
470 | blklen = 0; | |
471 | } | |
472 | } | |
473 | rx_strm.next_out = (Bytef *)dbuf; | |
474 | rx_strm.avail_out = CHUNK_SIZE; | |
475 | r = inflate(&rx_strm, Z_SYNC_FLUSH); | |
476 | if (r != Z_OK) { | |
477 | rprintf(FERROR, "inflate (token) returned %d\n", r); | |
65417579 | 478 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
479 | } |
480 | } while (len || rx_strm.avail_out == 0); | |
861c20b4 | 481 | } |
70d794dc | 482 | |
79f671cc MP |
483 | /** |
484 | * Transmit a verbatim buffer of length @p n followed by a token. | |
70d794dc AT |
485 | * If token == -1 then we have reached EOF |
486 | * If n == 0 then don't send a buffer | |
70d794dc | 487 | */ |
45f133b9 | 488 | void send_token(int f,int token,struct map_struct *buf,OFF_T offset, |
9e31c482 | 489 | int n,int toklen) |
70d794dc | 490 | { |
5914bf15 PM |
491 | if (!do_compression) { |
492 | simple_send_token(f,token,buf,offset,n); | |
493 | } else { | |
494 | send_deflated_token(f, token, buf, offset, n, toklen); | |
495 | } | |
70d794dc AT |
496 | } |
497 | ||
498 | ||
499 | /* | |
500 | * receive a token or buffer from the other end. If the reurn value is >0 then | |
501 | * it is a data buffer of that length, and *data will point at the data. | |
502 | * if the return value is -i then it represents token i-1 | |
503 | * if the return value is 0 then the end has been reached | |
504 | */ | |
505 | int recv_token(int f,char **data) | |
506 | { | |
5914bf15 PM |
507 | int tok; |
508 | ||
509 | if (!do_compression) { | |
510 | tok = simple_recv_token(f,data); | |
511 | } else { | |
512 | tok = recv_deflated_token(f, data); | |
513 | } | |
514 | return tok; | |
861c20b4 PM |
515 | } |
516 | ||
517 | /* | |
518 | * look at the data corresponding to a token, if necessary | |
519 | */ | |
520 | void see_token(char *data, int toklen) | |
521 | { | |
5914bf15 PM |
522 | if (do_compression) |
523 | see_deflate_token(data, toklen); | |
70d794dc | 524 | } |