Commit | Line | Data |
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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; | |
d47741ca | 24 | int default_compression_level = Z_DEFAULT_COMPRESSION; |
83fff1aa | 25 | static int compression_level = Z_DEFAULT_COMPRESSION; |
70d794dc | 26 | |
83fff1aa AT |
27 | /* determine the compression level based on a wildcard filename list */ |
28 | void set_compression(char *fname) | |
29 | { | |
30 | extern int module_id; | |
31 | char *dont; | |
32 | char *tok; | |
33 | ||
34 | if (!do_compression) return; | |
35 | ||
d47741ca | 36 | compression_level = default_compression_level; |
83fff1aa AT |
37 | dont = lp_dont_compress(module_id); |
38 | ||
39 | if (!dont || !*dont) return; | |
40 | ||
41 | dont = strdup(dont); | |
42 | fname = strdup(fname); | |
43 | if (!dont || !fname) return; | |
44 | ||
45 | strlower(dont); | |
46 | strlower(fname); | |
47 | ||
48 | for (tok=strtok(dont," ");tok;tok=strtok(NULL," ")) { | |
49 | if (fnmatch(tok, fname, 0) == 0) { | |
50 | compression_level = 0; | |
51 | break; | |
52 | } | |
53 | } | |
54 | free(dont); | |
55 | free(fname); | |
56 | } | |
70d794dc AT |
57 | |
58 | /* non-compressing recv token */ | |
59 | static int simple_recv_token(int f,char **data) | |
60 | { | |
c5eb3650 AT |
61 | static int residue; |
62 | static char *buf; | |
63 | int n; | |
70d794dc | 64 | |
c5eb3650 AT |
65 | if (!buf) { |
66 | buf = (char *)malloc(CHUNK_SIZE); | |
67 | if (!buf) out_of_memory("simple_recv_token"); | |
68 | } | |
70d794dc | 69 | |
c5eb3650 AT |
70 | if (residue == 0) { |
71 | int i = read_int(f); | |
72 | if (i <= 0) return i; | |
73 | residue = i; | |
74 | } | |
70d794dc | 75 | |
c5eb3650 AT |
76 | *data = buf; |
77 | n = MIN(CHUNK_SIZE,residue); | |
78 | residue -= n; | |
79 | read_buf(f,buf,n); | |
80 | return n; | |
70d794dc AT |
81 | } |
82 | ||
83 | ||
84 | /* non-compressing send token */ | |
c6e7fcb4 | 85 | static void simple_send_token(int f,int token, |
45f133b9 | 86 | struct map_struct *buf,OFF_T offset,int n) |
70d794dc | 87 | { |
c5eb3650 AT |
88 | if (n > 0) { |
89 | int l = 0; | |
90 | while (l < n) { | |
91 | int n1 = MIN(CHUNK_SIZE,n-l); | |
92 | write_int(f,n1); | |
93 | write_buf(f,map_ptr(buf,offset+l,n1),n1); | |
94 | l += n1; | |
95 | } | |
96 | } | |
45f133b9 AT |
97 | /* a -2 token means to send data only and no token */ |
98 | if (token != -2) { | |
99 | write_int(f,-(token+1)); | |
100 | } | |
70d794dc AT |
101 | } |
102 | ||
103 | ||
861c20b4 PM |
104 | /* Flag bytes in compressed stream are encoded as follows: */ |
105 | #define END_FLAG 0 /* that's all folks */ | |
106 | #define TOKEN_LONG 0x20 /* followed by 32-bit token number */ | |
107 | #define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */ | |
108 | #define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */ | |
109 | #define TOKEN_REL 0x80 /* + 6-bit relative token number */ | |
110 | #define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */ | |
111 | ||
112 | #define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */ | |
113 | ||
114 | /* For coding runs of tokens */ | |
115 | static int last_token = -1; | |
116 | static int run_start; | |
117 | static int last_run_end; | |
118 | ||
119 | /* Deflation state */ | |
120 | static z_stream tx_strm; | |
121 | ||
122 | /* Output buffer */ | |
3a6a366f | 123 | static char *obuf; |
861c20b4 PM |
124 | |
125 | /* Send a deflated token */ | |
126 | static void | |
127 | send_deflated_token(int f, int token, | |
45f133b9 | 128 | struct map_struct *buf, OFF_T offset, int nb, int toklen) |
861c20b4 | 129 | { |
5914bf15 PM |
130 | int n, r; |
131 | static int init_done, flush_pending; | |
132 | ||
133 | if (last_token == -1) { | |
134 | /* initialization */ | |
135 | if (!init_done) { | |
136 | tx_strm.next_in = NULL; | |
137 | tx_strm.zalloc = NULL; | |
138 | tx_strm.zfree = NULL; | |
83fff1aa | 139 | if (deflateInit2(&tx_strm, compression_level, |
5914bf15 PM |
140 | Z_DEFLATED, -15, 8, |
141 | Z_DEFAULT_STRATEGY) != Z_OK) { | |
142 | rprintf(FERROR, "compression init failed\n"); | |
65417579 | 143 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
144 | } |
145 | if ((obuf = malloc(MAX_DATA_COUNT+2)) == NULL) | |
146 | out_of_memory("send_deflated_token"); | |
147 | init_done = 1; | |
148 | } else | |
149 | deflateReset(&tx_strm); | |
150 | last_run_end = 0; | |
151 | run_start = token; | |
152 | flush_pending = 0; | |
153 | ||
154 | } else if (last_token == -2) { | |
155 | run_start = token; | |
156 | ||
157 | } else if (nb != 0 || token != last_token + 1 | |
158 | || token >= run_start + 65536) { | |
159 | /* output previous run */ | |
160 | r = run_start - last_run_end; | |
161 | n = last_token - run_start; | |
162 | if (r >= 0 && r <= 63) { | |
163 | write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r); | |
164 | } else { | |
165 | write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG)); | |
166 | write_int(f, run_start); | |
167 | } | |
168 | if (n != 0) { | |
169 | write_byte(f, n); | |
170 | write_byte(f, n >> 8); | |
171 | } | |
172 | last_run_end = last_token; | |
173 | run_start = token; | |
861c20b4 | 174 | } |
5914bf15 PM |
175 | |
176 | last_token = token; | |
177 | ||
178 | if (nb != 0 || flush_pending) { | |
179 | /* deflate the data starting at offset */ | |
180 | int flush = Z_NO_FLUSH; | |
181 | tx_strm.avail_in = 0; | |
182 | tx_strm.avail_out = 0; | |
183 | do { | |
184 | if (tx_strm.avail_in == 0 && nb != 0) { | |
185 | /* give it some more input */ | |
186 | n = MIN(nb, CHUNK_SIZE); | |
187 | tx_strm.next_in = (Bytef *) | |
188 | map_ptr(buf, offset, n); | |
189 | tx_strm.avail_in = n; | |
190 | nb -= n; | |
191 | offset += n; | |
192 | } | |
193 | if (tx_strm.avail_out == 0) { | |
194 | tx_strm.next_out = (Bytef *)(obuf + 2); | |
195 | tx_strm.avail_out = MAX_DATA_COUNT; | |
196 | if (flush != Z_NO_FLUSH) { | |
197 | /* | |
198 | * We left the last 4 bytes in the | |
199 | * buffer, in case they are the | |
200 | * last 4. Move them to the front. | |
201 | */ | |
202 | memcpy(tx_strm.next_out, | |
203 | obuf+MAX_DATA_COUNT-2, 4); | |
204 | tx_strm.next_out += 4; | |
205 | tx_strm.avail_out -= 4; | |
206 | } | |
207 | } | |
208 | if (nb == 0 && token != -2) | |
209 | flush = Z_SYNC_FLUSH; | |
210 | r = deflate(&tx_strm, flush); | |
211 | if (r != Z_OK) { | |
212 | rprintf(FERROR, "deflate returned %d\n", r); | |
65417579 | 213 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
214 | } |
215 | if (nb == 0 || tx_strm.avail_out == 0) { | |
216 | n = MAX_DATA_COUNT - tx_strm.avail_out; | |
217 | if (flush != Z_NO_FLUSH) { | |
218 | /* | |
219 | * We have to trim off the last 4 | |
220 | * bytes of output when flushing | |
221 | * (they are just 0, 0, ff, ff). | |
222 | */ | |
223 | n -= 4; | |
224 | } | |
225 | if (n > 0) { | |
226 | obuf[0] = DEFLATED_DATA + (n >> 8); | |
227 | obuf[1] = n; | |
228 | write_buf(f, obuf, n+2); | |
229 | } | |
230 | } | |
231 | } while (nb != 0 || tx_strm.avail_out == 0); | |
232 | flush_pending = token == -2; | |
861c20b4 | 233 | } |
861c20b4 | 234 | |
5914bf15 PM |
235 | if (token == -1) { |
236 | /* end of file - clean up */ | |
237 | write_byte(f, END_FLAG); | |
861c20b4 | 238 | |
5914bf15 PM |
239 | } else if (token != -2) { |
240 | /* add the data in the current block to the compressor's | |
241 | history and hash table */ | |
242 | tx_strm.next_in = (Bytef *) map_ptr(buf, offset, toklen); | |
243 | tx_strm.avail_in = toklen; | |
244 | tx_strm.next_out = (Bytef *) obuf; | |
861c20b4 | 245 | tx_strm.avail_out = MAX_DATA_COUNT; |
5914bf15 PM |
246 | r = deflate(&tx_strm, Z_INSERT_ONLY); |
247 | if (r != Z_OK || tx_strm.avail_in != 0) { | |
248 | rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n", | |
249 | r, tx_strm.avail_in); | |
65417579 | 250 | exit_cleanup(RERR_STREAMIO); |
861c20b4 | 251 | } |
861c20b4 | 252 | } |
861c20b4 PM |
253 | } |
254 | ||
255 | ||
256 | /* tells us what the receiver is in the middle of doing */ | |
257 | static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state; | |
70d794dc | 258 | |
861c20b4 PM |
259 | /* for inflating stuff */ |
260 | static z_stream rx_strm; | |
261 | static char *cbuf; | |
262 | static char *dbuf; | |
263 | ||
264 | /* for decoding runs of tokens */ | |
265 | static int rx_token; | |
266 | static int rx_run; | |
267 | ||
268 | /* Receive a deflated token and inflate it */ | |
269 | static int | |
270 | recv_deflated_token(int f, char **data) | |
271 | { | |
5914bf15 PM |
272 | int n, r, flag; |
273 | static int init_done; | |
274 | static int saved_flag; | |
275 | ||
276 | for (;;) { | |
277 | switch (recv_state) { | |
278 | case r_init: | |
279 | if (!init_done) { | |
280 | rx_strm.next_out = NULL; | |
281 | rx_strm.zalloc = NULL; | |
282 | rx_strm.zfree = NULL; | |
283 | if (inflateInit2(&rx_strm, -15) != Z_OK) { | |
284 | rprintf(FERROR, "inflate init failed\n"); | |
65417579 | 285 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
286 | } |
287 | if ((cbuf = malloc(MAX_DATA_COUNT)) == NULL | |
288 | || (dbuf = malloc(CHUNK_SIZE)) == NULL) | |
289 | out_of_memory("recv_deflated_token"); | |
290 | init_done = 1; | |
291 | } else { | |
292 | inflateReset(&rx_strm); | |
293 | } | |
b8d4524b | 294 | recv_state = r_idle; |
5914bf15 PM |
295 | rx_token = 0; |
296 | break; | |
297 | ||
298 | case r_idle: | |
299 | case r_inflated: | |
300 | if (saved_flag) { | |
301 | flag = saved_flag & 0xff; | |
302 | saved_flag = 0; | |
303 | } else | |
304 | flag = read_byte(f); | |
305 | if ((flag & 0xC0) == DEFLATED_DATA) { | |
306 | n = ((flag & 0x3f) << 8) + read_byte(f); | |
307 | read_buf(f, cbuf, n); | |
308 | rx_strm.next_in = (Bytef *)cbuf; | |
309 | rx_strm.avail_in = n; | |
310 | recv_state = r_inflating; | |
311 | break; | |
312 | } | |
313 | if (recv_state == r_inflated) { | |
314 | /* check previous inflated stuff ended correctly */ | |
315 | rx_strm.avail_in = 0; | |
316 | rx_strm.next_out = (Bytef *)dbuf; | |
317 | rx_strm.avail_out = CHUNK_SIZE; | |
318 | r = inflate(&rx_strm, Z_SYNC_FLUSH); | |
319 | n = CHUNK_SIZE - rx_strm.avail_out; | |
320 | /* | |
321 | * Z_BUF_ERROR just means no progress was | |
322 | * made, i.e. the decompressor didn't have | |
323 | * any pending output for us. | |
324 | */ | |
325 | if (r != Z_OK && r != Z_BUF_ERROR) { | |
326 | rprintf(FERROR, "inflate flush returned %d (%d bytes)\n", | |
327 | r, n); | |
65417579 | 328 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
329 | } |
330 | if (n != 0 && r != Z_BUF_ERROR) { | |
331 | /* have to return some more data and | |
332 | save the flag for later. */ | |
333 | saved_flag = flag + 0x10000; | |
334 | *data = dbuf; | |
335 | return n; | |
336 | } | |
337 | /* | |
338 | * At this point the decompressor should | |
339 | * be expecting to see the 0, 0, ff, ff bytes. | |
340 | */ | |
341 | if (!inflateSyncPoint(&rx_strm)) { | |
342 | rprintf(FERROR, "decompressor lost sync!\n"); | |
65417579 | 343 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
344 | } |
345 | rx_strm.avail_in = 4; | |
346 | rx_strm.next_in = (Bytef *)cbuf; | |
347 | cbuf[0] = cbuf[1] = 0; | |
348 | cbuf[2] = cbuf[3] = 0xff; | |
349 | inflate(&rx_strm, Z_SYNC_FLUSH); | |
350 | recv_state = r_idle; | |
351 | } | |
352 | if (flag == END_FLAG) { | |
353 | /* that's all folks */ | |
354 | recv_state = r_init; | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* here we have a token of some kind */ | |
359 | if (flag & TOKEN_REL) { | |
360 | rx_token += flag & 0x3f; | |
361 | flag >>= 6; | |
362 | } else | |
363 | rx_token = read_int(f); | |
364 | if (flag & 1) { | |
365 | rx_run = read_byte(f); | |
366 | rx_run += read_byte(f) << 8; | |
367 | recv_state = r_running; | |
368 | } | |
369 | return -1 - rx_token; | |
370 | ||
371 | case r_inflating: | |
372 | rx_strm.next_out = (Bytef *)dbuf; | |
373 | rx_strm.avail_out = CHUNK_SIZE; | |
374 | r = inflate(&rx_strm, Z_NO_FLUSH); | |
375 | n = CHUNK_SIZE - rx_strm.avail_out; | |
376 | if (r != Z_OK) { | |
377 | rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n); | |
65417579 | 378 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
379 | } |
380 | if (rx_strm.avail_in == 0) | |
381 | recv_state = r_inflated; | |
382 | if (n != 0) { | |
383 | *data = dbuf; | |
384 | return n; | |
385 | } | |
386 | break; | |
387 | ||
388 | case r_running: | |
389 | ++rx_token; | |
390 | if (--rx_run == 0) | |
391 | recv_state = r_idle; | |
392 | return -1 - rx_token; | |
b8d4524b | 393 | } |
861c20b4 | 394 | } |
861c20b4 PM |
395 | } |
396 | ||
397 | /* | |
398 | * put the data corresponding to a token that we've just returned | |
399 | * from recv_deflated_token into the decompressor's history buffer. | |
400 | */ | |
6e4fb64e | 401 | static void see_deflate_token(char *buf, int len) |
861c20b4 | 402 | { |
5914bf15 PM |
403 | int r, blklen; |
404 | unsigned char hdr[5]; | |
405 | ||
406 | rx_strm.avail_in = 0; | |
407 | blklen = 0; | |
408 | hdr[0] = 0; | |
409 | do { | |
410 | if (rx_strm.avail_in == 0 && len != 0) { | |
411 | if (blklen == 0) { | |
412 | /* Give it a fake stored-block header. */ | |
413 | rx_strm.next_in = (Bytef *)hdr; | |
414 | rx_strm.avail_in = 5; | |
415 | blklen = len; | |
416 | if (blklen > 0xffff) | |
417 | blklen = 0xffff; | |
418 | hdr[1] = blklen; | |
419 | hdr[2] = blklen >> 8; | |
420 | hdr[3] = ~hdr[1]; | |
421 | hdr[4] = ~hdr[2]; | |
422 | } else { | |
423 | rx_strm.next_in = (Bytef *)buf; | |
424 | rx_strm.avail_in = blklen; | |
425 | len -= blklen; | |
426 | blklen = 0; | |
427 | } | |
428 | } | |
429 | rx_strm.next_out = (Bytef *)dbuf; | |
430 | rx_strm.avail_out = CHUNK_SIZE; | |
431 | r = inflate(&rx_strm, Z_SYNC_FLUSH); | |
432 | if (r != Z_OK) { | |
433 | rprintf(FERROR, "inflate (token) returned %d\n", r); | |
65417579 | 434 | exit_cleanup(RERR_STREAMIO); |
5914bf15 PM |
435 | } |
436 | } while (len || rx_strm.avail_out == 0); | |
861c20b4 | 437 | } |
70d794dc AT |
438 | |
439 | /* | |
440 | * transmit a verbatim buffer of length n followed by a token | |
441 | * If token == -1 then we have reached EOF | |
442 | * If n == 0 then don't send a buffer | |
70d794dc | 443 | */ |
45f133b9 | 444 | void send_token(int f,int token,struct map_struct *buf,OFF_T offset, |
9e31c482 | 445 | int n,int toklen) |
70d794dc | 446 | { |
5914bf15 PM |
447 | if (!do_compression) { |
448 | simple_send_token(f,token,buf,offset,n); | |
449 | } else { | |
450 | send_deflated_token(f, token, buf, offset, n, toklen); | |
451 | } | |
70d794dc AT |
452 | } |
453 | ||
454 | ||
455 | /* | |
456 | * receive a token or buffer from the other end. If the reurn value is >0 then | |
457 | * it is a data buffer of that length, and *data will point at the data. | |
458 | * if the return value is -i then it represents token i-1 | |
459 | * if the return value is 0 then the end has been reached | |
460 | */ | |
461 | int recv_token(int f,char **data) | |
462 | { | |
5914bf15 PM |
463 | int tok; |
464 | ||
465 | if (!do_compression) { | |
466 | tok = simple_recv_token(f,data); | |
467 | } else { | |
468 | tok = recv_deflated_token(f, data); | |
469 | } | |
470 | return tok; | |
861c20b4 PM |
471 | } |
472 | ||
473 | /* | |
474 | * look at the data corresponding to a token, if necessary | |
475 | */ | |
476 | void see_token(char *data, int toklen) | |
477 | { | |
5914bf15 PM |
478 | if (do_compression) |
479 | see_deflate_token(data, toklen); | |
70d794dc | 480 | } |