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