2 Copyright (C) Andrew Tridgell 1996
3 Copyright (C) Paul Mackerras 1996
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.
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.
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.
21 #include "zlib/zlib.h"
23 extern int do_compression;
25 extern int write_batch;
27 static int compression_level = Z_DEFAULT_COMPRESSION;
29 /* determine the compression level based on a wildcard filename list */
30 void set_compression(char *fname)
38 compression_level = Z_DEFAULT_COMPRESSION;
39 dont = lp_dont_compress(module_id);
44 if (dont[0] == '*' && !dont[1]) {
45 /* an optimization to skip the rest of this routine */
46 compression_level = 0;
51 fname = strdup(fname);
58 for (tok = strtok(dont, " "); tok; tok = strtok(NULL, " ")) {
59 if (wildmatch(tok, fname)) {
60 compression_level = 0;
68 /* non-compressing recv token */
69 static int simple_recv_token(int f,char **data)
76 buf = new_array(char, CHUNK_SIZE);
78 out_of_memory("simple_recv_token");
89 n = MIN(CHUNK_SIZE,residue);
96 /* non-compressing send token */
97 static void simple_send_token(int f,int token,
98 struct map_struct *buf,OFF_T offset,int n)
105 int n1 = MIN(CHUNK_SIZE,n-l);
107 write_buf(f,map_ptr(buf,offset+l,n1),n1);
109 write_batch_delta_file( (char *) &n1, sizeof(int) );
110 write_batch_delta_file(map_ptr(buf,offset+l,n1),n1);
115 /* a -2 token means to send data only and no token */
117 write_int(f,-(token+1));
119 hold_int = -(token+1);
120 write_batch_delta_file( (char *) &hold_int, sizeof(int) );
126 /* Flag bytes in compressed stream are encoded as follows: */
127 #define END_FLAG 0 /* that's all folks */
128 #define TOKEN_LONG 0x20 /* followed by 32-bit token number */
129 #define TOKENRUN_LONG 0x21 /* ditto with 16-bit run count */
130 #define DEFLATED_DATA 0x40 /* + 6-bit high len, then low len byte */
131 #define TOKEN_REL 0x80 /* + 6-bit relative token number */
132 #define TOKENRUN_REL 0xc0 /* ditto with 16-bit run count */
134 #define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */
136 /* zlib.h says that if we want to be able to compress something in a single
137 * call, avail_out must be at least 0.1% larger than avail_in plus 12 bytes.
138 * We'll add in 0.1%+16, just to be safe (and we'll avoid floating point,
139 * to ensure that this is a compile-time value). */
140 #define AVAIL_OUT_SIZE(avail_in_size) ((avail_in_size)*1001/1000+16)
142 /* For coding runs of tokens */
143 static int last_token = -1;
144 static int run_start;
145 static int last_run_end;
147 /* Deflation state */
148 static z_stream tx_strm;
153 /* We want obuf to be able to hold both MAX_DATA_COUNT+2 bytes as well as
154 * AVAIL_OUT_SIZE(CHUNK_SIZE) bytes, so make sure that it's large enough. */
155 #if MAX_DATA_COUNT+2 > AVAIL_OUT_SIZE(CHUNK_SIZE)
156 #define OBUF_SIZE (MAX_DATA_COUNT+2)
158 #define OBUF_SIZE AVAIL_OUT_SIZE(CHUNK_SIZE)
161 /* Send a deflated token */
163 send_deflated_token(int f, int token,
164 struct map_struct *buf, OFF_T offset, int nb, int toklen)
167 static int init_done, flush_pending;
170 if (last_token == -1) {
173 tx_strm.next_in = NULL;
174 tx_strm.zalloc = NULL;
175 tx_strm.zfree = NULL;
176 if (deflateInit2(&tx_strm, compression_level,
178 Z_DEFAULT_STRATEGY) != Z_OK) {
179 rprintf(FERROR, "compression init failed\n");
180 exit_cleanup(RERR_STREAMIO);
182 if ((obuf = new_array(char, OBUF_SIZE)) == NULL)
183 out_of_memory("send_deflated_token");
186 deflateReset(&tx_strm);
191 } else if (last_token == -2) {
194 } else if (nb != 0 || token != last_token + 1
195 || token >= run_start + 65536) {
196 /* output previous run */
197 r = run_start - last_run_end;
198 n = last_token - run_start;
199 if (r >= 0 && r <= 63) {
200 write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
202 temp_byte = (char)( (n==0? TOKEN_REL: TOKENRUN_REL) + r);
203 write_batch_delta_file(&temp_byte,sizeof(char));
206 write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
207 write_int(f, run_start);
209 temp_byte = (char)(n==0? TOKEN_LONG: TOKENRUN_LONG);
210 write_batch_delta_file(&temp_byte,sizeof(char));
211 write_batch_delta_file((char *)&run_start,sizeof(run_start));
216 write_byte(f, n >> 8);
219 write_batch_delta_file(&temp_byte,sizeof(char));
220 temp_byte = (char)(n >> 8);
221 write_batch_delta_file(&temp_byte,sizeof(char));
224 last_run_end = last_token;
230 if (nb != 0 || flush_pending) {
231 /* deflate the data starting at offset */
232 int flush = Z_NO_FLUSH;
233 tx_strm.avail_in = 0;
234 tx_strm.avail_out = 0;
236 if (tx_strm.avail_in == 0 && nb != 0) {
237 /* give it some more input */
238 n = MIN(nb, CHUNK_SIZE);
239 tx_strm.next_in = (Bytef *)
240 map_ptr(buf, offset, n);
241 tx_strm.avail_in = n;
245 if (tx_strm.avail_out == 0) {
246 tx_strm.next_out = (Bytef *)(obuf + 2);
247 tx_strm.avail_out = MAX_DATA_COUNT;
248 if (flush != Z_NO_FLUSH) {
250 * We left the last 4 bytes in the
251 * buffer, in case they are the
252 * last 4. Move them to the front.
254 memcpy(tx_strm.next_out,
255 obuf+MAX_DATA_COUNT-2, 4);
256 tx_strm.next_out += 4;
257 tx_strm.avail_out -= 4;
260 if (nb == 0 && token != -2)
261 flush = Z_SYNC_FLUSH;
262 r = deflate(&tx_strm, flush);
264 rprintf(FERROR, "deflate returned %d\n", r);
265 exit_cleanup(RERR_STREAMIO);
267 if (nb == 0 || tx_strm.avail_out == 0) {
268 n = MAX_DATA_COUNT - tx_strm.avail_out;
269 if (flush != Z_NO_FLUSH) {
271 * We have to trim off the last 4
272 * bytes of output when flushing
273 * (they are just 0, 0, ff, ff).
278 obuf[0] = DEFLATED_DATA + (n >> 8);
280 write_buf(f, obuf, n+2);
282 write_batch_delta_file(obuf,n+2);
285 } while (nb != 0 || tx_strm.avail_out == 0);
286 flush_pending = token == -2;
290 /* end of file - clean up */
291 write_byte(f, END_FLAG);
293 temp_byte = END_FLAG;
294 write_batch_delta_file(&temp_byte,sizeof(char));
297 } else if (token != -2) {
298 /* add the data in the current block to the compressor's
299 history and hash table */
300 tx_strm.next_in = (Bytef *) map_ptr(buf, offset, toklen);
301 tx_strm.avail_in = toklen;
302 tx_strm.next_out = (Bytef *) obuf;
303 tx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
304 r = deflate(&tx_strm, Z_INSERT_ONLY);
305 if (r != Z_OK || tx_strm.avail_in != 0) {
306 rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
307 r, tx_strm.avail_in);
308 exit_cleanup(RERR_STREAMIO);
314 /* tells us what the receiver is in the middle of doing */
315 static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;
317 /* for inflating stuff */
318 static z_stream rx_strm;
322 /* for decoding runs of tokens */
326 /* Receive a deflated token and inflate it */
328 recv_deflated_token(int f, char **data)
331 static int init_done;
332 static int saved_flag;
335 switch (recv_state) {
338 rx_strm.next_out = NULL;
339 rx_strm.zalloc = NULL;
340 rx_strm.zfree = NULL;
341 if (inflateInit2(&rx_strm, -15) != Z_OK) {
342 rprintf(FERROR, "inflate init failed\n");
343 exit_cleanup(RERR_STREAMIO);
345 if (!(cbuf = new_array(char, MAX_DATA_COUNT))
346 || !(dbuf = new_array(char, AVAIL_OUT_SIZE(CHUNK_SIZE))))
347 out_of_memory("recv_deflated_token");
350 inflateReset(&rx_strm);
359 flag = saved_flag & 0xff;
363 if ((flag & 0xC0) == DEFLATED_DATA) {
364 n = ((flag & 0x3f) << 8) + read_byte(f);
365 read_buf(f, cbuf, n);
366 rx_strm.next_in = (Bytef *)cbuf;
367 rx_strm.avail_in = n;
368 recv_state = r_inflating;
371 if (recv_state == r_inflated) {
372 /* check previous inflated stuff ended correctly */
373 rx_strm.avail_in = 0;
374 rx_strm.next_out = (Bytef *)dbuf;
375 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
376 r = inflate(&rx_strm, Z_SYNC_FLUSH);
377 n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out;
379 * Z_BUF_ERROR just means no progress was
380 * made, i.e. the decompressor didn't have
381 * any pending output for us.
383 if (r != Z_OK && r != Z_BUF_ERROR) {
384 rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
386 exit_cleanup(RERR_STREAMIO);
388 if (n != 0 && r != Z_BUF_ERROR) {
389 /* have to return some more data and
390 save the flag for later. */
391 saved_flag = flag + 0x10000;
396 * At this point the decompressor should
397 * be expecting to see the 0, 0, ff, ff bytes.
399 if (!inflateSyncPoint(&rx_strm)) {
400 rprintf(FERROR, "decompressor lost sync!\n");
401 exit_cleanup(RERR_STREAMIO);
403 rx_strm.avail_in = 4;
404 rx_strm.next_in = (Bytef *)cbuf;
405 cbuf[0] = cbuf[1] = 0;
406 cbuf[2] = cbuf[3] = 0xff;
407 inflate(&rx_strm, Z_SYNC_FLUSH);
410 if (flag == END_FLAG) {
411 /* that's all folks */
416 /* here we have a token of some kind */
417 if (flag & TOKEN_REL) {
418 rx_token += flag & 0x3f;
421 rx_token = read_int(f);
423 rx_run = read_byte(f);
424 rx_run += read_byte(f) << 8;
425 recv_state = r_running;
427 return -1 - rx_token;
430 rx_strm.next_out = (Bytef *)dbuf;
431 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
432 r = inflate(&rx_strm, Z_NO_FLUSH);
433 n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out;
435 rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
436 exit_cleanup(RERR_STREAMIO);
438 if (rx_strm.avail_in == 0)
439 recv_state = r_inflated;
450 return -1 - rx_token;
456 * put the data corresponding to a token that we've just returned
457 * from recv_deflated_token into the decompressor's history buffer.
459 static void see_deflate_token(char *buf, int len)
462 unsigned char hdr[5];
464 rx_strm.avail_in = 0;
468 if (rx_strm.avail_in == 0 && len != 0) {
470 /* Give it a fake stored-block header. */
471 rx_strm.next_in = (Bytef *)hdr;
472 rx_strm.avail_in = 5;
477 hdr[2] = blklen >> 8;
481 rx_strm.next_in = (Bytef *)buf;
482 rx_strm.avail_in = blklen;
487 rx_strm.next_out = (Bytef *)dbuf;
488 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
489 r = inflate(&rx_strm, Z_SYNC_FLUSH);
491 rprintf(FERROR, "inflate (token) returned %d\n", r);
492 exit_cleanup(RERR_STREAMIO);
494 } while (len || rx_strm.avail_out == 0);
498 * Transmit a verbatim buffer of length @p n followed by a token.
499 * If token == -1 then we have reached EOF
500 * If n == 0 then don't send a buffer
502 void send_token(int f,int token,struct map_struct *buf,OFF_T offset,
505 if (!do_compression) {
506 simple_send_token(f,token,buf,offset,n);
508 send_deflated_token(f, token, buf, offset, n, toklen);
514 * receive a token or buffer from the other end. If the reurn value is >0 then
515 * it is a data buffer of that length, and *data will point at the data.
516 * if the return value is -i then it represents token i-1
517 * if the return value is 0 then the end has been reached
519 int recv_token(int f,char **data)
523 if (!do_compression) {
524 tok = simple_recv_token(f,data);
526 tok = recv_deflated_token(f, data);
532 * look at the data corresponding to a token, if necessary
534 void see_token(char *data, int toklen)
537 see_deflate_token(data, toklen);