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;
24 static int compression_level = Z_DEFAULT_COMPRESSION;
26 /* determine the compression level based on a wildcard filename list */
27 void set_compression(char *fname)
33 if (!do_compression) return;
35 compression_level = Z_DEFAULT_COMPRESSION;
36 dont = lp_dont_compress(module_id);
38 if (!dont || !*dont) return;
40 if ((dont[0] == '*') && (!dont[1])) {
41 /* an optimization to skip the rest of this routine */
42 compression_level = 0;
47 fname = strdup(fname);
48 if (!dont || !fname) return;
53 for (tok=strtok(dont," ");tok;tok=strtok(NULL," ")) {
54 if (wildmatch(tok, fname)) {
55 compression_level = 0;
63 /* non-compressing recv token */
64 static int simple_recv_token(int f,char **data)
71 buf = new_array(char, CHUNK_SIZE);
72 if (!buf) out_of_memory("simple_recv_token");
82 n = MIN(CHUNK_SIZE,residue);
89 /* non-compressing send token */
90 static void simple_send_token(int f,int token,
91 struct map_struct *buf,OFF_T offset,int n)
93 extern int write_batch;
99 int n1 = MIN(CHUNK_SIZE,n-l);
101 write_buf(f,map_ptr(buf,offset+l,n1),n1);
103 write_batch_delta_file( (char *) &n1, sizeof(int) );
104 write_batch_delta_file(map_ptr(buf,offset+l,n1),n1);
109 /* a -2 token means to send data only and no token */
111 write_int(f,-(token+1));
113 hold_int = -(token+1);
114 write_batch_delta_file( (char *) &hold_int, sizeof(int) );
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 */
128 #define MAX_DATA_COUNT 16383 /* fit 14 bit count into 2 bytes with flags */
130 /* zlib.h says that if we want to be able to compress something in a single
131 * call, avail_out must be at least 0.1% larger than avail_in plus 12 bytes.
132 * We'll add in 0.1%+16, just to be safe (and we'll avoid floating point,
133 * to ensure that this is a compile-time value). */
134 #define AVAIL_OUT_SIZE(avail_in_size) ((avail_in_size)*1001/1000+16)
136 /* For coding runs of tokens */
137 static int last_token = -1;
138 static int run_start;
139 static int last_run_end;
141 /* Deflation state */
142 static z_stream tx_strm;
147 /* We want obuf to be able to hold both MAX_DATA_COUNT+2 bytes as well as
148 * AVAIL_OUT_SIZE(CHUNK_SIZE) bytes, so make sure that it's large enough. */
149 #if MAX_DATA_COUNT+2 > AVAIL_OUT_SIZE(CHUNK_SIZE)
150 #define OBUF_SIZE (MAX_DATA_COUNT+2)
152 #define OBUF_SIZE AVAIL_OUT_SIZE(CHUNK_SIZE)
155 /* Send a deflated token */
157 send_deflated_token(int f, int token,
158 struct map_struct *buf, OFF_T offset, int nb, int toklen)
161 static int init_done, flush_pending;
162 extern int write_batch;
165 if (last_token == -1) {
168 tx_strm.next_in = NULL;
169 tx_strm.zalloc = NULL;
170 tx_strm.zfree = NULL;
171 if (deflateInit2(&tx_strm, compression_level,
173 Z_DEFAULT_STRATEGY) != Z_OK) {
174 rprintf(FERROR, "compression init failed\n");
175 exit_cleanup(RERR_STREAMIO);
177 if ((obuf = new_array(char, OBUF_SIZE)) == NULL)
178 out_of_memory("send_deflated_token");
181 deflateReset(&tx_strm);
186 } else if (last_token == -2) {
189 } else if (nb != 0 || token != last_token + 1
190 || token >= run_start + 65536) {
191 /* output previous run */
192 r = run_start - last_run_end;
193 n = last_token - run_start;
194 if (r >= 0 && r <= 63) {
195 write_byte(f, (n==0? TOKEN_REL: TOKENRUN_REL) + r);
197 temp_byte = (char)( (n==0? TOKEN_REL: TOKENRUN_REL) + r);
198 write_batch_delta_file(&temp_byte,sizeof(char));
201 write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
202 write_int(f, run_start);
204 temp_byte = (char)(n==0? TOKEN_LONG: TOKENRUN_LONG);
205 write_batch_delta_file(&temp_byte,sizeof(char));
206 write_batch_delta_file((char *)&run_start,sizeof(run_start));
211 write_byte(f, n >> 8);
214 write_batch_delta_file(&temp_byte,sizeof(char));
215 temp_byte = (char)(n >> 8);
216 write_batch_delta_file(&temp_byte,sizeof(char));
219 last_run_end = last_token;
225 if (nb != 0 || flush_pending) {
226 /* deflate the data starting at offset */
227 int flush = Z_NO_FLUSH;
228 tx_strm.avail_in = 0;
229 tx_strm.avail_out = 0;
231 if (tx_strm.avail_in == 0 && nb != 0) {
232 /* give it some more input */
233 n = MIN(nb, CHUNK_SIZE);
234 tx_strm.next_in = (Bytef *)
235 map_ptr(buf, offset, n);
236 tx_strm.avail_in = n;
240 if (tx_strm.avail_out == 0) {
241 tx_strm.next_out = (Bytef *)(obuf + 2);
242 tx_strm.avail_out = MAX_DATA_COUNT;
243 if (flush != Z_NO_FLUSH) {
245 * We left the last 4 bytes in the
246 * buffer, in case they are the
247 * last 4. Move them to the front.
249 memcpy(tx_strm.next_out,
250 obuf+MAX_DATA_COUNT-2, 4);
251 tx_strm.next_out += 4;
252 tx_strm.avail_out -= 4;
255 if (nb == 0 && token != -2)
256 flush = Z_SYNC_FLUSH;
257 r = deflate(&tx_strm, flush);
259 rprintf(FERROR, "deflate returned %d\n", r);
260 exit_cleanup(RERR_STREAMIO);
262 if (nb == 0 || tx_strm.avail_out == 0) {
263 n = MAX_DATA_COUNT - tx_strm.avail_out;
264 if (flush != Z_NO_FLUSH) {
266 * We have to trim off the last 4
267 * bytes of output when flushing
268 * (they are just 0, 0, ff, ff).
273 obuf[0] = DEFLATED_DATA + (n >> 8);
275 write_buf(f, obuf, n+2);
277 write_batch_delta_file(obuf,n+2);
280 } while (nb != 0 || tx_strm.avail_out == 0);
281 flush_pending = token == -2;
285 /* end of file - clean up */
286 write_byte(f, END_FLAG);
288 temp_byte = END_FLAG;
289 write_batch_delta_file(&temp_byte,sizeof(char));
292 } else if (token != -2) {
293 /* add the data in the current block to the compressor's
294 history and hash table */
295 tx_strm.next_in = (Bytef *) map_ptr(buf, offset, toklen);
296 tx_strm.avail_in = toklen;
297 tx_strm.next_out = (Bytef *) obuf;
298 tx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
299 r = deflate(&tx_strm, Z_INSERT_ONLY);
300 if (r != Z_OK || tx_strm.avail_in != 0) {
301 rprintf(FERROR, "deflate on token returned %d (%d bytes left)\n",
302 r, tx_strm.avail_in);
303 exit_cleanup(RERR_STREAMIO);
309 /* tells us what the receiver is in the middle of doing */
310 static enum { r_init, r_idle, r_running, r_inflating, r_inflated } recv_state;
312 /* for inflating stuff */
313 static z_stream rx_strm;
317 /* for decoding runs of tokens */
321 /* Receive a deflated token and inflate it */
323 recv_deflated_token(int f, char **data)
326 static int init_done;
327 static int saved_flag;
330 switch (recv_state) {
333 rx_strm.next_out = NULL;
334 rx_strm.zalloc = NULL;
335 rx_strm.zfree = NULL;
336 if (inflateInit2(&rx_strm, -15) != Z_OK) {
337 rprintf(FERROR, "inflate init failed\n");
338 exit_cleanup(RERR_STREAMIO);
340 if (!(cbuf = new_array(char, MAX_DATA_COUNT))
341 || !(dbuf = new_array(char, AVAIL_OUT_SIZE(CHUNK_SIZE))))
342 out_of_memory("recv_deflated_token");
345 inflateReset(&rx_strm);
354 flag = saved_flag & 0xff;
358 if ((flag & 0xC0) == DEFLATED_DATA) {
359 n = ((flag & 0x3f) << 8) + read_byte(f);
360 read_buf(f, cbuf, n);
361 rx_strm.next_in = (Bytef *)cbuf;
362 rx_strm.avail_in = n;
363 recv_state = r_inflating;
366 if (recv_state == r_inflated) {
367 /* check previous inflated stuff ended correctly */
368 rx_strm.avail_in = 0;
369 rx_strm.next_out = (Bytef *)dbuf;
370 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
371 r = inflate(&rx_strm, Z_SYNC_FLUSH);
372 n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out;
374 * Z_BUF_ERROR just means no progress was
375 * made, i.e. the decompressor didn't have
376 * any pending output for us.
378 if (r != Z_OK && r != Z_BUF_ERROR) {
379 rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
381 exit_cleanup(RERR_STREAMIO);
383 if (n != 0 && r != Z_BUF_ERROR) {
384 /* have to return some more data and
385 save the flag for later. */
386 saved_flag = flag + 0x10000;
391 * At this point the decompressor should
392 * be expecting to see the 0, 0, ff, ff bytes.
394 if (!inflateSyncPoint(&rx_strm)) {
395 rprintf(FERROR, "decompressor lost sync!\n");
396 exit_cleanup(RERR_STREAMIO);
398 rx_strm.avail_in = 4;
399 rx_strm.next_in = (Bytef *)cbuf;
400 cbuf[0] = cbuf[1] = 0;
401 cbuf[2] = cbuf[3] = 0xff;
402 inflate(&rx_strm, Z_SYNC_FLUSH);
405 if (flag == END_FLAG) {
406 /* that's all folks */
411 /* here we have a token of some kind */
412 if (flag & TOKEN_REL) {
413 rx_token += flag & 0x3f;
416 rx_token = read_int(f);
418 rx_run = read_byte(f);
419 rx_run += read_byte(f) << 8;
420 recv_state = r_running;
422 return -1 - rx_token;
425 rx_strm.next_out = (Bytef *)dbuf;
426 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
427 r = inflate(&rx_strm, Z_NO_FLUSH);
428 n = AVAIL_OUT_SIZE(CHUNK_SIZE) - rx_strm.avail_out;
430 rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
431 exit_cleanup(RERR_STREAMIO);
433 if (rx_strm.avail_in == 0)
434 recv_state = r_inflated;
445 return -1 - rx_token;
451 * put the data corresponding to a token that we've just returned
452 * from recv_deflated_token into the decompressor's history buffer.
454 static void see_deflate_token(char *buf, int len)
457 unsigned char hdr[5];
459 rx_strm.avail_in = 0;
463 if (rx_strm.avail_in == 0 && len != 0) {
465 /* Give it a fake stored-block header. */
466 rx_strm.next_in = (Bytef *)hdr;
467 rx_strm.avail_in = 5;
472 hdr[2] = blklen >> 8;
476 rx_strm.next_in = (Bytef *)buf;
477 rx_strm.avail_in = blklen;
482 rx_strm.next_out = (Bytef *)dbuf;
483 rx_strm.avail_out = AVAIL_OUT_SIZE(CHUNK_SIZE);
484 r = inflate(&rx_strm, Z_SYNC_FLUSH);
486 rprintf(FERROR, "inflate (token) returned %d\n", r);
487 exit_cleanup(RERR_STREAMIO);
489 } while (len || rx_strm.avail_out == 0);
493 * Transmit a verbatim buffer of length @p n followed by a token.
494 * If token == -1 then we have reached EOF
495 * If n == 0 then don't send a buffer
497 void send_token(int f,int token,struct map_struct *buf,OFF_T offset,
500 if (!do_compression) {
501 simple_send_token(f,token,buf,offset,n);
503 send_deflated_token(f, token, buf, offset, n, toklen);
509 * receive a token or buffer from the other end. If the reurn value is >0 then
510 * it is a data buffer of that length, and *data will point at the data.
511 * if the return value is -i then it represents token i-1
512 * if the return value is 0 then the end has been reached
514 int recv_token(int f,char **data)
518 if (!do_compression) {
519 tok = simple_recv_token(f,data);
521 tok = recv_deflated_token(f, data);
527 * look at the data corresponding to a token, if necessary
529 void see_token(char *data, int toklen)
532 see_deflate_token(data, toklen);