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 (fnmatch(tok, fname, 0) == 0) {
55 compression_level = 0;
63 /* non-compressing recv token */
64 static int simple_recv_token(int f,char **data)
71 buf = (char *)malloc(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; /* dw */
94 int hold_int; /* dw */
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 /* For coding runs of tokens */
131 static int last_token = -1;
132 static int run_start;
133 static int last_run_end;
135 /* Deflation state */
136 static z_stream tx_strm;
140 static int obuf_size;
142 /* Send a deflated token */
144 send_deflated_token(int f, int token,
145 struct map_struct *buf, OFF_T offset, int nb, int toklen)
148 static int init_done, flush_pending;
149 extern int write_batch; /* dw */
150 char temp_byte; /* dw */
152 if (last_token == -1) {
155 tx_strm.next_in = NULL;
156 tx_strm.zalloc = NULL;
157 tx_strm.zfree = NULL;
158 if (deflateInit2(&tx_strm, compression_level,
160 Z_DEFAULT_STRATEGY) != Z_OK) {
161 rprintf(FERROR, "compression init failed\n");
162 exit_cleanup(RERR_STREAMIO);
164 #if MAX_DATA_COUNT+2 > CHUNK_SIZE+128 /* this shouldn't ever happen... */
165 obuf_size = MAX_DATA_COUNT+2;
167 obuf_size = CHUNK_SIZE+128;
169 if ((obuf = malloc(obuf_size)) == NULL)
170 out_of_memory("send_deflated_token");
173 deflateReset(&tx_strm);
178 } else if (last_token == -2) {
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);
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));
193 write_byte(f, (n==0? TOKEN_LONG: TOKENRUN_LONG));
194 write_int(f, run_start);
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));
203 write_byte(f, n >> 8);
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));
210 last_run_end = last_token;
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;
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;
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) {
236 * We left the last 4 bytes in the
237 * buffer, in case they are the
238 * last 4. Move them to the front.
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;
246 if (nb == 0 && token != -2)
247 flush = Z_SYNC_FLUSH;
248 r = deflate(&tx_strm, flush);
250 rprintf(FERROR, "deflate returned %d\n", r);
251 exit_cleanup(RERR_STREAMIO);
253 if (nb == 0 || tx_strm.avail_out == 0) {
254 n = MAX_DATA_COUNT - tx_strm.avail_out;
255 if (flush != Z_NO_FLUSH) {
257 * We have to trim off the last 4
258 * bytes of output when flushing
259 * (they are just 0, 0, ff, ff).
264 obuf[0] = DEFLATED_DATA + (n >> 8);
266 write_buf(f, obuf, n+2);
267 if (write_batch) /* dw */
268 write_batch_delta_file(obuf,n+2);
271 } while (nb != 0 || tx_strm.avail_out == 0);
272 flush_pending = token == -2;
276 /* end of file - clean up */
277 write_byte(f, END_FLAG);
278 if (write_batch) { /* dw */
279 temp_byte = END_FLAG;
280 write_batch_delta_file((char *)&temp_byte,sizeof(temp_byte));
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;
289 tx_strm.avail_out = obuf_size;
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);
294 exit_cleanup(RERR_STREAMIO);
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;
303 /* for inflating stuff */
304 static z_stream rx_strm;
308 /* for decoding runs of tokens */
312 /* Receive a deflated token and inflate it */
314 recv_deflated_token(int f, char **data)
317 static int init_done;
318 static int saved_flag;
321 switch (recv_state) {
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");
329 exit_cleanup(RERR_STREAMIO);
331 if ((cbuf = malloc(MAX_DATA_COUNT)) == NULL
332 || (dbuf = malloc(CHUNK_SIZE)) == NULL)
333 out_of_memory("recv_deflated_token");
336 inflateReset(&rx_strm);
345 flag = saved_flag & 0xff;
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;
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;
365 * Z_BUF_ERROR just means no progress was
366 * made, i.e. the decompressor didn't have
367 * any pending output for us.
369 if (r != Z_OK && r != Z_BUF_ERROR) {
370 rprintf(FERROR, "inflate flush returned %d (%d bytes)\n",
372 exit_cleanup(RERR_STREAMIO);
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;
382 * At this point the decompressor should
383 * be expecting to see the 0, 0, ff, ff bytes.
385 if (!inflateSyncPoint(&rx_strm)) {
386 rprintf(FERROR, "decompressor lost sync!\n");
387 exit_cleanup(RERR_STREAMIO);
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);
396 if (flag == END_FLAG) {
397 /* that's all folks */
402 /* here we have a token of some kind */
403 if (flag & TOKEN_REL) {
404 rx_token += flag & 0x3f;
407 rx_token = read_int(f);
409 rx_run = read_byte(f);
410 rx_run += read_byte(f) << 8;
411 recv_state = r_running;
413 return -1 - rx_token;
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;
421 rprintf(FERROR, "inflate returned %d (%d bytes)\n", r, n);
422 exit_cleanup(RERR_STREAMIO);
424 if (rx_strm.avail_in == 0)
425 recv_state = r_inflated;
436 return -1 - rx_token;
442 * put the data corresponding to a token that we've just returned
443 * from recv_deflated_token into the decompressor's history buffer.
445 static void see_deflate_token(char *buf, int len)
448 unsigned char hdr[5];
450 rx_strm.avail_in = 0;
454 if (rx_strm.avail_in == 0 && len != 0) {
456 /* Give it a fake stored-block header. */
457 rx_strm.next_in = (Bytef *)hdr;
458 rx_strm.avail_in = 5;
463 hdr[2] = blklen >> 8;
467 rx_strm.next_in = (Bytef *)buf;
468 rx_strm.avail_in = blklen;
473 rx_strm.next_out = (Bytef *)dbuf;
474 rx_strm.avail_out = CHUNK_SIZE;
475 r = inflate(&rx_strm, Z_SYNC_FLUSH);
477 rprintf(FERROR, "inflate (token) returned %d\n", r);
478 exit_cleanup(RERR_STREAMIO);
480 } while (len || rx_strm.avail_out == 0);
484 * Transmit a verbatim buffer of length @p n followed by a token.
485 * If token == -1 then we have reached EOF
486 * If n == 0 then don't send a buffer
488 void send_token(int f,int token,struct map_struct *buf,OFF_T offset,
491 if (!do_compression) {
492 simple_send_token(f,token,buf,offset,n);
494 send_deflated_token(f, token, buf, offset, n, toklen);
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
505 int recv_token(int f,char **data)
509 if (!do_compression) {
510 tok = simple_recv_token(f,data);
512 tok = recv_deflated_token(f, data);
518 * look at the data corresponding to a token, if necessary
520 void see_token(char *data, int toklen)
523 see_deflate_token(data, toklen);