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1 /* $Id$ */
2
3 /*
4 * Copyright (c) 1990-1997 Sam Leffler
5 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and
8 * its documentation for any purpose is hereby granted without fee, provided
9 * that (i) the above copyright notices and this permission notice appear in
10 * all copies of the software and related documentation, and (ii) the names of
11 * Sam Leffler and Silicon Graphics may not be used in any advertising or
12 * publicity relating to the software without the specific, prior written
13 * permission of Sam Leffler and Silicon Graphics.
14 *
15 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
17 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
20 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
21 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
22 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 */
26
27 #include "tiffiop.h"
28 #ifdef CCITT_SUPPORT
29 /*
30 * TIFF Library.
31 *
32 * CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support.
33 *
34 * This file contains support for decoding and encoding TIFF
35 * compression algorithms 2, 3, 4, and 32771.
36 *
37 * Decoder support is derived, with permission, from the code
38 * in Frank Cringle's viewfax program;
39 * Copyright (C) 1990, 1995 Frank D. Cringle.
40 */
41 #include "tif_fax3.h"
42 #define G3CODES
43 #include "t4.h"
44 #include <stdio.h>
45
46 /*
47 * Compression+decompression state blocks are
48 * derived from this ``base state'' block.
49 */
50 typedef struct {
51 int rw_mode; /* O_RDONLY for decode, else encode */
52 int mode; /* operating mode */
53 uint32 rowbytes; /* bytes in a decoded scanline */
54 uint32 rowpixels; /* pixels in a scanline */
55
56 uint16 cleanfaxdata; /* CleanFaxData tag */
57 uint32 badfaxrun; /* BadFaxRun tag */
58 uint32 badfaxlines; /* BadFaxLines tag */
59 uint32 groupoptions; /* Group 3/4 options tag */
60 uint32 recvparams; /* encoded Class 2 session params */
61 char* subaddress; /* subaddress string */
62 uint32 recvtime; /* time spent receiving (secs) */
63 char* faxdcs; /* Table 2/T.30 encoded session params */
64 TIFFVGetMethod vgetparent; /* super-class method */
65 TIFFVSetMethod vsetparent; /* super-class method */
66 } Fax3BaseState;
67 #define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data)
68
69 typedef enum { G3_1D, G3_2D } Ttag;
70 typedef struct {
71 Fax3BaseState b;
72
73 /* Decoder state info */
74 const unsigned char* bitmap; /* bit reversal table */
75 uint32 data; /* current i/o byte/word */
76 int bit; /* current i/o bit in byte */
77 int EOLcnt; /* count of EOL codes recognized */
78 TIFFFaxFillFunc fill; /* fill routine */
79 uint32* runs; /* b&w runs for current/previous row */
80 uint32* refruns; /* runs for reference line */
81 uint32* curruns; /* runs for current line */
82
83 /* Encoder state info */
84 Ttag tag; /* encoding state */
85 unsigned char* refline; /* reference line for 2d decoding */
86 int k; /* #rows left that can be 2d encoded */
87 int maxk; /* max #rows that can be 2d encoded */
88 } Fax3CodecState;
89 #define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif))
90 #define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif))
91
92 #define is2DEncoding(sp) \
93 (sp->b.groupoptions & GROUP3OPT_2DENCODING)
94 #define isAligned(p,t) ((((unsigned long)(p)) & (sizeof (t)-1)) == 0)
95
96 /*
97 * Group 3 and Group 4 Decoding.
98 */
99
100 /*
101 * These macros glue the TIFF library state to
102 * the state expected by Frank's decoder.
103 */
104 #define DECLARE_STATE(tif, sp, mod) \
105 static const char module[] = mod; \
106 Fax3CodecState* sp = DecoderState(tif); \
107 int a0; /* reference element */ \
108 int lastx = sp->b.rowpixels; /* last element in row */ \
109 uint32 BitAcc; /* bit accumulator */ \
110 int BitsAvail; /* # valid bits in BitAcc */ \
111 int RunLength; /* length of current run */ \
112 unsigned char* cp; /* next byte of input data */ \
113 unsigned char* ep; /* end of input data */ \
114 uint32* pa; /* place to stuff next run */ \
115 uint32* thisrun; /* current row's run array */ \
116 int EOLcnt; /* # EOL codes recognized */ \
117 const unsigned char* bitmap = sp->bitmap; /* input data bit reverser */ \
118 const TIFFFaxTabEnt* TabEnt
119 #define DECLARE_STATE_2D(tif, sp, mod) \
120 DECLARE_STATE(tif, sp, mod); \
121 int b1; /* next change on prev line */ \
122 uint32* pb /* next run in reference line */\
123 /*
124 * Load any state that may be changed during decoding.
125 */
126 #define CACHE_STATE(tif, sp) do { \
127 BitAcc = sp->data; \
128 BitsAvail = sp->bit; \
129 EOLcnt = sp->EOLcnt; \
130 cp = (unsigned char*) tif->tif_rawcp; \
131 ep = cp + tif->tif_rawcc; \
132 } while (0)
133 /*
134 * Save state possibly changed during decoding.
135 */
136 #define UNCACHE_STATE(tif, sp) do { \
137 sp->bit = BitsAvail; \
138 sp->data = BitAcc; \
139 sp->EOLcnt = EOLcnt; \
140 tif->tif_rawcc -= (tidata_t) cp - tif->tif_rawcp; \
141 tif->tif_rawcp = (tidata_t) cp; \
142 } while (0)
143
144 /*
145 * Setup state for decoding a strip.
146 */
147 static int
148 Fax3PreDecode(TIFF* tif, tsample_t s)
149 {
150 Fax3CodecState* sp = DecoderState(tif);
151
152 (void) s;
153 assert(sp != NULL);
154 sp->bit = 0; /* force initial read */
155 sp->data = 0;
156 sp->EOLcnt = 0; /* force initial scan for EOL */
157 /*
158 * Decoder assumes lsb-to-msb bit order. Note that we select
159 * this here rather than in Fax3SetupState so that viewers can
160 * hold the image open, fiddle with the FillOrder tag value,
161 * and then re-decode the image. Otherwise they'd need to close
162 * and open the image to get the state reset.
163 */
164 sp->bitmap =
165 TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB);
166 if (sp->refruns) { /* init reference line to white */
167 sp->refruns[0] = (uint32) sp->b.rowpixels;
168 sp->refruns[1] = 0;
169 }
170 return (1);
171 }
172
173 /*
174 * Routine for handling various errors/conditions.
175 * Note how they are "glued into the decoder" by
176 * overriding the definitions used by the decoder.
177 */
178
179 static void
180 Fax3Unexpected(const char* module, TIFF* tif, uint32 line, uint32 a0)
181 {
182 TIFFErrorExt(tif->tif_clientdata, module, "%s: Bad code word at line %lu of %s %lu (x %lu)",
183 tif->tif_name, (unsigned long) line, isTiled(tif) ? "tile" : "strip",
184 (unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
185 (unsigned long) a0);
186 }
187 #define unexpected(table, a0) Fax3Unexpected(module, tif, line, a0)
188
189 static void
190 Fax3Extension(const char* module, TIFF* tif, uint32 line, uint32 a0)
191 {
192 TIFFErrorExt(tif->tif_clientdata, module,
193 "%s: Uncompressed data (not supported) at line %lu of %s %lu (x %lu)",
194 tif->tif_name, (unsigned long) line, isTiled(tif) ? "tile" : "strip",
195 (unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
196 (unsigned long) a0);
197 }
198 #define extension(a0) Fax3Extension(module, tif, line, a0)
199
200 static void
201 Fax3BadLength(const char* module, TIFF* tif, uint32 line, uint32 a0, uint32 lastx)
202 {
203 TIFFWarningExt(tif->tif_clientdata, module, "%s: %s at line %lu of %s %lu (got %lu, expected %lu)",
204 tif->tif_name,
205 a0 < lastx ? "Premature EOL" : "Line length mismatch",
206 (unsigned long) line, isTiled(tif) ? "tile" : "strip",
207 (unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
208 (unsigned long) a0, lastx);
209 }
210 #define badlength(a0,lastx) Fax3BadLength(module, tif, line, a0, lastx)
211
212 static void
213 Fax3PrematureEOF(const char* module, TIFF* tif, uint32 line, uint32 a0)
214 {
215 TIFFWarningExt(tif->tif_clientdata, module, "%s: Premature EOF at line %lu of %s %lu (x %lu)",
216 tif->tif_name,
217 (unsigned long) line, isTiled(tif) ? "tile" : "strip",
218 (unsigned long) (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
219 (unsigned long) a0);
220 }
221 #define prematureEOF(a0) Fax3PrematureEOF(module, tif, line, a0)
222
223 #define Nop
224
225 /*
226 * Decode the requested amount of G3 1D-encoded data.
227 */
228 static int
229 Fax3Decode1D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
230 {
231 DECLARE_STATE(tif, sp, "Fax3Decode1D");
232 int line = 0;
233
234 (void) s;
235 CACHE_STATE(tif, sp);
236 thisrun = sp->curruns;
237 while ((long)occ > 0) {
238 a0 = 0;
239 RunLength = 0;
240 pa = thisrun;
241 #ifdef FAX3_DEBUG
242 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
243 printf("-------------------- %d\n", tif->tif_row);
244 fflush(stdout);
245 #endif
246 SYNC_EOL(EOF1D);
247 EXPAND1D(EOF1Da);
248 (*sp->fill)(buf, thisrun, pa, lastx);
249 buf += sp->b.rowbytes;
250 occ -= sp->b.rowbytes;
251 line++;
252 continue;
253 EOF1D: /* premature EOF */
254 CLEANUP_RUNS();
255 EOF1Da: /* premature EOF */
256 (*sp->fill)(buf, thisrun, pa, lastx);
257 UNCACHE_STATE(tif, sp);
258 return (-1);
259 }
260 UNCACHE_STATE(tif, sp);
261 return (1);
262 }
263
264 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
265 /*
266 * Decode the requested amount of G3 2D-encoded data.
267 */
268 static int
269 Fax3Decode2D(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
270 {
271 DECLARE_STATE_2D(tif, sp, "Fax3Decode2D");
272 int line = 0;
273 int is1D; /* current line is 1d/2d-encoded */
274
275 (void) s;
276 CACHE_STATE(tif, sp);
277 while ((long)occ > 0) {
278 a0 = 0;
279 RunLength = 0;
280 pa = thisrun = sp->curruns;
281 #ifdef FAX3_DEBUG
282 printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d",
283 BitAcc, BitsAvail, EOLcnt);
284 #endif
285 SYNC_EOL(EOF2D);
286 NeedBits8(1, EOF2D);
287 is1D = GetBits(1); /* 1D/2D-encoding tag bit */
288 ClrBits(1);
289 #ifdef FAX3_DEBUG
290 printf(" %s\n-------------------- %d\n",
291 is1D ? "1D" : "2D", tif->tif_row);
292 fflush(stdout);
293 #endif
294 pb = sp->refruns;
295 b1 = *pb++;
296 if (is1D)
297 EXPAND1D(EOF2Da);
298 else
299 EXPAND2D(EOF2Da);
300 (*sp->fill)(buf, thisrun, pa, lastx);
301 SETVALUE(0); /* imaginary change for reference */
302 SWAP(uint32*, sp->curruns, sp->refruns);
303 buf += sp->b.rowbytes;
304 occ -= sp->b.rowbytes;
305 line++;
306 continue;
307 EOF2D: /* premature EOF */
308 CLEANUP_RUNS();
309 EOF2Da: /* premature EOF */
310 (*sp->fill)(buf, thisrun, pa, lastx);
311 UNCACHE_STATE(tif, sp);
312 return (-1);
313 }
314 UNCACHE_STATE(tif, sp);
315 return (1);
316 }
317 #undef SWAP
318
319 /*
320 * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes.
321 * For machines with 64-bit longs this is <16 bytes; otherwise
322 * this is <8 bytes. We optimize the code here to reflect the
323 * machine characteristics.
324 */
325 #if SIZEOF_LONG == 8
326 # define FILL(n, cp) \
327 switch (n) { \
328 case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\
329 case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\
330 case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\
331 case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\
332 case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
333 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
334 }
335 # define ZERO(n, cp) \
336 switch (n) { \
337 case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \
338 case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \
339 case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \
340 case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \
341 case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
342 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
343 }
344 #else
345 # define FILL(n, cp) \
346 switch (n) { \
347 case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \
348 case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
349 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
350 }
351 # define ZERO(n, cp) \
352 switch (n) { \
353 case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \
354 case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
355 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
356 }
357 #endif
358
359 /*
360 * Bit-fill a row according to the white/black
361 * runs generated during G3/G4 decoding.
362 */
363 void
364 _TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx)
365 {
366 static const unsigned char _fillmasks[] =
367 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
368 unsigned char* cp;
369 uint32 x, bx, run;
370 int32 n, nw;
371 long* lp;
372
373 if ((erun-runs)&1)
374 *erun++ = 0;
375 x = 0;
376 for (; runs < erun; runs += 2) {
377 run = runs[0];
378 if (x+run > lastx || run > lastx )
379 run = runs[0] = (uint32) (lastx - x);
380 if (run) {
381 cp = buf + (x>>3);
382 bx = x&7;
383 if (run > 8-bx) {
384 if (bx) { /* align to byte boundary */
385 *cp++ &= 0xff << (8-bx);
386 run -= 8-bx;
387 }
388 if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */
389 if ((n/sizeof (long)) > 1) {
390 /*
391 * Align to longword boundary and fill.
392 */
393 for (; n && !isAligned(cp, long); n--)
394 *cp++ = 0x00;
395 lp = (long*) cp;
396 nw = (int32)(n / sizeof (long));
397 n -= nw * sizeof (long);
398 do {
399 *lp++ = 0L;
400 } while (--nw);
401 cp = (unsigned char*) lp;
402 }
403 ZERO(n, cp);
404 run &= 7;
405 }
406 if (run)
407 cp[0] &= 0xff >> run;
408 } else
409 cp[0] &= ~(_fillmasks[run]>>bx);
410 x += runs[0];
411 }
412 run = runs[1];
413 if (x+run > lastx || run > lastx )
414 run = runs[1] = lastx - x;
415 if (run) {
416 cp = buf + (x>>3);
417 bx = x&7;
418 if (run > 8-bx) {
419 if (bx) { /* align to byte boundary */
420 *cp++ |= 0xff >> bx;
421 run -= 8-bx;
422 }
423 if( (n = run>>3) != 0 ) { /* multiple bytes to fill */
424 if ((n/sizeof (long)) > 1) {
425 /*
426 * Align to longword boundary and fill.
427 */
428 for (; n && !isAligned(cp, long); n--)
429 *cp++ = 0xff;
430 lp = (long*) cp;
431 nw = (int32)(n / sizeof (long));
432 n -= nw * sizeof (long);
433 do {
434 *lp++ = -1L;
435 } while (--nw);
436 cp = (unsigned char*) lp;
437 }
438 FILL(n, cp);
439 run &= 7;
440 }
441 if (run)
442 cp[0] |= 0xff00 >> run;
443 } else
444 cp[0] |= _fillmasks[run]>>bx;
445 x += runs[1];
446 }
447 }
448 assert(x == lastx);
449 }
450 #undef ZERO
451 #undef FILL
452
453 /*
454 * Setup G3/G4-related compression/decompression state
455 * before data is processed. This routine is called once
456 * per image -- it sets up different state based on whether
457 * or not decoding or encoding is being done and whether
458 * 1D- or 2D-encoded data is involved.
459 */
460 static int
461 Fax3SetupState(TIFF* tif)
462 {
463 TIFFDirectory* td = &tif->tif_dir;
464 Fax3BaseState* sp = Fax3State(tif);
465 int needsRefLine;
466 Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif);
467 uint32 rowbytes, rowpixels, nruns;
468
469 if (td->td_bitspersample != 1) {
470 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
471 "Bits/sample must be 1 for Group 3/4 encoding/decoding");
472 return (0);
473 }
474 /*
475 * Calculate the scanline/tile widths.
476 */
477 if (isTiled(tif)) {
478 rowbytes = TIFFTileRowSize(tif);
479 rowpixels = td->td_tilewidth;
480 } else {
481 rowbytes = TIFFScanlineSize(tif);
482 rowpixels = td->td_imagewidth;
483 }
484 sp->rowbytes = (uint32) rowbytes;
485 sp->rowpixels = (uint32) rowpixels;
486 /*
487 * Allocate any additional space required for decoding/encoding.
488 */
489 needsRefLine = (
490 (sp->groupoptions & GROUP3OPT_2DENCODING) ||
491 td->td_compression == COMPRESSION_CCITTFAX4
492 );
493
494 nruns = needsRefLine ? 2*TIFFroundup(rowpixels,32) : rowpixels;
495
496 dsp->runs = (uint32*) _TIFFCheckMalloc(tif, 2*nruns+3, sizeof (uint32),
497 "for Group 3/4 run arrays");
498 if (dsp->runs == NULL)
499 return (0);
500 dsp->curruns = dsp->runs;
501 if (needsRefLine)
502 dsp->refruns = dsp->runs + (nruns>>1);
503 else
504 dsp->refruns = NULL;
505 if (td->td_compression == COMPRESSION_CCITTFAX3
506 && is2DEncoding(dsp)) { /* NB: default is 1D routine */
507 tif->tif_decoderow = Fax3Decode2D;
508 tif->tif_decodestrip = Fax3Decode2D;
509 tif->tif_decodetile = Fax3Decode2D;
510 }
511
512 if (needsRefLine) { /* 2d encoding */
513 Fax3CodecState* esp = EncoderState(tif);
514 /*
515 * 2d encoding requires a scanline
516 * buffer for the ``reference line''; the
517 * scanline against which delta encoding
518 * is referenced. The reference line must
519 * be initialized to be ``white'' (done elsewhere).
520 */
521 esp->refline = (unsigned char*) _TIFFmalloc(rowbytes);
522 if (esp->refline == NULL) {
523 TIFFErrorExt(tif->tif_clientdata, "Fax3SetupState",
524 "%s: No space for Group 3/4 reference line",
525 tif->tif_name);
526 return (0);
527 }
528 } else /* 1d encoding */
529 EncoderState(tif)->refline = NULL;
530
531 return (1);
532 }
533
534 /*
535 * CCITT Group 3 FAX Encoding.
536 */
537
538 #define Fax3FlushBits(tif, sp) { \
539 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
540 (void) TIFFFlushData1(tif); \
541 *(tif)->tif_rawcp++ = (tidataval_t) (sp)->data; \
542 (tif)->tif_rawcc++; \
543 (sp)->data = 0, (sp)->bit = 8; \
544 }
545 #define _FlushBits(tif) { \
546 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
547 (void) TIFFFlushData1(tif); \
548 *(tif)->tif_rawcp++ = (tidataval_t) data; \
549 (tif)->tif_rawcc++; \
550 data = 0, bit = 8; \
551 }
552 static const int _msbmask[9] =
553 { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
554 #define _PutBits(tif, bits, length) { \
555 while (length > bit) { \
556 data |= bits >> (length - bit); \
557 length -= bit; \
558 _FlushBits(tif); \
559 } \
560 data |= (bits & _msbmask[length]) << (bit - length); \
561 bit -= length; \
562 if (bit == 0) \
563 _FlushBits(tif); \
564 }
565
566 /*
567 * Write a variable-length bit-value to
568 * the output stream. Values are
569 * assumed to be at most 16 bits.
570 */
571 static void
572 Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length)
573 {
574 Fax3CodecState* sp = EncoderState(tif);
575 unsigned int bit = sp->bit;
576 int data = sp->data;
577
578 _PutBits(tif, bits, length);
579
580 sp->data = data;
581 sp->bit = bit;
582 }
583
584 /*
585 * Write a code to the output stream.
586 */
587 #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
588
589 #ifdef FAX3_DEBUG
590 #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
591 #define DEBUG_PRINT(what,len) { \
592 int t; \
593 printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \
594 for (t = length-1; t >= 0; t--) \
595 putchar(code & (1<<t) ? '1' : '0'); \
596 putchar('\n'); \
597 }
598 #endif
599
600 /*
601 * Write the sequence of codes that describes
602 * the specified span of zero's or one's. The
603 * appropriate table that holds the make-up and
604 * terminating codes is supplied.
605 */
606 static void
607 putspan(TIFF* tif, int32 span, const tableentry* tab)
608 {
609 Fax3CodecState* sp = EncoderState(tif);
610 unsigned int bit = sp->bit;
611 int data = sp->data;
612 unsigned int code, length;
613
614 while (span >= 2624) {
615 const tableentry* te = &tab[63 + (2560>>6)];
616 code = te->code, length = te->length;
617 #ifdef FAX3_DEBUG
618 DEBUG_PRINT("MakeUp", te->runlen);
619 #endif
620 _PutBits(tif, code, length);
621 span -= te->runlen;
622 }
623 if (span >= 64) {
624 const tableentry* te = &tab[63 + (span>>6)];
625 assert(te->runlen == 64*(span>>6));
626 code = te->code, length = te->length;
627 #ifdef FAX3_DEBUG
628 DEBUG_PRINT("MakeUp", te->runlen);
629 #endif
630 _PutBits(tif, code, length);
631 span -= te->runlen;
632 }
633 code = tab[span].code, length = tab[span].length;
634 #ifdef FAX3_DEBUG
635 DEBUG_PRINT(" Term", tab[span].runlen);
636 #endif
637 _PutBits(tif, code, length);
638
639 sp->data = data;
640 sp->bit = bit;
641 }
642
643 /*
644 * Write an EOL code to the output stream. The zero-fill
645 * logic for byte-aligning encoded scanlines is handled
646 * here. We also handle writing the tag bit for the next
647 * scanline when doing 2d encoding.
648 */
649 static void
650 Fax3PutEOL(TIFF* tif)
651 {
652 Fax3CodecState* sp = EncoderState(tif);
653 unsigned int bit = sp->bit;
654 int data = sp->data;
655 unsigned int code, length, tparm;
656
657 if (sp->b.groupoptions & GROUP3OPT_FILLBITS) {
658 /*
659 * Force bit alignment so EOL will terminate on
660 * a byte boundary. That is, force the bit alignment
661 * to 16-12 = 4 before putting out the EOL code.
662 */
663 int align = 8 - 4;
664 if (align != sp->bit) {
665 if (align > sp->bit)
666 align = sp->bit + (8 - align);
667 else
668 align = sp->bit - align;
669 code = 0;
670 tparm=align;
671 _PutBits(tif, 0, tparm);
672 }
673 }
674 code = EOL, length = 12;
675 if (is2DEncoding(sp))
676 code = (code<<1) | (sp->tag == G3_1D), length++;
677 _PutBits(tif, code, length);
678
679 sp->data = data;
680 sp->bit = bit;
681 }
682
683 /*
684 * Reset encoding state at the start of a strip.
685 */
686 static int
687 Fax3PreEncode(TIFF* tif, tsample_t s)
688 {
689 Fax3CodecState* sp = EncoderState(tif);
690
691 (void) s;
692 assert(sp != NULL);
693 sp->bit = 8;
694 sp->data = 0;
695 sp->tag = G3_1D;
696 /*
697 * This is necessary for Group 4; otherwise it isn't
698 * needed because the first scanline of each strip ends
699 * up being copied into the refline.
700 */
701 if (sp->refline)
702 _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
703 if (is2DEncoding(sp)) {
704 float res = tif->tif_dir.td_yresolution;
705 /*
706 * The CCITT spec says that when doing 2d encoding, you
707 * should only do it on K consecutive scanlines, where K
708 * depends on the resolution of the image being encoded
709 * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
710 * code initializes td_yresolution to 0, this code will
711 * select a K of 2 unless the YResolution tag is set
712 * appropriately. (Note also that we fudge a little here
713 * and use 150 lpi to avoid problems with units conversion.)
714 */
715 if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
716 res *= 2.54f; /* convert to inches */
717 sp->maxk = (res > 150 ? 4 : 2);
718 sp->k = sp->maxk-1;
719 } else
720 sp->k = sp->maxk = 0;
721 return (1);
722 }
723
724 static const unsigned char zeroruns[256] = {
725 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
726 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
727 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
728 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
729 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
730 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
731 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
732 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
733 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
734 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
735 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
736 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
737 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
738 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
739 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
740 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
741 };
742 static const unsigned char oneruns[256] = {
743 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
744 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
745 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
746 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
747 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
748 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
749 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
750 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
751 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
752 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
753 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
754 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
755 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
756 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
757 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
758 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
759 };
760
761 /*
762 * On certain systems it pays to inline
763 * the routines that find pixel spans.
764 */
765 #ifdef VAXC
766 static int32 find0span(unsigned char*, int32, int32);
767 static int32 find1span(unsigned char*, int32, int32);
768 #pragma inline(find0span,find1span)
769 #endif
770
771 /*
772 * Find a span of ones or zeros using the supplied
773 * table. The ``base'' of the bit string is supplied
774 * along with the start+end bit indices.
775 */
776 inline static int32
777 find0span(unsigned char* bp, int32 bs, int32 be)
778 {
779 int32 bits = be - bs;
780 int32 n, span;
781
782 bp += bs>>3;
783 /*
784 * Check partial byte on lhs.
785 */
786 if (bits > 0 && (n = (bs & 7))) {
787 span = zeroruns[(*bp << n) & 0xff];
788 if (span > 8-n) /* table value too generous */
789 span = 8-n;
790 if (span > bits) /* constrain span to bit range */
791 span = bits;
792 if (n+span < 8) /* doesn't extend to edge of byte */
793 return (span);
794 bits -= span;
795 bp++;
796 } else
797 span = 0;
798 if (bits >= (int32)(2 * 8 * sizeof(long))) {
799 long* lp;
800 /*
801 * Align to longword boundary and check longwords.
802 */
803 while (!isAligned(bp, long)) {
804 if (*bp != 0x00)
805 return (span + zeroruns[*bp]);
806 span += 8, bits -= 8;
807 bp++;
808 }
809 lp = (long*) bp;
810 while ((bits >= (int32)(8 * sizeof(long))) && (0 == *lp)) {
811 span += 8*sizeof (long), bits -= 8*sizeof (long);
812 lp++;
813 }
814 bp = (unsigned char*) lp;
815 }
816 /*
817 * Scan full bytes for all 0's.
818 */
819 while (bits >= 8) {
820 if (*bp != 0x00) /* end of run */
821 return (span + zeroruns[*bp]);
822 span += 8, bits -= 8;
823 bp++;
824 }
825 /*
826 * Check partial byte on rhs.
827 */
828 if (bits > 0) {
829 n = zeroruns[*bp];
830 span += (n > bits ? bits : n);
831 }
832 return (span);
833 }
834
835 inline static int32
836 find1span(unsigned char* bp, int32 bs, int32 be)
837 {
838 int32 bits = be - bs;
839 int32 n, span;
840
841 bp += bs>>3;
842 /*
843 * Check partial byte on lhs.
844 */
845 if (bits > 0 && (n = (bs & 7))) {
846 span = oneruns[(*bp << n) & 0xff];
847 if (span > 8-n) /* table value too generous */
848 span = 8-n;
849 if (span > bits) /* constrain span to bit range */
850 span = bits;
851 if (n+span < 8) /* doesn't extend to edge of byte */
852 return (span);
853 bits -= span;
854 bp++;
855 } else
856 span = 0;
857 if (bits >= (int32)(2 * 8 * sizeof(long))) {
858 long* lp;
859 /*
860 * Align to longword boundary and check longwords.
861 */
862 while (!isAligned(bp, long)) {
863 if (*bp != 0xff)
864 return (span + oneruns[*bp]);
865 span += 8, bits -= 8;
866 bp++;
867 }
868 lp = (long*) bp;
869 while ((bits >= (int32)(8 * sizeof(long))) && (~0 == *lp)) {
870 span += 8*sizeof (long), bits -= 8*sizeof (long);
871 lp++;
872 }
873 bp = (unsigned char*) lp;
874 }
875 /*
876 * Scan full bytes for all 1's.
877 */
878 while (bits >= 8) {
879 if (*bp != 0xff) /* end of run */
880 return (span + oneruns[*bp]);
881 span += 8, bits -= 8;
882 bp++;
883 }
884 /*
885 * Check partial byte on rhs.
886 */
887 if (bits > 0) {
888 n = oneruns[*bp];
889 span += (n > bits ? bits : n);
890 }
891 return (span);
892 }
893
894 /*
895 * Return the offset of the next bit in the range
896 * [bs..be] that is different from the specified
897 * color. The end, be, is returned if no such bit
898 * exists.
899 */
900 #define finddiff(_cp, _bs, _be, _color) \
901 (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be)))
902 /*
903 * Like finddiff, but also check the starting bit
904 * against the end in case start > end.
905 */
906 #define finddiff2(_cp, _bs, _be, _color) \
907 (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be)
908
909 /*
910 * 1d-encode a row of pixels. The encoding is
911 * a sequence of all-white or all-black spans
912 * of pixels encoded with Huffman codes.
913 */
914 static int
915 Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits)
916 {
917 Fax3CodecState* sp = EncoderState(tif);
918 int32 span;
919 uint32 bs = 0;
920
921 for (;;) {
922 span = find0span(bp, bs, bits); /* white span */
923 putspan(tif, span, TIFFFaxWhiteCodes);
924 bs += span;
925 if (bs >= bits)
926 break;
927 span = find1span(bp, bs, bits); /* black span */
928 putspan(tif, span, TIFFFaxBlackCodes);
929 bs += span;
930 if (bs >= bits)
931 break;
932 }
933 if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) {
934 if (sp->bit != 8) /* byte-align */
935 Fax3FlushBits(tif, sp);
936 if ((sp->b.mode&FAXMODE_WORDALIGN) &&
937 !isAligned(tif->tif_rawcp, uint16))
938 Fax3FlushBits(tif, sp);
939 }
940 return (1);
941 }
942
943 static const tableentry horizcode =
944 { 3, 0x1, 0 }; /* 001 */
945 static const tableentry passcode =
946 { 4, 0x1, 0 }; /* 0001 */
947 static const tableentry vcodes[7] = {
948 { 7, 0x03, 0 }, /* 0000 011 */
949 { 6, 0x03, 0 }, /* 0000 11 */
950 { 3, 0x03, 0 }, /* 011 */
951 { 1, 0x1, 0 }, /* 1 */
952 { 3, 0x2, 0 }, /* 010 */
953 { 6, 0x02, 0 }, /* 0000 10 */
954 { 7, 0x02, 0 } /* 0000 010 */
955 };
956
957 /*
958 * 2d-encode a row of pixels. Consult the CCITT
959 * documentation for the algorithm.
960 */
961 static int
962 Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits)
963 {
964 #define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1)
965 uint32 a0 = 0;
966 uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0));
967 uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0));
968 uint32 a2, b2;
969
970 for (;;) {
971 b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1));
972 if (b2 >= a1) {
973 int32 d = b1 - a1;
974 if (!(-3 <= d && d <= 3)) { /* horizontal mode */
975 a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1));
976 putcode(tif, &horizcode);
977 if (a0+a1 == 0 || PIXEL(bp, a0) == 0) {
978 putspan(tif, a1-a0, TIFFFaxWhiteCodes);
979 putspan(tif, a2-a1, TIFFFaxBlackCodes);
980 } else {
981 putspan(tif, a1-a0, TIFFFaxBlackCodes);
982 putspan(tif, a2-a1, TIFFFaxWhiteCodes);
983 }
984 a0 = a2;
985 } else { /* vertical mode */
986 putcode(tif, &vcodes[d+3]);
987 a0 = a1;
988 }
989 } else { /* pass mode */
990 putcode(tif, &passcode);
991 a0 = b2;
992 }
993 if (a0 >= bits)
994 break;
995 a1 = finddiff(bp, a0, bits, PIXEL(bp,a0));
996 b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0));
997 b1 = finddiff(rp, b1, bits, PIXEL(bp,a0));
998 }
999 return (1);
1000 #undef PIXEL
1001 }
1002
1003 /*
1004 * Encode a buffer of pixels.
1005 */
1006 static int
1007 Fax3Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1008 {
1009 Fax3CodecState* sp = EncoderState(tif);
1010
1011 (void) s;
1012 while ((long)cc > 0) {
1013 if ((sp->b.mode & FAXMODE_NOEOL) == 0)
1014 Fax3PutEOL(tif);
1015 if (is2DEncoding(sp)) {
1016 if (sp->tag == G3_1D) {
1017 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1018 return (0);
1019 sp->tag = G3_2D;
1020 } else {
1021 if (!Fax3Encode2DRow(tif, bp, sp->refline,
1022 sp->b.rowpixels))
1023 return (0);
1024 sp->k--;
1025 }
1026 if (sp->k == 0) {
1027 sp->tag = G3_1D;
1028 sp->k = sp->maxk-1;
1029 } else
1030 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1031 } else {
1032 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1033 return (0);
1034 }
1035 bp += sp->b.rowbytes;
1036 cc -= sp->b.rowbytes;
1037 }
1038 return (1);
1039 }
1040
1041 static int
1042 Fax3PostEncode(TIFF* tif)
1043 {
1044 Fax3CodecState* sp = EncoderState(tif);
1045
1046 if (sp->bit != 8)
1047 Fax3FlushBits(tif, sp);
1048 return (1);
1049 }
1050
1051 static void
1052 Fax3Close(TIFF* tif)
1053 {
1054 if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) {
1055 Fax3CodecState* sp = EncoderState(tif);
1056 unsigned int code = EOL;
1057 unsigned int length = 12;
1058 int i;
1059
1060 if (is2DEncoding(sp))
1061 code = (code<<1) | (sp->tag == G3_1D), length++;
1062 for (i = 0; i < 6; i++)
1063 Fax3PutBits(tif, code, length);
1064 Fax3FlushBits(tif, sp);
1065 }
1066 }
1067
1068 static void
1069 Fax3Cleanup(TIFF* tif)
1070 {
1071 Fax3CodecState* sp = DecoderState(tif);
1072
1073 assert(sp != 0);
1074
1075 tif->tif_tagmethods.vgetfield = sp->b.vgetparent;
1076 tif->tif_tagmethods.vsetfield = sp->b.vsetparent;
1077
1078 if (sp->runs)
1079 _TIFFfree(sp->runs);
1080 if (sp->refline)
1081 _TIFFfree(sp->refline);
1082
1083 if (Fax3State(tif)->subaddress)
1084 _TIFFfree(Fax3State(tif)->subaddress);
1085 _TIFFfree(tif->tif_data);
1086 tif->tif_data = NULL;
1087
1088 _TIFFSetDefaultCompressionState(tif);
1089 }
1090
1091 #define FIELD_BADFAXLINES (FIELD_CODEC+0)
1092 #define FIELD_CLEANFAXDATA (FIELD_CODEC+1)
1093 #define FIELD_BADFAXRUN (FIELD_CODEC+2)
1094 #define FIELD_RECVPARAMS (FIELD_CODEC+3)
1095 #define FIELD_SUBADDRESS (FIELD_CODEC+4)
1096 #define FIELD_RECVTIME (FIELD_CODEC+5)
1097 #define FIELD_FAXDCS (FIELD_CODEC+6)
1098
1099 #define FIELD_OPTIONS (FIELD_CODEC+7)
1100
1101 static const TIFFFieldInfo faxFieldInfo[] = {
1102 { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, FIELD_PSEUDO,
1103 FALSE, FALSE, "FaxMode" },
1104 { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, FIELD_PSEUDO,
1105 FALSE, FALSE, "FaxFillFunc" },
1106 { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, FIELD_BADFAXLINES,
1107 TRUE, FALSE, "BadFaxLines" },
1108 { TIFFTAG_BADFAXLINES, 1, 1, TIFF_SHORT, FIELD_BADFAXLINES,
1109 TRUE, FALSE, "BadFaxLines" },
1110 { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, FIELD_CLEANFAXDATA,
1111 TRUE, FALSE, "CleanFaxData" },
1112 { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_LONG, FIELD_BADFAXRUN,
1113 TRUE, FALSE, "ConsecutiveBadFaxLines" },
1114 { TIFFTAG_CONSECUTIVEBADFAXLINES,1,1, TIFF_SHORT, FIELD_BADFAXRUN,
1115 TRUE, FALSE, "ConsecutiveBadFaxLines" },
1116 { TIFFTAG_FAXRECVPARAMS, 1, 1, TIFF_LONG, FIELD_RECVPARAMS,
1117 TRUE, FALSE, "FaxRecvParams" },
1118 { TIFFTAG_FAXSUBADDRESS, -1,-1, TIFF_ASCII, FIELD_SUBADDRESS,
1119 TRUE, FALSE, "FaxSubAddress" },
1120 { TIFFTAG_FAXRECVTIME, 1, 1, TIFF_LONG, FIELD_RECVTIME,
1121 TRUE, FALSE, "FaxRecvTime" },
1122 { TIFFTAG_FAXDCS, -1,-1, TIFF_ASCII, FIELD_FAXDCS,
1123 TRUE, FALSE, "FaxDcs" },
1124 };
1125 static const TIFFFieldInfo fax3FieldInfo[] = {
1126 { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
1127 FALSE, FALSE, "Group3Options" },
1128 };
1129 static const TIFFFieldInfo fax4FieldInfo[] = {
1130 { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, FIELD_OPTIONS,
1131 FALSE, FALSE, "Group4Options" },
1132 };
1133 #define N(a) (sizeof (a) / sizeof (a[0]))
1134
1135 static int
1136 Fax3VSetField(TIFF* tif, ttag_t tag, va_list ap)
1137 {
1138 Fax3BaseState* sp = Fax3State(tif);
1139
1140 assert(sp != 0);
1141 assert(sp->vsetparent != 0);
1142
1143 switch (tag) {
1144 case TIFFTAG_FAXMODE:
1145 sp->mode = va_arg(ap, int);
1146 return (1); /* NB: pseudo tag */
1147 case TIFFTAG_FAXFILLFUNC:
1148 DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc);
1149 return (1); /* NB: pseudo tag */
1150 case TIFFTAG_GROUP3OPTIONS:
1151 /* XXX: avoid reading options if compression mismatches. */
1152 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3)
1153 sp->groupoptions = va_arg(ap, uint32);
1154 break;
1155 case TIFFTAG_GROUP4OPTIONS:
1156 /* XXX: avoid reading options if compression mismatches. */
1157 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1158 sp->groupoptions = va_arg(ap, uint32);
1159 break;
1160 case TIFFTAG_BADFAXLINES:
1161 sp->badfaxlines = va_arg(ap, uint32);
1162 break;
1163 case TIFFTAG_CLEANFAXDATA:
1164 sp->cleanfaxdata = (uint16) va_arg(ap, int);
1165 break;
1166 case TIFFTAG_CONSECUTIVEBADFAXLINES:
1167 sp->badfaxrun = va_arg(ap, uint32);
1168 break;
1169 case TIFFTAG_FAXRECVPARAMS:
1170 sp->recvparams = va_arg(ap, uint32);
1171 break;
1172 case TIFFTAG_FAXSUBADDRESS:
1173 _TIFFsetString(&sp->subaddress, va_arg(ap, char*));
1174 break;
1175 case TIFFTAG_FAXRECVTIME:
1176 sp->recvtime = va_arg(ap, uint32);
1177 break;
1178 case TIFFTAG_FAXDCS:
1179 _TIFFsetString(&sp->faxdcs, va_arg(ap, char*));
1180 break;
1181 default:
1182 return (*sp->vsetparent)(tif, tag, ap);
1183 }
1184 TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
1185 tif->tif_flags |= TIFF_DIRTYDIRECT;
1186 return (1);
1187 }
1188
1189 static int
1190 Fax3VGetField(TIFF* tif, ttag_t tag, va_list ap)
1191 {
1192 Fax3BaseState* sp = Fax3State(tif);
1193
1194 switch (tag) {
1195 case TIFFTAG_FAXMODE:
1196 *va_arg(ap, int*) = sp->mode;
1197 break;
1198 case TIFFTAG_FAXFILLFUNC:
1199 *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill;
1200 break;
1201 case TIFFTAG_GROUP3OPTIONS:
1202 case TIFFTAG_GROUP4OPTIONS:
1203 *va_arg(ap, uint32*) = sp->groupoptions;
1204 break;
1205 case TIFFTAG_BADFAXLINES:
1206 *va_arg(ap, uint32*) = sp->badfaxlines;
1207 break;
1208 case TIFFTAG_CLEANFAXDATA:
1209 *va_arg(ap, uint16*) = sp->cleanfaxdata;
1210 break;
1211 case TIFFTAG_CONSECUTIVEBADFAXLINES:
1212 *va_arg(ap, uint32*) = sp->badfaxrun;
1213 break;
1214 case TIFFTAG_FAXRECVPARAMS:
1215 *va_arg(ap, uint32*) = sp->recvparams;
1216 break;
1217 case TIFFTAG_FAXSUBADDRESS:
1218 *va_arg(ap, char**) = sp->subaddress;
1219 break;
1220 case TIFFTAG_FAXRECVTIME:
1221 *va_arg(ap, uint32*) = sp->recvtime;
1222 break;
1223 case TIFFTAG_FAXDCS:
1224 *va_arg(ap, char**) = sp->faxdcs;
1225 break;
1226 default:
1227 return (*sp->vgetparent)(tif, tag, ap);
1228 }
1229 return (1);
1230 }
1231
1232 static void
1233 Fax3PrintDir(TIFF* tif, FILE* fd, long flags)
1234 {
1235 Fax3BaseState* sp = Fax3State(tif);
1236
1237 (void) flags;
1238 if (TIFFFieldSet(tif,FIELD_OPTIONS)) {
1239 const char* sep = " ";
1240 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) {
1241 fprintf(fd, " Group 4 Options:");
1242 if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED)
1243 fprintf(fd, "%suncompressed data", sep);
1244 } else {
1245
1246 fprintf(fd, " Group 3 Options:");
1247 if (sp->groupoptions & GROUP3OPT_2DENCODING)
1248 fprintf(fd, "%s2-d encoding", sep), sep = "+";
1249 if (sp->groupoptions & GROUP3OPT_FILLBITS)
1250 fprintf(fd, "%sEOL padding", sep), sep = "+";
1251 if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED)
1252 fprintf(fd, "%suncompressed data", sep);
1253 }
1254 fprintf(fd, " (%lu = 0x%lx)\n",
1255 (unsigned long) sp->groupoptions,
1256 (unsigned long) sp->groupoptions);
1257 }
1258 if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) {
1259 fprintf(fd, " Fax Data:");
1260 switch (sp->cleanfaxdata) {
1261 case CLEANFAXDATA_CLEAN:
1262 fprintf(fd, " clean");
1263 break;
1264 case CLEANFAXDATA_REGENERATED:
1265 fprintf(fd, " receiver regenerated");
1266 break;
1267 case CLEANFAXDATA_UNCLEAN:
1268 fprintf(fd, " uncorrected errors");
1269 break;
1270 }
1271 fprintf(fd, " (%u = 0x%x)\n",
1272 sp->cleanfaxdata, sp->cleanfaxdata);
1273 }
1274 if (TIFFFieldSet(tif,FIELD_BADFAXLINES))
1275 fprintf(fd, " Bad Fax Lines: %lu\n",
1276 (unsigned long) sp->badfaxlines);
1277 if (TIFFFieldSet(tif,FIELD_BADFAXRUN))
1278 fprintf(fd, " Consecutive Bad Fax Lines: %lu\n",
1279 (unsigned long) sp->badfaxrun);
1280 if (TIFFFieldSet(tif,FIELD_RECVPARAMS))
1281 fprintf(fd, " Fax Receive Parameters: %08lx\n",
1282 (unsigned long) sp->recvparams);
1283 if (TIFFFieldSet(tif,FIELD_SUBADDRESS))
1284 fprintf(fd, " Fax SubAddress: %s\n", sp->subaddress);
1285 if (TIFFFieldSet(tif,FIELD_RECVTIME))
1286 fprintf(fd, " Fax Receive Time: %lu secs\n",
1287 (unsigned long) sp->recvtime);
1288 if (TIFFFieldSet(tif,FIELD_FAXDCS))
1289 fprintf(fd, " Fax DCS: %s\n", sp->faxdcs);
1290 }
1291
1292 static int
1293 InitCCITTFax3(TIFF* tif)
1294 {
1295 Fax3BaseState* sp;
1296
1297 /*
1298 * Allocate state block so tag methods have storage to record values.
1299 */
1300 tif->tif_data = (tidata_t)
1301 _TIFFmalloc(sizeof (Fax3CodecState));
1302
1303 if (tif->tif_data == NULL) {
1304 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3",
1305 "%s: No space for state block", tif->tif_name);
1306 return (0);
1307 }
1308
1309 sp = Fax3State(tif);
1310 sp->rw_mode = tif->tif_mode;
1311
1312 /*
1313 * Merge codec-specific tag information and
1314 * override parent get/set field methods.
1315 */
1316 _TIFFMergeFieldInfo(tif, faxFieldInfo, N(faxFieldInfo));
1317 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1318 tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */
1319 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1320 tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */
1321 tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */
1322 sp->groupoptions = 0;
1323 sp->recvparams = 0;
1324 sp->subaddress = NULL;
1325 sp->faxdcs = NULL;
1326
1327 if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */
1328 tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */
1329 DecoderState(tif)->runs = NULL;
1330 TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns);
1331 EncoderState(tif)->refline = NULL;
1332
1333 /*
1334 * Install codec methods.
1335 */
1336 tif->tif_setupdecode = Fax3SetupState;
1337 tif->tif_predecode = Fax3PreDecode;
1338 tif->tif_decoderow = Fax3Decode1D;
1339 tif->tif_decodestrip = Fax3Decode1D;
1340 tif->tif_decodetile = Fax3Decode1D;
1341 tif->tif_setupencode = Fax3SetupState;
1342 tif->tif_preencode = Fax3PreEncode;
1343 tif->tif_postencode = Fax3PostEncode;
1344 tif->tif_encoderow = Fax3Encode;
1345 tif->tif_encodestrip = Fax3Encode;
1346 tif->tif_encodetile = Fax3Encode;
1347 tif->tif_close = Fax3Close;
1348 tif->tif_cleanup = Fax3Cleanup;
1349
1350 return (1);
1351 }
1352
1353 int
1354 TIFFInitCCITTFax3(TIFF* tif, int scheme)
1355 {
1356 (void) scheme;
1357 if (InitCCITTFax3(tif)) {
1358 _TIFFMergeFieldInfo(tif, fax3FieldInfo, N(fax3FieldInfo));
1359
1360 /*
1361 * The default format is Class/F-style w/o RTC.
1362 */
1363 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
1364 } else
1365 return (0);
1366 }
1367
1368 /*
1369 * CCITT Group 4 (T.6) Facsimile-compatible
1370 * Compression Scheme Support.
1371 */
1372
1373 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
1374 /*
1375 * Decode the requested amount of G4-encoded data.
1376 */
1377 static int
1378 Fax4Decode(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
1379 {
1380 DECLARE_STATE_2D(tif, sp, "Fax4Decode");
1381 int line = 0;
1382
1383 (void) s;
1384 CACHE_STATE(tif, sp);
1385 while ((long)occ > 0) {
1386 a0 = 0;
1387 RunLength = 0;
1388 pa = thisrun = sp->curruns;
1389 pb = sp->refruns;
1390 b1 = *pb++;
1391 #ifdef FAX3_DEBUG
1392 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1393 printf("-------------------- %d\n", tif->tif_row);
1394 fflush(stdout);
1395 #endif
1396 EXPAND2D(EOFG4);
1397 if (EOLcnt)
1398 goto EOFG4;
1399 (*sp->fill)(buf, thisrun, pa, lastx);
1400 SETVALUE(0); /* imaginary change for reference */
1401 SWAP(uint32*, sp->curruns, sp->refruns);
1402 buf += sp->b.rowbytes;
1403 occ -= sp->b.rowbytes;
1404 line++;
1405 continue;
1406 EOFG4:
1407 NeedBits16( 13, BADG4 );
1408 BADG4:
1409 #ifdef FAX3_DEBUG
1410 if( GetBits(13) != 0x1001 )
1411 fputs( "Bad RTC\n", stderr );
1412 #endif
1413 ClrBits( 13 );
1414 (*sp->fill)(buf, thisrun, pa, lastx);
1415 UNCACHE_STATE(tif, sp);
1416 return (-1);
1417 }
1418 UNCACHE_STATE(tif, sp);
1419 return (1);
1420 }
1421 #undef SWAP
1422
1423 /*
1424 * Encode the requested amount of data.
1425 */
1426 static int
1427 Fax4Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1428 {
1429 Fax3CodecState *sp = EncoderState(tif);
1430
1431 (void) s;
1432 while ((long)cc > 0) {
1433 if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1434 return (0);
1435 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1436 bp += sp->b.rowbytes;
1437 cc -= sp->b.rowbytes;
1438 }
1439 return (1);
1440 }
1441
1442 static int
1443 Fax4PostEncode(TIFF* tif)
1444 {
1445 Fax3CodecState *sp = EncoderState(tif);
1446
1447 /* terminate strip w/ EOFB */
1448 Fax3PutBits(tif, EOL, 12);
1449 Fax3PutBits(tif, EOL, 12);
1450 if (sp->bit != 8)
1451 Fax3FlushBits(tif, sp);
1452 return (1);
1453 }
1454
1455 int
1456 TIFFInitCCITTFax4(TIFF* tif, int scheme)
1457 {
1458 (void) scheme;
1459 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1460 _TIFFMergeFieldInfo(tif, fax4FieldInfo, N(fax4FieldInfo));
1461
1462 tif->tif_decoderow = Fax4Decode;
1463 tif->tif_decodestrip = Fax4Decode;
1464 tif->tif_decodetile = Fax4Decode;
1465 tif->tif_encoderow = Fax4Encode;
1466 tif->tif_encodestrip = Fax4Encode;
1467 tif->tif_encodetile = Fax4Encode;
1468 tif->tif_postencode = Fax4PostEncode;
1469 /*
1470 * Suppress RTC at the end of each strip.
1471 */
1472 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC);
1473 } else
1474 return (0);
1475 }
1476
1477 /*
1478 * CCITT Group 3 1-D Modified Huffman RLE Compression Support.
1479 * (Compression algorithms 2 and 32771)
1480 */
1481
1482 /*
1483 * Decode the requested amount of RLE-encoded data.
1484 */
1485 static int
1486 Fax3DecodeRLE(TIFF* tif, tidata_t buf, tsize_t occ, tsample_t s)
1487 {
1488 DECLARE_STATE(tif, sp, "Fax3DecodeRLE");
1489 int mode = sp->b.mode;
1490 int line = 0;
1491
1492 (void) s;
1493 CACHE_STATE(tif, sp);
1494 thisrun = sp->curruns;
1495 while ((long)occ > 0) {
1496 a0 = 0;
1497 RunLength = 0;
1498 pa = thisrun;
1499 #ifdef FAX3_DEBUG
1500 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1501 printf("-------------------- %d\n", tif->tif_row);
1502 fflush(stdout);
1503 #endif
1504 EXPAND1D(EOFRLE);
1505 (*sp->fill)(buf, thisrun, pa, lastx);
1506 /*
1507 * Cleanup at the end of the row.
1508 */
1509 if (mode & FAXMODE_BYTEALIGN) {
1510 int n = BitsAvail - (BitsAvail &~ 7);
1511 ClrBits(n);
1512 } else if (mode & FAXMODE_WORDALIGN) {
1513 int n = BitsAvail - (BitsAvail &~ 15);
1514 ClrBits(n);
1515 if (BitsAvail == 0 && !isAligned(cp, uint16))
1516 cp++;
1517 }
1518 buf += sp->b.rowbytes;
1519 occ -= sp->b.rowbytes;
1520 line++;
1521 continue;
1522 EOFRLE: /* premature EOF */
1523 (*sp->fill)(buf, thisrun, pa, lastx);
1524 UNCACHE_STATE(tif, sp);
1525 return (-1);
1526 }
1527 UNCACHE_STATE(tif, sp);
1528 return (1);
1529 }
1530
1531 int
1532 TIFFInitCCITTRLE(TIFF* tif, int scheme)
1533 {
1534 (void) scheme;
1535 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1536 tif->tif_decoderow = Fax3DecodeRLE;
1537 tif->tif_decodestrip = Fax3DecodeRLE;
1538 tif->tif_decodetile = Fax3DecodeRLE;
1539 /*
1540 * Suppress RTC+EOLs when encoding and byte-align data.
1541 */
1542 return TIFFSetField(tif, TIFFTAG_FAXMODE,
1543 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN);
1544 } else
1545 return (0);
1546 }
1547
1548 int
1549 TIFFInitCCITTRLEW(TIFF* tif, int scheme)
1550 {
1551 (void) scheme;
1552 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1553 tif->tif_decoderow = Fax3DecodeRLE;
1554 tif->tif_decodestrip = Fax3DecodeRLE;
1555 tif->tif_decodetile = Fax3DecodeRLE;
1556 /*
1557 * Suppress RTC+EOLs when encoding and word-align data.
1558 */
1559 return TIFFSetField(tif, TIFFTAG_FAXMODE,
1560 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN);
1561 } else
1562 return (0);
1563 }
1564 #endif /* CCITT_SUPPORT */
1565
1566 /* vim: set ts=8 sts=8 sw=8 noet: */
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