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[reactos.git] / reactos / dll / 3rdparty / libtiff / tif_fax3.c
1 /* $Id: tif_fax3.c,v 1.74 2012-06-21 02:01:31 fwarmerdam Exp $ */
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 <precomp.h>
28
29 #ifdef CCITT_SUPPORT
30 /*
31 * TIFF Library.
32 *
33 * CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support.
34 *
35 * This file contains support for decoding and encoding TIFF
36 * compression algorithms 2, 3, 4, and 32771.
37 *
38 * Decoder support is derived, with permission, from the code
39 * in Frank Cringle's viewfax program;
40 * Copyright (C) 1990, 1995 Frank D. Cringle.
41 */
42 #include "tif_fax3.h"
43 #define G3CODES
44 #include "t4.h"
45 #include <stdio.h>
46
47 /*
48 * Compression+decompression state blocks are
49 * derived from this ``base state'' block.
50 */
51 typedef struct {
52 int rw_mode; /* O_RDONLY for decode, else encode */
53 int mode; /* operating mode */
54 tmsize_t rowbytes; /* bytes in a decoded scanline */
55 uint32 rowpixels; /* pixels in a scanline */
56
57 uint16 cleanfaxdata; /* CleanFaxData tag */
58 uint32 badfaxrun; /* BadFaxRun tag */
59 uint32 badfaxlines; /* BadFaxLines tag */
60 uint32 groupoptions; /* Group 3/4 options tag */
61
62 TIFFVGetMethod vgetparent; /* super-class method */
63 TIFFVSetMethod vsetparent; /* super-class method */
64 TIFFPrintMethod printdir; /* super-class method */
65 } Fax3BaseState;
66 #define Fax3State(tif) ((Fax3BaseState*) (tif)->tif_data)
67
68 typedef enum { G3_1D, G3_2D } Ttag;
69 typedef struct {
70 Fax3BaseState b;
71
72 /* Decoder state info */
73 const unsigned char* bitmap; /* bit reversal table */
74 uint32 data; /* current i/o byte/word */
75 int bit; /* current i/o bit in byte */
76 int EOLcnt; /* count of EOL codes recognized */
77 TIFFFaxFillFunc fill; /* fill routine */
78 uint32* runs; /* b&w runs for current/previous row */
79 uint32* refruns; /* runs for reference line */
80 uint32* curruns; /* runs for current line */
81
82 /* Encoder state info */
83 Ttag tag; /* encoding state */
84 unsigned char* refline; /* reference line for 2d decoding */
85 int k; /* #rows left that can be 2d encoded */
86 int maxk; /* max #rows that can be 2d encoded */
87
88 int line;
89 } Fax3CodecState;
90 #define DecoderState(tif) ((Fax3CodecState*) Fax3State(tif))
91 #define EncoderState(tif) ((Fax3CodecState*) Fax3State(tif))
92
93 #define is2DEncoding(sp) (sp->b.groupoptions & GROUP3OPT_2DENCODING)
94 #define isAligned(p,t) ((((size_t)(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 -= (tmsize_t)((uint8*) cp - tif->tif_rawcp); \
141 tif->tif_rawcp = (uint8*) cp; \
142 } while (0)
143
144 /*
145 * Setup state for decoding a strip.
146 */
147 static int
148 Fax3PreDecode(TIFF* tif, uint16 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 sp->line = 0;
171 return (1);
172 }
173
174 /*
175 * Routine for handling various errors/conditions.
176 * Note how they are "glued into the decoder" by
177 * overriding the definitions used by the decoder.
178 */
179
180 static void
181 Fax3Unexpected(const char* module, TIFF* tif, uint32 line, uint32 a0)
182 {
183 TIFFErrorExt(tif->tif_clientdata, module, "Bad code word at line %u of %s %u (x %u)",
184 line, isTiled(tif) ? "tile" : "strip",
185 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
186 a0);
187 }
188 #define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0)
189
190 static void
191 Fax3Extension(const char* module, TIFF* tif, uint32 line, uint32 a0)
192 {
193 TIFFErrorExt(tif->tif_clientdata, module,
194 "Uncompressed data (not supported) at line %u of %s %u (x %u)",
195 line, isTiled(tif) ? "tile" : "strip",
196 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
197 a0);
198 }
199 #define extension(a0) Fax3Extension(module, tif, sp->line, a0)
200
201 static void
202 Fax3BadLength(const char* module, TIFF* tif, uint32 line, uint32 a0, uint32 lastx)
203 {
204 TIFFWarningExt(tif->tif_clientdata, module, "%s at line %u of %s %u (got %u, expected %u)",
205 a0 < lastx ? "Premature EOL" : "Line length mismatch",
206 line, isTiled(tif) ? "tile" : "strip",
207 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
208 a0, lastx);
209 }
210 #define badlength(a0,lastx) Fax3BadLength(module, tif, sp->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, "Premature EOF at line %u of %s %u (x %u)",
216 line, isTiled(tif) ? "tile" : "strip",
217 (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip),
218 a0);
219 }
220 #define prematureEOF(a0) Fax3PrematureEOF(module, tif, sp->line, a0)
221
222 #define Nop
223
224 /*
225 * Decode the requested amount of G3 1D-encoded data.
226 */
227 static int
228 Fax3Decode1D(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
229 {
230 DECLARE_STATE(tif, sp, "Fax3Decode1D");
231 (void) s;
232 if (occ % sp->b.rowbytes)
233 {
234 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read");
235 return (-1);
236 }
237 CACHE_STATE(tif, sp);
238 thisrun = sp->curruns;
239 while (occ > 0) {
240 a0 = 0;
241 RunLength = 0;
242 pa = thisrun;
243 #ifdef FAX3_DEBUG
244 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
245 printf("-------------------- %d\n", tif->tif_row);
246 fflush(stdout);
247 #endif
248 SYNC_EOL(EOF1D);
249 EXPAND1D(EOF1Da);
250 (*sp->fill)(buf, thisrun, pa, lastx);
251 buf += sp->b.rowbytes;
252 occ -= sp->b.rowbytes;
253 sp->line++;
254 continue;
255 EOF1D: /* premature EOF */
256 CLEANUP_RUNS();
257 EOF1Da: /* premature EOF */
258 (*sp->fill)(buf, thisrun, pa, lastx);
259 UNCACHE_STATE(tif, sp);
260 return (-1);
261 }
262 UNCACHE_STATE(tif, sp);
263 return (1);
264 }
265
266 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
267 /*
268 * Decode the requested amount of G3 2D-encoded data.
269 */
270 static int
271 Fax3Decode2D(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
272 {
273 DECLARE_STATE_2D(tif, sp, "Fax3Decode2D");
274 int is1D; /* current line is 1d/2d-encoded */
275 (void) s;
276 if (occ % sp->b.rowbytes)
277 {
278 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read");
279 return (-1);
280 }
281 CACHE_STATE(tif, sp);
282 while (occ > 0) {
283 a0 = 0;
284 RunLength = 0;
285 pa = thisrun = sp->curruns;
286 #ifdef FAX3_DEBUG
287 printf("\nBitAcc=%08X, BitsAvail = %d EOLcnt = %d",
288 BitAcc, BitsAvail, EOLcnt);
289 #endif
290 SYNC_EOL(EOF2D);
291 NeedBits8(1, EOF2D);
292 is1D = GetBits(1); /* 1D/2D-encoding tag bit */
293 ClrBits(1);
294 #ifdef FAX3_DEBUG
295 printf(" %s\n-------------------- %d\n",
296 is1D ? "1D" : "2D", tif->tif_row);
297 fflush(stdout);
298 #endif
299 pb = sp->refruns;
300 b1 = *pb++;
301 if (is1D)
302 EXPAND1D(EOF2Da);
303 else
304 EXPAND2D(EOF2Da);
305 (*sp->fill)(buf, thisrun, pa, lastx);
306 SETVALUE(0); /* imaginary change for reference */
307 SWAP(uint32*, sp->curruns, sp->refruns);
308 buf += sp->b.rowbytes;
309 occ -= sp->b.rowbytes;
310 sp->line++;
311 continue;
312 EOF2D: /* premature EOF */
313 CLEANUP_RUNS();
314 EOF2Da: /* premature EOF */
315 (*sp->fill)(buf, thisrun, pa, lastx);
316 UNCACHE_STATE(tif, sp);
317 return (-1);
318 }
319 UNCACHE_STATE(tif, sp);
320 return (1);
321 }
322 #undef SWAP
323
324 /*
325 * The ZERO & FILL macros must handle spans < 2*sizeof(long) bytes.
326 * For machines with 64-bit longs this is <16 bytes; otherwise
327 * this is <8 bytes. We optimize the code here to reflect the
328 * machine characteristics.
329 */
330 #if SIZEOF_UNSIGNED_LONG == 8
331 # define FILL(n, cp) \
332 switch (n) { \
333 case 15:(cp)[14] = 0xff; case 14:(cp)[13] = 0xff; case 13: (cp)[12] = 0xff;\
334 case 12:(cp)[11] = 0xff; case 11:(cp)[10] = 0xff; case 10: (cp)[9] = 0xff;\
335 case 9: (cp)[8] = 0xff; case 8: (cp)[7] = 0xff; case 7: (cp)[6] = 0xff;\
336 case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; case 4: (cp)[3] = 0xff;\
337 case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
338 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
339 }
340 # define ZERO(n, cp) \
341 switch (n) { \
342 case 15:(cp)[14] = 0; case 14:(cp)[13] = 0; case 13: (cp)[12] = 0; \
343 case 12:(cp)[11] = 0; case 11:(cp)[10] = 0; case 10: (cp)[9] = 0; \
344 case 9: (cp)[8] = 0; case 8: (cp)[7] = 0; case 7: (cp)[6] = 0; \
345 case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; case 4: (cp)[3] = 0; \
346 case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
347 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
348 }
349 #else
350 # define FILL(n, cp) \
351 switch (n) { \
352 case 7: (cp)[6] = 0xff; case 6: (cp)[5] = 0xff; case 5: (cp)[4] = 0xff; \
353 case 4: (cp)[3] = 0xff; case 3: (cp)[2] = 0xff; case 2: (cp)[1] = 0xff; \
354 case 1: (cp)[0] = 0xff; (cp) += (n); case 0: ; \
355 }
356 # define ZERO(n, cp) \
357 switch (n) { \
358 case 7: (cp)[6] = 0; case 6: (cp)[5] = 0; case 5: (cp)[4] = 0; \
359 case 4: (cp)[3] = 0; case 3: (cp)[2] = 0; case 2: (cp)[1] = 0; \
360 case 1: (cp)[0] = 0; (cp) += (n); case 0: ; \
361 }
362 #endif
363
364 /*
365 * Bit-fill a row according to the white/black
366 * runs generated during G3/G4 decoding.
367 */
368 void
369 _TIFFFax3fillruns(unsigned char* buf, uint32* runs, uint32* erun, uint32 lastx)
370 {
371 static const unsigned char _fillmasks[] =
372 { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
373 unsigned char* cp;
374 uint32 x, bx, run;
375 int32 n, nw;
376 long* lp;
377
378 if ((erun-runs)&1)
379 *erun++ = 0;
380 x = 0;
381 for (; runs < erun; runs += 2) {
382 run = runs[0];
383 if (x+run > lastx || run > lastx )
384 run = runs[0] = (uint32) (lastx - x);
385 if (run) {
386 cp = buf + (x>>3);
387 bx = x&7;
388 if (run > 8-bx) {
389 if (bx) { /* align to byte boundary */
390 *cp++ &= 0xff << (8-bx);
391 run -= 8-bx;
392 }
393 if( (n = run >> 3) != 0 ) { /* multiple bytes to fill */
394 if ((n/sizeof (long)) > 1) {
395 /*
396 * Align to longword boundary and fill.
397 */
398 for (; n && !isAligned(cp, long); n--)
399 *cp++ = 0x00;
400 lp = (long*) cp;
401 nw = (int32)(n / sizeof (long));
402 n -= nw * sizeof (long);
403 do {
404 *lp++ = 0L;
405 } while (--nw);
406 cp = (unsigned char*) lp;
407 }
408 ZERO(n, cp);
409 run &= 7;
410 }
411 if (run)
412 cp[0] &= 0xff >> run;
413 } else
414 cp[0] &= ~(_fillmasks[run]>>bx);
415 x += runs[0];
416 }
417 run = runs[1];
418 if (x+run > lastx || run > lastx )
419 run = runs[1] = lastx - x;
420 if (run) {
421 cp = buf + (x>>3);
422 bx = x&7;
423 if (run > 8-bx) {
424 if (bx) { /* align to byte boundary */
425 *cp++ |= 0xff >> bx;
426 run -= 8-bx;
427 }
428 if( (n = run>>3) != 0 ) { /* multiple bytes to fill */
429 if ((n/sizeof (long)) > 1) {
430 /*
431 * Align to longword boundary and fill.
432 */
433 for (; n && !isAligned(cp, long); n--)
434 *cp++ = 0xff;
435 lp = (long*) cp;
436 nw = (int32)(n / sizeof (long));
437 n -= nw * sizeof (long);
438 do {
439 *lp++ = -1L;
440 } while (--nw);
441 cp = (unsigned char*) lp;
442 }
443 FILL(n, cp);
444 run &= 7;
445 }
446 if (run)
447 cp[0] |= 0xff00 >> run;
448 } else
449 cp[0] |= _fillmasks[run]>>bx;
450 x += runs[1];
451 }
452 }
453 assert(x == lastx);
454 }
455 #undef ZERO
456 #undef FILL
457
458 static int
459 Fax3FixupTags(TIFF* tif)
460 {
461 (void) tif;
462 return (1);
463 }
464
465 /*
466 * Setup G3/G4-related compression/decompression state
467 * before data is processed. This routine is called once
468 * per image -- it sets up different state based on whether
469 * or not decoding or encoding is being done and whether
470 * 1D- or 2D-encoded data is involved.
471 */
472 static int
473 Fax3SetupState(TIFF* tif)
474 {
475 static const char module[] = "Fax3SetupState";
476 TIFFDirectory* td = &tif->tif_dir;
477 Fax3BaseState* sp = Fax3State(tif);
478 int needsRefLine;
479 Fax3CodecState* dsp = (Fax3CodecState*) Fax3State(tif);
480 tmsize_t rowbytes;
481 uint32 rowpixels, nruns;
482
483 if (td->td_bitspersample != 1) {
484 TIFFErrorExt(tif->tif_clientdata, module,
485 "Bits/sample must be 1 for Group 3/4 encoding/decoding");
486 return (0);
487 }
488 /*
489 * Calculate the scanline/tile widths.
490 */
491 if (isTiled(tif)) {
492 rowbytes = TIFFTileRowSize(tif);
493 rowpixels = td->td_tilewidth;
494 } else {
495 rowbytes = TIFFScanlineSize(tif);
496 rowpixels = td->td_imagewidth;
497 }
498 sp->rowbytes = rowbytes;
499 sp->rowpixels = rowpixels;
500 /*
501 * Allocate any additional space required for decoding/encoding.
502 */
503 needsRefLine = (
504 (sp->groupoptions & GROUP3OPT_2DENCODING) ||
505 td->td_compression == COMPRESSION_CCITTFAX4
506 );
507
508 /*
509 Assure that allocation computations do not overflow.
510
511 TIFFroundup and TIFFSafeMultiply return zero on integer overflow
512 */
513 dsp->runs=(uint32*) NULL;
514 nruns = TIFFroundup_32(rowpixels,32);
515 if (needsRefLine) {
516 nruns = TIFFSafeMultiply(uint32,nruns,2);
517 }
518 if ((nruns == 0) || (TIFFSafeMultiply(uint32,nruns,2) == 0)) {
519 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
520 "Row pixels integer overflow (rowpixels %u)",
521 rowpixels);
522 return (0);
523 }
524 dsp->runs = (uint32*) _TIFFCheckMalloc(tif,
525 TIFFSafeMultiply(uint32,nruns,2),
526 sizeof (uint32),
527 "for Group 3/4 run arrays");
528 if (dsp->runs == NULL)
529 return (0);
530 memset( dsp->runs, 0, TIFFSafeMultiply(uint32,nruns,2)*sizeof(uint32));
531 dsp->curruns = dsp->runs;
532 if (needsRefLine)
533 dsp->refruns = dsp->runs + nruns;
534 else
535 dsp->refruns = NULL;
536 if (td->td_compression == COMPRESSION_CCITTFAX3
537 && is2DEncoding(dsp)) { /* NB: default is 1D routine */
538 tif->tif_decoderow = Fax3Decode2D;
539 tif->tif_decodestrip = Fax3Decode2D;
540 tif->tif_decodetile = Fax3Decode2D;
541 }
542
543 if (needsRefLine) { /* 2d encoding */
544 Fax3CodecState* esp = EncoderState(tif);
545 /*
546 * 2d encoding requires a scanline
547 * buffer for the ``reference line''; the
548 * scanline against which delta encoding
549 * is referenced. The reference line must
550 * be initialized to be ``white'' (done elsewhere).
551 */
552 esp->refline = (unsigned char*) _TIFFmalloc(rowbytes);
553 if (esp->refline == NULL) {
554 TIFFErrorExt(tif->tif_clientdata, module,
555 "No space for Group 3/4 reference line");
556 return (0);
557 }
558 } else /* 1d encoding */
559 EncoderState(tif)->refline = NULL;
560
561 return (1);
562 }
563
564 /*
565 * CCITT Group 3 FAX Encoding.
566 */
567
568 #define Fax3FlushBits(tif, sp) { \
569 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
570 (void) TIFFFlushData1(tif); \
571 *(tif)->tif_rawcp++ = (uint8) (sp)->data; \
572 (tif)->tif_rawcc++; \
573 (sp)->data = 0, (sp)->bit = 8; \
574 }
575 #define _FlushBits(tif) { \
576 if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
577 (void) TIFFFlushData1(tif); \
578 *(tif)->tif_rawcp++ = (uint8) data; \
579 (tif)->tif_rawcc++; \
580 data = 0, bit = 8; \
581 }
582 static const int _msbmask[9] =
583 { 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff };
584 #define _PutBits(tif, bits, length) { \
585 while (length > bit) { \
586 data |= bits >> (length - bit); \
587 length -= bit; \
588 _FlushBits(tif); \
589 } \
590 assert( length < 9 ); \
591 data |= (bits & _msbmask[length]) << (bit - length); \
592 bit -= length; \
593 if (bit == 0) \
594 _FlushBits(tif); \
595 }
596
597 /*
598 * Write a variable-length bit-value to
599 * the output stream. Values are
600 * assumed to be at most 16 bits.
601 */
602 static void
603 Fax3PutBits(TIFF* tif, unsigned int bits, unsigned int length)
604 {
605 Fax3CodecState* sp = EncoderState(tif);
606 unsigned int bit = sp->bit;
607 int data = sp->data;
608
609 _PutBits(tif, bits, length);
610
611 sp->data = data;
612 sp->bit = bit;
613 }
614
615 /*
616 * Write a code to the output stream.
617 */
618 #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
619
620 #ifdef FAX3_DEBUG
621 #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
622 #define DEBUG_PRINT(what,len) { \
623 int t; \
624 printf("%08X/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), len); \
625 for (t = length-1; t >= 0; t--) \
626 putchar(code & (1<<t) ? '1' : '0'); \
627 putchar('\n'); \
628 }
629 #endif
630
631 /*
632 * Write the sequence of codes that describes
633 * the specified span of zero's or one's. The
634 * appropriate table that holds the make-up and
635 * terminating codes is supplied.
636 */
637 static void
638 putspan(TIFF* tif, int32 span, const tableentry* tab)
639 {
640 Fax3CodecState* sp = EncoderState(tif);
641 unsigned int bit = sp->bit;
642 int data = sp->data;
643 unsigned int code, length;
644
645 while (span >= 2624) {
646 const tableentry* te = &tab[63 + (2560>>6)];
647 code = te->code, length = te->length;
648 #ifdef FAX3_DEBUG
649 DEBUG_PRINT("MakeUp", te->runlen);
650 #endif
651 _PutBits(tif, code, length);
652 span -= te->runlen;
653 }
654 if (span >= 64) {
655 const tableentry* te = &tab[63 + (span>>6)];
656 assert(te->runlen == 64*(span>>6));
657 code = te->code, length = te->length;
658 #ifdef FAX3_DEBUG
659 DEBUG_PRINT("MakeUp", te->runlen);
660 #endif
661 _PutBits(tif, code, length);
662 span -= te->runlen;
663 }
664 code = tab[span].code, length = tab[span].length;
665 #ifdef FAX3_DEBUG
666 DEBUG_PRINT(" Term", tab[span].runlen);
667 #endif
668 _PutBits(tif, code, length);
669
670 sp->data = data;
671 sp->bit = bit;
672 }
673
674 /*
675 * Write an EOL code to the output stream. The zero-fill
676 * logic for byte-aligning encoded scanlines is handled
677 * here. We also handle writing the tag bit for the next
678 * scanline when doing 2d encoding.
679 */
680 static void
681 Fax3PutEOL(TIFF* tif)
682 {
683 Fax3CodecState* sp = EncoderState(tif);
684 unsigned int bit = sp->bit;
685 int data = sp->data;
686 unsigned int code, length, tparm;
687
688 if (sp->b.groupoptions & GROUP3OPT_FILLBITS) {
689 /*
690 * Force bit alignment so EOL will terminate on
691 * a byte boundary. That is, force the bit alignment
692 * to 16-12 = 4 before putting out the EOL code.
693 */
694 int align = 8 - 4;
695 if (align != sp->bit) {
696 if (align > sp->bit)
697 align = sp->bit + (8 - align);
698 else
699 align = sp->bit - align;
700 code = 0;
701 tparm=align;
702 _PutBits(tif, 0, tparm);
703 }
704 }
705 code = EOL, length = 12;
706 if (is2DEncoding(sp))
707 code = (code<<1) | (sp->tag == G3_1D), length++;
708 _PutBits(tif, code, length);
709
710 sp->data = data;
711 sp->bit = bit;
712 }
713
714 /*
715 * Reset encoding state at the start of a strip.
716 */
717 static int
718 Fax3PreEncode(TIFF* tif, uint16 s)
719 {
720 Fax3CodecState* sp = EncoderState(tif);
721
722 (void) s;
723 assert(sp != NULL);
724 sp->bit = 8;
725 sp->data = 0;
726 sp->tag = G3_1D;
727 /*
728 * This is necessary for Group 4; otherwise it isn't
729 * needed because the first scanline of each strip ends
730 * up being copied into the refline.
731 */
732 if (sp->refline)
733 _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
734 if (is2DEncoding(sp)) {
735 float res = tif->tif_dir.td_yresolution;
736 /*
737 * The CCITT spec says that when doing 2d encoding, you
738 * should only do it on K consecutive scanlines, where K
739 * depends on the resolution of the image being encoded
740 * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
741 * code initializes td_yresolution to 0, this code will
742 * select a K of 2 unless the YResolution tag is set
743 * appropriately. (Note also that we fudge a little here
744 * and use 150 lpi to avoid problems with units conversion.)
745 */
746 if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
747 res *= 2.54f; /* convert to inches */
748 sp->maxk = (res > 150 ? 4 : 2);
749 sp->k = sp->maxk-1;
750 } else
751 sp->k = sp->maxk = 0;
752 sp->line = 0;
753 return (1);
754 }
755
756 static const unsigned char zeroruns[256] = {
757 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
758 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
759 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
760 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
761 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
762 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
763 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
764 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
765 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
766 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
767 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
768 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
769 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
770 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
771 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
772 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
773 };
774 static const unsigned char oneruns[256] = {
775 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
776 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
777 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
778 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
779 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
780 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
781 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
782 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
783 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
784 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
785 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
786 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
787 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
788 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
789 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
790 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
791 };
792
793 /*
794 * On certain systems it pays to inline
795 * the routines that find pixel spans.
796 */
797 #ifdef VAXC
798 static int32 find0span(unsigned char*, int32, int32);
799 static int32 find1span(unsigned char*, int32, int32);
800 #pragma inline(find0span,find1span)
801 #endif
802
803 /*
804 * Find a span of ones or zeros using the supplied
805 * table. The ``base'' of the bit string is supplied
806 * along with the start+end bit indices.
807 */
808 inline static int32
809 find0span(unsigned char* bp, int32 bs, int32 be)
810 {
811 int32 bits = be - bs;
812 int32 n, span;
813
814 bp += bs>>3;
815 /*
816 * Check partial byte on lhs.
817 */
818 if (bits > 0 && (n = (bs & 7))) {
819 span = zeroruns[(*bp << n) & 0xff];
820 if (span > 8-n) /* table value too generous */
821 span = 8-n;
822 if (span > bits) /* constrain span to bit range */
823 span = bits;
824 if (n+span < 8) /* doesn't extend to edge of byte */
825 return (span);
826 bits -= span;
827 bp++;
828 } else
829 span = 0;
830 if (bits >= (int32)(2 * 8 * sizeof(long))) {
831 long* lp;
832 /*
833 * Align to longword boundary and check longwords.
834 */
835 while (!isAligned(bp, long)) {
836 if (*bp != 0x00)
837 return (span + zeroruns[*bp]);
838 span += 8, bits -= 8;
839 bp++;
840 }
841 lp = (long*) bp;
842 while ((bits >= (int32)(8 * sizeof(long))) && (0 == *lp)) {
843 span += 8*sizeof (long), bits -= 8*sizeof (long);
844 lp++;
845 }
846 bp = (unsigned char*) lp;
847 }
848 /*
849 * Scan full bytes for all 0's.
850 */
851 while (bits >= 8) {
852 if (*bp != 0x00) /* end of run */
853 return (span + zeroruns[*bp]);
854 span += 8, bits -= 8;
855 bp++;
856 }
857 /*
858 * Check partial byte on rhs.
859 */
860 if (bits > 0) {
861 n = zeroruns[*bp];
862 span += (n > bits ? bits : n);
863 }
864 return (span);
865 }
866
867 inline static int32
868 find1span(unsigned char* bp, int32 bs, int32 be)
869 {
870 int32 bits = be - bs;
871 int32 n, span;
872
873 bp += bs>>3;
874 /*
875 * Check partial byte on lhs.
876 */
877 if (bits > 0 && (n = (bs & 7))) {
878 span = oneruns[(*bp << n) & 0xff];
879 if (span > 8-n) /* table value too generous */
880 span = 8-n;
881 if (span > bits) /* constrain span to bit range */
882 span = bits;
883 if (n+span < 8) /* doesn't extend to edge of byte */
884 return (span);
885 bits -= span;
886 bp++;
887 } else
888 span = 0;
889 if (bits >= (int32)(2 * 8 * sizeof(long))) {
890 long* lp;
891 /*
892 * Align to longword boundary and check longwords.
893 */
894 while (!isAligned(bp, long)) {
895 if (*bp != 0xff)
896 return (span + oneruns[*bp]);
897 span += 8, bits -= 8;
898 bp++;
899 }
900 lp = (long*) bp;
901 while ((bits >= (int32)(8 * sizeof(long))) && (~0 == *lp)) {
902 span += 8*sizeof (long), bits -= 8*sizeof (long);
903 lp++;
904 }
905 bp = (unsigned char*) lp;
906 }
907 /*
908 * Scan full bytes for all 1's.
909 */
910 while (bits >= 8) {
911 if (*bp != 0xff) /* end of run */
912 return (span + oneruns[*bp]);
913 span += 8, bits -= 8;
914 bp++;
915 }
916 /*
917 * Check partial byte on rhs.
918 */
919 if (bits > 0) {
920 n = oneruns[*bp];
921 span += (n > bits ? bits : n);
922 }
923 return (span);
924 }
925
926 /*
927 * Return the offset of the next bit in the range
928 * [bs..be] that is different from the specified
929 * color. The end, be, is returned if no such bit
930 * exists.
931 */
932 #define finddiff(_cp, _bs, _be, _color) \
933 (_bs + (_color ? find1span(_cp,_bs,_be) : find0span(_cp,_bs,_be)))
934 /*
935 * Like finddiff, but also check the starting bit
936 * against the end in case start > end.
937 */
938 #define finddiff2(_cp, _bs, _be, _color) \
939 (_bs < _be ? finddiff(_cp,_bs,_be,_color) : _be)
940
941 /*
942 * 1d-encode a row of pixels. The encoding is
943 * a sequence of all-white or all-black spans
944 * of pixels encoded with Huffman codes.
945 */
946 static int
947 Fax3Encode1DRow(TIFF* tif, unsigned char* bp, uint32 bits)
948 {
949 Fax3CodecState* sp = EncoderState(tif);
950 int32 span;
951 uint32 bs = 0;
952
953 for (;;) {
954 span = find0span(bp, bs, bits); /* white span */
955 putspan(tif, span, TIFFFaxWhiteCodes);
956 bs += span;
957 if (bs >= bits)
958 break;
959 span = find1span(bp, bs, bits); /* black span */
960 putspan(tif, span, TIFFFaxBlackCodes);
961 bs += span;
962 if (bs >= bits)
963 break;
964 }
965 if (sp->b.mode & (FAXMODE_BYTEALIGN|FAXMODE_WORDALIGN)) {
966 if (sp->bit != 8) /* byte-align */
967 Fax3FlushBits(tif, sp);
968 if ((sp->b.mode&FAXMODE_WORDALIGN) &&
969 !isAligned(tif->tif_rawcp, uint16))
970 Fax3FlushBits(tif, sp);
971 }
972 return (1);
973 }
974
975 static const tableentry horizcode =
976 { 3, 0x1, 0 }; /* 001 */
977 static const tableentry passcode =
978 { 4, 0x1, 0 }; /* 0001 */
979 static const tableentry vcodes[7] = {
980 { 7, 0x03, 0 }, /* 0000 011 */
981 { 6, 0x03, 0 }, /* 0000 11 */
982 { 3, 0x03, 0 }, /* 011 */
983 { 1, 0x1, 0 }, /* 1 */
984 { 3, 0x2, 0 }, /* 010 */
985 { 6, 0x02, 0 }, /* 0000 10 */
986 { 7, 0x02, 0 } /* 0000 010 */
987 };
988
989 /*
990 * 2d-encode a row of pixels. Consult the CCITT
991 * documentation for the algorithm.
992 */
993 static int
994 Fax3Encode2DRow(TIFF* tif, unsigned char* bp, unsigned char* rp, uint32 bits)
995 {
996 #define PIXEL(buf,ix) ((((buf)[(ix)>>3]) >> (7-((ix)&7))) & 1)
997 uint32 a0 = 0;
998 uint32 a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0));
999 uint32 b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0));
1000 uint32 a2, b2;
1001
1002 for (;;) {
1003 b2 = finddiff2(rp, b1, bits, PIXEL(rp,b1));
1004 if (b2 >= a1) {
1005 int32 d = b1 - a1;
1006 if (!(-3 <= d && d <= 3)) { /* horizontal mode */
1007 a2 = finddiff2(bp, a1, bits, PIXEL(bp,a1));
1008 putcode(tif, &horizcode);
1009 if (a0+a1 == 0 || PIXEL(bp, a0) == 0) {
1010 putspan(tif, a1-a0, TIFFFaxWhiteCodes);
1011 putspan(tif, a2-a1, TIFFFaxBlackCodes);
1012 } else {
1013 putspan(tif, a1-a0, TIFFFaxBlackCodes);
1014 putspan(tif, a2-a1, TIFFFaxWhiteCodes);
1015 }
1016 a0 = a2;
1017 } else { /* vertical mode */
1018 putcode(tif, &vcodes[d+3]);
1019 a0 = a1;
1020 }
1021 } else { /* pass mode */
1022 putcode(tif, &passcode);
1023 a0 = b2;
1024 }
1025 if (a0 >= bits)
1026 break;
1027 a1 = finddiff(bp, a0, bits, PIXEL(bp,a0));
1028 b1 = finddiff(rp, a0, bits, !PIXEL(bp,a0));
1029 b1 = finddiff(rp, b1, bits, PIXEL(bp,a0));
1030 }
1031 return (1);
1032 #undef PIXEL
1033 }
1034
1035 /*
1036 * Encode a buffer of pixels.
1037 */
1038 static int
1039 Fax3Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
1040 {
1041 static const char module[] = "Fax3Encode";
1042 Fax3CodecState* sp = EncoderState(tif);
1043 (void) s;
1044 if (cc % sp->b.rowbytes)
1045 {
1046 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be written");
1047 return (0);
1048 }
1049 while (cc > 0) {
1050 if ((sp->b.mode & FAXMODE_NOEOL) == 0)
1051 Fax3PutEOL(tif);
1052 if (is2DEncoding(sp)) {
1053 if (sp->tag == G3_1D) {
1054 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1055 return (0);
1056 sp->tag = G3_2D;
1057 } else {
1058 if (!Fax3Encode2DRow(tif, bp, sp->refline,
1059 sp->b.rowpixels))
1060 return (0);
1061 sp->k--;
1062 }
1063 if (sp->k == 0) {
1064 sp->tag = G3_1D;
1065 sp->k = sp->maxk-1;
1066 } else
1067 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1068 } else {
1069 if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1070 return (0);
1071 }
1072 bp += sp->b.rowbytes;
1073 cc -= sp->b.rowbytes;
1074 }
1075 return (1);
1076 }
1077
1078 static int
1079 Fax3PostEncode(TIFF* tif)
1080 {
1081 Fax3CodecState* sp = EncoderState(tif);
1082
1083 if (sp->bit != 8)
1084 Fax3FlushBits(tif, sp);
1085 return (1);
1086 }
1087
1088 static void
1089 Fax3Close(TIFF* tif)
1090 {
1091 if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0) {
1092 Fax3CodecState* sp = EncoderState(tif);
1093 unsigned int code = EOL;
1094 unsigned int length = 12;
1095 int i;
1096
1097 if (is2DEncoding(sp))
1098 code = (code<<1) | (sp->tag == G3_1D), length++;
1099 for (i = 0; i < 6; i++)
1100 Fax3PutBits(tif, code, length);
1101 Fax3FlushBits(tif, sp);
1102 }
1103 }
1104
1105 static void
1106 Fax3Cleanup(TIFF* tif)
1107 {
1108 Fax3CodecState* sp = DecoderState(tif);
1109
1110 assert(sp != 0);
1111
1112 tif->tif_tagmethods.vgetfield = sp->b.vgetparent;
1113 tif->tif_tagmethods.vsetfield = sp->b.vsetparent;
1114 tif->tif_tagmethods.printdir = sp->b.printdir;
1115
1116 if (sp->runs)
1117 _TIFFfree(sp->runs);
1118 if (sp->refline)
1119 _TIFFfree(sp->refline);
1120
1121 _TIFFfree(tif->tif_data);
1122 tif->tif_data = NULL;
1123
1124 _TIFFSetDefaultCompressionState(tif);
1125 }
1126
1127 #define FIELD_BADFAXLINES (FIELD_CODEC+0)
1128 #define FIELD_CLEANFAXDATA (FIELD_CODEC+1)
1129 #define FIELD_BADFAXRUN (FIELD_CODEC+2)
1130
1131 #define FIELD_OPTIONS (FIELD_CODEC+7)
1132
1133 static const TIFFField faxFields[] = {
1134 { TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, FALSE, FALSE, "FaxMode", NULL },
1135 { TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_OTHER, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, FALSE, FALSE, "FaxFillFunc", NULL },
1136 { TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_UINT32, FIELD_BADFAXLINES, TRUE, FALSE, "BadFaxLines", NULL },
1137 { TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16, TIFF_SETGET_UINT16, FIELD_CLEANFAXDATA, TRUE, FALSE, "CleanFaxData", NULL },
1138 { TIFFTAG_CONSECUTIVEBADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_UINT32, FIELD_BADFAXRUN, TRUE, FALSE, "ConsecutiveBadFaxLines", NULL }};
1139 static const TIFFField fax3Fields[] = {
1140 { TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group3Options", NULL },
1141 };
1142 static const TIFFField fax4Fields[] = {
1143 { TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32, TIFF_SETGET_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group4Options", NULL },
1144 };
1145
1146 static int
1147 Fax3VSetField(TIFF* tif, uint32 tag, va_list ap)
1148 {
1149 Fax3BaseState* sp = Fax3State(tif);
1150 const TIFFField* fip;
1151
1152 assert(sp != 0);
1153 assert(sp->vsetparent != 0);
1154
1155 switch (tag) {
1156 case TIFFTAG_FAXMODE:
1157 sp->mode = (int) va_arg(ap, int);
1158 return 1; /* NB: pseudo tag */
1159 case TIFFTAG_FAXFILLFUNC:
1160 DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc);
1161 return 1; /* NB: pseudo tag */
1162 case TIFFTAG_GROUP3OPTIONS:
1163 /* XXX: avoid reading options if compression mismatches. */
1164 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3)
1165 sp->groupoptions = (uint32) va_arg(ap, uint32);
1166 break;
1167 case TIFFTAG_GROUP4OPTIONS:
1168 /* XXX: avoid reading options if compression mismatches. */
1169 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1170 sp->groupoptions = (uint32) va_arg(ap, uint32);
1171 break;
1172 case TIFFTAG_BADFAXLINES:
1173 sp->badfaxlines = (uint32) va_arg(ap, uint32);
1174 break;
1175 case TIFFTAG_CLEANFAXDATA:
1176 sp->cleanfaxdata = (uint16) va_arg(ap, uint16_vap);
1177 break;
1178 case TIFFTAG_CONSECUTIVEBADFAXLINES:
1179 sp->badfaxrun = (uint32) va_arg(ap, uint32);
1180 break;
1181 default:
1182 return (*sp->vsetparent)(tif, tag, ap);
1183 }
1184
1185 if ((fip = TIFFFieldWithTag(tif, tag)))
1186 TIFFSetFieldBit(tif, fip->field_bit);
1187 else
1188 return 0;
1189
1190 tif->tif_flags |= TIFF_DIRTYDIRECT;
1191 return 1;
1192 }
1193
1194 static int
1195 Fax3VGetField(TIFF* tif, uint32 tag, va_list ap)
1196 {
1197 Fax3BaseState* sp = Fax3State(tif);
1198
1199 assert(sp != 0);
1200
1201 switch (tag) {
1202 case TIFFTAG_FAXMODE:
1203 *va_arg(ap, int*) = sp->mode;
1204 break;
1205 case TIFFTAG_FAXFILLFUNC:
1206 *va_arg(ap, TIFFFaxFillFunc*) = DecoderState(tif)->fill;
1207 break;
1208 case TIFFTAG_GROUP3OPTIONS:
1209 case TIFFTAG_GROUP4OPTIONS:
1210 *va_arg(ap, uint32*) = sp->groupoptions;
1211 break;
1212 case TIFFTAG_BADFAXLINES:
1213 *va_arg(ap, uint32*) = sp->badfaxlines;
1214 break;
1215 case TIFFTAG_CLEANFAXDATA:
1216 *va_arg(ap, uint16*) = sp->cleanfaxdata;
1217 break;
1218 case TIFFTAG_CONSECUTIVEBADFAXLINES:
1219 *va_arg(ap, uint32*) = sp->badfaxrun;
1220 break;
1221 default:
1222 return (*sp->vgetparent)(tif, tag, ap);
1223 }
1224 return (1);
1225 }
1226
1227 static void
1228 Fax3PrintDir(TIFF* tif, FILE* fd, long flags)
1229 {
1230 Fax3BaseState* sp = Fax3State(tif);
1231
1232 assert(sp != 0);
1233
1234 (void) flags;
1235 if (TIFFFieldSet(tif,FIELD_OPTIONS)) {
1236 const char* sep = " ";
1237 if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4) {
1238 fprintf(fd, " Group 4 Options:");
1239 if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED)
1240 fprintf(fd, "%suncompressed data", sep);
1241 } else {
1242
1243 fprintf(fd, " Group 3 Options:");
1244 if (sp->groupoptions & GROUP3OPT_2DENCODING)
1245 fprintf(fd, "%s2-d encoding", sep), sep = "+";
1246 if (sp->groupoptions & GROUP3OPT_FILLBITS)
1247 fprintf(fd, "%sEOL padding", sep), sep = "+";
1248 if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED)
1249 fprintf(fd, "%suncompressed data", sep);
1250 }
1251 fprintf(fd, " (%lu = 0x%lx)\n",
1252 (unsigned long) sp->groupoptions,
1253 (unsigned long) sp->groupoptions);
1254 }
1255 if (TIFFFieldSet(tif,FIELD_CLEANFAXDATA)) {
1256 fprintf(fd, " Fax Data:");
1257 switch (sp->cleanfaxdata) {
1258 case CLEANFAXDATA_CLEAN:
1259 fprintf(fd, " clean");
1260 break;
1261 case CLEANFAXDATA_REGENERATED:
1262 fprintf(fd, " receiver regenerated");
1263 break;
1264 case CLEANFAXDATA_UNCLEAN:
1265 fprintf(fd, " uncorrected errors");
1266 break;
1267 }
1268 fprintf(fd, " (%u = 0x%x)\n",
1269 sp->cleanfaxdata, sp->cleanfaxdata);
1270 }
1271 if (TIFFFieldSet(tif,FIELD_BADFAXLINES))
1272 fprintf(fd, " Bad Fax Lines: %lu\n",
1273 (unsigned long) sp->badfaxlines);
1274 if (TIFFFieldSet(tif,FIELD_BADFAXRUN))
1275 fprintf(fd, " Consecutive Bad Fax Lines: %lu\n",
1276 (unsigned long) sp->badfaxrun);
1277 if (sp->printdir)
1278 (*sp->printdir)(tif, fd, flags);
1279 }
1280
1281 static int
1282 InitCCITTFax3(TIFF* tif)
1283 {
1284 static const char module[] = "InitCCITTFax3";
1285 Fax3BaseState* sp;
1286
1287 /*
1288 * Merge codec-specific tag information.
1289 */
1290 if (!_TIFFMergeFields(tif, faxFields, TIFFArrayCount(faxFields))) {
1291 TIFFErrorExt(tif->tif_clientdata, "InitCCITTFax3",
1292 "Merging common CCITT Fax codec-specific tags failed");
1293 return 0;
1294 }
1295
1296 /*
1297 * Allocate state block so tag methods have storage to record values.
1298 */
1299 tif->tif_data = (uint8*)
1300 _TIFFmalloc(sizeof (Fax3CodecState));
1301
1302 if (tif->tif_data == NULL) {
1303 TIFFErrorExt(tif->tif_clientdata, module,
1304 "No space for state block");
1305 return (0);
1306 }
1307
1308 sp = Fax3State(tif);
1309 sp->rw_mode = tif->tif_mode;
1310
1311 /*
1312 * Override parent get/set field methods.
1313 */
1314 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1315 tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */
1316 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1317 tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */
1318 sp->printdir = tif->tif_tagmethods.printdir;
1319 tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */
1320 sp->groupoptions = 0;
1321
1322 if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */
1323 tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */
1324 DecoderState(tif)->runs = NULL;
1325 TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns);
1326 EncoderState(tif)->refline = NULL;
1327
1328 /*
1329 * Install codec methods.
1330 */
1331 tif->tif_fixuptags = Fax3FixupTags;
1332 tif->tif_setupdecode = Fax3SetupState;
1333 tif->tif_predecode = Fax3PreDecode;
1334 tif->tif_decoderow = Fax3Decode1D;
1335 tif->tif_decodestrip = Fax3Decode1D;
1336 tif->tif_decodetile = Fax3Decode1D;
1337 tif->tif_setupencode = Fax3SetupState;
1338 tif->tif_preencode = Fax3PreEncode;
1339 tif->tif_postencode = Fax3PostEncode;
1340 tif->tif_encoderow = Fax3Encode;
1341 tif->tif_encodestrip = Fax3Encode;
1342 tif->tif_encodetile = Fax3Encode;
1343 tif->tif_close = Fax3Close;
1344 tif->tif_cleanup = Fax3Cleanup;
1345
1346 return (1);
1347 }
1348
1349 int
1350 TIFFInitCCITTFax3(TIFF* tif, int scheme)
1351 {
1352 (void) scheme;
1353 if (InitCCITTFax3(tif)) {
1354 /*
1355 * Merge codec-specific tag information.
1356 */
1357 if (!_TIFFMergeFields(tif, fax3Fields,
1358 TIFFArrayCount(fax3Fields))) {
1359 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax3",
1360 "Merging CCITT Fax 3 codec-specific tags failed");
1361 return 0;
1362 }
1363
1364 /*
1365 * The default format is Class/F-style w/o RTC.
1366 */
1367 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
1368 } else
1369 return 01;
1370 }
1371
1372 /*
1373 * CCITT Group 4 (T.6) Facsimile-compatible
1374 * Compression Scheme Support.
1375 */
1376
1377 #define SWAP(t,a,b) { t x; x = (a); (a) = (b); (b) = x; }
1378 /*
1379 * Decode the requested amount of G4-encoded data.
1380 */
1381 static int
1382 Fax4Decode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
1383 {
1384 DECLARE_STATE_2D(tif, sp, "Fax4Decode");
1385 (void) s;
1386 if (occ % sp->b.rowbytes)
1387 {
1388 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read");
1389 return (-1);
1390 }
1391 CACHE_STATE(tif, sp);
1392 while (occ > 0) {
1393 a0 = 0;
1394 RunLength = 0;
1395 pa = thisrun = sp->curruns;
1396 pb = sp->refruns;
1397 b1 = *pb++;
1398 #ifdef FAX3_DEBUG
1399 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1400 printf("-------------------- %d\n", tif->tif_row);
1401 fflush(stdout);
1402 #endif
1403 EXPAND2D(EOFG4);
1404 if (EOLcnt)
1405 goto EOFG4;
1406 (*sp->fill)(buf, thisrun, pa, lastx);
1407 SETVALUE(0); /* imaginary change for reference */
1408 SWAP(uint32*, sp->curruns, sp->refruns);
1409 buf += sp->b.rowbytes;
1410 occ -= sp->b.rowbytes;
1411 sp->line++;
1412 continue;
1413 EOFG4:
1414 NeedBits16( 13, BADG4 );
1415 BADG4:
1416 #ifdef FAX3_DEBUG
1417 if( GetBits(13) != 0x1001 )
1418 fputs( "Bad EOFB\n", stderr );
1419 #endif
1420 ClrBits( 13 );
1421 (*sp->fill)(buf, thisrun, pa, lastx);
1422 UNCACHE_STATE(tif, sp);
1423 return ( sp->line ? 1 : -1); /* don't error on badly-terminated strips */
1424 }
1425 UNCACHE_STATE(tif, sp);
1426 return (1);
1427 }
1428 #undef SWAP
1429
1430 /*
1431 * Encode the requested amount of data.
1432 */
1433 static int
1434 Fax4Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
1435 {
1436 static const char module[] = "Fax4Encode";
1437 Fax3CodecState *sp = EncoderState(tif);
1438 (void) s;
1439 if (cc % sp->b.rowbytes)
1440 {
1441 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be written");
1442 return (0);
1443 }
1444 while (cc > 0) {
1445 if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1446 return (0);
1447 _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1448 bp += sp->b.rowbytes;
1449 cc -= sp->b.rowbytes;
1450 }
1451 return (1);
1452 }
1453
1454 static int
1455 Fax4PostEncode(TIFF* tif)
1456 {
1457 Fax3CodecState *sp = EncoderState(tif);
1458
1459 /* terminate strip w/ EOFB */
1460 Fax3PutBits(tif, EOL, 12);
1461 Fax3PutBits(tif, EOL, 12);
1462 if (sp->bit != 8)
1463 Fax3FlushBits(tif, sp);
1464 return (1);
1465 }
1466
1467 int
1468 TIFFInitCCITTFax4(TIFF* tif, int scheme)
1469 {
1470 (void) scheme;
1471 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1472 /*
1473 * Merge codec-specific tag information.
1474 */
1475 if (!_TIFFMergeFields(tif, fax4Fields,
1476 TIFFArrayCount(fax4Fields))) {
1477 TIFFErrorExt(tif->tif_clientdata, "TIFFInitCCITTFax4",
1478 "Merging CCITT Fax 4 codec-specific tags failed");
1479 return 0;
1480 }
1481
1482 tif->tif_decoderow = Fax4Decode;
1483 tif->tif_decodestrip = Fax4Decode;
1484 tif->tif_decodetile = Fax4Decode;
1485 tif->tif_encoderow = Fax4Encode;
1486 tif->tif_encodestrip = Fax4Encode;
1487 tif->tif_encodetile = Fax4Encode;
1488 tif->tif_postencode = Fax4PostEncode;
1489 /*
1490 * Suppress RTC at the end of each strip.
1491 */
1492 return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC);
1493 } else
1494 return (0);
1495 }
1496
1497 /*
1498 * CCITT Group 3 1-D Modified Huffman RLE Compression Support.
1499 * (Compression algorithms 2 and 32771)
1500 */
1501
1502 /*
1503 * Decode the requested amount of RLE-encoded data.
1504 */
1505 static int
1506 Fax3DecodeRLE(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
1507 {
1508 DECLARE_STATE(tif, sp, "Fax3DecodeRLE");
1509 int mode = sp->b.mode;
1510 (void) s;
1511 if (occ % sp->b.rowbytes)
1512 {
1513 TIFFErrorExt(tif->tif_clientdata, module, "Fractional scanlines cannot be read");
1514 return (-1);
1515 }
1516 CACHE_STATE(tif, sp);
1517 thisrun = sp->curruns;
1518 while (occ > 0) {
1519 a0 = 0;
1520 RunLength = 0;
1521 pa = thisrun;
1522 #ifdef FAX3_DEBUG
1523 printf("\nBitAcc=%08X, BitsAvail = %d\n", BitAcc, BitsAvail);
1524 printf("-------------------- %d\n", tif->tif_row);
1525 fflush(stdout);
1526 #endif
1527 EXPAND1D(EOFRLE);
1528 (*sp->fill)(buf, thisrun, pa, lastx);
1529 /*
1530 * Cleanup at the end of the row.
1531 */
1532 if (mode & FAXMODE_BYTEALIGN) {
1533 int n = BitsAvail - (BitsAvail &~ 7);
1534 ClrBits(n);
1535 } else if (mode & FAXMODE_WORDALIGN) {
1536 int n = BitsAvail - (BitsAvail &~ 15);
1537 ClrBits(n);
1538 if (BitsAvail == 0 && !isAligned(cp, uint16))
1539 cp++;
1540 }
1541 buf += sp->b.rowbytes;
1542 occ -= sp->b.rowbytes;
1543 sp->line++;
1544 continue;
1545 EOFRLE: /* premature EOF */
1546 (*sp->fill)(buf, thisrun, pa, lastx);
1547 UNCACHE_STATE(tif, sp);
1548 return (-1);
1549 }
1550 UNCACHE_STATE(tif, sp);
1551 return (1);
1552 }
1553
1554 int
1555 TIFFInitCCITTRLE(TIFF* tif, int scheme)
1556 {
1557 (void) scheme;
1558 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1559 tif->tif_decoderow = Fax3DecodeRLE;
1560 tif->tif_decodestrip = Fax3DecodeRLE;
1561 tif->tif_decodetile = Fax3DecodeRLE;
1562 /*
1563 * Suppress RTC+EOLs when encoding and byte-align data.
1564 */
1565 return TIFFSetField(tif, TIFFTAG_FAXMODE,
1566 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_BYTEALIGN);
1567 } else
1568 return (0);
1569 }
1570
1571 int
1572 TIFFInitCCITTRLEW(TIFF* tif, int scheme)
1573 {
1574 (void) scheme;
1575 if (InitCCITTFax3(tif)) { /* reuse G3 support */
1576 tif->tif_decoderow = Fax3DecodeRLE;
1577 tif->tif_decodestrip = Fax3DecodeRLE;
1578 tif->tif_decodetile = Fax3DecodeRLE;
1579 /*
1580 * Suppress RTC+EOLs when encoding and word-align data.
1581 */
1582 return TIFFSetField(tif, TIFFTAG_FAXMODE,
1583 FAXMODE_NORTC|FAXMODE_NOEOL|FAXMODE_WORDALIGN);
1584 } else
1585 return (0);
1586 }
1587 #endif /* CCITT_SUPPORT */
1588
1589 /* vim: set ts=8 sts=8 sw=8 noet: */
1590 /*
1591 * Local Variables:
1592 * mode: c
1593 * c-basic-offset: 8
1594 * fill-column: 78
1595 * End:
1596 */
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