Line data Source code
1 : /*
2 : * Copyright (c) 1990-1997 Sam Leffler
3 : * Copyright (c) 1991-1997 Silicon Graphics, Inc.
4 : *
5 : * Permission to use, copy, modify, distribute, and sell this software and
6 : * its documentation for any purpose is hereby granted without fee, provided
7 : * that (i) the above copyright notices and this permission notice appear in
8 : * all copies of the software and related documentation, and (ii) the names of
9 : * Sam Leffler and Silicon Graphics may not be used in any advertising or
10 : * publicity relating to the software without the specific, prior written
11 : * permission of Sam Leffler and Silicon Graphics.
12 : *
13 : * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14 : * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 : * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16 : *
17 : * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
18 : * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 : * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 : * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 : * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22 : * OF THIS SOFTWARE.
23 : */
24 :
25 : #include "tiffiop.h"
26 : #ifdef CCITT_SUPPORT
27 : /*
28 : * TIFF Library.
29 : *
30 : * CCITT Group 3 (T.4) and Group 4 (T.6) Compression Support.
31 : *
32 : * This file contains support for decoding and encoding TIFF
33 : * compression algorithms 2, 3, 4, and 32771.
34 : *
35 : * Decoder support is derived, with permission, from the code
36 : * in Frank Cringle's viewfax program;
37 : * Copyright (C) 1990, 1995 Frank D. Cringle.
38 : */
39 : #include "tif_fax3.h"
40 : #define G3CODES
41 : #include "t4.h"
42 : #include <stdio.h>
43 :
44 : #ifndef EOF_REACHED_COUNT_THRESHOLD
45 : /* Arbitrary threshold to avoid corrupted single-strip files with extremely
46 : * large imageheight to cause apparently endless looping, such as in
47 : * https://gitlab.com/libtiff/libtiff/-/issues/583
48 : */
49 : #define EOF_REACHED_COUNT_THRESHOLD 8192
50 : #endif
51 :
52 : /*
53 : * Compression+decompression state blocks are
54 : * derived from this ``base state'' block.
55 : */
56 : typedef struct
57 : {
58 : int rw_mode; /* O_RDONLY for decode, else encode */
59 : int mode; /* operating mode */
60 : tmsize_t rowbytes; /* bytes in a decoded scanline */
61 : uint32_t rowpixels; /* pixels in a scanline */
62 :
63 : uint16_t cleanfaxdata; /* CleanFaxData tag */
64 : uint32_t badfaxrun; /* BadFaxRun tag */
65 : uint32_t badfaxlines; /* BadFaxLines tag */
66 : uint32_t groupoptions; /* Group 3/4 options tag */
67 :
68 : TIFFVGetMethod vgetparent; /* super-class method */
69 : TIFFVSetMethod vsetparent; /* super-class method */
70 : TIFFPrintMethod printdir; /* super-class method */
71 : } Fax3BaseState;
72 : #define Fax3State(tif) ((Fax3BaseState *)(tif)->tif_data)
73 :
74 : typedef enum
75 : {
76 : G3_1D,
77 : G3_2D
78 : } Ttag;
79 : typedef struct
80 : {
81 : Fax3BaseState b;
82 :
83 : /* Decoder state info */
84 : const unsigned char *bitmap; /* bit reversal table */
85 : uint32_t data; /* current i/o byte/word */
86 : int bit; /* current i/o bit in byte */
87 : int EOLcnt; /* count of EOL codes recognized */
88 : int eofReachedCount; /* number of times decode has been called with
89 : EOF already reached */
90 : TIFFFaxFillFunc fill; /* fill routine */
91 : uint32_t *runs; /* b&w runs for current/previous row */
92 : uint32_t nruns; /* size of the refruns / curruns arrays */
93 : uint32_t *refruns; /* runs for reference line */
94 : uint32_t *curruns; /* runs for current line */
95 :
96 : /* Encoder state info */
97 : Ttag tag; /* encoding state */
98 : unsigned char *refline; /* reference line for 2d decoding */
99 : int k; /* #rows left that can be 2d encoded */
100 : int maxk; /* max #rows that can be 2d encoded */
101 :
102 : int line;
103 : } Fax3CodecState;
104 : #define DecoderState(tif) ((Fax3CodecState *)Fax3State(tif))
105 : #define EncoderState(tif) ((Fax3CodecState *)Fax3State(tif))
106 :
107 : #define is2DEncoding(sp) (sp->b.groupoptions & GROUP3OPT_2DENCODING)
108 : #define isAligned(p, t) ((((size_t)(p)) & (sizeof(t) - 1)) == 0)
109 :
110 : /*
111 : * Group 3 and Group 4 Decoding.
112 : */
113 :
114 : /*
115 : * These macros glue the TIFF library state to
116 : * the state expected by Frank's decoder.
117 : */
118 : #define DECLARE_STATE(tif, sp, mod) \
119 : static const char module[] = mod; \
120 : Fax3CodecState *sp = DecoderState(tif); \
121 : int a0; /* reference element */ \
122 : int lastx = sp->b.rowpixels; /* last element in row */ \
123 : uint32_t BitAcc; /* bit accumulator */ \
124 : int BitsAvail; /* # valid bits in BitAcc */ \
125 : int RunLength; /* length of current run */ \
126 : unsigned char *cp; /* next byte of input data */ \
127 : unsigned char *ep; /* end of input data */ \
128 : uint32_t *pa; /* place to stuff next run */ \
129 : uint32_t *thisrun; /* current row's run array */ \
130 : int EOLcnt; /* # EOL codes recognized */ \
131 : const unsigned char *bitmap = sp->bitmap; /* input data bit reverser */ \
132 : const TIFFFaxTabEnt *TabEnt
133 :
134 : #define DECLARE_STATE_2D(tif, sp, mod) \
135 : DECLARE_STATE(tif, sp, mod); \
136 : int b1; /* next change on prev line */ \
137 : uint32_t \
138 : *pb /* next run in reference line */ /* \
139 : * Load any state that may be \
140 : * changed during decoding. \
141 : */
142 : #define CACHE_STATE(tif, sp) \
143 : do \
144 : { \
145 : BitAcc = sp->data; \
146 : BitsAvail = sp->bit; \
147 : EOLcnt = sp->EOLcnt; \
148 : cp = (unsigned char *)tif->tif_rawcp; \
149 : ep = cp + tif->tif_rawcc; \
150 : } while (0)
151 : /*
152 : * Save state possibly changed during decoding.
153 : */
154 : #define UNCACHE_STATE(tif, sp) \
155 : do \
156 : { \
157 : sp->bit = BitsAvail; \
158 : sp->data = BitAcc; \
159 : sp->EOLcnt = EOLcnt; \
160 : tif->tif_rawcc -= (tmsize_t)((uint8_t *)cp - tif->tif_rawcp); \
161 : tif->tif_rawcp = (uint8_t *)cp; \
162 : } while (0)
163 :
164 : /*
165 : * Setup state for decoding a strip.
166 : */
167 13 : static int Fax3PreDecode(TIFF *tif, uint16_t s)
168 : {
169 13 : Fax3CodecState *sp = DecoderState(tif);
170 :
171 : (void)s;
172 13 : assert(sp != NULL);
173 13 : sp->bit = 0; /* force initial read */
174 13 : sp->data = 0;
175 13 : sp->EOLcnt = 0; /* force initial scan for EOL */
176 13 : sp->eofReachedCount = 0;
177 : /*
178 : * Decoder assumes lsb-to-msb bit order. Note that we select
179 : * this here rather than in Fax3SetupState so that viewers can
180 : * hold the image open, fiddle with the FillOrder tag value,
181 : * and then re-decode the image. Otherwise they'd need to close
182 : * and open the image to get the state reset.
183 : */
184 13 : sp->bitmap =
185 13 : TIFFGetBitRevTable(tif->tif_dir.td_fillorder != FILLORDER_LSB2MSB);
186 13 : sp->curruns = sp->runs;
187 13 : if (sp->refruns)
188 : { /* init reference line to white */
189 11 : sp->refruns = sp->runs + sp->nruns;
190 11 : sp->refruns[0] = (uint32_t)sp->b.rowpixels;
191 11 : sp->refruns[1] = 0;
192 : }
193 13 : sp->line = 0;
194 13 : return (1);
195 : }
196 :
197 : /*
198 : * Routine for handling various errors/conditions.
199 : * Note how they are "glued into the decoder" by
200 : * overriding the definitions used by the decoder.
201 : */
202 :
203 0 : static void Fax3Unexpected(const char *module, TIFF *tif, uint32_t line,
204 : uint32_t a0)
205 : {
206 0 : TIFFErrorExtR(tif, module,
207 : "Bad code word at line %" PRIu32 " of %s %" PRIu32
208 : " (x %" PRIu32 ")",
209 0 : line, isTiled(tif) ? "tile" : "strip",
210 0 : (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), a0);
211 0 : }
212 : #define unexpected(table, a0) Fax3Unexpected(module, tif, sp->line, a0)
213 :
214 0 : static void Fax3Extension(const char *module, TIFF *tif, uint32_t line,
215 : uint32_t a0)
216 : {
217 0 : TIFFErrorExtR(tif, module,
218 : "Uncompressed data (not supported) at line %" PRIu32
219 : " of %s %" PRIu32 " (x %" PRIu32 ")",
220 0 : line, isTiled(tif) ? "tile" : "strip",
221 0 : (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), a0);
222 0 : }
223 : #define extension(a0) Fax3Extension(module, tif, sp->line, a0)
224 :
225 0 : static void Fax3BadLength(const char *module, TIFF *tif, uint32_t line,
226 : uint32_t a0, uint32_t lastx)
227 : {
228 0 : TIFFWarningExtR(tif, module,
229 : "%s at line %" PRIu32 " of %s %" PRIu32 " (got %" PRIu32
230 : ", expected %" PRIu32 ")",
231 : a0 < lastx ? "Premature EOL" : "Line length mismatch", line,
232 0 : isTiled(tif) ? "tile" : "strip",
233 0 : (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), a0,
234 : lastx);
235 0 : }
236 : #define badlength(a0, lastx) Fax3BadLength(module, tif, sp->line, a0, lastx)
237 :
238 0 : static void Fax3PrematureEOF(const char *module, TIFF *tif, uint32_t line,
239 : uint32_t a0)
240 : {
241 0 : TIFFWarningExtR(tif, module,
242 : "Premature EOF at line %" PRIu32 " of %s %" PRIu32
243 : " (x %" PRIu32 ")",
244 0 : line, isTiled(tif) ? "tile" : "strip",
245 0 : (isTiled(tif) ? tif->tif_curtile : tif->tif_curstrip), a0);
246 0 : }
247 : #define prematureEOF(a0) \
248 : do \
249 : { \
250 : Fax3PrematureEOF(module, tif, sp->line, a0); \
251 : ++sp->eofReachedCount; \
252 : } while (0)
253 :
254 : #define Nop
255 :
256 : /**
257 : * Decode the requested amount of G3 1D-encoded data.
258 : * @param buf destination buffer
259 : * @param occ available bytes in destination buffer
260 : * @param s number of planes (ignored)
261 : * @returns 1 for success, -1 in case of error
262 : */
263 1 : static int Fax3Decode1D(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s)
264 : {
265 1 : DECLARE_STATE(tif, sp, "Fax3Decode1D");
266 : (void)s;
267 1 : if (occ % sp->b.rowbytes)
268 : {
269 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read");
270 0 : return (-1);
271 : }
272 1 : if (sp->eofReachedCount >= EOF_REACHED_COUNT_THRESHOLD)
273 : {
274 0 : TIFFErrorExtR(
275 : tif, module,
276 : "End of file has already been reached %d times within that strip",
277 : sp->eofReachedCount);
278 0 : return (-1);
279 : }
280 1 : CACHE_STATE(tif, sp);
281 1 : thisrun = sp->curruns;
282 100 : while (occ > 0)
283 : {
284 99 : a0 = 0;
285 99 : RunLength = 0;
286 99 : pa = thisrun;
287 : #ifdef FAX3_DEBUG
288 : printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail);
289 : printf("-------------------- %" PRIu32 "\n", tif->tif_row);
290 : fflush(stdout);
291 : #endif
292 693 : SYNC_EOL(EOF1D);
293 1323 : EXPAND1D(EOF1Da);
294 99 : (*sp->fill)(buf, thisrun, pa, lastx);
295 99 : buf += sp->b.rowbytes;
296 99 : occ -= sp->b.rowbytes;
297 99 : sp->line++;
298 99 : continue;
299 0 : EOF1D: /* premature EOF */
300 0 : CLEANUP_RUNS();
301 0 : EOF1Da: /* premature EOF */
302 0 : (*sp->fill)(buf, thisrun, pa, lastx);
303 0 : UNCACHE_STATE(tif, sp);
304 0 : return (-1);
305 : }
306 1 : UNCACHE_STATE(tif, sp);
307 1 : return (1);
308 : }
309 :
310 : #define SWAP(t, a, b) \
311 : { \
312 : t x; \
313 : x = (a); \
314 : (a) = (b); \
315 : (b) = x; \
316 : }
317 : /*
318 : * Decode the requested amount of G3 2D-encoded data.
319 : */
320 1 : static int Fax3Decode2D(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s)
321 : {
322 1 : DECLARE_STATE_2D(tif, sp, "Fax3Decode2D");
323 : int is1D; /* current line is 1d/2d-encoded */
324 : (void)s;
325 1 : if (occ % sp->b.rowbytes)
326 : {
327 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read");
328 0 : return (-1);
329 : }
330 1 : if (sp->eofReachedCount >= EOF_REACHED_COUNT_THRESHOLD)
331 : {
332 0 : TIFFErrorExtR(
333 : tif, module,
334 : "End of file has already been reached %d times within that strip",
335 : sp->eofReachedCount);
336 0 : return (-1);
337 : }
338 1 : CACHE_STATE(tif, sp);
339 1025 : while (occ > 0)
340 : {
341 1024 : a0 = 0;
342 1024 : RunLength = 0;
343 1024 : pa = thisrun = sp->curruns;
344 : #ifdef FAX3_DEBUG
345 : printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d EOLcnt = %d", BitAcc,
346 : BitsAvail, EOLcnt);
347 : #endif
348 7168 : SYNC_EOL(EOF2D);
349 1024 : NeedBits8(1, EOF2D);
350 1024 : is1D = GetBits(1); /* 1D/2D-encoding tag bit */
351 1024 : ClrBits(1);
352 : #ifdef FAX3_DEBUG
353 : printf(" %s\n-------------------- %" PRIu32 "\n", is1D ? "1D" : "2D",
354 : tif->tif_row);
355 : fflush(stdout);
356 : #endif
357 1024 : pb = sp->refruns;
358 1024 : b1 = *pb++;
359 1024 : if (is1D)
360 737 : EXPAND1D(EOF2Da);
361 : else
362 3072 : EXPAND2D(EOF2Da);
363 1024 : (*sp->fill)(buf, thisrun, pa, lastx);
364 1024 : if (pa < thisrun + sp->nruns)
365 : {
366 1024 : SETVALUE(0); /* imaginary change for reference */
367 : }
368 1024 : SWAP(uint32_t *, sp->curruns, sp->refruns);
369 1024 : buf += sp->b.rowbytes;
370 1024 : occ -= sp->b.rowbytes;
371 1024 : sp->line++;
372 1024 : continue;
373 0 : EOF2D: /* premature EOF */
374 0 : CLEANUP_RUNS();
375 0 : EOF2Da: /* premature EOF */
376 0 : (*sp->fill)(buf, thisrun, pa, lastx);
377 0 : UNCACHE_STATE(tif, sp);
378 0 : return (-1);
379 : }
380 1 : UNCACHE_STATE(tif, sp);
381 1 : return (1);
382 : }
383 : #undef SWAP
384 :
385 : #define FILL(n, cp) \
386 : for (int32_t ifill = 0; ifill < (n); ++ifill) \
387 : { \
388 : (cp)[ifill] = 0xff; \
389 : } \
390 : (cp) += (n);
391 :
392 : #define ZERO(n, cp) \
393 : for (int32_t izero = 0; izero < (n); ++izero) \
394 : { \
395 : (cp)[izero] = 0; \
396 : } \
397 : (cp) += (n);
398 :
399 : /*
400 : * Bit-fill a row according to the white/black
401 : * runs generated during G3/G4 decoding.
402 : */
403 23917 : void _TIFFFax3fillruns(unsigned char *buf, uint32_t *runs, uint32_t *erun,
404 : uint32_t lastx)
405 : {
406 : static const unsigned char _fillmasks[] = {0x00, 0x80, 0xc0, 0xe0, 0xf0,
407 : 0xf8, 0xfc, 0xfe, 0xff};
408 : unsigned char *cp;
409 : uint32_t x, bx, run;
410 : int32_t n, nw;
411 : int64_t *lp;
412 :
413 23917 : if ((erun - runs) & 1)
414 991 : *erun++ = 0;
415 23917 : x = 0;
416 84444 : for (; runs < erun; runs += 2)
417 : {
418 60527 : run = runs[0];
419 60527 : if (x + run > lastx || run > lastx)
420 0 : run = runs[0] = (uint32_t)(lastx - x);
421 60527 : if (run)
422 : {
423 38491 : cp = buf + (x >> 3);
424 38491 : bx = x & 7;
425 38491 : if (run > 8 - bx)
426 : {
427 25749 : if (bx)
428 : { /* align to byte boundary */
429 21848 : *cp++ &= 0xff << (8 - bx);
430 21848 : run -= 8 - bx;
431 : }
432 25749 : if ((n = run >> 3) != 0)
433 : { /* multiple bytes to fill */
434 15572 : if ((n / sizeof(int64_t)) > 1)
435 : {
436 : /*
437 : * Align to int64_tword boundary and fill.
438 : */
439 2335 : for (; n && !isAligned(cp, int64_t); n--)
440 1140 : *cp++ = 0x00;
441 1195 : lp = (int64_t *)cp;
442 1195 : nw = (int32_t)(n / sizeof(int64_t));
443 1195 : n -= nw * sizeof(int64_t);
444 : do
445 : {
446 8396 : *lp++ = 0L;
447 8396 : } while (--nw);
448 1195 : cp = (unsigned char *)lp;
449 : }
450 56634 : ZERO(n, cp);
451 15572 : run &= 7;
452 : }
453 25749 : if (run)
454 23710 : cp[0] &= 0xff >> run;
455 : }
456 : else
457 12742 : cp[0] &= ~(_fillmasks[run] >> bx);
458 38491 : x += runs[0];
459 : }
460 60527 : run = runs[1];
461 60527 : if (x + run > lastx || run > lastx)
462 0 : run = runs[1] = lastx - x;
463 60527 : if (run)
464 : {
465 59536 : cp = buf + (x >> 3);
466 59536 : bx = x & 7;
467 59536 : if (run > 8 - bx)
468 : {
469 47609 : if (bx)
470 : { /* align to byte boundary */
471 23602 : *cp++ |= 0xff >> bx;
472 23602 : run -= 8 - bx;
473 : }
474 47609 : if ((n = run >> 3) != 0)
475 : { /* multiple bytes to fill */
476 41944 : if ((n / sizeof(int64_t)) > 1)
477 : {
478 : /*
479 : * Align to int64_t boundary and fill.
480 : */
481 54579 : for (; n && !isAligned(cp, int64_t); n--)
482 26493 : *cp++ = 0xff;
483 28086 : lp = (int64_t *)cp;
484 28086 : nw = (int32_t)(n / sizeof(int64_t));
485 28086 : n -= nw * sizeof(int64_t);
486 : do
487 : {
488 311441 : *lp++ = -1L;
489 311441 : } while (--nw);
490 28086 : cp = (unsigned char *)lp;
491 : }
492 226601 : FILL(n, cp);
493 41944 : run &= 7;
494 : }
495 : /* Explicit 0xff masking to make icc -check=conversions happy */
496 47609 : if (run)
497 22430 : cp[0] = (unsigned char)((cp[0] | (0xff00 >> run)) & 0xff);
498 : }
499 : else
500 11927 : cp[0] |= _fillmasks[run] >> bx;
501 59536 : x += runs[1];
502 : }
503 : }
504 23917 : assert(x == lastx);
505 23917 : }
506 : #undef ZERO
507 : #undef FILL
508 :
509 53 : static int Fax3FixupTags(TIFF *tif)
510 : {
511 : (void)tif;
512 53 : return (1);
513 : }
514 :
515 : /*
516 : * Setup G3/G4-related compression/decompression state
517 : * before data is processed. This routine is called once
518 : * per image -- it sets up different state based on whether
519 : * or not decoding or encoding is being done and whether
520 : * 1D- or 2D-encoded data is involved.
521 : */
522 22 : static int Fax3SetupState(TIFF *tif)
523 : {
524 : static const char module[] = "Fax3SetupState";
525 22 : TIFFDirectory *td = &tif->tif_dir;
526 22 : Fax3BaseState *sp = Fax3State(tif);
527 : int needsRefLine;
528 22 : Fax3CodecState *dsp = (Fax3CodecState *)Fax3State(tif);
529 : tmsize_t rowbytes;
530 : uint32_t rowpixels;
531 :
532 22 : if (td->td_bitspersample != 1)
533 : {
534 0 : TIFFErrorExtR(tif, module,
535 : "Bits/sample must be 1 for Group 3/4 encoding/decoding");
536 0 : return (0);
537 : }
538 : /*
539 : * Calculate the scanline/tile widths.
540 : */
541 22 : if (isTiled(tif))
542 : {
543 0 : rowbytes = TIFFTileRowSize(tif);
544 0 : rowpixels = td->td_tilewidth;
545 : }
546 : else
547 : {
548 22 : rowbytes = TIFFScanlineSize(tif);
549 22 : rowpixels = td->td_imagewidth;
550 : }
551 22 : if ((int64_t)rowbytes < ((int64_t)rowpixels + 7) / 8)
552 : {
553 0 : TIFFErrorExtR(tif, module,
554 : "Inconsistent number of bytes per row : rowbytes=%" PRId64
555 : " rowpixels=%" PRIu32,
556 : (int64_t)rowbytes, rowpixels);
557 0 : return (0);
558 : }
559 22 : sp->rowbytes = rowbytes;
560 22 : sp->rowpixels = rowpixels;
561 : /*
562 : * Allocate any additional space required for decoding/encoding.
563 : */
564 43 : needsRefLine = ((sp->groupoptions & GROUP3OPT_2DENCODING) ||
565 21 : td->td_compression == COMPRESSION_CCITTFAX4);
566 :
567 : /*
568 : Assure that allocation computations do not overflow.
569 :
570 : TIFFroundup and TIFFSafeMultiply return zero on integer overflow
571 : */
572 22 : dsp->runs = (uint32_t *)NULL;
573 22 : dsp->nruns = TIFFroundup_32(rowpixels + 1, 32);
574 22 : if (needsRefLine)
575 : {
576 18 : dsp->nruns = TIFFSafeMultiply(uint32_t, dsp->nruns, 2);
577 : }
578 22 : if ((dsp->nruns == 0) || (TIFFSafeMultiply(uint32_t, dsp->nruns, 2) == 0))
579 : {
580 0 : TIFFErrorExtR(tif, tif->tif_name,
581 : "Row pixels integer overflow (rowpixels %" PRIu32 ")",
582 : rowpixels);
583 0 : return (0);
584 : }
585 22 : dsp->runs = (uint32_t *)_TIFFCheckMalloc(
586 22 : tif, TIFFSafeMultiply(uint32_t, dsp->nruns, 2), sizeof(uint32_t),
587 : "for Group 3/4 run arrays");
588 22 : if (dsp->runs == NULL)
589 0 : return (0);
590 0 : memset(dsp->runs, 0,
591 22 : TIFFSafeMultiply(uint32_t, dsp->nruns, 2) * sizeof(uint32_t));
592 22 : dsp->curruns = dsp->runs;
593 22 : if (needsRefLine)
594 18 : dsp->refruns = dsp->runs + dsp->nruns;
595 : else
596 4 : dsp->refruns = NULL;
597 22 : if (td->td_compression == COMPRESSION_CCITTFAX3 && is2DEncoding(dsp))
598 : { /* NB: default is 1D routine */
599 1 : tif->tif_decoderow = Fax3Decode2D;
600 1 : tif->tif_decodestrip = Fax3Decode2D;
601 1 : tif->tif_decodetile = Fax3Decode2D;
602 : }
603 :
604 22 : if (needsRefLine)
605 : { /* 2d encoding */
606 18 : Fax3CodecState *esp = EncoderState(tif);
607 : /*
608 : * 2d encoding requires a scanline
609 : * buffer for the ``reference line''; the
610 : * scanline against which delta encoding
611 : * is referenced. The reference line must
612 : * be initialized to be ``white'' (done elsewhere).
613 : */
614 18 : esp->refline = (unsigned char *)_TIFFmallocExt(tif, rowbytes);
615 18 : if (esp->refline == NULL)
616 : {
617 0 : TIFFErrorExtR(tif, module, "No space for Group 3/4 reference line");
618 0 : return (0);
619 : }
620 : }
621 : else /* 1d encoding */
622 4 : EncoderState(tif)->refline = NULL;
623 :
624 22 : return (1);
625 : }
626 :
627 : /*
628 : * CCITT Group 3 FAX Encoding.
629 : */
630 :
631 : #define Fax3FlushBits(tif, sp) \
632 : { \
633 : if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
634 : { \
635 : if (!TIFFFlushData1(tif)) \
636 : return 0; \
637 : } \
638 : *(tif)->tif_rawcp++ = (uint8_t)(sp)->data; \
639 : (tif)->tif_rawcc++; \
640 : (sp)->data = 0, (sp)->bit = 8; \
641 : }
642 : #define _FlushBits(tif) \
643 : { \
644 : if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
645 : { \
646 : if (!TIFFFlushData1(tif)) \
647 : return 0; \
648 : } \
649 : *(tif)->tif_rawcp++ = (uint8_t)data; \
650 : (tif)->tif_rawcc++; \
651 : data = 0, bit = 8; \
652 : }
653 : static const int _msbmask[9] = {0x00, 0x01, 0x03, 0x07, 0x0f,
654 : 0x1f, 0x3f, 0x7f, 0xff};
655 : #define _PutBits(tif, bits, length) \
656 : { \
657 : while (length > bit) \
658 : { \
659 : data |= bits >> (length - bit); \
660 : length -= bit; \
661 : _FlushBits(tif); \
662 : } \
663 : assert(length < 9); \
664 : data |= (bits & _msbmask[length]) << (bit - length); \
665 : bit -= length; \
666 : if (bit == 0) \
667 : _FlushBits(tif); \
668 : }
669 :
670 : /*
671 : * Write a variable-length bit-value to
672 : * the output stream. Values are
673 : * assumed to be at most 16 bits.
674 : */
675 43734 : static int Fax3PutBits(TIFF *tif, unsigned int bits, unsigned int length)
676 : {
677 43734 : Fax3CodecState *sp = EncoderState(tif);
678 43734 : unsigned int bit = sp->bit;
679 43734 : int data = sp->data;
680 :
681 50366 : _PutBits(tif, bits, length);
682 :
683 43734 : sp->data = data;
684 43734 : sp->bit = bit;
685 43734 : return 1;
686 : }
687 :
688 : /*
689 : * Write a code to the output stream.
690 : */
691 : #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
692 :
693 : #ifdef FAX3_DEBUG
694 : #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
695 : #define DEBUG_PRINT(what, len) \
696 : { \
697 : int t; \
698 : printf("%08" PRIX32 "/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), \
699 : len); \
700 : for (t = length - 1; t >= 0; t--) \
701 : putchar(code & (1 << t) ? '1' : '0'); \
702 : putchar('\n'); \
703 : }
704 : #endif
705 :
706 : /*
707 : * Write the sequence of codes that describes
708 : * the specified span of zero's or one's. The
709 : * appropriate table that holds the make-up and
710 : * terminating codes is supplied.
711 : */
712 13030 : static int putspan(TIFF *tif, int32_t span, const tableentry *tab)
713 : {
714 13030 : Fax3CodecState *sp = EncoderState(tif);
715 13030 : unsigned int bit = sp->bit;
716 13030 : int data = sp->data;
717 : unsigned int code, length;
718 :
719 13030 : while (span >= 2624)
720 : {
721 0 : const tableentry *te = &tab[63 + (2560 >> 6)];
722 0 : code = te->code;
723 0 : length = te->length;
724 : #ifdef FAX3_DEBUG
725 : DEBUG_PRINT("MakeUp", te->runlen);
726 : #endif
727 0 : _PutBits(tif, code, length);
728 0 : span -= te->runlen;
729 : }
730 13030 : if (span >= 64)
731 : {
732 418 : const tableentry *te = &tab[63 + (span >> 6)];
733 418 : assert(te->runlen == 64 * (span >> 6));
734 418 : code = te->code;
735 418 : length = te->length;
736 : #ifdef FAX3_DEBUG
737 : DEBUG_PRINT("MakeUp", te->runlen);
738 : #endif
739 969 : _PutBits(tif, code, length);
740 418 : span -= te->runlen;
741 : }
742 13030 : code = tab[span].code;
743 13030 : length = tab[span].length;
744 : #ifdef FAX3_DEBUG
745 : DEBUG_PRINT(" Term", tab[span].runlen);
746 : #endif
747 19233 : _PutBits(tif, code, length);
748 :
749 13030 : sp->data = data;
750 13030 : sp->bit = bit;
751 :
752 13030 : return 1;
753 : }
754 :
755 : /*
756 : * Write an EOL code to the output stream. The zero-fill
757 : * logic for byte-aligning encoded scanlines is handled
758 : * here. We also handle writing the tag bit for the next
759 : * scanline when doing 2d encoding.
760 : */
761 99 : static int Fax3PutEOL(TIFF *tif)
762 : {
763 99 : Fax3CodecState *sp = EncoderState(tif);
764 99 : unsigned int bit = sp->bit;
765 99 : int data = sp->data;
766 : unsigned int code, length, tparm;
767 :
768 99 : if (sp->b.groupoptions & GROUP3OPT_FILLBITS)
769 : {
770 : /*
771 : * Force bit alignment so EOL will terminate on
772 : * a byte boundary. That is, force the bit alignment
773 : * to 16-12 = 4 before putting out the EOL code.
774 : */
775 0 : int align = 8 - 4;
776 0 : if (align != sp->bit)
777 : {
778 0 : if (align > sp->bit)
779 0 : align = sp->bit + (8 - align);
780 : else
781 0 : align = sp->bit - align;
782 0 : tparm = align;
783 0 : _PutBits(tif, 0, tparm);
784 : }
785 : }
786 99 : code = EOL;
787 99 : length = 12;
788 99 : if (is2DEncoding(sp))
789 : {
790 0 : code = (code << 1) | (sp->tag == G3_1D);
791 0 : length++;
792 : }
793 242 : _PutBits(tif, code, length);
794 :
795 99 : sp->data = data;
796 99 : sp->bit = bit;
797 :
798 99 : return 1;
799 : }
800 :
801 : /*
802 : * Reset encoding state at the start of a strip.
803 : */
804 9 : static int Fax3PreEncode(TIFF *tif, uint16_t s)
805 : {
806 9 : Fax3CodecState *sp = EncoderState(tif);
807 :
808 : (void)s;
809 9 : assert(sp != NULL);
810 9 : sp->bit = 8;
811 9 : sp->data = 0;
812 9 : sp->tag = G3_1D;
813 : /*
814 : * This is necessary for Group 4; otherwise it isn't
815 : * needed because the first scanline of each strip ends
816 : * up being copied into the refline.
817 : */
818 9 : if (sp->refline)
819 7 : _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
820 9 : if (is2DEncoding(sp))
821 : {
822 0 : float res = tif->tif_dir.td_yresolution;
823 : /*
824 : * The CCITT spec says that when doing 2d encoding, you
825 : * should only do it on K consecutive scanlines, where K
826 : * depends on the resolution of the image being encoded
827 : * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
828 : * code initializes td_yresolution to 0, this code will
829 : * select a K of 2 unless the YResolution tag is set
830 : * appropriately. (Note also that we fudge a little here
831 : * and use 150 lpi to avoid problems with units conversion.)
832 : */
833 0 : if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
834 0 : res *= 2.54f; /* convert to inches */
835 0 : sp->maxk = (res > 150 ? 4 : 2);
836 0 : sp->k = sp->maxk - 1;
837 : }
838 : else
839 9 : sp->k = sp->maxk = 0;
840 9 : sp->line = 0;
841 9 : return (1);
842 : }
843 :
844 : static const unsigned char zeroruns[256] = {
845 : 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
846 : 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
847 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
848 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
849 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
850 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
851 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
852 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
853 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
854 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
855 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
856 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
857 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
858 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
859 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
860 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
861 : };
862 : static const unsigned char oneruns[256] = {
863 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
864 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
865 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
866 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
867 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
868 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
869 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
870 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
871 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
872 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
873 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
874 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
875 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
876 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
877 : 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
878 : 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
879 : };
880 :
881 : /*
882 : * Find a span of ones or zeros using the supplied
883 : * table. The ``base'' of the bit string is supplied
884 : * along with the start+end bit indices.
885 : */
886 69633 : static inline int32_t find0span(unsigned char *bp, int32_t bs, int32_t be)
887 : {
888 69633 : int32_t bits = be - bs;
889 : int32_t n, span;
890 :
891 69633 : bp += bs >> 3;
892 : /*
893 : * Check partial byte on lhs.
894 : */
895 69633 : if (bits > 0 && (n = (bs & 7)) != 0)
896 : {
897 53657 : span = zeroruns[(*bp << n) & 0xff];
898 53657 : if (span > 8 - n) /* table value too generous */
899 29826 : span = 8 - n;
900 53657 : if (span > bits) /* constrain span to bit range */
901 359 : span = bits;
902 53657 : if (n + span < 8) /* doesn't extend to edge of byte */
903 24190 : return (span);
904 29467 : bits -= span;
905 29467 : bp++;
906 : }
907 : else
908 15976 : span = 0;
909 45443 : if (bits >= (int32_t)(2 * 8 * sizeof(int64_t)))
910 : {
911 : int64_t *lp;
912 : /*
913 : * Align to int64_t boundary and check int64_t words.
914 : */
915 54272 : while (!isAligned(bp, int64_t))
916 : {
917 38361 : if (*bp != 0x00)
918 15909 : return (span + zeroruns[*bp]);
919 22452 : span += 8;
920 22452 : bits -= 8;
921 22452 : bp++;
922 : }
923 15911 : lp = (int64_t *)bp;
924 17290 : while ((bits >= (int32_t)(8 * sizeof(int64_t))) && (0 == *lp))
925 : {
926 1379 : span += 8 * sizeof(int64_t);
927 1379 : bits -= 8 * sizeof(int64_t);
928 1379 : lp++;
929 : }
930 15911 : bp = (unsigned char *)lp;
931 : }
932 : /*
933 : * Scan full bytes for all 0's.
934 : */
935 50893 : while (bits >= 8)
936 : {
937 48775 : if (*bp != 0x00) /* end of run */
938 27416 : return (span + zeroruns[*bp]);
939 21359 : span += 8;
940 21359 : bits -= 8;
941 21359 : bp++;
942 : }
943 : /*
944 : * Check partial byte on rhs.
945 : */
946 2118 : if (bits > 0)
947 : {
948 2002 : n = zeroruns[*bp];
949 2002 : span += (n > bits ? bits : n);
950 : }
951 2118 : return (span);
952 : }
953 :
954 83357 : static inline int32_t find1span(unsigned char *bp, int32_t bs, int32_t be)
955 : {
956 83357 : int32_t bits = be - bs;
957 : int32_t n, span;
958 :
959 83357 : bp += bs >> 3;
960 : /*
961 : * Check partial byte on lhs.
962 : */
963 83357 : if (bits > 0 && (n = (bs & 7)) != 0)
964 : {
965 53819 : span = oneruns[(*bp << n) & 0xff];
966 53819 : if (span > 8 - n) /* table value too generous */
967 0 : span = 8 - n;
968 53819 : if (span > bits) /* constrain span to bit range */
969 0 : span = bits;
970 53819 : if (n + span < 8) /* doesn't extend to edge of byte */
971 24458 : return (span);
972 29361 : bits -= span;
973 29361 : bp++;
974 : }
975 : else
976 29538 : span = 0;
977 58899 : if (bits >= (int32_t)(2 * 8 * sizeof(int64_t)))
978 : {
979 : int64_t *lp;
980 : /*
981 : * Align to int64_t boundary and check int64_t words.
982 : */
983 94760 : while (!isAligned(bp, int64_t))
984 : {
985 61078 : if (*bp != 0xff)
986 11996 : return (span + oneruns[*bp]);
987 49082 : span += 8;
988 49082 : bits -= 8;
989 49082 : bp++;
990 : }
991 33682 : lp = (int64_t *)bp;
992 338421 : while ((bits >= (int32_t)(8 * sizeof(int64_t))) &&
993 317978 : (~((uint64_t)0) == (uint64_t)*lp))
994 : {
995 304739 : span += 8 * sizeof(int64_t);
996 304739 : bits -= 8 * sizeof(int64_t);
997 304739 : lp++;
998 : }
999 33682 : bp = (unsigned char *)lp;
1000 : }
1001 : /*
1002 : * Scan full bytes for all 1's.
1003 : */
1004 206691 : while (bits >= 8)
1005 : {
1006 184031 : if (*bp != 0xff) /* end of run */
1007 24243 : return (span + oneruns[*bp]);
1008 159788 : span += 8;
1009 159788 : bits -= 8;
1010 159788 : bp++;
1011 : }
1012 : /*
1013 : * Check partial byte on rhs.
1014 : */
1015 22660 : if (bits > 0)
1016 : {
1017 888 : n = oneruns[*bp];
1018 888 : span += (n > bits ? bits : n);
1019 : }
1020 22660 : return (span);
1021 : }
1022 :
1023 : /*
1024 : * Return the offset of the next bit in the range
1025 : * [bs..be] that is different from the specified
1026 : * color. The end, be, is returned if no such bit
1027 : * exists.
1028 : */
1029 : #define finddiff(_cp, _bs, _be, _color) \
1030 : (_bs + (_color ? find1span(_cp, _bs, _be) : find0span(_cp, _bs, _be)))
1031 : /*
1032 : * Like finddiff, but also check the starting bit
1033 : * against the end in case start > end.
1034 : */
1035 : #define finddiff2(_cp, _bs, _be, _color) \
1036 : (_bs < _be ? finddiff(_cp, _bs, _be, _color) : _be)
1037 :
1038 : /*
1039 : * 1d-encode a row of pixels. The encoding is
1040 : * a sequence of all-white or all-black spans
1041 : * of pixels encoded with Huffman codes.
1042 : */
1043 198 : static int Fax3Encode1DRow(TIFF *tif, unsigned char *bp, uint32_t bits)
1044 : {
1045 198 : Fax3CodecState *sp = EncoderState(tif);
1046 : int32_t span;
1047 198 : uint32_t bs = 0;
1048 :
1049 : for (;;)
1050 : {
1051 2646 : span = find0span(bp, bs, bits); /* white span */
1052 2646 : if (!putspan(tif, span, TIFFFaxWhiteCodes))
1053 0 : return 0;
1054 2646 : bs += span;
1055 2646 : if (bs >= bits)
1056 52 : break;
1057 2594 : span = find1span(bp, bs, bits); /* black span */
1058 2594 : if (!putspan(tif, span, TIFFFaxBlackCodes))
1059 0 : return 0;
1060 2594 : bs += span;
1061 2594 : if (bs >= bits)
1062 146 : break;
1063 : }
1064 198 : if (sp->b.mode & (FAXMODE_BYTEALIGN | FAXMODE_WORDALIGN))
1065 : {
1066 99 : if (sp->bit != 8) /* byte-align */
1067 89 : Fax3FlushBits(tif, sp);
1068 99 : if ((sp->b.mode & FAXMODE_WORDALIGN) &&
1069 0 : !isAligned(tif->tif_rawcp, uint16_t))
1070 0 : Fax3FlushBits(tif, sp);
1071 : }
1072 198 : return (1);
1073 : }
1074 :
1075 : static const tableentry horizcode = {3, 0x1, 0}; /* 001 */
1076 : static const tableentry passcode = {4, 0x1, 0}; /* 0001 */
1077 : static const tableentry vcodes[7] = {
1078 : {7, 0x03, 0}, /* 0000 011 */
1079 : {6, 0x03, 0}, /* 0000 11 */
1080 : {3, 0x03, 0}, /* 011 */
1081 : {1, 0x1, 0}, /* 1 */
1082 : {3, 0x2, 0}, /* 010 */
1083 : {6, 0x02, 0}, /* 0000 10 */
1084 : {7, 0x02, 0} /* 0000 010 */
1085 : };
1086 :
1087 : /*
1088 : * 2d-encode a row of pixels. Consult the CCITT
1089 : * documentation for the algorithm.
1090 : */
1091 7897 : static int Fax3Encode2DRow(TIFF *tif, unsigned char *bp, unsigned char *rp,
1092 : uint32_t bits)
1093 : {
1094 : #define PIXEL(buf, ix) ((((buf)[(ix) >> 3]) >> (7 - ((ix)&7))) & 1)
1095 7897 : uint32_t a0 = 0;
1096 7897 : uint32_t a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0));
1097 7897 : uint32_t b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0));
1098 : uint32_t a2, b2;
1099 :
1100 : for (;;)
1101 : {
1102 43720 : b2 = finddiff2(rp, b1, bits, PIXEL(rp, b1));
1103 43720 : if (b2 >= a1)
1104 : {
1105 : /* Naive computation triggers
1106 : * -fsanitize=undefined,unsigned-integer-overflow */
1107 : /* although it is correct unless the difference between both is < 31
1108 : * bit */
1109 : /* int32_t d = b1 - a1; */
1110 36175 : int32_t d = (b1 >= a1 && b1 - a1 <= 3U) ? (int32_t)(b1 - a1)
1111 86693 : : (b1 < a1 && a1 - b1 <= 3U) ? -(int32_t)(a1 - b1)
1112 13042 : : 0x7FFFFFFF;
1113 40956 : if (!(-3 <= d && d <= 3))
1114 : { /* horizontal mode */
1115 3895 : a2 = finddiff2(bp, a1, bits, PIXEL(bp, a1));
1116 3895 : if (!putcode(tif, &horizcode))
1117 0 : return 0;
1118 3895 : if (a0 + a1 == 0 || PIXEL(bp, a0) == 0)
1119 : {
1120 1950 : if (!putspan(tif, a1 - a0, TIFFFaxWhiteCodes))
1121 0 : return 0;
1122 1950 : if (!putspan(tif, a2 - a1, TIFFFaxBlackCodes))
1123 0 : return 0;
1124 : }
1125 : else
1126 : {
1127 1945 : if (!putspan(tif, a1 - a0, TIFFFaxBlackCodes))
1128 0 : return 0;
1129 1945 : if (!putspan(tif, a2 - a1, TIFFFaxWhiteCodes))
1130 0 : return 0;
1131 : }
1132 3895 : a0 = a2;
1133 : }
1134 : else
1135 : { /* vertical mode */
1136 37061 : if (!putcode(tif, &vcodes[d + 3]))
1137 0 : return 0;
1138 37061 : a0 = a1;
1139 : }
1140 : }
1141 : else
1142 : { /* pass mode */
1143 2764 : if (!putcode(tif, &passcode))
1144 0 : return 0;
1145 2764 : a0 = b2;
1146 : }
1147 43720 : if (a0 >= bits)
1148 7897 : break;
1149 35823 : a1 = finddiff(bp, a0, bits, PIXEL(bp, a0));
1150 35823 : b1 = finddiff(rp, a0, bits, !PIXEL(bp, a0));
1151 35823 : b1 = finddiff(rp, b1, bits, PIXEL(bp, a0));
1152 : }
1153 7897 : return (1);
1154 : #undef PIXEL
1155 : }
1156 :
1157 : /*
1158 : * Encode a buffer of pixels.
1159 : */
1160 2 : static int Fax3Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
1161 : {
1162 : static const char module[] = "Fax3Encode";
1163 2 : Fax3CodecState *sp = EncoderState(tif);
1164 : (void)s;
1165 2 : if (cc % sp->b.rowbytes)
1166 : {
1167 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be written");
1168 0 : return (0);
1169 : }
1170 200 : while (cc > 0)
1171 : {
1172 198 : if ((sp->b.mode & FAXMODE_NOEOL) == 0)
1173 : {
1174 99 : if (!Fax3PutEOL(tif))
1175 0 : return 0;
1176 : }
1177 198 : if (is2DEncoding(sp))
1178 : {
1179 0 : if (sp->tag == G3_1D)
1180 : {
1181 0 : if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1182 0 : return (0);
1183 0 : sp->tag = G3_2D;
1184 : }
1185 : else
1186 : {
1187 0 : if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1188 0 : return (0);
1189 0 : sp->k--;
1190 : }
1191 0 : if (sp->k == 0)
1192 : {
1193 0 : sp->tag = G3_1D;
1194 0 : sp->k = sp->maxk - 1;
1195 : }
1196 : else
1197 0 : _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1198 : }
1199 : else
1200 : {
1201 198 : if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1202 0 : return (0);
1203 : }
1204 198 : bp += sp->b.rowbytes;
1205 198 : cc -= sp->b.rowbytes;
1206 : }
1207 2 : return (1);
1208 : }
1209 :
1210 2 : static int Fax3PostEncode(TIFF *tif)
1211 : {
1212 2 : Fax3CodecState *sp = EncoderState(tif);
1213 :
1214 2 : if (sp->bit != 8)
1215 1 : Fax3FlushBits(tif, sp);
1216 2 : return (1);
1217 : }
1218 :
1219 17 : static int _Fax3Close(TIFF *tif)
1220 : {
1221 17 : if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0 && tif->tif_rawcp)
1222 : {
1223 0 : Fax3CodecState *sp = EncoderState(tif);
1224 0 : unsigned int code = EOL;
1225 0 : unsigned int length = 12;
1226 : int i;
1227 :
1228 0 : if (is2DEncoding(sp))
1229 : {
1230 0 : code = (code << 1) | (sp->tag == G3_1D);
1231 0 : length++;
1232 : }
1233 0 : for (i = 0; i < 6; i++)
1234 0 : Fax3PutBits(tif, code, length);
1235 0 : Fax3FlushBits(tif, sp);
1236 : }
1237 17 : return 1;
1238 : }
1239 :
1240 17 : static void Fax3Close(TIFF *tif) { _Fax3Close(tif); }
1241 :
1242 70 : static void Fax3Cleanup(TIFF *tif)
1243 : {
1244 70 : Fax3CodecState *sp = DecoderState(tif);
1245 :
1246 70 : assert(sp != 0);
1247 :
1248 70 : tif->tif_tagmethods.vgetfield = sp->b.vgetparent;
1249 70 : tif->tif_tagmethods.vsetfield = sp->b.vsetparent;
1250 70 : tif->tif_tagmethods.printdir = sp->b.printdir;
1251 :
1252 70 : if (sp->runs)
1253 22 : _TIFFfreeExt(tif, sp->runs);
1254 70 : if (sp->refline)
1255 18 : _TIFFfreeExt(tif, sp->refline);
1256 :
1257 70 : _TIFFfreeExt(tif, tif->tif_data);
1258 70 : tif->tif_data = NULL;
1259 :
1260 70 : _TIFFSetDefaultCompressionState(tif);
1261 70 : }
1262 :
1263 : #define FIELD_BADFAXLINES (FIELD_CODEC + 0)
1264 : #define FIELD_CLEANFAXDATA (FIELD_CODEC + 1)
1265 : #define FIELD_BADFAXRUN (FIELD_CODEC + 2)
1266 :
1267 : #define FIELD_OPTIONS (FIELD_CODEC + 7)
1268 :
1269 : static const TIFFField faxFields[] = {
1270 : {TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED,
1271 : FIELD_PSEUDO, FALSE, FALSE, "FaxMode", NULL},
1272 : {TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_OTHER,
1273 : TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, FALSE, FALSE, "FaxFillFunc", NULL},
1274 : {TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32,
1275 : TIFF_SETGET_UINT32, FIELD_BADFAXLINES, TRUE, FALSE, "BadFaxLines", NULL},
1276 : {TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16,
1277 : TIFF_SETGET_UINT16, FIELD_CLEANFAXDATA, TRUE, FALSE, "CleanFaxData", NULL},
1278 : {TIFFTAG_CONSECUTIVEBADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32,
1279 : TIFF_SETGET_UINT32, FIELD_BADFAXRUN, TRUE, FALSE, "ConsecutiveBadFaxLines",
1280 : NULL}};
1281 : static const TIFFField fax3Fields[] = {
1282 : {TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32,
1283 : TIFF_SETGET_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group3Options", NULL},
1284 : };
1285 : static const TIFFField fax4Fields[] = {
1286 : {TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32,
1287 : TIFF_SETGET_UINT32, FIELD_OPTIONS, FALSE, FALSE, "Group4Options", NULL},
1288 : };
1289 :
1290 616 : static int Fax3VSetField(TIFF *tif, uint32_t tag, va_list ap)
1291 : {
1292 616 : Fax3BaseState *sp = Fax3State(tif);
1293 : const TIFFField *fip;
1294 :
1295 616 : assert(sp != 0);
1296 616 : assert(sp->vsetparent != 0);
1297 :
1298 616 : switch (tag)
1299 : {
1300 70 : case TIFFTAG_FAXMODE:
1301 70 : sp->mode = (int)va_arg(ap, int);
1302 70 : return 1; /* NB: pseudo tag */
1303 70 : case TIFFTAG_FAXFILLFUNC:
1304 70 : DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc);
1305 70 : return 1; /* NB: pseudo tag */
1306 2 : case TIFFTAG_GROUP3OPTIONS:
1307 : /* XXX: avoid reading options if compression mismatches. */
1308 2 : if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3)
1309 2 : sp->groupoptions = (uint32_t)va_arg(ap, uint32_t);
1310 2 : break;
1311 0 : case TIFFTAG_GROUP4OPTIONS:
1312 : /* XXX: avoid reading options if compression mismatches. */
1313 0 : if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1314 0 : sp->groupoptions = (uint32_t)va_arg(ap, uint32_t);
1315 0 : break;
1316 0 : case TIFFTAG_BADFAXLINES:
1317 0 : sp->badfaxlines = (uint32_t)va_arg(ap, uint32_t);
1318 0 : break;
1319 0 : case TIFFTAG_CLEANFAXDATA:
1320 0 : sp->cleanfaxdata = (uint16_t)va_arg(ap, uint16_vap);
1321 0 : break;
1322 0 : case TIFFTAG_CONSECUTIVEBADFAXLINES:
1323 0 : sp->badfaxrun = (uint32_t)va_arg(ap, uint32_t);
1324 0 : break;
1325 474 : default:
1326 474 : return (*sp->vsetparent)(tif, tag, ap);
1327 : }
1328 :
1329 2 : if ((fip = TIFFFieldWithTag(tif, tag)) != NULL)
1330 2 : TIFFSetFieldBit(tif, fip->field_bit);
1331 : else
1332 0 : return 0;
1333 :
1334 2 : tif->tif_flags |= TIFF_DIRTYDIRECT;
1335 2 : return 1;
1336 : }
1337 :
1338 741 : static int Fax3VGetField(TIFF *tif, uint32_t tag, va_list ap)
1339 : {
1340 741 : Fax3BaseState *sp = Fax3State(tif);
1341 :
1342 741 : assert(sp != 0);
1343 :
1344 741 : switch (tag)
1345 : {
1346 0 : case TIFFTAG_FAXMODE:
1347 0 : *va_arg(ap, int *) = sp->mode;
1348 0 : break;
1349 0 : case TIFFTAG_FAXFILLFUNC:
1350 0 : *va_arg(ap, TIFFFaxFillFunc *) = DecoderState(tif)->fill;
1351 0 : break;
1352 2 : case TIFFTAG_GROUP3OPTIONS:
1353 : case TIFFTAG_GROUP4OPTIONS:
1354 2 : *va_arg(ap, uint32_t *) = sp->groupoptions;
1355 2 : break;
1356 0 : case TIFFTAG_BADFAXLINES:
1357 0 : *va_arg(ap, uint32_t *) = sp->badfaxlines;
1358 0 : break;
1359 0 : case TIFFTAG_CLEANFAXDATA:
1360 0 : *va_arg(ap, uint16_t *) = sp->cleanfaxdata;
1361 0 : break;
1362 0 : case TIFFTAG_CONSECUTIVEBADFAXLINES:
1363 0 : *va_arg(ap, uint32_t *) = sp->badfaxrun;
1364 0 : break;
1365 739 : default:
1366 739 : return (*sp->vgetparent)(tif, tag, ap);
1367 : }
1368 2 : return (1);
1369 : }
1370 :
1371 0 : static void Fax3PrintDir(TIFF *tif, FILE *fd, long flags)
1372 : {
1373 0 : Fax3BaseState *sp = Fax3State(tif);
1374 :
1375 0 : assert(sp != 0);
1376 :
1377 : (void)flags;
1378 0 : if (TIFFFieldSet(tif, FIELD_OPTIONS))
1379 : {
1380 0 : const char *sep = " ";
1381 0 : if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1382 : {
1383 0 : fprintf(fd, " Group 4 Options:");
1384 0 : if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED)
1385 0 : fprintf(fd, "%suncompressed data", sep);
1386 : }
1387 : else
1388 : {
1389 :
1390 0 : fprintf(fd, " Group 3 Options:");
1391 0 : if (sp->groupoptions & GROUP3OPT_2DENCODING)
1392 : {
1393 0 : fprintf(fd, "%s2-d encoding", sep);
1394 0 : sep = "+";
1395 : }
1396 0 : if (sp->groupoptions & GROUP3OPT_FILLBITS)
1397 : {
1398 0 : fprintf(fd, "%sEOL padding", sep);
1399 0 : sep = "+";
1400 : }
1401 0 : if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED)
1402 0 : fprintf(fd, "%suncompressed data", sep);
1403 : }
1404 0 : fprintf(fd, " (%" PRIu32 " = 0x%" PRIx32 ")\n", sp->groupoptions,
1405 : sp->groupoptions);
1406 : }
1407 0 : if (TIFFFieldSet(tif, FIELD_CLEANFAXDATA))
1408 : {
1409 0 : fprintf(fd, " Fax Data:");
1410 0 : switch (sp->cleanfaxdata)
1411 : {
1412 0 : case CLEANFAXDATA_CLEAN:
1413 0 : fprintf(fd, " clean");
1414 0 : break;
1415 0 : case CLEANFAXDATA_REGENERATED:
1416 0 : fprintf(fd, " receiver regenerated");
1417 0 : break;
1418 0 : case CLEANFAXDATA_UNCLEAN:
1419 0 : fprintf(fd, " uncorrected errors");
1420 0 : break;
1421 : }
1422 0 : fprintf(fd, " (%" PRIu16 " = 0x%" PRIx16 ")\n", sp->cleanfaxdata,
1423 0 : sp->cleanfaxdata);
1424 : }
1425 0 : if (TIFFFieldSet(tif, FIELD_BADFAXLINES))
1426 0 : fprintf(fd, " Bad Fax Lines: %" PRIu32 "\n", sp->badfaxlines);
1427 0 : if (TIFFFieldSet(tif, FIELD_BADFAXRUN))
1428 0 : fprintf(fd, " Consecutive Bad Fax Lines: %" PRIu32 "\n",
1429 : sp->badfaxrun);
1430 0 : if (sp->printdir)
1431 0 : (*sp->printdir)(tif, fd, flags);
1432 0 : }
1433 :
1434 70 : static int InitCCITTFax3(TIFF *tif)
1435 : {
1436 : static const char module[] = "InitCCITTFax3";
1437 : Fax3BaseState *sp;
1438 :
1439 : /*
1440 : * Merge codec-specific tag information.
1441 : */
1442 70 : if (!_TIFFMergeFields(tif, faxFields, TIFFArrayCount(faxFields)))
1443 : {
1444 0 : TIFFErrorExtR(tif, "InitCCITTFax3",
1445 : "Merging common CCITT Fax codec-specific tags failed");
1446 0 : return 0;
1447 : }
1448 :
1449 : /*
1450 : * Allocate state block so tag methods have storage to record values.
1451 : */
1452 70 : tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(Fax3CodecState));
1453 :
1454 70 : if (tif->tif_data == NULL)
1455 : {
1456 0 : TIFFErrorExtR(tif, module, "No space for state block");
1457 0 : return (0);
1458 : }
1459 70 : _TIFFmemset(tif->tif_data, 0, sizeof(Fax3CodecState));
1460 :
1461 70 : sp = Fax3State(tif);
1462 70 : sp->rw_mode = tif->tif_mode;
1463 :
1464 : /*
1465 : * Override parent get/set field methods.
1466 : */
1467 70 : sp->vgetparent = tif->tif_tagmethods.vgetfield;
1468 70 : tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */
1469 70 : sp->vsetparent = tif->tif_tagmethods.vsetfield;
1470 70 : tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */
1471 70 : sp->printdir = tif->tif_tagmethods.printdir;
1472 70 : tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */
1473 70 : sp->groupoptions = 0;
1474 :
1475 70 : if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */
1476 25 : tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */
1477 70 : DecoderState(tif)->runs = NULL;
1478 70 : TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns);
1479 70 : EncoderState(tif)->refline = NULL;
1480 :
1481 : /*
1482 : * Install codec methods.
1483 : */
1484 70 : tif->tif_fixuptags = Fax3FixupTags;
1485 70 : tif->tif_setupdecode = Fax3SetupState;
1486 70 : tif->tif_predecode = Fax3PreDecode;
1487 70 : tif->tif_decoderow = Fax3Decode1D;
1488 70 : tif->tif_decodestrip = Fax3Decode1D;
1489 70 : tif->tif_decodetile = Fax3Decode1D;
1490 70 : tif->tif_setupencode = Fax3SetupState;
1491 70 : tif->tif_preencode = Fax3PreEncode;
1492 70 : tif->tif_postencode = Fax3PostEncode;
1493 70 : tif->tif_encoderow = Fax3Encode;
1494 70 : tif->tif_encodestrip = Fax3Encode;
1495 70 : tif->tif_encodetile = Fax3Encode;
1496 70 : tif->tif_close = Fax3Close;
1497 70 : tif->tif_cleanup = Fax3Cleanup;
1498 :
1499 70 : return (1);
1500 : }
1501 :
1502 9 : int TIFFInitCCITTFax3(TIFF *tif, int scheme)
1503 : {
1504 : (void)scheme;
1505 9 : if (InitCCITTFax3(tif))
1506 : {
1507 : /*
1508 : * Merge codec-specific tag information.
1509 : */
1510 9 : if (!_TIFFMergeFields(tif, fax3Fields, TIFFArrayCount(fax3Fields)))
1511 : {
1512 0 : TIFFErrorExtR(tif, "TIFFInitCCITTFax3",
1513 : "Merging CCITT Fax 3 codec-specific tags failed");
1514 0 : return 0;
1515 : }
1516 :
1517 : /*
1518 : * The default format is Class/F-style w/o RTC.
1519 : */
1520 9 : return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
1521 : }
1522 : else
1523 0 : return 01;
1524 : }
1525 :
1526 : /*
1527 : * CCITT Group 4 (T.6) Facsimile-compatible
1528 : * Compression Scheme Support.
1529 : */
1530 :
1531 : #define SWAP(t, a, b) \
1532 : { \
1533 : t x; \
1534 : x = (a); \
1535 : (a) = (b); \
1536 : (b) = x; \
1537 : }
1538 : /*
1539 : * Decode the requested amount of G4-encoded data.
1540 : */
1541 21607 : static int Fax4Decode(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s)
1542 : {
1543 21607 : DECLARE_STATE_2D(tif, sp, "Fax4Decode");
1544 : (void)s;
1545 21607 : if (occ % sp->b.rowbytes)
1546 : {
1547 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read");
1548 0 : return (-1);
1549 : }
1550 21607 : if (sp->eofReachedCount >= EOF_REACHED_COUNT_THRESHOLD)
1551 : {
1552 0 : TIFFErrorExtR(
1553 : tif, module,
1554 : "End of file has already been reached %d times within that strip",
1555 : sp->eofReachedCount);
1556 0 : return (-1);
1557 : }
1558 21607 : CACHE_STATE(tif, sp);
1559 44302 : while (occ > 0)
1560 : {
1561 22695 : a0 = 0;
1562 22695 : RunLength = 0;
1563 22695 : pa = thisrun = sp->curruns;
1564 22695 : pb = sp->refruns;
1565 22695 : b1 = *pb++;
1566 : #ifdef FAX3_DEBUG
1567 : printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail);
1568 : printf("-------------------- %d\n", tif->tif_row);
1569 : fflush(stdout);
1570 : #endif
1571 151277 : EXPAND2D(EOFG4);
1572 22695 : if (EOLcnt)
1573 0 : goto EOFG4;
1574 22695 : if (((lastx + 7) >> 3) > (int)occ) /* check for buffer overrun */
1575 : {
1576 0 : TIFFErrorExtR(tif, module,
1577 : "Buffer overrun detected : %" TIFF_SSIZE_FORMAT
1578 : " bytes available, %d bits needed",
1579 : occ, lastx);
1580 0 : return -1;
1581 : }
1582 22695 : (*sp->fill)(buf, thisrun, pa, lastx);
1583 22695 : SETVALUE(0); /* imaginary change for reference */
1584 22695 : SWAP(uint32_t *, sp->curruns, sp->refruns);
1585 22695 : buf += sp->b.rowbytes;
1586 22695 : occ -= sp->b.rowbytes;
1587 22695 : sp->line++;
1588 22695 : continue;
1589 0 : EOFG4:
1590 0 : NeedBits16(13, BADG4);
1591 0 : BADG4:
1592 : #ifdef FAX3_DEBUG
1593 : if (GetBits(13) != 0x1001)
1594 : fputs("Bad EOFB\n", stderr);
1595 : #endif
1596 0 : ClrBits(13);
1597 0 : if (((lastx + 7) >> 3) > (int)occ) /* check for buffer overrun */
1598 : {
1599 0 : TIFFErrorExtR(tif, module,
1600 : "Buffer overrun detected : %" TIFF_SSIZE_FORMAT
1601 : " bytes available, %d bits needed",
1602 : occ, lastx);
1603 0 : return -1;
1604 : }
1605 0 : (*sp->fill)(buf, thisrun, pa, lastx);
1606 0 : UNCACHE_STATE(tif, sp);
1607 0 : return (sp->line ? 1 : -1); /* don't error on badly-terminated strips */
1608 : }
1609 21607 : UNCACHE_STATE(tif, sp);
1610 21607 : return (1);
1611 : }
1612 : #undef SWAP
1613 :
1614 : /*
1615 : * Encode the requested amount of data.
1616 : */
1617 7206 : static int Fax4Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
1618 : {
1619 : static const char module[] = "Fax4Encode";
1620 7206 : Fax3CodecState *sp = EncoderState(tif);
1621 : (void)s;
1622 7206 : if (cc % sp->b.rowbytes)
1623 : {
1624 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be written");
1625 0 : return (0);
1626 : }
1627 15103 : while (cc > 0)
1628 : {
1629 7897 : if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1630 0 : return (0);
1631 7897 : _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1632 7897 : bp += sp->b.rowbytes;
1633 7897 : cc -= sp->b.rowbytes;
1634 : }
1635 7206 : return (1);
1636 : }
1637 :
1638 7 : static int Fax4PostEncode(TIFF *tif)
1639 : {
1640 7 : Fax3CodecState *sp = EncoderState(tif);
1641 :
1642 : /* terminate strip w/ EOFB */
1643 7 : Fax3PutBits(tif, EOL, 12);
1644 7 : Fax3PutBits(tif, EOL, 12);
1645 7 : if (sp->bit != 8)
1646 7 : Fax3FlushBits(tif, sp);
1647 7 : return (1);
1648 : }
1649 :
1650 53 : int TIFFInitCCITTFax4(TIFF *tif, int scheme)
1651 : {
1652 : (void)scheme;
1653 53 : if (InitCCITTFax3(tif))
1654 : { /* reuse G3 support */
1655 : /*
1656 : * Merge codec-specific tag information.
1657 : */
1658 53 : if (!_TIFFMergeFields(tif, fax4Fields, TIFFArrayCount(fax4Fields)))
1659 : {
1660 0 : TIFFErrorExtR(tif, "TIFFInitCCITTFax4",
1661 : "Merging CCITT Fax 4 codec-specific tags failed");
1662 0 : return 0;
1663 : }
1664 :
1665 53 : tif->tif_decoderow = Fax4Decode;
1666 53 : tif->tif_decodestrip = Fax4Decode;
1667 53 : tif->tif_decodetile = Fax4Decode;
1668 53 : tif->tif_encoderow = Fax4Encode;
1669 53 : tif->tif_encodestrip = Fax4Encode;
1670 53 : tif->tif_encodetile = Fax4Encode;
1671 53 : tif->tif_postencode = Fax4PostEncode;
1672 : /*
1673 : * Suppress RTC at the end of each strip.
1674 : */
1675 53 : return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC);
1676 : }
1677 : else
1678 0 : return (0);
1679 : }
1680 :
1681 : /*
1682 : * CCITT Group 3 1-D Modified Huffman RLE Compression Support.
1683 : * (Compression algorithms 2 and 32771)
1684 : */
1685 :
1686 : /*
1687 : * Decode the requested amount of RLE-encoded data.
1688 : */
1689 1 : static int Fax3DecodeRLE(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s)
1690 : {
1691 1 : DECLARE_STATE(tif, sp, "Fax3DecodeRLE");
1692 1 : int mode = sp->b.mode;
1693 : (void)s;
1694 1 : if (occ % sp->b.rowbytes)
1695 : {
1696 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read");
1697 0 : return (-1);
1698 : }
1699 1 : CACHE_STATE(tif, sp);
1700 1 : thisrun = sp->curruns;
1701 100 : while (occ > 0)
1702 : {
1703 99 : a0 = 0;
1704 99 : RunLength = 0;
1705 99 : pa = thisrun;
1706 : #ifdef FAX3_DEBUG
1707 : printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail);
1708 : printf("-------------------- %" PRIu32 "\n", tif->tif_row);
1709 : fflush(stdout);
1710 : #endif
1711 1323 : EXPAND1D(EOFRLE);
1712 99 : (*sp->fill)(buf, thisrun, pa, lastx);
1713 : /*
1714 : * Cleanup at the end of the row.
1715 : */
1716 99 : if (mode & FAXMODE_BYTEALIGN)
1717 : {
1718 99 : int n = BitsAvail - (BitsAvail & ~7);
1719 99 : ClrBits(n);
1720 : }
1721 0 : else if (mode & FAXMODE_WORDALIGN)
1722 : {
1723 0 : int n = BitsAvail - (BitsAvail & ~15);
1724 0 : ClrBits(n);
1725 0 : if (BitsAvail == 0 && !isAligned(cp, uint16_t))
1726 0 : cp++;
1727 : }
1728 99 : buf += sp->b.rowbytes;
1729 99 : occ -= sp->b.rowbytes;
1730 99 : sp->line++;
1731 99 : continue;
1732 0 : EOFRLE: /* premature EOF */
1733 0 : (*sp->fill)(buf, thisrun, pa, lastx);
1734 0 : UNCACHE_STATE(tif, sp);
1735 0 : return (-1);
1736 : }
1737 1 : UNCACHE_STATE(tif, sp);
1738 1 : return (1);
1739 : }
1740 :
1741 8 : int TIFFInitCCITTRLE(TIFF *tif, int scheme)
1742 : {
1743 : (void)scheme;
1744 8 : if (InitCCITTFax3(tif))
1745 : { /* reuse G3 support */
1746 8 : tif->tif_decoderow = Fax3DecodeRLE;
1747 8 : tif->tif_decodestrip = Fax3DecodeRLE;
1748 8 : tif->tif_decodetile = Fax3DecodeRLE;
1749 : /*
1750 : * Suppress RTC+EOLs when encoding and byte-align data.
1751 : */
1752 8 : return TIFFSetField(tif, TIFFTAG_FAXMODE,
1753 : FAXMODE_NORTC | FAXMODE_NOEOL | FAXMODE_BYTEALIGN);
1754 : }
1755 : else
1756 0 : return (0);
1757 : }
1758 :
1759 0 : int TIFFInitCCITTRLEW(TIFF *tif, int scheme)
1760 : {
1761 : (void)scheme;
1762 0 : if (InitCCITTFax3(tif))
1763 : { /* reuse G3 support */
1764 0 : tif->tif_decoderow = Fax3DecodeRLE;
1765 0 : tif->tif_decodestrip = Fax3DecodeRLE;
1766 0 : tif->tif_decodetile = Fax3DecodeRLE;
1767 : /*
1768 : * Suppress RTC+EOLs when encoding and word-align data.
1769 : */
1770 0 : return TIFFSetField(tif, TIFFTAG_FAXMODE,
1771 : FAXMODE_NORTC | FAXMODE_NOEOL | FAXMODE_WORDALIGN);
1772 : }
1773 : else
1774 0 : return (0);
1775 : }
1776 : #endif /* CCITT_SUPPORT */
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