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 22 : if (td->td_samplesperpixel != 1 &&
539 0 : td->td_planarconfig != PLANARCONFIG_SEPARATE)
540 : {
541 0 : TIFFErrorExtR(
542 : tif, module,
543 : "Samples/pixel shall be 1 for Group 3/4 encoding/decoding, "
544 : "or PlanarConfiguration must be set to Separate.");
545 0 : return 0;
546 : }
547 : /*
548 : * Calculate the scanline/tile widths.
549 : */
550 22 : if (isTiled(tif))
551 : {
552 0 : rowbytes = TIFFTileRowSize(tif);
553 0 : rowpixels = td->td_tilewidth;
554 : }
555 : else
556 : {
557 22 : rowbytes = TIFFScanlineSize(tif);
558 22 : rowpixels = td->td_imagewidth;
559 : }
560 22 : if ((int64_t)rowbytes < ((int64_t)rowpixels + 7) / 8)
561 : {
562 0 : TIFFErrorExtR(tif, module,
563 : "Inconsistent number of bytes per row : rowbytes=%" PRId64
564 : " rowpixels=%" PRIu32,
565 : (int64_t)rowbytes, rowpixels);
566 0 : return (0);
567 : }
568 22 : sp->rowbytes = rowbytes;
569 22 : sp->rowpixels = rowpixels;
570 : /*
571 : * Allocate any additional space required for decoding/encoding.
572 : */
573 43 : needsRefLine = ((sp->groupoptions & GROUP3OPT_2DENCODING) ||
574 21 : td->td_compression == COMPRESSION_CCITTFAX4);
575 :
576 : /*
577 : Assure that allocation computations do not overflow.
578 :
579 : TIFFroundup and TIFFSafeMultiply return zero on integer overflow
580 : */
581 22 : if (dsp->runs != NULL)
582 : {
583 0 : _TIFFfreeExt(tif, dsp->runs);
584 0 : dsp->runs = (uint32_t *)NULL;
585 : }
586 22 : dsp->nruns = TIFFroundup_32(rowpixels + 1, 32);
587 22 : if (needsRefLine)
588 : {
589 18 : dsp->nruns = TIFFSafeMultiply(uint32_t, dsp->nruns, 2);
590 : }
591 22 : if ((dsp->nruns == 0) || (TIFFSafeMultiply(uint32_t, dsp->nruns, 2) == 0))
592 : {
593 0 : TIFFErrorExtR(tif, tif->tif_name,
594 : "Row pixels integer overflow (rowpixels %" PRIu32 ")",
595 : rowpixels);
596 0 : return (0);
597 : }
598 22 : dsp->runs = (uint32_t *)_TIFFCheckMalloc(
599 22 : tif, TIFFSafeMultiply(uint32_t, dsp->nruns, 2), sizeof(uint32_t),
600 : "for Group 3/4 run arrays");
601 22 : if (dsp->runs == NULL)
602 0 : return (0);
603 0 : memset(dsp->runs, 0,
604 22 : TIFFSafeMultiply(uint32_t, dsp->nruns, 2) * sizeof(uint32_t));
605 22 : dsp->curruns = dsp->runs;
606 22 : if (needsRefLine)
607 18 : dsp->refruns = dsp->runs + dsp->nruns;
608 : else
609 4 : dsp->refruns = NULL;
610 22 : if (td->td_compression == COMPRESSION_CCITTFAX3 && is2DEncoding(dsp))
611 : { /* NB: default is 1D routine */
612 1 : tif->tif_decoderow = Fax3Decode2D;
613 1 : tif->tif_decodestrip = Fax3Decode2D;
614 1 : tif->tif_decodetile = Fax3Decode2D;
615 : }
616 :
617 22 : if (needsRefLine)
618 : { /* 2d encoding */
619 18 : Fax3CodecState *esp = EncoderState(tif);
620 : /*
621 : * 2d encoding requires a scanline
622 : * buffer for the ``reference line''; the
623 : * scanline against which delta encoding
624 : * is referenced. The reference line must
625 : * be initialized to be ``white'' (done elsewhere).
626 : */
627 18 : if (esp->refline != NULL)
628 : {
629 0 : _TIFFfreeExt(tif, esp->refline);
630 : }
631 18 : esp->refline = (unsigned char *)_TIFFmallocExt(tif, rowbytes);
632 18 : if (esp->refline == NULL)
633 : {
634 0 : TIFFErrorExtR(tif, module, "No space for Group 3/4 reference line");
635 0 : return (0);
636 : }
637 : }
638 : else /* 1d encoding */
639 4 : EncoderState(tif)->refline = NULL;
640 :
641 22 : return (1);
642 : }
643 :
644 : /*
645 : * CCITT Group 3 FAX Encoding.
646 : */
647 :
648 : #define Fax3FlushBits(tif, sp) \
649 : { \
650 : if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
651 : { \
652 : if (!TIFFFlushData1(tif)) \
653 : return 0; \
654 : } \
655 : *(tif)->tif_rawcp++ = (uint8_t)(sp)->data; \
656 : (tif)->tif_rawcc++; \
657 : (sp)->data = 0, (sp)->bit = 8; \
658 : }
659 : #define _FlushBits(tif) \
660 : { \
661 : if ((tif)->tif_rawcc >= (tif)->tif_rawdatasize) \
662 : { \
663 : if (!TIFFFlushData1(tif)) \
664 : return 0; \
665 : } \
666 : *(tif)->tif_rawcp++ = (uint8_t)data; \
667 : (tif)->tif_rawcc++; \
668 : data = 0, bit = 8; \
669 : }
670 : static const int _msbmask[9] = {0x00, 0x01, 0x03, 0x07, 0x0f,
671 : 0x1f, 0x3f, 0x7f, 0xff};
672 : #define _PutBits(tif, bits, length) \
673 : { \
674 : while (length > bit) \
675 : { \
676 : data |= bits >> (length - bit); \
677 : length -= bit; \
678 : _FlushBits(tif); \
679 : } \
680 : assert(length < 9); \
681 : data |= (bits & _msbmask[length]) << (bit - length); \
682 : bit -= length; \
683 : if (bit == 0) \
684 : _FlushBits(tif); \
685 : }
686 :
687 : /*
688 : * Write a variable-length bit-value to
689 : * the output stream. Values are
690 : * assumed to be at most 16 bits.
691 : */
692 43734 : static int Fax3PutBits(TIFF *tif, unsigned int bits, unsigned int length)
693 : {
694 43734 : Fax3CodecState *sp = EncoderState(tif);
695 43734 : unsigned int bit = sp->bit;
696 43734 : int data = sp->data;
697 :
698 50366 : _PutBits(tif, bits, length);
699 :
700 43734 : sp->data = data;
701 43734 : sp->bit = bit;
702 43734 : return 1;
703 : }
704 :
705 : /*
706 : * Write a code to the output stream.
707 : */
708 : #define putcode(tif, te) Fax3PutBits(tif, (te)->code, (te)->length)
709 :
710 : #ifdef FAX3_DEBUG
711 : #define DEBUG_COLOR(w) (tab == TIFFFaxWhiteCodes ? w "W" : w "B")
712 : #define DEBUG_PRINT(what, len) \
713 : { \
714 : int t; \
715 : printf("%08" PRIX32 "/%-2d: %s%5d\t", data, bit, DEBUG_COLOR(what), \
716 : len); \
717 : for (t = length - 1; t >= 0; t--) \
718 : putchar(code & (1 << t) ? '1' : '0'); \
719 : putchar('\n'); \
720 : }
721 : #endif
722 :
723 : /*
724 : * Write the sequence of codes that describes
725 : * the specified span of zero's or one's. The
726 : * appropriate table that holds the make-up and
727 : * terminating codes is supplied.
728 : */
729 13030 : static int putspan(TIFF *tif, int32_t span, const tableentry *tab)
730 : {
731 13030 : Fax3CodecState *sp = EncoderState(tif);
732 13030 : unsigned int bit = sp->bit;
733 13030 : int data = sp->data;
734 : unsigned int code, length;
735 :
736 13030 : while (span >= 2624)
737 : {
738 0 : const tableentry *te = &tab[63 + (2560 >> 6)];
739 0 : code = te->code;
740 0 : length = te->length;
741 : #ifdef FAX3_DEBUG
742 : DEBUG_PRINT("MakeUp", te->runlen);
743 : #endif
744 0 : _PutBits(tif, code, length);
745 0 : span -= te->runlen;
746 : }
747 13030 : if (span >= 64)
748 : {
749 418 : const tableentry *te = &tab[63 + (span >> 6)];
750 418 : assert(te->runlen == 64 * (span >> 6));
751 418 : code = te->code;
752 418 : length = te->length;
753 : #ifdef FAX3_DEBUG
754 : DEBUG_PRINT("MakeUp", te->runlen);
755 : #endif
756 969 : _PutBits(tif, code, length);
757 418 : span -= te->runlen;
758 : }
759 13030 : code = tab[span].code;
760 13030 : length = tab[span].length;
761 : #ifdef FAX3_DEBUG
762 : DEBUG_PRINT(" Term", tab[span].runlen);
763 : #endif
764 19233 : _PutBits(tif, code, length);
765 :
766 13030 : sp->data = data;
767 13030 : sp->bit = bit;
768 :
769 13030 : return 1;
770 : }
771 :
772 : /*
773 : * Write an EOL code to the output stream. The zero-fill
774 : * logic for byte-aligning encoded scanlines is handled
775 : * here. We also handle writing the tag bit for the next
776 : * scanline when doing 2d encoding.
777 : */
778 99 : static int Fax3PutEOL(TIFF *tif)
779 : {
780 99 : Fax3CodecState *sp = EncoderState(tif);
781 99 : unsigned int bit = sp->bit;
782 99 : int data = sp->data;
783 : unsigned int code, length, tparm;
784 :
785 99 : if (sp->b.groupoptions & GROUP3OPT_FILLBITS)
786 : {
787 : /*
788 : * Force bit alignment so EOL will terminate on
789 : * a byte boundary. That is, force the bit alignment
790 : * to 16-12 = 4 before putting out the EOL code.
791 : */
792 0 : int align = 8 - 4;
793 0 : if (align != sp->bit)
794 : {
795 0 : if (align > sp->bit)
796 0 : align = sp->bit + (8 - align);
797 : else
798 0 : align = sp->bit - align;
799 0 : tparm = align;
800 0 : _PutBits(tif, 0, tparm);
801 : }
802 : }
803 99 : code = EOL;
804 99 : length = 12;
805 99 : if (is2DEncoding(sp))
806 : {
807 0 : code = (code << 1) | (sp->tag == G3_1D);
808 0 : length++;
809 : }
810 242 : _PutBits(tif, code, length);
811 :
812 99 : sp->data = data;
813 99 : sp->bit = bit;
814 :
815 99 : return 1;
816 : }
817 :
818 : /*
819 : * Reset encoding state at the start of a strip.
820 : */
821 9 : static int Fax3PreEncode(TIFF *tif, uint16_t s)
822 : {
823 9 : Fax3CodecState *sp = EncoderState(tif);
824 :
825 : (void)s;
826 9 : assert(sp != NULL);
827 9 : sp->bit = 8;
828 9 : sp->data = 0;
829 9 : sp->tag = G3_1D;
830 : /*
831 : * This is necessary for Group 4; otherwise it isn't
832 : * needed because the first scanline of each strip ends
833 : * up being copied into the refline.
834 : */
835 9 : if (sp->refline)
836 7 : _TIFFmemset(sp->refline, 0x00, sp->b.rowbytes);
837 9 : if (is2DEncoding(sp))
838 : {
839 0 : float res = tif->tif_dir.td_yresolution;
840 : /*
841 : * The CCITT spec says that when doing 2d encoding, you
842 : * should only do it on K consecutive scanlines, where K
843 : * depends on the resolution of the image being encoded
844 : * (2 for <= 200 lpi, 4 for > 200 lpi). Since the directory
845 : * code initializes td_yresolution to 0, this code will
846 : * select a K of 2 unless the YResolution tag is set
847 : * appropriately. (Note also that we fudge a little here
848 : * and use 150 lpi to avoid problems with units conversion.)
849 : */
850 0 : if (tif->tif_dir.td_resolutionunit == RESUNIT_CENTIMETER)
851 0 : res *= 2.54f; /* convert to inches */
852 0 : sp->maxk = (res > 150 ? 4 : 2);
853 0 : sp->k = sp->maxk - 1;
854 : }
855 : else
856 9 : sp->k = sp->maxk = 0;
857 9 : sp->line = 0;
858 9 : return (1);
859 : }
860 :
861 : static const unsigned char zeroruns[256] = {
862 : 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, /* 0x00 - 0x0f */
863 : 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0x10 - 0x1f */
864 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x20 - 0x2f */
865 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0x30 - 0x3f */
866 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 - 0x4f */
867 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x50 - 0x5f */
868 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 - 0x6f */
869 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x70 - 0x7f */
870 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x80 - 0x8f */
871 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x90 - 0x9f */
872 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 - 0xaf */
873 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 - 0xbf */
874 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 - 0xcf */
875 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 - 0xdf */
876 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 - 0xef */
877 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 - 0xff */
878 : };
879 : static const unsigned char oneruns[256] = {
880 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 - 0x0f */
881 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x10 - 0x1f */
882 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 - 0x2f */
883 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x30 - 0x3f */
884 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x40 - 0x4f */
885 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x50 - 0x5f */
886 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x60 - 0x6f */
887 : 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x70 - 0x7f */
888 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x80 - 0x8f */
889 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 - 0x9f */
890 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xa0 - 0xaf */
891 : 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0xb0 - 0xbf */
892 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xc0 - 0xcf */
893 : 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, /* 0xd0 - 0xdf */
894 : 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, /* 0xe0 - 0xef */
895 : 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8, /* 0xf0 - 0xff */
896 : };
897 :
898 : /*
899 : * Find a span of ones or zeros using the supplied
900 : * table. The ``base'' of the bit string is supplied
901 : * along with the start+end bit indices.
902 : */
903 69633 : static inline int32_t find0span(unsigned char *bp, int32_t bs, int32_t be)
904 : {
905 69633 : int32_t bits = be - bs;
906 : int32_t n, span;
907 :
908 69633 : bp += bs >> 3;
909 : /*
910 : * Check partial byte on lhs.
911 : */
912 69633 : if (bits > 0 && (n = (bs & 7)) != 0)
913 : {
914 53657 : span = zeroruns[(*bp << n) & 0xff];
915 53657 : if (span > 8 - n) /* table value too generous */
916 29826 : span = 8 - n;
917 53657 : if (span > bits) /* constrain span to bit range */
918 359 : span = bits;
919 53657 : if (n + span < 8) /* doesn't extend to edge of byte */
920 24190 : return (span);
921 29467 : bits -= span;
922 29467 : bp++;
923 : }
924 : else
925 15976 : span = 0;
926 45443 : if (bits >= (int32_t)(2 * 8 * sizeof(int64_t)))
927 : {
928 : int64_t *lp;
929 : /*
930 : * Align to int64_t boundary and check int64_t words.
931 : */
932 54272 : while (!isAligned(bp, int64_t))
933 : {
934 38361 : if (*bp != 0x00)
935 15909 : return (span + zeroruns[*bp]);
936 22452 : span += 8;
937 22452 : bits -= 8;
938 22452 : bp++;
939 : }
940 15911 : lp = (int64_t *)bp;
941 17290 : while ((bits >= (int32_t)(8 * sizeof(int64_t))) && (0 == *lp))
942 : {
943 1379 : span += 8 * sizeof(int64_t);
944 1379 : bits -= 8 * sizeof(int64_t);
945 1379 : lp++;
946 : }
947 15911 : bp = (unsigned char *)lp;
948 : }
949 : /*
950 : * Scan full bytes for all 0's.
951 : */
952 50893 : while (bits >= 8)
953 : {
954 48775 : if (*bp != 0x00) /* end of run */
955 27416 : return (span + zeroruns[*bp]);
956 21359 : span += 8;
957 21359 : bits -= 8;
958 21359 : bp++;
959 : }
960 : /*
961 : * Check partial byte on rhs.
962 : */
963 2118 : if (bits > 0)
964 : {
965 2002 : n = zeroruns[*bp];
966 2002 : span += (n > bits ? bits : n);
967 : }
968 2118 : return (span);
969 : }
970 :
971 83357 : static inline int32_t find1span(unsigned char *bp, int32_t bs, int32_t be)
972 : {
973 83357 : int32_t bits = be - bs;
974 : int32_t n, span;
975 :
976 83357 : bp += bs >> 3;
977 : /*
978 : * Check partial byte on lhs.
979 : */
980 83357 : if (bits > 0 && (n = (bs & 7)) != 0)
981 : {
982 53819 : span = oneruns[(*bp << n) & 0xff];
983 53819 : if (span > 8 - n) /* table value too generous */
984 0 : span = 8 - n;
985 53819 : if (span > bits) /* constrain span to bit range */
986 0 : span = bits;
987 53819 : if (n + span < 8) /* doesn't extend to edge of byte */
988 24458 : return (span);
989 29361 : bits -= span;
990 29361 : bp++;
991 : }
992 : else
993 29538 : span = 0;
994 58899 : if (bits >= (int32_t)(2 * 8 * sizeof(int64_t)))
995 : {
996 : int64_t *lp;
997 : /*
998 : * Align to int64_t boundary and check int64_t words.
999 : */
1000 94760 : while (!isAligned(bp, int64_t))
1001 : {
1002 61078 : if (*bp != 0xff)
1003 11996 : return (span + oneruns[*bp]);
1004 49082 : span += 8;
1005 49082 : bits -= 8;
1006 49082 : bp++;
1007 : }
1008 33682 : lp = (int64_t *)bp;
1009 338421 : while ((bits >= (int32_t)(8 * sizeof(int64_t))) &&
1010 317978 : (~((uint64_t)0) == (uint64_t)*lp))
1011 : {
1012 304739 : span += 8 * sizeof(int64_t);
1013 304739 : bits -= 8 * sizeof(int64_t);
1014 304739 : lp++;
1015 : }
1016 33682 : bp = (unsigned char *)lp;
1017 : }
1018 : /*
1019 : * Scan full bytes for all 1's.
1020 : */
1021 206691 : while (bits >= 8)
1022 : {
1023 184031 : if (*bp != 0xff) /* end of run */
1024 24243 : return (span + oneruns[*bp]);
1025 159788 : span += 8;
1026 159788 : bits -= 8;
1027 159788 : bp++;
1028 : }
1029 : /*
1030 : * Check partial byte on rhs.
1031 : */
1032 22660 : if (bits > 0)
1033 : {
1034 888 : n = oneruns[*bp];
1035 888 : span += (n > bits ? bits : n);
1036 : }
1037 22660 : return (span);
1038 : }
1039 :
1040 : /*
1041 : * Return the offset of the next bit in the range
1042 : * [bs..be] that is different from the specified
1043 : * color. The end, be, is returned if no such bit
1044 : * exists.
1045 : */
1046 : #define finddiff(_cp, _bs, _be, _color) \
1047 : (_bs + (_color ? find1span(_cp, _bs, _be) : find0span(_cp, _bs, _be)))
1048 : /*
1049 : * Like finddiff, but also check the starting bit
1050 : * against the end in case start > end.
1051 : */
1052 : #define finddiff2(_cp, _bs, _be, _color) \
1053 : (_bs < _be ? finddiff(_cp, _bs, _be, _color) : _be)
1054 :
1055 : /*
1056 : * 1d-encode a row of pixels. The encoding is
1057 : * a sequence of all-white or all-black spans
1058 : * of pixels encoded with Huffman codes.
1059 : */
1060 198 : static int Fax3Encode1DRow(TIFF *tif, unsigned char *bp, uint32_t bits)
1061 : {
1062 198 : Fax3CodecState *sp = EncoderState(tif);
1063 : int32_t span;
1064 198 : uint32_t bs = 0;
1065 :
1066 : for (;;)
1067 : {
1068 2646 : span = find0span(bp, bs, bits); /* white span */
1069 2646 : if (!putspan(tif, span, TIFFFaxWhiteCodes))
1070 0 : return 0;
1071 2646 : bs += span;
1072 2646 : if (bs >= bits)
1073 52 : break;
1074 2594 : span = find1span(bp, bs, bits); /* black span */
1075 2594 : if (!putspan(tif, span, TIFFFaxBlackCodes))
1076 0 : return 0;
1077 2594 : bs += span;
1078 2594 : if (bs >= bits)
1079 146 : break;
1080 : }
1081 198 : if (sp->b.mode & (FAXMODE_BYTEALIGN | FAXMODE_WORDALIGN))
1082 : {
1083 99 : if (sp->bit != 8) /* byte-align */
1084 89 : Fax3FlushBits(tif, sp);
1085 99 : if ((sp->b.mode & FAXMODE_WORDALIGN) &&
1086 0 : !isAligned(tif->tif_rawcp, uint16_t))
1087 0 : Fax3FlushBits(tif, sp);
1088 : }
1089 198 : return (1);
1090 : }
1091 :
1092 : static const tableentry horizcode = {3, 0x1, 0}; /* 001 */
1093 : static const tableentry passcode = {4, 0x1, 0}; /* 0001 */
1094 : static const tableentry vcodes[7] = {
1095 : {7, 0x03, 0}, /* 0000 011 */
1096 : {6, 0x03, 0}, /* 0000 11 */
1097 : {3, 0x03, 0}, /* 011 */
1098 : {1, 0x1, 0}, /* 1 */
1099 : {3, 0x2, 0}, /* 010 */
1100 : {6, 0x02, 0}, /* 0000 10 */
1101 : {7, 0x02, 0} /* 0000 010 */
1102 : };
1103 :
1104 : /*
1105 : * 2d-encode a row of pixels. Consult the CCITT
1106 : * documentation for the algorithm.
1107 : */
1108 7897 : static int Fax3Encode2DRow(TIFF *tif, unsigned char *bp, unsigned char *rp,
1109 : uint32_t bits)
1110 : {
1111 : #define PIXEL(buf, ix) ((((buf)[(ix) >> 3]) >> (7 - ((ix)&7))) & 1)
1112 7897 : uint32_t a0 = 0;
1113 7897 : uint32_t a1 = (PIXEL(bp, 0) != 0 ? 0 : finddiff(bp, 0, bits, 0));
1114 7897 : uint32_t b1 = (PIXEL(rp, 0) != 0 ? 0 : finddiff(rp, 0, bits, 0));
1115 : uint32_t a2, b2;
1116 :
1117 : for (;;)
1118 : {
1119 43720 : b2 = finddiff2(rp, b1, bits, PIXEL(rp, b1));
1120 43720 : if (b2 >= a1)
1121 : {
1122 : /* Naive computation triggers
1123 : * -fsanitize=undefined,unsigned-integer-overflow */
1124 : /* although it is correct unless the difference between both is < 31
1125 : * bit */
1126 : /* int32_t d = b1 - a1; */
1127 36175 : int32_t d = (b1 >= a1 && b1 - a1 <= 3U) ? (int32_t)(b1 - a1)
1128 86693 : : (b1 < a1 && a1 - b1 <= 3U) ? -(int32_t)(a1 - b1)
1129 13042 : : 0x7FFFFFFF;
1130 40956 : if (!(-3 <= d && d <= 3))
1131 : { /* horizontal mode */
1132 3895 : a2 = finddiff2(bp, a1, bits, PIXEL(bp, a1));
1133 3895 : if (!putcode(tif, &horizcode))
1134 0 : return 0;
1135 3895 : if (a0 + a1 == 0 || PIXEL(bp, a0) == 0)
1136 : {
1137 1950 : if (!putspan(tif, a1 - a0, TIFFFaxWhiteCodes))
1138 0 : return 0;
1139 1950 : if (!putspan(tif, a2 - a1, TIFFFaxBlackCodes))
1140 0 : return 0;
1141 : }
1142 : else
1143 : {
1144 1945 : if (!putspan(tif, a1 - a0, TIFFFaxBlackCodes))
1145 0 : return 0;
1146 1945 : if (!putspan(tif, a2 - a1, TIFFFaxWhiteCodes))
1147 0 : return 0;
1148 : }
1149 3895 : a0 = a2;
1150 : }
1151 : else
1152 : { /* vertical mode */
1153 37061 : if (!putcode(tif, &vcodes[d + 3]))
1154 0 : return 0;
1155 37061 : a0 = a1;
1156 : }
1157 : }
1158 : else
1159 : { /* pass mode */
1160 2764 : if (!putcode(tif, &passcode))
1161 0 : return 0;
1162 2764 : a0 = b2;
1163 : }
1164 43720 : if (a0 >= bits)
1165 7897 : break;
1166 35823 : a1 = finddiff(bp, a0, bits, PIXEL(bp, a0));
1167 35823 : b1 = finddiff(rp, a0, bits, !PIXEL(bp, a0));
1168 35823 : b1 = finddiff(rp, b1, bits, PIXEL(bp, a0));
1169 : }
1170 7897 : return (1);
1171 : #undef PIXEL
1172 : }
1173 :
1174 : /*
1175 : * Encode a buffer of pixels.
1176 : */
1177 2 : static int Fax3Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
1178 : {
1179 : static const char module[] = "Fax3Encode";
1180 2 : Fax3CodecState *sp = EncoderState(tif);
1181 : (void)s;
1182 2 : if (cc % sp->b.rowbytes)
1183 : {
1184 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be written");
1185 0 : return (0);
1186 : }
1187 200 : while (cc > 0)
1188 : {
1189 198 : if ((sp->b.mode & FAXMODE_NOEOL) == 0)
1190 : {
1191 99 : if (!Fax3PutEOL(tif))
1192 0 : return 0;
1193 : }
1194 198 : if (is2DEncoding(sp))
1195 : {
1196 0 : if (sp->tag == G3_1D)
1197 : {
1198 0 : if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1199 0 : return (0);
1200 0 : sp->tag = G3_2D;
1201 : }
1202 : else
1203 : {
1204 0 : if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1205 0 : return (0);
1206 0 : sp->k--;
1207 : }
1208 0 : if (sp->k == 0)
1209 : {
1210 0 : sp->tag = G3_1D;
1211 0 : sp->k = sp->maxk - 1;
1212 : }
1213 : else
1214 0 : _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1215 : }
1216 : else
1217 : {
1218 198 : if (!Fax3Encode1DRow(tif, bp, sp->b.rowpixels))
1219 0 : return (0);
1220 : }
1221 198 : bp += sp->b.rowbytes;
1222 198 : cc -= sp->b.rowbytes;
1223 : }
1224 2 : return (1);
1225 : }
1226 :
1227 2 : static int Fax3PostEncode(TIFF *tif)
1228 : {
1229 2 : Fax3CodecState *sp = EncoderState(tif);
1230 :
1231 2 : if (sp->bit != 8)
1232 1 : Fax3FlushBits(tif, sp);
1233 2 : return (1);
1234 : }
1235 :
1236 17 : static int _Fax3Close(TIFF *tif)
1237 : {
1238 17 : if ((Fax3State(tif)->mode & FAXMODE_NORTC) == 0 && tif->tif_rawcp)
1239 : {
1240 0 : Fax3CodecState *sp = EncoderState(tif);
1241 0 : unsigned int code = EOL;
1242 0 : unsigned int length = 12;
1243 : int i;
1244 :
1245 0 : if (is2DEncoding(sp))
1246 : {
1247 0 : code = (code << 1) | (sp->tag == G3_1D);
1248 0 : length++;
1249 : }
1250 0 : for (i = 0; i < 6; i++)
1251 0 : Fax3PutBits(tif, code, length);
1252 0 : Fax3FlushBits(tif, sp);
1253 : }
1254 17 : return 1;
1255 : }
1256 :
1257 17 : static void Fax3Close(TIFF *tif) { _Fax3Close(tif); }
1258 :
1259 70 : static void Fax3Cleanup(TIFF *tif)
1260 : {
1261 70 : Fax3CodecState *sp = DecoderState(tif);
1262 :
1263 70 : assert(sp != 0);
1264 :
1265 70 : tif->tif_tagmethods.vgetfield = sp->b.vgetparent;
1266 70 : tif->tif_tagmethods.vsetfield = sp->b.vsetparent;
1267 70 : tif->tif_tagmethods.printdir = sp->b.printdir;
1268 :
1269 70 : if (sp->runs)
1270 22 : _TIFFfreeExt(tif, sp->runs);
1271 70 : if (sp->refline)
1272 18 : _TIFFfreeExt(tif, sp->refline);
1273 :
1274 70 : _TIFFfreeExt(tif, tif->tif_data);
1275 70 : tif->tif_data = NULL;
1276 :
1277 70 : _TIFFSetDefaultCompressionState(tif);
1278 70 : }
1279 :
1280 : #define FIELD_BADFAXLINES (FIELD_CODEC + 0)
1281 : #define FIELD_CLEANFAXDATA (FIELD_CODEC + 1)
1282 : #define FIELD_BADFAXRUN (FIELD_CODEC + 2)
1283 :
1284 : #define FIELD_OPTIONS (FIELD_CODEC + 7)
1285 :
1286 : static const TIFFField faxFields[] = {
1287 : {TIFFTAG_FAXMODE, 0, 0, TIFF_ANY, 0, TIFF_SETGET_INT, FIELD_PSEUDO, FALSE,
1288 : FALSE, "FaxMode", NULL},
1289 : {TIFFTAG_FAXFILLFUNC, 0, 0, TIFF_ANY, 0, TIFF_SETGET_OTHER, FIELD_PSEUDO,
1290 : FALSE, FALSE, "FaxFillFunc", NULL},
1291 : {TIFFTAG_BADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32,
1292 : FIELD_BADFAXLINES, TRUE, FALSE, "BadFaxLines", NULL},
1293 : {TIFFTAG_CLEANFAXDATA, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16,
1294 : FIELD_CLEANFAXDATA, TRUE, FALSE, "CleanFaxData", NULL},
1295 : {TIFFTAG_CONSECUTIVEBADFAXLINES, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32,
1296 : FIELD_BADFAXRUN, TRUE, FALSE, "ConsecutiveBadFaxLines", NULL}};
1297 : static const TIFFField fax3Fields[] = {
1298 : {TIFFTAG_GROUP3OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32,
1299 : FIELD_OPTIONS, FALSE, FALSE, "Group3Options", NULL},
1300 : };
1301 : static const TIFFField fax4Fields[] = {
1302 : {TIFFTAG_GROUP4OPTIONS, 1, 1, TIFF_LONG, 0, TIFF_SETGET_UINT32,
1303 : FIELD_OPTIONS, FALSE, FALSE, "Group4Options", NULL},
1304 : };
1305 :
1306 616 : static int Fax3VSetField(TIFF *tif, uint32_t tag, va_list ap)
1307 : {
1308 616 : Fax3BaseState *sp = Fax3State(tif);
1309 : const TIFFField *fip;
1310 :
1311 616 : assert(sp != 0);
1312 616 : assert(sp->vsetparent != 0);
1313 :
1314 616 : switch (tag)
1315 : {
1316 70 : case TIFFTAG_FAXMODE:
1317 70 : sp->mode = (int)va_arg(ap, int);
1318 70 : return 1; /* NB: pseudo tag */
1319 70 : case TIFFTAG_FAXFILLFUNC:
1320 70 : DecoderState(tif)->fill = va_arg(ap, TIFFFaxFillFunc);
1321 70 : return 1; /* NB: pseudo tag */
1322 2 : case TIFFTAG_GROUP3OPTIONS:
1323 : /* XXX: avoid reading options if compression mismatches. */
1324 2 : if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX3)
1325 2 : sp->groupoptions = (uint32_t)va_arg(ap, uint32_t);
1326 2 : break;
1327 0 : case TIFFTAG_GROUP4OPTIONS:
1328 : /* XXX: avoid reading options if compression mismatches. */
1329 0 : if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1330 0 : sp->groupoptions = (uint32_t)va_arg(ap, uint32_t);
1331 0 : break;
1332 0 : case TIFFTAG_BADFAXLINES:
1333 0 : sp->badfaxlines = (uint32_t)va_arg(ap, uint32_t);
1334 0 : break;
1335 0 : case TIFFTAG_CLEANFAXDATA:
1336 0 : sp->cleanfaxdata = (uint16_t)va_arg(ap, uint16_vap);
1337 0 : break;
1338 0 : case TIFFTAG_CONSECUTIVEBADFAXLINES:
1339 0 : sp->badfaxrun = (uint32_t)va_arg(ap, uint32_t);
1340 0 : break;
1341 474 : default:
1342 474 : return (*sp->vsetparent)(tif, tag, ap);
1343 : }
1344 :
1345 2 : if ((fip = TIFFFieldWithTag(tif, tag)) != NULL)
1346 2 : TIFFSetFieldBit(tif, fip->field_bit);
1347 : else
1348 0 : return 0;
1349 :
1350 2 : tif->tif_flags |= TIFF_DIRTYDIRECT;
1351 2 : return 1;
1352 : }
1353 :
1354 741 : static int Fax3VGetField(TIFF *tif, uint32_t tag, va_list ap)
1355 : {
1356 741 : Fax3BaseState *sp = Fax3State(tif);
1357 :
1358 741 : assert(sp != 0);
1359 :
1360 741 : switch (tag)
1361 : {
1362 0 : case TIFFTAG_FAXMODE:
1363 0 : *va_arg(ap, int *) = sp->mode;
1364 0 : break;
1365 0 : case TIFFTAG_FAXFILLFUNC:
1366 0 : *va_arg(ap, TIFFFaxFillFunc *) = DecoderState(tif)->fill;
1367 0 : break;
1368 2 : case TIFFTAG_GROUP3OPTIONS:
1369 : case TIFFTAG_GROUP4OPTIONS:
1370 2 : *va_arg(ap, uint32_t *) = sp->groupoptions;
1371 2 : break;
1372 0 : case TIFFTAG_BADFAXLINES:
1373 0 : *va_arg(ap, uint32_t *) = sp->badfaxlines;
1374 0 : break;
1375 0 : case TIFFTAG_CLEANFAXDATA:
1376 0 : *va_arg(ap, uint16_t *) = sp->cleanfaxdata;
1377 0 : break;
1378 0 : case TIFFTAG_CONSECUTIVEBADFAXLINES:
1379 0 : *va_arg(ap, uint32_t *) = sp->badfaxrun;
1380 0 : break;
1381 739 : default:
1382 739 : return (*sp->vgetparent)(tif, tag, ap);
1383 : }
1384 2 : return (1);
1385 : }
1386 :
1387 0 : static void Fax3PrintDir(TIFF *tif, FILE *fd, long flags)
1388 : {
1389 0 : Fax3BaseState *sp = Fax3State(tif);
1390 :
1391 0 : assert(sp != 0);
1392 :
1393 : (void)flags;
1394 0 : if (TIFFFieldSet(tif, FIELD_OPTIONS))
1395 : {
1396 0 : const char *sep = " ";
1397 0 : if (tif->tif_dir.td_compression == COMPRESSION_CCITTFAX4)
1398 : {
1399 0 : fprintf(fd, " Group 4 Options:");
1400 0 : if (sp->groupoptions & GROUP4OPT_UNCOMPRESSED)
1401 0 : fprintf(fd, "%suncompressed data", sep);
1402 : }
1403 : else
1404 : {
1405 :
1406 0 : fprintf(fd, " Group 3 Options:");
1407 0 : if (sp->groupoptions & GROUP3OPT_2DENCODING)
1408 : {
1409 0 : fprintf(fd, "%s2-d encoding", sep);
1410 0 : sep = "+";
1411 : }
1412 0 : if (sp->groupoptions & GROUP3OPT_FILLBITS)
1413 : {
1414 0 : fprintf(fd, "%sEOL padding", sep);
1415 0 : sep = "+";
1416 : }
1417 0 : if (sp->groupoptions & GROUP3OPT_UNCOMPRESSED)
1418 0 : fprintf(fd, "%suncompressed data", sep);
1419 : }
1420 0 : fprintf(fd, " (%" PRIu32 " = 0x%" PRIx32 ")\n", sp->groupoptions,
1421 : sp->groupoptions);
1422 : }
1423 0 : if (TIFFFieldSet(tif, FIELD_CLEANFAXDATA))
1424 : {
1425 0 : fprintf(fd, " Fax Data:");
1426 0 : switch (sp->cleanfaxdata)
1427 : {
1428 0 : case CLEANFAXDATA_CLEAN:
1429 0 : fprintf(fd, " clean");
1430 0 : break;
1431 0 : case CLEANFAXDATA_REGENERATED:
1432 0 : fprintf(fd, " receiver regenerated");
1433 0 : break;
1434 0 : case CLEANFAXDATA_UNCLEAN:
1435 0 : fprintf(fd, " uncorrected errors");
1436 0 : break;
1437 : }
1438 0 : fprintf(fd, " (%" PRIu16 " = 0x%" PRIx16 ")\n", sp->cleanfaxdata,
1439 0 : sp->cleanfaxdata);
1440 : }
1441 0 : if (TIFFFieldSet(tif, FIELD_BADFAXLINES))
1442 0 : fprintf(fd, " Bad Fax Lines: %" PRIu32 "\n", sp->badfaxlines);
1443 0 : if (TIFFFieldSet(tif, FIELD_BADFAXRUN))
1444 0 : fprintf(fd, " Consecutive Bad Fax Lines: %" PRIu32 "\n",
1445 : sp->badfaxrun);
1446 0 : if (sp->printdir)
1447 0 : (*sp->printdir)(tif, fd, flags);
1448 0 : }
1449 :
1450 70 : static int InitCCITTFax3(TIFF *tif)
1451 : {
1452 : static const char module[] = "InitCCITTFax3";
1453 : Fax3BaseState *sp;
1454 :
1455 : /*
1456 : * Merge codec-specific tag information.
1457 : */
1458 70 : if (!_TIFFMergeFields(tif, faxFields, TIFFArrayCount(faxFields)))
1459 : {
1460 0 : TIFFErrorExtR(tif, "InitCCITTFax3",
1461 : "Merging common CCITT Fax codec-specific tags failed");
1462 0 : return 0;
1463 : }
1464 :
1465 : /*
1466 : * Allocate state block so tag methods have storage to record values.
1467 : */
1468 70 : tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(Fax3CodecState));
1469 :
1470 70 : if (tif->tif_data == NULL)
1471 : {
1472 0 : TIFFErrorExtR(tif, module, "No space for state block");
1473 0 : return (0);
1474 : }
1475 70 : _TIFFmemset(tif->tif_data, 0, sizeof(Fax3CodecState));
1476 :
1477 70 : sp = Fax3State(tif);
1478 70 : sp->rw_mode = tif->tif_mode;
1479 :
1480 : /*
1481 : * Override parent get/set field methods.
1482 : */
1483 70 : sp->vgetparent = tif->tif_tagmethods.vgetfield;
1484 70 : tif->tif_tagmethods.vgetfield = Fax3VGetField; /* hook for codec tags */
1485 70 : sp->vsetparent = tif->tif_tagmethods.vsetfield;
1486 70 : tif->tif_tagmethods.vsetfield = Fax3VSetField; /* hook for codec tags */
1487 70 : sp->printdir = tif->tif_tagmethods.printdir;
1488 70 : tif->tif_tagmethods.printdir = Fax3PrintDir; /* hook for codec tags */
1489 70 : sp->groupoptions = 0;
1490 :
1491 70 : if (sp->rw_mode == O_RDONLY) /* FIXME: improve for in place update */
1492 25 : tif->tif_flags |= TIFF_NOBITREV; /* decoder does bit reversal */
1493 70 : DecoderState(tif)->runs = NULL;
1494 70 : TIFFSetField(tif, TIFFTAG_FAXFILLFUNC, _TIFFFax3fillruns);
1495 70 : EncoderState(tif)->refline = NULL;
1496 :
1497 : /*
1498 : * Install codec methods.
1499 : */
1500 70 : tif->tif_fixuptags = Fax3FixupTags;
1501 70 : tif->tif_setupdecode = Fax3SetupState;
1502 70 : tif->tif_predecode = Fax3PreDecode;
1503 70 : tif->tif_decoderow = Fax3Decode1D;
1504 70 : tif->tif_decodestrip = Fax3Decode1D;
1505 70 : tif->tif_decodetile = Fax3Decode1D;
1506 70 : tif->tif_setupencode = Fax3SetupState;
1507 70 : tif->tif_preencode = Fax3PreEncode;
1508 70 : tif->tif_postencode = Fax3PostEncode;
1509 70 : tif->tif_encoderow = Fax3Encode;
1510 70 : tif->tif_encodestrip = Fax3Encode;
1511 70 : tif->tif_encodetile = Fax3Encode;
1512 70 : tif->tif_close = Fax3Close;
1513 70 : tif->tif_cleanup = Fax3Cleanup;
1514 :
1515 70 : return (1);
1516 : }
1517 :
1518 9 : int TIFFInitCCITTFax3(TIFF *tif, int scheme)
1519 : {
1520 : (void)scheme;
1521 9 : if (InitCCITTFax3(tif))
1522 : {
1523 : /*
1524 : * Merge codec-specific tag information.
1525 : */
1526 9 : if (!_TIFFMergeFields(tif, fax3Fields, TIFFArrayCount(fax3Fields)))
1527 : {
1528 0 : TIFFErrorExtR(tif, "TIFFInitCCITTFax3",
1529 : "Merging CCITT Fax 3 codec-specific tags failed");
1530 0 : return 0;
1531 : }
1532 :
1533 : /*
1534 : * The default format is Class/F-style w/o RTC.
1535 : */
1536 9 : return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_CLASSF);
1537 : }
1538 : else
1539 0 : return 01;
1540 : }
1541 :
1542 : /*
1543 : * CCITT Group 4 (T.6) Facsimile-compatible
1544 : * Compression Scheme Support.
1545 : */
1546 :
1547 : #define SWAP(t, a, b) \
1548 : { \
1549 : t x; \
1550 : x = (a); \
1551 : (a) = (b); \
1552 : (b) = x; \
1553 : }
1554 : /*
1555 : * Decode the requested amount of G4-encoded data.
1556 : */
1557 21607 : static int Fax4Decode(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s)
1558 : {
1559 21607 : DECLARE_STATE_2D(tif, sp, "Fax4Decode");
1560 : (void)s;
1561 21607 : if (occ % sp->b.rowbytes)
1562 : {
1563 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read");
1564 0 : return (-1);
1565 : }
1566 21607 : if (sp->eofReachedCount >= EOF_REACHED_COUNT_THRESHOLD)
1567 : {
1568 0 : TIFFErrorExtR(
1569 : tif, module,
1570 : "End of file has already been reached %d times within that strip",
1571 : sp->eofReachedCount);
1572 0 : return (-1);
1573 : }
1574 21607 : CACHE_STATE(tif, sp);
1575 21607 : int start = sp->line;
1576 44302 : while (occ > 0)
1577 : {
1578 22695 : a0 = 0;
1579 22695 : RunLength = 0;
1580 22695 : pa = thisrun = sp->curruns;
1581 22695 : pb = sp->refruns;
1582 22695 : b1 = *pb++;
1583 : #ifdef FAX3_DEBUG
1584 : printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail);
1585 : printf("-------------------- %d\n", tif->tif_row);
1586 : fflush(stdout);
1587 : #endif
1588 151277 : EXPAND2D(EOFG4);
1589 22695 : if (EOLcnt)
1590 0 : goto EOFG4;
1591 22695 : if (((lastx + 7) >> 3) > (int)occ) /* check for buffer overrun */
1592 : {
1593 0 : TIFFErrorExtR(tif, module,
1594 : "Buffer overrun detected : %" TIFF_SSIZE_FORMAT
1595 : " bytes available, %d bits needed",
1596 : occ, lastx);
1597 0 : return -1;
1598 : }
1599 22695 : (*sp->fill)(buf, thisrun, pa, lastx);
1600 22695 : SETVALUE(0); /* imaginary change for reference */
1601 22695 : SWAP(uint32_t *, sp->curruns, sp->refruns);
1602 22695 : buf += sp->b.rowbytes;
1603 22695 : occ -= sp->b.rowbytes;
1604 22695 : sp->line++;
1605 22695 : continue;
1606 0 : EOFG4:
1607 0 : NeedBits16(13, BADG4);
1608 0 : BADG4:
1609 : #ifdef FAX3_DEBUG
1610 : if (GetBits(13) != 0x1001)
1611 : fputs("Bad EOFB\n", stderr);
1612 : #endif
1613 0 : ClrBits(13);
1614 0 : if (((lastx + 7) >> 3) > (int)occ) /* check for buffer overrun */
1615 : {
1616 0 : TIFFErrorExtR(tif, module,
1617 : "Buffer overrun detected : %" TIFF_SSIZE_FORMAT
1618 : " bytes available, %d bits needed",
1619 : occ, lastx);
1620 0 : return -1;
1621 : }
1622 0 : (*sp->fill)(buf, thisrun, pa, lastx);
1623 0 : UNCACHE_STATE(tif, sp);
1624 0 : return (sp->line != start
1625 : ? 1
1626 0 : : -1); /* don't error on badly-terminated strips */
1627 : }
1628 21607 : UNCACHE_STATE(tif, sp);
1629 21607 : return (1);
1630 : }
1631 : #undef SWAP
1632 :
1633 : /*
1634 : * Encode the requested amount of data.
1635 : */
1636 7206 : static int Fax4Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
1637 : {
1638 : static const char module[] = "Fax4Encode";
1639 7206 : Fax3CodecState *sp = EncoderState(tif);
1640 : (void)s;
1641 7206 : if (cc % sp->b.rowbytes)
1642 : {
1643 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be written");
1644 0 : return (0);
1645 : }
1646 15103 : while (cc > 0)
1647 : {
1648 7897 : if (!Fax3Encode2DRow(tif, bp, sp->refline, sp->b.rowpixels))
1649 0 : return (0);
1650 7897 : _TIFFmemcpy(sp->refline, bp, sp->b.rowbytes);
1651 7897 : bp += sp->b.rowbytes;
1652 7897 : cc -= sp->b.rowbytes;
1653 : }
1654 7206 : return (1);
1655 : }
1656 :
1657 7 : static int Fax4PostEncode(TIFF *tif)
1658 : {
1659 7 : Fax3CodecState *sp = EncoderState(tif);
1660 :
1661 : /* terminate strip w/ EOFB */
1662 7 : Fax3PutBits(tif, EOL, 12);
1663 7 : Fax3PutBits(tif, EOL, 12);
1664 7 : if (sp->bit != 8)
1665 7 : Fax3FlushBits(tif, sp);
1666 7 : return (1);
1667 : }
1668 :
1669 53 : int TIFFInitCCITTFax4(TIFF *tif, int scheme)
1670 : {
1671 : (void)scheme;
1672 53 : if (InitCCITTFax3(tif))
1673 : { /* reuse G3 support */
1674 : /*
1675 : * Merge codec-specific tag information.
1676 : */
1677 53 : if (!_TIFFMergeFields(tif, fax4Fields, TIFFArrayCount(fax4Fields)))
1678 : {
1679 0 : TIFFErrorExtR(tif, "TIFFInitCCITTFax4",
1680 : "Merging CCITT Fax 4 codec-specific tags failed");
1681 0 : return 0;
1682 : }
1683 :
1684 53 : tif->tif_decoderow = Fax4Decode;
1685 53 : tif->tif_decodestrip = Fax4Decode;
1686 53 : tif->tif_decodetile = Fax4Decode;
1687 53 : tif->tif_encoderow = Fax4Encode;
1688 53 : tif->tif_encodestrip = Fax4Encode;
1689 53 : tif->tif_encodetile = Fax4Encode;
1690 53 : tif->tif_postencode = Fax4PostEncode;
1691 : /*
1692 : * Suppress RTC at the end of each strip.
1693 : */
1694 53 : return TIFFSetField(tif, TIFFTAG_FAXMODE, FAXMODE_NORTC);
1695 : }
1696 : else
1697 0 : return (0);
1698 : }
1699 :
1700 : /*
1701 : * CCITT Group 3 1-D Modified Huffman RLE Compression Support.
1702 : * (Compression algorithms 2 and 32771)
1703 : */
1704 :
1705 : /*
1706 : * Decode the requested amount of RLE-encoded data.
1707 : */
1708 1 : static int Fax3DecodeRLE(TIFF *tif, uint8_t *buf, tmsize_t occ, uint16_t s)
1709 : {
1710 1 : DECLARE_STATE(tif, sp, "Fax3DecodeRLE");
1711 1 : int mode = sp->b.mode;
1712 : (void)s;
1713 1 : if (occ % sp->b.rowbytes)
1714 : {
1715 0 : TIFFErrorExtR(tif, module, "Fractional scanlines cannot be read");
1716 0 : return (-1);
1717 : }
1718 1 : CACHE_STATE(tif, sp);
1719 1 : thisrun = sp->curruns;
1720 100 : while (occ > 0)
1721 : {
1722 99 : a0 = 0;
1723 99 : RunLength = 0;
1724 99 : pa = thisrun;
1725 : #ifdef FAX3_DEBUG
1726 : printf("\nBitAcc=%08" PRIX32 ", BitsAvail = %d\n", BitAcc, BitsAvail);
1727 : printf("-------------------- %" PRIu32 "\n", tif->tif_row);
1728 : fflush(stdout);
1729 : #endif
1730 1323 : EXPAND1D(EOFRLE);
1731 99 : (*sp->fill)(buf, thisrun, pa, lastx);
1732 : /*
1733 : * Cleanup at the end of the row.
1734 : */
1735 99 : if (mode & FAXMODE_BYTEALIGN)
1736 : {
1737 99 : int n = BitsAvail - (BitsAvail & ~7);
1738 99 : ClrBits(n);
1739 : }
1740 0 : else if (mode & FAXMODE_WORDALIGN)
1741 : {
1742 0 : int n = BitsAvail - (BitsAvail & ~15);
1743 0 : ClrBits(n);
1744 0 : if (BitsAvail == 0 && !isAligned(cp, uint16_t))
1745 0 : cp++;
1746 : }
1747 99 : buf += sp->b.rowbytes;
1748 99 : occ -= sp->b.rowbytes;
1749 99 : sp->line++;
1750 99 : continue;
1751 0 : EOFRLE: /* premature EOF */
1752 0 : (*sp->fill)(buf, thisrun, pa, lastx);
1753 0 : UNCACHE_STATE(tif, sp);
1754 0 : return (-1);
1755 : }
1756 1 : UNCACHE_STATE(tif, sp);
1757 1 : return (1);
1758 : }
1759 :
1760 8 : int TIFFInitCCITTRLE(TIFF *tif, int scheme)
1761 : {
1762 : (void)scheme;
1763 8 : if (InitCCITTFax3(tif))
1764 : { /* reuse G3 support */
1765 8 : tif->tif_decoderow = Fax3DecodeRLE;
1766 8 : tif->tif_decodestrip = Fax3DecodeRLE;
1767 8 : tif->tif_decodetile = Fax3DecodeRLE;
1768 : /*
1769 : * Suppress RTC+EOLs when encoding and byte-align data.
1770 : */
1771 8 : return TIFFSetField(tif, TIFFTAG_FAXMODE,
1772 : FAXMODE_NORTC | FAXMODE_NOEOL | FAXMODE_BYTEALIGN);
1773 : }
1774 : else
1775 0 : return (0);
1776 : }
1777 :
1778 0 : int TIFFInitCCITTRLEW(TIFF *tif, int scheme)
1779 : {
1780 : (void)scheme;
1781 0 : if (InitCCITTFax3(tif))
1782 : { /* reuse G3 support */
1783 0 : tif->tif_decoderow = Fax3DecodeRLE;
1784 0 : tif->tif_decodestrip = Fax3DecodeRLE;
1785 0 : tif->tif_decodetile = Fax3DecodeRLE;
1786 : /*
1787 : * Suppress RTC+EOLs when encoding and word-align data.
1788 : */
1789 0 : return TIFFSetField(tif, TIFFTAG_FAXMODE,
1790 : FAXMODE_NORTC | FAXMODE_NOEOL | FAXMODE_WORDALIGN);
1791 : }
1792 : else
1793 0 : return (0);
1794 : }
1795 : #endif /* CCITT_SUPPORT */
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