source: liacs/MIR2010/SourceCode/cximage/tiff/tif_dirread.c@ 191

Last change on this file since 191 was 95, checked in by Rick van der Zwet, 15 years ago

Bad boy, improper move of directory
File size: 51.8 KB
Line 
1/* $Id: tif_dirread.c,v 1.82 2006/03/16 12:24:53 dron Exp $ */
2
3/*
4 * Copyright (c) 1988-1997 Sam Leffler
5 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and
8 * its documentation for any purpose is hereby granted without fee, provided
9 * that (i) the above copyright notices and this permission notice appear in
10 * all copies of the software and related documentation, and (ii) the names of
11 * Sam Leffler and Silicon Graphics may not be used in any advertising or
12 * publicity relating to the software without the specific, prior written
13 * permission of Sam Leffler and Silicon Graphics.
14 *
15 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
17 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
20 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
21 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
22 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 */
26
27/*
28 * TIFF Library.
29 *
30 * Directory Read Support Routines.
31 */
32#include "tiffiop.h"
33
34#define IGNORE 0 /* tag placeholder used below */
35
36#ifdef HAVE_IEEEFP
37# define TIFFCvtIEEEFloatToNative(tif, n, fp)
38# define TIFFCvtIEEEDoubleToNative(tif, n, dp)
39#else
40extern void TIFFCvtIEEEFloatToNative(TIFF*, uint32, float*);
41extern void TIFFCvtIEEEDoubleToNative(TIFF*, uint32, double*);
42#endif
43
44static int EstimateStripByteCounts(TIFF*, TIFFDirEntry*, uint16);
45static void MissingRequired(TIFF*, const char*);
46static int CheckDirCount(TIFF*, TIFFDirEntry*, uint32);
47static tsize_t TIFFFetchData(TIFF*, TIFFDirEntry*, char*);
48static tsize_t TIFFFetchString(TIFF*, TIFFDirEntry*, char*);
49static float TIFFFetchRational(TIFF*, TIFFDirEntry*);
50static int TIFFFetchNormalTag(TIFF*, TIFFDirEntry*);
51static int TIFFFetchPerSampleShorts(TIFF*, TIFFDirEntry*, uint16*);
52static int TIFFFetchPerSampleLongs(TIFF*, TIFFDirEntry*, uint32*);
53static int TIFFFetchPerSampleAnys(TIFF*, TIFFDirEntry*, double*);
54static int TIFFFetchShortArray(TIFF*, TIFFDirEntry*, uint16*);
55static int TIFFFetchStripThing(TIFF*, TIFFDirEntry*, long, uint32**);
56static int TIFFFetchRefBlackWhite(TIFF*, TIFFDirEntry*);
57static float TIFFFetchFloat(TIFF*, TIFFDirEntry*);
58static int TIFFFetchFloatArray(TIFF*, TIFFDirEntry*, float*);
59static int TIFFFetchDoubleArray(TIFF*, TIFFDirEntry*, double*);
60static int TIFFFetchAnyArray(TIFF*, TIFFDirEntry*, double*);
61static int TIFFFetchShortPair(TIFF*, TIFFDirEntry*);
62static void ChopUpSingleUncompressedStrip(TIFF*);
63
64/*
65 * Read the next TIFF directory from a file
66 * and convert it to the internal format.
67 * We read directories sequentially.
68 */
69int
70TIFFReadDirectory(TIFF* tif)
71{
72 static const char module[] = "TIFFReadDirectory";
73
74 int n;
75 TIFFDirectory* td;
76 TIFFDirEntry *dp, *dir = NULL;
77 uint16 iv;
78 uint32 v;
79 const TIFFFieldInfo* fip;
80 size_t fix;
81 uint16 dircount;
82 toff_t nextdiroff;
83 int diroutoforderwarning = 0;
84 toff_t* new_dirlist;
85
86 tif->tif_diroff = tif->tif_nextdiroff;
87 if (tif->tif_diroff == 0) /* no more directories */
88 return (0);
89
90 /*
91 * XXX: Trick to prevent IFD looping. The one can create TIFF file
92 * with looped directory pointers. We will maintain a list of already
93 * seen directories and check every IFD offset against this list.
94 */
95 for (n = 0; n < tif->tif_dirnumber; n++) {
96 if (tif->tif_dirlist[n] == tif->tif_diroff)
97 return (0);
98 }
99 tif->tif_dirnumber++;
100 new_dirlist = (toff_t *)_TIFFrealloc(tif->tif_dirlist,
101 tif->tif_dirnumber * sizeof(toff_t));
102 if (!new_dirlist) {
103 TIFFErrorExt(tif->tif_clientdata, module,
104 "%s: Failed to allocate space for IFD list",
105 tif->tif_name);
106 return (0);
107 }
108 tif->tif_dirlist = new_dirlist;
109 tif->tif_dirlist[tif->tif_dirnumber - 1] = tif->tif_diroff;
110
111 /*
112 * Cleanup any previous compression state.
113 */
114 (*tif->tif_cleanup)(tif);
115 tif->tif_curdir++;
116 nextdiroff = 0;
117 if (!isMapped(tif)) {
118 if (!SeekOK(tif, tif->tif_diroff)) {
119 TIFFErrorExt(tif->tif_clientdata, module,
120 "%s: Seek error accessing TIFF directory",
121 tif->tif_name);
122 return (0);
123 }
124 if (!ReadOK(tif, &dircount, sizeof (uint16))) {
125 TIFFErrorExt(tif->tif_clientdata, module,
126 "%s: Can not read TIFF directory count",
127 tif->tif_name);
128 return (0);
129 }
130 if (tif->tif_flags & TIFF_SWAB)
131 TIFFSwabShort(&dircount);
132 dir = (TIFFDirEntry *)_TIFFCheckMalloc(tif, dircount,
133 sizeof (TIFFDirEntry),
134 "to read TIFF directory");
135 if (dir == NULL)
136 return (0);
137 if (!ReadOK(tif, dir, dircount*sizeof (TIFFDirEntry))) {
138 TIFFErrorExt(tif->tif_clientdata, module,
139 "%.100s: Can not read TIFF directory",
140 tif->tif_name);
141 goto bad;
142 }
143 /*
144 * Read offset to next directory for sequential scans.
145 */
146 (void) ReadOK(tif, &nextdiroff, sizeof (uint32));
147 } else {
148 toff_t off = tif->tif_diroff;
149
150 if (off + sizeof (uint16) > tif->tif_size) {
151 TIFFErrorExt(tif->tif_clientdata, module,
152 "%s: Can not read TIFF directory count",
153 tif->tif_name);
154 return (0);
155 } else
156 _TIFFmemcpy(&dircount, tif->tif_base + off, sizeof (uint16));
157 off += sizeof (uint16);
158 if (tif->tif_flags & TIFF_SWAB)
159 TIFFSwabShort(&dircount);
160 dir = (TIFFDirEntry *)_TIFFCheckMalloc(tif, dircount,
161 sizeof (TIFFDirEntry),
162 "to read TIFF directory");
163 if (dir == NULL)
164 return (0);
165 if (off + dircount*sizeof (TIFFDirEntry) > tif->tif_size) {
166 TIFFErrorExt(tif->tif_clientdata, module,
167 "%s: Can not read TIFF directory",
168 tif->tif_name);
169 goto bad;
170 } else {
171 _TIFFmemcpy(dir, tif->tif_base + off,
172 dircount*sizeof (TIFFDirEntry));
173 }
174 off += dircount* sizeof (TIFFDirEntry);
175 if (off + sizeof (uint32) <= tif->tif_size)
176 _TIFFmemcpy(&nextdiroff, tif->tif_base+off, sizeof (uint32));
177 }
178 if (tif->tif_flags & TIFF_SWAB)
179 TIFFSwabLong(&nextdiroff);
180 tif->tif_nextdiroff = nextdiroff;
181
182 tif->tif_flags &= ~TIFF_BEENWRITING; /* reset before new dir */
183 /*
184 * Setup default value and then make a pass over
185 * the fields to check type and tag information,
186 * and to extract info required to size data
187 * structures. A second pass is made afterwards
188 * to read in everthing not taken in the first pass.
189 */
190 td = &tif->tif_dir;
191 /* free any old stuff and reinit */
192 TIFFFreeDirectory(tif);
193 TIFFDefaultDirectory(tif);
194 /*
195 * Electronic Arts writes gray-scale TIFF files
196 * without a PlanarConfiguration directory entry.
197 * Thus we setup a default value here, even though
198 * the TIFF spec says there is no default value.
199 */
200 TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
201
202 /*
203 * Sigh, we must make a separate pass through the
204 * directory for the following reason:
205 *
206 * We must process the Compression tag in the first pass
207 * in order to merge in codec-private tag definitions (otherwise
208 * we may get complaints about unknown tags). However, the
209 * Compression tag may be dependent on the SamplesPerPixel
210 * tag value because older TIFF specs permited Compression
211 * to be written as a SamplesPerPixel-count tag entry.
212 * Thus if we don't first figure out the correct SamplesPerPixel
213 * tag value then we may end up ignoring the Compression tag
214 * value because it has an incorrect count value (if the
215 * true value of SamplesPerPixel is not 1).
216 *
217 * It sure would have been nice if Aldus had really thought
218 * this stuff through carefully.
219 */
220 for (dp = dir, n = dircount; n > 0; n--, dp++) {
221 if (tif->tif_flags & TIFF_SWAB) {
222 TIFFSwabArrayOfShort(&dp->tdir_tag, 2);
223 TIFFSwabArrayOfLong(&dp->tdir_count, 2);
224 }
225 if (dp->tdir_tag == TIFFTAG_SAMPLESPERPIXEL) {
226 if (!TIFFFetchNormalTag(tif, dp))
227 goto bad;
228 dp->tdir_tag = IGNORE;
229 }
230 }
231 /*
232 * First real pass over the directory.
233 */
234 fix = 0;
235 for (dp = dir, n = dircount; n > 0; n--, dp++) {
236
237 if (fix >= tif->tif_nfields || dp->tdir_tag == IGNORE)
238 continue;
239
240 /*
241 * Silicon Beach (at least) writes unordered
242 * directory tags (violating the spec). Handle
243 * it here, but be obnoxious (maybe they'll fix it?).
244 */
245 if (dp->tdir_tag < tif->tif_fieldinfo[fix]->field_tag) {
246 if (!diroutoforderwarning) {
247 TIFFWarningExt(tif->tif_clientdata, module,
248 "%s: invalid TIFF directory; tags are not sorted in ascending order",
249 tif->tif_name);
250 diroutoforderwarning = 1;
251 }
252 fix = 0; /* O(n^2) */
253 }
254 while (fix < tif->tif_nfields &&
255 tif->tif_fieldinfo[fix]->field_tag < dp->tdir_tag)
256 fix++;
257 if (fix >= tif->tif_nfields ||
258 tif->tif_fieldinfo[fix]->field_tag != dp->tdir_tag) {
259
260 TIFFWarningExt(tif->tif_clientdata,
261 module,
262 "%s: unknown field with tag %d (0x%x) encountered",
263 tif->tif_name,
264 dp->tdir_tag,
265 dp->tdir_tag,
266 dp->tdir_type);
267
268 TIFFMergeFieldInfo(tif,
269 _TIFFCreateAnonFieldInfo(tif,
270 dp->tdir_tag,
271 (TIFFDataType) dp->tdir_type),
272 1 );
273 fix = 0;
274 while (fix < tif->tif_nfields &&
275 tif->tif_fieldinfo[fix]->field_tag < dp->tdir_tag)
276 fix++;
277 }
278 /*
279 * Null out old tags that we ignore.
280 */
281 if (tif->tif_fieldinfo[fix]->field_bit == FIELD_IGNORE) {
282 ignore:
283 dp->tdir_tag = IGNORE;
284 continue;
285 }
286 /*
287 * Check data type.
288 */
289 fip = tif->tif_fieldinfo[fix];
290 while (dp->tdir_type != (unsigned short) fip->field_type
291 && fix < tif->tif_nfields) {
292 if (fip->field_type == TIFF_ANY) /* wildcard */
293 break;
294 fip = tif->tif_fieldinfo[++fix];
295 if (fix >= tif->tif_nfields ||
296 fip->field_tag != dp->tdir_tag) {
297 TIFFWarningExt(tif->tif_clientdata, module,
298 "%s: wrong data type %d for \"%s\"; tag ignored",
299 tif->tif_name, dp->tdir_type,
300 tif->tif_fieldinfo[fix-1]->field_name);
301 goto ignore;
302 }
303 }
304 /*
305 * Check count if known in advance.
306 */
307 if (fip->field_readcount != TIFF_VARIABLE
308 && fip->field_readcount != TIFF_VARIABLE2) {
309 uint32 expected = (fip->field_readcount == TIFF_SPP) ?
310 (uint32) td->td_samplesperpixel :
311 (uint32) fip->field_readcount;
312 if (!CheckDirCount(tif, dp, expected))
313 goto ignore;
314 }
315
316 switch (dp->tdir_tag) {
317 case TIFFTAG_COMPRESSION:
318 /*
319 * The 5.0 spec says the Compression tag has
320 * one value, while earlier specs say it has
321 * one value per sample. Because of this, we
322 * accept the tag if one value is supplied.
323 */
324 if (dp->tdir_count == 1) {
325 v = TIFFExtractData(tif,
326 dp->tdir_type, dp->tdir_offset);
327 if (!TIFFSetField(tif, dp->tdir_tag, (uint16)v))
328 goto bad;
329 break;
330 /* XXX: workaround for broken TIFFs */
331 } else if (dp->tdir_type == TIFF_LONG) {
332 if (!TIFFFetchPerSampleLongs(tif, dp, &v) ||
333 !TIFFSetField(tif, dp->tdir_tag, (uint16)v))
334 goto bad;
335 } else {
336 if (!TIFFFetchPerSampleShorts(tif, dp, &iv)
337 || !TIFFSetField(tif, dp->tdir_tag, iv))
338 goto bad;
339 }
340 dp->tdir_tag = IGNORE;
341 break;
342 case TIFFTAG_STRIPOFFSETS:
343 case TIFFTAG_STRIPBYTECOUNTS:
344 case TIFFTAG_TILEOFFSETS:
345 case TIFFTAG_TILEBYTECOUNTS:
346 TIFFSetFieldBit(tif, fip->field_bit);
347 break;
348 case TIFFTAG_IMAGEWIDTH:
349 case TIFFTAG_IMAGELENGTH:
350 case TIFFTAG_IMAGEDEPTH:
351 case TIFFTAG_TILELENGTH:
352 case TIFFTAG_TILEWIDTH:
353 case TIFFTAG_TILEDEPTH:
354 case TIFFTAG_PLANARCONFIG:
355 case TIFFTAG_ROWSPERSTRIP:
356 case TIFFTAG_EXTRASAMPLES:
357 if (!TIFFFetchNormalTag(tif, dp))
358 goto bad;
359 dp->tdir_tag = IGNORE;
360 break;
361 }
362 }
363
364 /*
365 * Allocate directory structure and setup defaults.
366 */
367 if (!TIFFFieldSet(tif, FIELD_IMAGEDIMENSIONS)) {
368 MissingRequired(tif, "ImageLength");
369 goto bad;
370 }
371 /*
372 * Setup appropriate structures (by strip or by tile)
373 */
374 if (!TIFFFieldSet(tif, FIELD_TILEDIMENSIONS)) {
375 td->td_nstrips = TIFFNumberOfStrips(tif);
376 td->td_tilewidth = td->td_imagewidth;
377 td->td_tilelength = td->td_rowsperstrip;
378 td->td_tiledepth = td->td_imagedepth;
379 tif->tif_flags &= ~TIFF_ISTILED;
380 } else {
381 td->td_nstrips = TIFFNumberOfTiles(tif);
382 tif->tif_flags |= TIFF_ISTILED;
383 }
384 if (!td->td_nstrips) {
385 TIFFErrorExt(tif->tif_clientdata, module,
386 "%s: cannot handle zero number of %s",
387 tif->tif_name, isTiled(tif) ? "tiles" : "strips");
388 goto bad;
389 }
390 td->td_stripsperimage = td->td_nstrips;
391 if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
392 td->td_stripsperimage /= td->td_samplesperpixel;
393 if (!TIFFFieldSet(tif, FIELD_STRIPOFFSETS)) {
394 MissingRequired(tif,
395 isTiled(tif) ? "TileOffsets" : "StripOffsets");
396 goto bad;
397 }
398
399 /*
400 * Second pass: extract other information.
401 */
402 for (dp = dir, n = dircount; n > 0; n--, dp++) {
403 if (dp->tdir_tag == IGNORE)
404 continue;
405 switch (dp->tdir_tag) {
406 case TIFFTAG_MINSAMPLEVALUE:
407 case TIFFTAG_MAXSAMPLEVALUE:
408 case TIFFTAG_BITSPERSAMPLE:
409 case TIFFTAG_DATATYPE:
410 case TIFFTAG_SAMPLEFORMAT:
411 /*
412 * The 5.0 spec says the Compression tag has
413 * one value, while earlier specs say it has
414 * one value per sample. Because of this, we
415 * accept the tag if one value is supplied.
416 *
417 * The MinSampleValue, MaxSampleValue, BitsPerSample
418 * DataType and SampleFormat tags are supposed to be
419 * written as one value/sample, but some vendors
420 * incorrectly write one value only -- so we accept
421 * that as well (yech). Other vendors write correct
422 * value for NumberOfSamples, but incorrect one for
423 * BitsPerSample and friends, and we will read this
424 * too.
425 */
426 if (dp->tdir_count == 1) {
427 v = TIFFExtractData(tif,
428 dp->tdir_type, dp->tdir_offset);
429 if (!TIFFSetField(tif, dp->tdir_tag, (uint16)v))
430 goto bad;
431 /* XXX: workaround for broken TIFFs */
432 } else if (dp->tdir_tag == TIFFTAG_BITSPERSAMPLE
433 && dp->tdir_type == TIFF_LONG) {
434 if (!TIFFFetchPerSampleLongs(tif, dp, &v) ||
435 !TIFFSetField(tif, dp->tdir_tag, (uint16)v))
436 goto bad;
437 } else {
438 if (!TIFFFetchPerSampleShorts(tif, dp, &iv) ||
439 !TIFFSetField(tif, dp->tdir_tag, iv))
440 goto bad;
441 }
442 break;
443 case TIFFTAG_SMINSAMPLEVALUE:
444 case TIFFTAG_SMAXSAMPLEVALUE:
445 {
446 double dv = 0.0;
447 if (!TIFFFetchPerSampleAnys(tif, dp, &dv) ||
448 !TIFFSetField(tif, dp->tdir_tag, dv))
449 goto bad;
450 }
451 break;
452 case TIFFTAG_STRIPOFFSETS:
453 case TIFFTAG_TILEOFFSETS:
454 if (!TIFFFetchStripThing(tif, dp,
455 td->td_nstrips, &td->td_stripoffset))
456 goto bad;
457 break;
458 case TIFFTAG_STRIPBYTECOUNTS:
459 case TIFFTAG_TILEBYTECOUNTS:
460 if (!TIFFFetchStripThing(tif, dp,
461 td->td_nstrips, &td->td_stripbytecount))
462 goto bad;
463 break;
464 case TIFFTAG_COLORMAP:
465 case TIFFTAG_TRANSFERFUNCTION:
466 {
467 char* cp;
468 /*
469 * TransferFunction can have either 1x or 3x
470 * data values; Colormap can have only 3x
471 * items.
472 */
473 v = 1L<<td->td_bitspersample;
474 if (dp->tdir_tag == TIFFTAG_COLORMAP ||
475 dp->tdir_count != v) {
476 if (!CheckDirCount(tif, dp, 3 * v))
477 break;
478 }
479 v *= sizeof(uint16);
480 cp = (char *)_TIFFCheckMalloc(tif,
481 dp->tdir_count,
482 sizeof (uint16),
483 "to read \"TransferFunction\" tag");
484 if (cp != NULL) {
485 if (TIFFFetchData(tif, dp, cp)) {
486 /*
487 * This deals with there being
488 * only one array to apply to
489 * all samples.
490 */
491 uint32 c = 1L << td->td_bitspersample;
492 if (dp->tdir_count == c)
493 v = 0L;
494 TIFFSetField(tif, dp->tdir_tag,
495 cp, cp+v, cp+2*v);
496 }
497 _TIFFfree(cp);
498 }
499 break;
500 }
501 case TIFFTAG_PAGENUMBER:
502 case TIFFTAG_HALFTONEHINTS:
503 case TIFFTAG_YCBCRSUBSAMPLING:
504 case TIFFTAG_DOTRANGE:
505 (void) TIFFFetchShortPair(tif, dp);
506 break;
507 case TIFFTAG_REFERENCEBLACKWHITE:
508 (void) TIFFFetchRefBlackWhite(tif, dp);
509 break;
510/* BEGIN REV 4.0 COMPATIBILITY */
511 case TIFFTAG_OSUBFILETYPE:
512 v = 0L;
513 switch (TIFFExtractData(tif, dp->tdir_type,
514 dp->tdir_offset)) {
515 case OFILETYPE_REDUCEDIMAGE:
516 v = FILETYPE_REDUCEDIMAGE;
517 break;
518 case OFILETYPE_PAGE:
519 v = FILETYPE_PAGE;
520 break;
521 }
522 if (v)
523 TIFFSetField(tif, TIFFTAG_SUBFILETYPE, v);
524 break;
525/* END REV 4.0 COMPATIBILITY */
526 default:
527 (void) TIFFFetchNormalTag(tif, dp);
528 break;
529 }
530 }
531 /*
532 * Verify Palette image has a Colormap.
533 */
534 if (td->td_photometric == PHOTOMETRIC_PALETTE &&
535 !TIFFFieldSet(tif, FIELD_COLORMAP)) {
536 MissingRequired(tif, "Colormap");
537 goto bad;
538 }
539 /*
540 * Attempt to deal with a missing StripByteCounts tag.
541 */
542 if (!TIFFFieldSet(tif, FIELD_STRIPBYTECOUNTS)) {
543 /*
544 * Some manufacturers violate the spec by not giving
545 * the size of the strips. In this case, assume there
546 * is one uncompressed strip of data.
547 */
548 if ((td->td_planarconfig == PLANARCONFIG_CONTIG &&
549 td->td_nstrips > 1) ||
550 (td->td_planarconfig == PLANARCONFIG_SEPARATE &&
551 td->td_nstrips != td->td_samplesperpixel)) {
552 MissingRequired(tif, "StripByteCounts");
553 goto bad;
554 }
555 TIFFWarningExt(tif->tif_clientdata, module,
556 "%s: TIFF directory is missing required "
557 "\"%s\" field, calculating from imagelength",
558 tif->tif_name,
559 _TIFFFieldWithTag(tif,TIFFTAG_STRIPBYTECOUNTS)->field_name);
560 if (EstimateStripByteCounts(tif, dir, dircount) < 0)
561 goto bad;
562/*
563 * Assume we have wrong StripByteCount value (in case of single strip) in
564 * following cases:
565 * - it is equal to zero along with StripOffset;
566 * - it is larger than file itself (in case of uncompressed image);
567 * - it is smaller than the size of the bytes per row multiplied on the
568 * number of rows. The last case should not be checked in the case of
569 * writing new image, because we may do not know the exact strip size
570 * until the whole image will be written and directory dumped out.
571 */
572#define BYTECOUNTLOOKSBAD \
573 ( (td->td_stripbytecount[0] == 0 && td->td_stripoffset[0] != 0) || \
574 (td->td_compression == COMPRESSION_NONE && \
575 td->td_stripbytecount[0] > TIFFGetFileSize(tif) - td->td_stripoffset[0]) || \
576 (tif->tif_mode == O_RDONLY && \
577 td->td_compression == COMPRESSION_NONE && \
578 td->td_stripbytecount[0] < TIFFScanlineSize(tif) * td->td_imagelength) )
579
580 } else if (td->td_nstrips == 1
581 && td->td_stripoffset[0] != 0
582 && BYTECOUNTLOOKSBAD) {
583 /*
584 * XXX: Plexus (and others) sometimes give a value of zero for
585 * a tag when they don't know what the correct value is! Try
586 * and handle the simple case of estimating the size of a one
587 * strip image.
588 */
589 TIFFWarningExt(tif->tif_clientdata, module,
590 "%s: Bogus \"%s\" field, ignoring and calculating from imagelength",
591 tif->tif_name,
592 _TIFFFieldWithTag(tif,TIFFTAG_STRIPBYTECOUNTS)->field_name);
593 if(EstimateStripByteCounts(tif, dir, dircount) < 0)
594 goto bad;
595 } else if (td->td_planarconfig == PLANARCONFIG_CONTIG
596 && td->td_nstrips > 2
597 && td->td_compression == COMPRESSION_NONE
598 && td->td_stripbytecount[0] != td->td_stripbytecount[1]) {
599 /*
600 * XXX: Some vendors fill StripByteCount array with absolutely
601 * wrong values (it can be equal to StripOffset array, for
602 * example). Catch this case here.
603 */
604 TIFFWarningExt(tif->tif_clientdata, module,
605 "%s: Wrong \"%s\" field, ignoring and calculating from imagelength",
606 tif->tif_name,
607 _TIFFFieldWithTag(tif,TIFFTAG_STRIPBYTECOUNTS)->field_name);
608 if (EstimateStripByteCounts(tif, dir, dircount) < 0)
609 goto bad;
610 }
611 if (dir) {
612 _TIFFfree((char *)dir);
613 dir = NULL;
614 }
615 if (!TIFFFieldSet(tif, FIELD_MAXSAMPLEVALUE))
616 td->td_maxsamplevalue = (uint16)((1L<<td->td_bitspersample)-1);
617 /*
618 * Setup default compression scheme.
619 */
620
621 /*
622 * XXX: We can optimize checking for the strip bounds using the sorted
623 * bytecounts array. See also comments for TIFFAppendToStrip()
624 * function in tif_write.c.
625 */
626 if (td->td_nstrips > 1) {
627 tstrip_t strip;
628
629 td->td_stripbytecountsorted = 1;
630 for (strip = 1; strip < td->td_nstrips; strip++) {
631 if (td->td_stripoffset[strip - 1] >
632 td->td_stripoffset[strip]) {
633 td->td_stripbytecountsorted = 0;
634 break;
635 }
636 }
637 }
638
639 if (!TIFFFieldSet(tif, FIELD_COMPRESSION))
640 TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
641 /*
642 * Some manufacturers make life difficult by writing
643 * large amounts of uncompressed data as a single strip.
644 * This is contrary to the recommendations of the spec.
645 * The following makes an attempt at breaking such images
646 * into strips closer to the recommended 8k bytes. A
647 * side effect, however, is that the RowsPerStrip tag
648 * value may be changed.
649 */
650 if (td->td_nstrips == 1 && td->td_compression == COMPRESSION_NONE &&
651 (tif->tif_flags & (TIFF_STRIPCHOP|TIFF_ISTILED)) == TIFF_STRIPCHOP)
652 ChopUpSingleUncompressedStrip(tif);
653
654 /*
655 * Reinitialize i/o since we are starting on a new directory.
656 */
657 tif->tif_row = (uint32) -1;
658 tif->tif_curstrip = (tstrip_t) -1;
659 tif->tif_col = (uint32) -1;
660 tif->tif_curtile = (ttile_t) -1;
661 tif->tif_tilesize = (tsize_t) -1;
662
663 tif->tif_scanlinesize = TIFFScanlineSize(tif);
664 if (!tif->tif_scanlinesize) {
665 TIFFErrorExt(tif->tif_clientdata, module, "%s: cannot handle zero scanline size",
666 tif->tif_name);
667 return (0);
668 }
669
670 if (isTiled(tif)) {
671 tif->tif_tilesize = TIFFTileSize(tif);
672 if (!tif->tif_tilesize) {
673 TIFFErrorExt(tif->tif_clientdata, module, "%s: cannot handle zero tile size",
674 tif->tif_name);
675 return (0);
676 }
677 } else {
678 if (!TIFFStripSize(tif)) {
679 TIFFErrorExt(tif->tif_clientdata, module, "%s: cannot handle zero strip size",
680 tif->tif_name);
681 return (0);
682 }
683 }
684 return (1);
685bad:
686 if (dir)
687 _TIFFfree(dir);
688 return (0);
689}
690
691/*
692 * Read custom directory from the arbitarry offset.
693 * The code is very similar to TIFFReadDirectory().
694 */
695int
696TIFFReadCustomDirectory(TIFF* tif, toff_t diroff,
697 const TIFFFieldInfo info[], size_t n)
698{
699 static const char module[] = "TIFFReadCustomDirectory";
700
701 TIFFDirectory* td = &tif->tif_dir;
702 TIFFDirEntry *dp, *dir = NULL;
703 const TIFFFieldInfo* fip;
704 size_t fix;
705 uint16 i, dircount;
706
707 _TIFFSetupFieldInfo(tif, info, n);
708
709 tif->tif_diroff = diroff;
710
711 if (!isMapped(tif)) {
712 if (!SeekOK(tif, diroff)) {
713 TIFFErrorExt(tif->tif_clientdata, module,
714 "%s: Seek error accessing TIFF directory",
715 tif->tif_name);
716 return (0);
717 }
718 if (!ReadOK(tif, &dircount, sizeof (uint16))) {
719 TIFFErrorExt(tif->tif_clientdata, module,
720 "%s: Can not read TIFF directory count",
721 tif->tif_name);
722 return (0);
723 }
724 if (tif->tif_flags & TIFF_SWAB)
725 TIFFSwabShort(&dircount);
726 dir = (TIFFDirEntry *)_TIFFCheckMalloc(tif, dircount,
727 sizeof (TIFFDirEntry),
728 "to read TIFF custom directory");
729 if (dir == NULL)
730 return (0);
731 if (!ReadOK(tif, dir, dircount * sizeof (TIFFDirEntry))) {
732 TIFFErrorExt(tif->tif_clientdata, module,
733 "%.100s: Can not read TIFF directory",
734 tif->tif_name);
735 goto bad;
736 }
737 } else {
738 toff_t off = diroff;
739
740 if (off + sizeof (uint16) > tif->tif_size) {
741 TIFFErrorExt(tif->tif_clientdata, module,
742 "%s: Can not read TIFF directory count",
743 tif->tif_name);
744 return (0);
745 } else
746 _TIFFmemcpy(&dircount, tif->tif_base + off, sizeof (uint16));
747 off += sizeof (uint16);
748 if (tif->tif_flags & TIFF_SWAB)
749 TIFFSwabShort(&dircount);
750 dir = (TIFFDirEntry *)_TIFFCheckMalloc(tif, dircount,
751 sizeof (TIFFDirEntry),
752 "to read TIFF custom directory");
753 if (dir == NULL)
754 return (0);
755 if (off + dircount * sizeof (TIFFDirEntry) > tif->tif_size) {
756 TIFFErrorExt(tif->tif_clientdata, module,
757 "%s: Can not read TIFF directory",
758 tif->tif_name);
759 goto bad;
760 } else {
761 _TIFFmemcpy(dir, tif->tif_base + off,
762 dircount * sizeof (TIFFDirEntry));
763 }
764 }
765
766 TIFFFreeDirectory(tif);
767
768 fix = 0;
769 for (dp = dir, i = dircount; i > 0; i--, dp++) {
770 if (tif->tif_flags & TIFF_SWAB) {
771 TIFFSwabArrayOfShort(&dp->tdir_tag, 2);
772 TIFFSwabArrayOfLong(&dp->tdir_count, 2);
773 }
774
775 if (fix >= tif->tif_nfields || dp->tdir_tag == IGNORE)
776 continue;
777
778 while (fix < tif->tif_nfields &&
779 tif->tif_fieldinfo[fix]->field_tag < dp->tdir_tag)
780 fix++;
781
782 if (fix >= tif->tif_nfields ||
783 tif->tif_fieldinfo[fix]->field_tag != dp->tdir_tag) {
784
785 TIFFWarningExt(tif->tif_clientdata, module,
786 "%s: unknown field with tag %d (0x%x) encountered",
787 tif->tif_name, dp->tdir_tag, dp->tdir_tag,
788 dp->tdir_type);
789
790 TIFFMergeFieldInfo(tif,
791 _TIFFCreateAnonFieldInfo(tif,
792 dp->tdir_tag,
793 (TIFFDataType)dp->tdir_type),
794 1);
795
796 fix = 0;
797 while (fix < tif->tif_nfields &&
798 tif->tif_fieldinfo[fix]->field_tag < dp->tdir_tag)
799 fix++;
800 }
801 /*
802 * Null out old tags that we ignore.
803 */
804 if (tif->tif_fieldinfo[fix]->field_bit == FIELD_IGNORE) {
805 ignore:
806 dp->tdir_tag = IGNORE;
807 continue;
808 }
809 /*
810 * Check data type.
811 */
812 fip = tif->tif_fieldinfo[fix];
813 while (dp->tdir_type != (unsigned short) fip->field_type
814 && fix < tif->tif_nfields) {
815 if (fip->field_type == TIFF_ANY) /* wildcard */
816 break;
817 fip = tif->tif_fieldinfo[++fix];
818 if (fix >= tif->tif_nfields ||
819 fip->field_tag != dp->tdir_tag) {
820 TIFFWarningExt(tif->tif_clientdata, module,
821 "%s: wrong data type %d for \"%s\"; tag ignored",
822 tif->tif_name, dp->tdir_type,
823 tif->tif_fieldinfo[fix-1]->field_name);
824 goto ignore;
825 }
826 }
827 /*
828 * Check count if known in advance.
829 */
830 if (fip->field_readcount != TIFF_VARIABLE
831 && fip->field_readcount != TIFF_VARIABLE2) {
832 uint32 expected = (fip->field_readcount == TIFF_SPP) ?
833 (uint32) td->td_samplesperpixel :
834 (uint32) fip->field_readcount;
835 if (!CheckDirCount(tif, dp, expected))
836 goto ignore;
837 }
838
839 (void) TIFFFetchNormalTag(tif, dp);
840 }
841
842 if (dir)
843 _TIFFfree(dir);
844 return 1;
845
846bad:
847 if (dir)
848 _TIFFfree(dir);
849 return 0;
850}
851
852/*
853 * EXIF is important special case of custom IFD, so we have a special
854 * function to read it.
855 */
856int
857TIFFReadEXIFDirectory(TIFF* tif, toff_t diroff)
858{
859 size_t exifFieldInfoCount;
860 const TIFFFieldInfo *exifFieldInfo =
861 _TIFFGetExifFieldInfo(&exifFieldInfoCount);
862 return TIFFReadCustomDirectory(tif, diroff, exifFieldInfo,
863 exifFieldInfoCount);
864}
865
866static int
867EstimateStripByteCounts(TIFF* tif, TIFFDirEntry* dir, uint16 dircount)
868{
869 static const char module[] = "EstimateStripByteCounts";
870
871 register TIFFDirEntry *dp;
872 register TIFFDirectory *td = &tif->tif_dir;
873 uint16 i;
874
875 if (td->td_stripbytecount)
876 _TIFFfree(td->td_stripbytecount);
877 td->td_stripbytecount = (uint32*)
878 _TIFFCheckMalloc(tif, td->td_nstrips, sizeof (uint32),
879 "for \"StripByteCounts\" array");
880 if (td->td_compression != COMPRESSION_NONE) {
881 uint32 space = (uint32)(sizeof (TIFFHeader)
882 + sizeof (uint16)
883 + (dircount * sizeof (TIFFDirEntry))
884 + sizeof (uint32));
885 toff_t filesize = TIFFGetFileSize(tif);
886 uint16 n;
887
888 /* calculate amount of space used by indirect values */
889 for (dp = dir, n = dircount; n > 0; n--, dp++)
890 {
891 uint32 cc = TIFFDataWidth((TIFFDataType) dp->tdir_type);
892 if (cc == 0) {
893 TIFFErrorExt(tif->tif_clientdata, module,
894 "%s: Cannot determine size of unknown tag type %d",
895 tif->tif_name, dp->tdir_type);
896 return -1;
897 }
898 cc = cc * dp->tdir_count;
899 if (cc > sizeof (uint32))
900 space += cc;
901 }
902 space = filesize - space;
903 if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
904 space /= td->td_samplesperpixel;
905 for (i = 0; i < td->td_nstrips; i++)
906 td->td_stripbytecount[i] = space;
907 /*
908 * This gross hack handles the case were the offset to
909 * the last strip is past the place where we think the strip
910 * should begin. Since a strip of data must be contiguous,
911 * it's safe to assume that we've overestimated the amount
912 * of data in the strip and trim this number back accordingly.
913 */
914 i--;
915 if (((toff_t)(td->td_stripoffset[i]+td->td_stripbytecount[i]))
916 > filesize)
917 td->td_stripbytecount[i] =
918 filesize - td->td_stripoffset[i];
919 } else {
920 uint32 rowbytes = TIFFScanlineSize(tif);
921 uint32 rowsperstrip = td->td_imagelength/td->td_stripsperimage;
922 for (i = 0; i < td->td_nstrips; i++)
923 td->td_stripbytecount[i] = rowbytes*rowsperstrip;
924 }
925 TIFFSetFieldBit(tif, FIELD_STRIPBYTECOUNTS);
926 if (!TIFFFieldSet(tif, FIELD_ROWSPERSTRIP))
927 td->td_rowsperstrip = td->td_imagelength;
928 return 1;
929}
930
931static void
932MissingRequired(TIFF* tif, const char* tagname)
933{
934 static const char module[] = "MissingRequired";
935
936 TIFFErrorExt(tif->tif_clientdata, module,
937 "%s: TIFF directory is missing required \"%s\" field",
938 tif->tif_name, tagname);
939}
940
941/*
942 * Check the count field of a directory
943 * entry against a known value. The caller
944 * is expected to skip/ignore the tag if
945 * there is a mismatch.
946 */
947static int
948CheckDirCount(TIFF* tif, TIFFDirEntry* dir, uint32 count)
949{
950 if (count > dir->tdir_count) {
951 TIFFWarningExt(tif->tif_clientdata, tif->tif_name,
952 "incorrect count for field \"%s\" (%lu, expecting %lu); tag ignored",
953 _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name,
954 dir->tdir_count, count);
955 return (0);
956 } else if (count < dir->tdir_count) {
957 TIFFWarningExt(tif->tif_clientdata, tif->tif_name,
958 "incorrect count for field \"%s\" (%lu, expecting %lu); tag trimmed",
959 _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name,
960 dir->tdir_count, count);
961 return (1);
962 }
963 return (1);
964}
965
966/*
967 * Fetch a contiguous directory item.
968 */
969static tsize_t
970TIFFFetchData(TIFF* tif, TIFFDirEntry* dir, char* cp)
971{
972 int w = TIFFDataWidth((TIFFDataType) dir->tdir_type);
973 tsize_t cc = dir->tdir_count * w;
974
975 /* Check for overflow. */
976 if (!dir->tdir_count || !w || cc / w != (tsize_t)dir->tdir_count)
977 goto bad;
978
979 if (!isMapped(tif)) {
980 if (!SeekOK(tif, dir->tdir_offset))
981 goto bad;
982 if (!ReadOK(tif, cp, cc))
983 goto bad;
984 } else {
985 /* Check for overflow. */
986 if ((tsize_t)dir->tdir_offset + cc < (tsize_t)dir->tdir_offset
987 || (tsize_t)dir->tdir_offset + cc < cc
988 || (tsize_t)dir->tdir_offset + cc > (tsize_t)tif->tif_size)
989 goto bad;
990 _TIFFmemcpy(cp, tif->tif_base + dir->tdir_offset, cc);
991 }
992 if (tif->tif_flags & TIFF_SWAB) {
993 switch (dir->tdir_type) {
994 case TIFF_SHORT:
995 case TIFF_SSHORT:
996 TIFFSwabArrayOfShort((uint16*) cp, dir->tdir_count);
997 break;
998 case TIFF_LONG:
999 case TIFF_SLONG:
1000 case TIFF_FLOAT:
1001 TIFFSwabArrayOfLong((uint32*) cp, dir->tdir_count);
1002 break;
1003 case TIFF_RATIONAL:
1004 case TIFF_SRATIONAL:
1005 TIFFSwabArrayOfLong((uint32*) cp, 2*dir->tdir_count);
1006 break;
1007 case TIFF_DOUBLE:
1008 TIFFSwabArrayOfDouble((double*) cp, dir->tdir_count);
1009 break;
1010 }
1011 }
1012 return (cc);
1013bad:
1014 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1015 "Error fetching data for field \"%s\"",
1016 _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
1017 return (tsize_t) 0;
1018}
1019
1020/*
1021 * Fetch an ASCII item from the file.
1022 */
1023static tsize_t
1024TIFFFetchString(TIFF* tif, TIFFDirEntry* dir, char* cp)
1025{
1026 if (dir->tdir_count <= 4) {
1027 uint32 l = dir->tdir_offset;
1028 if (tif->tif_flags & TIFF_SWAB)
1029 TIFFSwabLong(&l);
1030 _TIFFmemcpy(cp, &l, dir->tdir_count);
1031 return (1);
1032 }
1033 return (TIFFFetchData(tif, dir, cp));
1034}
1035
1036/*
1037 * Convert numerator+denominator to float.
1038 */
1039static int
1040cvtRational(TIFF* tif, TIFFDirEntry* dir, uint32 num, uint32 denom, float* rv)
1041{
1042 if (denom == 0) {
1043 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1044 "%s: Rational with zero denominator (num = %lu)",
1045 _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name, num);
1046 return (0);
1047 } else {
1048 if (dir->tdir_type == TIFF_RATIONAL)
1049 *rv = ((float)num / (float)denom);
1050 else
1051 *rv = ((float)(int32)num / (float)(int32)denom);
1052 return (1);
1053 }
1054}
1055
1056/*
1057 * Fetch a rational item from the file
1058 * at offset off and return the value
1059 * as a floating point number.
1060 */
1061static float
1062TIFFFetchRational(TIFF* tif, TIFFDirEntry* dir)
1063{
1064 uint32 l[2];
1065 float v;
1066
1067 return (!TIFFFetchData(tif, dir, (char *)l) ||
1068 !cvtRational(tif, dir, l[0], l[1], &v) ? 1.0f : v);
1069}
1070
1071/*
1072 * Fetch a single floating point value
1073 * from the offset field and return it
1074 * as a native float.
1075 */
1076static float
1077TIFFFetchFloat(TIFF* tif, TIFFDirEntry* dir)
1078{
1079 float v;
1080 int32 l = TIFFExtractData(tif, dir->tdir_type, dir->tdir_offset);
1081 _TIFFmemcpy(&v, &l, sizeof(float));
1082 TIFFCvtIEEEFloatToNative(tif, 1, &v);
1083 return (v);
1084}
1085
1086/*
1087 * Fetch an array of BYTE or SBYTE values.
1088 */
1089static int
1090TIFFFetchByteArray(TIFF* tif, TIFFDirEntry* dir, uint8* v)
1091{
1092 if (dir->tdir_count <= 4) {
1093 /*
1094 * Extract data from offset field.
1095 */
1096 if (tif->tif_header.tiff_magic == TIFF_BIGENDIAN) {
1097 if (dir->tdir_type == TIFF_SBYTE)
1098 switch (dir->tdir_count) {
1099 case 4: v[3] = dir->tdir_offset & 0xff;
1100 case 3: v[2] = (dir->tdir_offset >> 8) & 0xff;
1101 case 2: v[1] = (dir->tdir_offset >> 16) & 0xff;
1102 case 1: v[0] = dir->tdir_offset >> 24;
1103 }
1104 else
1105 switch (dir->tdir_count) {
1106 case 4: v[3] = dir->tdir_offset & 0xff;
1107 case 3: v[2] = (dir->tdir_offset >> 8) & 0xff;
1108 case 2: v[1] = (dir->tdir_offset >> 16) & 0xff;
1109 case 1: v[0] = dir->tdir_offset >> 24;
1110 }
1111 } else {
1112 if (dir->tdir_type == TIFF_SBYTE)
1113 switch (dir->tdir_count) {
1114 case 4: v[3] = dir->tdir_offset >> 24;
1115 case 3: v[2] = (dir->tdir_offset >> 16) & 0xff;
1116 case 2: v[1] = (dir->tdir_offset >> 8) & 0xff;
1117 case 1: v[0] = dir->tdir_offset & 0xff;
1118 }
1119 else
1120 switch (dir->tdir_count) {
1121 case 4: v[3] = dir->tdir_offset >> 24;
1122 case 3: v[2] = (dir->tdir_offset >> 16) & 0xff;
1123 case 2: v[1] = (dir->tdir_offset >> 8) & 0xff;
1124 case 1: v[0] = dir->tdir_offset & 0xff;
1125 }
1126 }
1127 return (1);
1128 } else
1129 return (TIFFFetchData(tif, dir, (char*) v) != 0); /* XXX */
1130}
1131
1132/*
1133 * Fetch an array of SHORT or SSHORT values.
1134 */
1135static int
1136TIFFFetchShortArray(TIFF* tif, TIFFDirEntry* dir, uint16* v)
1137{
1138 if (dir->tdir_count <= 2) {
1139 if (tif->tif_header.tiff_magic == TIFF_BIGENDIAN) {
1140 switch (dir->tdir_count) {
1141 case 2: v[1] = (uint16) (dir->tdir_offset & 0xffff);
1142 case 1: v[0] = (uint16) (dir->tdir_offset >> 16);
1143 }
1144 } else {
1145 switch (dir->tdir_count) {
1146 case 2: v[1] = (uint16) (dir->tdir_offset >> 16);
1147 case 1: v[0] = (uint16) (dir->tdir_offset & 0xffff);
1148 }
1149 }
1150 return (1);
1151 } else
1152 return (TIFFFetchData(tif, dir, (char *)v) != 0);
1153}
1154
1155/*
1156 * Fetch a pair of SHORT or BYTE values. Some tags may have either BYTE
1157 * or SHORT type and this function works with both ones.
1158 */
1159static int
1160TIFFFetchShortPair(TIFF* tif, TIFFDirEntry* dir)
1161{
1162 switch (dir->tdir_type) {
1163 case TIFF_BYTE:
1164 case TIFF_SBYTE:
1165 {
1166 uint8 v[4];
1167 return TIFFFetchByteArray(tif, dir, v)
1168 && TIFFSetField(tif, dir->tdir_tag, v[0], v[1]);
1169 }
1170 case TIFF_SHORT:
1171 case TIFF_SSHORT:
1172 {
1173 uint16 v[2];
1174 return TIFFFetchShortArray(tif, dir, v)
1175 && TIFFSetField(tif, dir->tdir_tag, v[0], v[1]);
1176 }
1177 default:
1178 return 0;
1179 }
1180}
1181
1182/*
1183 * Fetch an array of LONG or SLONG values.
1184 */
1185static int
1186TIFFFetchLongArray(TIFF* tif, TIFFDirEntry* dir, uint32* v)
1187{
1188 if (dir->tdir_count == 1) {
1189 v[0] = dir->tdir_offset;
1190 return (1);
1191 } else
1192 return (TIFFFetchData(tif, dir, (char*) v) != 0);
1193}
1194
1195/*
1196 * Fetch an array of RATIONAL or SRATIONAL values.
1197 */
1198static int
1199TIFFFetchRationalArray(TIFF* tif, TIFFDirEntry* dir, float* v)
1200{
1201 int ok = 0;
1202 uint32* l;
1203
1204 l = (uint32*)_TIFFCheckMalloc(tif,
1205 dir->tdir_count, TIFFDataWidth((TIFFDataType) dir->tdir_type),
1206 "to fetch array of rationals");
1207 if (l) {
1208 if (TIFFFetchData(tif, dir, (char *)l)) {
1209 uint32 i;
1210 for (i = 0; i < dir->tdir_count; i++) {
1211 ok = cvtRational(tif, dir,
1212 l[2*i+0], l[2*i+1], &v[i]);
1213 if (!ok)
1214 break;
1215 }
1216 }
1217 _TIFFfree((char *)l);
1218 }
1219 return (ok);
1220}
1221
1222/*
1223 * Fetch an array of FLOAT values.
1224 */
1225static int
1226TIFFFetchFloatArray(TIFF* tif, TIFFDirEntry* dir, float* v)
1227{
1228
1229 if (dir->tdir_count == 1) {
1230 v[0] = *(float*) &dir->tdir_offset;
1231 TIFFCvtIEEEFloatToNative(tif, dir->tdir_count, v);
1232 return (1);
1233 } else if (TIFFFetchData(tif, dir, (char*) v)) {
1234 TIFFCvtIEEEFloatToNative(tif, dir->tdir_count, v);
1235 return (1);
1236 } else
1237 return (0);
1238}
1239
1240/*
1241 * Fetch an array of DOUBLE values.
1242 */
1243static int
1244TIFFFetchDoubleArray(TIFF* tif, TIFFDirEntry* dir, double* v)
1245{
1246 if (TIFFFetchData(tif, dir, (char*) v)) {
1247 TIFFCvtIEEEDoubleToNative(tif, dir->tdir_count, v);
1248 return (1);
1249 } else
1250 return (0);
1251}
1252
1253/*
1254 * Fetch an array of ANY values. The actual values are
1255 * returned as doubles which should be able hold all the
1256 * types. Yes, there really should be an tany_t to avoid
1257 * this potential non-portability ... Note in particular
1258 * that we assume that the double return value vector is
1259 * large enough to read in any fundamental type. We use
1260 * that vector as a buffer to read in the base type vector
1261 * and then convert it in place to double (from end
1262 * to front of course).
1263 */
1264static int
1265TIFFFetchAnyArray(TIFF* tif, TIFFDirEntry* dir, double* v)
1266{
1267 int i;
1268
1269 switch (dir->tdir_type) {
1270 case TIFF_BYTE:
1271 case TIFF_SBYTE:
1272 if (!TIFFFetchByteArray(tif, dir, (uint8*) v))
1273 return (0);
1274 if (dir->tdir_type == TIFF_BYTE) {
1275 uint8* vp = (uint8*) v;
1276 for (i = dir->tdir_count-1; i >= 0; i--)
1277 v[i] = vp[i];
1278 } else {
1279 int8* vp = (int8*) v;
1280 for (i = dir->tdir_count-1; i >= 0; i--)
1281 v[i] = vp[i];
1282 }
1283 break;
1284 case TIFF_SHORT:
1285 case TIFF_SSHORT:
1286 if (!TIFFFetchShortArray(tif, dir, (uint16*) v))
1287 return (0);
1288 if (dir->tdir_type == TIFF_SHORT) {
1289 uint16* vp = (uint16*) v;
1290 for (i = dir->tdir_count-1; i >= 0; i--)
1291 v[i] = vp[i];
1292 } else {
1293 int16* vp = (int16*) v;
1294 for (i = dir->tdir_count-1; i >= 0; i--)
1295 v[i] = vp[i];
1296 }
1297 break;
1298 case TIFF_LONG:
1299 case TIFF_SLONG:
1300 if (!TIFFFetchLongArray(tif, dir, (uint32*) v))
1301 return (0);
1302 if (dir->tdir_type == TIFF_LONG) {
1303 uint32* vp = (uint32*) v;
1304 for (i = dir->tdir_count-1; i >= 0; i--)
1305 v[i] = vp[i];
1306 } else {
1307 int32* vp = (int32*) v;
1308 for (i = dir->tdir_count-1; i >= 0; i--)
1309 v[i] = vp[i];
1310 }
1311 break;
1312 case TIFF_RATIONAL:
1313 case TIFF_SRATIONAL:
1314 if (!TIFFFetchRationalArray(tif, dir, (float*) v))
1315 return (0);
1316 { float* vp = (float*) v;
1317 for (i = dir->tdir_count-1; i >= 0; i--)
1318 v[i] = vp[i];
1319 }
1320 break;
1321 case TIFF_FLOAT:
1322 if (!TIFFFetchFloatArray(tif, dir, (float*) v))
1323 return (0);
1324 { float* vp = (float*) v;
1325 for (i = dir->tdir_count-1; i >= 0; i--)
1326 v[i] = vp[i];
1327 }
1328 break;
1329 case TIFF_DOUBLE:
1330 return (TIFFFetchDoubleArray(tif, dir, (double*) v));
1331 default:
1332 /* TIFF_NOTYPE */
1333 /* TIFF_ASCII */
1334 /* TIFF_UNDEFINED */
1335 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1336 "cannot read TIFF_ANY type %d for field \"%s\"",
1337 dir->tdir_type,
1338 _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
1339 return (0);
1340 }
1341 return (1);
1342}
1343
1344/*
1345 * Fetch a tag that is not handled by special case code.
1346 */
1347static int
1348TIFFFetchNormalTag(TIFF* tif, TIFFDirEntry* dp)
1349{
1350 static const char mesg[] = "to fetch tag value";
1351 int ok = 0;
1352 const TIFFFieldInfo* fip = _TIFFFieldWithTag(tif, dp->tdir_tag);
1353
1354 if (dp->tdir_count > 1) { /* array of values */
1355 char* cp = NULL;
1356
1357 switch (dp->tdir_type) {
1358 case TIFF_BYTE:
1359 case TIFF_SBYTE:
1360 cp = (char *)_TIFFCheckMalloc(tif,
1361 dp->tdir_count, sizeof (uint8), mesg);
1362 ok = cp && TIFFFetchByteArray(tif, dp, (uint8*) cp);
1363 break;
1364 case TIFF_SHORT:
1365 case TIFF_SSHORT:
1366 cp = (char *)_TIFFCheckMalloc(tif,
1367 dp->tdir_count, sizeof (uint16), mesg);
1368 ok = cp && TIFFFetchShortArray(tif, dp, (uint16*) cp);
1369 break;
1370 case TIFF_LONG:
1371 case TIFF_SLONG:
1372 cp = (char *)_TIFFCheckMalloc(tif,
1373 dp->tdir_count, sizeof (uint32), mesg);
1374 ok = cp && TIFFFetchLongArray(tif, dp, (uint32*) cp);
1375 break;
1376 case TIFF_RATIONAL:
1377 case TIFF_SRATIONAL:
1378 cp = (char *)_TIFFCheckMalloc(tif,
1379 dp->tdir_count, sizeof (float), mesg);
1380 ok = cp && TIFFFetchRationalArray(tif, dp, (float*) cp);
1381 break;
1382 case TIFF_FLOAT:
1383 cp = (char *)_TIFFCheckMalloc(tif,
1384 dp->tdir_count, sizeof (float), mesg);
1385 ok = cp && TIFFFetchFloatArray(tif, dp, (float*) cp);
1386 break;
1387 case TIFF_DOUBLE:
1388 cp = (char *)_TIFFCheckMalloc(tif,
1389 dp->tdir_count, sizeof (double), mesg);
1390 ok = cp && TIFFFetchDoubleArray(tif, dp, (double*) cp);
1391 break;
1392 case TIFF_ASCII:
1393 case TIFF_UNDEFINED: /* bit of a cheat... */
1394 /*
1395 * Some vendors write strings w/o the trailing
1396 * NULL byte, so always append one just in case.
1397 */
1398 cp = (char *)_TIFFCheckMalloc(tif, dp->tdir_count + 1,
1399 1, mesg);
1400 if( (ok = (cp && TIFFFetchString(tif, dp, cp))) != 0 )
1401 cp[dp->tdir_count] = '\0'; /* XXX */
1402 break;
1403 }
1404 if (ok) {
1405 ok = (fip->field_passcount ?
1406 TIFFSetField(tif, dp->tdir_tag, dp->tdir_count, cp)
1407 : TIFFSetField(tif, dp->tdir_tag, cp));
1408 }
1409 if (cp != NULL)
1410 _TIFFfree(cp);
1411 } else if (CheckDirCount(tif, dp, 1)) { /* singleton value */
1412 switch (dp->tdir_type) {
1413 case TIFF_BYTE:
1414 case TIFF_SBYTE:
1415 case TIFF_SHORT:
1416 case TIFF_SSHORT:
1417 /*
1418 * If the tag is also acceptable as a LONG or SLONG
1419 * then TIFFSetField will expect an uint32 parameter
1420 * passed to it (through varargs). Thus, for machines
1421 * where sizeof (int) != sizeof (uint32) we must do
1422 * a careful check here. It's hard to say if this
1423 * is worth optimizing.
1424 *
1425 * NB: We use TIFFFieldWithTag here knowing that
1426 * it returns us the first entry in the table
1427 * for the tag and that that entry is for the
1428 * widest potential data type the tag may have.
1429 */
1430 { TIFFDataType type = fip->field_type;
1431 if (type != TIFF_LONG && type != TIFF_SLONG) {
1432 uint16 v = (uint16)
1433 TIFFExtractData(tif, dp->tdir_type, dp->tdir_offset);
1434 ok = (fip->field_passcount ?
1435 TIFFSetField(tif, dp->tdir_tag, 1, &v)
1436 : TIFFSetField(tif, dp->tdir_tag, v));
1437 break;
1438 }
1439 }
1440 /* fall thru... */
1441 case TIFF_LONG:
1442 case TIFF_SLONG:
1443 { uint32 v32 =
1444 TIFFExtractData(tif, dp->tdir_type, dp->tdir_offset);
1445 ok = (fip->field_passcount ?
1446 TIFFSetField(tif, dp->tdir_tag, 1, &v32)
1447 : TIFFSetField(tif, dp->tdir_tag, v32));
1448 }
1449 break;
1450 case TIFF_RATIONAL:
1451 case TIFF_SRATIONAL:
1452 case TIFF_FLOAT:
1453 { float v = (dp->tdir_type == TIFF_FLOAT ?
1454 TIFFFetchFloat(tif, dp)
1455 : TIFFFetchRational(tif, dp));
1456 ok = (fip->field_passcount ?
1457 TIFFSetField(tif, dp->tdir_tag, 1, &v)
1458 : TIFFSetField(tif, dp->tdir_tag, v));
1459 }
1460 break;
1461 case TIFF_DOUBLE:
1462 { double v;
1463 ok = (TIFFFetchDoubleArray(tif, dp, &v) &&
1464 (fip->field_passcount ?
1465 TIFFSetField(tif, dp->tdir_tag, 1, &v)
1466 : TIFFSetField(tif, dp->tdir_tag, v))
1467 );
1468 }
1469 break;
1470 case TIFF_ASCII:
1471 case TIFF_UNDEFINED: /* bit of a cheat... */
1472 { char c[2];
1473 if( (ok = (TIFFFetchString(tif, dp, c) != 0)) != 0 ) {
1474 c[1] = '\0'; /* XXX paranoid */
1475 ok = (fip->field_passcount ?
1476 TIFFSetField(tif, dp->tdir_tag, 1, c)
1477 : TIFFSetField(tif, dp->tdir_tag, c));
1478 }
1479 }
1480 break;
1481 }
1482 }
1483 return (ok);
1484}
1485
1486#define NITEMS(x) (sizeof (x) / sizeof (x[0]))
1487/*
1488 * Fetch samples/pixel short values for
1489 * the specified tag and verify that
1490 * all values are the same.
1491 */
1492static int
1493TIFFFetchPerSampleShorts(TIFF* tif, TIFFDirEntry* dir, uint16* pl)
1494{
1495 uint16 samples = tif->tif_dir.td_samplesperpixel;
1496 int status = 0;
1497
1498 if (CheckDirCount(tif, dir, (uint32) samples)) {
1499 uint16 buf[10];
1500 uint16* v = buf;
1501
1502 if (dir->tdir_count > NITEMS(buf))
1503 v = (uint16*) _TIFFCheckMalloc(tif, dir->tdir_count, sizeof(uint16),
1504 "to fetch per-sample values");
1505 if (v && TIFFFetchShortArray(tif, dir, v)) {
1506 uint16 i;
1507 int check_count = dir->tdir_count;
1508 if( samples < check_count )
1509 check_count = samples;
1510
1511 for (i = 1; i < check_count; i++)
1512 if (v[i] != v[0]) {
1513 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1514 "Cannot handle different per-sample values for field \"%s\"",
1515 _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
1516 goto bad;
1517 }
1518 *pl = v[0];
1519 status = 1;
1520 }
1521 bad:
1522 if (v && v != buf)
1523 _TIFFfree(v);
1524 }
1525 return (status);
1526}
1527
1528/*
1529 * Fetch samples/pixel long values for
1530 * the specified tag and verify that
1531 * all values are the same.
1532 */
1533static int
1534TIFFFetchPerSampleLongs(TIFF* tif, TIFFDirEntry* dir, uint32* pl)
1535{
1536 uint16 samples = tif->tif_dir.td_samplesperpixel;
1537 int status = 0;
1538
1539 if (CheckDirCount(tif, dir, (uint32) samples)) {
1540 uint32 buf[10];
1541 uint32* v = buf;
1542
1543 if (dir->tdir_count > NITEMS(buf))
1544 v = (uint32*) _TIFFCheckMalloc(tif, dir->tdir_count, sizeof(uint32),
1545 "to fetch per-sample values");
1546 if (v && TIFFFetchLongArray(tif, dir, v)) {
1547 uint16 i;
1548 int check_count = dir->tdir_count;
1549
1550 if( samples < check_count )
1551 check_count = samples;
1552 for (i = 1; i < check_count; i++)
1553 if (v[i] != v[0]) {
1554 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1555 "Cannot handle different per-sample values for field \"%s\"",
1556 _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
1557 goto bad;
1558 }
1559 *pl = v[0];
1560 status = 1;
1561 }
1562 bad:
1563 if (v && v != buf)
1564 _TIFFfree(v);
1565 }
1566 return (status);
1567}
1568
1569/*
1570 * Fetch samples/pixel ANY values for the specified tag and verify that all
1571 * values are the same.
1572 */
1573static int
1574TIFFFetchPerSampleAnys(TIFF* tif, TIFFDirEntry* dir, double* pl)
1575{
1576 uint16 samples = tif->tif_dir.td_samplesperpixel;
1577 int status = 0;
1578
1579 if (CheckDirCount(tif, dir, (uint32) samples)) {
1580 double buf[10];
1581 double* v = buf;
1582
1583 if (dir->tdir_count > NITEMS(buf))
1584 v = (double*) _TIFFCheckMalloc(tif, dir->tdir_count, sizeof (double),
1585 "to fetch per-sample values");
1586 if (v && TIFFFetchAnyArray(tif, dir, v)) {
1587 uint16 i;
1588 int check_count = dir->tdir_count;
1589 if( samples < check_count )
1590 check_count = samples;
1591
1592 for (i = 1; i < check_count; i++)
1593 if (v[i] != v[0]) {
1594 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1595 "Cannot handle different per-sample values for field \"%s\"",
1596 _TIFFFieldWithTag(tif, dir->tdir_tag)->field_name);
1597 goto bad;
1598 }
1599 *pl = v[0];
1600 status = 1;
1601 }
1602 bad:
1603 if (v && v != buf)
1604 _TIFFfree(v);
1605 }
1606 return (status);
1607}
1608#undef NITEMS
1609
1610/*
1611 * Fetch a set of offsets or lengths.
1612 * While this routine says "strips", in fact it's also used for tiles.
1613 */
1614static int
1615TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, long nstrips, uint32** lpp)
1616{
1617 register uint32* lp;
1618 int status;
1619
1620 CheckDirCount(tif, dir, (uint32) nstrips);
1621
1622 /*
1623 * Allocate space for strip information.
1624 */
1625 if (*lpp == NULL &&
1626 (*lpp = (uint32 *)_TIFFCheckMalloc(tif,
1627 nstrips, sizeof (uint32), "for strip array")) == NULL)
1628 return (0);
1629 lp = *lpp;
1630 _TIFFmemset( lp, 0, sizeof(uint32) * nstrips );
1631
1632 if (dir->tdir_type == (int)TIFF_SHORT) {
1633 /*
1634 * Handle uint16->uint32 expansion.
1635 */
1636 uint16* dp = (uint16*) _TIFFCheckMalloc(tif,
1637 dir->tdir_count, sizeof (uint16), "to fetch strip tag");
1638 if (dp == NULL)
1639 return (0);
1640 if( (status = TIFFFetchShortArray(tif, dir, dp)) != 0 ) {
1641 int i;
1642
1643 for( i = 0; i < nstrips && i < (int) dir->tdir_count; i++ )
1644 {
1645 lp[i] = dp[i];
1646 }
1647 }
1648 _TIFFfree((char*) dp);
1649
1650 } else if( nstrips != (int) dir->tdir_count ) {
1651 /* Special case to correct length */
1652
1653 uint32* dp = (uint32*) _TIFFCheckMalloc(tif,
1654 dir->tdir_count, sizeof (uint32), "to fetch strip tag");
1655 if (dp == NULL)
1656 return (0);
1657
1658 status = TIFFFetchLongArray(tif, dir, dp);
1659 if( status != 0 ) {
1660 int i;
1661
1662 for( i = 0; i < nstrips && i < (int) dir->tdir_count; i++ )
1663 {
1664 lp[i] = dp[i];
1665 }
1666 }
1667
1668 _TIFFfree( (char *) dp );
1669 } else
1670 status = TIFFFetchLongArray(tif, dir, lp);
1671
1672 return (status);
1673}
1674
1675/*
1676 * Fetch and set the RefBlackWhite tag.
1677 */
1678static int
1679TIFFFetchRefBlackWhite(TIFF* tif, TIFFDirEntry* dir)
1680{
1681 static const char mesg[] = "for \"ReferenceBlackWhite\" array";
1682 char* cp;
1683 int ok;
1684
1685 if (dir->tdir_type == TIFF_RATIONAL)
1686 return (TIFFFetchNormalTag(tif, dir));
1687 /*
1688 * Handle LONG's for backward compatibility.
1689 */
1690 cp = (char *)_TIFFCheckMalloc(tif, dir->tdir_count,
1691 sizeof (uint32), mesg);
1692 if( (ok = (cp && TIFFFetchLongArray(tif, dir, (uint32*) cp))) != 0) {
1693 float* fp = (float*)
1694 _TIFFCheckMalloc(tif, dir->tdir_count, sizeof (float), mesg);
1695 if( (ok = (fp != NULL)) != 0 ) {
1696 uint32 i;
1697 for (i = 0; i < dir->tdir_count; i++)
1698 fp[i] = (float)((uint32*) cp)[i];
1699 ok = TIFFSetField(tif, dir->tdir_tag, fp);
1700 _TIFFfree((char*) fp);
1701 }
1702 }
1703 if (cp)
1704 _TIFFfree(cp);
1705 return (ok);
1706}
1707
1708/*
1709 * Replace a single strip (tile) of uncompressed data by
1710 * multiple strips (tiles), each approximately 8Kbytes.
1711 * This is useful for dealing with large images or
1712 * for dealing with machines with a limited amount
1713 * memory.
1714 */
1715static void
1716ChopUpSingleUncompressedStrip(TIFF* tif)
1717{
1718 register TIFFDirectory *td = &tif->tif_dir;
1719 uint32 bytecount = td->td_stripbytecount[0];
1720 uint32 offset = td->td_stripoffset[0];
1721 tsize_t rowbytes = TIFFVTileSize(tif, 1), stripbytes;
1722 tstrip_t strip, nstrips, rowsperstrip;
1723 uint32* newcounts;
1724 uint32* newoffsets;
1725
1726 /*
1727 * Make the rows hold at least one scanline, but fill specified amount
1728 * of data if possible.
1729 */
1730 if (rowbytes > STRIP_SIZE_DEFAULT) {
1731 stripbytes = rowbytes;
1732 rowsperstrip = 1;
1733 } else if (rowbytes > 0 ) {
1734 rowsperstrip = STRIP_SIZE_DEFAULT / rowbytes;
1735 stripbytes = rowbytes * rowsperstrip;
1736 }
1737 else
1738 return;
1739
1740 /*
1741 * never increase the number of strips in an image
1742 */
1743 if (rowsperstrip >= td->td_rowsperstrip)
1744 return;
1745 nstrips = (tstrip_t) TIFFhowmany(bytecount, stripbytes);
1746 if( nstrips == 0 ) /* something is wonky, do nothing. */
1747 return;
1748
1749 newcounts = (uint32*) _TIFFCheckMalloc(tif, nstrips, sizeof (uint32),
1750 "for chopped \"StripByteCounts\" array");
1751 newoffsets = (uint32*) _TIFFCheckMalloc(tif, nstrips, sizeof (uint32),
1752 "for chopped \"StripOffsets\" array");
1753 if (newcounts == NULL || newoffsets == NULL) {
1754 /*
1755 * Unable to allocate new strip information, give
1756 * up and use the original one strip information.
1757 */
1758 if (newcounts != NULL)
1759 _TIFFfree(newcounts);
1760 if (newoffsets != NULL)
1761 _TIFFfree(newoffsets);
1762 return;
1763 }
1764 /*
1765 * Fill the strip information arrays with new bytecounts and offsets
1766 * that reflect the broken-up format.
1767 */
1768 for (strip = 0; strip < nstrips; strip++) {
1769 if (stripbytes > (tsize_t) bytecount)
1770 stripbytes = bytecount;
1771 newcounts[strip] = stripbytes;
1772 newoffsets[strip] = offset;
1773 offset += stripbytes;
1774 bytecount -= stripbytes;
1775 }
1776 /*
1777 * Replace old single strip info with multi-strip info.
1778 */
1779 td->td_stripsperimage = td->td_nstrips = nstrips;
1780 TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
1781
1782 _TIFFfree(td->td_stripbytecount);
1783 _TIFFfree(td->td_stripoffset);
1784 td->td_stripbytecount = newcounts;
1785 td->td_stripoffset = newoffsets;
1786 td->td_stripbytecountsorted = 1;
1787}
1788
1789/* vim: set ts=8 sts=8 sw=8 noet: */
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