File: tif_dir.c

package info (click to toggle)
gamera 1:3.4.2+git20160808.1725654-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 22,312 kB
  • ctags: 24,991
  • sloc: xml: 122,324; ansic: 52,869; cpp: 50,664; python: 35,034; makefile: 118; sh: 101
file content (1304 lines) | stat: -rw-r--r-- 36,577 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
/* $Header$ */

/*
 * Copyright (c) 1988-1997 Sam Leffler
 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * all copies of the software and related documentation, and (ii) the names of
 * Sam Leffler and Silicon Graphics may not be used in any advertising or
 * publicity relating to the software without the specific, prior written
 * permission of Sam Leffler and Silicon Graphics.
 * 
 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
 * 
 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
 * OF THIS SOFTWARE.
 */

/*
 * TIFF Library.
 *
 * Directory Tag Get & Set Routines.
 * (and also some miscellaneous stuff)
 */
#include "tiffiop.h"

/*
 * These are used in the backwards compatibility code...
 */
#define DATATYPE_VOID		0       /* !untyped data */
#define DATATYPE_INT		1       /* !signed integer data */
#define DATATYPE_UINT		2       /* !unsigned integer data */
#define DATATYPE_IEEEFP		3       /* !IEEE floating point data */

void
_TIFFsetByteArray(void** vpp, void* vp, long n)
{
	if (*vpp)
		_TIFFfree(*vpp), *vpp = 0;
	if (vp && (*vpp = (void*) _TIFFmalloc(n)))
		_TIFFmemcpy(*vpp, vp, n);
}
void _TIFFsetString(char** cpp, char* cp)
    { _TIFFsetByteArray((void**) cpp, (void*) cp, (long) (strlen(cp)+1)); }
void _TIFFsetNString(char** cpp, char* cp, long n)
    { _TIFFsetByteArray((void**) cpp, (void*) cp, n); }
void _TIFFsetShortArray(uint16** wpp, uint16* wp, long n)
    { _TIFFsetByteArray((void**) wpp, (void*) wp, n*sizeof (uint16)); }
void _TIFFsetLongArray(uint32** lpp, uint32* lp, long n)
    { _TIFFsetByteArray((void**) lpp, (void*) lp, n*sizeof (uint32)); }
void _TIFFsetFloatArray(float** fpp, float* fp, long n)
    { _TIFFsetByteArray((void**) fpp, (void*) fp, n*sizeof (float)); }
void _TIFFsetDoubleArray(double** dpp, double* dp, long n)
    { _TIFFsetByteArray((void**) dpp, (void*) dp, n*sizeof (double)); }

/*
 * Install extra samples information.
 */
static int
setExtraSamples(TIFFDirectory* td, va_list ap, int* v)
{
	uint16* va;
	int i;

	*v = va_arg(ap, int);
	if ((uint16) *v > td->td_samplesperpixel)
		return (0);
	va = va_arg(ap, uint16*);
	if (*v > 0 && va == NULL)		/* typically missing param */
		return (0);
	for (i = 0; i < *v; i++)
		if (va[i] > EXTRASAMPLE_UNASSALPHA)
			return (0);
	td->td_extrasamples = (uint16) *v;
	_TIFFsetShortArray(&td->td_sampleinfo, va, td->td_extrasamples);
	return (1);
}

#ifdef CMYK_SUPPORT
static int
checkInkNamesString(TIFF* tif, int slen, const char* s)
{
	TIFFDirectory* td = &tif->tif_dir;
	int i = td->td_samplesperpixel;

	if (slen > 0) {
		const char* ep = s+slen;
		const char* cp = s;
		for (; i > 0; i--) {
			for (; *cp != '\0'; cp++)
				if (cp >= ep)
					goto bad;
			cp++;				/* skip \0 */
		}
		return (cp-s);
	}
bad:
	TIFFError("TIFFSetField",
	    "%s: Invalid InkNames value; expecting %d names, found %d",
	    tif->tif_name,
	    td->td_samplesperpixel,
	    td->td_samplesperpixel-i);
	return (0);
}
#endif

static int
_TIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)
{
	TIFFDirectory* td = &tif->tif_dir;
	int status = 1;
	uint32 v32;
	int i, v;
	double d;
	char* s;

	switch (tag) {
	case TIFFTAG_SUBFILETYPE:
		td->td_subfiletype = va_arg(ap, uint32);
		break;
	case TIFFTAG_IMAGEWIDTH:
		td->td_imagewidth = va_arg(ap, uint32);
		break;
	case TIFFTAG_IMAGELENGTH:
		td->td_imagelength = va_arg(ap, uint32);
		break;
	case TIFFTAG_BITSPERSAMPLE:
		td->td_bitspersample = (uint16) va_arg(ap, int);
		/*
		 * If the data require post-decoding processing
		 * to byte-swap samples, set it up here.  Note
		 * that since tags are required to be ordered,
		 * compression code can override this behaviour
		 * in the setup method if it wants to roll the
		 * post decoding work in with its normal work.
		 */
		if (tif->tif_flags & TIFF_SWAB) {
			if (td->td_bitspersample == 16)
				tif->tif_postdecode = _TIFFSwab16BitData;
			else if (td->td_bitspersample == 32)
				tif->tif_postdecode = _TIFFSwab32BitData;
			else if (td->td_bitspersample == 64)
				tif->tif_postdecode = _TIFFSwab64BitData;
		}
		break;
	case TIFFTAG_COMPRESSION:
		v = va_arg(ap, int) & 0xffff;
		/*
		 * If we're changing the compression scheme,
		 * the notify the previous module so that it
		 * can cleanup any state it's setup.
		 */
		if (TIFFFieldSet(tif, FIELD_COMPRESSION)) {
			if (td->td_compression == v)
				break;
			(*tif->tif_cleanup)(tif);
			tif->tif_flags &= ~TIFF_CODERSETUP;
		}
		/*
		 * Setup new compression routine state.
		 */
		if( (status = TIFFSetCompressionScheme(tif, v)) != 0 )
                    td->td_compression = v;
                else
                    status = 0;
		break;
	case TIFFTAG_PHOTOMETRIC:
		td->td_photometric = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_THRESHHOLDING:
		td->td_threshholding = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_FILLORDER:
		v = va_arg(ap, int);
		if (v != FILLORDER_LSB2MSB && v != FILLORDER_MSB2LSB)
			goto badvalue;
		td->td_fillorder = (uint16) v;
		break;
	case TIFFTAG_DOCUMENTNAME:
		_TIFFsetString(&td->td_documentname, va_arg(ap, char*));
		break;
	case TIFFTAG_ARTIST:
		_TIFFsetString(&td->td_artist, va_arg(ap, char*));
		break;
	case TIFFTAG_DATETIME:
		_TIFFsetString(&td->td_datetime, va_arg(ap, char*));
		break;
	case TIFFTAG_HOSTCOMPUTER:
		_TIFFsetString(&td->td_hostcomputer, va_arg(ap, char*));
		break;
	case TIFFTAG_IMAGEDESCRIPTION:
		_TIFFsetString(&td->td_imagedescription, va_arg(ap, char*));
		break;
	case TIFFTAG_MAKE:
		_TIFFsetString(&td->td_make, va_arg(ap, char*));
		break;
	case TIFFTAG_MODEL:
		_TIFFsetString(&td->td_model, va_arg(ap, char*));
		break;
	case TIFFTAG_SOFTWARE:
		_TIFFsetString(&td->td_software, va_arg(ap, char*));
		break;
	case TIFFTAG_COPYRIGHT:
		_TIFFsetString(&td->td_copyright, va_arg(ap, char*));
		break;
	case TIFFTAG_ORIENTATION:
		v = va_arg(ap, int);
		if (v < ORIENTATION_TOPLEFT || ORIENTATION_LEFTBOT < v) {
			TIFFWarning(tif->tif_name,
			    "Bad value %ld for \"%s\" tag ignored",
			    v, _TIFFFieldWithTag(tif, tag)->field_name);
		} else
			td->td_orientation = (uint16) v;
		break;
	case TIFFTAG_SAMPLESPERPIXEL:
		/* XXX should cross check -- e.g. if pallette, then 1 */
		v = va_arg(ap, int);
		if (v == 0)
			goto badvalue;
		td->td_samplesperpixel = (uint16) v;
		break;
	case TIFFTAG_ROWSPERSTRIP:
		v32 = va_arg(ap, uint32);
		if (v32 == 0)
			goto badvalue32;
		td->td_rowsperstrip = v32;
		if (!TIFFFieldSet(tif, FIELD_TILEDIMENSIONS)) {
			td->td_tilelength = v32;
			td->td_tilewidth = td->td_imagewidth;
		}
		break;
	case TIFFTAG_MINSAMPLEVALUE:
		td->td_minsamplevalue = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_MAXSAMPLEVALUE:
		td->td_maxsamplevalue = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_SMINSAMPLEVALUE:
		td->td_sminsamplevalue = (double) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_SMAXSAMPLEVALUE:
		td->td_smaxsamplevalue = (double) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_XRESOLUTION:
		td->td_xresolution = (float) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_YRESOLUTION:
		td->td_yresolution = (float) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_PLANARCONFIG:
		v = va_arg(ap, int);
		if (v != PLANARCONFIG_CONTIG && v != PLANARCONFIG_SEPARATE)
			goto badvalue;
		td->td_planarconfig = (uint16) v;
		break;
	case TIFFTAG_PAGENAME:
		_TIFFsetString(&td->td_pagename, va_arg(ap, char*));
		break;
	case TIFFTAG_XPOSITION:
		td->td_xposition = (float) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_YPOSITION:
		td->td_yposition = (float) va_arg(ap, dblparam_t);
		break;
	case TIFFTAG_RESOLUTIONUNIT:
		v = va_arg(ap, int);
		if (v < RESUNIT_NONE || RESUNIT_CENTIMETER < v)
			goto badvalue;
		td->td_resolutionunit = (uint16) v;
		break;
	case TIFFTAG_PAGENUMBER:
		td->td_pagenumber[0] = (uint16) va_arg(ap, int);
		td->td_pagenumber[1] = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_HALFTONEHINTS:
		td->td_halftonehints[0] = (uint16) va_arg(ap, int);
		td->td_halftonehints[1] = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_COLORMAP:
		v32 = (uint32)(1L<<td->td_bitspersample);
		_TIFFsetShortArray(&td->td_colormap[0], va_arg(ap, uint16*), v32);
		_TIFFsetShortArray(&td->td_colormap[1], va_arg(ap, uint16*), v32);
		_TIFFsetShortArray(&td->td_colormap[2], va_arg(ap, uint16*), v32);
		break;
	case TIFFTAG_EXTRASAMPLES:
		if (!setExtraSamples(td, ap, &v))
			goto badvalue;
		break;
	case TIFFTAG_MATTEING:
		td->td_extrasamples = (uint16) (va_arg(ap, int) != 0);
		if (td->td_extrasamples) {
			uint16 sv = EXTRASAMPLE_ASSOCALPHA;
			_TIFFsetShortArray(&td->td_sampleinfo, &sv, 1);
		}
		break;
	case TIFFTAG_TILEWIDTH:
		v32 = va_arg(ap, uint32);
		if (v32 % 16) {
			if (tif->tif_mode != O_RDONLY)
				goto badvalue32;
			TIFFWarning(tif->tif_name,
			    "Nonstandard tile width %d, convert file", v32);
		}
		td->td_tilewidth = v32;
		tif->tif_flags |= TIFF_ISTILED;
		break;
	case TIFFTAG_TILELENGTH:
		v32 = va_arg(ap, uint32);
		if (v32 % 16) {
			if (tif->tif_mode != O_RDONLY)
				goto badvalue32;
			TIFFWarning(tif->tif_name,
			    "Nonstandard tile length %d, convert file", v32);
		}
		td->td_tilelength = v32;
		tif->tif_flags |= TIFF_ISTILED;
		break;
	case TIFFTAG_TILEDEPTH:
		v32 = va_arg(ap, uint32);
		if (v32 == 0)
			goto badvalue32;
		td->td_tiledepth = v32;
		break;
	case TIFFTAG_DATATYPE:
		v = va_arg(ap, int);
		switch (v) {
		case DATATYPE_VOID:	v = SAMPLEFORMAT_VOID;	break;
		case DATATYPE_INT:	v = SAMPLEFORMAT_INT;	break;
		case DATATYPE_UINT:	v = SAMPLEFORMAT_UINT;	break;
		case DATATYPE_IEEEFP:	v = SAMPLEFORMAT_IEEEFP;break;
		default:		goto badvalue;
		}
		td->td_sampleformat = (uint16) v;
		break;
	case TIFFTAG_SAMPLEFORMAT:
		v = va_arg(ap, int);
		if (v < SAMPLEFORMAT_UINT || SAMPLEFORMAT_COMPLEXIEEEFP < v)
			goto badvalue;
		td->td_sampleformat = (uint16) v;
		break;
	case TIFFTAG_IMAGEDEPTH:
		td->td_imagedepth = va_arg(ap, uint32);
		break;
	case TIFFTAG_STONITS:
		d = va_arg(ap, dblparam_t);
		if (d <= 0.)
			goto badvaluedbl;
		td->td_stonits = d;
		break;

	/* Begin Pixar Tags */
 	case TIFFTAG_PIXAR_IMAGEFULLWIDTH:
 		td->td_imagefullwidth = va_arg(ap, uint32);
 		break;
 	case TIFFTAG_PIXAR_IMAGEFULLLENGTH:
 		td->td_imagefulllength = va_arg(ap, uint32);
 		break;
 	case TIFFTAG_PIXAR_TEXTUREFORMAT:
 		_TIFFsetString(&td->td_textureformat, va_arg(ap, char*));
 		break;
 	case TIFFTAG_PIXAR_WRAPMODES:
 		_TIFFsetString(&td->td_wrapmodes, va_arg(ap, char*));
 		break;
 	case TIFFTAG_PIXAR_FOVCOT:
 		td->td_fovcot = (float) va_arg(ap, dblparam_t);
 		break;
 	case TIFFTAG_PIXAR_MATRIX_WORLDTOSCREEN:
 		_TIFFsetFloatArray(&td->td_matrixWorldToScreen,
 			va_arg(ap, float*), 16);
 		break;
 	case TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA:
 		_TIFFsetFloatArray(&td->td_matrixWorldToCamera,
 			va_arg(ap, float*), 16);
 		break;
 	/* End Pixar Tags */	       

#if SUBIFD_SUPPORT
	case TIFFTAG_SUBIFD:
		if ((tif->tif_flags & TIFF_INSUBIFD) == 0) {
			td->td_nsubifd = (uint16) va_arg(ap, int);
			_TIFFsetLongArray(&td->td_subifd, va_arg(ap, uint32*),
			    (long) td->td_nsubifd);
		} else {
			TIFFError(tif->tif_name, "Sorry, cannot nest SubIFDs");
			status = 0;
		}
		break;
#endif
#ifdef YCBCR_SUPPORT
	case TIFFTAG_YCBCRCOEFFICIENTS:
		_TIFFsetFloatArray(&td->td_ycbcrcoeffs, va_arg(ap, float*), 3);
		break;
	case TIFFTAG_YCBCRPOSITIONING:
		td->td_ycbcrpositioning = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_YCBCRSUBSAMPLING:
		td->td_ycbcrsubsampling[0] = (uint16) va_arg(ap, int);
		td->td_ycbcrsubsampling[1] = (uint16) va_arg(ap, int);
		break;
#endif
#ifdef COLORIMETRY_SUPPORT
	case TIFFTAG_WHITEPOINT:
		_TIFFsetFloatArray(&td->td_whitepoint, va_arg(ap, float*), 2);
		break;
	case TIFFTAG_PRIMARYCHROMATICITIES:
		_TIFFsetFloatArray(&td->td_primarychromas, va_arg(ap, float*), 6);
		break;
	case TIFFTAG_TRANSFERFUNCTION:
		v = (td->td_samplesperpixel - td->td_extrasamples) > 1 ? 3 : 1;
		for (i = 0; i < v; i++)
			_TIFFsetShortArray(&td->td_transferfunction[i],
			    va_arg(ap, uint16*), 1L<<td->td_bitspersample);
		break;
	case TIFFTAG_REFERENCEBLACKWHITE:
		/* XXX should check for null range */
		_TIFFsetFloatArray(&td->td_refblackwhite, va_arg(ap, float*), 6);
		break;
#endif
#ifdef CMYK_SUPPORT
	case TIFFTAG_INKSET:
		td->td_inkset = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_DOTRANGE:
		/* XXX should check for null range */
		td->td_dotrange[0] = (uint16) va_arg(ap, int);
		td->td_dotrange[1] = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_INKNAMES:
		i = va_arg(ap, int);
		s = va_arg(ap, char*);
		i = checkInkNamesString(tif, i, s);
                status = i > 0;
		if( i > 0 ) {
			_TIFFsetNString(&td->td_inknames, s, i);
			td->td_inknameslen = i;
		}
		break;
	case TIFFTAG_NUMBEROFINKS:
		td->td_ninks = (uint16) va_arg(ap, int);
		break;
	case TIFFTAG_TARGETPRINTER:
		_TIFFsetString(&td->td_targetprinter, va_arg(ap, char*));
		break;
#endif
#ifdef ICC_SUPPORT
	case TIFFTAG_ICCPROFILE:
		td->td_profileLength = (uint32) va_arg(ap, uint32);
		_TIFFsetByteArray(&td->td_profileData, va_arg(ap, void*),
		    td->td_profileLength);
		break;
#endif
#ifdef PHOTOSHOP_SUPPORT
 	case TIFFTAG_PHOTOSHOP:
  		td->td_photoshopLength = (uint32) va_arg(ap, uint32);
  		_TIFFsetByteArray (&td->td_photoshopData, va_arg(ap, void*),
 			td->td_photoshopLength);
 		break;
#endif
#ifdef IPTC_SUPPORT
    case TIFFTAG_RICHTIFFIPTC: 
  		td->td_richtiffiptcLength = (uint32) va_arg(ap, uint32);
#ifdef PHOTOSHOP_SUPPORT
  		_TIFFsetLongArray ((uint32**)&td->td_richtiffiptcData, va_arg(ap, uint32*),
 			td->td_richtiffiptcLength);
#else
  		_TIFFsetByteArray (&td->td_photoshopData, va_arg(ap, void*),
 			td->td_photoshopLength);
#endif
 		break;
#endif
	default:
		/*
		 * This can happen if multiple images are open with
		 * different codecs which have private tags.  The
		 * global tag information table may then have tags
		 * that are valid for one file but not the other. 
		 * If the client tries to set a tag that is not valid
		 * for the image's codec then we'll arrive here.  This
		 * happens, for example, when tiffcp is used to convert
		 * between compression schemes and codec-specific tags
		 * are blindly copied.
		 */
		TIFFError("TIFFSetField",
		    "%s: Invalid %stag \"%s\" (not supported by codec)",
		    tif->tif_name, isPseudoTag(tag) ? "pseduo-" : "",
		    _TIFFFieldWithTag(tif, tag)->field_name);
		status = 0;
		break;
	}
	if (status) {
		TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
		tif->tif_flags |= TIFF_DIRTYDIRECT;
	}
	va_end(ap);
	return (status);
badvalue:
	TIFFError(tif->tif_name, "%d: Bad value for \"%s\"", v,
	    _TIFFFieldWithTag(tif, tag)->field_name);
	va_end(ap);
	return (0);
badvalue32:
	TIFFError(tif->tif_name, "%ld: Bad value for \"%s\"", v32,
	    _TIFFFieldWithTag(tif, tag)->field_name);
	va_end(ap);
	return (0);
badvaluedbl:
	TIFFError(tif->tif_name, "%f: Bad value for \"%s\"", d,
	    _TIFFFieldWithTag(tif, tag)->field_name);
	va_end(ap);
	return (0);
}

/*
 * Return 1/0 according to whether or not
 * it is permissible to set the tag's value.
 * Note that we allow ImageLength to be changed
 * so that we can append and extend to images.
 * Any other tag may not be altered once writing
 * has commenced, unless its value has no effect
 * on the format of the data that is written.
 */
static int
OkToChangeTag(TIFF* tif, ttag_t tag)
{
	const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
	if (!fip) {			/* unknown tag */
		TIFFError("TIFFSetField", "%s: Unknown %stag %u",
		    tif->tif_name, isPseudoTag(tag) ? "pseudo-" : "", tag);
		return (0);
	}
	if (tag != TIFFTAG_IMAGELENGTH && (tif->tif_flags & TIFF_BEENWRITING) &&
	    !fip->field_oktochange) {
		/*
		 * Consult info table to see if tag can be changed
		 * after we've started writing.  We only allow changes
		 * to those tags that don't/shouldn't affect the
		 * compression and/or format of the data.
		 */
		TIFFError("TIFFSetField",
		    "%s: Cannot modify tag \"%s\" while writing",
		    tif->tif_name, fip->field_name);
		return (0);
	}
	return (1);
}

/*
 * Record the value of a field in the
 * internal directory structure.  The
 * field will be written to the file
 * when/if the directory structure is
 * updated.
 */
int
TIFFSetField(TIFF* tif, ttag_t tag, ...)
{
	va_list ap;
	int status;

	va_start(ap, tag);
	status = TIFFVSetField(tif, tag, ap);
	va_end(ap);
	return (status);
}

/*
 * Like TIFFSetField, but taking a varargs
 * parameter list.  This routine is useful
 * for building higher-level interfaces on
 * top of the library.
 */
int
TIFFVSetField(TIFF* tif, ttag_t tag, va_list ap)
{
	return OkToChangeTag(tif, tag) ?
	    (*tif->tif_vsetfield)(tif, tag, ap) : 0;
}

static int
_TIFFVGetField(TIFF* tif, ttag_t tag, va_list ap)
{
	TIFFDirectory* td = &tif->tif_dir;

	switch (tag) {
	case TIFFTAG_SUBFILETYPE:
		*va_arg(ap, uint32*) = td->td_subfiletype;
		break;
	case TIFFTAG_IMAGEWIDTH:
		*va_arg(ap, uint32*) = td->td_imagewidth;
		break;
	case TIFFTAG_IMAGELENGTH:
		*va_arg(ap, uint32*) = td->td_imagelength;
		break;
	case TIFFTAG_BITSPERSAMPLE:
		*va_arg(ap, uint16*) = td->td_bitspersample;
		break;
	case TIFFTAG_COMPRESSION:
		*va_arg(ap, uint16*) = td->td_compression;
		break;
	case TIFFTAG_PHOTOMETRIC:
		*va_arg(ap, uint16*) = td->td_photometric;
		break;
	case TIFFTAG_THRESHHOLDING:
		*va_arg(ap, uint16*) = td->td_threshholding;
		break;
	case TIFFTAG_FILLORDER:
		*va_arg(ap, uint16*) = td->td_fillorder;
		break;
	case TIFFTAG_DOCUMENTNAME:
		*va_arg(ap, char**) = td->td_documentname;
		break;
	case TIFFTAG_ARTIST:
		*va_arg(ap, char**) = td->td_artist;
		break;
	case TIFFTAG_DATETIME:
		*va_arg(ap, char**) = td->td_datetime;
		break;
	case TIFFTAG_HOSTCOMPUTER:
		*va_arg(ap, char**) = td->td_hostcomputer;
		break;
	case TIFFTAG_IMAGEDESCRIPTION:
		*va_arg(ap, char**) = td->td_imagedescription;
		break;
	case TIFFTAG_MAKE:
		*va_arg(ap, char**) = td->td_make;
		break;
	case TIFFTAG_MODEL:
		*va_arg(ap, char**) = td->td_model;
		break;
	case TIFFTAG_SOFTWARE:
		*va_arg(ap, char**) = td->td_software;
		break;
	case TIFFTAG_COPYRIGHT:
		*va_arg(ap, char**) = td->td_copyright;
		break;
	case TIFFTAG_ORIENTATION:
		*va_arg(ap, uint16*) = td->td_orientation;
		break;
	case TIFFTAG_SAMPLESPERPIXEL:
		*va_arg(ap, uint16*) = td->td_samplesperpixel;
		break;
	case TIFFTAG_ROWSPERSTRIP:
		*va_arg(ap, uint32*) = td->td_rowsperstrip;
		break;
	case TIFFTAG_MINSAMPLEVALUE:
		*va_arg(ap, uint16*) = td->td_minsamplevalue;
		break;
	case TIFFTAG_MAXSAMPLEVALUE:
		*va_arg(ap, uint16*) = td->td_maxsamplevalue;
		break;
	case TIFFTAG_SMINSAMPLEVALUE:
		*va_arg(ap, double*) = td->td_sminsamplevalue;
		break;
	case TIFFTAG_SMAXSAMPLEVALUE:
		*va_arg(ap, double*) = td->td_smaxsamplevalue;
		break;
	case TIFFTAG_XRESOLUTION:
		*va_arg(ap, float*) = td->td_xresolution;
		break;
	case TIFFTAG_YRESOLUTION:
		*va_arg(ap, float*) = td->td_yresolution;
		break;
	case TIFFTAG_PLANARCONFIG:
		*va_arg(ap, uint16*) = td->td_planarconfig;
		break;
	case TIFFTAG_XPOSITION:
		*va_arg(ap, float*) = td->td_xposition;
		break;
	case TIFFTAG_YPOSITION:
		*va_arg(ap, float*) = td->td_yposition;
		break;
	case TIFFTAG_PAGENAME:
		*va_arg(ap, char**) = td->td_pagename;
		break;
	case TIFFTAG_RESOLUTIONUNIT:
		*va_arg(ap, uint16*) = td->td_resolutionunit;
		break;
	case TIFFTAG_PAGENUMBER:
		*va_arg(ap, uint16*) = td->td_pagenumber[0];
		*va_arg(ap, uint16*) = td->td_pagenumber[1];
		break;
	case TIFFTAG_HALFTONEHINTS:
		*va_arg(ap, uint16*) = td->td_halftonehints[0];
		*va_arg(ap, uint16*) = td->td_halftonehints[1];
		break;
	case TIFFTAG_COLORMAP:
		*va_arg(ap, uint16**) = td->td_colormap[0];
		*va_arg(ap, uint16**) = td->td_colormap[1];
		*va_arg(ap, uint16**) = td->td_colormap[2];
		break;
	case TIFFTAG_STRIPOFFSETS:
	case TIFFTAG_TILEOFFSETS:
		*va_arg(ap, uint32**) = td->td_stripoffset;
		break;
	case TIFFTAG_STRIPBYTECOUNTS:
	case TIFFTAG_TILEBYTECOUNTS:
		*va_arg(ap, uint32**) = td->td_stripbytecount;
		break;
	case TIFFTAG_MATTEING:
		*va_arg(ap, uint16*) =
		    (td->td_extrasamples == 1 &&
		     td->td_sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA);
		break;
	case TIFFTAG_EXTRASAMPLES:
		*va_arg(ap, uint16*) = td->td_extrasamples;
		*va_arg(ap, uint16**) = td->td_sampleinfo;
		break;
	case TIFFTAG_TILEWIDTH:
		*va_arg(ap, uint32*) = td->td_tilewidth;
		break;
	case TIFFTAG_TILELENGTH:
		*va_arg(ap, uint32*) = td->td_tilelength;
		break;
	case TIFFTAG_TILEDEPTH:
		*va_arg(ap, uint32*) = td->td_tiledepth;
		break;
	case TIFFTAG_DATATYPE:
		switch (td->td_sampleformat) {
		case SAMPLEFORMAT_UINT:
			*va_arg(ap, uint16*) = DATATYPE_UINT;
			break;
		case SAMPLEFORMAT_INT:
			*va_arg(ap, uint16*) = DATATYPE_INT;
			break;
		case SAMPLEFORMAT_IEEEFP:
			*va_arg(ap, uint16*) = DATATYPE_IEEEFP;
			break;
		case SAMPLEFORMAT_VOID:
			*va_arg(ap, uint16*) = DATATYPE_VOID;
			break;
		}
		break;
	case TIFFTAG_SAMPLEFORMAT:
		*va_arg(ap, uint16*) = td->td_sampleformat;
		break;
	case TIFFTAG_IMAGEDEPTH:
		*va_arg(ap, uint32*) = td->td_imagedepth;
		break;
	case TIFFTAG_STONITS:
		*va_arg(ap, double*) = td->td_stonits;
		break;
#if SUBIFD_SUPPORT
	case TIFFTAG_SUBIFD:
		*va_arg(ap, uint16*) = td->td_nsubifd;
		*va_arg(ap, uint32**) = td->td_subifd;
		break;
#endif
#ifdef YCBCR_SUPPORT
	case TIFFTAG_YCBCRCOEFFICIENTS:
		*va_arg(ap, float**) = td->td_ycbcrcoeffs;
		break;
	case TIFFTAG_YCBCRPOSITIONING:
		*va_arg(ap, uint16*) = td->td_ycbcrpositioning;
		break;
	case TIFFTAG_YCBCRSUBSAMPLING:
		*va_arg(ap, uint16*) = td->td_ycbcrsubsampling[0];
		*va_arg(ap, uint16*) = td->td_ycbcrsubsampling[1];
		break;
#endif
#ifdef COLORIMETRY_SUPPORT
	case TIFFTAG_WHITEPOINT:
		*va_arg(ap, float**) = td->td_whitepoint;
		break;
	case TIFFTAG_PRIMARYCHROMATICITIES:
		*va_arg(ap, float**) = td->td_primarychromas;
		break;
	case TIFFTAG_TRANSFERFUNCTION:
		*va_arg(ap, uint16**) = td->td_transferfunction[0];
		if (td->td_samplesperpixel - td->td_extrasamples > 1) {
			*va_arg(ap, uint16**) = td->td_transferfunction[1];
			*va_arg(ap, uint16**) = td->td_transferfunction[2];
		}
		break;
	case TIFFTAG_REFERENCEBLACKWHITE:
		*va_arg(ap, float**) = td->td_refblackwhite;
		break;
#endif
#ifdef CMYK_SUPPORT
	case TIFFTAG_INKSET:
		*va_arg(ap, uint16*) = td->td_inkset;
		break;
	case TIFFTAG_DOTRANGE:
		*va_arg(ap, uint16*) = td->td_dotrange[0];
		*va_arg(ap, uint16*) = td->td_dotrange[1];
		break;
	case TIFFTAG_INKNAMES:
		*va_arg(ap, char**) = td->td_inknames;
		break;
	case TIFFTAG_NUMBEROFINKS:
		*va_arg(ap, uint16*) = td->td_ninks;
		break;
	case TIFFTAG_TARGETPRINTER:
		*va_arg(ap, char**) = td->td_targetprinter;
		break;
#endif
#ifdef ICC_SUPPORT
	case TIFFTAG_ICCPROFILE:
		*va_arg(ap, uint32*) = td->td_profileLength;
		*va_arg(ap, void**) = td->td_profileData;
		break;
#endif
#ifdef PHOTOSHOP_SUPPORT
 	case TIFFTAG_PHOTOSHOP:
 		*va_arg(ap, uint32*) = td->td_photoshopLength;
 		*va_arg(ap, void**) = td->td_photoshopData;
 		break;
#endif
#ifdef IPTC_SUPPORT
 	case TIFFTAG_RICHTIFFIPTC:
 		*va_arg(ap, uint32*) = td->td_richtiffiptcLength;
 		*va_arg(ap, void**) = td->td_richtiffiptcData;
 		break;
#endif
 	/* Begin Pixar Tags */
 	case TIFFTAG_PIXAR_IMAGEFULLWIDTH:
 		*va_arg(ap, uint32*) = td->td_imagefullwidth;
 		break;
 	case TIFFTAG_PIXAR_IMAGEFULLLENGTH:
 		*va_arg(ap, uint32*) = td->td_imagefulllength;
 		break;
 	case TIFFTAG_PIXAR_TEXTUREFORMAT:
 		*va_arg(ap, char**) = td->td_textureformat;
 		break;
 	case TIFFTAG_PIXAR_WRAPMODES:
 		*va_arg(ap, char**) = td->td_wrapmodes;
 		break;
 	case TIFFTAG_PIXAR_FOVCOT:
 		*va_arg(ap, float*) = td->td_fovcot;
 		break;
 	case TIFFTAG_PIXAR_MATRIX_WORLDTOSCREEN:
 		*va_arg(ap, float**) = td->td_matrixWorldToScreen;
 		break;
 	case TIFFTAG_PIXAR_MATRIX_WORLDTOCAMERA:
 		*va_arg(ap, float**) = td->td_matrixWorldToCamera;
 		break;
 	/* End Pixar Tags */

	default:
		/*
		 * This can happen if multiple images are open with
		 * different codecs which have private tags.  The
		 * global tag information table may then have tags
		 * that are valid for one file but not the other. 
		 * If the client tries to get a tag that is not valid
		 * for the image's codec then we'll arrive here.
		 */
		TIFFError("TIFFGetField",
		    "%s: Invalid %stag \"%s\" (not supported by codec)",
		    tif->tif_name, isPseudoTag(tag) ? "pseudo-" : "",
		    _TIFFFieldWithTag(tif, tag)->field_name);
		break;
	}
	return (1);
}

/*
 * Return the value of a field in the
 * internal directory structure.
 */
int
TIFFGetField(TIFF* tif, ttag_t tag, ...)
{
	int status;
	va_list ap;

	va_start(ap, tag);
	status = TIFFVGetField(tif, tag, ap);
	va_end(ap);
	return (status);
}

/*
 * Like TIFFGetField, but taking a varargs
 * parameter list.  This routine is useful
 * for building higher-level interfaces on
 * top of the library.
 */
int
TIFFVGetField(TIFF* tif, ttag_t tag, va_list ap)
{
	const TIFFFieldInfo* fip = _TIFFFindFieldInfo(tif, tag, TIFF_ANY);
	return (fip && (isPseudoTag(tag) || TIFFFieldSet(tif, fip->field_bit)) ?
	    (*tif->tif_vgetfield)(tif, tag, ap) : 0);
}

#define	CleanupField(member) {		\
    if (td->member) {			\
	_TIFFfree(td->member);		\
	td->member = 0;			\
    }					\
}

/*
 * Release storage associated with a directory.
 */
void
TIFFFreeDirectory(TIFF* tif)
{
	register TIFFDirectory *td = &tif->tif_dir;

	CleanupField(td_colormap[0]);
	CleanupField(td_colormap[1]);
	CleanupField(td_colormap[2]);
	CleanupField(td_documentname);
	CleanupField(td_artist);
	CleanupField(td_datetime);
	CleanupField(td_hostcomputer);
	CleanupField(td_imagedescription);
	CleanupField(td_make);
	CleanupField(td_model);
	CleanupField(td_software);
	CleanupField(td_copyright);
	CleanupField(td_pagename);
	CleanupField(td_sampleinfo);
#if SUBIFD_SUPPORT
	CleanupField(td_subifd);
#endif
#ifdef YCBCR_SUPPORT
	CleanupField(td_ycbcrcoeffs);
#endif
#ifdef CMYK_SUPPORT
	CleanupField(td_inknames);
	CleanupField(td_targetprinter);
#endif
#ifdef COLORIMETRY_SUPPORT
	CleanupField(td_whitepoint);
	CleanupField(td_primarychromas);
	CleanupField(td_refblackwhite);
	CleanupField(td_transferfunction[0]);
	CleanupField(td_transferfunction[1]);
	CleanupField(td_transferfunction[2]);
#endif
#ifdef ICC_SUPPORT
	CleanupField(td_profileData);
#endif
#ifdef PHOTOSHOP_SUPPORT
	CleanupField(td_photoshopData);
#endif
#ifdef IPTC_SUPPORT
	CleanupField(td_richtiffiptcData);
#endif
	CleanupField(td_stripoffset);
	CleanupField(td_stripbytecount);
 	/* Begin Pixar Tags */
 	CleanupField(td_textureformat);
 	CleanupField(td_wrapmodes);
 	CleanupField(td_matrixWorldToScreen);
 	CleanupField(td_matrixWorldToCamera);
 	/* End Pixar Tags */
}
#undef CleanupField

/*
 * Client Tag extension support (from Niles Ritter).
 */
static TIFFExtendProc _TIFFextender = (TIFFExtendProc) NULL;

TIFFExtendProc
TIFFSetTagExtender(TIFFExtendProc extender)
{
	TIFFExtendProc prev = _TIFFextender;
	_TIFFextender = extender;
	return (prev);
}

/*
 * Setup for a new directory.  Should we automatically call
 * TIFFWriteDirectory() if the current one is dirty?
 *
 * The newly created directory will not exist on the file till
 * TIFFWriteDirectory(), TIFFFlush() or TIFFClose() is called.
 */
int
TIFFCreateDirectory(TIFF* tif)
{
    TIFFDefaultDirectory(tif);
    tif->tif_diroff = 0;
    tif->tif_nextdiroff = 0;
    tif->tif_curoff = 0;
    tif->tif_row = (uint32) -1;
    tif->tif_curstrip = (tstrip_t) -1;

    return 0;
}

/*
 * Setup a default directory structure.
 */
int
TIFFDefaultDirectory(TIFF* tif)
{
	register TIFFDirectory* td = &tif->tif_dir;

	_TIFFSetupFieldInfo(tif);
	_TIFFmemset(td, 0, sizeof (*td));
	td->td_fillorder = FILLORDER_MSB2LSB;
	td->td_bitspersample = 1;
	td->td_threshholding = THRESHHOLD_BILEVEL;
	td->td_orientation = ORIENTATION_TOPLEFT;
	td->td_samplesperpixel = 1;
	td->td_rowsperstrip = (uint32) -1;
	td->td_tilewidth = (uint32) -1;
	td->td_tilelength = (uint32) -1;
	td->td_tiledepth = 1;
	td->td_resolutionunit = RESUNIT_INCH;
	td->td_sampleformat = SAMPLEFORMAT_UINT;
	td->td_imagedepth = 1;
#ifdef YCBCR_SUPPORT
	td->td_ycbcrsubsampling[0] = 2;
	td->td_ycbcrsubsampling[1] = 2;
	td->td_ycbcrpositioning = YCBCRPOSITION_CENTERED;
#endif
#ifdef CMYK_SUPPORT
	td->td_inkset = INKSET_CMYK;
	td->td_ninks = 4;
#endif
	tif->tif_postdecode = _TIFFNoPostDecode;
	tif->tif_vsetfield = _TIFFVSetField;
	tif->tif_vgetfield = _TIFFVGetField;
	tif->tif_printdir = NULL;
	/*
	 *  Give client code a chance to install their own
	 *  tag extensions & methods, prior to compression overloads.
	 */
	if (_TIFFextender)
		(*_TIFFextender)(tif);
	(void) TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
	/*
	 * NB: The directory is marked dirty as a result of setting
	 * up the default compression scheme.  However, this really
	 * isn't correct -- we want TIFF_DIRTYDIRECT to be set only
	 * if the user does something.  We could just do the setup
	 * by hand, but it seems better to use the normal mechanism
	 * (i.e. TIFFSetField).
	 */
	tif->tif_flags &= ~TIFF_DIRTYDIRECT;

        /*
         * As per http://bugzilla.remotesensing.org/show_bug.cgi?id=19
         * we clear the ISTILED flag when setting up a new directory.
         * Should we also be clearing stuff like INSUBIFD?
         */
        tif->tif_flags &= ~TIFF_ISTILED;

	return (1);
}

static int
TIFFAdvanceDirectory(TIFF* tif, uint32* nextdir, toff_t* off)
{
    static const char module[] = "TIFFAdvanceDirectory";
    uint16 dircount;
    if (isMapped(tif))
    {
        toff_t poff=*nextdir;
        if (poff+sizeof(uint16) > tif->tif_size)
        {
            TIFFError(module, "%s: Error fetching directory count",
                      tif->tif_name);
            return (0);
        }
        _TIFFmemcpy(&dircount, tif->tif_base+poff, sizeof (uint16));
        if (tif->tif_flags & TIFF_SWAB)
            TIFFSwabShort(&dircount);
        poff+=sizeof (uint16)+dircount*sizeof (TIFFDirEntry);
        if (off != NULL)
            *off = poff;
        if (((toff_t) (poff+sizeof (uint32))) > tif->tif_size)
        {
            TIFFError(module, "%s: Error fetching directory link",
                      tif->tif_name);
            return (0);
        }
        _TIFFmemcpy(nextdir, tif->tif_base+poff, sizeof (uint32));
        if (tif->tif_flags & TIFF_SWAB)
            TIFFSwabLong(nextdir);
        return (1);
    }
    else
    {
        if (!SeekOK(tif, *nextdir) ||
            !ReadOK(tif, &dircount, sizeof (uint16))) {
            TIFFError(module, "%s: Error fetching directory count",
                      tif->tif_name);
            return (0);
        }
        if (tif->tif_flags & TIFF_SWAB)
            TIFFSwabShort(&dircount);
        if (off != NULL)
            *off = TIFFSeekFile(tif,
                                dircount*sizeof (TIFFDirEntry), SEEK_CUR);
        else
            (void) TIFFSeekFile(tif,
                                dircount*sizeof (TIFFDirEntry), SEEK_CUR);
        if (!ReadOK(tif, nextdir, sizeof (uint32))) {
            TIFFError(module, "%s: Error fetching directory link",
                      tif->tif_name);
            return (0);
        }
        if (tif->tif_flags & TIFF_SWAB)
            TIFFSwabLong(nextdir);
        return (1);
    }
}

/*
 * Count the number of directories in a file.
 */
tdir_t
TIFFNumberOfDirectories(TIFF* tif)
{
    toff_t nextdir = tif->tif_header.tiff_diroff;
    tdir_t n = 0;
    
    while (nextdir != 0 && TIFFAdvanceDirectory(tif, &nextdir, NULL))
        n++;
    return (n);
}

/*
 * Set the n-th directory as the current directory.
 * NB: Directories are numbered starting at 0.
 */
int
TIFFSetDirectory(TIFF* tif, tdir_t dirn)
{
	toff_t nextdir;
	tdir_t n;

	nextdir = tif->tif_header.tiff_diroff;
	for (n = dirn; n > 0 && nextdir != 0; n--)
		if (!TIFFAdvanceDirectory(tif, &nextdir, NULL))
			return (0);
	tif->tif_nextdiroff = nextdir;
	/*
	 * Set curdir to the actual directory index.  The
	 * -1 is because TIFFReadDirectory will increment
	 * tif_curdir after successfully reading the directory.
	 */
	tif->tif_curdir = (dirn - n) - 1;
	return (TIFFReadDirectory(tif));
}

/*
 * Set the current directory to be the directory
 * located at the specified file offset.  This interface
 * is used mainly to access directories linked with
 * the SubIFD tag (e.g. thumbnail images).
 */
int
TIFFSetSubDirectory(TIFF* tif, uint32 diroff)
{
	tif->tif_nextdiroff = diroff;
	return (TIFFReadDirectory(tif));
}

/*
 * Return file offset of the current directory.
 */
uint32
TIFFCurrentDirOffset(TIFF* tif)
{
	return (tif->tif_diroff);
}

/*
 * Return an indication of whether or not we are
 * at the last directory in the file.
 */
int
TIFFLastDirectory(TIFF* tif)
{
	return (tif->tif_nextdiroff == 0);
}

/*
 * Unlink the specified directory from the directory chain.
 */
int
TIFFUnlinkDirectory(TIFF* tif, tdir_t dirn)
{
	static const char module[] = "TIFFUnlinkDirectory";
	toff_t nextdir;
	toff_t off;
	tdir_t n;

	if (tif->tif_mode == O_RDONLY) {
		TIFFError(module, "Can not unlink directory in read-only file");
		return (0);
	}
	/*
	 * Go to the directory before the one we want
	 * to unlink and nab the offset of the link
	 * field we'll need to patch.
	 */
	nextdir = tif->tif_header.tiff_diroff;
	off = sizeof (uint16) + sizeof (uint16);
	for (n = dirn-1; n > 0; n--) {
		if (nextdir == 0) {
			TIFFError(module, "Directory %d does not exist", dirn);
			return (0);
		}
		if (!TIFFAdvanceDirectory(tif, &nextdir, &off))
			return (0);
	}
	/*
	 * Advance to the directory to be unlinked and fetch
	 * the offset of the directory that follows.
	 */
	if (!TIFFAdvanceDirectory(tif, &nextdir, NULL))
		return (0);
	/*
	 * Go back and patch the link field of the preceding
	 * directory to point to the offset of the directory
	 * that follows.
	 */
	(void) TIFFSeekFile(tif, off, SEEK_SET);
	if (tif->tif_flags & TIFF_SWAB)
		TIFFSwabLong(&nextdir);
	if (!WriteOK(tif, &nextdir, sizeof (uint32))) {
		TIFFError(module, "Error writing directory link");
		return (0);
	}
	/*
	 * Leave directory state setup safely.  We don't have
	 * facilities for doing inserting and removing directories,
	 * so it's safest to just invalidate everything.  This
	 * means that the caller can only append to the directory
	 * chain.
	 */
	(*tif->tif_cleanup)(tif);
	if ((tif->tif_flags & TIFF_MYBUFFER) && tif->tif_rawdata) {
		_TIFFfree(tif->tif_rawdata);
		tif->tif_rawdata = NULL;
		tif->tif_rawcc = 0;
	}
	tif->tif_flags &= ~(TIFF_BEENWRITING|TIFF_BUFFERSETUP|TIFF_POSTENCODE);
	TIFFFreeDirectory(tif);
	TIFFDefaultDirectory(tif);
	tif->tif_diroff = 0;			/* force link on next write */
	tif->tif_nextdiroff = 0;		/* next write must be at end */
	tif->tif_curoff = 0;
	tif->tif_row = (uint32) -1;
	tif->tif_curstrip = (tstrip_t) -1;
	return (1);
}

/*			[BFC]
 *
 * Author: Bruce Cameron <cameron@petris.com>
 *
 * Set a table of tags that are to be replaced during directory process by the
 * 'IGNORE' state - or return TRUE/FALSE for the requested tag such that
 * 'ReadDirectory' can use the stored information.
 */
int
TIFFReassignTagToIgnore (enum TIFFIgnoreSense task, int TIFFtagID)
{
    static int TIFFignoretags [FIELD_LAST];
    static int tagcount = 0 ;
    int		i;					/* Loop index */
    int		j;					/* Loop index */

    switch (task)
    {
      case TIS_STORE:
        if ( tagcount < (FIELD_LAST - 1) )
        {
            for ( j = 0 ; j < tagcount ; ++j )
            {					/* Do not add duplicate tag */
                if ( TIFFignoretags [j] == TIFFtagID )
                    return (TRUE) ;
            }
            TIFFignoretags [tagcount++] = TIFFtagID ;
            return (TRUE) ;
        }
        break ;
        
      case TIS_EXTRACT:
        for ( i = 0 ; i < tagcount ; ++i )
        {
            if ( TIFFignoretags [i] == TIFFtagID )
                return (TRUE) ;
        }
        break;
        
      case TIS_EMPTY:
        tagcount = 0 ;			/* Clear the list */
        return (TRUE) ;
        
      default:
        break;
    }
    
    return (FALSE);
}