forked from Matthias-Wandel/imgcomp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathexif.c
executable file
·1149 lines (1014 loc) · 44.5 KB
/
exif.c
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
//--------------------------------------------------------------------------
// Copied from jhead project to parse exif file header.
// Matthias Wandel
//
// Imgcomp is licensed under GPL v2 (see README.txt)
//--------------------------------------------------------------------------
#include "jhead.h"
#include <math.h>
static unsigned char * DirWithThumbnailPtrs;
static double FocalplaneXRes;
static double FocalplaneUnits;
static int ExifImageWidth;
int MotorolaOrder = 0;
typedef struct {
unsigned short Tag;
char * Desc;
}TagTable_t;
//--------------------------------------------------------------------------
// Table of Jpeg encoding process names
/*
static const TagTable_t ProcessTable[] = {
{ M_SOF0, "Baseline"},
{ M_SOF1, "Extended sequential"},
{ M_SOF2, "Progressive"},
{ M_SOF3, "Lossless"},
{ M_SOF5, "Differential sequential"},
{ M_SOF6, "Differential progressive"},
{ M_SOF7, "Differential lossless"},
{ M_SOF9, "Extended sequential, arithmetic coding"},
{ M_SOF10, "Progressive, arithmetic coding"},
{ M_SOF11, "Lossless, arithmetic coding"},
{ M_SOF13, "Differential sequential, arithmetic coding"},
{ M_SOF14, "Differential progressive, arithmetic coding"},
{ M_SOF15, "Differential lossless, arithmetic coding"},
};
*/
#define PROCESS_TABLE_SIZE (sizeof(ProcessTable) / sizeof(TagTable_t))
// 1 - "The 0th row is at the visual top of the image, and the 0th column is the visual left-hand side."
// 2 - "The 0th row is at the visual top of the image, and the 0th column is the visual right-hand side."
// 3 - "The 0th row is at the visual bottom of the image, and the 0th column is the visual right-hand side."
// 4 - "The 0th row is at the visual bottom of the image, and the 0th column is the visual left-hand side."
// 5 - "The 0th row is the visual left-hand side of of the image, and the 0th column is the visual top."
// 6 - "The 0th row is the visual right-hand side of of the image, and the 0th column is the visual top."
// 7 - "The 0th row is the visual right-hand side of of the image, and the 0th column is the visual bottom."
// 8 - "The 0th row is the visual left-hand side of of the image, and the 0th column is the visual bottom."
// Note: The descriptions here are the same as the name of the command line
// option to pass to jpegtran to right the image
static const char * OrientTab[9] = {
"Undefined",
"Normal", // 1
"flip horizontal", // left right reversed mirror
"rotate 180", // 3
"flip vertical", // upside down mirror
"transpose", // Flipped about top-left <--> bottom-right axis.
"rotate 90", // rotate 90 cw to right it.
"transverse", // flipped about top-right <--> bottom-left axis
"rotate 270", // rotate 270 to right it.
};
const int BytesPerFormat[] = {0,1,1,2,4,8,1,1,2,4,8,4,8};
//--------------------------------------------------------------------------
// Describes tag values
#define TAG_INTEROP_INDEX 0x0001
#define TAG_INTEROP_VERSION 0x0002
#define TAG_IMAGE_WIDTH 0x0100
#define TAG_IMAGE_LENGTH 0x0101
#define TAG_BITS_PER_SAMPLE 0x0102
#define TAG_COMPRESSION 0x0103
#define TAG_PHOTOMETRIC_INTERP 0x0106
#define TAG_FILL_ORDER 0x010A
#define TAG_DOCUMENT_NAME 0x010D
#define TAG_IMAGE_DESCRIPTION 0x010E
#define TAG_MAKE 0x010F
#define TAG_MODEL 0x0110
#define TAG_SRIP_OFFSET 0x0111
#define TAG_ORIENTATION 0x0112
#define TAG_SAMPLES_PER_PIXEL 0x0115
#define TAG_ROWS_PER_STRIP 0x0116
#define TAG_STRIP_BYTE_COUNTS 0x0117
#define TAG_X_RESOLUTION 0x011A
#define TAG_Y_RESOLUTION 0x011B
#define TAG_PLANAR_CONFIGURATION 0x011C
#define TAG_RESOLUTION_UNIT 0x0128
#define TAG_TRANSFER_FUNCTION 0x012D
#define TAG_SOFTWARE 0x0131
#define TAG_DATETIME 0x0132
#define TAG_ARTIST 0x013B
#define TAG_WHITE_POINT 0x013E
#define TAG_PRIMARY_CHROMATICITIES 0x013F
#define TAG_TRANSFER_RANGE 0x0156
#define TAG_JPEG_PROC 0x0200
#define TAG_THUMBNAIL_OFFSET 0x0201
#define TAG_THUMBNAIL_LENGTH 0x0202
#define TAG_Y_CB_CR_COEFFICIENTS 0x0211
#define TAG_Y_CB_CR_SUB_SAMPLING 0x0212
#define TAG_Y_CB_CR_POSITIONING 0x0213
#define TAG_REFERENCE_BLACK_WHITE 0x0214
#define TAG_RELATED_IMAGE_WIDTH 0x1001
#define TAG_RELATED_IMAGE_LENGTH 0x1002
#define TAG_CFA_REPEAT_PATTERN_DIM 0x828D
#define TAG_CFA_PATTERN1 0x828E
#define TAG_BATTERY_LEVEL 0x828F
#define TAG_COPYRIGHT 0x8298
#define TAG_EXPOSURETIME 0x829A
#define TAG_FNUMBER 0x829D
#define TAG_IPTC_NAA 0x83BB
#define TAG_EXIF_OFFSET 0x8769
#define TAG_INTER_COLOR_PROFILE 0x8773
#define TAG_EXPOSURE_PROGRAM 0x8822
#define TAG_SPECTRAL_SENSITIVITY 0x8824
#define TAG_GPSINFO 0x8825
#define TAG_ISO_EQUIVALENT 0x8827
#define TAG_OECF 0x8828
#define TAG_EXIF_VERSION 0x9000
#define TAG_DATETIME_ORIGINAL 0x9003
#define TAG_DATETIME_DIGITIZED 0x9004
#define TAG_COMPONENTS_CONFIG 0x9101
#define TAG_CPRS_BITS_PER_PIXEL 0x9102
#define TAG_SHUTTERSPEED 0x9201
#define TAG_APERTURE 0x9202
#define TAG_BRIGHTNESS_VALUE 0x9203
#define TAG_EXPOSURE_BIAS 0x9204
#define TAG_MAXAPERTURE 0x9205
#define TAG_SUBJECT_DISTANCE 0x9206
#define TAG_METERING_MODE 0x9207
#define TAG_LIGHT_SOURCE 0x9208
#define TAG_FLASH 0x9209
#define TAG_FOCALLENGTH 0x920A
#define TAG_SUBJECTAREA 0x9214
#define TAG_MAKER_NOTE 0x927C
#define TAG_USERCOMMENT 0x9286
#define TAG_SUBSEC_TIME 0x9290
#define TAG_SUBSEC_TIME_ORIG 0x9291
#define TAG_SUBSEC_TIME_DIG 0x9292
#define TAG_WINXP_TITLE 0x9c9b // Windows XP - not part of exif standard.
#define TAG_WINXP_COMMENT 0x9c9c // Windows XP - not part of exif standard.
#define TAG_WINXP_AUTHOR 0x9c9d // Windows XP - not part of exif standard.
#define TAG_WINXP_KEYWORDS 0x9c9e // Windows XP - not part of exif standard.
#define TAG_WINXP_SUBJECT 0x9c9f // Windows XP - not part of exif standard.
#define TAG_FLASH_PIX_VERSION 0xA000
#define TAG_COLOR_SPACE 0xA001
#define TAG_PIXEL_X_DIMENSION 0xA002
#define TAG_PIXEL_Y_DIMENSION 0xA003
#define TAG_RELATED_AUDIO_FILE 0xA004
#define TAG_INTEROP_OFFSET 0xA005
#define TAG_FLASH_ENERGY 0xA20B
#define TAG_SPATIAL_FREQ_RESP 0xA20C
#define TAG_FOCAL_PLANE_XRES 0xA20E
#define TAG_FOCAL_PLANE_YRES 0xA20F
#define TAG_FOCAL_PLANE_UNITS 0xA210
#define TAG_SUBJECT_LOCATION 0xA214
#define TAG_EXPOSURE_INDEX 0xA215
#define TAG_SENSING_METHOD 0xA217
#define TAG_FILE_SOURCE 0xA300
#define TAG_SCENE_TYPE 0xA301
#define TAG_CFA_PATTERN 0xA302
#define TAG_CUSTOM_RENDERED 0xA401
#define TAG_EXPOSURE_MODE 0xA402
#define TAG_WHITEBALANCE 0xA403
#define TAG_DIGITALZOOMRATIO 0xA404
#define TAG_FOCALLENGTH_35MM 0xA405
#define TAG_SCENE_CAPTURE_TYPE 0xA406
#define TAG_GAIN_CONTROL 0xA407
#define TAG_CONTRAST 0xA408
#define TAG_SATURATION 0xA409
#define TAG_SHARPNESS 0xA40A
#define TAG_DISTANCE_RANGE 0xA40C
#define TAG_IMAGE_UNIQUE_ID 0xA420
static const TagTable_t TagTable[] = {
{ TAG_INTEROP_INDEX, "InteropIndex"},
{ TAG_INTEROP_VERSION, "InteropVersion"},
{ TAG_IMAGE_WIDTH, "ImageWidth"},
{ TAG_IMAGE_LENGTH, "ImageLength"},
{ TAG_BITS_PER_SAMPLE, "BitsPerSample"},
{ TAG_COMPRESSION, "Compression"},
{ TAG_PHOTOMETRIC_INTERP, "PhotometricInterpretation"},
{ TAG_FILL_ORDER, "FillOrder"},
{ TAG_DOCUMENT_NAME, "DocumentName"},
{ TAG_IMAGE_DESCRIPTION, "ImageDescription"},
{ TAG_MAKE, "Make"},
{ TAG_MODEL, "Model"},
{ TAG_SRIP_OFFSET, "StripOffsets"},
{ TAG_ORIENTATION, "Orientation"},
{ TAG_SAMPLES_PER_PIXEL, "SamplesPerPixel"},
{ TAG_ROWS_PER_STRIP, "RowsPerStrip"},
{ TAG_STRIP_BYTE_COUNTS, "StripByteCounts"},
{ TAG_X_RESOLUTION, "XResolution"},
{ TAG_Y_RESOLUTION, "YResolution"},
{ TAG_PLANAR_CONFIGURATION, "PlanarConfiguration"},
{ TAG_RESOLUTION_UNIT, "ResolutionUnit"},
{ TAG_TRANSFER_FUNCTION, "TransferFunction"},
{ TAG_SOFTWARE, "Software"},
{ TAG_DATETIME, "DateTime"},
{ TAG_ARTIST, "Artist"},
{ TAG_WHITE_POINT, "WhitePoint"},
{ TAG_PRIMARY_CHROMATICITIES, "PrimaryChromaticities"},
{ TAG_TRANSFER_RANGE, "TransferRange"},
{ TAG_JPEG_PROC, "JPEGProc"},
{ TAG_THUMBNAIL_OFFSET, "ThumbnailOffset"},
{ TAG_THUMBNAIL_LENGTH, "ThumbnailLength"},
{ TAG_Y_CB_CR_COEFFICIENTS, "YCbCrCoefficients"},
{ TAG_Y_CB_CR_SUB_SAMPLING, "YCbCrSubSampling"},
{ TAG_Y_CB_CR_POSITIONING, "YCbCrPositioning"},
{ TAG_REFERENCE_BLACK_WHITE, "ReferenceBlackWhite"},
{ TAG_RELATED_IMAGE_WIDTH, "RelatedImageWidth"},
{ TAG_RELATED_IMAGE_LENGTH, "RelatedImageLength"},
{ TAG_CFA_REPEAT_PATTERN_DIM, "CFARepeatPatternDim"},
{ TAG_CFA_PATTERN1, "CFAPattern"},
{ TAG_BATTERY_LEVEL, "BatteryLevel"},
{ TAG_COPYRIGHT, "Copyright"},
{ TAG_EXPOSURETIME, "ExposureTime"},
{ TAG_FNUMBER, "FNumber"},
{ TAG_IPTC_NAA, "IPTC/NAA"},
{ TAG_EXIF_OFFSET, "ExifOffset"},
{ TAG_INTER_COLOR_PROFILE, "InterColorProfile"},
{ TAG_EXPOSURE_PROGRAM, "ExposureProgram"},
{ TAG_SPECTRAL_SENSITIVITY, "SpectralSensitivity"},
{ TAG_GPSINFO, "GPS Dir offset"},
{ TAG_ISO_EQUIVALENT, "ISOSpeedRatings"},
{ TAG_OECF, "OECF"},
{ TAG_EXIF_VERSION, "ExifVersion"},
{ TAG_DATETIME_ORIGINAL, "DateTimeOriginal"},
{ TAG_DATETIME_DIGITIZED, "DateTimeDigitized"},
{ TAG_COMPONENTS_CONFIG, "ComponentsConfiguration"},
{ TAG_CPRS_BITS_PER_PIXEL, "CompressedBitsPerPixel"},
{ TAG_SHUTTERSPEED, "ShutterSpeedValue"},
{ TAG_APERTURE, "ApertureValue"},
{ TAG_BRIGHTNESS_VALUE, "BrightnessValue"},
{ TAG_EXPOSURE_BIAS, "ExposureBiasValue"},
{ TAG_MAXAPERTURE, "MaxApertureValue"},
{ TAG_SUBJECT_DISTANCE, "SubjectDistance"},
{ TAG_METERING_MODE, "MeteringMode"},
{ TAG_LIGHT_SOURCE, "LightSource"},
{ TAG_FLASH, "Flash"},
{ TAG_FOCALLENGTH, "FocalLength"},
{ TAG_MAKER_NOTE, "MakerNote"},
{ TAG_USERCOMMENT, "UserComment"},
{ TAG_SUBSEC_TIME, "SubSecTime"},
{ TAG_SUBSEC_TIME_ORIG, "SubSecTimeOriginal"},
{ TAG_SUBSEC_TIME_DIG, "SubSecTimeDigitized"},
{ TAG_WINXP_TITLE, "Windows-XP Title"},
{ TAG_WINXP_COMMENT, "Windows-XP comment"},
{ TAG_WINXP_AUTHOR, "Windows-XP author"},
{ TAG_WINXP_KEYWORDS, "Windows-XP keywords"},
{ TAG_WINXP_SUBJECT, "Windows-XP subject"},
{ TAG_FLASH_PIX_VERSION, "FlashPixVersion"},
{ TAG_COLOR_SPACE, "ColorSpace"},
{ TAG_PIXEL_X_DIMENSION, "ExifImageWidth"},
{ TAG_PIXEL_Y_DIMENSION, "ExifImageLength"},
{ TAG_RELATED_AUDIO_FILE, "RelatedAudioFile"},
{ TAG_INTEROP_OFFSET, "InteroperabilityOffset"},
{ TAG_FLASH_ENERGY, "FlashEnergy"},
{ TAG_SPATIAL_FREQ_RESP, "SpatialFrequencyResponse"},
{ TAG_FOCAL_PLANE_XRES, "FocalPlaneXResolution"},
{ TAG_FOCAL_PLANE_YRES, "FocalPlaneYResolution"},
{ TAG_FOCAL_PLANE_UNITS, "FocalPlaneResolutionUnit"},
{ TAG_SUBJECT_LOCATION, "SubjectLocation"},
{ TAG_EXPOSURE_INDEX, "ExposureIndex"},
{ TAG_SENSING_METHOD, "SensingMethod"},
{ TAG_FILE_SOURCE, "FileSource"},
{ TAG_SCENE_TYPE, "SceneType"},
{ TAG_CFA_PATTERN, "CFA Pattern"},
{ TAG_CUSTOM_RENDERED, "CustomRendered"},
{ TAG_EXPOSURE_MODE, "ExposureMode"},
{ TAG_WHITEBALANCE, "WhiteBalance"},
{ TAG_DIGITALZOOMRATIO, "DigitalZoomRatio"},
{ TAG_FOCALLENGTH_35MM, "FocalLengthIn35mmFilm"},
{ TAG_SUBJECTAREA, "SubjectArea"},
{ TAG_SCENE_CAPTURE_TYPE, "SceneCaptureType"},
{ TAG_GAIN_CONTROL, "GainControl"},
{ TAG_CONTRAST, "Contrast"},
{ TAG_SATURATION, "Saturation"},
{ TAG_SHARPNESS, "Sharpness"},
{ TAG_DISTANCE_RANGE, "SubjectDistanceRange"},
{ TAG_IMAGE_UNIQUE_ID, "ImageUniqueId"},
} ;
#define TAG_TABLE_SIZE (sizeof(TagTable) / sizeof(TagTable_t))
//--------------------------------------------------------------------------
// Convert a 16 bit unsigned value from file's native byte order
//--------------------------------------------------------------------------
int Get16u(void * Short)
{
if (MotorolaOrder){
return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
}else{
return (((uchar *)Short)[1] << 8) | ((uchar *)Short)[0];
}
}
//--------------------------------------------------------------------------
// Convert a 32 bit signed value from file's native byte order
//--------------------------------------------------------------------------
int Get32s(void * Long)
{
if (MotorolaOrder){
return ((( char *)Long)[0] << 24) | (((uchar *)Long)[1] << 16)
| (((uchar *)Long)[2] << 8 ) | (((uchar *)Long)[3] << 0 );
}else{
return ((( char *)Long)[3] << 24) | (((uchar *)Long)[2] << 16)
| (((uchar *)Long)[1] << 8 ) | (((uchar *)Long)[0] << 0 );
}
}
//--------------------------------------------------------------------------
// Convert a 32 bit unsigned value to file's native byte order
//--------------------------------------------------------------------------
void Put32u(void * Value, unsigned PutValue)
{
if (MotorolaOrder){
((uchar *)Value)[0] = (uchar)(PutValue>>24);
((uchar *)Value)[1] = (uchar)(PutValue>>16);
((uchar *)Value)[2] = (uchar)(PutValue>>8);
((uchar *)Value)[3] = (uchar)PutValue;
}else{
((uchar *)Value)[0] = (uchar)PutValue;
((uchar *)Value)[1] = (uchar)(PutValue>>8);
((uchar *)Value)[2] = (uchar)(PutValue>>16);
((uchar *)Value)[3] = (uchar)(PutValue>>24);
}
}
//--------------------------------------------------------------------------
// Convert a 32 bit unsigned value from file's native byte order
//--------------------------------------------------------------------------
unsigned Get32u(void * Long)
{
return (unsigned)Get32s(Long) & 0xffffffff;
}
//--------------------------------------------------------------------------
// Display a number as one of its many formats
//--------------------------------------------------------------------------
void PrintFormatNumber(void * ValuePtr, int Format, int ByteCount)
{
int s,n;
for(n=0;n<16;n++){
switch(Format){
case FMT_SBYTE:
case FMT_BYTE: printf("%02x",*(uchar *)ValuePtr); s=1; break;
case FMT_USHORT: printf("%d",Get16u(ValuePtr)); s=2; break;
case FMT_ULONG:
case FMT_SLONG: printf("%d",Get32s(ValuePtr)); s=4; break;
case FMT_SSHORT: printf("%hd",(signed short)Get16u(ValuePtr)); s=2; break;
case FMT_URATIONAL:
printf("%u/%u",Get32s(ValuePtr), Get32s(4+(char *)ValuePtr));
s = 8;
break;
case FMT_SRATIONAL:
printf("%d/%d",Get32s(ValuePtr), Get32s(4+(char *)ValuePtr));
s = 8;
break;
case FMT_SINGLE: printf("%f",(double)*(float *)ValuePtr); s=8; break;
case FMT_DOUBLE: printf("%f",*(double *)ValuePtr); s=8; break;
default:
printf("Unknown format %d:", Format);
return;
}
ByteCount -= s;
if (ByteCount <= 0) break;
printf(", ");
ValuePtr = (void *)((char *)ValuePtr + s);
}
if (n >= 16) printf("...");
}
//--------------------------------------------------------------------------
// Evaluate number, be it int, rational, or float from directory.
//--------------------------------------------------------------------------
double ConvertAnyFormat(void * ValuePtr, int Format)
{
double Value;
Value = 0;
switch(Format){
case FMT_SBYTE: Value = *(signed char *)ValuePtr; break;
case FMT_BYTE: Value = *(uchar *)ValuePtr; break;
case FMT_USHORT: Value = Get16u(ValuePtr); break;
case FMT_ULONG: Value = Get32u(ValuePtr); break;
case FMT_URATIONAL:
case FMT_SRATIONAL:
{
int Num,Den;
Num = Get32s(ValuePtr);
Den = Get32s(4+(char *)ValuePtr);
if (Den == 0){
Value = 0;
}else{
if (Format == FMT_SRATIONAL){
Value = (double)Num/Den;
}else{
Value = (double)(unsigned)Num/(double)(unsigned)Den;
}
}
break;
}
case FMT_SSHORT: Value = (signed short)Get16u(ValuePtr); break;
case FMT_SLONG: Value = Get32s(ValuePtr); break;
// Not sure if this is correct (never seen float used in Exif format)
case FMT_SINGLE: Value = (double)*(float *)ValuePtr; break;
case FMT_DOUBLE: Value = *(double *)ValuePtr; break;
default:
ErrNonfatal("Illegal format code %d in Exif header",Format,0);
}
return Value;
}
//--------------------------------------------------------------------------
// Process one of the nested EXIF directories.
//--------------------------------------------------------------------------
static void ProcessExifDir(unsigned char * DirStart, unsigned char * OffsetBase,
unsigned ExifLength, int NestingLevel)
{
int de;
int a;
int NumDirEntries;
char IndentString[25];
if (NestingLevel > 4){
ErrNonfatal("Maximum Exif directory nesting exceeded (corrupt Exif header)", 0,0);
return;
}
memset(IndentString, ' ', 25);
IndentString[NestingLevel * 4] = '\0';
NumDirEntries = Get16u(DirStart);
#define DIR_ENTRY_ADDR(Start, Entry) (Start+2+12*(Entry))
{
unsigned char * DirEnd;
DirEnd = DIR_ENTRY_ADDR(DirStart, NumDirEntries);
if (DirEnd+4 > (OffsetBase+ExifLength)){
if (DirEnd+2 == OffsetBase+ExifLength || DirEnd == OffsetBase+ExifLength){
// Version 1.3 of jhead would truncate a bit too much.
// This also caught later on as well.
}else{
ErrNonfatal("Illegally sized Exif subdirectory (%d entries)",NumDirEntries,0);
return;
}
}
}
if (ShowTags){
printf("(dir has %d entries)\n",NumDirEntries);
}
for (de=0;de<NumDirEntries;de++){
int Tag, Format, Components;
unsigned char * ValuePtr;
int ByteCount;
unsigned char * DirEntry;
DirEntry = DIR_ENTRY_ADDR(DirStart, de);
Tag = Get16u(DirEntry);
Format = Get16u(DirEntry+2);
Components = Get32u(DirEntry+4);
if ((Format-1) >= NUM_FORMATS) {
// (-1) catches illegal zero case as unsigned underflows to positive large.
ErrNonfatal("Illegal number format %d for tag %04x in Exif", Format, Tag);
continue;
}
if ((unsigned)Components > 0x10000){
ErrNonfatal("Too many components %d for tag %04x in Exif", Components, Tag);
continue;
}
ByteCount = Components * BytesPerFormat[Format];
if (ByteCount > 4){
unsigned OffsetVal;
OffsetVal = Get32u(DirEntry+8);
// If its bigger than 4 bytes, the dir entry contains an offset.
if (OffsetVal+ByteCount > ExifLength){
// Bogus pointer offset and / or bytecount value
ErrNonfatal("Illegal value pointer for tag %04x in Exif", Tag,0);
continue;
}
ValuePtr = OffsetBase+OffsetVal;
}else{
// 4 bytes or less and value is in the dir entry itself
ValuePtr = DirEntry+8;
}
if (ShowTags){
// Show tag name
for (a=0;;a++){
if (a >= TAG_TABLE_SIZE){
printf("%s Unknown Tag %04x Value = ", IndentString, Tag);
break;
}
if (TagTable[a].Tag == Tag){
printf("%s %s = ",IndentString, TagTable[a].Desc);
break;
}
}
// Show tag value.
switch(Format){
case FMT_BYTE:
if(ByteCount>1){
printf("%.*ls\n", ByteCount/2, (wchar_t *)ValuePtr);
}else{
PrintFormatNumber(ValuePtr, Format, ByteCount);
printf("\n");
}
break;
case FMT_UNDEFINED:
// Undefined is typically an ascii string.
case FMT_STRING:
// String arrays printed without function call (different from int arrays)
{
int NoPrint = 0;
printf("\"");
for (a=0;a<ByteCount;a++){
if (ValuePtr[a] >= 32){
putchar(ValuePtr[a]);
NoPrint = 0;
}else{
// Avoiding indicating too many unprintable characters of proprietary
// bits of binary information this program may not know how to parse.
if (!NoPrint && a != ByteCount-1){
putchar('?');
NoPrint = 1;
}
}
}
printf("\"\n");
}
break;
default:
// Handle arrays of numbers later (will there ever be?)
PrintFormatNumber(ValuePtr, Format, ByteCount);
printf("\n");
}
}
// Extract useful components of tag
switch(Tag){
case TAG_MAKE:
strncpy(ImageInfo.CameraMake, (char *)ValuePtr, ByteCount < 31 ? ByteCount : 31);
break;
case TAG_MODEL:
strncpy(ImageInfo.CameraModel, (char *)ValuePtr, ByteCount < 39 ? ByteCount : 39);
break;
case TAG_DATETIME_ORIGINAL:
// If we get a DATETIME_ORIGINAL, we use that one.
strncpy(ImageInfo.DateTime, (char *)ValuePtr, 19);
// Fallthru...
case TAG_DATETIME_DIGITIZED:
case TAG_DATETIME:
if (!isdigit(ImageInfo.DateTime[0])){
// If we don't already have a DATETIME_ORIGINAL, use whatever
// time fields we may have.
strncpy(ImageInfo.DateTime, (char *)ValuePtr, 19);
}
break;
case TAG_FNUMBER:
// Simplest way of expressing aperture, so I trust it the most.
// (overwrite previously computd value if there is one)
ImageInfo.ApertureFNumber = (float)ConvertAnyFormat(ValuePtr, Format);
break;
#if 0 // don't pull in extra math stuff.
case TAG_APERTURE:
case TAG_MAXAPERTURE:
// More relevant info always comes earlier, so only use this field if we don't
// have appropriate aperture information yet.
if (ImageInfo.ApertureFNumber == 0){
ImageInfo.ApertureFNumber
= (float)exp(ConvertAnyFormat(ValuePtr, Format)*log(2)*0.5);
}
break;
case TAG_SHUTTERSPEED:
// More complicated way of expressing exposure time, so only use
// this value if we don't already have it from somewhere else.
if (ImageInfo.ExposureTime == 0){
ImageInfo.ExposureTime
= (float)(1/exp(ConvertAnyFormat(ValuePtr, Format)*log(2)));
}
break;
#endif
case TAG_FOCALLENGTH:
// Nice digital cameras actually save the focal length as a function
// of how farthey are zoomed in.
ImageInfo.FocalLength = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_SUBJECT_DISTANCE:
// Inidcates the distacne the autofocus camera is focused to.
// Tends to be less accurate as distance increases.
ImageInfo.Distance = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_EXPOSURETIME:
// Simplest way of expressing exposure time, so I trust it most.
// (overwrite previously computd value if there is one)
ImageInfo.ExposureTime = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_FLASH:
ImageInfo.FlashUsed=(int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_ORIENTATION:
ImageInfo.Orientation = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_PIXEL_Y_DIMENSION:
case TAG_PIXEL_X_DIMENSION:
// Use largest of height and width to deal with images that have been
// rotated to portrait format.
a = (int)ConvertAnyFormat(ValuePtr, Format);
if (ExifImageWidth < a) ExifImageWidth = a;
break;
case TAG_FOCAL_PLANE_XRES:
FocalplaneXRes = ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_FOCAL_PLANE_UNITS:
switch((int)ConvertAnyFormat(ValuePtr, Format)){
case 1: FocalplaneUnits = 25.4; break; // inch
case 2:
// According to the information I was using, 2 means meters.
// But looking at the Cannon powershot's files, inches is the only
// sensible value.
FocalplaneUnits = 25.4;
break;
case 3: FocalplaneUnits = 10; break; // centimeter
case 4: FocalplaneUnits = 1; break; // millimeter
case 5: FocalplaneUnits = .001; break; // micrometer
}
break;
case TAG_EXPOSURE_BIAS:
ImageInfo.ExposureBias = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_WHITEBALANCE:
ImageInfo.Whitebalance = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_LIGHT_SOURCE:
ImageInfo.LightSource = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_METERING_MODE:
ImageInfo.MeteringMode = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_EXPOSURE_PROGRAM:
ImageInfo.ExposureProgram = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_EXPOSURE_INDEX:
if (ImageInfo.ISOequivalent == 0){
// Exposure index and ISO equivalent are often used interchangeably,
// so we will do the same in jhead.
// http://photography.about.com/library/glossary/bldef_ei.htm
ImageInfo.ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
}
break;
case TAG_EXPOSURE_MODE:
ImageInfo.ExposureMode = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_ISO_EQUIVALENT:
ImageInfo.ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_DIGITALZOOMRATIO:
ImageInfo.DigitalZoomRatio = (float)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_EXIF_OFFSET:
if (ShowTags) printf("%s Exif Dir:",IndentString);
case TAG_INTEROP_OFFSET:
if (Tag == TAG_INTEROP_OFFSET && ShowTags) printf("%s Interop Dir:",IndentString);
{
unsigned char * SubdirStart;
SubdirStart = OffsetBase + Get32u(ValuePtr);
if (SubdirStart < OffsetBase || SubdirStart > OffsetBase+ExifLength){
ErrNonfatal("Illegal Exif or interop ofset directory link",0,0);
}else{
ProcessExifDir(SubdirStart, OffsetBase, ExifLength, NestingLevel+1);
}
continue;
}
break;
case TAG_FOCALLENGTH_35MM:
// The focal length equivalent 35 mm is a 2.2 tag (defined as of April 2002)
// if its present, use it to compute equivalent focal length instead of
// computing it from sensor geometry and actual focal length.
ImageInfo.FocalLength35mmEquiv = (unsigned)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_DISTANCE_RANGE:
// Three possible standard values:
// 1 = macro, 2 = close, 3 = distant
ImageInfo.DistanceRange = (int)ConvertAnyFormat(ValuePtr, Format);
break;
case TAG_X_RESOLUTION:
if (NestingLevel==0) {// Only use the values from the top level directory
ImageInfo.xResolution = (float)ConvertAnyFormat(ValuePtr,Format);
// if yResolution has not been set, use the value of xResolution
if (ImageInfo.yResolution == 0.0) ImageInfo.yResolution = ImageInfo.xResolution;
}
break;
case TAG_Y_RESOLUTION:
if (NestingLevel==0) {// Only use the values from the top level directory
ImageInfo.yResolution = (float)ConvertAnyFormat(ValuePtr,Format);
// if xResolution has not been set, use the value of yResolution
if (ImageInfo.xResolution == 0.0) ImageInfo.xResolution = ImageInfo.yResolution;
}
break;
case TAG_RESOLUTION_UNIT:
if (NestingLevel==0) {// Only use the values from the top level directory
ImageInfo.ResolutionUnit = (int) ConvertAnyFormat(ValuePtr,Format);
}
break;
}
}
{
// In addition to linking to subdirectories via exif tags,
// there's also a potential link to another directory at the end of each
// directory. this has got to be the result of a committee!
unsigned char * SubdirStart;
unsigned Offset;
if (DIR_ENTRY_ADDR(DirStart, NumDirEntries) + 4 <= OffsetBase+ExifLength){
Offset = Get32u(DirStart+2+12*NumDirEntries);
if (Offset){
SubdirStart = OffsetBase + Offset;
if (SubdirStart > OffsetBase+ExifLength || SubdirStart < OffsetBase){
if (SubdirStart > OffsetBase && SubdirStart < OffsetBase+ExifLength+20){
// Jhead 1.3 or earlier would crop the whole directory!
// As Jhead produces this form of format incorrectness,
// I'll just let it pass silently
if (ShowTags) printf("Thumbnail removed with Jhead 1.3 or earlier\n");
}else{
ErrNonfatal("Illegal subdirectory link in Exif header",0,0);
}
}else{
if (SubdirStart <= OffsetBase+ExifLength){
if (ShowTags) printf("%s Continued directory ",IndentString);
ProcessExifDir(SubdirStart, OffsetBase, ExifLength, NestingLevel+1);
}
}
}
}else{
// The exif header ends before the last next directory pointer.
}
}
}
//--------------------------------------------------------------------------
// Process a EXIF marker
// Describes all the drivel that most digital cameras include...
//--------------------------------------------------------------------------
void process_EXIF (unsigned char * ExifSection, unsigned int length)
{
unsigned int FirstOffset;
FocalplaneXRes = 0;
FocalplaneUnits = 0;
ExifImageWidth = 0;
if (ShowTags){
printf("Exif header %u bytes long\n",length);
}
{ // Check the EXIF header component
static uchar ExifHeader[] = "Exif\0\0";
if (memcmp(ExifSection+2, ExifHeader,6)){
ErrNonfatal("Incorrect Exif header",0,0);
return;
}
}
if (memcmp(ExifSection+8,"II",2) == 0){
if (ShowTags) printf("Exif section in Intel order\n");
MotorolaOrder = 0;
}else{
if (memcmp(ExifSection+8,"MM",2) == 0){
if (ShowTags) printf("Exif section in Motorola order\n");
MotorolaOrder = 1;
}else{
ErrNonfatal("Invalid Exif alignment marker.",0,0);
return;
}
}
// Check the next value for correctness.
if (Get16u(ExifSection+10) != 0x2a){
ErrNonfatal("Invalid Exif start (1)",0,0);
return;
}
FirstOffset = Get32u(ExifSection+12);
if (FirstOffset < 8 || FirstOffset > 16){
if (FirstOffset < 16 || FirstOffset > length-16){
ErrNonfatal("invalid offset for first Exif IFD value",0,0);
return;
}
// Usually set to 8, but other values valid too.
ErrNonfatal("Suspicious offset of first Exif IFD value",0,0);
}
DirWithThumbnailPtrs = NULL;
// First directory starts 16 bytes in. All offset are relative to 8 bytes in.
ProcessExifDir(ExifSection+8+FirstOffset, ExifSection+8, length-8, 0);
}
//--------------------------------------------------------------------------
// Convert exif time to Unix time structure
//--------------------------------------------------------------------------
int Exif2tm(struct tm * timeptr, char * ExifTime)
{
int a;
timeptr->tm_wday = -1;
// Check for format: YYYY:MM:DD HH:MM:SS format.
// Date and time normally separated by a space, but also seen a ':' there, so
// skip the middle space with '%*c' so it can be any character.
timeptr->tm_sec = 0;
a = sscanf(ExifTime, "%d%*c%d%*c%d%*c%d:%d:%d",
&timeptr->tm_year, &timeptr->tm_mon, &timeptr->tm_mday,
&timeptr->tm_hour, &timeptr->tm_min, &timeptr->tm_sec);
if (a >= 5){
if (timeptr->tm_year <= 12 && timeptr->tm_mday > 2000 && ExifTime[2] == '.'){
// LG Electronics VX-9700 seems to encode the date as 'MM.DD.YYYY HH:MM'
// can't these people read the standard? At least they left enough room
// in the header to put an Exif format date in there.
int tmp;
tmp = timeptr->tm_year;
timeptr->tm_year = timeptr->tm_mday;
timeptr->tm_mday = timeptr->tm_mon;
timeptr->tm_mon = tmp;
}
// Accept five or six parameters. Some cameras do not store seconds.
timeptr->tm_isdst = -1;
timeptr->tm_mon -= 1; // Adjust for unix zero-based months
timeptr->tm_year -= 1900; // Adjust for year starting at 1900
return TRUE; // worked.
}
return FALSE; // Wasn't in Exif date format.
}
//--------------------------------------------------------------------------
// Show the collected image info, displaying camera F-stop and shutter speed
// in a consistent and legible fashion.
//--------------------------------------------------------------------------
void ShowImageInfo(int ShowFileInfo)
{
if (ShowFileInfo){
printf("File name : %s\n",ImageInfo.FileName);
printf("File size : %d bytes\n",ImageInfo.FileSize);
}
if (ImageInfo.CameraMake[0]){
printf("Camera make : %s\n",ImageInfo.CameraMake);
printf("Camera model : %s\n",ImageInfo.CameraModel);
}
if (ImageInfo.DateTime[0]){
printf("Date/Time : %s\n",ImageInfo.DateTime);
}
printf("Resolution : %d x %d\n",ImageInfo.Width, ImageInfo.Height);
if (ImageInfo.Orientation > 1 && ImageInfo.Orientation <=8){
// Only print orientation if one was supplied, and if its not 1 (normal orientation)
printf("Orientation : %s\n", OrientTab[ImageInfo.Orientation]);
}
if (ImageInfo.FlashUsed >= 0){
if (ImageInfo.FlashUsed & 1){
printf("Flash used : Yes");
switch (ImageInfo.FlashUsed){
case 0x5: printf(" (Strobe light not detected)"); break;
case 0x7: printf(" (Strobe light detected) "); break;
case 0x9: printf(" (manual)"); break;
case 0xd: printf(" (manual, return light not detected)"); break;
case 0xf: printf(" (manual, return light detected)"); break;
case 0x19:printf(" (auto)"); break;
case 0x1d:printf(" (auto, return light not detected)"); break;
case 0x1f:printf(" (auto, return light detected)"); break;
case 0x41:printf(" (red eye reduction mode)"); break;
case 0x45:printf(" (red eye reduction mode return light not detected)"); break;
case 0x47:printf(" (red eye reduction mode return light detected)"); break;
case 0x49:printf(" (manual, red eye reduction mode)"); break;
case 0x4d:printf(" (manual, red eye reduction mode, return light not detected)"); break;
case 0x4f:printf(" (red eye reduction mode, return light detected)"); break;
case 0x59:printf(" (auto, red eye reduction mode)"); break;
case 0x5d:printf(" (auto, red eye reduction mode, return light not detected)"); break;
case 0x5f:printf(" (auto, red eye reduction mode, return light detected)"); break;
}
}else{
printf("Flash used : No");
switch (ImageInfo.FlashUsed){
case 0x18:printf(" (auto)"); break;
}
}
printf("\n");
}
if (ImageInfo.FocalLength){
printf("Focal length : %4.1fmm",(double)ImageInfo.FocalLength);
if (ImageInfo.FocalLength35mmEquiv){
printf(" (35mm equivalent: %dmm)", ImageInfo.FocalLength35mmEquiv);
}
printf("\n");
}
if (ImageInfo.DigitalZoomRatio > 1){
// Digital zoom used. Shame on you!
printf("Digital Zoom : %1.3fx\n", (double)ImageInfo.DigitalZoomRatio);
}
if (ImageInfo.ExposureTime){
if (ImageInfo.ExposureTime < 0.010){
printf("Exposure time: %6.4f s ",(double)ImageInfo.ExposureTime);
}else{
printf("Exposure time: %5.3f s ",(double)ImageInfo.ExposureTime);
}
if (ImageInfo.ExposureTime <= 0.5){
printf(" (1/%d)",(int)(0.5 + 1/ImageInfo.ExposureTime));
}
printf("\n");
}
if (ImageInfo.ApertureFNumber){
printf("Aperture : f/%3.1f\n",(double)ImageInfo.ApertureFNumber);
}
if (ImageInfo.Distance){
if (ImageInfo.Distance < 0){
printf("Focus dist. : Infinite\n");
}else{
printf("Focus dist. : %4.2fm\n",(double)ImageInfo.Distance);