1 //--------------------------------------------------------------------------
2 // Program to pull the information out of various types of EXIF digital
3 // camera files and show it in a reasonably consistent way
4 //
5 // This module parses the very complicated exif structures.
6 //
7 // Matthias Wandel
8 //--------------------------------------------------------------------------
9 #include "jhead.h"
10
11 #include <math.h>
12 #include <ctype.h>
13 #include <utils/Log.h>
14
15 static unsigned char * DirWithThumbnailPtrs;
16 static double FocalplaneXRes;
17 static double FocalplaneUnits;
18 static int ExifImageWidth;
19 static int MotorolaOrder = 0;
20
21 // for fixing the rotation.
22 static void * OrientationPtr[2];
23 static int OrientationNumFormat[2];
24 int NumOrientations = 0;
25
26
27 // Define the line below to turn on poor man's debugging output
28 #undef SUPERDEBUG
29
30 #ifdef SUPERDEBUG
31 #define printf ALOGE
32 #endif
33
34 //--------------------------------------------------------------------------
35 // Table of Jpeg encoding process names
36 static const TagTable_t ProcessTable[] = {
37 { M_SOF0, "Baseline", 0, 0},
38 { M_SOF1, "Extended sequential", 0, 0},
39 { M_SOF2, "Progressive", 0, 0},
40 { M_SOF3, "Lossless", 0, 0},
41 { M_SOF5, "Differential sequential", 0, 0},
42 { M_SOF6, "Differential progressive", 0, 0},
43 { M_SOF7, "Differential lossless", 0, 0},
44 { M_SOF9, "Extended sequential, arithmetic coding", 0, 0},
45 { M_SOF10, "Progressive, arithmetic coding", 0, 0},
46 { M_SOF11, "Lossless, arithmetic coding", 0, 0},
47 { M_SOF13, "Differential sequential, arithmetic coding", 0, 0},
48 { M_SOF14, "Differential progressive, arithmetic coding", 0, 0},
49 { M_SOF15, "Differential lossless, arithmetic coding", 0, 0},
50 };
51
52 #define PROCESS_TABLE_SIZE (sizeof(ProcessTable) / sizeof(TagTable_t))
53
54 // 1 - "The 0th row is at the visual top of the image, and the 0th column is the visual left-hand side."
55 // 2 - "The 0th row is at the visual top of the image, and the 0th column is the visual right-hand side."
56 // 3 - "The 0th row is at the visual bottom of the image, and the 0th column is the visual right-hand side."
57 // 4 - "The 0th row is at the visual bottom of the image, and the 0th column is the visual left-hand side."
58
59 // 5 - "The 0th row is the visual left-hand side of of the image, and the 0th column is the visual top."
60 // 6 - "The 0th row is the visual right-hand side of of the image, and the 0th column is the visual top."
61 // 7 - "The 0th row is the visual right-hand side of of the image, and the 0th column is the visual bottom."
62 // 8 - "The 0th row is the visual left-hand side of of the image, and the 0th column is the visual bottom."
63
64 // Note: The descriptions here are the same as the name of the command line
65 // option to pass to jpegtran to right the image
66
67 static const char * OrientTab[9] = {
68 "Undefined",
69 "Normal", // 1
70 "flip horizontal", // left right reversed mirror
71 "rotate 180", // 3
72 "flip vertical", // upside down mirror
73 "transpose", // Flipped about top-left <--> bottom-right axis.
74 "rotate 90", // rotate 90 cw to right it.
75 "transverse", // flipped about top-right <--> bottom-left axis
76 "rotate 270", // rotate 270 to right it.
77 };
78
79 const int BytesPerFormat[] = {0,1,1,2,4,8,1,1,2,4,8,4,8};
80
81 //--------------------------------------------------------------------------
82 // Describes tag values
83
84 #define TAG_INTEROP_INDEX 0x0001
85 #define TAG_INTEROP_VERSION 0x0002
86 #define TAG_IMAGE_WIDTH 0x0100
87 #define TAG_IMAGE_LENGTH 0x0101
88 #define TAG_BITS_PER_SAMPLE 0x0102
89 #define TAG_COMPRESSION 0x0103
90 #define TAG_PHOTOMETRIC_INTERP 0x0106
91 #define TAG_FILL_ORDER 0x010A
92 #define TAG_DOCUMENT_NAME 0x010D
93 #define TAG_IMAGE_DESCRIPTION 0x010E
94 #define TAG_MAKE 0x010F
95 #define TAG_MODEL 0x0110
96 #define TAG_SRIP_OFFSET 0x0111
97 #define TAG_ORIENTATION 0x0112
98 #define TAG_SAMPLES_PER_PIXEL 0x0115
99 #define TAG_ROWS_PER_STRIP 0x0116
100 #define TAG_STRIP_BYTE_COUNTS 0x0117
101 #define TAG_X_RESOLUTION 0x011A
102 #define TAG_Y_RESOLUTION 0x011B
103 #define TAG_PLANAR_CONFIGURATION 0x011C
104 #define TAG_RESOLUTION_UNIT 0x0128
105 #define TAG_TRANSFER_FUNCTION 0x012D
106 #define TAG_SOFTWARE 0x0131
107 #define TAG_DATETIME 0x0132
108 #define TAG_ARTIST 0x013B
109 #define TAG_WHITE_POINT 0x013E
110 #define TAG_PRIMARY_CHROMATICITIES 0x013F
111 #define TAG_TRANSFER_RANGE 0x0156
112 #define TAG_JPEG_PROC 0x0200
113 #define TAG_THUMBNAIL_OFFSET 0x0201
114 #define TAG_THUMBNAIL_LENGTH 0x0202
115 #define TAG_Y_CB_CR_COEFFICIENTS 0x0211
116 #define TAG_Y_CB_CR_SUB_SAMPLING 0x0212
117 #define TAG_Y_CB_CR_POSITIONING 0x0213
118 #define TAG_REFERENCE_BLACK_WHITE 0x0214
119 #define TAG_RELATED_IMAGE_WIDTH 0x1001
120 #define TAG_RELATED_IMAGE_LENGTH 0x1002
121 #define TAG_CFA_REPEAT_PATTERN_DIM 0x828D
122 #define TAG_CFA_PATTERN1 0x828E
123 #define TAG_BATTERY_LEVEL 0x828F
124 #define TAG_COPYRIGHT 0x8298
125 #define TAG_EXPOSURETIME 0x829A
126 #define TAG_FNUMBER 0x829D
127 #define TAG_IPTC_NAA 0x83BB
128 #define TAG_EXIF_OFFSET 0x8769
129 #define TAG_INTER_COLOR_PROFILE 0x8773
130 #define TAG_EXPOSURE_PROGRAM 0x8822
131 #define TAG_SPECTRAL_SENSITIVITY 0x8824
132 #define TAG_GPSINFO 0x8825
133 #define TAG_ISO_EQUIVALENT 0x8827
134 #define TAG_OECF 0x8828
135 #define TAG_EXIF_VERSION 0x9000
136 #define TAG_DATETIME_ORIGINAL 0x9003
137 #define TAG_DATETIME_DIGITIZED 0x9004
138 #define TAG_COMPONENTS_CONFIG 0x9101
139 #define TAG_CPRS_BITS_PER_PIXEL 0x9102
140 #define TAG_SHUTTERSPEED 0x9201
141 #define TAG_APERTURE 0x9202
142 #define TAG_BRIGHTNESS_VALUE 0x9203
143 #define TAG_EXPOSURE_BIAS 0x9204
144 #define TAG_MAXAPERTURE 0x9205
145 #define TAG_SUBJECT_DISTANCE 0x9206
146 #define TAG_METERING_MODE 0x9207
147 #define TAG_LIGHT_SOURCE 0x9208
148 #define TAG_FLASH 0x9209
149 #define TAG_FOCALLENGTH 0x920A
150 #define TAG_MAKER_NOTE 0x927C
151 #define TAG_USERCOMMENT 0x9286
152 #define TAG_SUBSEC_TIME 0x9290
153 #define TAG_SUBSEC_TIME_ORIG 0x9291
154 #define TAG_SUBSEC_TIME_DIG 0x9292
155
156 #define TAG_WINXP_TITLE 0x9c9b // Windows XP - not part of exif standard.
157 #define TAG_WINXP_COMMENT 0x9c9c // Windows XP - not part of exif standard.
158 #define TAG_WINXP_AUTHOR 0x9c9d // Windows XP - not part of exif standard.
159 #define TAG_WINXP_KEYWORDS 0x9c9e // Windows XP - not part of exif standard.
160 #define TAG_WINXP_SUBJECT 0x9c9f // Windows XP - not part of exif standard.
161
162 #define TAG_FLASH_PIX_VERSION 0xA000
163 #define TAG_COLOR_SPACE 0xA001
164 #define TAG_EXIF_IMAGEWIDTH 0xA002
165 #define TAG_EXIF_IMAGELENGTH 0xA003
166 #define TAG_RELATED_AUDIO_FILE 0xA004
167 #define TAG_INTEROP_OFFSET 0xA005
168 #define TAG_FLASH_ENERGY 0xA20B
169 #define TAG_SPATIAL_FREQ_RESP 0xA20C
170 #define TAG_FOCAL_PLANE_XRES 0xA20E
171 #define TAG_FOCAL_PLANE_YRES 0xA20F
172 #define TAG_FOCAL_PLANE_UNITS 0xA210
173 #define TAG_SUBJECT_LOCATION 0xA214
174 #define TAG_EXPOSURE_INDEX 0xA215
175 #define TAG_SENSING_METHOD 0xA217
176 #define TAG_FILE_SOURCE 0xA300
177 #define TAG_SCENE_TYPE 0xA301
178 #define TAG_CFA_PATTERN 0xA302
179 #define TAG_CUSTOM_RENDERED 0xA401
180 #define TAG_EXPOSURE_MODE 0xA402
181 #define TAG_WHITEBALANCE 0xA403
182 #define TAG_DIGITALZOOMRATIO 0xA404
183 #define TAG_FOCALLENGTH_35MM 0xA405
184 #define TAG_SCENE_CAPTURE_TYPE 0xA406
185 #define TAG_GAIN_CONTROL 0xA407
186 #define TAG_CONTRAST 0xA408
187 #define TAG_SATURATION 0xA409
188 #define TAG_SHARPNESS 0xA40A
189 #define TAG_DISTANCE_RANGE 0xA40C
190
191 // TODO: replace the ", 0" values in this table with the correct format, e.g. ", FMT_USHORT"
192 static const TagTable_t TagTable[] = {
193 { TAG_INTEROP_INDEX, "InteropIndex", 0, 0},
194 { TAG_INTEROP_VERSION, "InteropVersion", 0, 0},
195 { TAG_IMAGE_WIDTH, "ImageWidth", FMT_USHORT, 1},
196 { TAG_IMAGE_LENGTH, "ImageLength", FMT_USHORT, 1},
197 { TAG_BITS_PER_SAMPLE, "BitsPerSample", FMT_USHORT, 3},
198 { TAG_COMPRESSION, "Compression", FMT_USHORT, 1},
199 { TAG_PHOTOMETRIC_INTERP, "PhotometricInterpretation", FMT_USHORT, 1},
200 { TAG_FILL_ORDER, "FillOrder", 0, 0},
201 { TAG_DOCUMENT_NAME, "DocumentName", 0, 0},
202 { TAG_IMAGE_DESCRIPTION, "ImageDescription", 0, 0 },
203 { TAG_MAKE, "Make", FMT_STRING, -1},
204 { TAG_MODEL, "Model", FMT_STRING, -1},
205 { TAG_SRIP_OFFSET, "StripOffsets", FMT_USHORT, 1},
206 { TAG_ORIENTATION, "Orientation", FMT_USHORT, 1},
207 { TAG_SAMPLES_PER_PIXEL, "SamplesPerPixel", FMT_USHORT, 3},
208 { TAG_ROWS_PER_STRIP, "RowsPerStrip", FMT_USHORT, 1},
209 { TAG_STRIP_BYTE_COUNTS, "StripByteCounts", FMT_USHORT, 1},
210 { TAG_X_RESOLUTION, "XResolution", FMT_URATIONAL, 1},
211 { TAG_Y_RESOLUTION, "YResolution", FMT_URATIONAL, 1},
212 { TAG_PLANAR_CONFIGURATION, "PlanarConfiguration", FMT_USHORT, 1},
213 { TAG_RESOLUTION_UNIT, "ResolutionUnit", FMT_USHORT, 1},
214 { TAG_TRANSFER_FUNCTION, "TransferFunction", FMT_USHORT, 768},
215 { TAG_SOFTWARE, "Software", FMT_STRING, -1},
216 { TAG_DATETIME, "DateTime", FMT_STRING, 20},
217 { TAG_ARTIST, "Artist", FMT_STRING, -1},
218 { TAG_WHITE_POINT, "WhitePoint", FMT_SRATIONAL, 2},
219 { TAG_PRIMARY_CHROMATICITIES, "PrimaryChromaticities", FMT_SRATIONAL, 6},
220 { TAG_TRANSFER_RANGE, "TransferRange", 0, 0},
221 { TAG_JPEG_PROC, "JPEGProc", 0, 0},
222 { TAG_THUMBNAIL_OFFSET, "ThumbnailOffset", 0, 0},
223 { TAG_THUMBNAIL_LENGTH, "ThumbnailLength", 0, 0},
224 { TAG_Y_CB_CR_COEFFICIENTS, "YCbCrCoefficients", FMT_SRATIONAL, 3},
225 { TAG_Y_CB_CR_SUB_SAMPLING, "YCbCrSubSampling", FMT_USHORT, 2},
226 { TAG_Y_CB_CR_POSITIONING, "YCbCrPositioning", FMT_USHORT, 1},
227 { TAG_REFERENCE_BLACK_WHITE, "ReferenceBlackWhite", FMT_SRATIONAL, 6},
228 { TAG_RELATED_IMAGE_WIDTH, "RelatedImageWidth", 0, 0},
229 { TAG_RELATED_IMAGE_LENGTH, "RelatedImageLength", 0, 0},
230 { TAG_CFA_REPEAT_PATTERN_DIM, "CFARepeatPatternDim", 0, 0},
231 { TAG_CFA_PATTERN1, "CFAPattern", 0, 0},
232 { TAG_BATTERY_LEVEL, "BatteryLevel", 0, 0},
233 { TAG_COPYRIGHT, "Copyright", FMT_STRING, -1},
234 { TAG_EXPOSURETIME, "ExposureTime", FMT_SRATIONAL, 1},
235 { TAG_FNUMBER, "FNumber", FMT_SRATIONAL, 1},
236 { TAG_IPTC_NAA, "IPTC/NAA", 0, 0},
237 { TAG_EXIF_OFFSET, "ExifOffset", 0, 0},
238 { TAG_INTER_COLOR_PROFILE, "InterColorProfile", 0, 0},
239 { TAG_EXPOSURE_PROGRAM, "ExposureProgram", FMT_SSHORT, 1},
240 { TAG_SPECTRAL_SENSITIVITY, "SpectralSensitivity", FMT_STRING, -1},
241 { TAG_GPSINFO, "GPS Dir offset", 0, 0},
242 { TAG_ISO_EQUIVALENT, "ISOSpeedRatings", FMT_SSHORT, -1},
243 { TAG_OECF, "OECF", 0, 0},
244 { TAG_EXIF_VERSION, "ExifVersion", FMT_BYTE, 4},
245 { TAG_DATETIME_ORIGINAL, "DateTimeOriginal", FMT_STRING, 20},
246 { TAG_DATETIME_DIGITIZED, "DateTimeDigitized", FMT_STRING, 20},
247 { TAG_COMPONENTS_CONFIG, "ComponentsConfiguration", FMT_BYTE, 4},
248 { TAG_CPRS_BITS_PER_PIXEL, "CompressedBitsPerPixel", FMT_SRATIONAL, 1},
249 { TAG_SHUTTERSPEED, "ShutterSpeedValue", FMT_SRATIONAL, 1},
250 { TAG_APERTURE, "ApertureValue", FMT_URATIONAL, 1},
251 { TAG_BRIGHTNESS_VALUE, "BrightnessValue", FMT_SRATIONAL, 1},
252 { TAG_EXPOSURE_BIAS, "ExposureBiasValue", FMT_SRATIONAL, 1},
253 { TAG_MAXAPERTURE, "MaxApertureValue", FMT_URATIONAL, 1},
254 { TAG_SUBJECT_DISTANCE, "SubjectDistance", FMT_URATIONAL, 1},
255 { TAG_METERING_MODE, "MeteringMode", FMT_USHORT, 1},
256 { TAG_LIGHT_SOURCE, "LightSource", FMT_USHORT, 1},
257 { TAG_FLASH, "Flash", FMT_USHORT, 1},
258 { TAG_FOCALLENGTH, "FocalLength", FMT_URATIONAL, 1},
259 { TAG_MAKER_NOTE, "MakerNote", FMT_STRING, -1},
260 { TAG_USERCOMMENT, "UserComment", FMT_STRING, -1},
261 { TAG_SUBSEC_TIME, "SubSecTime", FMT_STRING, -1},
262 { TAG_SUBSEC_TIME_ORIG, "SubSecTimeOriginal", FMT_STRING, -1},
263 { TAG_SUBSEC_TIME_DIG, "SubSecTimeDigitized", FMT_STRING, -1},
264 { TAG_WINXP_TITLE, "Windows-XP Title", 0, 0},
265 { TAG_WINXP_COMMENT, "Windows-XP comment", 0, 0},
266 { TAG_WINXP_AUTHOR, "Windows-XP author", 0, 0},
267 { TAG_WINXP_KEYWORDS, "Windows-XP keywords", 0, 0},
268 { TAG_WINXP_SUBJECT, "Windows-XP subject", 0, 0},
269 { TAG_FLASH_PIX_VERSION, "FlashPixVersion", FMT_BYTE, 4},
270 { TAG_COLOR_SPACE, "ColorSpace", FMT_USHORT, 1},
271 { TAG_EXIF_IMAGEWIDTH, "ExifImageWidth", 0, 0},
272 { TAG_EXIF_IMAGELENGTH, "ExifImageLength", 0, 0},
273 { TAG_RELATED_AUDIO_FILE, "RelatedAudioFile", 0, 0},
274 { TAG_INTEROP_OFFSET, "InteroperabilityOffset", 0, 0},
275 { TAG_FLASH_ENERGY, "FlashEnergy", FMT_URATIONAL, 1},
276 { TAG_SPATIAL_FREQ_RESP, "SpatialFrequencyResponse", FMT_STRING, -1},
277 { TAG_FOCAL_PLANE_XRES, "FocalPlaneXResolution", FMT_URATIONAL, 1},
278 { TAG_FOCAL_PLANE_YRES, "FocalPlaneYResolution", FMT_URATIONAL, 1},
279 { TAG_FOCAL_PLANE_UNITS, "FocalPlaneResolutionUnit", FMT_USHORT, 1},
280 { TAG_SUBJECT_LOCATION, "SubjectLocation", FMT_USHORT, 2},
281 { TAG_EXPOSURE_INDEX, "ExposureIndex", FMT_URATIONAL, 1},
282 { TAG_SENSING_METHOD, "SensingMethod", FMT_USHORT, 1},
283 { TAG_FILE_SOURCE, "FileSource", 0, 1},
284 { TAG_SCENE_TYPE, "SceneType", 0, 1},
285 { TAG_CFA_PATTERN, "CFA Pattern", 0, -1},
286 { TAG_CUSTOM_RENDERED, "CustomRendered", FMT_USHORT, 1},
287 { TAG_EXPOSURE_MODE, "ExposureMode", FMT_USHORT, 1},
288 { TAG_WHITEBALANCE, "WhiteBalance", FMT_USHORT, 1},
289 { TAG_DIGITALZOOMRATIO, "DigitalZoomRatio", FMT_URATIONAL, 1},
290 { TAG_FOCALLENGTH_35MM, "FocalLengthIn35mmFilm", FMT_USHORT, 1},
291 { TAG_SCENE_CAPTURE_TYPE, "SceneCaptureType", FMT_USHORT, 1},
292 { TAG_GAIN_CONTROL, "GainControl", FMT_URATIONAL, 1},
293 { TAG_CONTRAST, "Contrast", FMT_USHORT, 1},
294 { TAG_SATURATION, "Saturation", FMT_USHORT, 1},
295 { TAG_SHARPNESS, "Sharpness", FMT_USHORT, 1},
296 { TAG_DISTANCE_RANGE, "SubjectDistanceRange", FMT_USHORT, 1},
297 } ;
298
299 #define TAG_TABLE_SIZE (sizeof(TagTable) / sizeof(TagTable_t))
300
TagNameToValue(const char * tagName)301 int TagNameToValue(const char* tagName)
302 {
303 unsigned int i;
304 for (i = 0; i < TAG_TABLE_SIZE; i++) {
305 if (strcmp(TagTable[i].Desc, tagName) == 0) {
306 printf("found tag %s val %d", TagTable[i].Desc, TagTable[i].Tag);
307 return TagTable[i].Tag;
308 }
309 }
310 printf("tag %s NOT FOUND", tagName);
311 return -1;
312 }
313
IsDateTimeTag(unsigned short tag)314 int IsDateTimeTag(unsigned short tag)
315 {
316 return ((tag == TAG_DATETIME)? TRUE: FALSE);
317 }
318
319 //--------------------------------------------------------------------------
320 // Convert a 16 bit unsigned value to file's native byte order
321 //--------------------------------------------------------------------------
Put16u(void * Short,unsigned short PutValue)322 static void Put16u(void * Short, unsigned short PutValue)
323 {
324 if (MotorolaOrder){
325 ((uchar *)Short)[0] = (uchar)(PutValue>>8);
326 ((uchar *)Short)[1] = (uchar)PutValue;
327 }else{
328 ((uchar *)Short)[0] = (uchar)PutValue;
329 ((uchar *)Short)[1] = (uchar)(PutValue>>8);
330 }
331 }
332
333 //--------------------------------------------------------------------------
334 // Convert a 16 bit unsigned value from file's native byte order
335 //--------------------------------------------------------------------------
Get16u(void * Short)336 int Get16u(void * Short)
337 {
338 if (MotorolaOrder){
339 return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
340 }else{
341 return (((uchar *)Short)[1] << 8) | ((uchar *)Short)[0];
342 }
343 }
344
345 //--------------------------------------------------------------------------
346 // Convert a 32 bit signed value from file's native byte order
347 //--------------------------------------------------------------------------
Get32s(void * Long)348 int Get32s(void * Long)
349 {
350 if (MotorolaOrder){
351 return ((( char *)Long)[0] << 24) | (((uchar *)Long)[1] << 16)
352 | (((uchar *)Long)[2] << 8 ) | (((uchar *)Long)[3] << 0 );
353 }else{
354 return ((( char *)Long)[3] << 24) | (((uchar *)Long)[2] << 16)
355 | (((uchar *)Long)[1] << 8 ) | (((uchar *)Long)[0] << 0 );
356 }
357 }
358
359 //--------------------------------------------------------------------------
360 // Convert a 32 bit unsigned value to file's native byte order
361 //--------------------------------------------------------------------------
Put32u(void * Value,unsigned PutValue)362 void Put32u(void * Value, unsigned PutValue)
363 {
364 if (MotorolaOrder){
365 ((uchar *)Value)[0] = (uchar)(PutValue>>24);
366 ((uchar *)Value)[1] = (uchar)(PutValue>>16);
367 ((uchar *)Value)[2] = (uchar)(PutValue>>8);
368 ((uchar *)Value)[3] = (uchar)PutValue;
369 }else{
370 ((uchar *)Value)[0] = (uchar)PutValue;
371 ((uchar *)Value)[1] = (uchar)(PutValue>>8);
372 ((uchar *)Value)[2] = (uchar)(PutValue>>16);
373 ((uchar *)Value)[3] = (uchar)(PutValue>>24);
374 }
375 }
376
377 //--------------------------------------------------------------------------
378 // Convert a 32 bit unsigned value from file's native byte order
379 //--------------------------------------------------------------------------
Get32u(void * Long)380 unsigned Get32u(void * Long)
381 {
382 return (unsigned)Get32s(Long) & 0xffffffff;
383 }
384
385 //--------------------------------------------------------------------------
386 // Display a number as one of its many formats
387 //--------------------------------------------------------------------------
PrintFormatNumber(void * ValuePtr,int Format,int ByteCount)388 void PrintFormatNumber(void * ValuePtr, int Format, int ByteCount)
389 {
390 int s,n;
391
392 for(n=0;n<16;n++){
393 switch(Format){
394 case FMT_SBYTE:
395 case FMT_BYTE: printf("%02x",*(uchar *)ValuePtr); s=1; break;
396 case FMT_USHORT: printf("%d",Get16u(ValuePtr)); s=2; break;
397 case FMT_ULONG:
398 case FMT_SLONG: printf("%d",Get32s(ValuePtr)); s=4; break;
399 case FMT_SSHORT: printf("%hd",(signed short)Get16u(ValuePtr)); s=2; break;
400 case FMT_URATIONAL:
401 case FMT_SRATIONAL:
402 printf("%d/%d",Get32s(ValuePtr), Get32s(4+(char *)ValuePtr));
403 s = 8;
404 break;
405
406 case FMT_SINGLE: printf("%f",(double)*(float *)ValuePtr); s=8; break;
407 case FMT_DOUBLE: printf("%f",*(double *)ValuePtr); s=8; break;
408 default:
409 printf("Unknown format %d:", Format);
410 return;
411 }
412 ByteCount -= s;
413 if (ByteCount <= 0) break;
414 printf(", ");
415 ValuePtr = (void *)((char *)ValuePtr + s);
416
417 }
418 if (n >= 16) printf("...");
419 }
420
421
422 //--------------------------------------------------------------------------
423 // Evaluate number, be it int, rational, or float from directory.
424 //--------------------------------------------------------------------------
ConvertAnyFormat(void * ValuePtr,int Format)425 double ConvertAnyFormat(void * ValuePtr, int Format)
426 {
427 double Value;
428 Value = 0;
429
430 switch(Format){
431 case FMT_SBYTE: Value = *(signed char *)ValuePtr; break;
432 case FMT_BYTE: Value = *(uchar *)ValuePtr; break;
433
434 case FMT_USHORT: Value = Get16u(ValuePtr); break;
435 case FMT_ULONG: Value = Get32u(ValuePtr); break;
436
437 case FMT_URATIONAL:
438 case FMT_SRATIONAL:
439 {
440 int Num,Den;
441 Num = Get32s(ValuePtr);
442 Den = Get32s(4+(char *)ValuePtr);
443 if (Den == 0){
444 Value = 0;
445 }else{
446 Value = (double)Num/Den;
447 }
448 break;
449 }
450
451 case FMT_SSHORT: Value = (signed short)Get16u(ValuePtr); break;
452 case FMT_SLONG: Value = Get32s(ValuePtr); break;
453
454 // Not sure if this is correct (never seen float used in Exif format)
455 case FMT_SINGLE: Value = (double)*(float *)ValuePtr; break;
456 case FMT_DOUBLE: Value = *(double *)ValuePtr; break;
457
458 default:
459 ErrNonfatal("Illegal format code %d",Format,0);
460 }
461 return Value;
462 }
463
464 //--------------------------------------------------------------------------
465 // Convert a double value into a signed or unsigned rational number.
466 //--------------------------------------------------------------------------
float2urat(double value,unsigned int max,unsigned int * numerator,unsigned int * denominator)467 static void float2urat(double value, unsigned int max, unsigned int *numerator,
468 unsigned int *denominator) {
469 if (value <= 0) {
470 *numerator = 0;
471 *denominator = 1;
472 return;
473 }
474
475 if (value > max) {
476 *numerator = max;
477 *denominator = 1;
478 return;
479 }
480
481 // For values less than 1e-9, scale as much as possible
482 if (value < 1e-9) {
483 unsigned int n = (unsigned int)(value * max);
484 if (n == 0) {
485 *numerator = 0;
486 *denominator = 1;
487 } else {
488 *numerator = n;
489 *denominator = max;
490 }
491 return;
492 }
493
494 // Try to use a denominator of 1e9, 1e8, ..., until the numerator fits
495 unsigned int d;
496 for (d = 1000000000; d >= 1; d /= 10) {
497 double s = value * d;
498 if (s <= max) {
499 // Remove the trailing zeros from both.
500 unsigned int n = (unsigned int)s;
501 while (n % 10 == 0 && d >= 10) {
502 n /= 10;
503 d /= 10;
504 }
505 *numerator = n;
506 *denominator = d;
507 return;
508 }
509 }
510
511 // Shouldn't reach here because the denominator 1 should work
512 // above. But just in case.
513 *numerator = 0;
514 *denominator = 1;
515 }
516
ConvertDoubleToURational(double value,unsigned int * numerator,unsigned int * denominator)517 static void ConvertDoubleToURational(double value, unsigned int *numerator,
518 unsigned int *denominator) {
519 float2urat(value, 0xFFFFFFFFU, numerator, denominator);
520 }
521
ConvertDoubleToSRational(double value,int * numerator,int * denominator)522 static void ConvertDoubleToSRational(double value, int *numerator,
523 int *denominator) {
524 int negative = 0;
525
526 if (value < 0) {
527 value = -value;
528 negative = 1;
529 }
530
531 unsigned int n, d;
532 float2urat(value, 0x7FFFFFFFU, &n, &d);
533 *numerator = (int)n;
534 *denominator = (int)d;
535 if (negative) {
536 *numerator = -*numerator;
537 }
538 }
539
540 //--------------------------------------------------------------------------
541 // Process one of the nested EXIF directories.
542 //--------------------------------------------------------------------------
ProcessExifDir(unsigned char * DirStart,unsigned char * OffsetBase,unsigned ExifLength,int NestingLevel)543 static void ProcessExifDir(unsigned char * DirStart, unsigned char * OffsetBase,
544 unsigned ExifLength, int NestingLevel)
545 {
546 int de;
547 int a;
548 int NumDirEntries;
549 unsigned ThumbnailOffset = 0;
550 unsigned ThumbnailSize = 0;
551 char IndentString[25];
552
553 printf("ProcessExifDir");
554 if (NestingLevel > 4){
555 ErrNonfatal("Maximum directory nesting exceeded (corrupt exif header)", 0,0);
556 return;
557 }
558
559 memset(IndentString, ' ', 25);
560 IndentString[NestingLevel * 4] = '\0';
561
562
563 NumDirEntries = Get16u(DirStart);
564 #define DIR_ENTRY_ADDR(Start, Entry) (Start+2+12*(Entry))
565
566 {
567 unsigned char * DirEnd;
568 DirEnd = DIR_ENTRY_ADDR(DirStart, NumDirEntries);
569 if (DirEnd+4 > (OffsetBase+ExifLength)){
570 if (DirEnd+2 == OffsetBase+ExifLength || DirEnd == OffsetBase+ExifLength){
571 // Version 1.3 of jhead would truncate a bit too much.
572 // This also caught later on as well.
573 }else{
574 ErrNonfatal("Illegally sized exif subdirectory (%d entries)",NumDirEntries,0);
575 return;
576 }
577 }
578 if (DumpExifMap){
579 printf("Map: %05d-%05d: Directory\n",(int)(DirStart-OffsetBase), (int)(DirEnd+4-OffsetBase));
580 }
581
582
583 }
584
585 if (ShowTags){
586 printf("(dir has %d entries)\n",NumDirEntries);
587 }
588
589 for (de=0;de<NumDirEntries;de++){
590 int Tag, Format, Components;
591 unsigned char * ValuePtr;
592 int ByteCount;
593 unsigned char * DirEntry;
594 DirEntry = DIR_ENTRY_ADDR(DirStart, de);
595
596 Tag = Get16u(DirEntry);
597 Format = Get16u(DirEntry+2);
598 Components = Get32u(DirEntry+4);
599
600 if ((Format-1) >= NUM_FORMATS) {
601 // (-1) catches illegal zero case as unsigned underflows to positive large.
602 ErrNonfatal("Illegal number format %d for tag %04x", Format, Tag);
603 continue;
604 }
605
606 if ((unsigned)Components > 0x10000){
607 ErrNonfatal("Illegal number of components %d for tag %04x", Components, Tag);
608 continue;
609 }
610
611 ByteCount = Components * BytesPerFormat[Format];
612
613 if (ByteCount > 4){
614 unsigned OffsetVal;
615 OffsetVal = Get32u(DirEntry+8);
616 // If its bigger than 4 bytes, the dir entry contains an offset.
617 if (OffsetVal+ByteCount > ExifLength){
618 // Bogus pointer offset and / or bytecount value
619 ErrNonfatal("Illegal value pointer for tag %04x", Tag,0);
620 continue;
621 }
622 ValuePtr = OffsetBase+OffsetVal;
623
624 if (OffsetVal > ImageInfo.LargestExifOffset){
625 ImageInfo.LargestExifOffset = OffsetVal;
626 }
627
628 if (DumpExifMap){
629 printf("Map: %05d-%05d: Data for tag %04x\n",OffsetVal, OffsetVal+ByteCount, Tag);
630 }
631 }else{
632 // 4 bytes or less and value is in the dir entry itself
633 ValuePtr = DirEntry+8;
634 }
635
636 if (Tag == TAG_MAKER_NOTE){
637 if (ShowTags){
638 printf("%s Maker note: ",IndentString);
639 }
640 ProcessMakerNote(ValuePtr, ByteCount, OffsetBase, ExifLength);
641 continue;
642 }
643
644 if (ShowTags){
645 // Show tag name
646 for (a=0;;a++){
647 if (a >= (int)TAG_TABLE_SIZE){
648 printf("%s", IndentString);
649 printf(" Unknown Tag %04x Value = ", Tag);
650 break;
651 }
652 if (TagTable[a].Tag == Tag){
653 printf("%s", IndentString);
654 printf(" %s = ",TagTable[a].Desc);
655 break;
656 }
657 }
658
659 // Show tag value.
660 switch(Format){
661 case FMT_BYTE:
662 if(ByteCount>1){
663 printf("%.*ls\n", ByteCount/2, (wchar_t *)ValuePtr);
664 }else{
665 PrintFormatNumber(ValuePtr, Format, ByteCount);
666 printf("\n");
667 }
668 break;
669
670 case FMT_UNDEFINED:
671 // Undefined is typically an ascii string.
672
673 case FMT_STRING:
674 // String arrays printed without function call (different from int arrays)
675 {
676 printf("\"%s\"", ValuePtr);
677 // int NoPrint = 0;
678 // printf("\"");
679 // for (a=0;a<ByteCount;a++){
680 // if (ValuePtr[a] >= 32){
681 // putchar(ValuePtr[a]);
682 // NoPrint = 0;
683 // }else{
684 // // Avoiding indicating too many unprintable characters of proprietary
685 // // bits of binary information this program may not know how to parse.
686 // if (!NoPrint && a != ByteCount-1){
687 // putchar('?');
688 // NoPrint = 1;
689 // }
690 // }
691 // }
692 // printf("\"\n");
693 }
694 break;
695
696 default:
697 // Handle arrays of numbers later (will there ever be?)
698 PrintFormatNumber(ValuePtr, Format, ByteCount);
699 printf("\n");
700 }
701 }
702
703 // Extract useful components of tag
704 switch(Tag){
705
706 case TAG_MAKE:
707 strncpy(ImageInfo.CameraMake, (char *)ValuePtr, ByteCount < 31 ? ByteCount : 31);
708 break;
709
710 case TAG_MODEL:
711 strncpy(ImageInfo.CameraModel, (char *)ValuePtr, ByteCount < 39 ? ByteCount : 39);
712 break;
713
714 case TAG_SUBSEC_TIME:
715 strlcpy(ImageInfo.SubSecTime, (char *)ValuePtr, sizeof(ImageInfo.SubSecTime));
716 break;
717
718 case TAG_SUBSEC_TIME_ORIG:
719 strlcpy(ImageInfo.SubSecTimeOrig, (char *)ValuePtr,
720 sizeof(ImageInfo.SubSecTimeOrig));
721 break;
722
723 case TAG_SUBSEC_TIME_DIG:
724 strlcpy(ImageInfo.SubSecTimeDig, (char *)ValuePtr,
725 sizeof(ImageInfo.SubSecTimeDig));
726 break;
727
728 case TAG_DATETIME_DIGITIZED:
729 strlcpy(ImageInfo.DigitizedTime, (char *)ValuePtr,
730 sizeof(ImageInfo.DigitizedTime));
731
732 if (ImageInfo.numDateTimeTags >= MAX_DATE_COPIES){
733 ErrNonfatal("More than %d date fields! This is nuts", MAX_DATE_COPIES, 0);
734 break;
735 }
736 ImageInfo.DateTimeOffsets[ImageInfo.numDateTimeTags++] =
737 (char *)ValuePtr - (char *)OffsetBase;
738 break;
739
740 case TAG_DATETIME_ORIGINAL:
741 // If we get a DATETIME_ORIGINAL, we use that one.
742 strncpy(ImageInfo.DateTime, (char *)ValuePtr, 19);
743 // Fallthru...
744
745 case TAG_DATETIME:
746 if (!isdigit(ImageInfo.DateTime[0])){
747 // If we don't already have a DATETIME_ORIGINAL, use whatever
748 // time fields we may have.
749 strncpy(ImageInfo.DateTime, (char *)ValuePtr, 19);
750 }
751
752 if (ImageInfo.numDateTimeTags >= MAX_DATE_COPIES){
753 ErrNonfatal("More than %d date fields! This is nuts", MAX_DATE_COPIES, 0);
754 break;
755 }
756 ImageInfo.DateTimeOffsets[ImageInfo.numDateTimeTags++] =
757 (char *)ValuePtr - (char *)OffsetBase;
758 break;
759
760 case TAG_WINXP_COMMENT:
761 if (ImageInfo.Comments[0]){ // We already have a jpeg comment.
762 // Already have a comment (probably windows comment), skip this one.
763 if (ShowTags) printf("Windows XP commend and other comment in header\n");
764 break; // Already have a windows comment, skip this one.
765 }
766
767 if (ByteCount > 1){
768 if (ByteCount > MAX_COMMENT_SIZE) ByteCount = MAX_COMMENT_SIZE;
769 memcpy(ImageInfo.Comments, ValuePtr, ByteCount);
770 ImageInfo.CommentWidchars = ByteCount/2;
771 }
772 break;
773
774 case TAG_USERCOMMENT:
775 if (ImageInfo.Comments[0]){ // We already have a jpeg comment.
776 // Already have a comment (probably windows comment), skip this one.
777 if (ShowTags) printf("Multiple comments in exif header\n");
778 break; // Already have a windows comment, skip this one.
779 }
780
781 // Comment is often padded with trailing spaces. Remove these first.
782 for (a=ByteCount;;){
783 a--;
784 if ((ValuePtr)[a] == ' '){
785 (ValuePtr)[a] = '\0';
786 }else{
787 break;
788 }
789 if (a == 0) break;
790 }
791
792 // Copy the comment
793 {
794 // We want to set copied comment length (msize) to be the
795 // minimum of:
796 // (1) The space still available in Exif
797 // (2) The given comment length (ByteCount)
798 // (3) MAX_COMMENT_SIZE - 1
799 int msiz = ExifLength - (ValuePtr-OffsetBase);
800 if (msiz > ByteCount) msiz = ByteCount;
801 if (msiz > MAX_COMMENT_SIZE - 1) msiz = MAX_COMMENT_SIZE - 1;
802 if (msiz > 5 && memcmp(ValuePtr, "ASCII", 5) == 0) {
803 for (a = 5; a < 10 && a < msiz; a++) {
804 int c = (ValuePtr)[a];
805 if (c != '\0' && c != ' ') {
806 strncpy(ImageInfo.Comments,
807 (char *)ValuePtr + a, msiz - a);
808 break;
809 }
810 }
811 } else {
812 strncpy(ImageInfo.Comments, (char *)ValuePtr, msiz);
813 }
814 }
815 break;
816
817 case TAG_FNUMBER:
818 // Simplest way of expressing aperture, so I trust it the most.
819 // (overwrite previously computd value if there is one)
820 ImageInfo.ApertureFNumber = (float)ConvertAnyFormat(ValuePtr, Format);
821 break;
822
823 case TAG_APERTURE:
824 case TAG_MAXAPERTURE:
825 // More relevant info always comes earlier, so only use this field if we don't
826 // have appropriate aperture information yet.
827 if (ImageInfo.ApertureFNumber == 0){
828 ImageInfo.ApertureFNumber
829 = (float)exp(ConvertAnyFormat(ValuePtr, Format)*log(2)*0.5);
830 }
831 break;
832
833 case TAG_FOCALLENGTH:
834 // Nice digital cameras actually save the focal length as a function
835 // of how farthey are zoomed in.
836 ImageInfo.FocalLength.num = Get32u(ValuePtr);
837 ImageInfo.FocalLength.denom = Get32u(4+(char *)ValuePtr);
838 break;
839
840 case TAG_SUBJECT_DISTANCE:
841 // Inidcates the distacne the autofocus camera is focused to.
842 // Tends to be less accurate as distance increases.
843 ImageInfo.Distance = (float)ConvertAnyFormat(ValuePtr, Format);
844 break;
845
846 case TAG_EXPOSURETIME:
847 // Simplest way of expressing exposure time, so I trust it most.
848 // (overwrite previously computd value if there is one)
849 ImageInfo.ExposureTime = (float)ConvertAnyFormat(ValuePtr, Format);
850 break;
851
852 case TAG_SHUTTERSPEED:
853 // More complicated way of expressing exposure time, so only use
854 // this value if we don't already have it from somewhere else.
855 if (ImageInfo.ExposureTime == 0){
856 ImageInfo.ExposureTime
857 = (float)(1/exp(ConvertAnyFormat(ValuePtr, Format)*log(2)));
858 }
859 break;
860
861
862 case TAG_FLASH:
863 ImageInfo.FlashUsed=(int)ConvertAnyFormat(ValuePtr, Format);
864 break;
865
866 case TAG_ORIENTATION:
867 if (NumOrientations >= 2){
868 // Can have another orientation tag for the thumbnail, but if there's
869 // a third one, things are stringae.
870 ErrNonfatal("More than two orientation tags!",0,0);
871 break;
872 }
873 OrientationPtr[NumOrientations] = ValuePtr;
874 OrientationNumFormat[NumOrientations] = Format;
875 if (NumOrientations == 0){
876 ImageInfo.Orientation = (int)ConvertAnyFormat(ValuePtr, Format);
877 }
878 if (ImageInfo.Orientation < 0 || ImageInfo.Orientation > 8){
879 ErrNonfatal("Undefined rotation value %d", ImageInfo.Orientation, 0);
880 ImageInfo.Orientation = 0;
881 }
882 NumOrientations += 1;
883 break;
884
885 case TAG_EXIF_IMAGELENGTH:
886 case TAG_EXIF_IMAGEWIDTH:
887 // Use largest of height and width to deal with images that have been
888 // rotated to portrait format.
889 a = (int)ConvertAnyFormat(ValuePtr, Format);
890 if (ExifImageWidth < a) ExifImageWidth = a;
891 break;
892
893 case TAG_FOCAL_PLANE_XRES:
894 FocalplaneXRes = ConvertAnyFormat(ValuePtr, Format);
895 break;
896
897 case TAG_FOCAL_PLANE_UNITS:
898 switch((int)ConvertAnyFormat(ValuePtr, Format)){
899 case 1: FocalplaneUnits = 25.4; break; // inch
900 case 2:
901 // According to the information I was using, 2 means meters.
902 // But looking at the Cannon powershot's files, inches is the only
903 // sensible value.
904 FocalplaneUnits = 25.4;
905 break;
906
907 case 3: FocalplaneUnits = 10; break; // centimeter
908 case 4: FocalplaneUnits = 1; break; // millimeter
909 case 5: FocalplaneUnits = .001; break; // micrometer
910 }
911 break;
912
913 case TAG_EXPOSURE_BIAS:
914 ImageInfo.ExposureBias = (float)ConvertAnyFormat(ValuePtr, Format);
915 break;
916
917 case TAG_WHITEBALANCE:
918 ImageInfo.Whitebalance = (int)ConvertAnyFormat(ValuePtr, Format);
919 break;
920
921 case TAG_LIGHT_SOURCE:
922 ImageInfo.LightSource = (int)ConvertAnyFormat(ValuePtr, Format);
923 break;
924
925 case TAG_METERING_MODE:
926 ImageInfo.MeteringMode = (int)ConvertAnyFormat(ValuePtr, Format);
927 break;
928
929 case TAG_EXPOSURE_PROGRAM:
930 ImageInfo.ExposureProgram = (int)ConvertAnyFormat(ValuePtr, Format);
931 break;
932
933 case TAG_EXPOSURE_INDEX:
934 if (ImageInfo.ISOequivalent == 0){
935 // Exposure index and ISO equivalent are often used interchangeably,
936 // so we will do the same in jhead.
937 // http://photography.about.com/library/glossary/bldef_ei.htm
938 ImageInfo.ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
939 }
940 break;
941
942 case TAG_EXPOSURE_MODE:
943 ImageInfo.ExposureMode = (int)ConvertAnyFormat(ValuePtr, Format);
944 break;
945
946 case TAG_ISO_EQUIVALENT:
947 ImageInfo.ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
948 if ( ImageInfo.ISOequivalent < 50 ){
949 // Fixes strange encoding on some older digicams.
950 ImageInfo.ISOequivalent *= 200;
951 }
952 break;
953
954 case TAG_DIGITALZOOMRATIO:
955 ImageInfo.DigitalZoomRatio = (float)ConvertAnyFormat(ValuePtr, Format);
956 break;
957
958 case TAG_THUMBNAIL_OFFSET:
959 ThumbnailOffset = (unsigned)ConvertAnyFormat(ValuePtr, Format);
960 DirWithThumbnailPtrs = DirStart;
961 break;
962
963 case TAG_THUMBNAIL_LENGTH:
964 ThumbnailSize = (unsigned)ConvertAnyFormat(ValuePtr, Format);
965 ImageInfo.ThumbnailSizeOffset = ValuePtr-OffsetBase;
966 break;
967
968 case TAG_EXIF_OFFSET:
969 if (ShowTags) printf("%s Exif Dir:",IndentString);
970
971 case TAG_INTEROP_OFFSET:
972 if (Tag == TAG_INTEROP_OFFSET && ShowTags) printf("%s Interop Dir:",IndentString);
973 {
974 unsigned char * SubdirStart;
975 SubdirStart = OffsetBase + Get32u(ValuePtr);
976 if (SubdirStart < OffsetBase || SubdirStart > OffsetBase+ExifLength){
977 ErrNonfatal("Illegal exif or interop ofset directory link",0,0);
978 }else{
979 ProcessExifDir(SubdirStart, OffsetBase, ExifLength, NestingLevel+1);
980 }
981 continue;
982 }
983 break;
984
985 case TAG_GPSINFO:
986 if (ShowTags) printf("%s GPS info dir:",IndentString);
987 {
988 unsigned char * SubdirStart;
989 SubdirStart = OffsetBase + Get32u(ValuePtr);
990 if (SubdirStart < OffsetBase || SubdirStart > OffsetBase+ExifLength){
991 ErrNonfatal("Illegal GPS directory link",0,0);
992 }else{
993 ProcessGpsInfo(SubdirStart, ByteCount, OffsetBase, ExifLength);
994 }
995 continue;
996 }
997 break;
998
999 case TAG_FOCALLENGTH_35MM:
1000 // The focal length equivalent 35 mm is a 2.2 tag (defined as of April 2002)
1001 // if its present, use it to compute equivalent focal length instead of
1002 // computing it from sensor geometry and actual focal length.
1003 ImageInfo.FocalLength35mmEquiv = (unsigned)ConvertAnyFormat(ValuePtr, Format);
1004 break;
1005
1006 case TAG_DISTANCE_RANGE:
1007 // Three possible standard values:
1008 // 1 = macro, 2 = close, 3 = distant
1009 ImageInfo.DistanceRange = (int)ConvertAnyFormat(ValuePtr, Format);
1010 break;
1011 }
1012 }
1013
1014
1015 {
1016 // In addition to linking to subdirectories via exif tags,
1017 // there's also a potential link to another directory at the end of each
1018 // directory. this has got to be the result of a committee!
1019 unsigned char * SubdirStart;
1020 unsigned Offset;
1021
1022 if (DIR_ENTRY_ADDR(DirStart, NumDirEntries) + 4 <= OffsetBase+ExifLength){
1023 printf("DirStart %p offset from dirstart %d", DirStart, 2+12*NumDirEntries);
1024 Offset = Get32u(DirStart+2+12*NumDirEntries);
1025 if (Offset){
1026 SubdirStart = OffsetBase + Offset;
1027 if (SubdirStart > OffsetBase+ExifLength || SubdirStart < OffsetBase){
1028 printf("SubdirStart %p OffsetBase %p ExifLength %d Offset %d",
1029 SubdirStart, OffsetBase, ExifLength, Offset);
1030 if (SubdirStart > OffsetBase && SubdirStart < OffsetBase+ExifLength+20){
1031 // Jhead 1.3 or earlier would crop the whole directory!
1032 // As Jhead produces this form of format incorrectness,
1033 // I'll just let it pass silently
1034 if (ShowTags) printf("Thumbnail removed with Jhead 1.3 or earlier\n");
1035 }else{
1036 ErrNonfatal("Illegal subdirectory link",0,0);
1037 }
1038 }else{
1039 if (SubdirStart <= OffsetBase+ExifLength){
1040 if (ShowTags) printf("%s Continued directory ",IndentString);
1041 ProcessExifDir(SubdirStart, OffsetBase, ExifLength, NestingLevel+1);
1042 }
1043 }
1044 if (Offset > ImageInfo.LargestExifOffset){
1045 ImageInfo.LargestExifOffset = Offset;
1046 }
1047 }
1048 }else{
1049 // The exif header ends before the last next directory pointer.
1050 }
1051 }
1052
1053 if (ThumbnailOffset){
1054 ImageInfo.ThumbnailAtEnd = FALSE;
1055
1056 if (DumpExifMap){
1057 printf("Map: %05d-%05d: Thumbnail\n",ThumbnailOffset, ThumbnailOffset+ThumbnailSize);
1058 }
1059
1060 if (ThumbnailOffset <= ExifLength){
1061 if (ThumbnailSize > ExifLength-ThumbnailOffset){
1062 // If thumbnail extends past exif header, only save the part that
1063 // actually exists. Canon's EOS viewer utility will do this - the
1064 // thumbnail extracts ok with this hack.
1065 ThumbnailSize = ExifLength-ThumbnailOffset;
1066 if (ShowTags) printf("Thumbnail incorrectly placed in header\n");
1067
1068 }
1069 // The thumbnail pointer appears to be valid. Store it.
1070 ImageInfo.ThumbnailOffset = ThumbnailOffset;
1071 ImageInfo.ThumbnailSize = ThumbnailSize;
1072
1073 if (ShowTags){
1074 printf("Thumbnail size: %d bytes\n",ThumbnailSize);
1075 }
1076 }
1077 }
1078 printf("returning from ProcessExifDir");
1079 }
1080
1081
1082 //--------------------------------------------------------------------------
1083 // Process a EXIF marker
1084 // Describes all the drivel that most digital cameras include...
1085 //--------------------------------------------------------------------------
process_EXIF(unsigned char * ExifSection,unsigned int length)1086 void process_EXIF (unsigned char * ExifSection, unsigned int length)
1087 {
1088 int FirstOffset;
1089
1090 FocalplaneXRes = 0;
1091 FocalplaneUnits = 0;
1092 ExifImageWidth = 0;
1093 NumOrientations = 0;
1094
1095 if (ShowTags){
1096 printf("Exif header %d bytes long\n",length);
1097 }
1098
1099 { // Check the EXIF header component
1100 static uchar ExifHeader[] = "Exif\0\0";
1101 if (memcmp(ExifSection+2, ExifHeader,6)){
1102 ErrNonfatal("Incorrect Exif header",0,0);
1103 return;
1104 }
1105 }
1106
1107 if (memcmp(ExifSection+8,"II",2) == 0){
1108 if (ShowTags) printf("Exif section in Intel order\n");
1109 MotorolaOrder = 0;
1110 }else{
1111 if (memcmp(ExifSection+8,"MM",2) == 0){
1112 if (ShowTags) printf("Exif section in Motorola order\n");
1113 MotorolaOrder = 1;
1114 }else{
1115 ErrNonfatal("Invalid Exif alignment marker.",0,0);
1116 return;
1117 }
1118 }
1119
1120 // Check the next value for correctness.
1121 if (Get16u(ExifSection+10) != 0x2a){
1122 ErrNonfatal("Invalid Exif start (1)",0,0);
1123 return;
1124 }
1125
1126 FirstOffset = Get32u(ExifSection+12);
1127 if (FirstOffset < 8 || FirstOffset > 16){
1128 // Usually set to 8, but other values valid too.
1129 ErrNonfatal("Suspicious offset of first IFD value",0,0);
1130 return;
1131 }
1132
1133 DirWithThumbnailPtrs = NULL;
1134
1135
1136 // First directory starts 16 bytes in. All offset are relative to 8 bytes in.
1137 ProcessExifDir(ExifSection+8+FirstOffset, ExifSection+8, length-8, 0);
1138
1139 ImageInfo.ThumbnailAtEnd = ImageInfo.ThumbnailOffset >= ImageInfo.LargestExifOffset ? TRUE : FALSE;
1140 #ifdef SUPERDEBUG
1141 printf("Thumbnail %s end", (ImageInfo.ThumbnailAtEnd ? "at" : "NOT at"));
1142 #endif
1143 if (DumpExifMap){
1144 unsigned a,b;
1145 printf("Map: %05d- End of exif\n",length-8);
1146 // for (a=0;a<length-8;a+= 10){
1147 // printf("Map: %05d ",a);
1148 // for (b=0;b<10;b++) printf(" %02x",*(ExifSection+8+a+b));
1149 // printf("\n");
1150 // }
1151 for (a = 0; a < length - 8; ++a) {
1152 unsigned char c = *(ExifSection+8+a);
1153 unsigned pc = isprint(c) ? c : ' ';
1154 printf("Map: %4d %02x %c", a, c, pc);
1155 }
1156 }
1157
1158
1159 // Compute the CCD width, in millimeters.
1160 if (FocalplaneXRes != 0){
1161 // Note: With some cameras, its not possible to compute this correctly because
1162 // they don't adjust the indicated focal plane resolution units when using less
1163 // than maximum resolution, so the CCDWidth value comes out too small. Nothing
1164 // that Jhad can do about it - its a camera problem.
1165 ImageInfo.CCDWidth = (float)(ExifImageWidth * FocalplaneUnits / FocalplaneXRes);
1166
1167 if (ImageInfo.FocalLength.num != 0 && ImageInfo.FocalLength.denom != 0
1168 && ImageInfo.FocalLength35mmEquiv == 0){
1169 // Compute 35 mm equivalent focal length based on sensor geometry if we haven't
1170 // already got it explicitly from a tag.
1171 ImageInfo.FocalLength35mmEquiv = (int)(
1172 (double)ImageInfo.FocalLength.num / ImageInfo.FocalLength.denom
1173 / ImageInfo.CCDWidth * 36 + 0.5);
1174 }
1175 }
1176 }
1177
TagToTagTableEntry(unsigned short tag)1178 static const TagTable_t* TagToTagTableEntry(unsigned short tag)
1179 {
1180 unsigned int i;
1181 for (i = 0; i < TAG_TABLE_SIZE; i++) {
1182 if (TagTable[i].Tag == tag) {
1183 printf("found tag %d", tag);
1184 int format = TagTable[i].Format;
1185 if (format == 0) {
1186 printf("tag %s format not defined ***** YOU MUST ADD THE FORMAT TO THE TagTable in exif.c!!!!", TagTable[i].Desc);
1187 return NULL;
1188 }
1189 return &TagTable[i];
1190 }
1191 }
1192 printf("tag %d NOT FOUND", tag);
1193 return NULL;
1194 }
1195
writeExifTagAndData(int tag,int format,long components,long value,int valueInString,char * Buffer,int * DirIndex,int * DataWriteIndex)1196 static void writeExifTagAndData(int tag,
1197 int format,
1198 long components,
1199 long value,
1200 int valueInString,
1201 char* Buffer,
1202 int* DirIndex,
1203 int* DataWriteIndex) {
1204 void* componentsPosition = NULL; // for saving component position
1205
1206 Put16u(Buffer+ (*DirIndex), tag); // Tag
1207 Put16u(Buffer+(*DirIndex) + 2, format); // Format
1208 if (format == FMT_STRING && components == -1) {
1209 components = strlen((char*)value) + 1; // account for null terminator
1210 if (components & 1) ++components; // no odd lengths
1211 } else if (format == FMT_SSHORT && components == -1) {
1212 // jhead only supports reading one SSHORT anyway
1213 components = 1;
1214 }
1215 if (format == FMT_UNDEFINED && components == -1) {
1216 // check if this UNDEFINED format is actually ASCII (as it usually is)
1217 // if so, we can calculate the size
1218 if(memcmp((char*)value, ExifAsciiPrefix, sizeof(ExifAsciiPrefix)) == 0) {
1219 components = sizeof(ExifAsciiPrefix) +
1220 strlen((char*)value + sizeof(ExifAsciiPrefix)) + 1;
1221 if (components & 1) ++components; // no odd lengths
1222 }
1223 }
1224 Put32u(Buffer+(*DirIndex) + 4, components); // Components
1225 componentsPosition = Buffer+(*DirIndex) + 4; // components # can change for lists
1226 printf("# components: %ld", components);
1227 if (format == FMT_STRING) {
1228 // short strings can fit right in the long, otherwise have to
1229 // go in the data area
1230 if (components <= 4) {
1231 strcpy(Buffer+(*DirIndex) + 8, (char*)value);
1232 } else {
1233 Put32u(Buffer+(*DirIndex) + 8, (*DataWriteIndex)-8); // Pointer
1234 printf("copying value %s to %d", (char*)value, (*DataWriteIndex));
1235 strncpy(Buffer+(*DataWriteIndex), (char*)value, components);
1236 (*DataWriteIndex) += components;
1237 }
1238 } else if ((format == FMT_UNDEFINED) &&
1239 (memcmp((char*)value, ExifAsciiPrefix, sizeof(ExifAsciiPrefix)) == 0)) {
1240 // short strings can fit right in the long, otherwise have to
1241 // go in the data area
1242 if (components <= 4) {
1243 memcpy(Buffer+(*DirIndex) + 8, (char*)value, components);
1244 } else {
1245 Put32u(Buffer+(*DirIndex) + 8, (*DataWriteIndex)-8); // Pointer
1246 printf("copying %s to %d", (char*)value + sizeof(ExifAsciiPrefix), (*DataWriteIndex));
1247 memcpy(Buffer+(*DataWriteIndex), (char*)value, components);
1248 (*DataWriteIndex) += components;
1249 }
1250 } else if (!valueInString) {
1251 Put32u(Buffer+(*DirIndex) + 8, value); // Value
1252 } else {
1253 Put32u(Buffer+(*DirIndex) + 8, (*DataWriteIndex)-8); // Pointer
1254 // Usually the separator is ',', but sometimes ':' is used, like
1255 // TAG_GPS_TIMESTAMP.
1256 char* curElement = strtok((char*)value, ",:");
1257 int i;
1258
1259 // (components == -1) Need to handle lists with unknown length too
1260 for (i = 0; ((i < components) || (components == -1)) && curElement != NULL; i++) {
1261 #ifdef SUPERDEBUG
1262 printf("processing component %s format %s", curElement, formatStr(format));
1263 #endif
1264 // elements are separated by commas
1265 if (format == FMT_URATIONAL) {
1266 unsigned int numerator;
1267 unsigned int denominator;
1268 char* separator = strchr(curElement, '/');
1269 if (separator) {
1270 numerator = atoi(curElement);
1271 denominator = atoi(separator + 1);
1272 } else {
1273 double value = atof(curElement);
1274 ConvertDoubleToURational(value, &numerator, &denominator);
1275 }
1276 Put32u(Buffer+(*DataWriteIndex), numerator);
1277 Put32u(Buffer+(*DataWriteIndex) + 4, denominator);
1278 (*DataWriteIndex) += 8;
1279 } else if (format == FMT_SRATIONAL) {
1280 int numerator;
1281 int denominator;
1282 char* separator = strchr(curElement, '/');
1283 if (separator) {
1284 numerator = atoi(curElement);
1285 denominator = atoi(separator + 1);
1286 } else {
1287 double value = atof(curElement);
1288 ConvertDoubleToSRational(value, &numerator, &denominator);
1289 }
1290 Put32u(Buffer+(*DataWriteIndex), numerator);
1291 Put32u(Buffer+(*DataWriteIndex) + 4, denominator);
1292 (*DataWriteIndex) += 8;
1293 } else if ((components == -1) && ((format == FMT_USHORT) || (format == FMT_SSHORT))) {
1294 // variable components need to go into data write area
1295 value = atoi(curElement);
1296 Put16u(Buffer+(*DataWriteIndex), value);
1297 (*DataWriteIndex) += 4;
1298 } else {
1299 // TODO: doesn't handle multiple components yet -- if more than one, have to put in data write area.
1300 value = atoi(curElement);
1301 Put32u(Buffer+(*DirIndex) + 8, value); // Value
1302 }
1303 curElement = strtok(NULL, ",:");
1304 }
1305 if (components == -1) Put32u(componentsPosition, i); // update component # for unknowns
1306 }
1307 (*DirIndex) += 12;
1308 }
1309
1310 #ifdef SUPERDEBUG
formatStr(int format)1311 char* formatStr(int format) {
1312 switch (format) {
1313 case FMT_BYTE: return "FMT_BYTE"; break;
1314 case FMT_STRING: return "FMT_STRING"; break;
1315 case FMT_USHORT: return "FMT_USHORT"; break;
1316 case FMT_ULONG: return "FMT_ULONG"; break;
1317 case FMT_URATIONAL: return "FMT_URATIONAL"; break;
1318 case FMT_SBYTE: return "FMT_SBYTE"; break;
1319 case FMT_UNDEFINED: return "FMT_UNDEFINED"; break;
1320 case FMT_SSHORT: return "FMT_SSHORT"; break;
1321 case FMT_SLONG: return "FMT_SLONG"; break;
1322 case FMT_SRATIONAL: return "FMT_SRATIONAL"; break;
1323 case FMT_SINGLE: return "FMT_SINGLE"; break;
1324 case FMT_DOUBLE: return "FMT_SINGLE"; break;
1325 default: return "UNKNOWN";
1326 }
1327 }
1328 #endif
1329
1330 //--------------------------------------------------------------------------
1331 // Create minimal exif header - just date and thumbnail pointers,
1332 // so that date and thumbnail may be filled later.
1333 //--------------------------------------------------------------------------
create_EXIF_internal(ExifElement_t * elements,int exifTagCount,int gpsTagCount,int hasDateTimeTag,char * Buffer)1334 static void create_EXIF_internal(ExifElement_t* elements, int exifTagCount, int gpsTagCount, int hasDateTimeTag, char* Buffer)
1335 {
1336 unsigned short NumEntries;
1337 int DataWriteIndex;
1338 int DirIndex;
1339 int DirExifLink = 0;
1340
1341 #ifdef SUPERDEBUG
1342 ALOGE("create_EXIF %d exif elements, %d gps elements", exifTagCount, gpsTagCount);
1343 #endif
1344
1345 MotorolaOrder = 0;
1346
1347 memcpy(Buffer+2, "Exif\0\0II",8);
1348 Put16u(Buffer+10, 0x2a);
1349
1350 DataWriteIndex = 16;
1351 Put32u(Buffer+12, DataWriteIndex-8); // first IFD offset. Means start 16 bytes in.
1352
1353 {
1354 DirIndex = DataWriteIndex;
1355 NumEntries = 1 + exifTagCount; // the extra is the thumbnail
1356 if (gpsTagCount) {
1357 ++NumEntries; // allow for the GPS info tag
1358 }
1359 if (!hasDateTimeTag) {
1360 // We have to write extra date time tag. The entry number should be
1361 // adjusted.
1362 ++NumEntries;
1363 }
1364 DataWriteIndex += 2 + NumEntries*12 + 4;
1365
1366 Put16u(Buffer+DirIndex, NumEntries); // Number of entries
1367 DirIndex += 2;
1368
1369 // Entries go here...
1370 if (!hasDateTimeTag) {
1371 // Date/time entry
1372 char* dateTime = NULL;
1373 char dateBuf[20];
1374 if (ImageInfo.numDateTimeTags) {
1375 // If we had a pre-existing exif header, use time from that.
1376 dateTime = ImageInfo.DateTime;
1377 } else {
1378 // Oterwise, use the file's timestamp.
1379 FileTimeAsString(dateBuf);
1380 dateTime = dateBuf;
1381 }
1382 writeExifTagAndData(TAG_DATETIME,
1383 FMT_STRING,
1384 20,
1385 (long)(char*)dateBuf,
1386 FALSE,
1387 Buffer,
1388 &DirIndex,
1389 &DataWriteIndex);
1390
1391 }
1392 if (exifTagCount > 0) {
1393 int i;
1394 for (i = 0; i < exifTagCount + gpsTagCount; i++) {
1395 if (elements[i].GpsTag) {
1396 continue;
1397 }
1398 const TagTable_t* entry = TagToTagTableEntry(elements[i].Tag);
1399 if (entry == NULL) {
1400 continue;
1401 }
1402 #ifdef SUPERDEBUG
1403 ALOGE("create_EXIF saving tag %x value \"%s\"",elements[i].Tag, elements[i].Value);
1404 #endif
1405 writeExifTagAndData(elements[i].Tag,
1406 entry->Format,
1407 entry->DataLength,
1408 (long)elements[i].Value,
1409 TRUE,
1410 Buffer,
1411 &DirIndex,
1412 &DataWriteIndex);
1413 }
1414
1415 if (gpsTagCount) {
1416 // Link to gps dir entry
1417 writeExifTagAndData(TAG_GPSINFO,
1418 FMT_ULONG,
1419 1,
1420 DataWriteIndex-8,
1421 FALSE,
1422 Buffer,
1423 &DirIndex,
1424 &DataWriteIndex);
1425 }
1426
1427 // Link to exif dir entry
1428 int exifDirPtr = DataWriteIndex-8;
1429 if (gpsTagCount) {
1430 exifDirPtr += 2 + gpsTagCount*12 + 4;
1431 }
1432 DirExifLink = DirIndex;
1433 writeExifTagAndData(TAG_EXIF_OFFSET,
1434 FMT_ULONG,
1435 1,
1436 exifDirPtr,
1437 FALSE,
1438 Buffer,
1439 &DirIndex,
1440 &DataWriteIndex);
1441 }
1442
1443 // End of directory - contains optional link to continued directory.
1444 Put32u(Buffer+DirIndex, 0);
1445 printf("Ending Exif section DirIndex = %d DataWriteIndex %d", DirIndex, DataWriteIndex);
1446 }
1447
1448
1449 // GPS Section
1450 if (gpsTagCount) {
1451 DirIndex = DataWriteIndex;
1452 printf("Starting GPS section DirIndex = %d", DirIndex);
1453 NumEntries = gpsTagCount;
1454 DataWriteIndex += 2 + NumEntries*12 + 4;
1455
1456 Put16u(Buffer+DirIndex, NumEntries); // Number of entries
1457 DirIndex += 2;
1458 {
1459 int i;
1460 for (i = 0; i < exifTagCount + gpsTagCount; i++) {
1461 if (!elements[i].GpsTag) {
1462 continue;
1463 }
1464 const TagTable_t* entry = GpsTagToTagTableEntry(elements[i].Tag);
1465 if (entry == NULL) {
1466 continue;
1467 }
1468 #ifdef SUPERDEBUG
1469 ALOGE("create_EXIF saving GPS tag %x value \"%s\"",elements[i].Tag, elements[i].Value);
1470 #endif
1471 writeExifTagAndData(elements[i].Tag,
1472 entry->Format,
1473 entry->DataLength,
1474 (long)elements[i].Value,
1475 TRUE,
1476 Buffer,
1477 &DirIndex,
1478 &DataWriteIndex);
1479 }
1480 }
1481
1482 // End of directory - contains optional link to continued directory.
1483 Put32u(Buffer+DirIndex, 0);
1484 printf("Ending GPS section DirIndex = %d DataWriteIndex %d", DirIndex, DataWriteIndex);
1485 }
1486
1487 {
1488 // Overwriting TAG_EXIF_OFFSET which links to this directory
1489 Put32u(Buffer+DirExifLink+8, DataWriteIndex-8);
1490
1491 printf("Starting Thumbnail section DirIndex = %d", DirIndex);
1492 DirIndex = DataWriteIndex;
1493 NumEntries = 2;
1494 DataWriteIndex += 2 + NumEntries*12 + 4;
1495
1496 Put16u(Buffer+DirIndex, NumEntries); // Number of entries
1497 DirIndex += 2;
1498 {
1499 // Link to exif dir entry
1500 writeExifTagAndData(TAG_THUMBNAIL_OFFSET,
1501 FMT_ULONG,
1502 1,
1503 DataWriteIndex-8,
1504 FALSE,
1505 Buffer,
1506 &DirIndex,
1507 &DataWriteIndex);
1508 }
1509
1510 {
1511 // Link to exif dir entry
1512 writeExifTagAndData(TAG_THUMBNAIL_LENGTH,
1513 FMT_ULONG,
1514 1,
1515 0,
1516 FALSE,
1517 Buffer,
1518 &DirIndex,
1519 &DataWriteIndex);
1520 }
1521
1522 // End of directory - contains optional link to continued directory.
1523 Put32u(Buffer+DirIndex, 0);
1524 printf("Ending Thumbnail section DirIndex = %d DataWriteIndex %d", DirIndex, DataWriteIndex);
1525 }
1526
1527
1528 Buffer[0] = (unsigned char)(DataWriteIndex >> 8);
1529 Buffer[1] = (unsigned char)DataWriteIndex;
1530
1531 // Remove old exif section, if there was one.
1532 RemoveSectionType(M_EXIF);
1533
1534 {
1535 // Sections need malloced buffers, so do that now, especially because
1536 // we now know how big it needs to be allocated.
1537 unsigned char * NewBuf = malloc(DataWriteIndex);
1538 if (NewBuf == NULL){
1539 ErrFatal("Could not allocate memory");
1540 }
1541 memcpy(NewBuf, Buffer, DataWriteIndex);
1542
1543 CreateSection(M_EXIF, NewBuf, DataWriteIndex);
1544
1545 // Re-parse new exif section, now that its in place
1546 // otherwise, we risk touching data that has already been freed.
1547 process_EXIF(NewBuf, DataWriteIndex);
1548 }
1549 }
1550
create_EXIF(ExifElement_t * elements,int exifTagCount,int gpsTagCount,int hasDateTimeTag)1551 void create_EXIF(ExifElement_t* elements, int exifTagCount, int gpsTagCount, int hasDateTimeTag)
1552 {
1553 // It is hard to calculate exact necessary size for editing the exif
1554 // header dynamically, so we are using the maximum size of EXIF, 64K
1555 const int EXIF_MAX_SIZE = 1024*64;
1556 char* Buffer = malloc(EXIF_MAX_SIZE);
1557
1558 if (Buffer != NULL) {
1559 create_EXIF_internal(elements, exifTagCount, gpsTagCount, hasDateTimeTag, Buffer);
1560 free(Buffer);
1561 } else {
1562 ErrFatal("Could not allocate memory");
1563 }
1564 }
1565
1566 //--------------------------------------------------------------------------
1567 // Cler the rotation tag in the exif header to 1.
1568 //--------------------------------------------------------------------------
ClearOrientation(void)1569 const char * ClearOrientation(void)
1570 {
1571 int a;
1572 if (NumOrientations == 0) return NULL;
1573
1574 for (a=0;a<NumOrientations;a++){
1575 switch(OrientationNumFormat[a]){
1576 case FMT_SBYTE:
1577 case FMT_BYTE:
1578 *(uchar *)(OrientationPtr[a]) = 1;
1579 break;
1580
1581 case FMT_USHORT:
1582 Put16u(OrientationPtr[a], 1);
1583 break;
1584
1585 case FMT_ULONG:
1586 case FMT_SLONG:
1587 memset(OrientationPtr, 0, 4);
1588 // Can't be bothered to write generic Put32 if I only use it once.
1589 if (MotorolaOrder){
1590 ((uchar *)OrientationPtr[a])[3] = 1;
1591 }else{
1592 ((uchar *)OrientationPtr[a])[0] = 1;
1593 }
1594 break;
1595
1596 default:
1597 return NULL;
1598 }
1599 }
1600
1601 return OrientTab[ImageInfo.Orientation];
1602 }
1603
1604
1605
1606 //--------------------------------------------------------------------------
1607 // Remove thumbnail out of the exif image.
1608 //--------------------------------------------------------------------------
RemoveThumbnail(unsigned char * ExifSection)1609 int RemoveThumbnail(unsigned char * ExifSection)
1610 {
1611 if (!DirWithThumbnailPtrs ||
1612 ImageInfo.ThumbnailOffset == 0 ||
1613 ImageInfo.ThumbnailSize == 0){
1614 // No thumbnail, or already deleted it.
1615 return 0;
1616 }
1617 if (ImageInfo.ThumbnailAtEnd == FALSE){
1618 ErrNonfatal("Thumbnail is not at end of header, can't chop it off", 0, 0);
1619 return 0;
1620 }
1621
1622 {
1623 int de;
1624 int NumDirEntries;
1625 NumDirEntries = Get16u(DirWithThumbnailPtrs);
1626
1627 for (de=0;de<NumDirEntries;de++){
1628 int Tag;
1629 unsigned char * DirEntry;
1630 DirEntry = DIR_ENTRY_ADDR(DirWithThumbnailPtrs, de);
1631 Tag = Get16u(DirEntry);
1632 if (Tag == TAG_THUMBNAIL_LENGTH){
1633 // Set length to zero.
1634 if (Get16u(DirEntry+2) != FMT_ULONG){
1635 // non standard format encoding. Can't do it.
1636 ErrNonfatal("Can't remove thumbnail", 0, 0);
1637 return 0;
1638 }
1639 Put32u(DirEntry+8, 0);
1640 }
1641 }
1642 }
1643
1644 // This is how far the non thumbnail data went.
1645 return ImageInfo.ThumbnailOffset+8;
1646
1647 }
1648
1649
1650 //--------------------------------------------------------------------------
1651 // Convert exif time to Unix time structure
1652 //--------------------------------------------------------------------------
Exif2tm(struct tm * timeptr,char * ExifTime)1653 int Exif2tm(struct tm * timeptr, char * ExifTime)
1654 {
1655 int a;
1656
1657 timeptr->tm_wday = -1;
1658
1659 // Check for format: YYYY:MM:DD HH:MM:SS format.
1660 // Date and time normally separated by a space, but also seen a ':' there, so
1661 // skip the middle space with '%*c' so it can be any character.
1662 a = sscanf(ExifTime, "%d%*c%d%*c%d%*c%d:%d:%d",
1663 &timeptr->tm_year, &timeptr->tm_mon, &timeptr->tm_mday,
1664 &timeptr->tm_hour, &timeptr->tm_min, &timeptr->tm_sec);
1665
1666
1667 if (a == 6){
1668 timeptr->tm_isdst = -1;
1669 timeptr->tm_mon -= 1; // Adjust for unix zero-based months
1670 timeptr->tm_year -= 1900; // Adjust for year starting at 1900
1671 return TRUE; // worked.
1672 }
1673
1674 return FALSE; // Wasn't in Exif date format.
1675 }
1676
1677
1678 //--------------------------------------------------------------------------
1679 // Show the collected image info, displaying camera F-stop and shutter speed
1680 // in a consistent and legible fashion.
1681 //--------------------------------------------------------------------------
ShowImageInfo(int ShowFileInfo)1682 void ShowImageInfo(int ShowFileInfo)
1683 {
1684 if (ShowFileInfo){
1685 printf("File name : %s\n",ImageInfo.FileName);
1686 printf("File size : %d bytes\n",ImageInfo.FileSize);
1687
1688 {
1689 char Temp[20];
1690 FileTimeAsString(Temp);
1691 printf("File date : %s\n",Temp);
1692 }
1693 }
1694
1695 if (ImageInfo.CameraMake[0]){
1696 printf("Camera make : %s\n",ImageInfo.CameraMake);
1697 printf("Camera model : %s\n",ImageInfo.CameraModel);
1698 }
1699 if (ImageInfo.DateTime[0]){
1700 printf("Date/Time : %s\n",ImageInfo.DateTime);
1701 }
1702 printf("Resolution : %d x %d\n",ImageInfo.Width, ImageInfo.Height);
1703
1704 if (ImageInfo.Orientation > 1){
1705 // Only print orientation if one was supplied, and if its not 1 (normal orientation)
1706 printf("Orientation : %s\n", OrientTab[ImageInfo.Orientation]);
1707 }
1708
1709 if (ImageInfo.IsColor == 0){
1710 printf("Color/bw : Black and white\n");
1711 }
1712
1713 if (ImageInfo.FlashUsed >= 0){
1714 if (ImageInfo.FlashUsed & 1){
1715 printf("Flash used : Yes");
1716 switch (ImageInfo.FlashUsed){
1717 case 0x5: printf(" (Strobe light not detected)"); break;
1718 case 0x7: printf(" (Strobe light detected) "); break;
1719 case 0x9: printf(" (manual)"); break;
1720 case 0xd: printf(" (manual, return light not detected)"); break;
1721 case 0xf: printf(" (manual, return light detected)"); break;
1722 case 0x19:printf(" (auto)"); break;
1723 case 0x1d:printf(" (auto, return light not detected)"); break;
1724 case 0x1f:printf(" (auto, return light detected)"); break;
1725 case 0x41:printf(" (red eye reduction mode)"); break;
1726 case 0x45:printf(" (red eye reduction mode return light not detected)"); break;
1727 case 0x47:printf(" (red eye reduction mode return light detected)"); break;
1728 case 0x49:printf(" (manual, red eye reduction mode)"); break;
1729 case 0x4d:printf(" (manual, red eye reduction mode, return light not detected)"); break;
1730 case 0x4f:printf(" (red eye reduction mode, return light detected)"); break;
1731 case 0x59:printf(" (auto, red eye reduction mode)"); break;
1732 case 0x5d:printf(" (auto, red eye reduction mode, return light not detected)"); break;
1733 case 0x5f:printf(" (auto, red eye reduction mode, return light detected)"); break;
1734 }
1735 }else{
1736 printf("Flash used : No");
1737 switch (ImageInfo.FlashUsed){
1738 case 0x18:printf(" (auto)"); break;
1739 }
1740 }
1741 printf("\n");
1742 }
1743
1744
1745 if (ImageInfo.FocalLength.num != 0 && ImageInfo.FocalLength.denom != 0) {
1746 printf("Focal length : %4.1fmm",(double)ImageInfo.FocalLength.num / ImageInfo.FocalLength.denom);
1747 if (ImageInfo.FocalLength35mmEquiv){
1748 printf(" (35mm equivalent: %dmm)", ImageInfo.FocalLength35mmEquiv);
1749 }
1750 printf("\n");
1751 }
1752
1753 if (ImageInfo.DigitalZoomRatio > 1){
1754 // Digital zoom used. Shame on you!
1755 printf("Digital Zoom : %1.3fx\n", (double)ImageInfo.DigitalZoomRatio);
1756 }
1757
1758 if (ImageInfo.CCDWidth){
1759 printf("CCD width : %4.2fmm\n",(double)ImageInfo.CCDWidth);
1760 }
1761
1762 if (ImageInfo.ExposureTime){
1763 if (ImageInfo.ExposureTime < 0.010){
1764 printf("Exposure time: %6.4f s ",(double)ImageInfo.ExposureTime);
1765 }else{
1766 printf("Exposure time: %5.3f s ",(double)ImageInfo.ExposureTime);
1767 }
1768 if (ImageInfo.ExposureTime <= 0.5){
1769 printf(" (1/%d)",(int)(0.5 + 1/ImageInfo.ExposureTime));
1770 }
1771 printf("\n");
1772 }
1773 if (ImageInfo.ApertureFNumber){
1774 printf("Aperture : f/%3.1f\n",(double)ImageInfo.ApertureFNumber);
1775 }
1776 if (ImageInfo.Distance){
1777 if (ImageInfo.Distance < 0){
1778 printf("Focus dist. : Infinite\n");
1779 }else{
1780 printf("Focus dist. : %4.2fm\n",(double)ImageInfo.Distance);
1781 }
1782 }
1783
1784 if (ImageInfo.ISOequivalent){
1785 printf("ISO equiv. : %2d\n",(int)ImageInfo.ISOequivalent);
1786 }
1787
1788 if (ImageInfo.ExposureBias){
1789 // If exposure bias was specified, but set to zero, presumably its no bias at all,
1790 // so only show it if its nonzero.
1791 printf("Exposure bias: %4.2f\n",(double)ImageInfo.ExposureBias);
1792 }
1793
1794 switch(ImageInfo.Whitebalance) {
1795 case 1:
1796 printf("Whitebalance : Manual\n");
1797 break;
1798 case 0:
1799 printf("Whitebalance : Auto\n");
1800 break;
1801 }
1802
1803 //Quercus: 17-1-2004 Added LightSource, some cams return this, whitebalance or both
1804 switch(ImageInfo.LightSource) {
1805 case 1:
1806 printf("Light Source : Daylight\n");
1807 break;
1808 case 2:
1809 printf("Light Source : Fluorescent\n");
1810 break;
1811 case 3:
1812 printf("Light Source : Incandescent\n");
1813 break;
1814 case 4:
1815 printf("Light Source : Flash\n");
1816 break;
1817 case 9:
1818 printf("Light Source : Fine weather\n");
1819 break;
1820 case 11:
1821 printf("Light Source : Shade\n");
1822 break;
1823 default:; //Quercus: 17-1-2004 There are many more modes for this, check Exif2.2 specs
1824 // If it just says 'unknown' or we don't know it, then
1825 // don't bother showing it - it doesn't add any useful information.
1826 }
1827
1828 if (ImageInfo.MeteringMode){ // 05-jan-2001 vcs
1829 switch(ImageInfo.MeteringMode) {
1830 case 2:
1831 printf("Metering Mode: center weight\n");
1832 break;
1833 case 3:
1834 printf("Metering Mode: spot\n");
1835 break;
1836 case 5:
1837 printf("Metering Mode: matrix\n");
1838 break;
1839 }
1840 }
1841
1842 if (ImageInfo.ExposureProgram){ // 05-jan-2001 vcs
1843 switch(ImageInfo.ExposureProgram) {
1844 case 1:
1845 printf("Exposure : Manual\n");
1846 break;
1847 case 2:
1848 printf("Exposure : program (auto)\n");
1849 break;
1850 case 3:
1851 printf("Exposure : aperture priority (semi-auto)\n");
1852 break;
1853 case 4:
1854 printf("Exposure : shutter priority (semi-auto)\n");
1855 break;
1856 case 5:
1857 printf("Exposure : Creative Program (based towards depth of field)\n");
1858 break;
1859 case 6:
1860 printf("Exposure : Action program (based towards fast shutter speed)\n");
1861 break;
1862 case 7:
1863 printf("Exposure : Portrait Mode\n");
1864 break;
1865 case 8:
1866 printf("Exposure : LandscapeMode \n");
1867 break;
1868 default:
1869 break;
1870 }
1871 }
1872 switch(ImageInfo.ExposureMode){
1873 case 0: // Automatic (not worth cluttering up output for)
1874 break;
1875 case 1: printf("Exposure Mode: Manual\n");
1876 break;
1877 case 2: printf("Exposure Mode: Auto bracketing\n");
1878 break;
1879 }
1880
1881 if (ImageInfo.DistanceRange) {
1882 printf("Focus range : ");
1883 switch(ImageInfo.DistanceRange) {
1884 case 1:
1885 printf("macro");
1886 break;
1887 case 2:
1888 printf("close");
1889 break;
1890 case 3:
1891 printf("distant");
1892 break;
1893 }
1894 printf("\n");
1895 }
1896
1897
1898
1899 if (ImageInfo.Process != M_SOF0){
1900 // don't show it if its the plain old boring 'baseline' process, but do
1901 // show it if its something else, like 'progressive' (used on web sometimes)
1902 int a;
1903 for (a=0;;a++){
1904 if (a >= (int)PROCESS_TABLE_SIZE){
1905 // ran off the end of the table.
1906 printf("Jpeg process : Unknown\n");
1907 break;
1908 }
1909 if (ProcessTable[a].Tag == ImageInfo.Process){
1910 printf("Jpeg process : %s\n",ProcessTable[a].Desc);
1911 break;
1912 }
1913 }
1914 }
1915
1916 if (ImageInfo.GpsInfoPresent){
1917 printf("GPS Latitude : %s\n",ImageInfo.GpsLat);
1918 printf("GPS Longitude: %s\n",ImageInfo.GpsLong);
1919 if (ImageInfo.GpsAlt[0]) printf("GPS Altitude : %s\n",ImageInfo.GpsAlt);
1920 }
1921
1922 // Print the comment. Print 'Comment:' for each new line of comment.
1923 if (ImageInfo.Comments[0]){
1924 int a,c;
1925 printf("Comment : ");
1926 if (!ImageInfo.CommentWidchars){
1927 for (a=0;a<MAX_COMMENT_SIZE;a++){
1928 c = ImageInfo.Comments[a];
1929 if (c == '\0') break;
1930 if (c == '\n'){
1931 // Do not start a new line if the string ends with a carriage return.
1932 if (ImageInfo.Comments[a+1] != '\0'){
1933 printf("\nComment : ");
1934 }else{
1935 printf("\n");
1936 }
1937 }else{
1938 putchar(c);
1939 }
1940 }
1941 printf("\n");
1942 }else{
1943 printf("%.*ls\n", ImageInfo.CommentWidchars, (wchar_t *)ImageInfo.Comments);
1944 }
1945 }
1946 if (ImageInfo.ThumbnailOffset){
1947 printf("Map: %05d-%05d: Thumbnail\n",ImageInfo.ThumbnailOffset, ImageInfo.ThumbnailOffset+ImageInfo.ThumbnailSize);
1948 } else {
1949 printf("NO thumbnail");
1950 }
1951 }
1952
1953
1954 //--------------------------------------------------------------------------
1955 // Summarize highlights of image info on one line (suitable for grep-ing)
1956 //--------------------------------------------------------------------------
ShowConciseImageInfo(void)1957 void ShowConciseImageInfo(void)
1958 {
1959 printf("\"%s\"",ImageInfo.FileName);
1960
1961 printf(" %dx%d",ImageInfo.Width, ImageInfo.Height);
1962
1963 if (ImageInfo.ExposureTime){
1964 if (ImageInfo.ExposureTime <= 0.5){
1965 printf(" (1/%d)",(int)(0.5 + 1/ImageInfo.ExposureTime));
1966 }else{
1967 printf(" (%1.1f)",ImageInfo.ExposureTime);
1968 }
1969 }
1970
1971 if (ImageInfo.ApertureFNumber){
1972 printf(" f/%3.1f",(double)ImageInfo.ApertureFNumber);
1973 }
1974
1975 if (ImageInfo.FocalLength35mmEquiv){
1976 printf(" f(35)=%dmm",ImageInfo.FocalLength35mmEquiv);
1977 }
1978
1979 if (ImageInfo.FlashUsed >= 0 && ImageInfo.FlashUsed & 1){
1980 printf(" (flash)");
1981 }
1982
1983 if (ImageInfo.IsColor == 0){
1984 printf(" (bw)");
1985 }
1986
1987 printf("\n");
1988 }
1989