1 /* exif-entry.c
2 *
3 * Copyright (c) 2001 Lutz Mueller <lutz@users.sourceforge.net>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301 USA.
19 */
20
21 #include <config.h>
22
23 #include <libexif/exif-entry.h>
24 #include <libexif/exif-ifd.h>
25 #include <libexif/exif-utils.h>
26 #include <libexif/i18n.h>
27
28 #include <libexif/exif-gps-ifd.h>
29
30 #include <ctype.h>
31 #include <stdlib.h>
32 #include <stdio.h>
33 #include <string.h>
34 #include <time.h>
35 #include <math.h>
36
37 #ifndef M_PI
38 #define M_PI 3.14159265358979323846
39 #endif
40
41 struct _ExifEntryPrivate
42 {
43 unsigned int ref_count;
44
45 ExifMem *mem;
46 };
47
48 /* This function is hidden in exif-data.c */
49 ExifLog *exif_data_get_log (ExifData *);
50
51 #ifndef NO_VERBOSE_TAG_STRINGS
52 static void
exif_entry_log(ExifEntry * e,ExifLogCode code,const char * format,...)53 exif_entry_log (ExifEntry *e, ExifLogCode code, const char *format, ...)
54 {
55 va_list args;
56 ExifLog *l = NULL;
57
58 if (e && e->parent && e->parent->parent)
59 l = exif_data_get_log (e->parent->parent);
60 va_start (args, format);
61 exif_logv (l, code, "ExifEntry", format, args);
62 va_end (args);
63 }
64 #else
65 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
66 #define exif_entry_log(...) do { } while (0)
67 #elif defined(__GNUC__)
68 #define exif_entry_log(x...) do { } while (0)
69 #else
70 #define exif_entry_log (void)
71 #endif
72 #endif
73
74 static void *
exif_entry_alloc(ExifEntry * e,unsigned int i)75 exif_entry_alloc (ExifEntry *e, unsigned int i)
76 {
77 void *d;
78 ExifLog *l = NULL;
79
80 if (!e || !e->priv || !i) return NULL;
81
82 d = exif_mem_alloc (e->priv->mem, i);
83 if (d) return d;
84
85 if (e->parent && e->parent->parent)
86 l = exif_data_get_log (e->parent->parent);
87 EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
88 return NULL;
89 }
90
91 static void *
exif_entry_realloc(ExifEntry * e,void * d_orig,unsigned int i)92 exif_entry_realloc (ExifEntry *e, void *d_orig, unsigned int i)
93 {
94 void *d;
95 ExifLog *l = NULL;
96
97 if (!e || !e->priv) return NULL;
98
99 if (!i) { exif_mem_free (e->priv->mem, d_orig); return NULL; }
100
101 d = exif_mem_realloc (e->priv->mem, d_orig, i);
102 if (d) return d;
103
104 if (e->parent && e->parent->parent)
105 l = exif_data_get_log (e->parent->parent);
106 EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
107 return NULL;
108 }
109
110 ExifEntry *
exif_entry_new(void)111 exif_entry_new (void)
112 {
113 ExifMem *mem = exif_mem_new_default ();
114 ExifEntry *e = exif_entry_new_mem (mem);
115
116 exif_mem_unref (mem);
117
118 return e;
119 }
120
121 ExifEntry *
exif_entry_new_mem(ExifMem * mem)122 exif_entry_new_mem (ExifMem *mem)
123 {
124 ExifEntry *e = NULL;
125
126 e = exif_mem_alloc (mem, sizeof (ExifEntry));
127 if (!e) return NULL;
128 e->priv = exif_mem_alloc (mem, sizeof (ExifEntryPrivate));
129 if (!e->priv) { exif_mem_free (mem, e); return NULL; }
130 e->priv->ref_count = 1;
131
132 e->priv->mem = mem;
133 exif_mem_ref (mem);
134
135 return e;
136 }
137
138 void
exif_entry_ref(ExifEntry * e)139 exif_entry_ref (ExifEntry *e)
140 {
141 if (!e) return;
142
143 e->priv->ref_count++;
144 }
145
146 void
exif_entry_unref(ExifEntry * e)147 exif_entry_unref (ExifEntry *e)
148 {
149 if (!e || !e->priv) return;
150
151 e->priv->ref_count--;
152 if (!e->priv->ref_count)
153 exif_entry_free (e);
154 }
155
156 void
exif_entry_free(ExifEntry * e)157 exif_entry_free (ExifEntry *e)
158 {
159 if (!e) return;
160
161 if (e->priv) {
162 ExifMem *mem = e->priv->mem;
163 if (e->data)
164 exif_mem_free (mem, e->data);
165 exif_mem_free (mem, e->priv);
166 exif_mem_free (mem, e);
167 exif_mem_unref (mem);
168 }
169 }
170
171 static void
clear_entry(ExifEntry * e)172 clear_entry (ExifEntry *e)
173 {
174 e->components = 0;
175 e->size = 0;
176 }
177
178 static int
count_decimal(double num)179 count_decimal(double num)
180 {
181 char str[50];
182 sprintf(str, "%.10f", num);
183 int len = strlen(str);
184 int decimalPlaces = 0;
185 // Start counting from the decimal point
186 int i = len - 1;
187 while (str[i] != '.') {
188 if (str[i] != '0') { // Skip trailing zeros
189 break;
190 }
191 i--;
192 }
193 // Count actual decimal places
194 while (str[i] != '.' && i >= 0) {
195 decimalPlaces++;
196 i--;
197 }
198 return decimalPlaces;
199 }
200
201 static uint32_t
gcd_uint32_t(uint32_t a,uint32_t b)202 gcd_uint32_t(uint32_t a, uint32_t b)
203 {
204 if (b == 0) {
205 return a;
206 }
207 return gcd_uint32_t(b, a % b);
208 }
209
210 /*! Get a value and convert it to an ExifShort.
211 * \bug Not all types are converted that could be converted and no indication
212 * is made when that occurs
213 */
214 static inline ExifShort
exif_get_short_convert(const unsigned char * buf,ExifFormat format,ExifByteOrder order)215 exif_get_short_convert (const unsigned char *buf, ExifFormat format,
216 ExifByteOrder order)
217 {
218 switch (format) {
219 case EXIF_FORMAT_LONG:
220 return (ExifShort) exif_get_long (buf, order);
221 case EXIF_FORMAT_SLONG:
222 return (ExifShort) exif_get_slong (buf, order);
223 case EXIF_FORMAT_SHORT:
224 return (ExifShort) exif_get_short (buf, order);
225 case EXIF_FORMAT_SSHORT:
226 return (ExifShort) exif_get_sshort (buf, order);
227 case EXIF_FORMAT_BYTE:
228 case EXIF_FORMAT_SBYTE:
229 return (ExifShort) buf[0];
230 default:
231 /* Unsupported type */
232 return (ExifShort) 0;
233 }
234 }
235
236 void
exif_entry_fix(ExifEntry * e)237 exif_entry_fix (ExifEntry *e)
238 {
239 unsigned int i, newsize;
240 unsigned char *newdata;
241 ExifByteOrder o;
242 ExifRational r;
243 ExifSRational sr;
244
245 if (!e || !e->priv) return;
246
247 switch (e->tag) {
248
249 /* These tags all need to be of format SHORT. */
250 case EXIF_TAG_YCBCR_SUB_SAMPLING:
251 case EXIF_TAG_SUBJECT_AREA:
252 case EXIF_TAG_COLOR_SPACE:
253 case EXIF_TAG_PLANAR_CONFIGURATION:
254 case EXIF_TAG_SENSING_METHOD:
255 case EXIF_TAG_ORIENTATION:
256 case EXIF_TAG_YCBCR_POSITIONING:
257 case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
258 case EXIF_TAG_CUSTOM_RENDERED:
259 case EXIF_TAG_EXPOSURE_MODE:
260 case EXIF_TAG_WHITE_BALANCE:
261 case EXIF_TAG_SCENE_CAPTURE_TYPE:
262 case EXIF_TAG_GAIN_CONTROL:
263 case EXIF_TAG_SATURATION:
264 case EXIF_TAG_CONTRAST:
265 case EXIF_TAG_SHARPNESS:
266 case EXIF_TAG_ISO_SPEED_RATINGS:
267 switch (e->format) {
268 case EXIF_FORMAT_LONG:
269 case EXIF_FORMAT_SLONG:
270 case EXIF_FORMAT_BYTE:
271 case EXIF_FORMAT_SBYTE:
272 case EXIF_FORMAT_SSHORT:
273 if (!e->parent || !e->parent->parent) break;
274 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
275 _("Tag '%s' was of format '%s' (which is "
276 "against specification) and has been "
277 "changed to format '%s'."),
278 exif_tag_get_name_in_ifd(e->tag,
279 exif_entry_get_ifd(e)),
280 exif_format_get_name (e->format),
281 exif_format_get_name (EXIF_FORMAT_SHORT));
282
283 o = exif_data_get_byte_order (e->parent->parent);
284 newsize = e->components * exif_format_get_size (EXIF_FORMAT_SHORT);
285 newdata = exif_entry_alloc (e, newsize);
286 if (!newdata) {
287 exif_entry_log (e, EXIF_LOG_CODE_NO_MEMORY,
288 "Could not allocate %lu byte(s).", (unsigned long)newsize);
289 break;
290 }
291
292 for (i = 0; i < e->components; i++)
293 exif_set_short (
294 newdata + i *
295 exif_format_get_size (
296 EXIF_FORMAT_SHORT), o,
297 exif_get_short_convert (
298 e->data + i *
299 exif_format_get_size (e->format),
300 e->format, o));
301
302 exif_mem_free (e->priv->mem, e->data);
303 e->data = newdata;
304 e->size = newsize;
305 e->format = EXIF_FORMAT_SHORT;
306 break;
307 case EXIF_FORMAT_SHORT:
308 /* No conversion necessary */
309 break;
310 default:
311 exif_entry_log (e, EXIF_LOG_CODE_CORRUPT_DATA,
312 _("Tag '%s' is of format '%s' (which is "
313 "against specification) but cannot be changed "
314 "to format '%s'."),
315 exif_tag_get_name_in_ifd(e->tag,
316 exif_entry_get_ifd(e)),
317 exif_format_get_name (e->format),
318 exif_format_get_name (EXIF_FORMAT_SHORT));
319 break;
320 }
321 break;
322
323 /* All these tags need to be of format 'Rational'. */
324 case EXIF_TAG_FNUMBER:
325 case EXIF_TAG_APERTURE_VALUE:
326 case EXIF_TAG_EXPOSURE_TIME:
327 case EXIF_TAG_FOCAL_LENGTH:
328 switch (e->format) {
329 case EXIF_FORMAT_SRATIONAL:
330 if (!e->parent || !e->parent->parent) break;
331 o = exif_data_get_byte_order (e->parent->parent);
332 for (i = 0; i < e->components; i++) {
333 sr = exif_get_srational (e->data + i *
334 exif_format_get_size (
335 EXIF_FORMAT_SRATIONAL), o);
336 r.numerator = (ExifLong) sr.numerator;
337 r.denominator = (ExifLong) sr.denominator;
338 exif_set_rational (e->data + i *
339 exif_format_get_size (
340 EXIF_FORMAT_RATIONAL), o, r);
341 }
342 e->format = EXIF_FORMAT_RATIONAL;
343 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
344 _("Tag '%s' was of format '%s' (which is "
345 "against specification) and has been "
346 "changed to format '%s'."),
347 exif_tag_get_name_in_ifd(e->tag,
348 exif_entry_get_ifd(e)),
349 exif_format_get_name (EXIF_FORMAT_SRATIONAL),
350 exif_format_get_name (EXIF_FORMAT_RATIONAL));
351 break;
352 default:
353 break;
354 }
355 break;
356
357 /* All these tags need to be of format 'SRational'. */
358 case EXIF_TAG_EXPOSURE_BIAS_VALUE:
359 case EXIF_TAG_BRIGHTNESS_VALUE:
360 case EXIF_TAG_SHUTTER_SPEED_VALUE:
361 switch (e->format) {
362 case EXIF_FORMAT_RATIONAL:
363 if (!e->parent || !e->parent->parent) break;
364 o = exif_data_get_byte_order (e->parent->parent);
365 for (i = 0; i < e->components; i++) {
366 r = exif_get_rational (e->data + i *
367 exif_format_get_size (
368 EXIF_FORMAT_RATIONAL), o);
369 sr.numerator = (ExifLong) r.numerator;
370 sr.denominator = (ExifLong) r.denominator;
371 exif_set_srational (e->data + i *
372 exif_format_get_size (
373 EXIF_FORMAT_SRATIONAL), o, sr);
374 }
375 e->format = EXIF_FORMAT_SRATIONAL;
376 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
377 _("Tag '%s' was of format '%s' (which is "
378 "against specification) and has been "
379 "changed to format '%s'."),
380 exif_tag_get_name_in_ifd(e->tag,
381 exif_entry_get_ifd(e)),
382 exif_format_get_name (EXIF_FORMAT_RATIONAL),
383 exif_format_get_name (EXIF_FORMAT_SRATIONAL));
384 break;
385 default:
386 break;
387 }
388 break;
389
390 case EXIF_TAG_USER_COMMENT:
391 /* Format needs to be UNDEFINED. */
392 if (e->format != EXIF_FORMAT_UNDEFINED) {
393 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
394 _("Tag 'UserComment' had invalid format '%s'. "
395 "Format has been set to 'undefined'."),
396 exif_format_get_name (e->format));
397 e->format = EXIF_FORMAT_UNDEFINED;
398 }
399
400 /* Some packages like Canon ZoomBrowser EX 4.5 store
401 only one zero byte followed by 7 bytes of rubbish */
402 if ((e->size >= 8) && (e->data[0] == 0)) {
403 memcpy(e->data, "\0\0\0\0\0\0\0\0", 8);
404 }
405
406 /* There need to be at least 8 bytes. */
407 if (e->size < 8) {
408 e->data = exif_entry_realloc (e, e->data, 8 + e->size);
409 if (!e->data) {
410 clear_entry(e);
411 return;
412 }
413
414 /* Assume ASCII */
415 memmove (e->data + 8, e->data, e->size);
416 memcpy (e->data, "ASCII\0\0\0", 8);
417 e->size += 8;
418 e->components += 8;
419 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
420 _("Tag 'UserComment' has been expanded to at "
421 "least 8 bytes in order to follow the "
422 "specification."));
423 break;
424 }
425
426 /*
427 * If the first 8 bytes are empty and real data starts
428 * afterwards, let's assume ASCII and claim the 8 first
429 * bytes for the format specifyer.
430 */
431 for (i = 0; (i < e->size) && !e->data[i]; i++);
432 if (!i) for ( ; (i < e->size) && (e->data[i] == ' '); i++);
433 if ((i >= 8) && (i < e->size)) {
434 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
435 _("Tag 'UserComment' is not empty but does not "
436 "start with a format identifier. "
437 "This has been fixed."));
438 memcpy (e->data, "ASCII\0\0\0", 8);
439 break;
440 }
441
442 /*
443 * First 8 bytes need to follow the specification. If they don't,
444 * assume ASCII.
445 */
446 if (memcmp (e->data, "ASCII\0\0\0" , 8) &&
447 memcmp (e->data, "UNICODE\0" , 8) &&
448 memcmp (e->data, "JIS\0\0\0\0\0" , 8) &&
449 memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)) {
450 e->data = exif_entry_realloc (e, e->data, 8 + e->size);
451 if (!e->data) {
452 clear_entry(e);
453 break;
454 }
455
456 /* Assume ASCII */
457 memmove (e->data + 8, e->data, e->size);
458 memcpy (e->data, "ASCII\0\0\0", 8);
459 e->size += 8;
460 e->components += 8;
461 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
462 _("Tag 'UserComment' did not start with a "
463 "format identifier. This has been fixed."));
464 break;
465 }
466
467 break;
468 default:
469 break;
470 }
471 }
472
473 /*! Format the value of an ExifEntry for human display in a generic way.
474 * The output is localized. The formatting is independent of the tag number
475 * and is based entirely on the data type.
476 * \pre The ExifEntry is already a member of an ExifData.
477 * \param[in] e EXIF entry
478 * \param[out] val buffer in which to store value
479 * \param[in] maxlen the length of the buffer val
480 */
481 static void
exif_entry_format_value(ExifEntry * e,char * val,size_t maxlen)482 exif_entry_format_value(ExifEntry *e, char *val, size_t maxlen)
483 {
484 ExifByte v_byte;
485 ExifShort v_short;
486 ExifSShort v_sshort;
487 ExifLong v_long;
488 ExifRational v_rat;
489 ExifSRational v_srat;
490 ExifSLong v_slong;
491 unsigned int i;
492 size_t len;
493 const ExifByteOrder o = exif_data_get_byte_order (e->parent->parent);
494
495 if (!e->size || !maxlen)
496 return;
497 switch (e->format) {
498 case EXIF_FORMAT_UNDEFINED:
499 snprintf (val, maxlen, _("%i bytes undefined data"), e->size);
500 break;
501 case EXIF_FORMAT_BYTE:
502 case EXIF_FORMAT_SBYTE:
503 v_byte = e->data[0];
504 snprintf (val, maxlen, "0x%02x", v_byte);
505 len = strlen (val);
506 for (i = 1; i < e->components; i++) {
507 v_byte = e->data[i];
508 snprintf (val+len, maxlen-len, ", 0x%02x", v_byte);
509 len += strlen (val+len);
510 if (len >= maxlen-1) break;
511 }
512 break;
513 case EXIF_FORMAT_SHORT:
514 v_short = exif_get_short (e->data, o);
515 snprintf (val, maxlen, "%u", v_short);
516 len = strlen (val);
517 for (i = 1; i < e->components; i++) {
518 v_short = exif_get_short (e->data +
519 exif_format_get_size (e->format) * i, o);
520 snprintf (val+len, maxlen-len, ", %u", v_short);
521 len += strlen (val+len);
522 if (len >= maxlen-1) break;
523 }
524 break;
525 case EXIF_FORMAT_SSHORT:
526 v_sshort = exif_get_sshort (e->data, o);
527 snprintf (val, maxlen, "%i", v_sshort);
528 len = strlen (val);
529 for (i = 1; i < e->components; i++) {
530 v_sshort = exif_get_short (e->data +
531 exif_format_get_size (e->format) *
532 i, o);
533 snprintf (val+len, maxlen-len, ", %i", v_sshort);
534 len += strlen (val+len);
535 if (len >= maxlen-1) break;
536 }
537 break;
538 case EXIF_FORMAT_LONG:
539 v_long = exif_get_long (e->data, o);
540 snprintf (val, maxlen, "%lu", (unsigned long) v_long);
541 len = strlen (val);
542 for (i = 1; i < e->components; i++) {
543 v_long = exif_get_long (e->data +
544 exif_format_get_size (e->format) *
545 i, o);
546 snprintf (val+len, maxlen-len, ", %lu", (unsigned long) v_long);
547 len += strlen (val+len);
548 if (len >= maxlen-1) break;
549 }
550 break;
551 case EXIF_FORMAT_SLONG:
552 v_slong = exif_get_slong (e->data, o);
553 snprintf (val, maxlen, "%li", (long) v_slong);
554 len = strlen (val);
555 for (i = 1; i < e->components; i++) {
556 v_slong = exif_get_slong (e->data +
557 exif_format_get_size (e->format) * i, o);
558 snprintf (val+len, maxlen-len, ", %li", (long) v_slong);
559 len += strlen (val+len);
560 if (len >= maxlen-1) break;
561 }
562 break;
563 case EXIF_FORMAT_ASCII:
564 strncpy (val, (char *) e->data, MIN (maxlen-1, e->size));
565 val[MIN (maxlen-1, e->size)] = 0;
566 break;
567 case EXIF_FORMAT_RATIONAL:
568 len = 0;
569 for (i = 0; i < e->components; i++) {
570 if (i > 0) {
571 snprintf (val+len, maxlen-len, ", ");
572 len += strlen (val+len);
573 }
574 v_rat = exif_get_rational (
575 e->data + 8 * i, o);
576 if (v_rat.denominator) {
577 /*
578 * Choose the number of significant digits to
579 * display based on the size of the denominator.
580 * It is scaled so that denominators within the
581 * range 13..120 will show 2 decimal points.
582 */
583 int decimals = (int)(log10(v_rat.denominator)-0.08+1.0);
584 snprintf (val+len, maxlen-len, "%2.*f",
585 decimals,
586 (double) v_rat.numerator /
587 (double) v_rat.denominator);
588 } else
589 snprintf (val+len, maxlen-len, "%lu/%lu",
590 (unsigned long) v_rat.numerator,
591 (unsigned long) v_rat.denominator);
592 len += strlen (val+len);
593 if (len >= maxlen-1) break;
594 }
595 break;
596 case EXIF_FORMAT_SRATIONAL:
597 len = 0;
598 for (i = 0; i < e->components; i++) {
599 if (i > 0) {
600 snprintf (val+len, maxlen-len, ", ");
601 len += strlen (val+len);
602 }
603 v_srat = exif_get_srational (
604 e->data + 8 * i, o);
605 if (v_srat.denominator) {
606 int decimals = (int)(log10(abs(v_srat.denominator))-0.08+1.0);
607 snprintf (val+len, maxlen-len, "%2.*f",
608 decimals,
609 (double) v_srat.numerator /
610 (double) v_srat.denominator);
611 } else
612 snprintf (val+len, maxlen-len, "%li/%li",
613 (long) v_srat.numerator,
614 (long) v_srat.denominator);
615 len += strlen (val+len);
616 if (len >= maxlen-1) break;
617 }
618 break;
619 case EXIF_FORMAT_DOUBLE:
620 case EXIF_FORMAT_FLOAT:
621 default:
622 snprintf (val, maxlen, _("%i bytes unsupported data type"),
623 e->size);
624 break;
625 }
626 }
627
628 void
exif_entry_dump(ExifEntry * e,unsigned int indent)629 exif_entry_dump (ExifEntry *e, unsigned int indent)
630 {
631 char buf[1024];
632 char value[1024];
633 unsigned int l;
634
635 if (!e)
636 return;
637
638 l = MIN(sizeof(buf)-1, 2*indent);
639 memset(buf, ' ', l);
640 buf[l] = '\0';
641
642 printf ("%sTag: 0x%x ('%s')\n", buf, e->tag,
643 exif_tag_get_name_in_ifd (e->tag, exif_entry_get_ifd(e)));
644 printf ("%s Format: %i ('%s')\n", buf, e->format,
645 exif_format_get_name (e->format));
646 printf ("%s Components: %i\n", buf, (int) e->components);
647 printf ("%s Offset: %lu\n", buf, e->offset);
648 printf ("%s Size: %u\n", buf, e->size);
649 printf ("%s Value: %s\n", buf, exif_entry_get_value (e, value, sizeof(value)));
650 }
651
652 /*! Check if a string consists entirely of a single, repeated character.
653 * Up to first n bytes are checked.
654 *
655 * \param[in] data pointer of string to check
656 * \param[in] ch character to match
657 * \param[in] n maximum number of characters to match
658 *
659 * \return 0 if the string matches or is of zero length, nonzero otherwise
660 */
661 static int
match_repeated_char(const unsigned char * data,unsigned char ch,size_t n)662 match_repeated_char(const unsigned char *data, unsigned char ch, size_t n)
663 {
664 int i;
665 for (i=n; i; --i, ++data) {
666 if (*data == 0) {
667 i = 0; /* all bytes before NUL matched */
668 break;
669 }
670 if (*data != ch)
671 break;
672 }
673 return i;
674 }
675
676 #define CF(entry,target,v,maxlen) \
677 { \
678 if (entry->format != target) { \
679 exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA, \
680 _("The tag '%s' contains data of an invalid " \
681 "format ('%s', expected '%s')."), \
682 exif_tag_get_name (entry->tag), \
683 exif_format_get_name (entry->format), \
684 exif_format_get_name (target)); \
685 break; \
686 } \
687 }
688
689 #define CC(entry,target,v,maxlen) \
690 { \
691 if (entry->components != target) { \
692 exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA, \
693 _("The tag '%s' contains an invalid number of " \
694 "components (%i, expected %i)."), \
695 exif_tag_get_name (entry->tag), \
696 (int) entry->components, (int) target); \
697 break; \
698 } \
699 }
700
701 static const struct {
702 ExifTag tag;
703 const char *strings[10];
704 } list[] = {
705 #ifndef NO_VERBOSE_TAG_DATA
706 { EXIF_TAG_PLANAR_CONFIGURATION,
707 { "", N_("Chunky format"), N_("Planar format"), NULL}},
708 { EXIF_TAG_SENSING_METHOD,
709 { "", N_("Not defined"), N_("One-chip color area sensor"),
710 N_("Two-chip color area sensor"), N_("Three-chip color area sensor"),
711 N_("Color sequential area sensor"), "", N_("Trilinear sensor"),
712 N_("Color sequential linear sensor"), NULL}},
713 { EXIF_TAG_ORIENTATION,
714 { "", N_("Top-left"), N_("Top-right"), N_("Bottom-right"),
715 N_("Bottom-left"), N_("Left-top"), N_("Right-top"),
716 N_("Right-bottom"), N_("Left-bottom"), NULL}},
717 { EXIF_TAG_YCBCR_POSITIONING,
718 { "", N_("Centered"), N_("Co-sited"), NULL}},
719 { EXIF_TAG_PHOTOMETRIC_INTERPRETATION,
720 { N_("Reversed mono"), N_("Normal mono"), N_("RGB"), N_("Palette"), "",
721 N_("CMYK"), N_("YCbCr"), "", N_("CieLAB"), NULL}},
722 { EXIF_TAG_CUSTOM_RENDERED,
723 { N_("Normal process"), N_("Custom process"), NULL}},
724 { EXIF_TAG_EXPOSURE_MODE,
725 { N_("Auto exposure"), N_("Manual exposure"), N_("Auto bracket"), NULL}},
726 { EXIF_TAG_WHITE_BALANCE,
727 { N_("Auto white balance"), N_("Manual white balance"), NULL}},
728 { EXIF_TAG_SCENE_CAPTURE_TYPE,
729 { N_("Standard"), N_("Landscape"), N_("Portrait"),
730 N_("Night scene"), NULL}},
731 { EXIF_TAG_GAIN_CONTROL,
732 { N_("Normal"), N_("Low gain up"), N_("High gain up"),
733 N_("Low gain down"), N_("High gain down"), NULL}},
734 { EXIF_TAG_SATURATION,
735 { N_("Normal"), N_("Low saturation"), N_("High saturation"), NULL}},
736 { EXIF_TAG_CONTRAST , {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
737 { EXIF_TAG_SHARPNESS, {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
738 #endif
739 { 0, {NULL}}
740 };
741
742 static const struct {
743 ExifTag tag;
744 struct {
745 ExifShort index;
746 const char *values[4]; /*!< list of progressively shorter string
747 descriptions; the longest one that fits will be
748 selected */
749 } elem[25];
750 } list2[] = {
751 #ifndef NO_VERBOSE_TAG_DATA
752 { EXIF_TAG_METERING_MODE,
753 { { 0, {N_("Unknown"), NULL}},
754 { 1, {N_("Average"), N_("Avg"), NULL}},
755 { 2, {N_("Center-weighted average"), N_("Center-weight"), NULL}},
756 { 3, {N_("Spot"), NULL}},
757 { 4, {N_("Multi spot"), NULL}},
758 { 5, {N_("Pattern"), NULL}},
759 { 6, {N_("Partial"), NULL}},
760 {255, {N_("Other"), NULL}},
761 { 0, {NULL}}}},
762 { EXIF_TAG_COMPRESSION,
763 { {1, {N_("Uncompressed"), NULL}},
764 {5, {N_("LZW compression"), NULL}},
765 {6, {N_("JPEG compression"), NULL}},
766 {7, {N_("JPEG compression"), NULL}},
767 {8, {N_("Deflate/ZIP compression"), NULL}},
768 {32773, {N_("PackBits compression"), NULL}},
769 {0, {NULL}}}},
770 { EXIF_TAG_LIGHT_SOURCE,
771 { { 0, {N_("Unknown"), NULL}},
772 { 1, {N_("Daylight"), NULL}},
773 { 2, {N_("Fluorescent"), NULL}},
774 { 3, {N_("Tungsten incandescent light"), N_("Tungsten"), NULL}},
775 { 4, {N_("Flash"), NULL}},
776 { 9, {N_("Fine weather"), NULL}},
777 { 10, {N_("Cloudy weather"), N_("Cloudy"), NULL}},
778 { 11, {N_("Shade"), NULL}},
779 { 12, {N_("Daylight fluorescent"), NULL}},
780 { 13, {N_("Day white fluorescent"), NULL}},
781 { 14, {N_("Cool white fluorescent"), NULL}},
782 { 15, {N_("White fluorescent"), NULL}},
783 { 17, {N_("Standard light A"), NULL}},
784 { 18, {N_("Standard light B"), NULL}},
785 { 19, {N_("Standard light C"), NULL}},
786 { 20, {N_("D55"), NULL}},
787 { 21, {N_("D65"), NULL}},
788 { 22, {N_("D75"), NULL}},
789 { 24, {N_("ISO studio tungsten"),NULL}},
790 {255, {N_("Other"), NULL}},
791 { 0, {NULL}}}},
792 { EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT,
793 { {2, {N_("Inch"), N_("in"), NULL}},
794 {3, {N_("Centimeter"), N_("cm"), NULL}},
795 {0, {NULL}}}},
796 { EXIF_TAG_RESOLUTION_UNIT,
797 { {2, {N_("Inch"), N_("in"), NULL}},
798 {3, {N_("Centimeter"), N_("cm"), NULL}},
799 {0, {NULL}}}},
800 { EXIF_TAG_EXPOSURE_PROGRAM,
801 { {0, {N_("Not defined"), NULL}},
802 {1, {N_("Manual"), NULL}},
803 {2, {N_("Normal program"), N_("Normal"), NULL}},
804 {3, {N_("Aperture priority"), N_("Aperture"), NULL}},
805 {4, {N_("Shutter priority"),N_("Shutter"), NULL}},
806 {5, {N_("Creative program (biased toward depth of field)"),
807 N_("Creative"), NULL}},
808 {6, {N_("Creative program (biased toward fast shutter speed)"),
809 N_("Action"), NULL}},
810 {7, {N_("Portrait mode (for closeup photos with the background out "
811 "of focus)"), N_("Portrait"), NULL}},
812 {8, {N_("Landscape mode (for landscape photos with the background "
813 "in focus)"), N_("Landscape"), NULL}},
814 {0, {NULL}}}},
815 { EXIF_TAG_SENSITIVITY_TYPE,
816 { {0, {N_("Unknown"), NULL}},
817 {1, {N_("Standard output sensitivity (SOS)"), NULL}},
818 {2, {N_("Recommended exposure index (REI)"), NULL}},
819 {3, {N_("ISO speed"), NULL}},
820 {4, {N_("Standard output sensitivity (SOS) and recommended exposure index (REI)"), NULL}},
821 {5, {N_("Standard output sensitivity (SOS) and ISO speed"), NULL}},
822 {6, {N_("Recommended exposure index (REI) and ISO speed"), NULL}},
823 {7, {N_("Standard output sensitivity (SOS) and recommended exposure index (REI) and ISO speed"), NULL}},
824 {0, {NULL}}}},
825 { EXIF_TAG_FLASH,
826 { {0x0000, {N_("Flash did not fire"), N_("No flash"), NULL}},
827 {0x0001, {N_("Flash fired"), N_("Flash"), N_("Yes"), NULL}},
828 {0x0005, {N_("Strobe return light not detected"), N_("Without strobe"),
829 NULL}},
830 {0x0007, {N_("Strobe return light detected"), N_("With strobe"), NULL}},
831 {0x0008, {N_("Flash did not fire"), NULL}}, /* Olympus E-330 */
832 {0x0009, {N_("Flash fired, compulsory flash mode"), NULL}},
833 {0x000d, {N_("Flash fired, compulsory flash mode, return light "
834 "not detected"), NULL}},
835 {0x000f, {N_("Flash fired, compulsory flash mode, return light "
836 "detected"), NULL}},
837 {0x0010, {N_("Flash did not fire, compulsory flash mode"), NULL}},
838 {0x0018, {N_("Flash did not fire, auto mode"), NULL}},
839 {0x0019, {N_("Flash fired, auto mode"), NULL}},
840 {0x001d, {N_("Flash fired, auto mode, return light not detected"),
841 NULL}},
842 {0x001f, {N_("Flash fired, auto mode, return light detected"), NULL}},
843 {0x0020, {N_("No flash function"),NULL}},
844 {0x0041, {N_("Flash fired, red-eye reduction mode"), NULL}},
845 {0x0045, {N_("Flash fired, red-eye reduction mode, return light "
846 "not detected"), NULL}},
847 {0x0047, {N_("Flash fired, red-eye reduction mode, return light "
848 "detected"), NULL}},
849 {0x0049, {N_("Flash fired, compulsory flash mode, red-eye reduction "
850 "mode"), NULL}},
851 {0x004d, {N_("Flash fired, compulsory flash mode, red-eye reduction "
852 "mode, return light not detected"), NULL}},
853 {0x004f, {N_("Flash fired, compulsory flash mode, red-eye reduction mode, "
854 "return light detected"), NULL}},
855 {0x0058, {N_("Flash did not fire, auto mode, red-eye reduction mode"), NULL}},
856 {0x0059, {N_("Flash fired, auto mode, red-eye reduction mode"), NULL}},
857 {0x005d, {N_("Flash fired, auto mode, return light not detected, "
858 "red-eye reduction mode"), NULL}},
859 {0x005f, {N_("Flash fired, auto mode, return light detected, "
860 "red-eye reduction mode"), NULL}},
861 {0x0000, {NULL}}}},
862 { EXIF_TAG_SUBJECT_DISTANCE_RANGE,
863 { {0, {N_("Unknown"), N_("?"), NULL}},
864 {1, {N_("Macro"), NULL}},
865 {2, {N_("Close view"), N_("Close"), NULL}},
866 {3, {N_("Distant view"), N_("Distant"), NULL}},
867 {0, {NULL}}}},
868 { EXIF_TAG_COLOR_SPACE,
869 { {1, {N_("sRGB"), NULL}},
870 {2, {N_("Adobe RGB"), NULL}},
871 {0xffff, {N_("Uncalibrated"), NULL}},
872 {0x0000, {NULL}}}},
873 #endif
874 {0, { { 0, {NULL}}} }
875 };
876
877 const char *
exif_entry_get_value(ExifEntry * e,char * val,unsigned int maxlen)878 exif_entry_get_value (ExifEntry *e, char *val, unsigned int maxlen)
879 {
880 unsigned int i, j, k;
881 ExifShort v_short, v_short2, v_short3, v_short4;
882 ExifByte v_byte;
883 ExifRational v_rat;
884 ExifSRational v_srat;
885 char b[64];
886 const char *c;
887 ExifByteOrder o;
888 double d;
889 ExifEntry *entry;
890 static const struct {
891 char label[5];
892 char major, minor;
893 } versions[] = {
894 {"0110", 1, 1},
895 {"0120", 1, 2},
896 {"0200", 2, 0},
897 {"0210", 2, 1},
898 {"0220", 2, 2},
899 {"0221", 2, 21},
900 {"0230", 2, 3},
901 {"0231", 2, 31},
902 {"0232", 2, 32},
903 {"" , 0, 0}
904 };
905
906 (void) bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
907
908 if (!e || !e->parent || !e->parent->parent || !maxlen || !val)
909 return val;
910
911 /* make sure the returned string is zero terminated */
912 /* FIXME: this is inefficient in the case of long buffers and should
913 * instead be taken care of on each write instead. */
914 memset (val, 0, maxlen);
915
916 /* We need the byte order */
917 o = exif_data_get_byte_order (e->parent->parent);
918
919 /* Sanity check */
920 if (e->size != e->components * exif_format_get_size (e->format)) {
921 snprintf (val, maxlen, _("Invalid size of entry (%i, "
922 "expected %li x %i)."), e->size, e->components,
923 exif_format_get_size (e->format));
924 return val;
925 }
926
927 switch (e->tag) {
928 case EXIF_TAG_USER_COMMENT:
929 case EXIF_TAG_SPATIAL_FREQUENCY_RESPONSE:
930 case EXIF_TAG_DEVICE_SETTING_DESCRIPTION:
931 case EXIF_TAG_GPS_PROCESSING_METHOD:
932 case EXIF_TAG_GPS_AREA_INFORMATION:
933 case EXIF_TAG_SOURCE_EXPOSURE_TIMES_OF_COMPOSITE_IMAGE:
934 /*
935 * The specification says UNDEFINED, but some
936 * manufacturers don't care and use ASCII. If this is the
937 * case here, only refuse to read it if there is no chance
938 * of finding readable data.
939 */
940 if ((e->format != EXIF_FORMAT_ASCII) ||
941 (e->size <= 8) ||
942 ( memcmp (e->data, "ASCII\0\0\0" , 8) &&
943 memcmp (e->data, "UNICODE\0" , 8) &&
944 memcmp (e->data, "JIS\0\0\0\0\0", 8) &&
945 memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)))
946 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
947
948 /*
949 * Note that, according to the specification (V2.1, p 40),
950 * the user comment field does not have to be
951 * NULL terminated.
952 */
953 if ((e->size >= 8) && !memcmp (e->data, "ASCII\0\0\0", 8)) {
954 strncpy (val, (char *) e->data + 8, MIN (e->size - 8, maxlen-1));
955 break;
956 }
957 if ((e->size >= 8) && !memcmp (e->data, "UNICODE\0", 8)) {
958 strncpy (val, _("Unsupported UNICODE string"), maxlen-1);
959 /* FIXME: use iconv to convert into the locale encoding.
960 * EXIF 2.2 implies (but does not say) that this encoding is
961 * UCS-2.
962 */
963 break;
964 }
965 if ((e->size >= 8) && !memcmp (e->data, "JIS\0\0\0\0\0", 8)) {
966 strncpy (val, _("Unsupported JIS string"), maxlen-1);
967 /* FIXME: use iconv to convert into the locale encoding */
968 break;
969 }
970
971 /* Check if there is really some information in the tag. */
972 for (i = 0; (i < e->size) &&
973 (!e->data[i] || (e->data[i] == ' ')); i++);
974 if (i == e->size) break;
975
976 /*
977 * If we reach this point, the tag does not
978 * comply with the standard but seems to contain data.
979 * Print as much as possible.
980 * Note: make sure we do not overwrite the final \0 at maxlen-1
981 */
982 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
983 _("Tag UserComment contains data but is "
984 "against specification."));
985 for (j = 0; (i < e->size) && (j < maxlen-1); i++, j++) {
986 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
987 _("Byte at position %i: 0x%02x"), i, e->data[i]);
988 val[j] = isprint (e->data[i]) ? e->data[i] : '.';
989 }
990 break;
991
992 case EXIF_TAG_EXIF_VERSION:
993 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
994 CC (e, 4, val, maxlen);
995 strncpy (val, _("Unknown Exif Version"), maxlen-1);
996 for (i = 0; *versions[i].label; i++) {
997 if (!memcmp (e->data, versions[i].label, 4)) {
998 snprintf (val, maxlen,
999 _("Exif Version %d.%d"),
1000 versions[i].major,
1001 versions[i].minor);
1002 break;
1003 }
1004 }
1005 break;
1006 case EXIF_TAG_FLASH_PIX_VERSION:
1007 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
1008 CC (e, 4, val, maxlen);
1009 if (!memcmp (e->data, "0100", 4))
1010 strncpy (val, _("FlashPix Version 1.0"), maxlen-1);
1011 else if (!memcmp (e->data, "0101", 4))
1012 strncpy (val, _("FlashPix Version 1.01"), maxlen-1);
1013 else
1014 strncpy (val, _("Unknown FlashPix Version"), maxlen-1);
1015 break;
1016 case EXIF_TAG_COPYRIGHT:
1017 CF (e, EXIF_FORMAT_ASCII, val, maxlen);
1018
1019 /*
1020 * First part: Photographer.
1021 * Some cameras store a string like " " here. Ignore it.
1022 * Remember that a corrupted tag might not be NUL-terminated
1023 */
1024 if (e->size && e->data && match_repeated_char(e->data, ' ', e->size))
1025 strncpy (val, (char *) e->data, MIN (maxlen-1, e->size));
1026 else
1027 strncpy (val, _("[None]"), maxlen-1);
1028 strncat (val, " ", maxlen-1 - strlen (val));
1029 strncat (val, _("(Photographer)"), maxlen-1 - strlen (val));
1030
1031 /* Second part: Editor. */
1032 strncat (val, " - ", maxlen-1 - strlen (val));
1033 k = 0;
1034 if (e->size && e->data) {
1035 const unsigned char *tagdata = memchr(e->data, 0, e->size);
1036 if (tagdata++) {
1037 unsigned int editor_ofs = tagdata - e->data;
1038 unsigned int remaining = e->size - editor_ofs;
1039 if (match_repeated_char(tagdata, ' ', remaining)) {
1040 strncat (val, (const char*)tagdata, MIN (maxlen-1 - strlen (val), remaining));
1041 ++k;
1042 }
1043 }
1044 }
1045 if (!k)
1046 strncat (val, _("[None]"), maxlen-1 - strlen (val));
1047 strncat (val, " ", maxlen-1 - strlen (val));
1048 strncat (val, _("(Editor)"), maxlen-1 - strlen (val));
1049
1050 break;
1051 case EXIF_TAG_FNUMBER:
1052 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1053 CC (e, 1, val, maxlen);
1054 v_rat = exif_get_rational (e->data, o);
1055 if (!v_rat.denominator) {
1056 exif_entry_format_value(e, val, maxlen);
1057 break;
1058 }
1059 d = (double) v_rat.numerator / (double) v_rat.denominator;
1060 snprintf (val, maxlen, "f/%.01f", d);
1061 break;
1062 case EXIF_TAG_APERTURE_VALUE:
1063 case EXIF_TAG_MAX_APERTURE_VALUE:
1064 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1065 CC (e, 1, val, maxlen);
1066 v_rat = exif_get_rational (e->data, o);
1067 if (!v_rat.denominator || (0x80000000 == v_rat.numerator)) {
1068 exif_entry_format_value(e, val, maxlen);
1069 break;
1070 }
1071 d = (double) v_rat.numerator / (double) v_rat.denominator;
1072 snprintf (val, maxlen, _("%.02f EV"), d);
1073 snprintf (b, sizeof (b), _(" (f/%.01f)"), pow (2, d / 2.));
1074 strncat (val, b, maxlen-1 - strlen (val));
1075 break;
1076 case EXIF_TAG_FOCAL_LENGTH:
1077 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1078 CC (e, 1, val, maxlen);
1079 v_rat = exif_get_rational (e->data, o);
1080 if (!v_rat.denominator) {
1081 exif_entry_format_value(e, val, maxlen);
1082 break;
1083 }
1084
1085 /*
1086 * For calculation of the 35mm equivalent,
1087 * Minolta cameras need a multiplier that depends on the
1088 * camera model.
1089 */
1090 d = 0.;
1091 entry = exif_content_get_entry (
1092 e->parent->parent->ifd[EXIF_IFD_0], EXIF_TAG_MAKE);
1093 if (entry && entry->data && entry->size >= 7 &&
1094 !strncmp ((char *)entry->data, "Minolta", 7)) {
1095 entry = exif_content_get_entry (
1096 e->parent->parent->ifd[EXIF_IFD_0],
1097 EXIF_TAG_MODEL);
1098 if (entry && entry->data && entry->size >= 8) {
1099 if (!strncmp ((char *)entry->data, "DiMAGE 7", 8))
1100 d = 3.9;
1101 else if (!strncmp ((char *)entry->data, "DiMAGE 5", 8))
1102 d = 4.9;
1103 }
1104 }
1105 if (d)
1106 snprintf (b, sizeof (b), _(" (35 equivalent: %.0f mm)"),
1107 (d * (double) v_rat.numerator /
1108 (double) v_rat.denominator));
1109 else
1110 b[0] = 0;
1111
1112 d = (double) v_rat.numerator / (double) v_rat.denominator;
1113 snprintf (val, maxlen, "%.1f mm", d);
1114 strncat (val, b, maxlen-1 - strlen (val));
1115 break;
1116 case EXIF_TAG_SUBJECT_DISTANCE:
1117 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1118 CC (e, 1, val, maxlen);
1119 v_rat = exif_get_rational (e->data, o);
1120 if (!v_rat.denominator) {
1121 exif_entry_format_value(e, val, maxlen);
1122 break;
1123 }
1124 d = (double) v_rat.numerator / (double) v_rat.denominator;
1125 snprintf (val, maxlen, "%.1f m", d);
1126 break;
1127 case EXIF_TAG_EXPOSURE_TIME:
1128 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1129 CC (e, 1, val, maxlen);
1130 v_rat = exif_get_rational (e->data, o);
1131 if (!v_rat.denominator) {
1132 exif_entry_format_value(e, val, maxlen);
1133 break;
1134 }
1135 d = (double) v_rat.numerator / (double) v_rat.denominator;
1136 unsigned int g = gcd_uint32_t(v_rat.numerator, v_rat.denominator);
1137 unsigned int min_numerator = v_rat.numerator / g;
1138 unsigned int min_denominator = v_rat.denominator / g;
1139 if (d < 1 && d) {
1140 int cd = count_decimal(d);
1141 if (min_numerator == 1) {
1142 if (min_denominator == 2) {
1143 snprintf (val, maxlen, _("%.1f"), d);
1144 } else {
1145 snprintf (val, maxlen, _("%d/%d"), min_numerator, min_denominator);
1146 }
1147 } else if (cd <= 1) {
1148 snprintf (val, maxlen, _("%.1f"), d);
1149 } else {
1150 snprintf (val, maxlen, _("1/%.0f"), 1. / d);
1151 }
1152 } else {
1153 if (min_denominator == 1) {
1154 snprintf (val, maxlen, "%.0f", d);
1155 } else {
1156 snprintf (val, maxlen, "%.1f", d);
1157 }
1158 }
1159 strncat (val, _(" sec."), maxlen-1 - strlen (val));
1160 break;
1161 case EXIF_TAG_SHUTTER_SPEED_VALUE:
1162 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
1163 CC (e, 1, val, maxlen);
1164 v_srat = exif_get_srational (e->data, o);
1165 if (!v_srat.denominator) {
1166 exif_entry_format_value(e, val, maxlen);
1167 break;
1168 }
1169 d = (double) v_srat.numerator / (double) v_srat.denominator;
1170 snprintf (val, maxlen, _("%.02f EV"), d);
1171 if (pow (2, d))
1172 d = 1. / pow (2, d);
1173 if (d < 1 && d)
1174 snprintf (b, sizeof (b), _(" (1/%.0f sec.)"), 1. / d);
1175 else
1176 snprintf (b, sizeof (b), _(" (%.0f sec.)"), d);
1177 strncat (val, b, maxlen-1 - strlen (val));
1178 break;
1179 case EXIF_TAG_BRIGHTNESS_VALUE:
1180 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
1181 CC (e, 1, val, maxlen);
1182 v_srat = exif_get_srational (e->data, o);
1183 if (!v_srat.denominator) {
1184 exif_entry_format_value(e, val, maxlen);
1185 break;
1186 }
1187 d = (double) v_srat.numerator / (double) v_srat.denominator;
1188 snprintf (val, maxlen, _("%.02f EV"), d);
1189 snprintf (b, sizeof (b), _(" (%.02f cd/m^2)"),
1190 1. / (M_PI * 0.3048 * 0.3048) * pow (2, d));
1191 strncat (val, b, maxlen-1 - strlen (val));
1192 break;
1193 case EXIF_TAG_FILE_SOURCE:
1194 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
1195 CC (e, 1, val, maxlen);
1196 v_byte = e->data[0];
1197 if (v_byte == 3)
1198 strncpy (val, _("DSC"), maxlen-1);
1199 else
1200 snprintf (val, maxlen, _("Internal error (unknown "
1201 "value %i)"), v_byte);
1202 break;
1203 case EXIF_TAG_COMPONENTS_CONFIGURATION:
1204 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
1205 CC (e, 4, val, maxlen);
1206 for (i = 0; i < 4; i++) {
1207 switch (e->data[i]) {
1208 case 0: c = _("-"); break;
1209 case 1: c = _("Y"); break;
1210 case 2: c = _("Cb"); break;
1211 case 3: c = _("Cr"); break;
1212 case 4: c = _("R"); break;
1213 case 5: c = _("G"); break;
1214 case 6: c = _("B"); break;
1215 default: c = _("Reserved"); break;
1216 }
1217 strncat (val, c, maxlen-1 - strlen (val));
1218 if (i < 3)
1219 strncat (val, " ", maxlen-1 - strlen (val));
1220 }
1221 break;
1222 case EXIF_TAG_EXPOSURE_BIAS_VALUE:
1223 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
1224 CC (e, 1, val, maxlen);
1225 v_srat = exif_get_srational (e->data, o);
1226 if (!v_srat.denominator) {
1227 exif_entry_format_value(e, val, maxlen);
1228 break;
1229 }
1230 d = (double) v_srat.numerator / (double) v_srat.denominator;
1231 snprintf (val, maxlen, _("%.02f EV"), d);
1232 break;
1233 case EXIF_TAG_SCENE_TYPE:
1234 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
1235 CC (e, 1, val, maxlen);
1236 v_byte = e->data[0];
1237 if (v_byte == 1)
1238 strncpy (val, _("Directly photographed"), maxlen-1);
1239 else
1240 snprintf (val, maxlen, _("Internal error (unknown "
1241 "value %i)"), v_byte);
1242 break;
1243 case EXIF_TAG_YCBCR_SUB_SAMPLING:
1244 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
1245 CC (e, 2, val, maxlen);
1246 v_short = exif_get_short (e->data, o);
1247 v_short2 = exif_get_short (
1248 e->data + exif_format_get_size (e->format),
1249 o);
1250 if ((v_short == 2) && (v_short2 == 1))
1251 strncpy (val, _("YCbCr4:2:2"), maxlen-1);
1252 else if ((v_short == 2) && (v_short2 == 2))
1253 strncpy (val, _("YCbCr4:2:0"), maxlen-1);
1254 else
1255 snprintf (val, maxlen, "%u, %u", v_short, v_short2);
1256 break;
1257 case EXIF_TAG_SUBJECT_AREA:
1258 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
1259 switch (e->components) {
1260 case 2:
1261 v_short = exif_get_short (e->data, o);
1262 v_short2 = exif_get_short (e->data + 2, o);
1263 snprintf (val, maxlen, "(x,y) = (%i,%i)",
1264 v_short, v_short2);
1265 break;
1266 case 3:
1267 v_short = exif_get_short (e->data, o);
1268 v_short2 = exif_get_short (e->data + 2, o);
1269 v_short3 = exif_get_short (e->data + 4, o);
1270 snprintf (val, maxlen, _("Within distance %i of "
1271 "(x,y) = (%i,%i)"), v_short3, v_short,
1272 v_short2);
1273 break;
1274 case 4:
1275 v_short = exif_get_short (e->data, o);
1276 v_short2 = exif_get_short (e->data + 2, o);
1277 v_short3 = exif_get_short (e->data + 4, o);
1278 v_short4 = exif_get_short (e->data + 6, o);
1279 snprintf (val, maxlen, _("Within rectangle "
1280 "(width %i, height %i) around "
1281 "(x,y) = (%i,%i)"), v_short3, v_short4,
1282 v_short, v_short2);
1283 break;
1284 default:
1285 snprintf (val, maxlen, _("Unexpected number "
1286 "of components (%li, expected 2, 3, or 4)."),
1287 e->components);
1288 }
1289 break;
1290 case EXIF_TAG_GPS_VERSION_ID:
1291 /* This is only valid in the GPS IFD */
1292 CF (e, EXIF_FORMAT_BYTE, val, maxlen);
1293 CC (e, 4, val, maxlen);
1294 v_byte = e->data[0];
1295 snprintf (val, maxlen, "%u", v_byte);
1296 for (i = 1; i < e->components; i++) {
1297 v_byte = e->data[i];
1298 snprintf (b, sizeof (b), ".%u", v_byte);
1299 strncat (val, b, maxlen-1 - strlen (val));
1300 }
1301 break;
1302 case EXIF_TAG_INTEROPERABILITY_VERSION:
1303 /* a.k.a. case EXIF_TAG_GPS_LATITUDE: */
1304 /* This tag occurs in EXIF_IFD_INTEROPERABILITY */
1305 if (e->format == EXIF_FORMAT_UNDEFINED) {
1306 strncpy (val, (char *) e->data, MIN (maxlen-1, e->size));
1307 break;
1308 }
1309 /* EXIF_TAG_GPS_LATITUDE is the same numerically as
1310 * EXIF_TAG_INTEROPERABILITY_VERSION but in EXIF_IFD_GPS
1311 */
1312 exif_entry_format_value(e, val, maxlen);
1313 break;
1314 case EXIF_TAG_GPS_ALTITUDE_REF:
1315 /* This is only valid in the GPS IFD */
1316 CF (e, EXIF_FORMAT_BYTE, val, maxlen);
1317 CC (e, 1, val, maxlen);
1318 v_byte = e->data[0];
1319 if (v_byte == 0)
1320 strncpy (val, _("Sea level"), maxlen-1);
1321 else if (v_byte == 1)
1322 strncpy (val, _("Sea level reference"), maxlen-1);
1323 else
1324 snprintf (val, maxlen, _("Internal error (unknown "
1325 "value %i)"), v_byte);
1326 break;
1327 case EXIF_TAG_GPS_TIME_STAMP:
1328 /* This is only valid in the GPS IFD */
1329 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1330 CC (e, 3, val, maxlen);
1331
1332 v_rat = exif_get_rational (e->data, o);
1333 if (!v_rat.denominator) {
1334 exif_entry_format_value(e, val, maxlen);
1335 break;
1336 }
1337 i = v_rat.numerator / v_rat.denominator;
1338
1339 v_rat = exif_get_rational (e->data +
1340 exif_format_get_size (e->format),
1341 o);
1342 if (!v_rat.denominator) {
1343 exif_entry_format_value(e, val, maxlen);
1344 break;
1345 }
1346 j = v_rat.numerator / v_rat.denominator;
1347
1348 v_rat = exif_get_rational (e->data +
1349 2*exif_format_get_size (e->format),
1350 o);
1351 if (!v_rat.denominator) {
1352 exif_entry_format_value(e, val, maxlen);
1353 break;
1354 }
1355 d = (double) v_rat.numerator / (double) v_rat.denominator;
1356 snprintf (val, maxlen, "%02u:%02u:%05.2f", i, j, d);
1357 break;
1358
1359 case EXIF_TAG_METERING_MODE:
1360 case EXIF_TAG_COMPRESSION:
1361 case EXIF_TAG_LIGHT_SOURCE:
1362 case EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT:
1363 case EXIF_TAG_RESOLUTION_UNIT:
1364 case EXIF_TAG_EXPOSURE_PROGRAM:
1365 case EXIF_TAG_SENSITIVITY_TYPE:
1366 case EXIF_TAG_FLASH:
1367 case EXIF_TAG_SUBJECT_DISTANCE_RANGE:
1368 case EXIF_TAG_COLOR_SPACE:
1369 CF (e,EXIF_FORMAT_SHORT, val, maxlen);
1370 CC (e, 1, val, maxlen);
1371 v_short = exif_get_short (e->data, o);
1372
1373 /* Search the tag */
1374 for (i = 0; list2[i].tag && (list2[i].tag != e->tag); i++);
1375 if (!list2[i].tag) {
1376 snprintf (val, maxlen, _("Internal error (unknown "
1377 "value %i)"), v_short);
1378 break;
1379 }
1380
1381 /* Find the value */
1382 for (j = 0; list2[i].elem[j].values[0] &&
1383 (list2[i].elem[j].index < v_short); j++);
1384 if (list2[i].elem[j].index != v_short) {
1385 snprintf (val, maxlen, _("Internal error (unknown "
1386 "value %i)"), v_short);
1387 break;
1388 }
1389
1390 /* Find a short enough value */
1391 memset (val, 0, maxlen);
1392 for (k = 0; list2[i].elem[j].values[k]; k++) {
1393 size_t l = strlen (_(list2[i].elem[j].values[k]));
1394 if ((maxlen > l) && (strlen (val) < l))
1395 strncpy (val, _(list2[i].elem[j].values[k]), maxlen-1);
1396 }
1397 if (!val[0]) snprintf (val, maxlen, "%i", v_short);
1398
1399 break;
1400
1401 case EXIF_TAG_PLANAR_CONFIGURATION:
1402 case EXIF_TAG_SENSING_METHOD:
1403 case EXIF_TAG_ORIENTATION:
1404 case EXIF_TAG_YCBCR_POSITIONING:
1405 case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
1406 case EXIF_TAG_CUSTOM_RENDERED:
1407 case EXIF_TAG_EXPOSURE_MODE:
1408 case EXIF_TAG_WHITE_BALANCE:
1409 case EXIF_TAG_SCENE_CAPTURE_TYPE:
1410 case EXIF_TAG_GAIN_CONTROL:
1411 case EXIF_TAG_SATURATION:
1412 case EXIF_TAG_CONTRAST:
1413 case EXIF_TAG_SHARPNESS:
1414 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
1415 CC (e, 1, val, maxlen);
1416 v_short = exif_get_short (e->data, o);
1417
1418 /* Search the tag */
1419 for (i = 0; list[i].tag && (list[i].tag != e->tag); i++);
1420 if (!list[i].tag) {
1421 snprintf (val, maxlen, _("Internal error (unknown "
1422 "value %i)"), v_short);
1423 break;
1424 }
1425
1426 /* Find the value */
1427 for (j = 0; list[i].strings[j] && (j < v_short); j++);
1428 if (!list[i].strings[j])
1429 snprintf (val, maxlen, "%i", v_short);
1430 else if (!*list[i].strings[j])
1431 snprintf (val, maxlen, _("Unknown value %i"), v_short);
1432 else
1433 strncpy (val, _(list[i].strings[j]), maxlen-1);
1434 break;
1435
1436 case EXIF_TAG_XP_TITLE:
1437 case EXIF_TAG_XP_COMMENT:
1438 case EXIF_TAG_XP_AUTHOR:
1439 case EXIF_TAG_XP_KEYWORDS:
1440 case EXIF_TAG_XP_SUBJECT:
1441 {
1442 unsigned char *utf16;
1443
1444 /* Sanity check the size to prevent overflow. Note EXIF files are 64kb at most. */
1445 if (e->size >= 65536 - sizeof(uint16_t)*2) break;
1446
1447 /* The tag may not be U+0000-terminated , so make a local
1448 U+0000-terminated copy before converting it */
1449 utf16 = exif_mem_alloc (e->priv->mem, e->size+sizeof(uint16_t)+1);
1450 if (!utf16) break;
1451 memcpy(utf16, e->data, e->size);
1452
1453 /* NUL terminate the string. If the size is odd (which isn't possible
1454 * for a valid UTF16 string), then this will overwrite the high byte of
1455 * the final half word, plus add a full zero NUL word at the end.
1456 */
1457 utf16[e->size] = 0;
1458 utf16[e->size+1] = 0;
1459 utf16[e->size+2] = 0;
1460
1461 /* Warning! The texts are converted from UTF16 to UTF8 */
1462 /* FIXME: use iconv to convert into the locale encoding */
1463 exif_convert_utf16_to_utf8(val, utf16, maxlen);
1464 exif_mem_free(e->priv->mem, utf16);
1465 break;
1466 }
1467
1468 default:
1469 /* Use a generic value formatting */
1470 exif_entry_format_value(e, val, maxlen);
1471 }
1472
1473 return val;
1474 }
1475
1476 static
exif_entry_initialize_gps(ExifEntry * e,ExifTag tag)1477 void exif_entry_initialize_gps(ExifEntry *e, ExifTag tag) {
1478 const ExifGPSIfdTagInfo* info = exif_get_gps_tag_info(tag);
1479
1480 if(!info) {
1481 e->components = 0;
1482 e->format = EXIF_FORMAT_UNDEFINED;
1483 e->size = 0;
1484 e->data = NULL;
1485 return;
1486 }
1487
1488 e->format = info->format;
1489 e->components = info->components;
1490
1491 if(info->components == 0) {
1492 /* No pre-allocation */
1493 e->size = 0;
1494 e->data = NULL;
1495 } else {
1496 int hasDefault = (info->default_size && info->default_value);
1497 unsigned int allocSize = hasDefault ? info->default_size : (exif_format_get_size (e->format) * e->components);
1498 e->size = allocSize;
1499 e->data = exif_entry_alloc (e, e->size);
1500 if(!e->data) {
1501 clear_entry(e);
1502 return;
1503 }
1504 if(hasDefault) {
1505 if (e->size < info->default_size) return;
1506 memcpy(e->data, info->default_value, info->default_size);
1507 }
1508 }
1509 }
1510
1511 /*!
1512 * \bug Log and report failed exif_mem_malloc() calls.
1513 */
1514 void
exif_entry_initialize(ExifEntry * e,ExifTag tag)1515 exif_entry_initialize (ExifEntry *e, ExifTag tag)
1516 {
1517 ExifRational r;
1518 ExifByteOrder o;
1519
1520 /* We need the byte order */
1521 if (!e || !e->parent || e->data || !e->parent->parent)
1522 return;
1523 o = exif_data_get_byte_order (e->parent->parent);
1524
1525 e->tag = tag;
1526
1527 if(exif_entry_get_ifd(e) == EXIF_IFD_GPS) {
1528 exif_entry_initialize_gps(e, tag);
1529 return;
1530 }
1531
1532 switch (tag) {
1533
1534 /* LONG, 1 component, no default */
1535 case EXIF_TAG_PIXEL_X_DIMENSION:
1536 case EXIF_TAG_PIXEL_Y_DIMENSION:
1537 case EXIF_TAG_EXIF_IFD_POINTER:
1538 case EXIF_TAG_GPS_INFO_IFD_POINTER:
1539 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
1540 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
1541 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
1542 case EXIF_TAG_RECOMMENDED_EXPOSURE_INDEX:
1543 case EXIF_TAG_STANDARD_OUTPUT_SENSITIVITY:
1544 case EXIF_TAG_ROWS_PER_STRIP:
1545 case EXIF_TAG_STRIP_BYTE_COUNTS:
1546 case EXIF_TAG_JPEG_PROC:
1547 case EXIF_TAG_ISO_SPEED_LATITUDE_YYY:
1548 case EXIF_TAG_ISO_SPEED_LATITUDE_ZZZ:
1549 case EXIF_TAG_ISO_SPEED:
1550 case EXIF_TAG_STRIP_OFFSETS:
1551 e->components = 1;
1552 e->format = EXIF_FORMAT_LONG;
1553 e->size = exif_format_get_size (e->format) * e->components;
1554 e->data = exif_entry_alloc (e, e->size);
1555 if (!e->data) { clear_entry(e); break; }
1556 break;
1557
1558 /* LONG, 2 components, default 0 0 */
1559 case EXIF_TAG_DEFALUT_CROP_SIZE:
1560 e->components = 2;
1561 e->format = EXIF_FORMAT_LONG;
1562 e->size = exif_format_get_size (e->format) * e->components;
1563 e->data = exif_entry_alloc (e, e->size);
1564 if (!e->data) { clear_entry(e); break; }
1565 exif_set_long (e->data, o, 0);
1566 exif_set_long (
1567 e->data + exif_format_get_size (e->format),
1568 o, 0);
1569 break;
1570
1571 /* SHORT, 1 component, no default */
1572 case EXIF_TAG_SENSING_METHOD:
1573 case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
1574 case EXIF_TAG_COMPRESSION:
1575 case EXIF_TAG_EXPOSURE_MODE:
1576 case EXIF_TAG_WHITE_BALANCE:
1577 case EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM:
1578 case EXIF_TAG_GAIN_CONTROL:
1579 case EXIF_TAG_SUBJECT_DISTANCE_RANGE:
1580 case EXIF_TAG_FLASH:
1581 case EXIF_TAG_ISO_SPEED_RATINGS:
1582 case EXIF_TAG_SENSITIVITY_TYPE:
1583 case EXIF_TAG_NEW_SUBFILE_TYPE:
1584 case EXIF_TAG_OLD_SUBFILE_TYPE:
1585 case EXIF_TAG_COMPOSITE_IMAGE:
1586
1587 /* SHORT, 1 component, default 0 */
1588 case EXIF_TAG_IMAGE_WIDTH:
1589 case EXIF_TAG_IMAGE_LENGTH:
1590 case EXIF_TAG_EXPOSURE_PROGRAM:
1591 case EXIF_TAG_LIGHT_SOURCE:
1592 case EXIF_TAG_METERING_MODE:
1593 case EXIF_TAG_CUSTOM_RENDERED:
1594 case EXIF_TAG_SCENE_CAPTURE_TYPE:
1595 case EXIF_TAG_CONTRAST:
1596 case EXIF_TAG_SATURATION:
1597 case EXIF_TAG_SHARPNESS:
1598 e->components = 1;
1599 e->format = EXIF_FORMAT_SHORT;
1600 e->size = exif_format_get_size (e->format) * e->components;
1601 e->data = exif_entry_alloc (e, e->size);
1602 if (!e->data) { clear_entry(e); break; }
1603 exif_set_short (e->data, o, 0);
1604 break;
1605
1606 /* SHORT, 1 component, default 1 */
1607 case EXIF_TAG_ORIENTATION:
1608 case EXIF_TAG_PLANAR_CONFIGURATION:
1609 case EXIF_TAG_YCBCR_POSITIONING:
1610 e->components = 1;
1611 e->format = EXIF_FORMAT_SHORT;
1612 e->size = exif_format_get_size (e->format) * e->components;
1613 e->data = exif_entry_alloc (e, e->size);
1614 if (!e->data) { clear_entry(e); break; }
1615 exif_set_short (e->data, o, 1);
1616 break;
1617
1618 /* SHORT, 1 component, default 2 */
1619 case EXIF_TAG_RESOLUTION_UNIT:
1620 case EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT:
1621 e->components = 1;
1622 e->format = EXIF_FORMAT_SHORT;
1623 e->size = exif_format_get_size (e->format) * e->components;
1624 e->data = exif_entry_alloc (e, e->size);
1625 if (!e->data) { clear_entry(e); break; }
1626 exif_set_short (e->data, o, 2);
1627 break;
1628
1629 /* SHORT, 1 component, default 3 */
1630 case EXIF_TAG_SAMPLES_PER_PIXEL:
1631 e->components = 1;
1632 e->format = EXIF_FORMAT_SHORT;
1633 e->size = exif_format_get_size (e->format) * e->components;
1634 e->data = exif_entry_alloc (e, e->size);
1635 if (!e->data) { clear_entry(e); break; }
1636 exif_set_short (e->data, o, 3);
1637 break;
1638
1639 /* SHORT, 1 component, default 0xffff */
1640 case EXIF_TAG_COLOR_SPACE:
1641 e->components = 1;
1642 e->format = EXIF_FORMAT_SHORT;
1643 e->size = exif_format_get_size (e->format) * e->components;
1644 e->data = exif_entry_alloc (e, e->size);
1645 if (!e->data) { clear_entry(e); break; }
1646 exif_set_short (e->data, o, 0xffff);
1647 break;
1648
1649 /* SHORT, 2 components, default 0 0 */
1650 case EXIF_TAG_SUBJECT_LOCATION:
1651 case EXIF_TAG_SUBJECT_AREA:
1652 e->components = 2;
1653 e->format = EXIF_FORMAT_SHORT;
1654 e->size = exif_format_get_size(e->format) * e->components;
1655 e->data = exif_entry_alloc(e, e->size);
1656 if (!e->data) { clear_entry(e); break; }
1657 exif_set_short(e->data, o, 0);
1658 exif_set_short(
1659 e->data + exif_format_get_size(e->format),
1660 o, 0);
1661 break;
1662
1663 /* SHORT, 3 components, default 8 8 8 */
1664 case EXIF_TAG_BITS_PER_SAMPLE:
1665 e->components = 3;
1666 e->format = EXIF_FORMAT_SHORT;
1667 e->size = exif_format_get_size (e->format) * e->components;
1668 e->data = exif_entry_alloc (e, e->size);
1669 if (!e->data) { clear_entry(e); break; }
1670 exif_set_short (e->data, o, 8);
1671 exif_set_short (
1672 e->data + exif_format_get_size (e->format),
1673 o, 8);
1674 exif_set_short (
1675 e->data + 2 * exif_format_get_size (e->format),
1676 o, 8);
1677 break;
1678
1679 /* SHORT, 4 components, default 0 0 0 1 */
1680 case EXIF_TAG_DNG_VERSION:
1681 e->components = 4;
1682 e->format = EXIF_FORMAT_SHORT;
1683 e->size = exif_format_get_size (e->format) * e->components;
1684 e->data = exif_entry_alloc (e, e->size);
1685 if (!e->data) { clear_entry(e); break; }
1686 exif_set_short (e->data, o, 0);
1687 exif_set_short (
1688 e->data + exif_format_get_size (e->format),
1689 o, 0);
1690 exif_set_short (
1691 e->data + 2 * exif_format_get_size (e->format),
1692 o, 0);
1693 exif_set_short(
1694 e->data + 3 * exif_format_get_size(e->format),
1695 o, 1);
1696 break;
1697
1698 /* SHORT, 2 components, default 2 1 */
1699 case EXIF_TAG_YCBCR_SUB_SAMPLING:
1700 case EXIF_TAG_SOURCE_IMAGE_NUMBER_OF_COMPOSITE_IMAGE:
1701 e->components = 2;
1702 e->format = EXIF_FORMAT_SHORT;
1703 e->size = exif_format_get_size (e->format) * e->components;
1704 e->data = exif_entry_alloc (e, e->size);
1705 if (!e->data) { clear_entry(e); break; }
1706 exif_set_short (e->data, o, 2);
1707 exif_set_short (
1708 e->data + exif_format_get_size (e->format),
1709 o, 1);
1710 break;
1711
1712 /* SRATIONAL, 1 component, no default */
1713 case EXIF_TAG_EXPOSURE_BIAS_VALUE:
1714 case EXIF_TAG_BRIGHTNESS_VALUE:
1715 case EXIF_TAG_SHUTTER_SPEED_VALUE:
1716 e->components = 1;
1717 e->format = EXIF_FORMAT_SRATIONAL;
1718 e->size = exif_format_get_size (e->format) * e->components;
1719 e->data = exif_entry_alloc (e, e->size);
1720 if (!e->data) { clear_entry(e); break; }
1721 break;
1722
1723 /* RATIONAL, 1 component, no default */
1724 case EXIF_TAG_EXPOSURE_TIME:
1725 case EXIF_TAG_FOCAL_PLANE_X_RESOLUTION:
1726 case EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION:
1727 case EXIF_TAG_EXPOSURE_INDEX:
1728 case EXIF_TAG_FLASH_ENERGY:
1729 case EXIF_TAG_FNUMBER:
1730 case EXIF_TAG_FOCAL_LENGTH:
1731 case EXIF_TAG_SUBJECT_DISTANCE:
1732 case EXIF_TAG_MAX_APERTURE_VALUE:
1733 case EXIF_TAG_APERTURE_VALUE:
1734 case EXIF_TAG_COMPRESSED_BITS_PER_PIXEL:
1735 case EXIF_TAG_PRIMARY_CHROMATICITIES:
1736 case EXIF_TAG_DIGITAL_ZOOM_RATIO:
1737 case EXIF_TAG_GAMMA:
1738 e->components = 1;
1739 e->format = EXIF_FORMAT_RATIONAL;
1740 e->size = exif_format_get_size (e->format) * e->components;
1741 e->data = exif_entry_alloc (e, e->size);
1742 if (!e->data) { clear_entry(e); break; }
1743 break;
1744
1745 /* RATIONAL, 1 component, default 72/1 */
1746 case EXIF_TAG_X_RESOLUTION:
1747 case EXIF_TAG_Y_RESOLUTION:
1748 e->components = 1;
1749 e->format = EXIF_FORMAT_RATIONAL;
1750 e->size = exif_format_get_size (e->format) * e->components;
1751 e->data = exif_entry_alloc (e, e->size);
1752 if (!e->data) { clear_entry(e); break; }
1753 r.numerator = 72;
1754 r.denominator = 1;
1755 exif_set_rational (e->data, o, r);
1756 break;
1757
1758 /* RATIONAL, 2 components, no default */
1759 case EXIF_TAG_WHITE_POINT:
1760 e->components = 2;
1761 e->format = EXIF_FORMAT_RATIONAL;
1762 e->size = exif_format_get_size (e->format) * e->components;
1763 e->data = exif_entry_alloc (e, e->size);
1764 if (!e->data) { clear_entry(e); break; }
1765 break;
1766
1767 /* RATIONAL, 3 components, no default */
1768 case EXIF_TAG_YCBCR_COEFFICIENTS:
1769 e->components = 3;
1770 e->format = EXIF_FORMAT_RATIONAL;
1771 e->size = exif_format_get_size(e->format) * e->components;
1772 e->data = exif_entry_alloc(e, e->size);
1773 if (!e->data) { clear_entry(e); break; }
1774 break;
1775
1776 /* RATIONAL, 4 components, no default */
1777 case EXIF_TAG_LENS_SPECIFICATION:
1778 e->components = 4;
1779 e->format = EXIF_FORMAT_RATIONAL;
1780 e->size = exif_format_get_size(e->format) * e->components;
1781 e->data = exif_entry_alloc(e, e->size);
1782 if (!e->data) { clear_entry(e); break; }
1783 break;
1784
1785 /* RATIONAL, 6 components */
1786 case EXIF_TAG_REFERENCE_BLACK_WHITE:
1787 e->components = 6;
1788 e->format = EXIF_FORMAT_RATIONAL;
1789 e->size = exif_format_get_size (e->format) * e->components;
1790 e->data = exif_entry_alloc (e, e->size);
1791 if (!e->data) { clear_entry(e); break; }
1792 r.denominator = 1;
1793 r.numerator = 0;
1794 exif_set_rational (e->data, o, r);
1795 r.numerator = 255;
1796 exif_set_rational (
1797 e->data + exif_format_get_size (e->format), o, r);
1798 r.numerator = 0;
1799 exif_set_rational (
1800 e->data + 2 * exif_format_get_size (e->format), o, r);
1801 r.numerator = 255;
1802 exif_set_rational (
1803 e->data + 3 * exif_format_get_size (e->format), o, r);
1804 r.numerator = 0;
1805 exif_set_rational (
1806 e->data + 4 * exif_format_get_size (e->format), o, r);
1807 r.numerator = 255;
1808 exif_set_rational (
1809 e->data + 5 * exif_format_get_size (e->format), o, r);
1810 break;
1811
1812 /* ASCII, 20 components */
1813 case EXIF_TAG_DATE_TIME:
1814 case EXIF_TAG_DATE_TIME_ORIGINAL:
1815 case EXIF_TAG_DATE_TIME_DIGITIZED:
1816 {
1817 time_t t;
1818 #if defined(HAVE_LOCALTIME_R) || defined(HAVE_LOCALTIME_S)
1819 struct tm tms;
1820 #endif
1821 struct tm *tm;
1822
1823 t = time (NULL);
1824 #ifdef HAVE_LOCALTIME_R
1825 tm = localtime_r (&t, &tms);
1826 #elif defined(HAVE_LOCALTIME_S)
1827 localtime_s (&tms, &t);
1828 tm = &tms;
1829 #else
1830 tm = localtime (&t);
1831 #endif
1832 e->components = 20;
1833 e->format = EXIF_FORMAT_ASCII;
1834 e->size = exif_format_get_size (e->format) * e->components;
1835 e->data = exif_entry_alloc (e, e->size);
1836 if (!e->data) { clear_entry(e); break; }
1837 snprintf ((char *) e->data, e->size,
1838 "%04i:%02i:%02i %02i:%02i:%02i",
1839 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1840 tm->tm_hour, tm->tm_min, tm->tm_sec);
1841 break;
1842 }
1843
1844 /* ASCII, no default */
1845 case EXIF_TAG_SUB_SEC_TIME:
1846 case EXIF_TAG_SUB_SEC_TIME_ORIGINAL:
1847 case EXIF_TAG_SUB_SEC_TIME_DIGITIZED:
1848 case EXIF_TAG_IMAGE_UNIQUE_ID:
1849 case EXIF_TAG_RELATED_SOUND_FILE:
1850 case EXIF_TAG_LENS_MAKE:
1851 case EXIF_TAG_LENS_MODEL:
1852 case EXIF_TAG_LENS_SERIAL_NUMBER:
1853 case EXIF_TAG_OFFSET_TIME_DIGITIZED:
1854 case EXIF_TAG_OFFSET_TIME_ORIGINAL:
1855 case EXIF_TAG_OFFSET_TIME:
1856 case EXIF_TAG_CAMERA_OWNER_NAME:
1857 case EXIF_TAG_BODY_SERIAL_NUMBER:
1858 case EXIF_TAG_SPECTRAL_SENSITIVITY:
1859 e->components = 0;
1860 e->format = EXIF_FORMAT_ASCII;
1861 e->size = 0;
1862 e->data = NULL;
1863 break;
1864
1865 /* ASCII, default "[None]" */
1866 case EXIF_TAG_IMAGE_DESCRIPTION:
1867 case EXIF_TAG_MAKE:
1868 case EXIF_TAG_MODEL:
1869 case EXIF_TAG_SOFTWARE:
1870 case EXIF_TAG_ARTIST:
1871 e->components = strlen (_("[None]")) + 1;
1872 e->format = EXIF_FORMAT_ASCII;
1873 e->size = exif_format_get_size (e->format) * e->components;
1874 e->data = exif_entry_alloc (e, e->size);
1875 if (!e->data) { clear_entry(e); break; }
1876 strncpy ((char *)e->data, _("[None]"), e->size);
1877 break;
1878 /* ASCII, default "[None]\0[None]\0" */
1879 case EXIF_TAG_COPYRIGHT:
1880 e->components = (strlen (_("[None]")) + 1) * 2;
1881 e->format = EXIF_FORMAT_ASCII;
1882 e->size = exif_format_get_size (e->format) * e->components;
1883 e->data = exif_entry_alloc (e, e->size);
1884 if (!e->data) { clear_entry(e); break; }
1885 strcpy (((char *)e->data) + 0, _("[None]"));
1886 strcpy (((char *)e->data) + strlen (_("[None]")) + 1, _("[None]"));
1887 break;
1888
1889 /* UNDEFINED, 1 component, default 1 */
1890 case EXIF_TAG_SCENE_TYPE:
1891 e->components = 1;
1892 e->format = EXIF_FORMAT_UNDEFINED;
1893 e->size = exif_format_get_size (e->format) * e->components;
1894 e->data = exif_entry_alloc (e, e->size);
1895 if (!e->data) { clear_entry(e); break; }
1896 e->data[0] = 0x01;
1897 break;
1898
1899 /* UNDEFINED, 1 component, default 3 */
1900 case EXIF_TAG_FILE_SOURCE:
1901 e->components = 1;
1902 e->format = EXIF_FORMAT_UNDEFINED;
1903 e->size = exif_format_get_size (e->format) * e->components;
1904 e->data = exif_entry_alloc (e, e->size);
1905 if (!e->data) { clear_entry(e); break; }
1906 e->data[0] = 0x03;
1907 break;
1908
1909 /* UNDEFINED, 4 components, default 48 49 48 48 */
1910 case EXIF_TAG_FLASH_PIX_VERSION:
1911 e->components = 4;
1912 e->format = EXIF_FORMAT_UNDEFINED;
1913 e->size = exif_format_get_size (e->format) * e->components;
1914 e->data = exif_entry_alloc (e, e->size);
1915 if (!e->data) { clear_entry(e); break; }
1916 memcpy (e->data, "0100", 4);
1917 break;
1918
1919 /* UNDEFINED, 4 components, default 48 50 49 48 */
1920 case EXIF_TAG_EXIF_VERSION:
1921 e->components = 4;
1922 e->format = EXIF_FORMAT_UNDEFINED;
1923 e->size = exif_format_get_size (e->format) * e->components;
1924 e->data = exif_entry_alloc (e, e->size);
1925 if (!e->data) { clear_entry(e); break; }
1926 memcpy (e->data, "0210", 4);
1927 break;
1928
1929 /* UNDEFINED, 4 components, default 1 2 3 0 */
1930 case EXIF_TAG_COMPONENTS_CONFIGURATION:
1931 e->components = 4;
1932 e->format = EXIF_FORMAT_UNDEFINED;
1933 e->size = exif_format_get_size (e->format) * e->components;
1934 e->data = exif_entry_alloc (e, e->size);
1935 if (!e->data) { clear_entry(e); break; }
1936 e->data[0] = 1;
1937 e->data[1] = 2;
1938 e->data[2] = 3;
1939 e->data[3] = 0;
1940 break;
1941
1942 /* UNDEFINED, no components, no default */
1943 /* Use this if the tag is otherwise unsupported */
1944 case EXIF_TAG_MAKER_NOTE:
1945 case EXIF_TAG_USER_COMMENT:
1946 case EXIF_TAG_SOURCE_EXPOSURE_TIMES_OF_COMPOSITE_IMAGE:
1947 default:
1948 e->components = 0;
1949 e->format = EXIF_FORMAT_UNDEFINED;
1950 e->size = 0;
1951 e->data = NULL;
1952 break;
1953 }
1954 }
1955