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 <ctype.h>
29 #include <stdlib.h>
30 #include <stdio.h>
31 #include <string.h>
32 #include <time.h>
33 #include <math.h>
34
35 #ifndef M_PI
36 #define M_PI 3.14159265358979323846
37 #endif
38
39 struct _ExifEntryPrivate
40 {
41 unsigned int ref_count;
42
43 ExifMem *mem;
44 };
45
46 /* This function is hidden in exif-data.c */
47 ExifLog *exif_data_get_log (ExifData *);
48
49 #ifndef NO_VERBOSE_TAG_STRINGS
50 static void
exif_entry_log(ExifEntry * e,ExifLogCode code,const char * format,...)51 exif_entry_log (ExifEntry *e, ExifLogCode code, const char *format, ...)
52 {
53 va_list args;
54 ExifLog *l = NULL;
55
56 if (e && e->parent && e->parent->parent)
57 l = exif_data_get_log (e->parent->parent);
58 va_start (args, format);
59 exif_logv (l, code, "ExifEntry", format, args);
60 va_end (args);
61 }
62 #else
63 #if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
64 #define exif_entry_log(...) do { } while (0)
65 #elif defined(__GNUC__)
66 #define exif_entry_log(x...) do { } while (0)
67 #else
68 #define exif_entry_log (void)
69 #endif
70 #endif
71
72 static void *
exif_entry_alloc(ExifEntry * e,unsigned int i)73 exif_entry_alloc (ExifEntry *e, unsigned int i)
74 {
75 void *d;
76 ExifLog *l = NULL;
77
78 if (!e || !e->priv || !i) return NULL;
79
80 d = exif_mem_alloc (e->priv->mem, i);
81 if (d) return d;
82
83 if (e->parent && e->parent->parent)
84 l = exif_data_get_log (e->parent->parent);
85 EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
86 return NULL;
87 }
88
89 static void *
exif_entry_realloc(ExifEntry * e,void * d_orig,unsigned int i)90 exif_entry_realloc (ExifEntry *e, void *d_orig, unsigned int i)
91 {
92 void *d;
93 ExifLog *l = NULL;
94
95 if (!e || !e->priv) return NULL;
96
97 if (!i) { exif_mem_free (e->priv->mem, d_orig); return NULL; }
98
99 d = exif_mem_realloc (e->priv->mem, d_orig, i);
100 if (d) return d;
101
102 if (e->parent && e->parent->parent)
103 l = exif_data_get_log (e->parent->parent);
104 EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
105 return NULL;
106 }
107
108 ExifEntry *
exif_entry_new(void)109 exif_entry_new (void)
110 {
111 ExifMem *mem = exif_mem_new_default ();
112 ExifEntry *e = exif_entry_new_mem (mem);
113
114 exif_mem_unref (mem);
115
116 return e;
117 }
118
119 ExifEntry *
exif_entry_new_mem(ExifMem * mem)120 exif_entry_new_mem (ExifMem *mem)
121 {
122 ExifEntry *e = NULL;
123
124 e = exif_mem_alloc (mem, sizeof (ExifEntry));
125 if (!e) return NULL;
126 e->priv = exif_mem_alloc (mem, sizeof (ExifEntryPrivate));
127 if (!e->priv) { exif_mem_free (mem, e); return NULL; }
128 e->priv->ref_count = 1;
129
130 e->priv->mem = mem;
131 exif_mem_ref (mem);
132
133 return e;
134 }
135
136 void
exif_entry_ref(ExifEntry * e)137 exif_entry_ref (ExifEntry *e)
138 {
139 if (!e) return;
140
141 e->priv->ref_count++;
142 }
143
144 void
exif_entry_unref(ExifEntry * e)145 exif_entry_unref (ExifEntry *e)
146 {
147 if (!e) return;
148
149 e->priv->ref_count--;
150 if (!e->priv->ref_count)
151 exif_entry_free (e);
152 }
153
154 void
exif_entry_free(ExifEntry * e)155 exif_entry_free (ExifEntry *e)
156 {
157 if (!e) return;
158
159 if (e->priv) {
160 ExifMem *mem = e->priv->mem;
161 if (e->data)
162 exif_mem_free (mem, e->data);
163 exif_mem_free (mem, e->priv);
164 exif_mem_free (mem, e);
165 exif_mem_unref (mem);
166 }
167 }
168
169 /*! Get a value and convert it to an ExifShort.
170 * \bug Not all types are converted that could be converted and no indication
171 * is made when that occurs
172 */
173 static inline ExifShort
exif_get_short_convert(const unsigned char * buf,ExifFormat format,ExifByteOrder order)174 exif_get_short_convert (const unsigned char *buf, ExifFormat format,
175 ExifByteOrder order)
176 {
177 switch (format) {
178 case EXIF_FORMAT_LONG:
179 return (ExifShort) exif_get_long (buf, order);
180 case EXIF_FORMAT_SLONG:
181 return (ExifShort) exif_get_slong (buf, order);
182 case EXIF_FORMAT_SHORT:
183 return (ExifShort) exif_get_short (buf, order);
184 case EXIF_FORMAT_SSHORT:
185 return (ExifShort) exif_get_sshort (buf, order);
186 case EXIF_FORMAT_BYTE:
187 case EXIF_FORMAT_SBYTE:
188 return (ExifShort) buf[0];
189 default:
190 /* Unsupported type */
191 return (ExifShort) 0;
192 }
193 }
194
195 void
exif_entry_fix(ExifEntry * e)196 exif_entry_fix (ExifEntry *e)
197 {
198 unsigned int i, newsize;
199 unsigned char *newdata;
200 ExifByteOrder o;
201 ExifRational r;
202 ExifSRational sr;
203
204 if (!e || !e->priv) return;
205
206 switch (e->tag) {
207
208 /* These tags all need to be of format SHORT. */
209 case EXIF_TAG_YCBCR_SUB_SAMPLING:
210 case EXIF_TAG_SUBJECT_AREA:
211 case EXIF_TAG_COLOR_SPACE:
212 case EXIF_TAG_PLANAR_CONFIGURATION:
213 case EXIF_TAG_SENSING_METHOD:
214 case EXIF_TAG_ORIENTATION:
215 case EXIF_TAG_YCBCR_POSITIONING:
216 case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
217 case EXIF_TAG_CUSTOM_RENDERED:
218 case EXIF_TAG_EXPOSURE_MODE:
219 case EXIF_TAG_WHITE_BALANCE:
220 case EXIF_TAG_SCENE_CAPTURE_TYPE:
221 case EXIF_TAG_GAIN_CONTROL:
222 case EXIF_TAG_SATURATION:
223 case EXIF_TAG_CONTRAST:
224 case EXIF_TAG_SHARPNESS:
225 case EXIF_TAG_ISO_SPEED_RATINGS:
226 switch (e->format) {
227 case EXIF_FORMAT_LONG:
228 case EXIF_FORMAT_SLONG:
229 case EXIF_FORMAT_BYTE:
230 case EXIF_FORMAT_SBYTE:
231 case EXIF_FORMAT_SSHORT:
232 if (!e->parent || !e->parent->parent) break;
233 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
234 _("Tag '%s' was of format '%s' (which is "
235 "against specification) and has been "
236 "changed to format '%s'."),
237 exif_tag_get_name_in_ifd(e->tag,
238 exif_entry_get_ifd(e)),
239 exif_format_get_name (e->format),
240 exif_format_get_name (EXIF_FORMAT_SHORT));
241
242 o = exif_data_get_byte_order (e->parent->parent);
243 newsize = e->components * exif_format_get_size (EXIF_FORMAT_SHORT);
244 newdata = exif_entry_alloc (e, newsize);
245 if (!newdata) {
246 exif_entry_log (e, EXIF_LOG_CODE_NO_MEMORY,
247 "Could not allocate %lu byte(s).", (unsigned long)newsize);
248 break;
249 }
250
251 for (i = 0; i < e->components; i++)
252 exif_set_short (
253 newdata + i *
254 exif_format_get_size (
255 EXIF_FORMAT_SHORT), o,
256 exif_get_short_convert (
257 e->data + i *
258 exif_format_get_size (e->format),
259 e->format, o));
260
261 exif_mem_free (e->priv->mem, e->data);
262 e->data = newdata;
263 e->size = newsize;
264 e->format = EXIF_FORMAT_SHORT;
265 break;
266 case EXIF_FORMAT_SHORT:
267 /* No conversion necessary */
268 break;
269 default:
270 exif_entry_log (e, EXIF_LOG_CODE_CORRUPT_DATA,
271 _("Tag '%s' is of format '%s' (which is "
272 "against specification) but cannot be changed "
273 "to format '%s'."),
274 exif_tag_get_name_in_ifd(e->tag,
275 exif_entry_get_ifd(e)),
276 exif_format_get_name (e->format),
277 exif_format_get_name (EXIF_FORMAT_SHORT));
278 break;
279 }
280 break;
281
282 /* All these tags need to be of format 'Rational'. */
283 case EXIF_TAG_FNUMBER:
284 case EXIF_TAG_APERTURE_VALUE:
285 case EXIF_TAG_EXPOSURE_TIME:
286 case EXIF_TAG_FOCAL_LENGTH:
287 switch (e->format) {
288 case EXIF_FORMAT_SRATIONAL:
289 if (!e->parent || !e->parent->parent) break;
290 o = exif_data_get_byte_order (e->parent->parent);
291 for (i = 0; i < e->components; i++) {
292 sr = exif_get_srational (e->data + i *
293 exif_format_get_size (
294 EXIF_FORMAT_SRATIONAL), o);
295 r.numerator = (ExifLong) sr.numerator;
296 r.denominator = (ExifLong) sr.denominator;
297 exif_set_rational (e->data + i *
298 exif_format_get_size (
299 EXIF_FORMAT_RATIONAL), o, r);
300 }
301 e->format = EXIF_FORMAT_RATIONAL;
302 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
303 _("Tag '%s' was of format '%s' (which is "
304 "against specification) and has been "
305 "changed to format '%s'."),
306 exif_tag_get_name_in_ifd(e->tag,
307 exif_entry_get_ifd(e)),
308 exif_format_get_name (EXIF_FORMAT_SRATIONAL),
309 exif_format_get_name (EXIF_FORMAT_RATIONAL));
310 break;
311 default:
312 break;
313 }
314 break;
315
316 /* All these tags need to be of format 'SRational'. */
317 case EXIF_TAG_EXPOSURE_BIAS_VALUE:
318 case EXIF_TAG_BRIGHTNESS_VALUE:
319 case EXIF_TAG_SHUTTER_SPEED_VALUE:
320 switch (e->format) {
321 case EXIF_FORMAT_RATIONAL:
322 if (!e->parent || !e->parent->parent) break;
323 o = exif_data_get_byte_order (e->parent->parent);
324 for (i = 0; i < e->components; i++) {
325 r = exif_get_rational (e->data + i *
326 exif_format_get_size (
327 EXIF_FORMAT_RATIONAL), o);
328 sr.numerator = (ExifLong) r.numerator;
329 sr.denominator = (ExifLong) r.denominator;
330 exif_set_srational (e->data + i *
331 exif_format_get_size (
332 EXIF_FORMAT_SRATIONAL), o, sr);
333 }
334 e->format = EXIF_FORMAT_SRATIONAL;
335 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
336 _("Tag '%s' was of format '%s' (which is "
337 "against specification) and has been "
338 "changed to format '%s'."),
339 exif_tag_get_name_in_ifd(e->tag,
340 exif_entry_get_ifd(e)),
341 exif_format_get_name (EXIF_FORMAT_RATIONAL),
342 exif_format_get_name (EXIF_FORMAT_SRATIONAL));
343 break;
344 default:
345 break;
346 }
347 break;
348
349 case EXIF_TAG_USER_COMMENT:
350
351 /* Format needs to be UNDEFINED. */
352 if (e->format != EXIF_FORMAT_UNDEFINED) {
353 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
354 _("Tag 'UserComment' had invalid format '%s'. "
355 "Format has been set to 'undefined'."),
356 exif_format_get_name (e->format));
357 e->format = EXIF_FORMAT_UNDEFINED;
358 }
359
360 /* Some packages like Canon ZoomBrowser EX 4.5 store
361 only one zero byte followed by 7 bytes of rubbish */
362 if ((e->size >= 8) && (e->data[0] == 0)) {
363 memcpy(e->data, "\0\0\0\0\0\0\0\0", 8);
364 }
365
366 /* There need to be at least 8 bytes. */
367 if (e->size < 8) {
368 e->data = exif_entry_realloc (e, e->data, 8 + e->size);
369 if (!e->data) {
370 e->size = 0;
371 e->components = 0;
372 return;
373 }
374
375 /* Assume ASCII */
376 memmove (e->data + 8, e->data, e->size);
377 memcpy (e->data, "ASCII\0\0\0", 8);
378 e->size += 8;
379 e->components += 8;
380 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
381 _("Tag 'UserComment' has been expanded to at "
382 "least 8 bytes in order to follow the "
383 "specification."));
384 break;
385 }
386
387 /*
388 * If the first 8 bytes are empty and real data starts
389 * afterwards, let's assume ASCII and claim the 8 first
390 * bytes for the format specifyer.
391 */
392 for (i = 0; (i < e->size) && !e->data[i]; i++);
393 if (!i) for ( ; (i < e->size) && (e->data[i] == ' '); i++);
394 if ((i >= 8) && (i < e->size)) {
395 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
396 _("Tag 'UserComment' is not empty but does not "
397 "start with a format identifier. "
398 "This has been fixed."));
399 memcpy (e->data, "ASCII\0\0\0", 8);
400 break;
401 }
402
403 /*
404 * First 8 bytes need to follow the specification. If they don't,
405 * assume ASCII.
406 */
407 if (memcmp (e->data, "ASCII\0\0\0" , 8) &&
408 memcmp (e->data, "UNICODE\0" , 8) &&
409 memcmp (e->data, "JIS\0\0\0\0\0" , 8) &&
410 memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)) {
411 e->data = exif_entry_realloc (e, e->data, 8 + e->size);
412 if (!e->data) {
413 e->size = 0;
414 e->components = 0;
415 break;
416 }
417
418 /* Assume ASCII */
419 memmove (e->data + 8, e->data, e->size);
420 memcpy (e->data, "ASCII\0\0\0", 8);
421 e->size += 8;
422 e->components += 8;
423 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
424 _("Tag 'UserComment' did not start with a "
425 "format identifier. This has been fixed."));
426 break;
427 }
428
429 break;
430 default:
431 break;
432 }
433 }
434
435 /*! Format the value of an ExifEntry for human display in a generic way.
436 * The output is localized. The formatting is independent of the tag number
437 * and is based entirely on the data type.
438 * \pre The ExifEntry is already a member of an ExifData.
439 * \param[in] e EXIF entry
440 * \param[out] val buffer in which to store value
441 * \param[in] maxlen one less than the length of the buffer val
442 */
443 static void
exif_entry_format_value(ExifEntry * e,char * val,size_t maxlen)444 exif_entry_format_value(ExifEntry *e, char *val, size_t maxlen)
445 {
446 ExifByte v_byte;
447 ExifShort v_short;
448 ExifSShort v_sshort;
449 ExifLong v_long;
450 ExifRational v_rat;
451 ExifSRational v_srat;
452 ExifSLong v_slong;
453 unsigned int i;
454 size_t len;
455 const ExifByteOrder o = exif_data_get_byte_order (e->parent->parent);
456
457 if (!e->size || !maxlen)
458 return;
459 ++maxlen; /* include the terminating NUL */
460 switch (e->format) {
461 case EXIF_FORMAT_UNDEFINED:
462 snprintf (val, maxlen, _("%i bytes undefined data"), e->size);
463 break;
464 case EXIF_FORMAT_BYTE:
465 case EXIF_FORMAT_SBYTE:
466 v_byte = e->data[0];
467 snprintf (val, maxlen, "0x%02x", v_byte);
468 len = strlen (val);
469 for (i = 1; i < e->components; i++) {
470 v_byte = e->data[i];
471 snprintf (val+len, maxlen-len, ", 0x%02x", v_byte);
472 len += strlen (val+len);
473 if (len >= maxlen-1) break;
474 }
475 break;
476 case EXIF_FORMAT_SHORT:
477 v_short = exif_get_short (e->data, o);
478 snprintf (val, maxlen, "%u", v_short);
479 len = strlen (val);
480 for (i = 1; i < e->components; i++) {
481 v_short = exif_get_short (e->data +
482 exif_format_get_size (e->format) * i, o);
483 snprintf (val+len, maxlen-len, ", %u", v_short);
484 len += strlen (val+len);
485 if (len >= maxlen-1) break;
486 }
487 break;
488 case EXIF_FORMAT_SSHORT:
489 v_sshort = exif_get_sshort (e->data, o);
490 snprintf (val, maxlen, "%i", v_sshort);
491 len = strlen (val);
492 for (i = 1; i < e->components; i++) {
493 v_sshort = exif_get_short (e->data +
494 exif_format_get_size (e->format) *
495 i, o);
496 snprintf (val+len, maxlen-len, ", %i", v_sshort);
497 len += strlen (val+len);
498 if (len >= maxlen-1) break;
499 }
500 break;
501 case EXIF_FORMAT_LONG:
502 v_long = exif_get_long (e->data, o);
503 snprintf (val, maxlen, "%lu", (unsigned long) v_long);
504 len = strlen (val);
505 for (i = 1; i < e->components; i++) {
506 v_long = exif_get_long (e->data +
507 exif_format_get_size (e->format) *
508 i, o);
509 snprintf (val+len, maxlen-len, ", %lu", (unsigned long) v_long);
510 len += strlen (val+len);
511 if (len >= maxlen-1) break;
512 }
513 break;
514 case EXIF_FORMAT_SLONG:
515 v_slong = exif_get_slong (e->data, o);
516 snprintf (val, maxlen, "%li", (long) v_slong);
517 len = strlen (val);
518 for (i = 1; i < e->components; i++) {
519 v_slong = exif_get_slong (e->data +
520 exif_format_get_size (e->format) * i, o);
521 snprintf (val+len, maxlen-len, ", %li", (long) v_slong);
522 len += strlen (val+len);
523 if (len >= maxlen-1) break;
524 }
525 break;
526 case EXIF_FORMAT_ASCII:
527 strncpy (val, (char *) e->data, MIN (maxlen-1, e->size));
528 val[MIN (maxlen-1, e->size)] = 0;
529 break;
530 case EXIF_FORMAT_RATIONAL:
531 len = 0;
532 for (i = 0; i < e->components; i++) {
533 if (i > 0) {
534 snprintf (val+len, maxlen-len, ", ");
535 len += strlen (val+len);
536 }
537 v_rat = exif_get_rational (
538 e->data + 8 * i, o);
539 if (v_rat.denominator) {
540 /*
541 * Choose the number of significant digits to
542 * display based on the size of the denominator.
543 * It is scaled so that denominators within the
544 * range 13..120 will show 2 decimal points.
545 */
546 int decimals = (int)(log10(v_rat.denominator)-0.08+1.0);
547 snprintf (val+len, maxlen-len, "%2.*f",
548 decimals,
549 (double) v_rat.numerator /
550 (double) v_rat.denominator);
551 } else
552 snprintf (val+len, maxlen-len, "%lu/%lu",
553 (unsigned long) v_rat.numerator,
554 (unsigned long) v_rat.denominator);
555 len += strlen (val+len);
556 if (len >= maxlen-1) break;
557 }
558 break;
559 case EXIF_FORMAT_SRATIONAL:
560 len = 0;
561 for (i = 0; i < e->components; i++) {
562 if (i > 0) {
563 snprintf (val+len, maxlen-len, ", ");
564 len += strlen (val+len);
565 }
566 v_srat = exif_get_srational (
567 e->data + 8 * i, o);
568 if (v_srat.denominator) {
569 int decimals = (int)(log10(fabs(v_srat.denominator))-0.08+1.0);
570 snprintf (val+len, maxlen-len, "%2.*f",
571 decimals,
572 (double) v_srat.numerator /
573 (double) v_srat.denominator);
574 } else
575 snprintf (val+len, maxlen-len, "%li/%li",
576 (long) v_srat.numerator,
577 (long) v_srat.denominator);
578 len += strlen (val+len);
579 if (len >= maxlen-1) break;
580 }
581 break;
582 case EXIF_FORMAT_DOUBLE:
583 case EXIF_FORMAT_FLOAT:
584 default:
585 snprintf (val, maxlen, _("%i bytes unsupported data type"),
586 e->size);
587 break;
588 }
589 }
590
591 void
exif_entry_dump(ExifEntry * e,unsigned int indent)592 exif_entry_dump (ExifEntry *e, unsigned int indent)
593 {
594 char buf[1024];
595 char value[1024];
596 unsigned int i;
597
598 for (i = 0; i < 2 * indent; i++)
599 buf[i] = ' ';
600 buf[i] = '\0';
601
602 if (!e)
603 return;
604
605 printf ("%sTag: 0x%x ('%s')\n", buf, e->tag,
606 exif_tag_get_name_in_ifd (e->tag, exif_entry_get_ifd(e)));
607 printf ("%s Format: %i ('%s')\n", buf, e->format,
608 exif_format_get_name (e->format));
609 printf ("%s Components: %i\n", buf, (int) e->components);
610 printf ("%s Size: %i\n", buf, e->size);
611 printf ("%s Value: %s\n", buf, exif_entry_get_value (e, value, sizeof(value)));
612 }
613
614 /*! Check if a string consists entirely of a single, repeated character.
615 * Up to first n bytes are checked.
616 *
617 * \param[in] data pointer of string to check
618 * \param[in] ch character to match
619 * \param[in] n maximum number of characters to match
620 *
621 * \return 0 if the string matches or is of zero length, nonzero otherwise
622 */
623 static int
match_repeated_char(const unsigned char * data,unsigned char ch,size_t n)624 match_repeated_char(const unsigned char *data, unsigned char ch, size_t n)
625 {
626 int i;
627 for (i=n; i; --i, ++data) {
628 if (*data == 0) {
629 i = 0; /* all bytes before NUL matched */
630 break;
631 }
632 if (*data != ch)
633 break;
634 }
635 return i;
636 }
637
638 #define CF(entry,target,v,maxlen) \
639 { \
640 if (entry->format != target) { \
641 exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA, \
642 _("The tag '%s' contains data of an invalid " \
643 "format ('%s', expected '%s')."), \
644 exif_tag_get_name (entry->tag), \
645 exif_format_get_name (entry->format), \
646 exif_format_get_name (target)); \
647 break; \
648 } \
649 }
650
651 #define CC(entry,target,v,maxlen) \
652 { \
653 if (entry->components != target) { \
654 exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA, \
655 _("The tag '%s' contains an invalid number of " \
656 "components (%i, expected %i)."), \
657 exif_tag_get_name (entry->tag), \
658 (int) entry->components, (int) target); \
659 break; \
660 } \
661 }
662
663 static const struct {
664 ExifTag tag;
665 const char *strings[10];
666 } list[] = {
667 #ifndef NO_VERBOSE_TAG_DATA
668 { EXIF_TAG_PLANAR_CONFIGURATION,
669 { N_("Chunky format"), N_("Planar format"), NULL}},
670 { EXIF_TAG_SENSING_METHOD,
671 { "", N_("Not defined"), N_("One-chip color area sensor"),
672 N_("Two-chip color area sensor"), N_("Three-chip color area sensor"),
673 N_("Color sequential area sensor"), "", N_("Trilinear sensor"),
674 N_("Color sequential linear sensor"), NULL}},
675 { EXIF_TAG_ORIENTATION,
676 { "", N_("Top-left"), N_("Top-right"), N_("Bottom-right"),
677 N_("Bottom-left"), N_("Left-top"), N_("Right-top"),
678 N_("Right-bottom"), N_("Left-bottom"), NULL}},
679 { EXIF_TAG_YCBCR_POSITIONING,
680 { "", N_("Centered"), N_("Co-sited"), NULL}},
681 { EXIF_TAG_PHOTOMETRIC_INTERPRETATION,
682 { N_("Reversed mono"), N_("Normal mono"), N_("RGB"), N_("Palette"), "",
683 N_("CMYK"), N_("YCbCr"), "", N_("CieLAB"), NULL}},
684 { EXIF_TAG_CUSTOM_RENDERED,
685 { N_("Normal process"), N_("Custom process"), NULL}},
686 { EXIF_TAG_EXPOSURE_MODE,
687 { N_("Auto exposure"), N_("Manual exposure"), N_("Auto bracket"), NULL}},
688 { EXIF_TAG_WHITE_BALANCE,
689 { N_("Auto white balance"), N_("Manual white balance"), NULL}},
690 { EXIF_TAG_SCENE_CAPTURE_TYPE,
691 { N_("Standard"), N_("Landscape"), N_("Portrait"),
692 N_("Night scene"), NULL}},
693 { EXIF_TAG_GAIN_CONTROL,
694 { N_("Normal"), N_("Low gain up"), N_("High gain up"),
695 N_("Low gain down"), N_("High gain down"), NULL}},
696 { EXIF_TAG_SATURATION,
697 { N_("Normal"), N_("Low saturation"), N_("High saturation"), NULL}},
698 { EXIF_TAG_CONTRAST , {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
699 { EXIF_TAG_SHARPNESS, {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
700 #endif
701 { 0, {NULL}}
702 };
703
704 static const struct {
705 ExifTag tag;
706 struct {
707 int index;
708 const char *values[4]; /*!< list of progressively shorter string
709 descriptions; the longest one that fits will be
710 selected */
711 } elem[25];
712 } list2[] = {
713 #ifndef NO_VERBOSE_TAG_DATA
714 { EXIF_TAG_METERING_MODE,
715 { { 0, {N_("Unknown"), NULL}},
716 { 1, {N_("Average"), N_("Avg"), NULL}},
717 { 2, {N_("Center-weighted average"), N_("Center-weight"), NULL}},
718 { 3, {N_("Spot"), NULL}},
719 { 4, {N_("Multi spot"), NULL}},
720 { 5, {N_("Pattern"), NULL}},
721 { 6, {N_("Partial"), NULL}},
722 {255, {N_("Other"), NULL}},
723 { 0, {NULL}}}},
724 { EXIF_TAG_COMPRESSION,
725 { {1, {N_("Uncompressed"), NULL}},
726 {5, {N_("LZW compression"), NULL}},
727 {6, {N_("JPEG compression"), NULL}},
728 {7, {N_("JPEG compression"), NULL}},
729 {8, {N_("Deflate/ZIP compression"), NULL}},
730 {32773, {N_("PackBits compression"), NULL}},
731 {0, {NULL}}}},
732 { EXIF_TAG_LIGHT_SOURCE,
733 { { 0, {N_("Unknown"), NULL}},
734 { 1, {N_("Daylight"), NULL}},
735 { 2, {N_("Fluorescent"), NULL}},
736 { 3, {N_("Tungsten incandescent light"), N_("Tungsten"), NULL}},
737 { 4, {N_("Flash"), NULL}},
738 { 9, {N_("Fine weather"), NULL}},
739 { 10, {N_("Cloudy weather"), N_("Cloudy"), NULL}},
740 { 11, {N_("Shade"), NULL}},
741 { 12, {N_("Daylight fluorescent"), NULL}},
742 { 13, {N_("Day white fluorescent"), NULL}},
743 { 14, {N_("Cool white fluorescent"), NULL}},
744 { 15, {N_("White fluorescent"), NULL}},
745 { 17, {N_("Standard light A"), NULL}},
746 { 18, {N_("Standard light B"), NULL}},
747 { 19, {N_("Standard light C"), NULL}},
748 { 20, {N_("D55"), NULL}},
749 { 21, {N_("D65"), NULL}},
750 { 22, {N_("D75"), NULL}},
751 { 24, {N_("ISO studio tungsten"),NULL}},
752 {255, {N_("Other"), NULL}},
753 { 0, {NULL}}}},
754 { EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT,
755 { {2, {N_("Inch"), N_("in"), NULL}},
756 {3, {N_("Centimeter"), N_("cm"), NULL}},
757 {0, {NULL}}}},
758 { EXIF_TAG_RESOLUTION_UNIT,
759 { {2, {N_("Inch"), N_("in"), NULL}},
760 {3, {N_("Centimeter"), N_("cm"), NULL}},
761 {0, {NULL}}}},
762 { EXIF_TAG_EXPOSURE_PROGRAM,
763 { {0, {N_("Not defined"), NULL}},
764 {1, {N_("Manual"), NULL}},
765 {2, {N_("Normal program"), N_("Normal"), NULL}},
766 {3, {N_("Aperture priority"), N_("Aperture"), NULL}},
767 {4, {N_("Shutter priority"),N_("Shutter"), NULL}},
768 {5, {N_("Creative program (biased toward depth of field)"),
769 N_("Creative"), NULL}},
770 {6, {N_("Creative program (biased toward fast shutter speed)"),
771 N_("Action"), NULL}},
772 {7, {N_("Portrait mode (for closeup photos with the background out "
773 "of focus)"), N_("Portrait"), NULL}},
774 {8, {N_("Landscape mode (for landscape photos with the background "
775 "in focus)"), N_("Landscape"), NULL}},
776 {0, {NULL}}}},
777 { EXIF_TAG_FLASH,
778 { {0x0000, {N_("Flash did not fire"), N_("No flash"), NULL}},
779 {0x0001, {N_("Flash fired"), N_("Flash"), N_("Yes"), NULL}},
780 {0x0005, {N_("Strobe return light not detected"), N_("Without strobe"),
781 NULL}},
782 {0x0007, {N_("Strobe return light detected"), N_("With strobe"), NULL}},
783 {0x0008, {N_("Flash did not fire"), NULL}}, /* Olympus E-330 */
784 {0x0009, {N_("Flash fired, compulsory flash mode"), NULL}},
785 {0x000d, {N_("Flash fired, compulsory flash mode, return light "
786 "not detected"), NULL}},
787 {0x000f, {N_("Flash fired, compulsory flash mode, return light "
788 "detected"), NULL}},
789 {0x0010, {N_("Flash did not fire, compulsory flash mode"), NULL}},
790 {0x0018, {N_("Flash did not fire, auto mode"), NULL}},
791 {0x0019, {N_("Flash fired, auto mode"), NULL}},
792 {0x001d, {N_("Flash fired, auto mode, return light not detected"),
793 NULL}},
794 {0x001f, {N_("Flash fired, auto mode, return light detected"), NULL}},
795 {0x0020, {N_("No flash function"),NULL}},
796 {0x0041, {N_("Flash fired, red-eye reduction mode"), NULL}},
797 {0x0045, {N_("Flash fired, red-eye reduction mode, return light "
798 "not detected"), NULL}},
799 {0x0047, {N_("Flash fired, red-eye reduction mode, return light "
800 "detected"), NULL}},
801 {0x0049, {N_("Flash fired, compulsory flash mode, red-eye reduction "
802 "mode"), NULL}},
803 {0x004d, {N_("Flash fired, compulsory flash mode, red-eye reduction "
804 "mode, return light not detected"), NULL}},
805 {0x004f, {N_("Flash fired, compulsory flash mode, red-eye reduction mode, "
806 "return light detected"), NULL}},
807 {0x0058, {N_("Flash did not fire, auto mode, red-eye reduction mode"), NULL}},
808 {0x0059, {N_("Flash fired, auto mode, red-eye reduction mode"), NULL}},
809 {0x005d, {N_("Flash fired, auto mode, return light not detected, "
810 "red-eye reduction mode"), NULL}},
811 {0x005f, {N_("Flash fired, auto mode, return light detected, "
812 "red-eye reduction mode"), NULL}},
813 {0x0000, {NULL}}}},
814 { EXIF_TAG_SUBJECT_DISTANCE_RANGE,
815 { {0, {N_("Unknown"), N_("?"), NULL}},
816 {1, {N_("Macro"), NULL}},
817 {2, {N_("Close view"), N_("Close"), NULL}},
818 {3, {N_("Distant view"), N_("Distant"), NULL}},
819 {0, {NULL}}}},
820 { EXIF_TAG_COLOR_SPACE,
821 { {1, {N_("sRGB"), NULL}},
822 {2, {N_("Adobe RGB"), NULL}},
823 {0xffff, {N_("Uncalibrated"), NULL}},
824 {0x0000, {NULL}}}},
825 #endif
826 {0, { { 0, {NULL}}} }
827 };
828
829 const char *
exif_entry_get_value(ExifEntry * e,char * val,unsigned int maxlen)830 exif_entry_get_value (ExifEntry *e, char *val, unsigned int maxlen)
831 {
832 unsigned int i, j, k;
833 ExifShort v_short, v_short2, v_short3, v_short4;
834 ExifByte v_byte;
835 ExifRational v_rat;
836 ExifSRational v_srat;
837 char b[64];
838 const char *c;
839 ExifByteOrder o;
840 double d;
841 ExifEntry *entry;
842 static const struct {
843 char label[5];
844 char major, minor;
845 } versions[] = {
846 {"0110", 1, 1},
847 {"0120", 1, 2},
848 {"0200", 2, 0},
849 {"0210", 2, 1},
850 {"0220", 2, 2},
851 {"0221", 2, 21},
852 {"0230", 2, 3},
853 {"" , 0, 0}
854 };
855
856 /* FIXME: This belongs to somewhere else. */
857 /* libexif should use the default system locale.
858 * If an application specifically requires UTF-8, then we
859 * must give the application a way to tell libexif that.
860 *
861 * bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
862 */
863 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
864
865 if (!e || !e->parent || !e->parent->parent || !maxlen)
866 return val;
867
868 /* make sure the returned string is zero terminated */
869 memset (val, 0, maxlen);
870 maxlen--;
871 memset (b, 0, sizeof (b));
872
873 /* We need the byte order */
874 o = exif_data_get_byte_order (e->parent->parent);
875
876 /* Sanity check */
877 if (e->size != e->components * exif_format_get_size (e->format)) {
878 snprintf (val, maxlen, _("Invalid size of entry (%i, "
879 "expected %li x %i)."), e->size, e->components,
880 exif_format_get_size (e->format));
881 return val;
882 }
883
884 switch (e->tag) {
885 case EXIF_TAG_USER_COMMENT:
886
887 /*
888 * The specification says UNDEFINED, but some
889 * manufacturers don't care and use ASCII. If this is the
890 * case here, only refuse to read it if there is no chance
891 * of finding readable data.
892 */
893 if ((e->format != EXIF_FORMAT_ASCII) ||
894 (e->size <= 8) ||
895 ( memcmp (e->data, "ASCII\0\0\0" , 8) &&
896 memcmp (e->data, "UNICODE\0" , 8) &&
897 memcmp (e->data, "JIS\0\0\0\0\0", 8) &&
898 memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)))
899 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
900
901 /*
902 * Note that, according to the specification (V2.1, p 40),
903 * the user comment field does not have to be
904 * NULL terminated.
905 */
906 if ((e->size >= 8) && !memcmp (e->data, "ASCII\0\0\0", 8)) {
907 strncpy (val, (char *) e->data + 8, MIN (e->size - 8, maxlen));
908 break;
909 }
910 if ((e->size >= 8) && !memcmp (e->data, "UNICODE\0", 8)) {
911 strncpy (val, _("Unsupported UNICODE string"), maxlen);
912 /* FIXME: use iconv to convert into the locale encoding.
913 * EXIF 2.2 implies (but does not say) that this encoding is
914 * UCS-2.
915 */
916 break;
917 }
918 if ((e->size >= 8) && !memcmp (e->data, "JIS\0\0\0\0\0", 8)) {
919 strncpy (val, _("Unsupported JIS string"), maxlen);
920 /* FIXME: use iconv to convert into the locale encoding */
921 break;
922 }
923
924 /* Check if there is really some information in the tag. */
925 for (i = 0; (i < e->size) &&
926 (!e->data[i] || (e->data[i] == ' ')); i++);
927 if (i == e->size) break;
928
929 /*
930 * If we reach this point, the tag does not
931 * comply with the standard but seems to contain data.
932 * Print as much as possible.
933 */
934 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
935 _("Tag UserComment contains data but is "
936 "against specification."));
937 for (j = 0; (i < e->size) && (j < maxlen); i++, j++) {
938 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
939 _("Byte at position %i: 0x%02x"), i, e->data[i]);
940 val[j] = isprint (e->data[i]) ? e->data[i] : '.';
941 }
942 break;
943
944 case EXIF_TAG_EXIF_VERSION:
945 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
946 CC (e, 4, val, maxlen);
947 strncpy (val, _("Unknown Exif Version"), maxlen);
948 for (i = 0; *versions[i].label; i++) {
949 if (!memcmp (e->data, versions[i].label, 4)) {
950 snprintf (val, maxlen,
951 _("Exif Version %d.%d"),
952 versions[i].major,
953 versions[i].minor);
954 break;
955 }
956 }
957 break;
958 case EXIF_TAG_FLASH_PIX_VERSION:
959 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
960 CC (e, 4, val, maxlen);
961 if (!memcmp (e->data, "0100", 4))
962 strncpy (val, _("FlashPix Version 1.0"), maxlen);
963 else if (!memcmp (e->data, "0101", 4))
964 strncpy (val, _("FlashPix Version 1.01"), maxlen);
965 else
966 strncpy (val, _("Unknown FlashPix Version"), maxlen);
967 break;
968 case EXIF_TAG_COPYRIGHT:
969 CF (e, EXIF_FORMAT_ASCII, val, maxlen);
970
971 /*
972 * First part: Photographer.
973 * Some cameras store a string like " " here. Ignore it.
974 * Remember that a corrupted tag might not be NUL-terminated
975 */
976 if (e->size && e->data && match_repeated_char(e->data, ' ', e->size))
977 strncpy (val, (char *) e->data, MIN (maxlen, e->size));
978 else
979 strncpy (val, _("[None]"), maxlen);
980 strncat (val, " ", maxlen - strlen (val));
981 strncat (val, _("(Photographer)"), maxlen - strlen (val));
982
983 /* Second part: Editor. */
984 strncat (val, " - ", maxlen - strlen (val));
985 k = 0;
986 if (e->size && e->data) {
987 const unsigned char *tagdata = memchr(e->data, 0, e->size);
988 if (tagdata++) {
989 int editor_ofs = tagdata - e->data;
990 int remaining = e->size - editor_ofs;
991 if (match_repeated_char(tagdata, ' ', remaining)) {
992 strncat (val, (const char*)tagdata, MIN (maxlen - strlen (val), (size_t)remaining));
993 ++k;
994 }
995 }
996 }
997 if (!k)
998 strncat (val, _("[None]"), maxlen - strlen (val));
999 strncat (val, " ", maxlen - strlen (val));
1000 strncat (val, _("(Editor)"), maxlen - strlen (val));
1001
1002 break;
1003 case EXIF_TAG_FNUMBER:
1004 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1005 CC (e, 1, val, maxlen);
1006 v_rat = exif_get_rational (e->data, o);
1007 if (!v_rat.denominator) {
1008 exif_entry_format_value(e, val, maxlen);
1009 break;
1010 }
1011 d = (double) v_rat.numerator / (double) v_rat.denominator;
1012 snprintf (val, maxlen, "f/%.01f", d);
1013 break;
1014 case EXIF_TAG_APERTURE_VALUE:
1015 case EXIF_TAG_MAX_APERTURE_VALUE:
1016 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1017 CC (e, 1, val, maxlen);
1018 v_rat = exif_get_rational (e->data, o);
1019 if (!v_rat.denominator || (0x80000000 == v_rat.numerator)) {
1020 exif_entry_format_value(e, val, maxlen);
1021 break;
1022 }
1023 d = (double) v_rat.numerator / (double) v_rat.denominator;
1024 snprintf (val, maxlen, _("%.02f EV"), d);
1025 snprintf (b, sizeof (b), _(" (f/%.01f)"), pow (2, d / 2.));
1026 if (maxlen > strlen (val) + strlen (b))
1027 strncat (val, b, maxlen - strlen (val));
1028 break;
1029 case EXIF_TAG_FOCAL_LENGTH:
1030 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1031 CC (e, 1, val, maxlen);
1032 v_rat = exif_get_rational (e->data, o);
1033 if (!v_rat.denominator) {
1034 exif_entry_format_value(e, val, maxlen);
1035 break;
1036 }
1037
1038 /*
1039 * For calculation of the 35mm equivalent,
1040 * Minolta cameras need a multiplier that depends on the
1041 * camera model.
1042 */
1043 d = 0.;
1044 entry = exif_content_get_entry (
1045 e->parent->parent->ifd[EXIF_IFD_0], EXIF_TAG_MAKE);
1046 if (entry && entry->data &&
1047 !strncmp ((char *)entry->data, "Minolta", 7)) {
1048 entry = exif_content_get_entry (
1049 e->parent->parent->ifd[EXIF_IFD_0],
1050 EXIF_TAG_MODEL);
1051 if (entry && entry->data) {
1052 if (!strncmp ((char *)entry->data, "DiMAGE 7", 8))
1053 d = 3.9;
1054 else if (!strncmp ((char *)entry->data, "DiMAGE 5", 8))
1055 d = 4.9;
1056 }
1057 }
1058 if (d)
1059 snprintf (b, sizeof (b), _(" (35 equivalent: %d mm)"),
1060 (int) (d * (double) v_rat.numerator /
1061 (double) v_rat.denominator));
1062
1063 d = (double) v_rat.numerator / (double) v_rat.denominator;
1064 snprintf (val, maxlen, "%.1f mm", d);
1065 if (maxlen > strlen (val) + strlen (b))
1066 strncat (val, b, maxlen - strlen (val));
1067 break;
1068 case EXIF_TAG_SUBJECT_DISTANCE:
1069 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1070 CC (e, 1, val, maxlen);
1071 v_rat = exif_get_rational (e->data, o);
1072 if (!v_rat.denominator) {
1073 exif_entry_format_value(e, val, maxlen);
1074 break;
1075 }
1076 d = (double) v_rat.numerator / (double) v_rat.denominator;
1077 snprintf (val, maxlen, "%.1f m", d);
1078 break;
1079 case EXIF_TAG_EXPOSURE_TIME:
1080 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1081 CC (e, 1, val, maxlen);
1082 v_rat = exif_get_rational (e->data, o);
1083 if (!v_rat.denominator) {
1084 exif_entry_format_value(e, val, maxlen);
1085 break;
1086 }
1087 d = (double) v_rat.numerator / (double) v_rat.denominator;
1088 if (d < 1)
1089 snprintf (val, maxlen, _("1/%i"), (int) (0.5 + 1. / d));
1090 else
1091 snprintf (val, maxlen, "%i", (int) d);
1092 if (maxlen > strlen (val) + strlen (_(" sec.")))
1093 strncat (val, _(" sec."), maxlen - strlen (val));
1094 break;
1095 case EXIF_TAG_SHUTTER_SPEED_VALUE:
1096 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
1097 CC (e, 1, val, maxlen);
1098 v_srat = exif_get_srational (e->data, o);
1099 if (!v_srat.denominator) {
1100 exif_entry_format_value(e, val, maxlen);
1101 break;
1102 }
1103 d = (double) v_srat.numerator / (double) v_srat.denominator;
1104 snprintf (val, maxlen, _("%.02f EV"), d);
1105 d = 1. / pow (2, d);
1106 if (d < 1)
1107 snprintf (b, sizeof (b), _(" (1/%d sec.)"), (int) (1. / d));
1108 else
1109 snprintf (b, sizeof (b), _(" (%d sec.)"), (int) d);
1110 strncat (val, b, maxlen - strlen (val));
1111 break;
1112 case EXIF_TAG_BRIGHTNESS_VALUE:
1113 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
1114 CC (e, 1, val, maxlen);
1115 v_srat = exif_get_srational (e->data, o);
1116 if (!v_srat.denominator) {
1117 exif_entry_format_value(e, val, maxlen);
1118 break;
1119 }
1120 d = (double) v_srat.numerator / (double) v_srat.denominator;
1121 snprintf (val, maxlen, _("%.02f EV"), d);
1122 snprintf (b, sizeof (b), _(" (%.02f cd/m^2)"),
1123 1. / (M_PI * 0.3048 * 0.3048) * pow (2, d));
1124 if (maxlen > strlen (val) + strlen (b))
1125 strncat (val, b, maxlen - strlen (val));
1126 break;
1127 case EXIF_TAG_FILE_SOURCE:
1128 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
1129 CC (e, 1, val, maxlen);
1130 v_byte = e->data[0];
1131 if (v_byte == 3)
1132 strncpy (val, _("DSC"), maxlen);
1133 else
1134 snprintf (val, maxlen, _("Internal error (unknown "
1135 "value %i)"), v_byte);
1136 break;
1137 case EXIF_TAG_COMPONENTS_CONFIGURATION:
1138 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
1139 CC (e, 4, val, maxlen);
1140 for (i = 0; i < 4; i++) {
1141 switch (e->data[i]) {
1142 case 0: c = _("-"); break;
1143 case 1: c = _("Y"); break;
1144 case 2: c = _("Cb"); break;
1145 case 3: c = _("Cr"); break;
1146 case 4: c = _("R"); break;
1147 case 5: c = _("G"); break;
1148 case 6: c = _("B"); break;
1149 default: c = _("Reserved"); break;
1150 }
1151 strncat (val, c, maxlen - strlen (val));
1152 if (i < 3)
1153 strncat (val, " ", maxlen - strlen (val));
1154 }
1155 break;
1156 case EXIF_TAG_EXPOSURE_BIAS_VALUE:
1157 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
1158 CC (e, 1, val, maxlen);
1159 v_srat = exif_get_srational (e->data, o);
1160 if (!v_srat.denominator) {
1161 exif_entry_format_value(e, val, maxlen);
1162 break;
1163 }
1164 d = (double) v_srat.numerator / (double) v_srat.denominator;
1165 snprintf (val, maxlen, _("%.02f EV"), d);
1166 break;
1167 case EXIF_TAG_SCENE_TYPE:
1168 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
1169 CC (e, 1, val, maxlen);
1170 v_byte = e->data[0];
1171 if (v_byte == 1)
1172 strncpy (val, _("Directly photographed"), maxlen);
1173 else
1174 snprintf (val, maxlen, _("Internal error (unknown "
1175 "value %i)"), v_byte);
1176 break;
1177 case EXIF_TAG_YCBCR_SUB_SAMPLING:
1178 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
1179 CC (e, 2, val, maxlen);
1180 v_short = exif_get_short (e->data, o);
1181 v_short2 = exif_get_short (
1182 e->data + exif_format_get_size (e->format),
1183 o);
1184 if ((v_short == 2) && (v_short2 == 1))
1185 strncpy (val, _("YCbCr4:2:2"), maxlen);
1186 else if ((v_short == 2) && (v_short2 == 2))
1187 strncpy (val, _("YCbCr4:2:0"), maxlen);
1188 else
1189 snprintf (val, maxlen, "%u, %u", v_short, v_short2);
1190 break;
1191 case EXIF_TAG_SUBJECT_AREA:
1192 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
1193 switch (e->components) {
1194 case 2:
1195 v_short = exif_get_short (e->data, o);
1196 v_short2 = exif_get_short (e->data + 2, o);
1197 snprintf (val, maxlen, "(x,y) = (%i,%i)",
1198 v_short, v_short2);
1199 break;
1200 case 3:
1201 v_short = exif_get_short (e->data, o);
1202 v_short2 = exif_get_short (e->data + 2, o);
1203 v_short3 = exif_get_short (e->data + 4, o);
1204 snprintf (val, maxlen, _("Within distance %i of "
1205 "(x,y) = (%i,%i)"), v_short3, v_short,
1206 v_short2);
1207 break;
1208 case 4:
1209 v_short = exif_get_short (e->data, o);
1210 v_short2 = exif_get_short (e->data + 2, o);
1211 v_short3 = exif_get_short (e->data + 4, o);
1212 v_short4 = exif_get_short (e->data + 6, o);
1213 snprintf (val, maxlen, _("Within rectangle "
1214 "(width %i, height %i) around "
1215 "(x,y) = (%i,%i)"), v_short3, v_short4,
1216 v_short, v_short2);
1217 break;
1218 default:
1219 snprintf (val, maxlen, _("Unexpected number "
1220 "of components (%li, expected 2, 3, or 4)."),
1221 e->components);
1222 }
1223 break;
1224 case EXIF_TAG_GPS_VERSION_ID:
1225 /* This is only valid in the GPS IFD */
1226 CF (e, EXIF_FORMAT_BYTE, val, maxlen);
1227 CC (e, 4, val, maxlen);
1228 v_byte = e->data[0];
1229 snprintf (val, maxlen, "%u", v_byte);
1230 maxlen -= strlen (val);
1231 for (i = 1; i < e->components; i++) {
1232 v_byte = e->data[i];
1233 snprintf (b, sizeof (b), ".%u", v_byte);
1234 strncat (val, b, maxlen);
1235 maxlen -= strlen (b);
1236 if ((signed)maxlen <= 0) break;
1237 }
1238 break;
1239 case EXIF_TAG_INTEROPERABILITY_VERSION:
1240 /* a.k.a. case EXIF_TAG_GPS_LATITUDE: */
1241 /* This tag occurs in EXIF_IFD_INTEROPERABILITY */
1242 if (e->format == EXIF_FORMAT_UNDEFINED) {
1243 strncpy (val, (char *) e->data, MIN (maxlen, e->size));
1244 break;
1245 }
1246 /* EXIF_TAG_GPS_LATITUDE is the same numerically as
1247 * EXIF_TAG_INTEROPERABILITY_VERSION but in EXIF_IFD_GPS
1248 */
1249 exif_entry_format_value(e, val, maxlen);
1250 break;
1251 case EXIF_TAG_GPS_ALTITUDE_REF:
1252 /* This is only valid in the GPS IFD */
1253 CF (e, EXIF_FORMAT_BYTE, val, maxlen);
1254 CC (e, 1, val, maxlen);
1255 v_byte = e->data[0];
1256 if (v_byte == 0)
1257 strncpy (val, _("Sea level"), maxlen);
1258 else if (v_byte == 1)
1259 strncpy (val, _("Sea level reference"), maxlen);
1260 else
1261 snprintf (val, maxlen, _("Internal error (unknown "
1262 "value %i)"), v_byte);
1263 break;
1264 case EXIF_TAG_GPS_TIME_STAMP:
1265 /* This is only valid in the GPS IFD */
1266 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
1267 CC (e, 3, val, maxlen);
1268
1269 v_rat = exif_get_rational (e->data, o);
1270 if (!v_rat.denominator) {
1271 exif_entry_format_value(e, val, maxlen);
1272 break;
1273 }
1274 i = v_rat.numerator / v_rat.denominator;
1275
1276 v_rat = exif_get_rational (e->data +
1277 exif_format_get_size (e->format),
1278 o);
1279 if (!v_rat.denominator) {
1280 exif_entry_format_value(e, val, maxlen);
1281 break;
1282 }
1283 j = v_rat.numerator / v_rat.denominator;
1284
1285 v_rat = exif_get_rational (e->data +
1286 2*exif_format_get_size (e->format),
1287 o);
1288 if (!v_rat.denominator) {
1289 exif_entry_format_value(e, val, maxlen);
1290 break;
1291 }
1292 d = (double) v_rat.numerator / (double) v_rat.denominator;
1293 snprintf (val, maxlen, "%02u:%02u:%05.2f", i, j, d);
1294 break;
1295
1296 case EXIF_TAG_METERING_MODE:
1297 case EXIF_TAG_COMPRESSION:
1298 case EXIF_TAG_LIGHT_SOURCE:
1299 case EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT:
1300 case EXIF_TAG_RESOLUTION_UNIT:
1301 case EXIF_TAG_EXPOSURE_PROGRAM:
1302 case EXIF_TAG_FLASH:
1303 case EXIF_TAG_SUBJECT_DISTANCE_RANGE:
1304 case EXIF_TAG_COLOR_SPACE:
1305 CF (e,EXIF_FORMAT_SHORT, val, maxlen);
1306 CC (e, 1, val, maxlen);
1307 v_short = exif_get_short (e->data, o);
1308
1309 /* Search the tag */
1310 for (i = 0; list2[i].tag && (list2[i].tag != e->tag); i++);
1311 if (!list2[i].tag) {
1312 snprintf (val, maxlen, _("Internal error (unknown "
1313 "value %i)"), v_short);
1314 break;
1315 }
1316
1317 /* Find the value */
1318 for (j = 0; list2[i].elem[j].values[0] &&
1319 (list2[i].elem[j].index < v_short); j++);
1320 if (list2[i].elem[j].index != v_short) {
1321 snprintf (val, maxlen, _("Internal error (unknown "
1322 "value %i)"), v_short);
1323 break;
1324 }
1325
1326 /* Find a short enough value */
1327 memset (val, 0, maxlen);
1328 for (k = 0; list2[i].elem[j].values[k]; k++) {
1329 size_t l = strlen (_(list2[i].elem[j].values[k]));
1330 if ((maxlen > l) && (strlen (val) < l))
1331 strncpy (val, _(list2[i].elem[j].values[k]), maxlen);
1332 }
1333 if (!val[0]) snprintf (val, maxlen, "%i", v_short);
1334
1335 break;
1336
1337 case EXIF_TAG_PLANAR_CONFIGURATION:
1338 case EXIF_TAG_SENSING_METHOD:
1339 case EXIF_TAG_ORIENTATION:
1340 case EXIF_TAG_YCBCR_POSITIONING:
1341 case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
1342 case EXIF_TAG_CUSTOM_RENDERED:
1343 case EXIF_TAG_EXPOSURE_MODE:
1344 case EXIF_TAG_WHITE_BALANCE:
1345 case EXIF_TAG_SCENE_CAPTURE_TYPE:
1346 case EXIF_TAG_GAIN_CONTROL:
1347 case EXIF_TAG_SATURATION:
1348 case EXIF_TAG_CONTRAST:
1349 case EXIF_TAG_SHARPNESS:
1350 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
1351 CC (e, 1, val, maxlen);
1352 v_short = exif_get_short (e->data, o);
1353
1354 /* Search the tag */
1355 for (i = 0; list[i].tag && (list[i].tag != e->tag); i++);
1356 if (!list[i].tag) {
1357 snprintf (val, maxlen, _("Internal error (unknown "
1358 "value %i)"), v_short);
1359 break;
1360 }
1361
1362 /* Find the value */
1363 for (j = 0; list[i].strings[j] && (j < v_short); j++);
1364 if (!list[i].strings[j])
1365 snprintf (val, maxlen, "%i", v_short);
1366 else if (!*list[i].strings[j])
1367 snprintf (val, maxlen, _("Unknown value %i"), v_short);
1368 else
1369 strncpy (val, _(list[i].strings[j]), maxlen);
1370 break;
1371
1372 case EXIF_TAG_XP_TITLE:
1373 case EXIF_TAG_XP_COMMENT:
1374 case EXIF_TAG_XP_AUTHOR:
1375 case EXIF_TAG_XP_KEYWORDS:
1376 case EXIF_TAG_XP_SUBJECT:
1377 {
1378 /* Sanity check the size to prevent overflow */
1379 if (e->size+sizeof(unsigned short) < e->size) break;
1380
1381 /* The tag may not be U+0000-terminated , so make a local
1382 U+0000-terminated copy before converting it */
1383 unsigned short *utf16 = exif_mem_alloc (e->priv->mem, e->size+sizeof(unsigned short));
1384 if (!utf16) break;
1385 memcpy(utf16, e->data, e->size);
1386 utf16[e->size/sizeof(unsigned short)] = 0;
1387
1388 /* Warning! The texts are converted from UTF16 to UTF8 */
1389 /* FIXME: use iconv to convert into the locale encoding */
1390 exif_convert_utf16_to_utf8(val, utf16, maxlen);
1391 exif_mem_free(e->priv->mem, utf16);
1392 break;
1393 }
1394
1395 default:
1396 /* Use a generic value formatting */
1397 exif_entry_format_value(e, val, maxlen);
1398 }
1399
1400 return val;
1401 }
1402
1403
1404 /*!
1405 * \bug Log and report failed exif_mem_malloc() calls.
1406 */
1407 void
exif_entry_initialize(ExifEntry * e,ExifTag tag)1408 exif_entry_initialize (ExifEntry *e, ExifTag tag)
1409 {
1410 ExifRational r;
1411 ExifByteOrder o;
1412
1413 /* We need the byte order */
1414 if (!e || !e->parent || e->data || !e->parent->parent)
1415 return;
1416 o = exif_data_get_byte_order (e->parent->parent);
1417
1418 e->tag = tag;
1419 switch (tag) {
1420
1421 /* LONG, 1 component, no default */
1422 case EXIF_TAG_PIXEL_X_DIMENSION:
1423 case EXIF_TAG_PIXEL_Y_DIMENSION:
1424 case EXIF_TAG_EXIF_IFD_POINTER:
1425 case EXIF_TAG_GPS_INFO_IFD_POINTER:
1426 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
1427 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
1428 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
1429 e->components = 1;
1430 e->format = EXIF_FORMAT_LONG;
1431 e->size = exif_format_get_size (e->format) * e->components;
1432 e->data = exif_entry_alloc (e, e->size);
1433 if (!e->data) break;
1434 break;
1435
1436 /* SHORT, 1 component, no default */
1437 case EXIF_TAG_SUBJECT_LOCATION:
1438 case EXIF_TAG_SENSING_METHOD:
1439 case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
1440 case EXIF_TAG_COMPRESSION:
1441 case EXIF_TAG_EXPOSURE_MODE:
1442 case EXIF_TAG_WHITE_BALANCE:
1443 case EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM:
1444 case EXIF_TAG_GAIN_CONTROL:
1445 case EXIF_TAG_SUBJECT_DISTANCE_RANGE:
1446 case EXIF_TAG_FLASH:
1447 case EXIF_TAG_ISO_SPEED_RATINGS:
1448
1449 /* SHORT, 1 component, default 0 */
1450 case EXIF_TAG_IMAGE_WIDTH:
1451 case EXIF_TAG_IMAGE_LENGTH:
1452 case EXIF_TAG_EXPOSURE_PROGRAM:
1453 case EXIF_TAG_LIGHT_SOURCE:
1454 case EXIF_TAG_METERING_MODE:
1455 case EXIF_TAG_CUSTOM_RENDERED:
1456 case EXIF_TAG_SCENE_CAPTURE_TYPE:
1457 case EXIF_TAG_CONTRAST:
1458 case EXIF_TAG_SATURATION:
1459 case EXIF_TAG_SHARPNESS:
1460 e->components = 1;
1461 e->format = EXIF_FORMAT_SHORT;
1462 e->size = exif_format_get_size (e->format) * e->components;
1463 e->data = exif_entry_alloc (e, e->size);
1464 if (!e->data) break;
1465 exif_set_short (e->data, o, 0);
1466 break;
1467
1468 /* SHORT, 1 component, default 1 */
1469 case EXIF_TAG_ORIENTATION:
1470 case EXIF_TAG_PLANAR_CONFIGURATION:
1471 case EXIF_TAG_YCBCR_POSITIONING:
1472 e->components = 1;
1473 e->format = EXIF_FORMAT_SHORT;
1474 e->size = exif_format_get_size (e->format) * e->components;
1475 e->data = exif_entry_alloc (e, e->size);
1476 if (!e->data) break;
1477 exif_set_short (e->data, o, 1);
1478 break;
1479
1480 /* SHORT, 1 component, default 2 */
1481 case EXIF_TAG_RESOLUTION_UNIT:
1482 case EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT:
1483 e->components = 1;
1484 e->format = EXIF_FORMAT_SHORT;
1485 e->size = exif_format_get_size (e->format) * e->components;
1486 e->data = exif_entry_alloc (e, e->size);
1487 if (!e->data) break;
1488 exif_set_short (e->data, o, 2);
1489 break;
1490
1491 /* SHORT, 1 component, default 3 */
1492 case EXIF_TAG_SAMPLES_PER_PIXEL:
1493 e->components = 1;
1494 e->format = EXIF_FORMAT_SHORT;
1495 e->size = exif_format_get_size (e->format) * e->components;
1496 e->data = exif_entry_alloc (e, e->size);
1497 if (!e->data) break;
1498 exif_set_short (e->data, o, 3);
1499 break;
1500
1501 /* SHORT, 1 component, default 0xffff */
1502 case EXIF_TAG_COLOR_SPACE:
1503 e->components = 1;
1504 e->format = EXIF_FORMAT_SHORT;
1505 e->size = exif_format_get_size (e->format) * e->components;
1506 e->data = exif_entry_alloc (e, e->size);
1507 if (!e->data) break;
1508 exif_set_short (e->data, o, 0xffff);
1509 break;
1510
1511 /* SHORT, 3 components, default 8 8 8 */
1512 case EXIF_TAG_BITS_PER_SAMPLE:
1513 e->components = 3;
1514 e->format = EXIF_FORMAT_SHORT;
1515 e->size = exif_format_get_size (e->format) * e->components;
1516 e->data = exif_entry_alloc (e, e->size);
1517 if (!e->data) break;
1518 exif_set_short (e->data, o, 8);
1519 exif_set_short (
1520 e->data + exif_format_get_size (e->format),
1521 o, 8);
1522 exif_set_short (
1523 e->data + 2 * exif_format_get_size (e->format),
1524 o, 8);
1525 break;
1526
1527 /* SHORT, 2 components, default 2 1 */
1528 case EXIF_TAG_YCBCR_SUB_SAMPLING:
1529 e->components = 2;
1530 e->format = EXIF_FORMAT_SHORT;
1531 e->size = exif_format_get_size (e->format) * e->components;
1532 e->data = exif_entry_alloc (e, e->size);
1533 if (!e->data) break;
1534 exif_set_short (e->data, o, 2);
1535 exif_set_short (
1536 e->data + exif_format_get_size (e->format),
1537 o, 1);
1538 break;
1539
1540 /* SRATIONAL, 1 component, no default */
1541 case EXIF_TAG_EXPOSURE_BIAS_VALUE:
1542 case EXIF_TAG_BRIGHTNESS_VALUE:
1543 case EXIF_TAG_SHUTTER_SPEED_VALUE:
1544 e->components = 1;
1545 e->format = EXIF_FORMAT_SRATIONAL;
1546 e->size = exif_format_get_size (e->format) * e->components;
1547 e->data = exif_entry_alloc (e, e->size);
1548 if (!e->data) break;
1549 break;
1550
1551 /* RATIONAL, 1 component, no default */
1552 case EXIF_TAG_EXPOSURE_TIME:
1553 case EXIF_TAG_FOCAL_PLANE_X_RESOLUTION:
1554 case EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION:
1555 case EXIF_TAG_EXPOSURE_INDEX:
1556 case EXIF_TAG_FLASH_ENERGY:
1557 case EXIF_TAG_FNUMBER:
1558 case EXIF_TAG_FOCAL_LENGTH:
1559 case EXIF_TAG_SUBJECT_DISTANCE:
1560 case EXIF_TAG_MAX_APERTURE_VALUE:
1561 case EXIF_TAG_APERTURE_VALUE:
1562 case EXIF_TAG_COMPRESSED_BITS_PER_PIXEL:
1563 case EXIF_TAG_PRIMARY_CHROMATICITIES:
1564 case EXIF_TAG_DIGITAL_ZOOM_RATIO:
1565 e->components = 1;
1566 e->format = EXIF_FORMAT_RATIONAL;
1567 e->size = exif_format_get_size (e->format) * e->components;
1568 e->data = exif_entry_alloc (e, e->size);
1569 if (!e->data) break;
1570 break;
1571
1572 /* RATIONAL, 1 component, default 72/1 */
1573 case EXIF_TAG_X_RESOLUTION:
1574 case EXIF_TAG_Y_RESOLUTION:
1575 e->components = 1;
1576 e->format = EXIF_FORMAT_RATIONAL;
1577 e->size = exif_format_get_size (e->format) * e->components;
1578 e->data = exif_entry_alloc (e, e->size);
1579 if (!e->data) break;
1580 r.numerator = 72;
1581 r.denominator = 1;
1582 exif_set_rational (e->data, o, r);
1583 break;
1584
1585 /* RATIONAL, 2 components, no default */
1586 case EXIF_TAG_WHITE_POINT:
1587 e->components = 2;
1588 e->format = EXIF_FORMAT_RATIONAL;
1589 e->size = exif_format_get_size (e->format) * e->components;
1590 e->data = exif_entry_alloc (e, e->size);
1591 if (!e->data) break;
1592 break;
1593
1594 /* RATIONAL, 6 components */
1595 case EXIF_TAG_REFERENCE_BLACK_WHITE:
1596 e->components = 6;
1597 e->format = EXIF_FORMAT_RATIONAL;
1598 e->size = exif_format_get_size (e->format) * e->components;
1599 e->data = exif_entry_alloc (e, e->size);
1600 if (!e->data) break;
1601 r.denominator = 1;
1602 r.numerator = 0;
1603 exif_set_rational (e->data, o, r);
1604 r.numerator = 255;
1605 exif_set_rational (
1606 e->data + exif_format_get_size (e->format), o, r);
1607 r.numerator = 0;
1608 exif_set_rational (
1609 e->data + 2 * exif_format_get_size (e->format), o, r);
1610 r.numerator = 255;
1611 exif_set_rational (
1612 e->data + 3 * exif_format_get_size (e->format), o, r);
1613 r.numerator = 0;
1614 exif_set_rational (
1615 e->data + 4 * exif_format_get_size (e->format), o, r);
1616 r.numerator = 255;
1617 exif_set_rational (
1618 e->data + 5 * exif_format_get_size (e->format), o, r);
1619 break;
1620
1621 /* ASCII, 20 components */
1622 case EXIF_TAG_DATE_TIME:
1623 case EXIF_TAG_DATE_TIME_ORIGINAL:
1624 case EXIF_TAG_DATE_TIME_DIGITIZED:
1625 {
1626 time_t t;
1627 #ifdef HAVE_LOCALTIME_R
1628 struct tm tms;
1629 #endif
1630 struct tm *tm;
1631
1632 t = time (NULL);
1633 #ifdef HAVE_LOCALTIME_R
1634 tm = localtime_r (&t, &tms);
1635 #else
1636 tm = localtime (&t);
1637 #endif
1638 e->components = 20;
1639 e->format = EXIF_FORMAT_ASCII;
1640 e->size = exif_format_get_size (e->format) * e->components;
1641 e->data = exif_entry_alloc (e, e->size);
1642 if (!e->data) break;
1643 snprintf ((char *) e->data, e->size,
1644 "%04i:%02i:%02i %02i:%02i:%02i",
1645 tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1646 tm->tm_hour, tm->tm_min, tm->tm_sec);
1647 break;
1648 }
1649
1650 /* ASCII, no default */
1651 case EXIF_TAG_SUB_SEC_TIME:
1652 case EXIF_TAG_SUB_SEC_TIME_ORIGINAL:
1653 case EXIF_TAG_SUB_SEC_TIME_DIGITIZED:
1654 e->components = 0;
1655 e->format = EXIF_FORMAT_ASCII;
1656 e->size = 0;
1657 e->data = NULL;
1658 break;
1659
1660 /* ASCII, default "[None]" */
1661 case EXIF_TAG_IMAGE_DESCRIPTION:
1662 case EXIF_TAG_MAKE:
1663 case EXIF_TAG_MODEL:
1664 case EXIF_TAG_SOFTWARE:
1665 case EXIF_TAG_ARTIST:
1666 e->components = strlen (_("[None]")) + 1;
1667 e->format = EXIF_FORMAT_ASCII;
1668 e->size = exif_format_get_size (e->format) * e->components;
1669 e->data = exif_entry_alloc (e, e->size);
1670 if (!e->data) break;
1671 strncpy ((char *)e->data, _("[None]"), e->size);
1672 break;
1673 /* ASCII, default "[None]\0[None]\0" */
1674 case EXIF_TAG_COPYRIGHT:
1675 e->components = (strlen (_("[None]")) + 1) * 2;
1676 e->format = EXIF_FORMAT_ASCII;
1677 e->size = exif_format_get_size (e->format) * e->components;
1678 e->data = exif_entry_alloc (e, e->size);
1679 if (!e->data) break;
1680 strcpy (((char *)e->data) + 0, _("[None]"));
1681 strcpy (((char *)e->data) + strlen (_("[None]")) + 1, _("[None]"));
1682 break;
1683
1684 /* UNDEFINED, 1 component, default 1 */
1685 case EXIF_TAG_SCENE_TYPE:
1686 e->components = 1;
1687 e->format = EXIF_FORMAT_UNDEFINED;
1688 e->size = exif_format_get_size (e->format) * e->components;
1689 e->data = exif_entry_alloc (e, e->size);
1690 if (!e->data) break;
1691 e->data[0] = 0x01;
1692 break;
1693
1694 /* UNDEFINED, 1 component, default 3 */
1695 case EXIF_TAG_FILE_SOURCE:
1696 e->components = 1;
1697 e->format = EXIF_FORMAT_UNDEFINED;
1698 e->size = exif_format_get_size (e->format) * e->components;
1699 e->data = exif_entry_alloc (e, e->size);
1700 if (!e->data) break;
1701 e->data[0] = 0x03;
1702 break;
1703
1704 /* UNDEFINED, 4 components, default 48 49 48 48 */
1705 case EXIF_TAG_FLASH_PIX_VERSION:
1706 e->components = 4;
1707 e->format = EXIF_FORMAT_UNDEFINED;
1708 e->size = exif_format_get_size (e->format) * e->components;
1709 e->data = exif_entry_alloc (e, e->size);
1710 if (!e->data) break;
1711 memcpy (e->data, "0100", 4);
1712 break;
1713
1714 /* UNDEFINED, 4 components, default 48 50 49 48 */
1715 case EXIF_TAG_EXIF_VERSION:
1716 e->components = 4;
1717 e->format = EXIF_FORMAT_UNDEFINED;
1718 e->size = exif_format_get_size (e->format) * e->components;
1719 e->data = exif_entry_alloc (e, e->size);
1720 if (!e->data) break;
1721 memcpy (e->data, "0210", 4);
1722 break;
1723
1724 /* UNDEFINED, 4 components, default 1 2 3 0 */
1725 case EXIF_TAG_COMPONENTS_CONFIGURATION:
1726 e->components = 4;
1727 e->format = EXIF_FORMAT_UNDEFINED;
1728 e->size = exif_format_get_size (e->format) * e->components;
1729 e->data = exif_entry_alloc (e, e->size);
1730 if (!e->data) break;
1731 e->data[0] = 1;
1732 e->data[1] = 2;
1733 e->data[2] = 3;
1734 e->data[3] = 0;
1735 break;
1736
1737 /* UNDEFINED, no components, no default */
1738 /* Use this if the tag is otherwise unsupported */
1739 case EXIF_TAG_MAKER_NOTE:
1740 case EXIF_TAG_USER_COMMENT:
1741 default:
1742 e->components = 0;
1743 e->format = EXIF_FORMAT_UNDEFINED;
1744 e->size = 0;
1745 e->data = NULL;
1746 break;
1747 }
1748 }
1749