3 * Copyright © 2001 Lutz Müller <lutz@users.sourceforge.net>
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.
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.
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., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
23 #include <libexif/exif-mnote-data.h>
24 #include <libexif/exif-data.h>
25 #include <libexif/exif-ifd.h>
26 #include <libexif/exif-mnote-data-priv.h>
27 #include <libexif/exif-utils.h>
28 #include <libexif/exif-loader.h>
29 #include <libexif/exif-log.h>
30 #include <libexif/i18n.h>
31 #include <libexif/exif-system.h>
33 #include <libexif/olympus/exif-mnote-data-olympus.h>
34 #include <libexif/canon/exif-mnote-data-canon.h>
35 #include <libexif/pentax/exif-mnote-data-pentax.h>
41 #if defined(__WATCOMC__) || defined(_MSC_VER)
42 # define strncasecmp strnicmp
45 #undef JPEG_MARKER_SOI
46 #define JPEG_MARKER_SOI 0xd8
47 #undef JPEG_MARKER_APP0
48 #define JPEG_MARKER_APP0 0xe0
49 #undef JPEG_MARKER_APP1
50 #define JPEG_MARKER_APP1 0xe1
52 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
54 struct _ExifDataPrivate
63 unsigned int ref_count;
65 /* Temporarily used while loading data */
66 unsigned int offset_mnote;
68 ExifDataOption options;
69 ExifDataType data_type;
73 exif_data_alloc (ExifData *data, unsigned int i)
80 d = exif_mem_alloc (data->priv->mem, i);
84 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
89 exif_data_get_mnote_data (ExifData *d)
91 return (d && d->priv) ? d->priv->md : NULL;
97 ExifMem *mem = exif_mem_new_default ();
98 ExifData *d = exif_data_new_mem (mem);
100 exif_mem_unref (mem);
106 exif_data_new_mem (ExifMem *mem)
114 data = exif_mem_alloc (mem, sizeof (ExifData));
117 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
119 exif_mem_free (mem, data);
122 data->priv->ref_count = 1;
124 data->priv->mem = mem;
127 for (i = 0; i < EXIF_IFD_COUNT; i++) {
128 data->ifd[i] = exif_content_new_mem (data->priv->mem);
130 exif_data_free (data);
133 data->ifd[i]->parent = data;
136 /* Default options */
137 #ifndef NO_VERBOSE_TAG_STRINGS
139 * When the tag list is compiled away, setting this option prevents
140 * any tags from being loaded
142 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
144 exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
146 /* Default data type: none */
147 exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
153 exif_data_new_from_data (const unsigned char *data, unsigned int size)
157 edata = exif_data_new ();
158 exif_data_load_data (edata, data, size);
163 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
164 const unsigned char *d,
165 unsigned int size, unsigned int offset)
167 unsigned int s, doff;
169 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
170 entry->format = exif_get_short (d + offset + 2, data->priv->order);
171 entry->components = exif_get_long (d + offset + 4, data->priv->order);
173 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
174 "Loading entry 0x%x ('%s')...", entry->tag,
175 exif_tag_get_name (entry->tag));
177 /* {0,1,2,4,8} x { 0x00000000 .. 0xffffffff }
178 * -> { 0x000000000 .. 0x7fffffff8 } */
179 s = exif_format_get_size(entry->format) * entry->components;
180 if (s < entry->components) {
186 * Size? If bigger than 4 bytes, the actual data is not
187 * in the entry but somewhere else (offset).
190 doff = exif_get_long (d + offset + 8, data->priv->order);
195 if ((doff + s < doff) || (doff + s < s))
200 entry->data = exif_data_alloc (data, s);
203 memcpy (entry->data, d + doff, s);
205 /* FIXME: What do our callers do if (entry->data == NULL)? */
206 EXIF_LOG_NO_MEMORY(data->priv->log, "ExifData", s);
209 /* If this is the MakerNote, remember the offset */
210 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
212 exif_log (data->priv->log,
213 EXIF_LOG_CODE_DEBUG, "ExifData",
214 "MakerNote found with NULL data");
215 } else if (entry->size > 6) {
216 exif_log (data->priv->log,
217 EXIF_LOG_CODE_DEBUG, "ExifData",
218 "MakerNote found (%02x %02x %02x %02x "
219 "%02x %02x %02x...).",
220 entry->data[0], entry->data[1], entry->data[2],
221 entry->data[3], entry->data[4], entry->data[5],
224 data->priv->offset_mnote = doff;
230 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
231 unsigned char **d, unsigned int *ds,
234 unsigned int doff, s;
236 if (!data || !data->priv)
240 * Each entry is 12 bytes long. The memory for the entry has
241 * already been allocated.
243 exif_set_short (*d + 6 + offset + 0,
244 data->priv->order, (ExifShort) e->tag);
245 exif_set_short (*d + 6 + offset + 2,
246 data->priv->order, (ExifShort) e->format);
248 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
249 /* If this is the maker note tag, update it. */
250 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
251 exif_mem_free (data->priv->mem, e->data);
254 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
255 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
256 e->components = e->size;
260 exif_set_long (*d + 6 + offset + 4,
261 data->priv->order, e->components);
264 * Size? If bigger than 4 bytes, the actual data is not in
265 * the entry but somewhere else.
267 s = exif_format_get_size (e->format) * e->components;
273 * According to the TIFF specification,
274 * the offset must be an even number. If we need to introduce
275 * a padding byte, we set it to 0.
279 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
281 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
284 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
286 *(*d + *ds - 1) = '\0';
291 /* Write the data. Fill unneeded bytes with 0. */
292 memcpy (*d + 6 + doff, e->data, s);
294 memset (*d + 6 + doff + s, 0, (4 - s));
298 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
299 unsigned int ds, ExifLong offset, ExifLong size)
301 if (ds < offset + size) {
302 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
303 "Bogus thumbnail offset and size: %i < %i + %i.",
304 (int) ds, (int) offset, (int) size);
308 exif_mem_free (data->priv->mem, data->data);
310 data->data = exif_data_alloc (data, data->size);
313 memcpy (data->data, d + offset, data->size);
317 #define CHECK_REC(i) \
319 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
320 "ExifData", "Recursive entry in IFD " \
321 "'%s' detected. Skipping...", \
322 exif_ifd_get_name (i)); \
325 if (data->ifd[(i)]->count) { \
326 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
327 "ExifData", "Attempt to load IFD " \
328 "'%s' multiple times detected. " \
330 exif_ifd_get_name (i)); \
335 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
336 const unsigned char *d,
337 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
339 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
345 if (!data || !data->priv)
348 /* check for valid ExifIfd enum range */
349 if (( ((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
352 if (recursion_depth > 150) {
353 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
354 "Deep recursion detected!");
358 /* Read the number of entries */
359 if (offset >= ds - 1)
361 n = exif_get_short (d + offset, data->priv->order);
362 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
363 "Loading %i entries...", n);
366 /* Check if we have enough data. */
367 if (offset + 12 * n > ds)
368 n = (ds - offset) / 12;
370 for (i = 0; i < n; i++) {
372 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
374 case EXIF_TAG_EXIF_IFD_POINTER:
375 case EXIF_TAG_GPS_INFO_IFD_POINTER:
376 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
377 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
378 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
379 o = exif_get_long (d + offset + 12 * i + 8,
382 case EXIF_TAG_EXIF_IFD_POINTER:
383 CHECK_REC (EXIF_IFD_EXIF);
384 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
386 case EXIF_TAG_GPS_INFO_IFD_POINTER:
387 CHECK_REC (EXIF_IFD_GPS);
388 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
390 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
391 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
392 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
394 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
395 thumbnail_offset = o;
396 if (thumbnail_offset && thumbnail_length)
397 exif_data_load_data_thumbnail (data, d,
398 ds, thumbnail_offset,
401 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
402 thumbnail_length = o;
403 if (thumbnail_offset && thumbnail_length)
404 exif_data_load_data_thumbnail (data, d,
405 ds, thumbnail_offset,
415 * If we don't know the tag, don't fail. It could be that new
416 * versions of the standard have defined additional tags. Note that
417 * 0 is a valid tag in the GPS IFD.
419 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
422 * Special case: Tag and format 0. That's against specification.
423 * At least up to 2.2. But Photoshop writes it anyways.
425 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
426 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
427 "Skipping empty entry at position %i in '%s'.", i,
428 exif_ifd_get_name (ifd));
431 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
432 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
433 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
434 exif_ifd_get_name (ifd));
435 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
438 entry = exif_entry_new_mem (data->priv->mem);
439 if (exif_data_load_data_entry (data, entry, d, ds,
441 exif_content_add_entry (data->ifd[ifd], entry);
442 exif_entry_unref (entry);
449 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
451 ExifShort tag1 = exif_get_short (p1, o);
452 ExifShort tag2 = exif_get_short (p2, o);
454 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
458 cmp_func_intel (const void *elem1, const void *elem2)
460 return cmp_func ((const unsigned char *) elem1,
461 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
465 cmp_func_motorola (const void *elem1, const void *elem2)
467 return cmp_func ((const unsigned char *) elem1,
468 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
472 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
473 unsigned char **d, unsigned int *ds,
476 unsigned int j, n_ptr = 0, n_thumb = 0;
479 if (!data || !data->priv || !ifd || !d || !ds)
482 for (i = 0; i < EXIF_IFD_COUNT; i++)
483 if (ifd == data->ifd[i])
485 if (i == EXIF_IFD_COUNT)
489 * Check if we need some extra entries for pointers or the thumbnail.
495 * The pointer to IFD_EXIF is in IFD_0. The pointer to
496 * IFD_INTEROPERABILITY is in IFD_EXIF.
498 if (data->ifd[EXIF_IFD_EXIF]->count ||
499 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
502 /* The pointer to IFD_GPS is in IFD_0. */
503 if (data->ifd[EXIF_IFD_GPS]->count)
512 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
519 * Allocate enough memory for all entries
520 * and the number of entries.
522 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
523 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
525 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
529 /* Save the number of entries */
530 exif_set_short (*d + 6 + offset, data->priv->order,
531 (ExifShort) (ifd->count + n_ptr + n_thumb));
534 /* Save each entry */
535 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
536 "Saving %i entries (IFD '%s', offset: %i)...",
537 ifd->count, exif_ifd_get_name (i), offset);
538 for (j = 0; j < ifd->count; j++)
539 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
541 offset += 12 * ifd->count;
543 /* Now save special entries. */
548 * The pointer to IFD_EXIF is in IFD_0.
549 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
550 * therefore, if IFD_INTEROPERABILITY is not empty, we need
551 * IFD_EXIF even if latter is empty.
553 if (data->ifd[EXIF_IFD_EXIF]->count ||
554 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
555 exif_set_short (*d + 6 + offset + 0, data->priv->order,
556 EXIF_TAG_EXIF_IFD_POINTER);
557 exif_set_short (*d + 6 + offset + 2, data->priv->order,
559 exif_set_long (*d + 6 + offset + 4, data->priv->order,
561 exif_set_long (*d + 6 + offset + 8, data->priv->order,
563 exif_data_save_data_content (data,
564 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
568 /* The pointer to IFD_GPS is in IFD_0, too. */
569 if (data->ifd[EXIF_IFD_GPS]->count) {
570 exif_set_short (*d + 6 + offset + 0, data->priv->order,
571 EXIF_TAG_GPS_INFO_IFD_POINTER);
572 exif_set_short (*d + 6 + offset + 2, data->priv->order,
574 exif_set_long (*d + 6 + offset + 4, data->priv->order,
576 exif_set_long (*d + 6 + offset + 8, data->priv->order,
578 exif_data_save_data_content (data,
579 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
587 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
590 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
591 exif_set_short (*d + 6 + offset + 0, data->priv->order,
592 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
593 exif_set_short (*d + 6 + offset + 2, data->priv->order,
595 exif_set_long (*d + 6 + offset + 4, data->priv->order,
597 exif_set_long (*d + 6 + offset + 8, data->priv->order,
599 exif_data_save_data_content (data,
600 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
609 * Information about the thumbnail (if any) is saved in
614 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
615 exif_set_short (*d + 6 + offset + 0, data->priv->order,
616 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
617 exif_set_short (*d + 6 + offset + 2, data->priv->order,
619 exif_set_long (*d + 6 + offset + 4, data->priv->order,
621 exif_set_long (*d + 6 + offset + 8, data->priv->order,
624 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
626 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
630 memcpy (*d + *ds - data->size, data->data, data->size);
633 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
634 exif_set_short (*d + 6 + offset + 0, data->priv->order,
635 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
636 exif_set_short (*d + 6 + offset + 2, data->priv->order,
638 exif_set_long (*d + 6 + offset + 4, data->priv->order,
640 exif_set_long (*d + 6 + offset + 8, data->priv->order,
650 /* Sort the directory according to TIFF specification */
651 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
652 (ifd->count + n_ptr + n_thumb), 12,
653 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
655 /* Correctly terminate the directory */
656 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
660 * We are saving IFD 0. Tell where IFD 1 starts and save
663 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
664 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
667 exif_set_long (*d + 6 + offset, data->priv->order, 0);
671 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
672 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
673 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
674 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
675 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
676 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5
677 } ExifDataTypeMakerNote;
679 static ExifDataTypeMakerNote
680 exif_data_get_type_maker_note (ExifData *d)
686 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
688 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
690 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
692 /* Olympus & Nikon */
693 if ((e->size >= 8) && (!memcmp (e->data, "OLYMP", 6) ||
694 !memcmp (e->data, "OLYMPUS", 8) || !memcmp (e->data, "Nikon", 6)))
695 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
697 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
699 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
702 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
703 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
705 /* Pentax & some variant of Nikon */
706 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
708 exif_entry_get_value (em, value, sizeof(value)),
710 return EXIF_DATA_TYPE_MAKER_NOTE_NIKON;
712 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
714 if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
715 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
717 if ((e->size >= 8) && !memcmp (e->data, "QVC", 4)) {
718 return EXIF_DATA_TYPE_MAKER_NOTE_CASIO;
721 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
724 #define LOG_TOO_SMALL \
725 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
726 _("Size of data too small to allow for EXIF data."));
729 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
730 unsigned int ds_orig)
735 const unsigned char *d = d_orig;
736 unsigned int ds = ds_orig, len;
738 if (!data || !data->priv || !d || !ds)
741 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
742 "Parsing %i byte(s) EXIF data...\n", ds);
745 * It can be that the data starts with the EXIF header. If it does
746 * not, search the EXIF marker.
752 if (!memcmp (d, ExifHeader, 6)) {
753 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
754 "Found EXIF header.");
757 while ((d[0] == 0xff) && ds) {
762 /* JPEG_MARKER_SOI */
763 if (d[0] == JPEG_MARKER_SOI) {
769 /* JPEG_MARKER_APP0 */
770 if (d[0] == JPEG_MARKER_APP0) {
773 l = (d[0] << 8) | d[1];
781 /* JPEG_MARKER_APP1 */
782 if (d[0] == JPEG_MARKER_APP1)
785 /* Unknown marker or data. Give up. */
786 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
787 "ExifData", _("EXIF marker not found."));
796 len = (d[0] << 8) | d[1];
797 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
798 "We have to deal with %i byte(s) of EXIF data.",
805 * Verify the exif header
806 * (offset 2, length 6).
812 if (memcmp (d, ExifHeader, 6)) {
813 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
814 "ExifData", _("EXIF header not found."));
818 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
819 "Found EXIF header.");
821 /* Byte order (offset 6, length 2) */
824 if (!memcmp (d + 6, "II", 2))
825 data->priv->order = EXIF_BYTE_ORDER_INTEL;
826 else if (!memcmp (d + 6, "MM", 2))
827 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
829 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
830 "ExifData", _("Unknown encoding."));
835 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
839 offset = exif_get_long (d + 10, data->priv->order);
840 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
841 "IFD 0 at %i.", (int) offset);
843 /* Parse the actual exif data (usually offset 14 from start) */
844 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
847 if (offset + 6 + 2 > ds) {
850 n = exif_get_short (d + 6 + offset, data->priv->order);
851 if (offset + 6 + 2 + 12 * n + 4 > ds) {
854 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
856 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
857 "IFD 1 at %i.", (int) offset);
860 if (offset > ds - 6) {
861 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
862 "ExifData", "Bogus offset of IFD1.");
864 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
869 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
870 * cameras use pointers in the maker note tag that point to the
871 * space between IFDs. Here is the only place where we have access
874 switch (exif_data_get_type_maker_note (data)) {
875 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
876 case EXIF_DATA_TYPE_MAKER_NOTE_NIKON:
877 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
879 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
880 case EXIF_DATA_TYPE_MAKER_NOTE_CASIO:
881 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
883 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
884 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
891 * If we are able to interpret the maker note, do so.
893 if (data->priv->md) {
894 exif_mnote_data_log (data->priv->md, data->priv->log);
895 exif_mnote_data_set_byte_order (data->priv->md,
897 exif_mnote_data_set_offset (data->priv->md,
898 data->priv->offset_mnote);
899 exif_mnote_data_load (data->priv->md, d, ds);
902 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
903 exif_data_fix (data);
907 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
909 if (!data || !d || !ds)
914 *d = exif_data_alloc (data, *ds);
917 memcpy (*d, ExifHeader, 6);
919 /* Order (offset 6) */
920 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
921 memcpy (*d + 6, "II", 2);
923 memcpy (*d + 6, "MM", 2);
926 /* Fixed value (2 bytes, offset 8) */
927 exif_set_short (*d + 8, data->priv->order, 0x002a);
930 * IFD 0 offset (4 bytes, offset 10).
931 * We will start 8 bytes after the
932 * EXIF header (2 bytes for order, another 2 for the test, and
933 * 4 bytes for the IFD 0 offset make 8 bytes together).
935 exif_set_long (*d + 10, data->priv->order, 8);
937 /* Now save IFD 0. IFD 1 will be saved automatically. */
938 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
940 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
942 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
943 "Saved %i byte(s) EXIF data.", *ds);
947 exif_data_new_from_file (const char *path)
952 loader = exif_loader_new ();
953 exif_loader_write_file (loader, path);
954 edata = exif_loader_get_data (loader);
955 exif_loader_unref (loader);
961 exif_data_ref (ExifData *data)
966 data->priv->ref_count++;
970 exif_data_unref (ExifData *data)
975 data->priv->ref_count--;
976 if (!data->priv->ref_count)
977 exif_data_free (data);
981 exif_data_free (ExifData *data)
984 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
989 for (i = 0; i < EXIF_IFD_COUNT; i++) {
991 exif_content_unref (data->ifd[i]);
997 exif_mem_free (mem, data->data);
1002 if (data->priv->log) {
1003 exif_log_unref (data->priv->log);
1004 data->priv->log = NULL;
1006 if (data->priv->md) {
1007 exif_mnote_data_unref (data->priv->md);
1008 data->priv->md = NULL;
1010 exif_mem_free (mem, data->priv);
1011 exif_mem_free (mem, data);
1014 exif_mem_unref (mem);
1018 exif_data_dump (ExifData *data)
1025 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1026 if (data->ifd[i] && data->ifd[i]->count) {
1027 printf ("Dumping IFD '%s'...\n",
1028 exif_ifd_get_name (i));
1029 exif_content_dump (data->ifd[i], 0);
1034 printf ("%i byte(s) thumbnail data available.", data->size);
1035 if (data->size >= 4) {
1036 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1037 data->data[0], data->data[1],
1038 data->data[data->size - 2],
1039 data->data[data->size - 1]);
1045 exif_data_get_byte_order (ExifData *data)
1050 return (data->priv->order);
1054 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1062 for (i = 0; i < EXIF_IFD_COUNT; i++)
1063 func (data->ifd[i], user_data);
1066 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1067 struct _ByteOrderChangeData {
1068 ExifByteOrder old, new;
1072 entry_set_byte_order (ExifEntry *e, void *data)
1074 ByteOrderChangeData *d = data;
1079 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1083 content_set_byte_order (ExifContent *content, void *data)
1085 exif_content_foreach_entry (content, entry_set_byte_order, data);
1089 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1091 ByteOrderChangeData d;
1093 if (!data || (order == data->priv->order))
1096 d.old = data->priv->order;
1098 exif_data_foreach_content (data, content_set_byte_order, &d);
1099 data->priv->order = order;
1101 exif_mnote_data_set_byte_order (data->priv->md, order);
1105 exif_data_log (ExifData *data, ExifLog *log)
1109 if (!data || !data->priv)
1111 exif_log_unref (data->priv->log);
1112 data->priv->log = log;
1115 for (i = 0; i < EXIF_IFD_COUNT; i++)
1116 exif_content_log (data->ifd[i], log);
1119 /* Used internally within libexif */
1120 ExifLog *exif_data_get_log (ExifData *);
1122 exif_data_get_log (ExifData *data)
1124 if (!data || !data->priv)
1126 return data->priv->log;
1129 static const struct {
1130 ExifDataOption option;
1132 const char *description;
1133 } exif_data_option[] = {
1134 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1135 N_("Ignore unknown tags when loading EXIF data.")},
1136 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1137 N_("Add, correct and remove entries to get EXIF data that follows "
1138 "the specification.")},
1139 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1140 N_("When loading and resaving Exif data, save the maker note unmodified."
1141 " Be aware that the maker note can get corrupted.")},
1146 exif_data_option_get_name (ExifDataOption o)
1150 for (i = 0; exif_data_option[i].name; i++)
1151 if (exif_data_option[i].option == o)
1153 return _(exif_data_option[i].name);
1157 exif_data_option_get_description (ExifDataOption o)
1161 for (i = 0; exif_data_option[i].description; i++)
1162 if (exif_data_option[i].option == o)
1164 return _(exif_data_option[i].description);
1168 exif_data_set_option (ExifData *d, ExifDataOption o)
1173 d->priv->options |= o;
1177 exif_data_unset_option (ExifData *d, ExifDataOption o)
1182 d->priv->options &= ~o;
1186 fix_func (ExifContent *c, void *UNUSED(data))
1188 switch (exif_content_get_ifd (c)) {
1190 if (c->parent->data)
1191 exif_content_fix (c);
1193 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1194 "No thumbnail but entries on thumbnail. These entries have been "
1197 exif_content_remove_entry (c, c->entries[c->count - 1]);
1201 exif_content_fix (c);
1206 exif_data_fix (ExifData *d)
1208 exif_data_foreach_content (d, fix_func, NULL);
1212 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1217 d->priv->data_type = dt;
1221 exif_data_get_data_type (ExifData *d)
1223 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;