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>
32 #include <libexif/olympus/exif-mnote-data-olympus.h>
33 #include <libexif/canon/exif-mnote-data-canon.h>
34 #include <libexif/pentax/exif-mnote-data-pentax.h>
40 #if defined(__WATCOMC__) || defined(_MSC_VER)
41 # define strncasecmp strnicmp
44 #undef JPEG_MARKER_SOI
45 #define JPEG_MARKER_SOI 0xd8
46 #undef JPEG_MARKER_APP0
47 #define JPEG_MARKER_APP0 0xe0
48 #undef JPEG_MARKER_APP1
49 #define JPEG_MARKER_APP1 0xe1
51 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
53 struct _ExifDataPrivate
62 unsigned int ref_count;
64 /* Temporarily used while loading data */
65 unsigned int offset_mnote;
67 ExifDataOption options;
68 ExifDataType data_type;
72 exif_data_alloc (ExifData *data, unsigned int i)
79 d = exif_mem_alloc (data->priv->mem, i);
83 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
88 exif_data_get_mnote_data (ExifData *d)
90 return (d && d->priv) ? d->priv->md : NULL;
96 ExifMem *mem = exif_mem_new_default ();
97 ExifData *d = exif_data_new_mem (mem);
105 exif_data_new_mem (ExifMem *mem)
113 data = exif_mem_alloc (mem, sizeof (ExifData));
116 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
118 exif_mem_free (mem, data);
121 data->priv->ref_count = 1;
123 data->priv->mem = mem;
126 for (i = 0; i < EXIF_IFD_COUNT; i++) {
127 data->ifd[i] = exif_content_new_mem (data->priv->mem);
129 exif_data_free (data);
132 data->ifd[i]->parent = data;
135 /* Default options */
136 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
137 exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
139 /* Default data type: none */
140 exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
146 exif_data_new_from_data (const unsigned char *data, unsigned int size)
150 edata = exif_data_new ();
151 exif_data_load_data (edata, data, size);
156 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
157 const unsigned char *d,
158 unsigned int size, unsigned int offset)
160 unsigned int s, doff;
162 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
163 entry->format = exif_get_short (d + offset + 2, data->priv->order);
164 entry->components = exif_get_long (d + offset + 4, data->priv->order);
166 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
167 "Loading entry 0x%x ('%s')...", entry->tag,
168 exif_tag_get_name (entry->tag));
171 * Size? If bigger than 4 bytes, the actual data is not
172 * in the entry but somewhere else (offset).
174 s = exif_format_get_size (entry->format) * entry->components;
178 doff = exif_get_long (d + offset + 8, data->priv->order);
186 entry->data = exif_data_alloc (data, s);
189 memcpy (entry->data, d + doff, s);
192 /* If this is the MakerNote, remember the offset */
193 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
194 if (entry->size > 6) exif_log (data->priv->log,
195 EXIF_LOG_CODE_DEBUG, "ExifData",
196 "MakerNote found (%02x %02x %02x %02x "
197 "%02x %02x %02x...).",
198 entry->data[0], entry->data[1], entry->data[2],
199 entry->data[3], entry->data[4], entry->data[5],
201 data->priv->offset_mnote = doff;
207 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
208 unsigned char **d, unsigned int *ds,
211 unsigned int doff, s;
213 if (!data || !data->priv)
217 * Each entry is 12 bytes long. The memory for the entry has
218 * already been allocated.
220 exif_set_short (*d + 6 + offset + 0,
221 data->priv->order, (ExifShort) e->tag);
222 exif_set_short (*d + 6 + offset + 2,
223 data->priv->order, (ExifShort) e->format);
225 #ifndef EXIF_DONT_CHANGE_MAKER_NOTE
226 /* If this is the maker note tag, update it. */
227 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
228 exif_mem_free (data->priv->mem, e->data);
231 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
232 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
233 e->components = e->size;
237 exif_set_long (*d + 6 + offset + 4,
238 data->priv->order, e->components);
241 * Size? If bigger than 4 bytes, the actual data is not in
242 * the entry but somewhere else.
244 s = exif_format_get_size (e->format) * e->components;
250 * According to the TIFF specification,
251 * the offset must be an even number. If we need to introduce
252 * a padding byte, we set it to 0.
256 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
258 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
261 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
263 *(*d + *ds - 1) = '\0';
268 /* Write the data. Fill unneeded bytes with 0. */
269 memcpy (*d + 6 + doff, e->data, s);
271 memset (*d + 6 + doff + s, 0, (4 - s));
275 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
276 unsigned int ds, ExifLong offset, ExifLong size)
278 if (ds < offset + size) {
279 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
280 "Bogus thumbnail offset and size: %i < %i + %i.",
281 (int) ds, (int) offset, (int) size);
285 exif_mem_free (data->priv->mem, data->data);
287 data->data = exif_data_alloc (data, data->size);
290 memcpy (data->data, d + offset, data->size);
294 #define CHECK_REC(i) \
296 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
297 "ExifData", "Recursive entry in IFD " \
298 "'%s' detected. Skipping...", \
299 exif_ifd_get_name (i)); \
302 if (data->ifd[(i)]->count) { \
303 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
304 "ExifData", "Attemt to load IFD " \
305 "'%s' multiple times detected. " \
307 exif_ifd_get_name (i)); \
312 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
313 const unsigned char *d,
314 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
316 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
322 if (!data || !data->priv)
324 if ((ifd < 0) || (ifd >= EXIF_IFD_COUNT))
327 if (recursion_depth > 150) {
328 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
329 "Deep recursion detected!");
333 /* Read the number of entries */
334 if (offset >= ds - 1)
336 n = exif_get_short (d + offset, data->priv->order);
337 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
338 "Loading %i entries...", n);
341 /* Check if we have enough data. */
342 if (offset + 12 * n > ds)
343 n = (ds - offset) / 12;
345 for (i = 0; i < n; i++) {
347 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
349 case EXIF_TAG_EXIF_IFD_POINTER:
350 case EXIF_TAG_GPS_INFO_IFD_POINTER:
351 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
352 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
353 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
354 o = exif_get_long (d + offset + 12 * i + 8,
357 case EXIF_TAG_EXIF_IFD_POINTER:
358 CHECK_REC (EXIF_IFD_EXIF);
359 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
361 case EXIF_TAG_GPS_INFO_IFD_POINTER:
362 CHECK_REC (EXIF_IFD_GPS);
363 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
365 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
366 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
367 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
369 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
370 thumbnail_offset = o;
371 if (thumbnail_offset && thumbnail_length)
372 exif_data_load_data_thumbnail (data, d,
373 ds, thumbnail_offset,
376 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
377 thumbnail_length = o;
378 if (thumbnail_offset && thumbnail_length)
379 exif_data_load_data_thumbnail (data, d,
380 ds, thumbnail_offset,
390 * If we don't know the tag, don't fail. It could be that new
391 * versions of the standard have defined additional tags. Note that
392 * 0 is a valid tag in the GPS IFD.
394 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
397 * Special case: Tag and format 0. That's against specification.
398 * At least up to 2.2. But Photoshop writes it anyways.
400 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
401 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
402 "Skipping empty entry at position %i in '%s'.", i,
403 exif_ifd_get_name (ifd));
406 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
407 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
408 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
409 exif_ifd_get_name (ifd));
410 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
413 entry = exif_entry_new_mem (data->priv->mem);
414 if (exif_data_load_data_entry (data, entry, d, ds,
416 exif_content_add_entry (data->ifd[ifd], entry);
417 exif_entry_unref (entry);
424 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
426 ExifShort tag1 = exif_get_short (p1, o);
427 ExifShort tag2 = exif_get_short (p2, o);
429 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
433 cmp_func_intel (const void *elem1, const void *elem2)
435 return cmp_func ((const unsigned char *) elem1,
436 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
440 cmp_func_motorola (const void *elem1, const void *elem2)
442 return cmp_func ((const unsigned char *) elem1,
443 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
447 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
448 unsigned char **d, unsigned int *ds,
451 unsigned int j, n_ptr = 0, n_thumb = 0;
454 if (!data || !data->priv || !ifd || !d || !ds)
457 for (i = 0; i < EXIF_IFD_COUNT; i++)
458 if (ifd == data->ifd[i])
460 if (i == EXIF_IFD_COUNT)
464 * Check if we need some extra entries for pointers or the thumbnail.
470 * The pointer to IFD_EXIF is in IFD_0. The pointer to
471 * IFD_INTEROPERABILITY is in IFD_EXIF.
473 if (data->ifd[EXIF_IFD_EXIF]->count ||
474 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
477 /* The pointer to IFD_GPS is in IFD_0. */
478 if (data->ifd[EXIF_IFD_GPS]->count)
487 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
494 * Allocate enough memory for all entries
495 * and the number of entries.
497 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
498 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
500 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
504 /* Save the number of entries */
505 exif_set_short (*d + 6 + offset, data->priv->order,
506 (ExifShort) (ifd->count + n_ptr + n_thumb));
509 /* Save each entry */
510 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
511 "Saving %i entries (IFD '%s', offset: %i)...",
512 ifd->count, exif_ifd_get_name (i), offset);
513 for (j = 0; j < ifd->count; j++)
514 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
516 offset += 12 * ifd->count;
518 /* Now save special entries. */
523 * The pointer to IFD_EXIF is in IFD_0.
524 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
525 * therefore, if IFD_INTEROPERABILITY is not empty, we need
526 * IFD_EXIF even if latter is empty.
528 if (data->ifd[EXIF_IFD_EXIF]->count ||
529 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
530 exif_set_short (*d + 6 + offset + 0, data->priv->order,
531 EXIF_TAG_EXIF_IFD_POINTER);
532 exif_set_short (*d + 6 + offset + 2, data->priv->order,
534 exif_set_long (*d + 6 + offset + 4, data->priv->order,
536 exif_set_long (*d + 6 + offset + 8, data->priv->order,
538 exif_data_save_data_content (data,
539 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
543 /* The pointer to IFD_GPS is in IFD_0, too. */
544 if (data->ifd[EXIF_IFD_GPS]->count) {
545 exif_set_short (*d + 6 + offset + 0, data->priv->order,
546 EXIF_TAG_GPS_INFO_IFD_POINTER);
547 exif_set_short (*d + 6 + offset + 2, data->priv->order,
549 exif_set_long (*d + 6 + offset + 4, data->priv->order,
551 exif_set_long (*d + 6 + offset + 8, data->priv->order,
553 exif_data_save_data_content (data,
554 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
562 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
565 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
566 exif_set_short (*d + 6 + offset + 0, data->priv->order,
567 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
568 exif_set_short (*d + 6 + offset + 2, data->priv->order,
570 exif_set_long (*d + 6 + offset + 4, data->priv->order,
572 exif_set_long (*d + 6 + offset + 8, data->priv->order,
574 exif_data_save_data_content (data,
575 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
584 * Information about the thumbnail (if any) is saved in
589 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
590 exif_set_short (*d + 6 + offset + 0, data->priv->order,
591 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
592 exif_set_short (*d + 6 + offset + 2, data->priv->order,
594 exif_set_long (*d + 6 + offset + 4, data->priv->order,
596 exif_set_long (*d + 6 + offset + 8, data->priv->order,
599 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
601 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
605 memcpy (*d + *ds - data->size, data->data, data->size);
608 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
609 exif_set_short (*d + 6 + offset + 0, data->priv->order,
610 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
611 exif_set_short (*d + 6 + offset + 2, data->priv->order,
613 exif_set_long (*d + 6 + offset + 4, data->priv->order,
615 exif_set_long (*d + 6 + offset + 8, data->priv->order,
625 /* Sort the directory according to TIFF specification */
626 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
627 (ifd->count + n_ptr + n_thumb), 12,
628 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
630 /* Correctly terminate the directory */
631 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
635 * We are saving IFD 0. Tell where IFD 1 starts and save
638 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
639 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
642 exif_set_long (*d + 6 + offset, data->priv->order, 0);
646 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
647 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
648 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
649 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3
650 } ExifDataTypeMakerNote;
652 static ExifDataTypeMakerNote
653 exif_data_get_type_maker_note (ExifData *d)
659 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
661 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
663 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
665 /* Olympus & Nikon */
666 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
667 !memcmp (e->data, "Nikon", 5)))
668 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
670 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
672 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
675 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
676 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
678 /* Pentax & some variant of Nikon */
679 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
681 exif_entry_get_value (em, value, sizeof(value)),
683 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
685 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
688 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
691 #define LOG_TOO_SMALL \
692 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
693 _("Size of data too small to allow for EXIF data."));
696 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
697 unsigned int ds_orig)
702 const unsigned char *d = d_orig;
703 unsigned int ds = ds_orig, len;
705 if (!data || !data->priv || !d || !ds)
708 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
709 "Parsing %i byte(s) EXIF data...\n", ds);
712 * It can be that the data starts with the EXIF header. If it does
713 * not, search the EXIF marker.
719 if (!memcmp (d, ExifHeader, 6)) {
720 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
721 "Found EXIF header.");
724 while ((d[0] == 0xff) && ds) {
729 /* JPEG_MARKER_SOI */
730 if (d[0] == JPEG_MARKER_SOI) {
736 /* JPEG_MARKER_APP0 */
737 if (d[0] == JPEG_MARKER_APP0) {
740 l = (d[0] << 8) | d[1];
748 /* JPEG_MARKER_APP1 */
749 if (d[0] == JPEG_MARKER_APP1)
752 /* Unknown marker or data. Give up. */
753 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
754 "ExifData", _("EXIF marker not found."));
763 len = (d[0] << 8) | d[1];
764 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
765 "We have to deal with %i byte(s) of EXIF data.",
772 * Verify the exif header
773 * (offset 2, length 6).
779 if (memcmp (d, ExifHeader, 6)) {
780 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
781 "ExifData", _("EXIF header not found."));
785 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
786 "Found EXIF header.");
788 /* Byte order (offset 6, length 2) */
791 if (!memcmp (d + 6, "II", 2))
792 data->priv->order = EXIF_BYTE_ORDER_INTEL;
793 else if (!memcmp (d + 6, "MM", 2))
794 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
796 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
797 "ExifData", _("Unknown encoding."));
802 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
806 offset = exif_get_long (d + 10, data->priv->order);
807 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
808 "IFD 0 at %i.", (int) offset);
810 /* Parse the actual exif data (usually offset 14 from start) */
811 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
814 if (offset + 6 + 2 > ds) {
817 n = exif_get_short (d + 6 + offset, data->priv->order);
818 if (offset + 6 + 2 + 12 * n + 4 > ds) {
821 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
823 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
824 "IFD 1 at %i.", (int) offset);
827 if (offset > ds - 6) {
828 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
829 "ExifData", "Bogus offset.");
833 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
837 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
838 * cameras use pointers in the maker note tag that point to the
839 * space between IFDs. Here is the only place where we have access
842 switch (exif_data_get_type_maker_note (data)) {
843 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
844 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
846 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
847 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
849 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
850 data->priv->md = exif_mnote_data_canon_new (data->priv->mem);
857 * If we are able to interpret the maker note, do so.
859 if (data->priv->md) {
860 exif_mnote_data_log (data->priv->md, data->priv->log);
861 exif_mnote_data_set_byte_order (data->priv->md,
863 exif_mnote_data_set_offset (data->priv->md,
864 data->priv->offset_mnote);
865 exif_mnote_data_load (data->priv->md, d, ds);
868 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
869 exif_data_fix (data);
873 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
875 if (!data || !d || !ds)
880 *d = exif_data_alloc (data, *ds);
883 memcpy (*d, ExifHeader, 6);
885 /* Order (offset 6) */
886 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
887 memcpy (*d + 6, "II", 2);
889 memcpy (*d + 6, "MM", 2);
892 /* Fixed value (2 bytes, offset 8) */
893 exif_set_short (*d + 8, data->priv->order, 0x002a);
896 * IFD 0 offset (4 bytes, offset 10).
897 * We will start 8 bytes after the
898 * EXIF header (2 bytes for order, another 2 for the test, and
899 * 4 bytes for the IFD 0 offset make 8 bytes together).
901 exif_set_long (*d + 10, data->priv->order, 8);
903 /* Now save IFD 0. IFD 1 will be saved automatically. */
904 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
906 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
908 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
909 "Saved %i byte(s) EXIF data.", *ds);
913 exif_data_new_from_file (const char *path)
918 loader = exif_loader_new ();
919 exif_loader_write_file (loader, path);
920 edata = exif_loader_get_data (loader);
921 exif_loader_unref (loader);
927 exif_data_ref (ExifData *data)
932 data->priv->ref_count++;
936 exif_data_unref (ExifData *data)
941 data->priv->ref_count--;
942 if (!data->priv->ref_count)
943 exif_data_free (data);
947 exif_data_free (ExifData *data)
950 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
955 for (i = 0; i < EXIF_IFD_COUNT; i++) {
957 exif_content_unref (data->ifd[i]);
963 exif_mem_free (mem, data->data);
968 if (data->priv->log) {
969 exif_log_unref (data->priv->log);
970 data->priv->log = NULL;
972 if (data->priv->md) {
973 exif_mnote_data_unref (data->priv->md);
974 data->priv->md = NULL;
976 exif_mem_free (mem, data->priv);
977 exif_mem_free (mem, data);
980 exif_mem_unref (mem);
984 exif_data_dump (ExifData *data)
991 for (i = 0; i < EXIF_IFD_COUNT; i++) {
992 if (data->ifd[i] && data->ifd[i]->count) {
993 printf ("Dumping IFD '%s'...\n",
994 exif_ifd_get_name (i));
995 exif_content_dump (data->ifd[i], 0);
1000 printf ("%i byte(s) thumbnail data available.", data->size);
1001 if (data->size >= 4) {
1002 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1003 data->data[0], data->data[1],
1004 data->data[data->size - 2],
1005 data->data[data->size - 1]);
1011 exif_data_get_byte_order (ExifData *data)
1016 return (data->priv->order);
1020 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1028 for (i = 0; i < EXIF_IFD_COUNT; i++)
1029 func (data->ifd[i], user_data);
1032 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1033 struct _ByteOrderChangeData {
1034 ExifByteOrder old, new;
1038 entry_set_byte_order (ExifEntry *e, void *data)
1040 ByteOrderChangeData *d = data;
1045 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1049 content_set_byte_order (ExifContent *content, void *data)
1051 exif_content_foreach_entry (content, entry_set_byte_order, data);
1055 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1057 ByteOrderChangeData d;
1059 if (!data || (order == data->priv->order))
1062 d.old = data->priv->order;
1064 exif_data_foreach_content (data, content_set_byte_order, &d);
1065 data->priv->order = order;
1067 exif_mnote_data_set_byte_order (data->priv->md, order);
1071 exif_data_log (ExifData *data, ExifLog *log)
1075 if (!data || !data->priv)
1077 exif_log_unref (data->priv->log);
1078 data->priv->log = log;
1081 for (i = 0; i < EXIF_IFD_COUNT; i++)
1082 exif_content_log (data->ifd[i], log);
1085 /* Used internally within libexif */
1086 ExifLog *exif_data_get_log (ExifData *);
1088 exif_data_get_log (ExifData *data)
1090 if (!data || !data->priv)
1092 return data->priv->log;
1096 ExifDataOption option;
1098 const char *description;
1099 } exif_data_option[] = {
1100 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1101 N_("Ignore unknown tags when loading EXIF data.")},
1102 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1103 N_("Add, correct and remove entries to get EXIF data that follows "
1104 "the specification.")},
1109 exif_data_option_get_name (ExifDataOption o)
1113 for (i = 0; exif_data_option[i].name; i++)
1114 if (exif_data_option[i].option == o)
1116 return _(exif_data_option[i].name);
1120 exif_data_option_get_description (ExifDataOption o)
1124 for (i = 0; exif_data_option[i].description; i++)
1125 if (exif_data_option[i].option == o)
1127 return _(exif_data_option[i].description);
1131 exif_data_set_option (ExifData *d, ExifDataOption o)
1136 d->priv->options |= o;
1140 exif_data_unset_option (ExifData *d, ExifDataOption o)
1145 d->priv->options &= ~o;
1149 fix_func (ExifContent *c, void *data)
1151 switch (exif_content_get_ifd (c)) {
1153 if (c->parent->data)
1154 exif_content_fix (c);
1156 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1157 "No thumbnail but entries on thumbnail. These entries have been "
1160 exif_content_remove_entry (c, c->entries[c->count - 1]);
1164 exif_content_fix (c);
1169 exif_data_fix (ExifData *d)
1171 exif_data_foreach_content (d, fix_func, NULL);
1175 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1180 d->priv->data_type = dt;
1184 exif_data_get_data_type (ExifData *d)
1186 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;