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>
31 #include <libjpeg/jpeg-marker.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>
42 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
44 #if defined(__WATCOMC__) || defined(_MSC_VER)
45 # define strncasecmp strnicmp
48 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
50 struct _ExifDataPrivate
59 unsigned int ref_count;
61 /* Temporarily used while loading data */
62 unsigned int offset_mnote;
66 exif_data_alloc (ExifData *data, unsigned int i)
70 if (!data || !i) return NULL;
72 d = exif_mem_alloc (data->priv->mem, i);
75 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
80 exif_data_get_mnote_data (ExifData *d)
82 return (d && d->priv) ? d->priv->md : NULL;
88 ExifMem *mem = exif_mem_new_default ();
89 ExifData *d = exif_data_new_mem (mem);
97 exif_data_new_mem (ExifMem *mem)
102 if (!mem) return NULL;
104 data = exif_mem_alloc (mem, sizeof (ExifData));
105 if (!data) return (NULL);
106 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
107 if (!data->priv) { exif_mem_free (mem, data); return (NULL); }
108 data->priv->ref_count = 1;
110 data->priv->mem = mem;
113 for (i = 0; i < EXIF_IFD_COUNT; i++) {
114 data->ifd[i] = exif_content_new_mem (data->priv->mem);
116 exif_data_free (data);
119 data->ifd[i]->parent = data;
126 exif_data_new_from_data (const unsigned char *data, unsigned int size)
130 edata = exif_data_new ();
131 exif_data_load_data (edata, data, size);
136 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
137 const unsigned char *d,
138 unsigned int size, unsigned int offset)
140 unsigned int s, doff;
142 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
143 entry->format = exif_get_short (d + offset + 2, data->priv->order);
144 entry->components = exif_get_long (d + offset + 4, data->priv->order);
146 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
147 "Loading entry 0x%x ('%s')...", entry->tag,
148 exif_tag_get_name (entry->tag));
151 * Size? If bigger than 4 bytes, the actual data is not
152 * in the entry but somewhere else (offset).
154 s = exif_format_get_size (entry->format) * entry->components;
158 doff = exif_get_long (d + offset + 8, data->priv->order);
166 entry->data = exif_data_alloc (data, s);
169 memcpy (entry->data, d + doff, s);
172 /* If this is the MakerNote, remember the offset */
173 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
174 if (entry->size > 6) exif_log (data->priv->log,
175 EXIF_LOG_CODE_DEBUG, "ExifData",
176 "MakerNote found (%02x %02x %02x %02x "
177 "%02x %02x %02x...).",
178 entry->data[0], entry->data[1], entry->data[2],
179 entry->data[3], entry->data[4], entry->data[5],
181 data->priv->offset_mnote = doff;
184 exif_entry_fix (entry);
188 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
189 unsigned char **d, unsigned int *ds,
192 unsigned int doff, s;
194 if (!data || !data->priv) return;
197 * Each entry is 12 bytes long. The memory for the entry has
198 * already been allocated.
200 exif_set_short (*d + 6 + offset + 0,
201 data->priv->order, (ExifShort) e->tag);
202 exif_set_short (*d + 6 + offset + 2,
203 data->priv->order, (ExifShort) e->format);
205 #ifndef EXIF_DONT_CHANGE_MAKER_NOTE
206 /* If this is the maker note tag, update it. */
207 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
208 exif_mem_free (data->priv->mem, e->data);
211 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
212 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
213 e->components = e->size;
217 exif_set_long (*d + 6 + offset + 4,
218 data->priv->order, e->components);
221 * Size? If bigger than 4 bytes, the actual data is not in
222 * the entry but somewhere else.
224 s = exif_format_get_size (e->format) * e->components;
230 * According to the TIFF specification,
231 * the offset must be an even number. If we need to introduce
232 * a padding byte, we set it to 0.
235 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
237 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
240 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
241 if (s & 1) *(*d + *ds - 1) = '\0';
246 /* Write the data. Fill unneeded bytes with 0. */
247 memcpy (*d + 6 + doff, e->data, s);
248 if (s < 4) memset (*d + 6 + doff + s, 0, (4 - s));
252 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
253 unsigned int ds, ExifLong offset, ExifLong size)
255 if (ds < offset + size) {
256 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
257 "Bogus thumbnail offset and size: %i < %i + %i.",
258 (int) ds, (int) offset, (int) size);
261 if (data->data) exif_mem_free (data->priv->mem, data->data);
263 data->data = exif_data_alloc (data, data->size);
264 if (!data->data) return;
265 memcpy (data->data, d + offset, data->size);
269 #define CHECK_REC(i) \
270 if (data->ifd[(i)] == ifd) { \
271 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
272 "ExifData", "Recursive entry in IFD " \
273 "'%s' detected. Skipping...", \
274 exif_ifd_get_name (i)); \
277 if (data->ifd[(i)]->count) { \
278 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
279 "ExifData", "Attemt to load IFD " \
280 "'%s' multiple times detected. " \
282 exif_ifd_get_name (i)); \
287 exif_data_load_data_content (ExifData *data, ExifContent *ifd,
288 const unsigned char *d,
289 unsigned int ds, unsigned int offset)
291 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
297 if (!data || !data->priv) return;
299 /* Read the number of entries */
300 if (offset >= ds - 1) return;
301 n = exif_get_short (d + offset, data->priv->order);
302 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
303 "Loading %i entries...", n);
306 /* Check if we have enough data. */
307 if (offset + 12 * n > ds) n = (ds - offset) / 12;
309 for (i = 0; i < n; i++) {
311 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
313 case EXIF_TAG_EXIF_IFD_POINTER:
314 case EXIF_TAG_GPS_INFO_IFD_POINTER:
315 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
316 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
317 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
318 o = exif_get_long (d + offset + 12 * i + 8,
321 case EXIF_TAG_EXIF_IFD_POINTER:
322 CHECK_REC (EXIF_IFD_EXIF);
323 exif_data_load_data_content (data,
324 data->ifd[EXIF_IFD_EXIF], d, ds, o);
326 case EXIF_TAG_GPS_INFO_IFD_POINTER:
327 CHECK_REC (EXIF_IFD_GPS);
328 exif_data_load_data_content (data,
329 data->ifd[EXIF_IFD_GPS], d, ds, o);
331 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
332 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
333 exif_data_load_data_content (data,
334 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds, o);
336 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
337 thumbnail_offset = o;
338 if (thumbnail_offset && thumbnail_length)
339 exif_data_load_data_thumbnail (data, d,
340 ds, thumbnail_offset,
343 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
344 thumbnail_length = o;
345 if (thumbnail_offset && thumbnail_length)
346 exif_data_load_data_thumbnail (data, d,
347 ds, thumbnail_offset,
357 * If we don't know the tag, chances are high
358 * that the EXIF data does not follow the standard.
360 if (!exif_tag_get_name (tag)) {
361 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
362 "Unknown tag %x (entry %i)", tag, i);
365 entry = exif_entry_new_mem (data->priv->mem);
366 exif_data_load_data_entry (data, entry, d, ds,
368 exif_content_add_entry (ifd, entry);
369 exif_entry_unref (entry);
376 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
377 unsigned char **d, unsigned int *ds,
380 unsigned int j, n_ptr = 0, n_thumb = 0;
382 ExifEntry *le = NULL;
384 if (!data || !data->priv || !ifd || !d || !ds) return;
386 for (i = 0; i < EXIF_IFD_COUNT; i++)
387 if (ifd == data->ifd[i])
389 if (i == EXIF_IFD_COUNT)
393 * Check if we need some extra entries for pointers or the thumbnail.
399 * The pointer to IFD_EXIF is in IFD_0. The pointer to
400 * IFD_INTEROPERABILITY is in IFD_EXIF.
402 if (data->ifd[EXIF_IFD_EXIF]->count ||
403 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
406 /* The pointer to IFD_GPS is in IFD_0. */
407 if (data->ifd[EXIF_IFD_GPS]->count)
416 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
423 * Allocate enough memory for all entries
424 * and the number of entries.
426 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
427 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
429 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
433 /* Save the number of entries */
434 exif_set_short (*d + 6 + offset, data->priv->order,
435 (ExifShort) (ifd->count + n_ptr + n_thumb));
439 * Save each entry. TIFF specification requires entries to be sorted
440 * by tags. Yes, the sorting routine can be improved. Please submit a
443 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
444 "Saving %i entries (IFD '%s', offset: %i)...",
445 ifd->count, exif_ifd_get_name (i), offset);
446 for (j = 0; j < ifd->count; j++) {
447 ExifEntry *me = NULL;
450 for (k = 0; k < ifd->count; k++) {
451 if (le && ((ifd->entries[k]->tag < le->tag) ||
452 ((ifd->entries[k]->tag == le->tag) && (le <= ifd->entries[k]))))
454 if (!me || (me && ((me->tag > ifd->entries[k]->tag) ||
455 ((me->tag == ifd->entries[k]->tag) && (me <= ifd->entries[k])))))
456 me = ifd->entries[k];
459 exif_data_save_data_entry (data, me, d, ds, offset + 12 * j);
463 offset += 12 * ifd->count;
465 /* Now save special entries. */
470 * The pointer to IFD_EXIF is in IFD_0.
471 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
472 * therefore, if IFD_INTEROPERABILITY is not empty, we need
473 * IFD_EXIF even if latter is empty.
475 if (data->ifd[EXIF_IFD_EXIF]->count ||
476 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
477 exif_set_short (*d + 6 + offset + 0, data->priv->order,
478 EXIF_TAG_EXIF_IFD_POINTER);
479 exif_set_short (*d + 6 + offset + 2, data->priv->order,
481 exif_set_long (*d + 6 + offset + 4, data->priv->order,
483 exif_set_long (*d + 6 + offset + 8, data->priv->order,
485 exif_data_save_data_content (data,
486 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
490 /* The pointer to IFD_GPS is in IFD_0, too. */
491 if (data->ifd[EXIF_IFD_GPS]->count) {
492 exif_set_short (*d + 6 + offset + 0, data->priv->order,
493 EXIF_TAG_GPS_INFO_IFD_POINTER);
494 exif_set_short (*d + 6 + offset + 2, data->priv->order,
496 exif_set_long (*d + 6 + offset + 4, data->priv->order,
498 exif_set_long (*d + 6 + offset + 8, data->priv->order,
500 exif_data_save_data_content (data,
501 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
509 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
512 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
513 exif_set_short (*d + 6 + offset + 0, data->priv->order,
514 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
515 exif_set_short (*d + 6 + offset + 2, data->priv->order,
517 exif_set_long (*d + 6 + offset + 4, data->priv->order,
519 exif_set_long (*d + 6 + offset + 8, data->priv->order,
521 exif_data_save_data_content (data,
522 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
531 * Information about the thumbnail (if any) is saved in
536 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
537 exif_set_short (*d + 6 + offset + 0, data->priv->order,
538 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
539 exif_set_short (*d + 6 + offset + 2, data->priv->order,
541 exif_set_long (*d + 6 + offset + 4, data->priv->order,
543 exif_set_long (*d + 6 + offset + 8, data->priv->order,
546 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
548 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
552 memcpy (*d + *ds - data->size, data->data, data->size);
555 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
556 exif_set_short (*d + 6 + offset + 0, data->priv->order,
557 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
558 exif_set_short (*d + 6 + offset + 2, data->priv->order,
560 exif_set_long (*d + 6 + offset + 4, data->priv->order,
562 exif_set_long (*d + 6 + offset + 8, data->priv->order,
572 /* Correctly terminate the directory */
573 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
577 * We are saving IFD 0. Tell where IFD 1 starts and save
580 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
581 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
584 exif_set_long (*d + 6 + offset, data->priv->order, 0);
588 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
589 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
590 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
591 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3
592 } ExifDataTypeMakerNote;
594 static ExifDataTypeMakerNote
595 exif_data_get_type_maker_note (ExifData *d)
600 if (!d) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
602 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
603 if (!e) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
605 /* Olympus & Nikon */
606 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
607 !memcmp (e->data, "Nikon", 5)))
608 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
610 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
611 if (!em) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
614 if (!strcmp (exif_entry_get_value (em, value, sizeof(value)), "Canon"))
615 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
617 /* Pentax & some variant of Nikon */
618 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
620 exif_entry_get_value (em, value, sizeof(value)),
622 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
624 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
627 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
631 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
632 unsigned int ds_orig)
637 const unsigned char *d = d_orig;
638 unsigned int ds = ds_orig, len;
640 if (!data || !data->priv || !d || !ds) return;
642 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
643 "Parsing %i byte(s) EXIF data...\n", ds);
646 * It can be that the data starts with the EXIF header. If it does
647 * not, search the EXIF marker.
650 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
654 if (!memcmp (d, ExifHeader, 6)) {
655 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
656 "Found EXIF header.");
659 while ((d[0] == 0xff) && ds) {
664 /* JPEG_MARKER_SOI */
665 if (d[0] == JPEG_MARKER_SOI) {
671 /* JPEG_MARKER_APP0 */
672 if (d[0] == JPEG_MARKER_APP0) {
675 l = (d[0] << 8) | d[1];
683 /* JPEG_MARKER_APP1 */
684 if (d[0] == JPEG_MARKER_APP1)
687 /* Unknown marker or data. Give up. */
688 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
689 "ExifData", "EXIF marker not found.");
695 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
696 "ExifData", "Size too small.");
699 len = (d[0] << 8) | d[1];
700 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
701 "We have to deal with %i byte(s) of EXIF data.",
708 * Verify the exif header
709 * (offset 2, length 6).
712 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
716 if (memcmp (d, ExifHeader, 6)) {
717 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
718 "EXIF header not found.");
722 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
723 "Found EXIF header.");
725 /* Byte order (offset 6, length 2) */
728 if (!memcmp (d + 6, "II", 2))
729 data->priv->order = EXIF_BYTE_ORDER_INTEL;
730 else if (!memcmp (d + 6, "MM", 2))
731 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
736 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
740 offset = exif_get_long (d + 10, data->priv->order);
741 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
742 "IFD 0 at %i.", (int) offset);
744 /* Parse the actual exif data (usually offset 14 from start) */
745 exif_data_load_data_content (data, data->ifd[EXIF_IFD_0], d + 6,
749 if (offset + 6 + 2 > ds) {
752 n = exif_get_short (d + 6 + offset, data->priv->order);
753 if (offset + 6 + 2 + 12 * n + 4 > ds) {
756 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
758 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
759 "IFD 1 at %i.", (int) offset);
762 if (offset > ds - 6) {
763 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
764 "ExifData", "Bogus offset!");
768 exif_data_load_data_content (data, data->ifd[EXIF_IFD_1], d + 6,
773 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
774 * cameras use pointers in the maker note tag that point to the
775 * space between IFDs. Here is the only place where we have access
778 switch (exif_data_get_type_maker_note (data)) {
779 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
780 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
782 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
783 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
785 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
786 data->priv->md = exif_mnote_data_canon_new (data->priv->mem);
793 * If we are able to interpret the maker note, do so.
795 if (data->priv->md) {
796 exif_mnote_data_log (data->priv->md, data->priv->log);
797 exif_mnote_data_set_byte_order (data->priv->md,
799 exif_mnote_data_set_offset (data->priv->md,
800 data->priv->offset_mnote);
801 exif_mnote_data_load (data->priv->md, d, ds);
806 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
808 if (!data || !d || !ds)
813 *d = exif_data_alloc (data, *ds);
815 memcpy (*d, ExifHeader, 6);
817 /* Order (offset 6) */
818 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
819 memcpy (*d + 6, "II", 2);
821 memcpy (*d + 6, "MM", 2);
824 /* Fixed value (2 bytes, offset 8) */
825 exif_set_short (*d + 8, data->priv->order, 0x002a);
828 * IFD 0 offset (4 bytes, offset 10).
829 * We will start 8 bytes after the
830 * EXIF header (2 bytes for order, another 2 for the test, and
831 * 4 bytes for the IFD 0 offset make 8 bytes together).
833 exif_set_long (*d + 10, data->priv->order, 8);
835 /* Now save IFD 0. IFD 1 will be saved automatically. */
836 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
838 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
840 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
841 "Saved %i byte(s) EXIF data.", *ds);
845 exif_data_new_from_file (const char *path)
850 loader = exif_loader_new ();
851 exif_loader_write_file (loader, path);
852 edata = exif_loader_get_data (loader);
853 exif_loader_unref (loader);
859 exif_data_ref (ExifData *data)
864 data->priv->ref_count++;
868 exif_data_unref (ExifData *data)
872 data->priv->ref_count--;
873 if (!data->priv->ref_count) exif_data_free (data);
877 exif_data_free (ExifData *data)
880 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
884 for (i = 0; i < EXIF_IFD_COUNT; i++) {
886 exif_content_unref (data->ifd[i]);
892 exif_mem_free (mem, data->data);
897 if (data->priv->log) {
898 exif_log_unref (data->priv->log);
899 data->priv->log = NULL;
901 if (data->priv->md) {
902 exif_mnote_data_unref (data->priv->md);
903 data->priv->md = NULL;
905 exif_mem_free (mem, data->priv);
906 exif_mem_free (mem, data);
909 exif_mem_unref (mem);
913 exif_data_dump (ExifData *data)
920 for (i = 0; i < EXIF_IFD_COUNT; i++) {
921 if (data->ifd[i] && data->ifd[i]->count) {
922 printf ("Dumping IFD '%s'...\n",
923 exif_ifd_get_name (i));
924 exif_content_dump (data->ifd[i], 0);
929 printf ("%i byte(s) thumbnail data available.", data->size);
930 if (data->size >= 4) {
931 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
932 data->data[0], data->data[1],
933 data->data[data->size - 2],
934 data->data[data->size - 1]);
940 exif_data_get_byte_order (ExifData *data)
945 return (data->priv->order);
949 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
957 for (i = 0; i < EXIF_IFD_COUNT; i++)
958 func (data->ifd[i], user_data);
961 typedef struct _ByteOrderChangeData ByteOrderChangeData;
962 struct _ByteOrderChangeData {
963 ExifByteOrder old, new;
967 entry_set_byte_order (ExifEntry *e, void *data)
969 ByteOrderChangeData *d = data;
974 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
978 content_set_byte_order (ExifContent *content, void *data)
980 exif_content_foreach_entry (content, entry_set_byte_order, data);
984 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
986 ByteOrderChangeData d;
988 if (!data || (order == data->priv->order))
991 d.old = data->priv->order;
993 exif_data_foreach_content (data, content_set_byte_order, &d);
994 data->priv->order = order;
996 exif_mnote_data_set_byte_order (data->priv->md, order);
1000 exif_data_log (ExifData *data, ExifLog *log)
1004 if (!data || !data->priv) return;
1005 exif_log_unref (data->priv->log);
1006 data->priv->log = log;
1009 for (i = 0; i < EXIF_IFD_COUNT; i++)
1010 exif_content_log (data->ifd[i], log);
1013 /* Used internally within libexif */
1014 ExifLog *exif_data_get_log (ExifData *);
1016 exif_data_get_log (ExifData *data)
1018 if (!data || !data->priv) return NULL;
1019 return data->priv->log;