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>
41 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
43 #if defined(__WATCOMC__) || defined(_MSC_VER)
44 # define strncasecmp strnicmp
47 #undef JPEG_MARKER_SOI
48 #define JPEG_MARKER_SOI 0xd8
49 #undef JPEG_MARKER_APP0
50 #define JPEG_MARKER_APP0 0xe0
51 #undef JPEG_MARKER_APP1
52 #define JPEG_MARKER_APP1 0xe1
54 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
56 struct _ExifDataPrivate
65 unsigned int ref_count;
67 /* Temporarily used while loading data */
68 unsigned int offset_mnote;
70 ExifDataOption options;
74 exif_data_alloc (ExifData *data, unsigned int i)
78 if (!data || !i) return NULL;
80 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)
110 if (!mem) return NULL;
112 data = exif_mem_alloc (mem, sizeof (ExifData));
113 if (!data) return (NULL);
114 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
115 if (!data->priv) { exif_mem_free (mem, data); return (NULL); }
116 data->priv->ref_count = 1;
118 data->priv->mem = mem;
121 for (i = 0; i < EXIF_IFD_COUNT; i++) {
122 data->ifd[i] = exif_content_new_mem (data->priv->mem);
124 exif_data_free (data);
127 data->ifd[i]->parent = data;
130 /* Standard options */
131 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
132 exif_data_set_option (data, EXIF_DATA_OPTION_FIX_INVALID_FORMAT);
138 exif_data_new_from_data (const unsigned char *data, unsigned int size)
142 edata = exif_data_new ();
143 exif_data_load_data (edata, data, size);
148 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
149 const unsigned char *d,
150 unsigned int size, unsigned int offset)
152 unsigned int s, doff;
154 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
155 entry->format = exif_get_short (d + offset + 2, data->priv->order);
156 entry->components = exif_get_long (d + offset + 4, data->priv->order);
158 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
159 "Loading entry 0x%x ('%s')...", entry->tag,
160 exif_tag_get_name (entry->tag));
163 * Size? If bigger than 4 bytes, the actual data is not
164 * in the entry but somewhere else (offset).
166 s = exif_format_get_size (entry->format) * entry->components;
170 doff = exif_get_long (d + offset + 8, data->priv->order);
178 entry->data = exif_data_alloc (data, s);
181 memcpy (entry->data, d + doff, s);
184 /* If this is the MakerNote, remember the offset */
185 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
186 if (entry->size > 6) exif_log (data->priv->log,
187 EXIF_LOG_CODE_DEBUG, "ExifData",
188 "MakerNote found (%02x %02x %02x %02x "
189 "%02x %02x %02x...).",
190 entry->data[0], entry->data[1], entry->data[2],
191 entry->data[3], entry->data[4], entry->data[5],
193 data->priv->offset_mnote = doff;
196 if (data->priv->options & EXIF_DATA_OPTION_FIX_INVALID_FORMAT)
197 exif_entry_fix (entry);
201 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
202 unsigned char **d, unsigned int *ds,
205 unsigned int doff, s;
207 if (!data || !data->priv) return;
210 * Each entry is 12 bytes long. The memory for the entry has
211 * already been allocated.
213 exif_set_short (*d + 6 + offset + 0,
214 data->priv->order, (ExifShort) e->tag);
215 exif_set_short (*d + 6 + offset + 2,
216 data->priv->order, (ExifShort) e->format);
218 #ifndef EXIF_DONT_CHANGE_MAKER_NOTE
219 /* If this is the maker note tag, update it. */
220 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
221 exif_mem_free (data->priv->mem, e->data);
224 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
225 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
226 e->components = e->size;
230 exif_set_long (*d + 6 + offset + 4,
231 data->priv->order, e->components);
234 * Size? If bigger than 4 bytes, the actual data is not in
235 * the entry but somewhere else.
237 s = exif_format_get_size (e->format) * e->components;
243 * According to the TIFF specification,
244 * the offset must be an even number. If we need to introduce
245 * a padding byte, we set it to 0.
248 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
250 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
253 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
254 if (s & 1) *(*d + *ds - 1) = '\0';
259 /* Write the data. Fill unneeded bytes with 0. */
260 memcpy (*d + 6 + doff, e->data, s);
261 if (s < 4) memset (*d + 6 + doff + s, 0, (4 - s));
265 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
266 unsigned int ds, ExifLong offset, ExifLong size)
268 if (ds < offset + size) {
269 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
270 "Bogus thumbnail offset and size: %i < %i + %i.",
271 (int) ds, (int) offset, (int) size);
274 if (data->data) exif_mem_free (data->priv->mem, data->data);
276 data->data = exif_data_alloc (data, data->size);
277 if (!data->data) return;
278 memcpy (data->data, d + offset, data->size);
282 #define CHECK_REC(i) \
283 if (data->ifd[(i)] == ifd) { \
284 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
285 "ExifData", "Recursive entry in IFD " \
286 "'%s' detected. Skipping...", \
287 exif_ifd_get_name (i)); \
290 if (data->ifd[(i)]->count) { \
291 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
292 "ExifData", "Attemt to load IFD " \
293 "'%s' multiple times detected. " \
295 exif_ifd_get_name (i)); \
300 exif_data_load_data_content (ExifData *data, ExifContent *ifd,
301 const unsigned char *d,
302 unsigned int ds, unsigned int offset)
304 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
310 if (!data || !data->priv) return;
312 /* Read the number of entries */
313 if (offset >= ds - 1) return;
314 n = exif_get_short (d + offset, data->priv->order);
315 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
316 "Loading %i entries...", n);
319 /* Check if we have enough data. */
320 if (offset + 12 * n > ds) n = (ds - offset) / 12;
322 for (i = 0; i < n; i++) {
324 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
326 case EXIF_TAG_EXIF_IFD_POINTER:
327 case EXIF_TAG_GPS_INFO_IFD_POINTER:
328 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
329 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
330 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
331 o = exif_get_long (d + offset + 12 * i + 8,
334 case EXIF_TAG_EXIF_IFD_POINTER:
335 CHECK_REC (EXIF_IFD_EXIF);
336 exif_data_load_data_content (data,
337 data->ifd[EXIF_IFD_EXIF], d, ds, o);
339 case EXIF_TAG_GPS_INFO_IFD_POINTER:
340 CHECK_REC (EXIF_IFD_GPS);
341 exif_data_load_data_content (data,
342 data->ifd[EXIF_IFD_GPS], d, ds, o);
344 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
345 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
346 exif_data_load_data_content (data,
347 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds, o);
349 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
350 thumbnail_offset = o;
351 if (thumbnail_offset && thumbnail_length)
352 exif_data_load_data_thumbnail (data, d,
353 ds, thumbnail_offset,
356 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
357 thumbnail_length = o;
358 if (thumbnail_offset && thumbnail_length)
359 exif_data_load_data_thumbnail (data, d,
360 ds, thumbnail_offset,
370 * If we don't know the tag, don't fail. It could be that new
371 * versions of the standard have defined additional tags. Note that
372 * 0 is a valid tag in the GPS IFD.
374 if (!exif_tag_get_name (tag)) {
375 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
376 "Unknown tag %x (entry %i). Please report this tag "
377 "to <libexif-devel@lists.sourceforge.net>.", tag, i);
378 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
381 entry = exif_entry_new_mem (data->priv->mem);
382 exif_data_load_data_entry (data, entry, d, ds,
384 exif_content_add_entry (ifd, entry);
385 exif_entry_unref (entry);
392 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
394 ExifShort tag1 = exif_get_short (p1, o);
395 ExifShort tag2 = exif_get_short (p2, o);
397 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
401 cmp_func_intel (const void *elem1, const void *elem2)
403 return cmp_func ((const unsigned char *) elem1,
404 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
408 cmp_func_motorola (const void *elem1, const void *elem2)
410 return cmp_func ((const unsigned char *) elem1,
411 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
415 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
416 unsigned char **d, unsigned int *ds,
419 unsigned int j, n_ptr = 0, n_thumb = 0;
422 if (!data || !data->priv || !ifd || !d || !ds) return;
424 for (i = 0; i < EXIF_IFD_COUNT; i++)
425 if (ifd == data->ifd[i])
427 if (i == EXIF_IFD_COUNT)
431 * Check if we need some extra entries for pointers or the thumbnail.
437 * The pointer to IFD_EXIF is in IFD_0. The pointer to
438 * IFD_INTEROPERABILITY is in IFD_EXIF.
440 if (data->ifd[EXIF_IFD_EXIF]->count ||
441 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
444 /* The pointer to IFD_GPS is in IFD_0. */
445 if (data->ifd[EXIF_IFD_GPS]->count)
454 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
461 * Allocate enough memory for all entries
462 * and the number of entries.
464 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
465 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
467 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
471 /* Save the number of entries */
472 exif_set_short (*d + 6 + offset, data->priv->order,
473 (ExifShort) (ifd->count + n_ptr + n_thumb));
476 /* Save each entry */
477 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
478 "Saving %i entries (IFD '%s', offset: %i)...",
479 ifd->count, exif_ifd_get_name (i), offset);
480 for (j = 0; j < ifd->count; j++)
481 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
483 offset += 12 * ifd->count;
485 /* Now save special entries. */
490 * The pointer to IFD_EXIF is in IFD_0.
491 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
492 * therefore, if IFD_INTEROPERABILITY is not empty, we need
493 * IFD_EXIF even if latter is empty.
495 if (data->ifd[EXIF_IFD_EXIF]->count ||
496 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
497 exif_set_short (*d + 6 + offset + 0, data->priv->order,
498 EXIF_TAG_EXIF_IFD_POINTER);
499 exif_set_short (*d + 6 + offset + 2, data->priv->order,
501 exif_set_long (*d + 6 + offset + 4, data->priv->order,
503 exif_set_long (*d + 6 + offset + 8, data->priv->order,
505 exif_data_save_data_content (data,
506 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
510 /* The pointer to IFD_GPS is in IFD_0, too. */
511 if (data->ifd[EXIF_IFD_GPS]->count) {
512 exif_set_short (*d + 6 + offset + 0, data->priv->order,
513 EXIF_TAG_GPS_INFO_IFD_POINTER);
514 exif_set_short (*d + 6 + offset + 2, data->priv->order,
516 exif_set_long (*d + 6 + offset + 4, data->priv->order,
518 exif_set_long (*d + 6 + offset + 8, data->priv->order,
520 exif_data_save_data_content (data,
521 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
529 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
532 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
533 exif_set_short (*d + 6 + offset + 0, data->priv->order,
534 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
535 exif_set_short (*d + 6 + offset + 2, data->priv->order,
537 exif_set_long (*d + 6 + offset + 4, data->priv->order,
539 exif_set_long (*d + 6 + offset + 8, data->priv->order,
541 exif_data_save_data_content (data,
542 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
551 * Information about the thumbnail (if any) is saved in
556 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
557 exif_set_short (*d + 6 + offset + 0, data->priv->order,
558 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
559 exif_set_short (*d + 6 + offset + 2, data->priv->order,
561 exif_set_long (*d + 6 + offset + 4, data->priv->order,
563 exif_set_long (*d + 6 + offset + 8, data->priv->order,
566 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
568 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
572 memcpy (*d + *ds - data->size, data->data, data->size);
575 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
576 exif_set_short (*d + 6 + offset + 0, data->priv->order,
577 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
578 exif_set_short (*d + 6 + offset + 2, data->priv->order,
580 exif_set_long (*d + 6 + offset + 4, data->priv->order,
582 exif_set_long (*d + 6 + offset + 8, data->priv->order,
592 /* Sort the directory according to TIFF specification */
593 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
594 (ifd->count + n_ptr + n_thumb), 12,
595 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
597 /* Correctly terminate the directory */
598 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
602 * We are saving IFD 0. Tell where IFD 1 starts and save
605 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
606 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
609 exif_set_long (*d + 6 + offset, data->priv->order, 0);
613 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
614 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
615 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
616 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3
617 } ExifDataTypeMakerNote;
619 static ExifDataTypeMakerNote
620 exif_data_get_type_maker_note (ExifData *d)
625 if (!d) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
627 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
628 if (!e) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
630 /* Olympus & Nikon */
631 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
632 !memcmp (e->data, "Nikon", 5)))
633 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
635 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
636 if (!em) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
639 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
640 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
642 /* Pentax & some variant of Nikon */
643 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
645 exif_entry_get_value (em, value, sizeof(value)),
647 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
649 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
652 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
655 #define LOG_TOO_SMALL \
656 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
657 _("Size of data too small to allow for EXIF data."));
660 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
661 unsigned int ds_orig)
666 const unsigned char *d = d_orig;
667 unsigned int ds = ds_orig, len;
669 if (!data || !data->priv || !d || !ds) return;
671 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
672 "Parsing %i byte(s) EXIF data...\n", ds);
675 * It can be that the data starts with the EXIF header. If it does
676 * not, search the EXIF marker.
682 if (!memcmp (d, ExifHeader, 6)) {
683 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
684 "Found EXIF header.");
687 while ((d[0] == 0xff) && ds) {
692 /* JPEG_MARKER_SOI */
693 if (d[0] == JPEG_MARKER_SOI) {
699 /* JPEG_MARKER_APP0 */
700 if (d[0] == JPEG_MARKER_APP0) {
703 l = (d[0] << 8) | d[1];
711 /* JPEG_MARKER_APP1 */
712 if (d[0] == JPEG_MARKER_APP1)
715 /* Unknown marker or data. Give up. */
716 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
717 "ExifData", _("EXIF marker not found."));
726 len = (d[0] << 8) | d[1];
727 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
728 "We have to deal with %i byte(s) of EXIF data.",
735 * Verify the exif header
736 * (offset 2, length 6).
742 if (memcmp (d, ExifHeader, 6)) {
743 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
744 "ExifData", _("EXIF header not found."));
748 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
749 "Found EXIF header.");
751 /* Byte order (offset 6, length 2) */
754 if (!memcmp (d + 6, "II", 2))
755 data->priv->order = EXIF_BYTE_ORDER_INTEL;
756 else if (!memcmp (d + 6, "MM", 2))
757 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
759 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
760 "ExifData", _("Unknown encoding."));
765 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
769 offset = exif_get_long (d + 10, data->priv->order);
770 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
771 "IFD 0 at %i.", (int) offset);
773 /* Parse the actual exif data (usually offset 14 from start) */
774 exif_data_load_data_content (data, data->ifd[EXIF_IFD_0], d + 6,
778 if (offset + 6 + 2 > ds) {
781 n = exif_get_short (d + 6 + offset, data->priv->order);
782 if (offset + 6 + 2 + 12 * n + 4 > ds) {
785 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
787 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
788 "IFD 1 at %i.", (int) offset);
791 if (offset > ds - 6) {
792 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
793 "ExifData", "Bogus offset.");
797 exif_data_load_data_content (data, data->ifd[EXIF_IFD_1], d + 6,
802 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
803 * cameras use pointers in the maker note tag that point to the
804 * space between IFDs. Here is the only place where we have access
807 switch (exif_data_get_type_maker_note (data)) {
808 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
809 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
811 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
812 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
814 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
815 data->priv->md = exif_mnote_data_canon_new (data->priv->mem);
822 * If we are able to interpret the maker note, do so.
824 if (data->priv->md) {
825 exif_mnote_data_log (data->priv->md, data->priv->log);
826 exif_mnote_data_set_byte_order (data->priv->md,
828 exif_mnote_data_set_offset (data->priv->md,
829 data->priv->offset_mnote);
830 exif_mnote_data_load (data->priv->md, d, ds);
835 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
837 if (!data || !d || !ds)
842 *d = exif_data_alloc (data, *ds);
844 memcpy (*d, ExifHeader, 6);
846 /* Order (offset 6) */
847 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
848 memcpy (*d + 6, "II", 2);
850 memcpy (*d + 6, "MM", 2);
853 /* Fixed value (2 bytes, offset 8) */
854 exif_set_short (*d + 8, data->priv->order, 0x002a);
857 * IFD 0 offset (4 bytes, offset 10).
858 * We will start 8 bytes after the
859 * EXIF header (2 bytes for order, another 2 for the test, and
860 * 4 bytes for the IFD 0 offset make 8 bytes together).
862 exif_set_long (*d + 10, data->priv->order, 8);
864 /* Now save IFD 0. IFD 1 will be saved automatically. */
865 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
867 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
869 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
870 "Saved %i byte(s) EXIF data.", *ds);
874 exif_data_new_from_file (const char *path)
879 loader = exif_loader_new ();
880 exif_loader_write_file (loader, path);
881 edata = exif_loader_get_data (loader);
882 exif_loader_unref (loader);
888 exif_data_ref (ExifData *data)
893 data->priv->ref_count++;
897 exif_data_unref (ExifData *data)
901 data->priv->ref_count--;
902 if (!data->priv->ref_count) exif_data_free (data);
906 exif_data_free (ExifData *data)
909 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
913 for (i = 0; i < EXIF_IFD_COUNT; i++) {
915 exif_content_unref (data->ifd[i]);
921 exif_mem_free (mem, data->data);
926 if (data->priv->log) {
927 exif_log_unref (data->priv->log);
928 data->priv->log = NULL;
930 if (data->priv->md) {
931 exif_mnote_data_unref (data->priv->md);
932 data->priv->md = NULL;
934 exif_mem_free (mem, data->priv);
935 exif_mem_free (mem, data);
938 exif_mem_unref (mem);
942 exif_data_dump (ExifData *data)
949 for (i = 0; i < EXIF_IFD_COUNT; i++) {
950 if (data->ifd[i] && data->ifd[i]->count) {
951 printf ("Dumping IFD '%s'...\n",
952 exif_ifd_get_name (i));
953 exif_content_dump (data->ifd[i], 0);
958 printf ("%i byte(s) thumbnail data available.", data->size);
959 if (data->size >= 4) {
960 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
961 data->data[0], data->data[1],
962 data->data[data->size - 2],
963 data->data[data->size - 1]);
969 exif_data_get_byte_order (ExifData *data)
974 return (data->priv->order);
978 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
986 for (i = 0; i < EXIF_IFD_COUNT; i++)
987 func (data->ifd[i], user_data);
990 typedef struct _ByteOrderChangeData ByteOrderChangeData;
991 struct _ByteOrderChangeData {
992 ExifByteOrder old, new;
996 entry_set_byte_order (ExifEntry *e, void *data)
998 ByteOrderChangeData *d = data;
1003 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1007 content_set_byte_order (ExifContent *content, void *data)
1009 exif_content_foreach_entry (content, entry_set_byte_order, data);
1013 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1015 ByteOrderChangeData d;
1017 if (!data || (order == data->priv->order))
1020 d.old = data->priv->order;
1022 exif_data_foreach_content (data, content_set_byte_order, &d);
1023 data->priv->order = order;
1025 exif_mnote_data_set_byte_order (data->priv->md, order);
1029 exif_data_log (ExifData *data, ExifLog *log)
1033 if (!data || !data->priv) return;
1034 exif_log_unref (data->priv->log);
1035 data->priv->log = log;
1038 for (i = 0; i < EXIF_IFD_COUNT; i++)
1039 exif_content_log (data->ifd[i], log);
1042 /* Used internally within libexif */
1043 ExifLog *exif_data_get_log (ExifData *);
1045 exif_data_get_log (ExifData *data)
1047 if (!data || !data->priv) return NULL;
1048 return data->priv->log;
1052 ExifDataOption option;
1054 const char *description;
1055 } exif_data_option[] = {
1056 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1057 N_("Ignore unknown tags when loading EXIF data.")},
1058 {EXIF_DATA_OPTION_FIX_INVALID_FORMAT, N_("Fix invalid format"),
1059 N_("Automatically fix the format of entries "
1060 "that are not in the correct format.")},
1065 exif_data_option_get_name (ExifDataOption o)
1069 for (i = 0; exif_data_option[i].name; i++)
1070 if (exif_data_option[i].option == o) break;
1071 return _(exif_data_option[i].name);
1075 exif_data_option_get_description (ExifDataOption o)
1079 for (i = 0; exif_data_option[i].description; i++)
1080 if (exif_data_option[i].option == o) break;
1081 return _(exif_data_option[i].description);
1085 exif_data_set_option (ExifData *d, ExifDataOption o)
1089 d->priv->options |= o;
1093 exif_data_unset_option (ExifData *d, ExifDataOption o)
1097 d->priv->options &= ~o;