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;
71 ExifDataType data_type;
75 exif_data_alloc (ExifData *data, unsigned int i)
79 if (!data || !i) return NULL;
81 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)
111 if (!mem) return NULL;
113 data = exif_mem_alloc (mem, sizeof (ExifData));
114 if (!data) return (NULL);
115 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
116 if (!data->priv) { exif_mem_free (mem, data); return (NULL); }
117 data->priv->ref_count = 1;
119 data->priv->mem = mem;
122 for (i = 0; i < EXIF_IFD_COUNT; i++) {
123 data->ifd[i] = exif_content_new_mem (data->priv->mem);
125 exif_data_free (data);
128 data->ifd[i]->parent = data;
131 /* Default options */
132 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
133 exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
135 /* Default data type: none */
136 exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
142 exif_data_new_from_data (const unsigned char *data, unsigned int size)
146 edata = exif_data_new ();
147 exif_data_load_data (edata, data, size);
152 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
153 const unsigned char *d,
154 unsigned int size, unsigned int offset)
156 unsigned int s, doff;
158 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
159 entry->format = exif_get_short (d + offset + 2, data->priv->order);
160 entry->components = exif_get_long (d + offset + 4, data->priv->order);
162 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
163 "Loading entry 0x%x ('%s')...", entry->tag,
164 exif_tag_get_name (entry->tag));
167 * Size? If bigger than 4 bytes, the actual data is not
168 * in the entry but somewhere else (offset).
170 s = exif_format_get_size (entry->format) * entry->components;
174 doff = exif_get_long (d + offset + 8, data->priv->order);
182 entry->data = exif_data_alloc (data, s);
185 memcpy (entry->data, d + doff, s);
188 /* If this is the MakerNote, remember the offset */
189 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
190 if (entry->size > 6) exif_log (data->priv->log,
191 EXIF_LOG_CODE_DEBUG, "ExifData",
192 "MakerNote found (%02x %02x %02x %02x "
193 "%02x %02x %02x...).",
194 entry->data[0], entry->data[1], entry->data[2],
195 entry->data[3], entry->data[4], entry->data[5],
197 data->priv->offset_mnote = doff;
202 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
203 unsigned char **d, unsigned int *ds,
206 unsigned int doff, s;
208 if (!data || !data->priv) return;
211 * Each entry is 12 bytes long. The memory for the entry has
212 * already been allocated.
214 exif_set_short (*d + 6 + offset + 0,
215 data->priv->order, (ExifShort) e->tag);
216 exif_set_short (*d + 6 + offset + 2,
217 data->priv->order, (ExifShort) e->format);
219 #ifndef EXIF_DONT_CHANGE_MAKER_NOTE
220 /* If this is the maker note tag, update it. */
221 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
222 exif_mem_free (data->priv->mem, e->data);
225 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
226 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
227 e->components = e->size;
231 exif_set_long (*d + 6 + offset + 4,
232 data->priv->order, e->components);
235 * Size? If bigger than 4 bytes, the actual data is not in
236 * the entry but somewhere else.
238 s = exif_format_get_size (e->format) * e->components;
244 * According to the TIFF specification,
245 * the offset must be an even number. If we need to introduce
246 * a padding byte, we set it to 0.
249 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
251 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
254 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
255 if (s & 1) *(*d + *ds - 1) = '\0';
260 /* Write the data. Fill unneeded bytes with 0. */
261 memcpy (*d + 6 + doff, e->data, s);
262 if (s < 4) memset (*d + 6 + doff + s, 0, (4 - s));
266 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
267 unsigned int ds, ExifLong offset, ExifLong size)
269 if (ds < offset + size) {
270 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
271 "Bogus thumbnail offset and size: %i < %i + %i.",
272 (int) ds, (int) offset, (int) size);
275 if (data->data) exif_mem_free (data->priv->mem, data->data);
277 data->data = exif_data_alloc (data, data->size);
278 if (!data->data) return;
279 memcpy (data->data, d + offset, data->size);
283 #define CHECK_REC(i) \
285 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
286 "ExifData", "Recursive entry in IFD " \
287 "'%s' detected. Skipping...", \
288 exif_ifd_get_name (i)); \
291 if (data->ifd[(i)]->count) { \
292 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
293 "ExifData", "Attemt to load IFD " \
294 "'%s' multiple times detected. " \
296 exif_ifd_get_name (i)); \
301 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
302 const unsigned char *d,
303 unsigned int ds, unsigned int offset, unsigned int l)
305 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
311 if (!data || !data->priv) return;
312 if ((ifd < 0) || (ifd >= EXIF_IFD_COUNT)) return;
315 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
316 "Deep recursion detected!");
320 /* Read the number of entries */
321 if (offset >= ds - 1) return;
322 n = exif_get_short (d + offset, data->priv->order);
323 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
324 "Loading %i entries...", n);
327 /* Check if we have enough data. */
328 if (offset + 12 * n > ds) n = (ds - offset) / 12;
330 for (i = 0; i < n; i++) {
332 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
334 case EXIF_TAG_EXIF_IFD_POINTER:
335 case EXIF_TAG_GPS_INFO_IFD_POINTER:
336 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
337 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
338 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
339 o = exif_get_long (d + offset + 12 * i + 8,
342 case EXIF_TAG_EXIF_IFD_POINTER:
343 CHECK_REC (EXIF_IFD_EXIF);
344 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, l + 1);
346 case EXIF_TAG_GPS_INFO_IFD_POINTER:
347 CHECK_REC (EXIF_IFD_GPS);
348 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, l + 1);
350 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
351 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
352 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, l + 1);
354 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
355 thumbnail_offset = o;
356 if (thumbnail_offset && thumbnail_length)
357 exif_data_load_data_thumbnail (data, d,
358 ds, thumbnail_offset,
361 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
362 thumbnail_length = o;
363 if (thumbnail_offset && thumbnail_length)
364 exif_data_load_data_thumbnail (data, d,
365 ds, thumbnail_offset,
375 * If we don't know the tag, don't fail. It could be that new
376 * versions of the standard have defined additional tags. Note that
377 * 0 is a valid tag in the GPS IFD.
379 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
382 * Special case: Tag and format 0. That's against specification.
383 * At least up to 2.2. But Photoshop writes it anyways.
385 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
386 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
387 "Skipping empty entry at position %i in '%s'.", i,
388 exif_ifd_get_name (ifd));
391 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
392 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
393 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
394 exif_ifd_get_name (ifd));
395 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
398 entry = exif_entry_new_mem (data->priv->mem);
399 exif_data_load_data_entry (data, entry, d, ds,
401 exif_content_add_entry (data->ifd[ifd], entry);
402 exif_entry_unref (entry);
409 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
411 ExifShort tag1 = exif_get_short (p1, o);
412 ExifShort tag2 = exif_get_short (p2, o);
414 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
418 cmp_func_intel (const void *elem1, const void *elem2)
420 return cmp_func ((const unsigned char *) elem1,
421 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
425 cmp_func_motorola (const void *elem1, const void *elem2)
427 return cmp_func ((const unsigned char *) elem1,
428 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
432 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
433 unsigned char **d, unsigned int *ds,
436 unsigned int j, n_ptr = 0, n_thumb = 0;
439 if (!data || !data->priv || !ifd || !d || !ds) return;
441 for (i = 0; i < EXIF_IFD_COUNT; i++)
442 if (ifd == data->ifd[i])
444 if (i == EXIF_IFD_COUNT)
448 * Check if we need some extra entries for pointers or the thumbnail.
454 * The pointer to IFD_EXIF is in IFD_0. The pointer to
455 * IFD_INTEROPERABILITY is in IFD_EXIF.
457 if (data->ifd[EXIF_IFD_EXIF]->count ||
458 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
461 /* The pointer to IFD_GPS is in IFD_0. */
462 if (data->ifd[EXIF_IFD_GPS]->count)
471 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
478 * Allocate enough memory for all entries
479 * and the number of entries.
481 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
482 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
484 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
488 /* Save the number of entries */
489 exif_set_short (*d + 6 + offset, data->priv->order,
490 (ExifShort) (ifd->count + n_ptr + n_thumb));
493 /* Save each entry */
494 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
495 "Saving %i entries (IFD '%s', offset: %i)...",
496 ifd->count, exif_ifd_get_name (i), offset);
497 for (j = 0; j < ifd->count; j++)
498 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
500 offset += 12 * ifd->count;
502 /* Now save special entries. */
507 * The pointer to IFD_EXIF is in IFD_0.
508 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
509 * therefore, if IFD_INTEROPERABILITY is not empty, we need
510 * IFD_EXIF even if latter is empty.
512 if (data->ifd[EXIF_IFD_EXIF]->count ||
513 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
514 exif_set_short (*d + 6 + offset + 0, data->priv->order,
515 EXIF_TAG_EXIF_IFD_POINTER);
516 exif_set_short (*d + 6 + offset + 2, data->priv->order,
518 exif_set_long (*d + 6 + offset + 4, data->priv->order,
520 exif_set_long (*d + 6 + offset + 8, data->priv->order,
522 exif_data_save_data_content (data,
523 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
527 /* The pointer to IFD_GPS is in IFD_0, too. */
528 if (data->ifd[EXIF_IFD_GPS]->count) {
529 exif_set_short (*d + 6 + offset + 0, data->priv->order,
530 EXIF_TAG_GPS_INFO_IFD_POINTER);
531 exif_set_short (*d + 6 + offset + 2, data->priv->order,
533 exif_set_long (*d + 6 + offset + 4, data->priv->order,
535 exif_set_long (*d + 6 + offset + 8, data->priv->order,
537 exif_data_save_data_content (data,
538 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
546 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
549 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
550 exif_set_short (*d + 6 + offset + 0, data->priv->order,
551 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
552 exif_set_short (*d + 6 + offset + 2, data->priv->order,
554 exif_set_long (*d + 6 + offset + 4, data->priv->order,
556 exif_set_long (*d + 6 + offset + 8, data->priv->order,
558 exif_data_save_data_content (data,
559 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
568 * Information about the thumbnail (if any) is saved in
573 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
574 exif_set_short (*d + 6 + offset + 0, data->priv->order,
575 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
576 exif_set_short (*d + 6 + offset + 2, data->priv->order,
578 exif_set_long (*d + 6 + offset + 4, data->priv->order,
580 exif_set_long (*d + 6 + offset + 8, data->priv->order,
583 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
585 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
589 memcpy (*d + *ds - data->size, data->data, data->size);
592 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
593 exif_set_short (*d + 6 + offset + 0, data->priv->order,
594 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
595 exif_set_short (*d + 6 + offset + 2, data->priv->order,
597 exif_set_long (*d + 6 + offset + 4, data->priv->order,
599 exif_set_long (*d + 6 + offset + 8, data->priv->order,
609 /* Sort the directory according to TIFF specification */
610 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
611 (ifd->count + n_ptr + n_thumb), 12,
612 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
614 /* Correctly terminate the directory */
615 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
619 * We are saving IFD 0. Tell where IFD 1 starts and save
622 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
623 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
626 exif_set_long (*d + 6 + offset, data->priv->order, 0);
630 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
631 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
632 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
633 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3
634 } ExifDataTypeMakerNote;
636 static ExifDataTypeMakerNote
637 exif_data_get_type_maker_note (ExifData *d)
642 if (!d) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
644 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
645 if (!e) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
647 /* Olympus & Nikon */
648 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
649 !memcmp (e->data, "Nikon", 5)))
650 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
652 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
653 if (!em) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
656 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
657 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
659 /* Pentax & some variant of Nikon */
660 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
662 exif_entry_get_value (em, value, sizeof(value)),
664 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
666 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
669 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
672 #define LOG_TOO_SMALL \
673 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
674 _("Size of data too small to allow for EXIF data."));
677 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
678 unsigned int ds_orig)
683 const unsigned char *d = d_orig;
684 unsigned int ds = ds_orig, len;
686 if (!data || !data->priv || !d || !ds) return;
688 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
689 "Parsing %i byte(s) EXIF data...\n", ds);
692 * It can be that the data starts with the EXIF header. If it does
693 * not, search the EXIF marker.
699 if (!memcmp (d, ExifHeader, 6)) {
700 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
701 "Found EXIF header.");
704 while ((d[0] == 0xff) && ds) {
709 /* JPEG_MARKER_SOI */
710 if (d[0] == JPEG_MARKER_SOI) {
716 /* JPEG_MARKER_APP0 */
717 if (d[0] == JPEG_MARKER_APP0) {
720 l = (d[0] << 8) | d[1];
728 /* JPEG_MARKER_APP1 */
729 if (d[0] == JPEG_MARKER_APP1)
732 /* Unknown marker or data. Give up. */
733 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
734 "ExifData", _("EXIF marker not found."));
743 len = (d[0] << 8) | d[1];
744 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
745 "We have to deal with %i byte(s) of EXIF data.",
752 * Verify the exif header
753 * (offset 2, length 6).
759 if (memcmp (d, ExifHeader, 6)) {
760 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
761 "ExifData", _("EXIF header not found."));
765 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
766 "Found EXIF header.");
768 /* Byte order (offset 6, length 2) */
771 if (!memcmp (d + 6, "II", 2))
772 data->priv->order = EXIF_BYTE_ORDER_INTEL;
773 else if (!memcmp (d + 6, "MM", 2))
774 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
776 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
777 "ExifData", _("Unknown encoding."));
782 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
786 offset = exif_get_long (d + 10, data->priv->order);
787 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
788 "IFD 0 at %i.", (int) offset);
790 /* Parse the actual exif data (usually offset 14 from start) */
791 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
794 if (offset + 6 + 2 > ds) {
797 n = exif_get_short (d + 6 + offset, data->priv->order);
798 if (offset + 6 + 2 + 12 * n + 4 > ds) {
801 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
803 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
804 "IFD 1 at %i.", (int) offset);
807 if (offset > ds - 6) {
808 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
809 "ExifData", "Bogus offset.");
813 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
817 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
818 * cameras use pointers in the maker note tag that point to the
819 * space between IFDs. Here is the only place where we have access
822 switch (exif_data_get_type_maker_note (data)) {
823 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
824 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
826 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
827 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
829 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
830 data->priv->md = exif_mnote_data_canon_new (data->priv->mem);
837 * If we are able to interpret the maker note, do so.
839 if (data->priv->md) {
840 exif_mnote_data_log (data->priv->md, data->priv->log);
841 exif_mnote_data_set_byte_order (data->priv->md,
843 exif_mnote_data_set_offset (data->priv->md,
844 data->priv->offset_mnote);
845 exif_mnote_data_load (data->priv->md, d, ds);
848 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
849 exif_data_fix (data);
853 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
855 if (!data || !d || !ds)
860 *d = exif_data_alloc (data, *ds);
862 memcpy (*d, ExifHeader, 6);
864 /* Order (offset 6) */
865 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
866 memcpy (*d + 6, "II", 2);
868 memcpy (*d + 6, "MM", 2);
871 /* Fixed value (2 bytes, offset 8) */
872 exif_set_short (*d + 8, data->priv->order, 0x002a);
875 * IFD 0 offset (4 bytes, offset 10).
876 * We will start 8 bytes after the
877 * EXIF header (2 bytes for order, another 2 for the test, and
878 * 4 bytes for the IFD 0 offset make 8 bytes together).
880 exif_set_long (*d + 10, data->priv->order, 8);
882 /* Now save IFD 0. IFD 1 will be saved automatically. */
883 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
885 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
887 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
888 "Saved %i byte(s) EXIF data.", *ds);
892 exif_data_new_from_file (const char *path)
897 loader = exif_loader_new ();
898 exif_loader_write_file (loader, path);
899 edata = exif_loader_get_data (loader);
900 exif_loader_unref (loader);
906 exif_data_ref (ExifData *data)
911 data->priv->ref_count++;
915 exif_data_unref (ExifData *data)
919 data->priv->ref_count--;
920 if (!data->priv->ref_count) exif_data_free (data);
924 exif_data_free (ExifData *data)
927 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
931 for (i = 0; i < EXIF_IFD_COUNT; i++) {
933 exif_content_unref (data->ifd[i]);
939 exif_mem_free (mem, data->data);
944 if (data->priv->log) {
945 exif_log_unref (data->priv->log);
946 data->priv->log = NULL;
948 if (data->priv->md) {
949 exif_mnote_data_unref (data->priv->md);
950 data->priv->md = NULL;
952 exif_mem_free (mem, data->priv);
953 exif_mem_free (mem, data);
956 exif_mem_unref (mem);
960 exif_data_dump (ExifData *data)
967 for (i = 0; i < EXIF_IFD_COUNT; i++) {
968 if (data->ifd[i] && data->ifd[i]->count) {
969 printf ("Dumping IFD '%s'...\n",
970 exif_ifd_get_name (i));
971 exif_content_dump (data->ifd[i], 0);
976 printf ("%i byte(s) thumbnail data available.", data->size);
977 if (data->size >= 4) {
978 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
979 data->data[0], data->data[1],
980 data->data[data->size - 2],
981 data->data[data->size - 1]);
987 exif_data_get_byte_order (ExifData *data)
992 return (data->priv->order);
996 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1004 for (i = 0; i < EXIF_IFD_COUNT; i++)
1005 func (data->ifd[i], user_data);
1008 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1009 struct _ByteOrderChangeData {
1010 ExifByteOrder old, new;
1014 entry_set_byte_order (ExifEntry *e, void *data)
1016 ByteOrderChangeData *d = data;
1021 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1025 content_set_byte_order (ExifContent *content, void *data)
1027 exif_content_foreach_entry (content, entry_set_byte_order, data);
1031 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1033 ByteOrderChangeData d;
1035 if (!data || (order == data->priv->order))
1038 d.old = data->priv->order;
1040 exif_data_foreach_content (data, content_set_byte_order, &d);
1041 data->priv->order = order;
1043 exif_mnote_data_set_byte_order (data->priv->md, order);
1047 exif_data_log (ExifData *data, ExifLog *log)
1051 if (!data || !data->priv) return;
1052 exif_log_unref (data->priv->log);
1053 data->priv->log = log;
1056 for (i = 0; i < EXIF_IFD_COUNT; i++)
1057 exif_content_log (data->ifd[i], log);
1060 /* Used internally within libexif */
1061 ExifLog *exif_data_get_log (ExifData *);
1063 exif_data_get_log (ExifData *data)
1065 if (!data || !data->priv) return NULL;
1066 return data->priv->log;
1070 ExifDataOption option;
1072 const char *description;
1073 } exif_data_option[] = {
1074 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1075 N_("Ignore unknown tags when loading EXIF data.")},
1076 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1077 N_("Add, correct and remove entries to get EXIF data that follows "
1078 "the specification.")},
1083 exif_data_option_get_name (ExifDataOption o)
1087 for (i = 0; exif_data_option[i].name; i++)
1088 if (exif_data_option[i].option == o) break;
1089 return _(exif_data_option[i].name);
1093 exif_data_option_get_description (ExifDataOption o)
1097 for (i = 0; exif_data_option[i].description; i++)
1098 if (exif_data_option[i].option == o) break;
1099 return _(exif_data_option[i].description);
1103 exif_data_set_option (ExifData *d, ExifDataOption o)
1107 d->priv->options |= o;
1111 exif_data_unset_option (ExifData *d, ExifDataOption o)
1115 d->priv->options &= ~o;
1119 fix_func (ExifContent *c, void *data)
1121 switch (exif_content_get_ifd (c)) {
1123 if (c->parent->data)
1124 exif_content_fix (c);
1126 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1127 "No thumbnail but entries on thumbnail. These entries have been "
1130 exif_content_remove_entry (c, c->entries[c->count - 1]);
1134 exif_content_fix (c);
1139 exif_data_fix (ExifData *d)
1141 exif_data_foreach_content (d, fix_func, NULL);
1145 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1147 if (!d || !d->priv) return;
1149 d->priv->data_type = dt;
1153 exif_data_get_data_type (ExifData *d)
1155 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;