3 * Copyright © 2001 Lutz Müller <lutz@users.sourceforge.net>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
23 #include <libexif/exif-mnote-data.h>
24 #include <libexif/exif-data.h>
25 #include <libexif/exif-ifd.h>
26 #include <libexif/exif-mnote-data-priv.h>
27 #include <libexif/exif-utils.h>
28 #include <libexif/exif-loader.h>
29 #include <libexif/exif-log.h>
30 #include <libexif/i18n.h>
31 #include <libexif/exif-system.h>
33 #include <libexif/canon/exif-mnote-data-canon.h>
34 #include <libexif/fuji/exif-mnote-data-fuji.h>
35 #include <libexif/olympus/exif-mnote-data-olympus.h>
36 #include <libexif/pentax/exif-mnote-data-pentax.h>
42 #if defined(__WATCOMC__) || defined(_MSC_VER)
43 # define strncasecmp strnicmp
46 #undef JPEG_MARKER_SOI
47 #define JPEG_MARKER_SOI 0xd8
48 #undef JPEG_MARKER_APP0
49 #define JPEG_MARKER_APP0 0xe0
50 #undef JPEG_MARKER_APP1
51 #define JPEG_MARKER_APP1 0xe1
53 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
55 struct _ExifDataPrivate
64 unsigned int ref_count;
66 /* Temporarily used while loading data */
67 unsigned int offset_mnote;
69 ExifDataOption options;
70 ExifDataType data_type;
74 exif_data_alloc (ExifData *data, unsigned int i)
81 d = exif_mem_alloc (data->priv->mem, i);
85 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
90 exif_data_get_mnote_data (ExifData *d)
92 return (d && d->priv) ? d->priv->md : NULL;
98 ExifMem *mem = exif_mem_new_default ();
99 ExifData *d = exif_data_new_mem (mem);
101 exif_mem_unref (mem);
107 exif_data_new_mem (ExifMem *mem)
115 data = exif_mem_alloc (mem, sizeof (ExifData));
118 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
120 exif_mem_free (mem, data);
123 data->priv->ref_count = 1;
125 data->priv->mem = mem;
128 for (i = 0; i < EXIF_IFD_COUNT; i++) {
129 data->ifd[i] = exif_content_new_mem (data->priv->mem);
131 exif_data_free (data);
134 data->ifd[i]->parent = data;
137 /* Default options */
138 #ifndef NO_VERBOSE_TAG_STRINGS
140 * When the tag list is compiled away, setting this option prevents
141 * any tags from being loaded
143 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
145 exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
147 /* Default data type: none */
148 exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
154 exif_data_new_from_data (const unsigned char *data, unsigned int size)
158 edata = exif_data_new ();
159 exif_data_load_data (edata, data, size);
164 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
165 const unsigned char *d,
166 unsigned int size, unsigned int offset)
168 unsigned int s, doff;
170 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
171 entry->format = exif_get_short (d + offset + 2, data->priv->order);
172 entry->components = exif_get_long (d + offset + 4, data->priv->order);
174 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
175 "Loading entry 0x%x ('%s')...", entry->tag,
176 exif_tag_get_name (entry->tag));
178 /* {0,1,2,4,8} x { 0x00000000 .. 0xffffffff }
179 * -> { 0x000000000 .. 0x7fffffff8 } */
180 s = exif_format_get_size(entry->format) * entry->components;
181 if (s < entry->components) {
187 * Size? If bigger than 4 bytes, the actual data is not
188 * in the entry but somewhere else (offset).
191 doff = exif_get_long (d + offset + 8, data->priv->order);
196 if ((doff + s < doff) || (doff + s < s))
201 entry->data = exif_data_alloc (data, s);
204 memcpy (entry->data, d + doff, s);
206 /* FIXME: What do our callers do if (entry->data == NULL)? */
207 EXIF_LOG_NO_MEMORY(data->priv->log, "ExifData", s);
210 /* If this is the MakerNote, remember the offset */
211 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
213 exif_log (data->priv->log,
214 EXIF_LOG_CODE_DEBUG, "ExifData",
215 "MakerNote found with NULL data");
216 } else if (entry->size > 6) {
217 exif_log (data->priv->log,
218 EXIF_LOG_CODE_DEBUG, "ExifData",
219 "MakerNote found (%02x %02x %02x %02x "
220 "%02x %02x %02x...).",
221 entry->data[0], entry->data[1], entry->data[2],
222 entry->data[3], entry->data[4], entry->data[5],
225 data->priv->offset_mnote = doff;
231 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
232 unsigned char **d, unsigned int *ds,
235 unsigned int doff, s;
237 if (!data || !data->priv)
241 * Each entry is 12 bytes long. The memory for the entry has
242 * already been allocated.
244 exif_set_short (*d + 6 + offset + 0,
245 data->priv->order, (ExifShort) e->tag);
246 exif_set_short (*d + 6 + offset + 2,
247 data->priv->order, (ExifShort) e->format);
249 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
250 /* If this is the maker note tag, update it. */
251 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
252 exif_mem_free (data->priv->mem, e->data);
255 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
256 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
257 e->components = e->size;
261 exif_set_long (*d + 6 + offset + 4,
262 data->priv->order, e->components);
265 * Size? If bigger than 4 bytes, the actual data is not in
266 * the entry but somewhere else.
268 s = exif_format_get_size (e->format) * e->components;
274 * According to the TIFF specification,
275 * the offset must be an even number. If we need to introduce
276 * a padding byte, we set it to 0.
280 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
282 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
285 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
287 *(*d + *ds - 1) = '\0';
292 /* Write the data. Fill unneeded bytes with 0. */
293 memcpy (*d + 6 + doff, e->data, s);
295 memset (*d + 6 + doff + s, 0, (4 - s));
299 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
300 unsigned int ds, ExifLong offset, ExifLong size)
302 if ((ds < offset + size) || (offset > ds)) {
303 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
304 "Bogus thumbnail offset (%u) or size (%u).",
309 exif_mem_free (data->priv->mem, data->data);
311 data->data = exif_data_alloc (data, data->size);
314 memcpy (data->data, d + offset, data->size);
318 #define CHECK_REC(i) \
320 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
321 "ExifData", "Recursive entry in IFD " \
322 "'%s' detected. Skipping...", \
323 exif_ifd_get_name (i)); \
326 if (data->ifd[(i)]->count) { \
327 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
328 "ExifData", "Attempt to load IFD " \
329 "'%s' multiple times detected. " \
331 exif_ifd_get_name (i)); \
336 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
337 const unsigned char *d,
338 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
340 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
346 if (!data || !data->priv)
349 /* check for valid ExifIfd enum range */
350 if (( ((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
353 if (recursion_depth > 150) {
354 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
355 "Deep recursion detected!");
359 /* Read the number of entries */
360 if (offset >= ds - 1)
362 n = exif_get_short (d + offset, data->priv->order);
363 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
364 "Loading %i entries...", n);
367 /* Check if we have enough data. */
368 if (offset + 12 * n > ds)
369 n = (ds - offset) / 12;
371 for (i = 0; i < n; i++) {
373 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
375 case EXIF_TAG_EXIF_IFD_POINTER:
376 case EXIF_TAG_GPS_INFO_IFD_POINTER:
377 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
378 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
379 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
380 o = exif_get_long (d + offset + 12 * i + 8,
383 case EXIF_TAG_EXIF_IFD_POINTER:
384 CHECK_REC (EXIF_IFD_EXIF);
385 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
387 case EXIF_TAG_GPS_INFO_IFD_POINTER:
388 CHECK_REC (EXIF_IFD_GPS);
389 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
391 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
392 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
393 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
395 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
396 thumbnail_offset = o;
397 if (thumbnail_offset && thumbnail_length)
398 exif_data_load_data_thumbnail (data, d,
399 ds, thumbnail_offset,
402 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
403 thumbnail_length = o;
404 if (thumbnail_offset && thumbnail_length)
405 exif_data_load_data_thumbnail (data, d,
406 ds, thumbnail_offset,
416 * If we don't know the tag, don't fail. It could be that new
417 * versions of the standard have defined additional tags. Note that
418 * 0 is a valid tag in the GPS IFD.
420 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
423 * Special case: Tag and format 0. That's against specification.
424 * At least up to 2.2. But Photoshop writes it anyways.
426 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
427 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
428 "Skipping empty entry at position %i in '%s'.", i,
429 exif_ifd_get_name (ifd));
432 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
433 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
434 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
435 exif_ifd_get_name (ifd));
436 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
439 entry = exif_entry_new_mem (data->priv->mem);
440 if (exif_data_load_data_entry (data, entry, d, ds,
442 exif_content_add_entry (data->ifd[ifd], entry);
443 exif_entry_unref (entry);
450 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
452 ExifShort tag1 = exif_get_short (p1, o);
453 ExifShort tag2 = exif_get_short (p2, o);
455 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
459 cmp_func_intel (const void *elem1, const void *elem2)
461 return cmp_func ((const unsigned char *) elem1,
462 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
466 cmp_func_motorola (const void *elem1, const void *elem2)
468 return cmp_func ((const unsigned char *) elem1,
469 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
473 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
474 unsigned char **d, unsigned int *ds,
477 unsigned int j, n_ptr = 0, n_thumb = 0;
480 if (!data || !data->priv || !ifd || !d || !ds)
483 for (i = 0; i < EXIF_IFD_COUNT; i++)
484 if (ifd == data->ifd[i])
486 if (i == EXIF_IFD_COUNT)
490 * Check if we need some extra entries for pointers or the thumbnail.
496 * The pointer to IFD_EXIF is in IFD_0. The pointer to
497 * IFD_INTEROPERABILITY is in IFD_EXIF.
499 if (data->ifd[EXIF_IFD_EXIF]->count ||
500 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
503 /* The pointer to IFD_GPS is in IFD_0. */
504 if (data->ifd[EXIF_IFD_GPS]->count)
513 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
520 * Allocate enough memory for all entries
521 * and the number of entries.
523 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
524 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
526 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
530 /* Save the number of entries */
531 exif_set_short (*d + 6 + offset, data->priv->order,
532 (ExifShort) (ifd->count + n_ptr + n_thumb));
535 /* Save each entry */
536 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
537 "Saving %i entries (IFD '%s', offset: %i)...",
538 ifd->count, exif_ifd_get_name (i), offset);
539 for (j = 0; j < ifd->count; j++)
540 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
542 offset += 12 * ifd->count;
544 /* Now save special entries. */
549 * The pointer to IFD_EXIF is in IFD_0.
550 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
551 * therefore, if IFD_INTEROPERABILITY is not empty, we need
552 * IFD_EXIF even if latter is empty.
554 if (data->ifd[EXIF_IFD_EXIF]->count ||
555 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
556 exif_set_short (*d + 6 + offset + 0, data->priv->order,
557 EXIF_TAG_EXIF_IFD_POINTER);
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,
564 exif_data_save_data_content (data,
565 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
569 /* The pointer to IFD_GPS is in IFD_0, too. */
570 if (data->ifd[EXIF_IFD_GPS]->count) {
571 exif_set_short (*d + 6 + offset + 0, data->priv->order,
572 EXIF_TAG_GPS_INFO_IFD_POINTER);
573 exif_set_short (*d + 6 + offset + 2, data->priv->order,
575 exif_set_long (*d + 6 + offset + 4, data->priv->order,
577 exif_set_long (*d + 6 + offset + 8, data->priv->order,
579 exif_data_save_data_content (data,
580 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
588 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
591 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
592 exif_set_short (*d + 6 + offset + 0, data->priv->order,
593 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
594 exif_set_short (*d + 6 + offset + 2, data->priv->order,
596 exif_set_long (*d + 6 + offset + 4, data->priv->order,
598 exif_set_long (*d + 6 + offset + 8, data->priv->order,
600 exif_data_save_data_content (data,
601 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
610 * Information about the thumbnail (if any) is saved in
615 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
616 exif_set_short (*d + 6 + offset + 0, data->priv->order,
617 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
618 exif_set_short (*d + 6 + offset + 2, data->priv->order,
620 exif_set_long (*d + 6 + offset + 4, data->priv->order,
622 exif_set_long (*d + 6 + offset + 8, data->priv->order,
625 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
627 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
631 memcpy (*d + *ds - data->size, data->data, data->size);
634 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
635 exif_set_short (*d + 6 + offset + 0, data->priv->order,
636 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
637 exif_set_short (*d + 6 + offset + 2, data->priv->order,
639 exif_set_long (*d + 6 + offset + 4, data->priv->order,
641 exif_set_long (*d + 6 + offset + 8, data->priv->order,
651 /* Sort the directory according to TIFF specification */
652 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
653 (ifd->count + n_ptr + n_thumb), 12,
654 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
656 /* Correctly terminate the directory */
657 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
661 * We are saving IFD 0. Tell where IFD 1 starts and save
664 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
665 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
668 exif_set_long (*d + 6 + offset, data->priv->order, 0);
672 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
673 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
674 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
675 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
676 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
677 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5,
678 EXIF_DATA_TYPE_MAKER_NOTE_FUJI = 6
679 } ExifDataTypeMakerNote;
681 static ExifDataTypeMakerNote
682 exif_data_get_type_maker_note (ExifData *d)
688 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
690 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
692 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
694 /* Olympus & Nikon & Sanyo */
695 if ((e->size >= 8) && ( !memcmp (e->data, "OLYMP", 6) ||
696 !memcmp (e->data, "OLYMPUS", 8) ||
697 !memcmp (e->data, "SANYO", 6) ||
698 !memcmp (e->data, "Nikon", 6)))
699 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
701 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
703 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
706 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
707 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
709 /* Pentax & some variant of Nikon */
710 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
712 exif_entry_get_value (em, value, sizeof(value)),
714 return EXIF_DATA_TYPE_MAKER_NOTE_NIKON;
716 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
718 if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
719 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
721 if ((e->size >= 8) && !memcmp (e->data, "QVC", 4)) {
722 return EXIF_DATA_TYPE_MAKER_NOTE_CASIO;
724 if ((e->size >= 12) && !memcmp (e->data, "FUJIFILM", 8)) {
725 return EXIF_DATA_TYPE_MAKER_NOTE_FUJI;
728 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
731 #define LOG_TOO_SMALL \
732 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
733 _("Size of data too small to allow for EXIF data."));
736 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
737 unsigned int ds_orig)
742 const unsigned char *d = d_orig;
743 unsigned int ds = ds_orig, len;
745 if (!data || !data->priv || !d || !ds)
748 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
749 "Parsing %i byte(s) EXIF data...\n", ds);
752 * It can be that the data starts with the EXIF header. If it does
753 * not, search the EXIF marker.
759 if (!memcmp (d, ExifHeader, 6)) {
760 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
761 "Found EXIF header.");
764 while ((d[0] == 0xff) && ds) {
769 /* JPEG_MARKER_SOI */
770 if (d[0] == JPEG_MARKER_SOI) {
776 /* JPEG_MARKER_APP0 */
777 if (d[0] == JPEG_MARKER_APP0) {
780 l = (d[0] << 8) | d[1];
788 /* JPEG_MARKER_APP1 */
789 if (d[0] == JPEG_MARKER_APP1)
792 /* Unknown marker or data. Give up. */
793 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
794 "ExifData", _("EXIF marker not found."));
803 len = (d[0] << 8) | d[1];
804 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
805 "We have to deal with %i byte(s) of EXIF data.",
812 * Verify the exif header
813 * (offset 2, length 6).
819 if (memcmp (d, ExifHeader, 6)) {
820 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
821 "ExifData", _("EXIF header not found."));
825 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
826 "Found EXIF header.");
828 /* Byte order (offset 6, length 2) */
831 if (!memcmp (d + 6, "II", 2))
832 data->priv->order = EXIF_BYTE_ORDER_INTEL;
833 else if (!memcmp (d + 6, "MM", 2))
834 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
836 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
837 "ExifData", _("Unknown encoding."));
842 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
846 offset = exif_get_long (d + 10, data->priv->order);
847 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
848 "IFD 0 at %i.", (int) offset);
850 /* Parse the actual exif data (usually offset 14 from start) */
851 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
854 if (offset + 6 + 2 > ds) {
857 n = exif_get_short (d + 6 + offset, data->priv->order);
858 if (offset + 6 + 2 + 12 * n + 4 > ds) {
861 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
863 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
864 "IFD 1 at %i.", (int) offset);
867 if (offset > ds - 6) {
868 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
869 "ExifData", "Bogus offset of IFD1.");
871 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
876 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
877 * cameras use pointers in the maker note tag that point to the
878 * space between IFDs. Here is the only place where we have access
881 switch (exif_data_get_type_maker_note (data)) {
882 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
883 case EXIF_DATA_TYPE_MAKER_NOTE_NIKON:
884 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
886 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
887 case EXIF_DATA_TYPE_MAKER_NOTE_CASIO:
888 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
890 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
891 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
893 case EXIF_DATA_TYPE_MAKER_NOTE_FUJI:
894 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
901 * If we are able to interpret the maker note, do so.
903 if (data->priv->md) {
904 exif_mnote_data_log (data->priv->md, data->priv->log);
905 exif_mnote_data_set_byte_order (data->priv->md,
907 exif_mnote_data_set_offset (data->priv->md,
908 data->priv->offset_mnote);
909 exif_mnote_data_load (data->priv->md, d, ds);
912 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
913 exif_data_fix (data);
917 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
920 *ds = 0; /* This means something went wrong */
922 if (!data || !d || !ds)
927 *d = exif_data_alloc (data, *ds);
932 memcpy (*d, ExifHeader, 6);
934 /* Order (offset 6) */
935 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
936 memcpy (*d + 6, "II", 2);
938 memcpy (*d + 6, "MM", 2);
941 /* Fixed value (2 bytes, offset 8) */
942 exif_set_short (*d + 8, data->priv->order, 0x002a);
945 * IFD 0 offset (4 bytes, offset 10).
946 * We will start 8 bytes after the
947 * EXIF header (2 bytes for order, another 2 for the test, and
948 * 4 bytes for the IFD 0 offset make 8 bytes together).
950 exif_set_long (*d + 10, data->priv->order, 8);
952 /* Now save IFD 0. IFD 1 will be saved automatically. */
953 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
955 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
957 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
958 "Saved %i byte(s) EXIF data.", *ds);
962 exif_data_new_from_file (const char *path)
967 loader = exif_loader_new ();
968 exif_loader_write_file (loader, path);
969 edata = exif_loader_get_data (loader);
970 exif_loader_unref (loader);
976 exif_data_ref (ExifData *data)
981 data->priv->ref_count++;
985 exif_data_unref (ExifData *data)
990 data->priv->ref_count--;
991 if (!data->priv->ref_count)
992 exif_data_free (data);
996 exif_data_free (ExifData *data)
999 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
1004 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1006 exif_content_unref (data->ifd[i]);
1007 data->ifd[i] = NULL;
1012 exif_mem_free (mem, data->data);
1017 if (data->priv->log) {
1018 exif_log_unref (data->priv->log);
1019 data->priv->log = NULL;
1021 if (data->priv->md) {
1022 exif_mnote_data_unref (data->priv->md);
1023 data->priv->md = NULL;
1025 exif_mem_free (mem, data->priv);
1026 exif_mem_free (mem, data);
1029 exif_mem_unref (mem);
1033 exif_data_dump (ExifData *data)
1040 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1041 if (data->ifd[i] && data->ifd[i]->count) {
1042 printf ("Dumping IFD '%s'...\n",
1043 exif_ifd_get_name (i));
1044 exif_content_dump (data->ifd[i], 0);
1049 printf ("%i byte(s) thumbnail data available.", data->size);
1050 if (data->size >= 4) {
1051 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1052 data->data[0], data->data[1],
1053 data->data[data->size - 2],
1054 data->data[data->size - 1]);
1060 exif_data_get_byte_order (ExifData *data)
1065 return (data->priv->order);
1069 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1077 for (i = 0; i < EXIF_IFD_COUNT; i++)
1078 func (data->ifd[i], user_data);
1081 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1082 struct _ByteOrderChangeData {
1083 ExifByteOrder old, new;
1087 entry_set_byte_order (ExifEntry *e, void *data)
1089 ByteOrderChangeData *d = data;
1094 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1098 content_set_byte_order (ExifContent *content, void *data)
1100 exif_content_foreach_entry (content, entry_set_byte_order, data);
1104 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1106 ByteOrderChangeData d;
1108 if (!data || (order == data->priv->order))
1111 d.old = data->priv->order;
1113 exif_data_foreach_content (data, content_set_byte_order, &d);
1114 data->priv->order = order;
1116 exif_mnote_data_set_byte_order (data->priv->md, order);
1120 exif_data_log (ExifData *data, ExifLog *log)
1124 if (!data || !data->priv)
1126 exif_log_unref (data->priv->log);
1127 data->priv->log = log;
1130 for (i = 0; i < EXIF_IFD_COUNT; i++)
1131 exif_content_log (data->ifd[i], log);
1134 /* Used internally within libexif */
1135 ExifLog *exif_data_get_log (ExifData *);
1137 exif_data_get_log (ExifData *data)
1139 if (!data || !data->priv)
1141 return data->priv->log;
1144 static const struct {
1145 ExifDataOption option;
1147 const char *description;
1148 } exif_data_option[] = {
1149 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1150 N_("Ignore unknown tags when loading EXIF data.")},
1151 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1152 N_("Add, correct and remove entries to get EXIF data that follows "
1153 "the specification.")},
1154 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1155 N_("When loading and resaving Exif data, save the maker note unmodified."
1156 " Be aware that the maker note can get corrupted.")},
1161 exif_data_option_get_name (ExifDataOption o)
1165 for (i = 0; exif_data_option[i].name; i++)
1166 if (exif_data_option[i].option == o)
1168 return _(exif_data_option[i].name);
1172 exif_data_option_get_description (ExifDataOption o)
1176 for (i = 0; exif_data_option[i].description; i++)
1177 if (exif_data_option[i].option == o)
1179 return _(exif_data_option[i].description);
1183 exif_data_set_option (ExifData *d, ExifDataOption o)
1188 d->priv->options |= o;
1192 exif_data_unset_option (ExifData *d, ExifDataOption o)
1197 d->priv->options &= ~o;
1201 fix_func (ExifContent *c, void *UNUSED(data))
1203 switch (exif_content_get_ifd (c)) {
1205 if (c->parent->data)
1206 exif_content_fix (c);
1208 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1209 "No thumbnail but entries on thumbnail. These entries have been "
1212 exif_content_remove_entry (c, c->entries[c->count - 1]);
1216 exif_content_fix (c);
1221 exif_data_fix (ExifData *d)
1223 exif_data_foreach_content (d, fix_func, NULL);
1227 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1232 d->priv->data_type = dt;
1236 exif_data_get_data_type (ExifData *d)
1238 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;