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 return; /* out of memory */
545 offset += 12 * ifd->count;
547 /* Now save special entries. */
552 * The pointer to IFD_EXIF is in IFD_0.
553 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
554 * therefore, if IFD_INTEROPERABILITY is not empty, we need
555 * IFD_EXIF even if latter is empty.
557 if (data->ifd[EXIF_IFD_EXIF]->count ||
558 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
559 exif_set_short (*d + 6 + offset + 0, data->priv->order,
560 EXIF_TAG_EXIF_IFD_POINTER);
561 exif_set_short (*d + 6 + offset + 2, data->priv->order,
563 exif_set_long (*d + 6 + offset + 4, data->priv->order,
565 exif_set_long (*d + 6 + offset + 8, data->priv->order,
567 exif_data_save_data_content (data,
568 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
572 /* The pointer to IFD_GPS is in IFD_0, too. */
573 if (data->ifd[EXIF_IFD_GPS]->count) {
574 exif_set_short (*d + 6 + offset + 0, data->priv->order,
575 EXIF_TAG_GPS_INFO_IFD_POINTER);
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,
582 exif_data_save_data_content (data,
583 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
591 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
594 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
595 exif_set_short (*d + 6 + offset + 0, data->priv->order,
596 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
597 exif_set_short (*d + 6 + offset + 2, data->priv->order,
599 exif_set_long (*d + 6 + offset + 4, data->priv->order,
601 exif_set_long (*d + 6 + offset + 8, data->priv->order,
603 exif_data_save_data_content (data,
604 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
613 * Information about the thumbnail (if any) is saved in
618 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
619 exif_set_short (*d + 6 + offset + 0, data->priv->order,
620 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
621 exif_set_short (*d + 6 + offset + 2, data->priv->order,
623 exif_set_long (*d + 6 + offset + 4, data->priv->order,
625 exif_set_long (*d + 6 + offset + 8, data->priv->order,
628 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
630 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
634 memcpy (*d + *ds - data->size, data->data, data->size);
637 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
638 exif_set_short (*d + 6 + offset + 0, data->priv->order,
639 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
640 exif_set_short (*d + 6 + offset + 2, data->priv->order,
642 exif_set_long (*d + 6 + offset + 4, data->priv->order,
644 exif_set_long (*d + 6 + offset + 8, data->priv->order,
654 /* Sort the directory according to TIFF specification */
655 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
656 (ifd->count + n_ptr + n_thumb), 12,
657 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
659 /* Correctly terminate the directory */
660 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
664 * We are saving IFD 0. Tell where IFD 1 starts and save
667 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
668 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
671 exif_set_long (*d + 6 + offset, data->priv->order, 0);
675 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
676 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
677 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
678 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
679 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
680 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5,
681 EXIF_DATA_TYPE_MAKER_NOTE_FUJI = 6
682 } ExifDataTypeMakerNote;
684 static ExifDataTypeMakerNote
685 exif_data_get_type_maker_note (ExifData *d)
691 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
693 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
695 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
697 /* Olympus & Nikon & Sanyo */
698 if ((e->size >= 8) && ( !memcmp (e->data, "OLYMP", 6) ||
699 !memcmp (e->data, "OLYMPUS", 8) ||
700 !memcmp (e->data, "SANYO", 6) ||
701 !memcmp (e->data, "Nikon", 6)))
702 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
704 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
706 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
709 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
710 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
712 /* Pentax & some variant of Nikon */
713 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
715 exif_entry_get_value (em, value, sizeof(value)),
717 return EXIF_DATA_TYPE_MAKER_NOTE_NIKON;
719 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
721 if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
722 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
724 if ((e->size >= 8) && !memcmp (e->data, "QVC", 4)) {
725 return EXIF_DATA_TYPE_MAKER_NOTE_CASIO;
727 if ((e->size >= 12) && !memcmp (e->data, "FUJIFILM", 8)) {
728 return EXIF_DATA_TYPE_MAKER_NOTE_FUJI;
731 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
734 #define LOG_TOO_SMALL \
735 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
736 _("Size of data too small to allow for EXIF data."));
739 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
740 unsigned int ds_orig)
745 const unsigned char *d = d_orig;
746 unsigned int ds = ds_orig, len;
748 if (!data || !data->priv || !d || !ds)
751 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
752 "Parsing %i byte(s) EXIF data...\n", ds);
755 * It can be that the data starts with the EXIF header. If it does
756 * not, search the EXIF marker.
762 if (!memcmp (d, ExifHeader, 6)) {
763 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
764 "Found EXIF header.");
767 while ((d[0] == 0xff) && ds) {
772 /* JPEG_MARKER_SOI */
773 if (d[0] == JPEG_MARKER_SOI) {
779 /* JPEG_MARKER_APP0 */
780 if (d[0] == JPEG_MARKER_APP0) {
783 l = (d[0] << 8) | d[1];
791 /* JPEG_MARKER_APP1 */
792 if (d[0] == JPEG_MARKER_APP1)
795 /* Unknown marker or data. Give up. */
796 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
797 "ExifData", _("EXIF marker not found."));
806 len = (d[0] << 8) | d[1];
807 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
808 "We have to deal with %i byte(s) of EXIF data.",
815 * Verify the exif header
816 * (offset 2, length 6).
822 if (memcmp (d, ExifHeader, 6)) {
823 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
824 "ExifData", _("EXIF header not found."));
828 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
829 "Found EXIF header.");
831 /* Byte order (offset 6, length 2) */
834 if (!memcmp (d + 6, "II", 2))
835 data->priv->order = EXIF_BYTE_ORDER_INTEL;
836 else if (!memcmp (d + 6, "MM", 2))
837 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
839 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
840 "ExifData", _("Unknown encoding."));
845 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
849 offset = exif_get_long (d + 10, data->priv->order);
850 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
851 "IFD 0 at %i.", (int) offset);
853 /* Parse the actual exif data (usually offset 14 from start) */
854 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
857 if (offset + 6 + 2 > ds) {
860 n = exif_get_short (d + 6 + offset, data->priv->order);
861 if (offset + 6 + 2 + 12 * n + 4 > ds) {
864 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
866 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
867 "IFD 1 at %i.", (int) offset);
870 if (offset > ds - 6) {
871 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
872 "ExifData", "Bogus offset of IFD1.");
874 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
879 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
880 * cameras use pointers in the maker note tag that point to the
881 * space between IFDs. Here is the only place where we have access
884 switch (exif_data_get_type_maker_note (data)) {
885 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
886 case EXIF_DATA_TYPE_MAKER_NOTE_NIKON:
887 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
889 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
890 case EXIF_DATA_TYPE_MAKER_NOTE_CASIO:
891 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
893 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
894 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
896 case EXIF_DATA_TYPE_MAKER_NOTE_FUJI:
897 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
904 * If we are able to interpret the maker note, do so.
906 if (data->priv->md) {
907 exif_mnote_data_log (data->priv->md, data->priv->log);
908 exif_mnote_data_set_byte_order (data->priv->md,
910 exif_mnote_data_set_offset (data->priv->md,
911 data->priv->offset_mnote);
912 exif_mnote_data_load (data->priv->md, d, ds);
915 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
916 exif_data_fix (data);
920 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
923 *ds = 0; /* This means something went wrong */
925 if (!data || !d || !ds)
930 *d = exif_data_alloc (data, *ds);
935 memcpy (*d, ExifHeader, 6);
937 /* Order (offset 6) */
938 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
939 memcpy (*d + 6, "II", 2);
941 memcpy (*d + 6, "MM", 2);
944 /* Fixed value (2 bytes, offset 8) */
945 exif_set_short (*d + 8, data->priv->order, 0x002a);
948 * IFD 0 offset (4 bytes, offset 10).
949 * We will start 8 bytes after the
950 * EXIF header (2 bytes for order, another 2 for the test, and
951 * 4 bytes for the IFD 0 offset make 8 bytes together).
953 exif_set_long (*d + 10, data->priv->order, 8);
955 /* Now save IFD 0. IFD 1 will be saved automatically. */
956 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
958 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
960 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
961 "Saved %i byte(s) EXIF data.", *ds);
965 exif_data_new_from_file (const char *path)
970 loader = exif_loader_new ();
971 exif_loader_write_file (loader, path);
972 edata = exif_loader_get_data (loader);
973 exif_loader_unref (loader);
979 exif_data_ref (ExifData *data)
984 data->priv->ref_count++;
988 exif_data_unref (ExifData *data)
993 data->priv->ref_count--;
994 if (!data->priv->ref_count)
995 exif_data_free (data);
999 exif_data_free (ExifData *data)
1002 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
1007 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1009 exif_content_unref (data->ifd[i]);
1010 data->ifd[i] = NULL;
1015 exif_mem_free (mem, data->data);
1020 if (data->priv->log) {
1021 exif_log_unref (data->priv->log);
1022 data->priv->log = NULL;
1024 if (data->priv->md) {
1025 exif_mnote_data_unref (data->priv->md);
1026 data->priv->md = NULL;
1028 exif_mem_free (mem, data->priv);
1029 exif_mem_free (mem, data);
1032 exif_mem_unref (mem);
1036 exif_data_dump (ExifData *data)
1043 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1044 if (data->ifd[i] && data->ifd[i]->count) {
1045 printf ("Dumping IFD '%s'...\n",
1046 exif_ifd_get_name (i));
1047 exif_content_dump (data->ifd[i], 0);
1052 printf ("%i byte(s) thumbnail data available.", data->size);
1053 if (data->size >= 4) {
1054 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1055 data->data[0], data->data[1],
1056 data->data[data->size - 2],
1057 data->data[data->size - 1]);
1063 exif_data_get_byte_order (ExifData *data)
1068 return (data->priv->order);
1072 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1080 for (i = 0; i < EXIF_IFD_COUNT; i++)
1081 func (data->ifd[i], user_data);
1084 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1085 struct _ByteOrderChangeData {
1086 ExifByteOrder old, new;
1090 entry_set_byte_order (ExifEntry *e, void *data)
1092 ByteOrderChangeData *d = data;
1097 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1101 content_set_byte_order (ExifContent *content, void *data)
1103 exif_content_foreach_entry (content, entry_set_byte_order, data);
1107 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1109 ByteOrderChangeData d;
1111 if (!data || (order == data->priv->order))
1114 d.old = data->priv->order;
1116 exif_data_foreach_content (data, content_set_byte_order, &d);
1117 data->priv->order = order;
1119 exif_mnote_data_set_byte_order (data->priv->md, order);
1123 exif_data_log (ExifData *data, ExifLog *log)
1127 if (!data || !data->priv)
1129 exif_log_unref (data->priv->log);
1130 data->priv->log = log;
1133 for (i = 0; i < EXIF_IFD_COUNT; i++)
1134 exif_content_log (data->ifd[i], log);
1137 /* Used internally within libexif */
1138 ExifLog *exif_data_get_log (ExifData *);
1140 exif_data_get_log (ExifData *data)
1142 if (!data || !data->priv)
1144 return data->priv->log;
1147 static const struct {
1148 ExifDataOption option;
1150 const char *description;
1151 } exif_data_option[] = {
1152 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1153 N_("Ignore unknown tags when loading EXIF data.")},
1154 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1155 N_("Add, correct and remove entries to get EXIF data that follows "
1156 "the specification.")},
1157 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1158 N_("When loading and resaving Exif data, save the maker note unmodified."
1159 " Be aware that the maker note can get corrupted.")},
1164 exif_data_option_get_name (ExifDataOption o)
1168 for (i = 0; exif_data_option[i].name; i++)
1169 if (exif_data_option[i].option == o)
1171 return _(exif_data_option[i].name);
1175 exif_data_option_get_description (ExifDataOption o)
1179 for (i = 0; exif_data_option[i].description; i++)
1180 if (exif_data_option[i].option == o)
1182 return _(exif_data_option[i].description);
1186 exif_data_set_option (ExifData *d, ExifDataOption o)
1191 d->priv->options |= o;
1195 exif_data_unset_option (ExifData *d, ExifDataOption o)
1200 d->priv->options &= ~o;
1204 fix_func (ExifContent *c, void *UNUSED(data))
1206 switch (exif_content_get_ifd (c)) {
1208 if (c->parent->data)
1209 exif_content_fix (c);
1211 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1212 "No thumbnail but entries on thumbnail. These entries have been "
1215 exif_content_remove_entry (c, c->entries[c->count - 1]);
1219 exif_content_fix (c);
1224 exif_data_fix (ExifData *d)
1226 exif_data_foreach_content (d, fix_func, NULL);
1230 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1235 d->priv->data_type = dt;
1239 exif_data_get_data_type (ExifData *d)
1241 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;