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;
238 if (!data || !data->priv)
242 * Each entry is 12 bytes long. The memory for the entry has
243 * already been allocated.
245 exif_set_short (*d + 6 + offset + 0,
246 data->priv->order, (ExifShort) e->tag);
247 exif_set_short (*d + 6 + offset + 2,
248 data->priv->order, (ExifShort) e->format);
250 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
251 /* If this is the maker note tag, update it. */
252 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
253 exif_mem_free (data->priv->mem, e->data);
256 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
257 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
258 e->components = e->size;
262 exif_set_long (*d + 6 + offset + 4,
263 data->priv->order, e->components);
266 * Size? If bigger than 4 bytes, the actual data is not in
267 * the entry but somewhere else.
269 s = exif_format_get_size (e->format) * e->components;
275 * According to the TIFF specification,
276 * the offset must be an even number. If we need to introduce
277 * a padding byte, we set it to 0.
281 t = exif_mem_realloc (data->priv->mem, *d, *ds);
283 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
287 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
289 *(*d + *ds - 1) = '\0';
294 /* Write the data. Fill unneeded bytes with 0. */
295 memcpy (*d + 6 + doff, e->data, s);
297 memset (*d + 6 + doff + s, 0, (4 - s));
301 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
302 unsigned int ds, ExifLong offset, ExifLong size)
304 if ((ds < offset + size) || (offset > ds)) {
305 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
306 "Bogus thumbnail offset (%u) or size (%u).",
311 exif_mem_free (data->priv->mem, data->data);
313 data->data = exif_data_alloc (data, data->size);
316 memcpy (data->data, d + offset, data->size);
320 #define CHECK_REC(i) \
322 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
323 "ExifData", "Recursive entry in IFD " \
324 "'%s' detected. Skipping...", \
325 exif_ifd_get_name (i)); \
328 if (data->ifd[(i)]->count) { \
329 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
330 "ExifData", "Attempt to load IFD " \
331 "'%s' multiple times detected. " \
333 exif_ifd_get_name (i)); \
338 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
339 const unsigned char *d,
340 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
342 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
348 if (!data || !data->priv)
351 /* check for valid ExifIfd enum range */
352 if (( ((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
355 if (recursion_depth > 150) {
356 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
357 "Deep recursion detected!");
361 /* Read the number of entries */
362 if (offset >= ds - 1)
364 n = exif_get_short (d + offset, data->priv->order);
365 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
366 "Loading %i entries...", n);
369 /* Check if we have enough data. */
370 if (offset + 12 * n > ds)
371 n = (ds - offset) / 12;
373 for (i = 0; i < n; i++) {
375 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
377 case EXIF_TAG_EXIF_IFD_POINTER:
378 case EXIF_TAG_GPS_INFO_IFD_POINTER:
379 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
380 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
381 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
382 o = exif_get_long (d + offset + 12 * i + 8,
385 case EXIF_TAG_EXIF_IFD_POINTER:
386 CHECK_REC (EXIF_IFD_EXIF);
387 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
389 case EXIF_TAG_GPS_INFO_IFD_POINTER:
390 CHECK_REC (EXIF_IFD_GPS);
391 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
393 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
394 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
395 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
397 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
398 thumbnail_offset = o;
399 if (thumbnail_offset && thumbnail_length)
400 exif_data_load_data_thumbnail (data, d,
401 ds, thumbnail_offset,
404 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
405 thumbnail_length = o;
406 if (thumbnail_offset && thumbnail_length)
407 exif_data_load_data_thumbnail (data, d,
408 ds, thumbnail_offset,
418 * If we don't know the tag, don't fail. It could be that new
419 * versions of the standard have defined additional tags. Note that
420 * 0 is a valid tag in the GPS IFD.
422 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
425 * Special case: Tag and format 0. That's against specification.
426 * At least up to 2.2. But Photoshop writes it anyways.
428 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
429 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
430 "Skipping empty entry at position %i in '%s'.", i,
431 exif_ifd_get_name (ifd));
434 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
435 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
436 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
437 exif_ifd_get_name (ifd));
438 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
441 entry = exif_entry_new_mem (data->priv->mem);
442 if (exif_data_load_data_entry (data, entry, d, ds,
444 exif_content_add_entry (data->ifd[ifd], entry);
445 exif_entry_unref (entry);
452 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
454 ExifShort tag1 = exif_get_short (p1, o);
455 ExifShort tag2 = exif_get_short (p2, o);
457 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
461 cmp_func_intel (const void *elem1, const void *elem2)
463 return cmp_func ((const unsigned char *) elem1,
464 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
468 cmp_func_motorola (const void *elem1, const void *elem2)
470 return cmp_func ((const unsigned char *) elem1,
471 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
475 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
476 unsigned char **d, unsigned int *ds,
479 unsigned int j, n_ptr = 0, n_thumb = 0;
483 if (!data || !data->priv || !ifd || !d || !ds)
486 for (i = 0; i < EXIF_IFD_COUNT; i++)
487 if (ifd == data->ifd[i])
489 if (i == EXIF_IFD_COUNT)
493 * Check if we need some extra entries for pointers or the thumbnail.
499 * The pointer to IFD_EXIF is in IFD_0. The pointer to
500 * IFD_INTEROPERABILITY is in IFD_EXIF.
502 if (data->ifd[EXIF_IFD_EXIF]->count ||
503 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
506 /* The pointer to IFD_GPS is in IFD_0. */
507 if (data->ifd[EXIF_IFD_GPS]->count)
516 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
523 * Allocate enough memory for all entries
524 * and the number of entries.
526 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
527 t = exif_mem_realloc (data->priv->mem, *d, *ds);
529 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
534 /* Save the number of entries */
535 exif_set_short (*d + 6 + offset, data->priv->order,
536 (ExifShort) (ifd->count + n_ptr + n_thumb));
539 /* Save each entry */
540 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
541 "Saving %i entries (IFD '%s', offset: %i)...",
542 ifd->count, exif_ifd_get_name (i), offset);
543 for (j = 0; j < ifd->count; j++) {
544 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
546 return; /* out of memory */
549 offset += 12 * ifd->count;
551 /* Now save special entries. */
556 * The pointer to IFD_EXIF is in IFD_0.
557 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
558 * therefore, if IFD_INTEROPERABILITY is not empty, we need
559 * IFD_EXIF even if latter is empty.
561 if (data->ifd[EXIF_IFD_EXIF]->count ||
562 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
563 exif_set_short (*d + 6 + offset + 0, data->priv->order,
564 EXIF_TAG_EXIF_IFD_POINTER);
565 exif_set_short (*d + 6 + offset + 2, data->priv->order,
567 exif_set_long (*d + 6 + offset + 4, data->priv->order,
569 exif_set_long (*d + 6 + offset + 8, data->priv->order,
571 exif_data_save_data_content (data,
572 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
576 /* The pointer to IFD_GPS is in IFD_0, too. */
577 if (data->ifd[EXIF_IFD_GPS]->count) {
578 exif_set_short (*d + 6 + offset + 0, data->priv->order,
579 EXIF_TAG_GPS_INFO_IFD_POINTER);
580 exif_set_short (*d + 6 + offset + 2, data->priv->order,
582 exif_set_long (*d + 6 + offset + 4, data->priv->order,
584 exif_set_long (*d + 6 + offset + 8, data->priv->order,
586 exif_data_save_data_content (data,
587 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
595 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
598 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
599 exif_set_short (*d + 6 + offset + 0, data->priv->order,
600 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
601 exif_set_short (*d + 6 + offset + 2, data->priv->order,
603 exif_set_long (*d + 6 + offset + 4, data->priv->order,
605 exif_set_long (*d + 6 + offset + 8, data->priv->order,
607 exif_data_save_data_content (data,
608 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
617 * Information about the thumbnail (if any) is saved in
622 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
623 exif_set_short (*d + 6 + offset + 0, data->priv->order,
624 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
625 exif_set_short (*d + 6 + offset + 2, data->priv->order,
627 exif_set_long (*d + 6 + offset + 4, data->priv->order,
629 exif_set_long (*d + 6 + offset + 8, data->priv->order,
632 t = exif_mem_realloc (data->priv->mem, *d, *ds);
634 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
639 memcpy (*d + *ds - data->size, data->data, data->size);
642 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
643 exif_set_short (*d + 6 + offset + 0, data->priv->order,
644 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
645 exif_set_short (*d + 6 + offset + 2, data->priv->order,
647 exif_set_long (*d + 6 + offset + 4, data->priv->order,
649 exif_set_long (*d + 6 + offset + 8, data->priv->order,
659 /* Sort the directory according to TIFF specification */
660 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
661 (ifd->count + n_ptr + n_thumb), 12,
662 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
664 /* Correctly terminate the directory */
665 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
669 * We are saving IFD 0. Tell where IFD 1 starts and save
672 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
673 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
676 exif_set_long (*d + 6 + offset, data->priv->order, 0);
680 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
681 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
682 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
683 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
684 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
685 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5,
686 EXIF_DATA_TYPE_MAKER_NOTE_FUJI = 6
687 } ExifDataTypeMakerNote;
689 static ExifDataTypeMakerNote
690 exif_data_get_type_maker_note (ExifData *d)
696 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
698 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
700 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
702 /* Olympus & Nikon & Sanyo */
703 if ((e->size >= 8) && ( !memcmp (e->data, "OLYMP", 6) ||
704 !memcmp (e->data, "OLYMPUS", 8) ||
705 !memcmp (e->data, "SANYO", 6) ||
706 !memcmp (e->data, "Nikon", 6)))
707 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
709 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
711 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
714 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
715 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
717 /* Pentax & some variant of Nikon */
718 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
720 exif_entry_get_value (em, value, sizeof(value)),
722 return EXIF_DATA_TYPE_MAKER_NOTE_NIKON;
724 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
726 if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
727 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
729 if ((e->size >= 8) && !memcmp (e->data, "QVC", 4)) {
730 return EXIF_DATA_TYPE_MAKER_NOTE_CASIO;
732 if ((e->size >= 12) && !memcmp (e->data, "FUJIFILM", 8)) {
733 return EXIF_DATA_TYPE_MAKER_NOTE_FUJI;
736 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
739 #define LOG_TOO_SMALL \
740 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
741 _("Size of data too small to allow for EXIF data."));
744 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
745 unsigned int ds_orig)
750 const unsigned char *d = d_orig;
751 unsigned int ds = ds_orig, len;
753 if (!data || !data->priv || !d || !ds)
756 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
757 "Parsing %i byte(s) EXIF data...\n", ds);
760 * It can be that the data starts with the EXIF header. If it does
761 * not, search the EXIF marker.
767 if (!memcmp (d, ExifHeader, 6)) {
768 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
769 "Found EXIF header.");
772 while ((d[0] == 0xff) && ds) {
777 /* JPEG_MARKER_SOI */
778 if (d[0] == JPEG_MARKER_SOI) {
784 /* JPEG_MARKER_APP0 */
785 if (d[0] == JPEG_MARKER_APP0) {
788 l = (d[0] << 8) | d[1];
796 /* JPEG_MARKER_APP1 */
797 if (d[0] == JPEG_MARKER_APP1)
800 /* Unknown marker or data. Give up. */
801 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
802 "ExifData", _("EXIF marker not found."));
811 len = (d[0] << 8) | d[1];
812 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
813 "We have to deal with %i byte(s) of EXIF data.",
820 * Verify the exif header
821 * (offset 2, length 6).
827 if (memcmp (d, ExifHeader, 6)) {
828 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
829 "ExifData", _("EXIF header not found."));
833 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
834 "Found EXIF header.");
836 /* Byte order (offset 6, length 2) */
839 if (!memcmp (d + 6, "II", 2))
840 data->priv->order = EXIF_BYTE_ORDER_INTEL;
841 else if (!memcmp (d + 6, "MM", 2))
842 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
844 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
845 "ExifData", _("Unknown encoding."));
850 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
854 offset = exif_get_long (d + 10, data->priv->order);
855 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
856 "IFD 0 at %i.", (int) offset);
858 /* Parse the actual exif data (usually offset 14 from start) */
859 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
862 if (offset + 6 + 2 > ds) {
865 n = exif_get_short (d + 6 + offset, data->priv->order);
866 if (offset + 6 + 2 + 12 * n + 4 > ds) {
869 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
871 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
872 "IFD 1 at %i.", (int) offset);
875 if (offset > ds - 6) {
876 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
877 "ExifData", "Bogus offset of IFD1.");
879 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
884 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
885 * cameras use pointers in the maker note tag that point to the
886 * space between IFDs. Here is the only place where we have access
889 switch (exif_data_get_type_maker_note (data)) {
890 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
891 case EXIF_DATA_TYPE_MAKER_NOTE_NIKON:
892 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
894 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
895 case EXIF_DATA_TYPE_MAKER_NOTE_CASIO:
896 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
898 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
899 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
901 case EXIF_DATA_TYPE_MAKER_NOTE_FUJI:
902 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
909 * If we are able to interpret the maker note, do so.
911 if (data->priv->md) {
912 exif_mnote_data_log (data->priv->md, data->priv->log);
913 exif_mnote_data_set_byte_order (data->priv->md,
915 exif_mnote_data_set_offset (data->priv->md,
916 data->priv->offset_mnote);
917 exif_mnote_data_load (data->priv->md, d, ds);
920 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
921 exif_data_fix (data);
925 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
928 *ds = 0; /* This means something went wrong */
930 if (!data || !d || !ds)
935 *d = exif_data_alloc (data, *ds);
940 memcpy (*d, ExifHeader, 6);
942 /* Order (offset 6) */
943 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
944 memcpy (*d + 6, "II", 2);
946 memcpy (*d + 6, "MM", 2);
949 /* Fixed value (2 bytes, offset 8) */
950 exif_set_short (*d + 8, data->priv->order, 0x002a);
953 * IFD 0 offset (4 bytes, offset 10).
954 * We will start 8 bytes after the
955 * EXIF header (2 bytes for order, another 2 for the test, and
956 * 4 bytes for the IFD 0 offset make 8 bytes together).
958 exif_set_long (*d + 10, data->priv->order, 8);
960 /* Now save IFD 0. IFD 1 will be saved automatically. */
961 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
963 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
965 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
966 "Saved %i byte(s) EXIF data.", *ds);
970 exif_data_new_from_file (const char *path)
975 loader = exif_loader_new ();
976 exif_loader_write_file (loader, path);
977 edata = exif_loader_get_data (loader);
978 exif_loader_unref (loader);
984 exif_data_ref (ExifData *data)
989 data->priv->ref_count++;
993 exif_data_unref (ExifData *data)
998 data->priv->ref_count--;
999 if (!data->priv->ref_count)
1000 exif_data_free (data);
1004 exif_data_free (ExifData *data)
1007 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
1012 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1014 exif_content_unref (data->ifd[i]);
1015 data->ifd[i] = NULL;
1020 exif_mem_free (mem, data->data);
1025 if (data->priv->log) {
1026 exif_log_unref (data->priv->log);
1027 data->priv->log = NULL;
1029 if (data->priv->md) {
1030 exif_mnote_data_unref (data->priv->md);
1031 data->priv->md = NULL;
1033 exif_mem_free (mem, data->priv);
1034 exif_mem_free (mem, data);
1037 exif_mem_unref (mem);
1041 exif_data_dump (ExifData *data)
1048 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1049 if (data->ifd[i] && data->ifd[i]->count) {
1050 printf ("Dumping IFD '%s'...\n",
1051 exif_ifd_get_name (i));
1052 exif_content_dump (data->ifd[i], 0);
1057 printf ("%i byte(s) thumbnail data available.", data->size);
1058 if (data->size >= 4) {
1059 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1060 data->data[0], data->data[1],
1061 data->data[data->size - 2],
1062 data->data[data->size - 1]);
1068 exif_data_get_byte_order (ExifData *data)
1073 return (data->priv->order);
1077 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1085 for (i = 0; i < EXIF_IFD_COUNT; i++)
1086 func (data->ifd[i], user_data);
1089 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1090 struct _ByteOrderChangeData {
1091 ExifByteOrder old, new;
1095 entry_set_byte_order (ExifEntry *e, void *data)
1097 ByteOrderChangeData *d = data;
1102 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1106 content_set_byte_order (ExifContent *content, void *data)
1108 exif_content_foreach_entry (content, entry_set_byte_order, data);
1112 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1114 ByteOrderChangeData d;
1116 if (!data || (order == data->priv->order))
1119 d.old = data->priv->order;
1121 exif_data_foreach_content (data, content_set_byte_order, &d);
1122 data->priv->order = order;
1124 exif_mnote_data_set_byte_order (data->priv->md, order);
1128 exif_data_log (ExifData *data, ExifLog *log)
1132 if (!data || !data->priv)
1134 exif_log_unref (data->priv->log);
1135 data->priv->log = log;
1138 for (i = 0; i < EXIF_IFD_COUNT; i++)
1139 exif_content_log (data->ifd[i], log);
1142 /* Used internally within libexif */
1143 ExifLog *exif_data_get_log (ExifData *);
1145 exif_data_get_log (ExifData *data)
1147 if (!data || !data->priv)
1149 return data->priv->log;
1152 static const struct {
1153 ExifDataOption option;
1155 const char *description;
1156 } exif_data_option[] = {
1157 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1158 N_("Ignore unknown tags when loading EXIF data.")},
1159 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1160 N_("Add, correct and remove entries to get EXIF data that follows "
1161 "the specification.")},
1162 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1163 N_("When loading and resaving Exif data, save the maker note unmodified."
1164 " Be aware that the maker note can get corrupted.")},
1169 exif_data_option_get_name (ExifDataOption o)
1173 for (i = 0; exif_data_option[i].name; i++)
1174 if (exif_data_option[i].option == o)
1176 return _(exif_data_option[i].name);
1180 exif_data_option_get_description (ExifDataOption o)
1184 for (i = 0; exif_data_option[i].description; i++)
1185 if (exif_data_option[i].option == o)
1187 return _(exif_data_option[i].description);
1191 exif_data_set_option (ExifData *d, ExifDataOption o)
1196 d->priv->options |= o;
1200 exif_data_unset_option (ExifData *d, ExifDataOption o)
1205 d->priv->options &= ~o;
1209 fix_func (ExifContent *c, void *UNUSED(data))
1211 switch (exif_content_get_ifd (c)) {
1213 if (c->parent->data)
1214 exif_content_fix (c);
1216 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1217 "No thumbnail but entries on thumbnail. These entries have been "
1220 exif_content_remove_entry (c, c->entries[c->count - 1]);
1224 exif_content_fix (c);
1229 exif_data_fix (ExifData *d)
1231 exif_data_foreach_content (d, fix_func, NULL);
1235 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1240 d->priv->data_type = dt;
1244 exif_data_get_data_type (ExifData *d)
1246 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;