3 * Copyright (c) 2001 Lutz Mueller <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;
239 if (!data || !data->priv)
243 * Each entry is 12 bytes long. The memory for the entry has
244 * already been allocated.
246 exif_set_short (*d + 6 + offset + 0,
247 data->priv->order, (ExifShort) e->tag);
248 exif_set_short (*d + 6 + offset + 2,
249 data->priv->order, (ExifShort) e->format);
251 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
252 /* If this is the maker note tag, update it. */
253 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
254 exif_mem_free (data->priv->mem, e->data);
257 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
258 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
259 e->components = e->size;
263 exif_set_long (*d + 6 + offset + 4,
264 data->priv->order, e->components);
267 * Size? If bigger than 4 bytes, the actual data is not in
268 * the entry but somewhere else.
270 s = exif_format_get_size (e->format) * e->components;
276 * According to the TIFF specification,
277 * the offset must be an even number. If we need to introduce
278 * a padding byte, we set it to 0.
282 t = exif_mem_realloc (data->priv->mem, *d, ts);
284 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
289 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
291 *(*d + *ds - 1) = '\0';
296 /* Write the data. Fill unneeded bytes with 0. Do not crash with
299 memcpy (*d + 6 + doff, e->data, s);
301 memset (*d + 6 + doff, 0, s);
304 memset (*d + 6 + doff + s, 0, (4 - s));
308 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
309 unsigned int ds, ExifLong offset, ExifLong size)
311 if ((ds < offset + size) || (offset > ds)) {
312 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
313 "Bogus thumbnail offset (%u) or size (%u).",
318 exif_mem_free (data->priv->mem, data->data);
320 data->data = exif_data_alloc (data, data->size);
323 memcpy (data->data, d + offset, data->size);
327 #define CHECK_REC(i) \
329 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
330 "ExifData", "Recursive entry in IFD " \
331 "'%s' detected. Skipping...", \
332 exif_ifd_get_name (i)); \
335 if (data->ifd[(i)]->count) { \
336 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
337 "ExifData", "Attempt to load IFD " \
338 "'%s' multiple times detected. " \
340 exif_ifd_get_name (i)); \
344 /*! Load data for an IFD.
346 * \param[in/out] data #ExifData
347 * \param[in] ifd IFD to load
348 * \param[in] d pointer to buffer containing raw IFD data
349 * \param[in] ds size of raw data in buffer at \c d
350 * \param[in] offset offset into buffer at \c d at which IFD starts
351 * \param[in] recursion_depth number of times this function has been
352 * recursively called without returning
355 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
356 const unsigned char *d,
357 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
359 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
365 if (!data || !data->priv)
368 /* check for valid ExifIfd enum range */
369 if (( ((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
372 if (recursion_depth > 150) {
373 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
374 "Deep recursion detected!");
378 /* Read the number of entries */
379 if (offset >= ds - 1)
381 n = exif_get_short (d + offset, data->priv->order);
382 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
383 "Loading %i entries...", n);
386 /* Check if we have enough data. */
387 if (offset + 12 * n > ds)
388 n = (ds - offset) / 12;
390 for (i = 0; i < n; i++) {
392 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
394 case EXIF_TAG_EXIF_IFD_POINTER:
395 case EXIF_TAG_GPS_INFO_IFD_POINTER:
396 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
397 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
398 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
399 o = exif_get_long (d + offset + 12 * i + 8,
402 case EXIF_TAG_EXIF_IFD_POINTER:
403 CHECK_REC (EXIF_IFD_EXIF);
404 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
406 case EXIF_TAG_GPS_INFO_IFD_POINTER:
407 CHECK_REC (EXIF_IFD_GPS);
408 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
410 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
411 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
412 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
414 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
415 thumbnail_offset = o;
416 if (thumbnail_offset && thumbnail_length)
417 exif_data_load_data_thumbnail (data, d,
418 ds, thumbnail_offset,
421 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
422 thumbnail_length = o;
423 if (thumbnail_offset && thumbnail_length)
424 exif_data_load_data_thumbnail (data, d,
425 ds, thumbnail_offset,
435 * If we don't know the tag, don't fail. It could be that new
436 * versions of the standard have defined additional tags. Note that
437 * 0 is a valid tag in the GPS IFD.
439 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
442 * Special case: Tag and format 0. That's against specification.
443 * At least up to 2.2. But Photoshop writes it anyways.
445 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
446 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
447 "Skipping empty entry at position %i in '%s'.", i,
448 exif_ifd_get_name (ifd));
451 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
452 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
453 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
454 exif_ifd_get_name (ifd));
455 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
458 entry = exif_entry_new_mem (data->priv->mem);
459 if (exif_data_load_data_entry (data, entry, d, ds,
461 exif_content_add_entry (data->ifd[ifd], entry);
462 exif_entry_unref (entry);
469 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
471 ExifShort tag1 = exif_get_short (p1, o);
472 ExifShort tag2 = exif_get_short (p2, o);
474 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
478 cmp_func_intel (const void *elem1, const void *elem2)
480 return cmp_func ((const unsigned char *) elem1,
481 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
485 cmp_func_motorola (const void *elem1, const void *elem2)
487 return cmp_func ((const unsigned char *) elem1,
488 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
492 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
493 unsigned char **d, unsigned int *ds,
496 unsigned int j, n_ptr = 0, n_thumb = 0;
501 if (!data || !data->priv || !ifd || !d || !ds)
504 for (i = 0; i < EXIF_IFD_COUNT; i++)
505 if (ifd == data->ifd[i])
507 if (i == EXIF_IFD_COUNT)
511 * Check if we need some extra entries for pointers or the thumbnail.
517 * The pointer to IFD_EXIF is in IFD_0. The pointer to
518 * IFD_INTEROPERABILITY is in IFD_EXIF.
520 if (data->ifd[EXIF_IFD_EXIF]->count ||
521 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
524 /* The pointer to IFD_GPS is in IFD_0. */
525 if (data->ifd[EXIF_IFD_GPS]->count)
534 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
541 * Allocate enough memory for all entries
542 * and the number of entries.
544 ts = *ds + (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
545 t = exif_mem_realloc (data->priv->mem, *d, ts);
547 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
553 /* Save the number of entries */
554 exif_set_short (*d + 6 + offset, data->priv->order,
555 (ExifShort) (ifd->count + n_ptr + n_thumb));
559 * Save each entry. Make sure that no memcpys from NULL pointers are
562 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
563 "Saving %i entries (IFD '%s', offset: %i)...",
564 ifd->count, exif_ifd_get_name (i), offset);
565 for (j = 0; j < ifd->count; j++) {
566 if (ifd->entries[j]) {
567 exif_data_save_data_entry (data, ifd->entries[j], d, ds,
572 offset += 12 * ifd->count;
574 /* Now save special entries. */
579 * The pointer to IFD_EXIF is in IFD_0.
580 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
581 * therefore, if IFD_INTEROPERABILITY is not empty, we need
582 * IFD_EXIF even if latter is empty.
584 if (data->ifd[EXIF_IFD_EXIF]->count ||
585 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
586 exif_set_short (*d + 6 + offset + 0, data->priv->order,
587 EXIF_TAG_EXIF_IFD_POINTER);
588 exif_set_short (*d + 6 + offset + 2, data->priv->order,
590 exif_set_long (*d + 6 + offset + 4, data->priv->order,
592 exif_set_long (*d + 6 + offset + 8, data->priv->order,
594 exif_data_save_data_content (data,
595 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
599 /* The pointer to IFD_GPS is in IFD_0, too. */
600 if (data->ifd[EXIF_IFD_GPS]->count) {
601 exif_set_short (*d + 6 + offset + 0, data->priv->order,
602 EXIF_TAG_GPS_INFO_IFD_POINTER);
603 exif_set_short (*d + 6 + offset + 2, data->priv->order,
605 exif_set_long (*d + 6 + offset + 4, data->priv->order,
607 exif_set_long (*d + 6 + offset + 8, data->priv->order,
609 exif_data_save_data_content (data,
610 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
618 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
621 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
622 exif_set_short (*d + 6 + offset + 0, data->priv->order,
623 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
624 exif_set_short (*d + 6 + offset + 2, data->priv->order,
626 exif_set_long (*d + 6 + offset + 4, data->priv->order,
628 exif_set_long (*d + 6 + offset + 8, data->priv->order,
630 exif_data_save_data_content (data,
631 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
640 * Information about the thumbnail (if any) is saved in
645 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
646 exif_set_short (*d + 6 + offset + 0, data->priv->order,
647 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
648 exif_set_short (*d + 6 + offset + 2, data->priv->order,
650 exif_set_long (*d + 6 + offset + 4, data->priv->order,
652 exif_set_long (*d + 6 + offset + 8, data->priv->order,
654 ts = *ds + data->size;
655 t = exif_mem_realloc (data->priv->mem, *d, ts);
657 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
663 memcpy (*d + *ds - data->size, data->data, data->size);
666 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
667 exif_set_short (*d + 6 + offset + 0, data->priv->order,
668 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
669 exif_set_short (*d + 6 + offset + 2, data->priv->order,
671 exif_set_long (*d + 6 + offset + 4, data->priv->order,
673 exif_set_long (*d + 6 + offset + 8, data->priv->order,
683 /* Sort the directory according to TIFF specification */
684 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
685 (ifd->count + n_ptr + n_thumb), 12,
686 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
688 /* Correctly terminate the directory */
689 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
693 * We are saving IFD 0. Tell where IFD 1 starts and save
696 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
697 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
700 exif_set_long (*d + 6 + offset, data->priv->order, 0);
704 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
705 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
706 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
707 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
708 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
709 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5,
710 EXIF_DATA_TYPE_MAKER_NOTE_FUJI = 6
711 } ExifDataTypeMakerNote;
713 static ExifDataTypeMakerNote
714 exif_data_get_type_maker_note (ExifData *d)
720 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
722 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
724 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
726 /* Olympus & Nikon & Sanyo */
727 if ((e->size >= 8) && ( !memcmp (e->data, "OLYMP", 6) ||
728 !memcmp (e->data, "OLYMPUS", 8) ||
729 !memcmp (e->data, "SANYO", 6) ||
730 !memcmp (e->data, "Nikon", 6)))
731 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
733 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
735 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
738 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
739 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
741 /* Pentax & some variant of Nikon */
742 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
744 exif_entry_get_value (em, value, sizeof(value)),
746 return EXIF_DATA_TYPE_MAKER_NOTE_NIKON;
748 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
750 if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
751 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
753 if ((e->size >= 8) && !memcmp (e->data, "QVC", 4)) {
754 return EXIF_DATA_TYPE_MAKER_NOTE_CASIO;
756 if ((e->size >= 12) && !memcmp (e->data, "FUJIFILM", 8)) {
757 return EXIF_DATA_TYPE_MAKER_NOTE_FUJI;
760 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
763 #define LOG_TOO_SMALL \
764 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
765 _("Size of data too small to allow for EXIF data."));
768 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
769 unsigned int ds_orig)
774 const unsigned char *d = d_orig;
775 unsigned int ds = ds_orig, len;
777 if (!data || !data->priv || !d || !ds)
780 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
781 "Parsing %i byte(s) EXIF data...\n", ds);
784 * It can be that the data starts with the EXIF header. If it does
785 * not, search the EXIF marker.
791 if (!memcmp (d, ExifHeader, 6)) {
792 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
793 "Found EXIF header.");
796 while ((d[0] == 0xff) && ds) {
801 /* JPEG_MARKER_SOI */
802 if (d[0] == JPEG_MARKER_SOI) {
808 /* JPEG_MARKER_APP0 */
809 if (d[0] == JPEG_MARKER_APP0) {
812 l = (d[0] << 8) | d[1];
820 /* JPEG_MARKER_APP1 */
821 if (d[0] == JPEG_MARKER_APP1)
824 /* Unknown marker or data. Give up. */
825 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
826 "ExifData", _("EXIF marker not found."));
835 len = (d[0] << 8) | d[1];
836 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
837 "We have to deal with %i byte(s) of EXIF data.",
844 * Verify the exif header
845 * (offset 2, length 6).
851 if (memcmp (d, ExifHeader, 6)) {
852 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
853 "ExifData", _("EXIF header not found."));
857 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
858 "Found EXIF header.");
860 /* Byte order (offset 6, length 2) */
863 if (!memcmp (d + 6, "II", 2))
864 data->priv->order = EXIF_BYTE_ORDER_INTEL;
865 else if (!memcmp (d + 6, "MM", 2))
866 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
868 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
869 "ExifData", _("Unknown encoding."));
874 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
878 offset = exif_get_long (d + 10, data->priv->order);
879 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
880 "IFD 0 at %i.", (int) offset);
882 /* Parse the actual exif data (usually offset 14 from start) */
883 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
886 if (offset + 6 + 2 > ds) {
889 n = exif_get_short (d + 6 + offset, data->priv->order);
890 if (offset + 6 + 2 + 12 * n + 4 > ds) {
893 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
895 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
896 "IFD 1 at %i.", (int) offset);
899 if (offset > ds - 6) {
900 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
901 "ExifData", "Bogus offset of IFD1.");
903 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
908 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
909 * cameras use pointers in the maker note tag that point to the
910 * space between IFDs. Here is the only place where we have access
913 switch (exif_data_get_type_maker_note (data)) {
914 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
915 case EXIF_DATA_TYPE_MAKER_NOTE_NIKON:
916 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
918 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
919 case EXIF_DATA_TYPE_MAKER_NOTE_CASIO:
920 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
922 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
923 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
925 case EXIF_DATA_TYPE_MAKER_NOTE_FUJI:
926 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
933 * If we are able to interpret the maker note, do so.
935 if (data->priv->md) {
936 exif_mnote_data_log (data->priv->md, data->priv->log);
937 exif_mnote_data_set_byte_order (data->priv->md,
939 exif_mnote_data_set_offset (data->priv->md,
940 data->priv->offset_mnote);
941 exif_mnote_data_load (data->priv->md, d, ds);
944 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
945 exif_data_fix (data);
949 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
952 *ds = 0; /* This means something went wrong */
954 if (!data || !d || !ds)
959 *d = exif_data_alloc (data, *ds);
964 memcpy (*d, ExifHeader, 6);
966 /* Order (offset 6) */
967 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
968 memcpy (*d + 6, "II", 2);
970 memcpy (*d + 6, "MM", 2);
973 /* Fixed value (2 bytes, offset 8) */
974 exif_set_short (*d + 8, data->priv->order, 0x002a);
977 * IFD 0 offset (4 bytes, offset 10).
978 * We will start 8 bytes after the
979 * EXIF header (2 bytes for order, another 2 for the test, and
980 * 4 bytes for the IFD 0 offset make 8 bytes together).
982 exif_set_long (*d + 10, data->priv->order, 8);
984 /* Now save IFD 0. IFD 1 will be saved automatically. */
985 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
987 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
989 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
990 "Saved %i byte(s) EXIF data.", *ds);
994 exif_data_new_from_file (const char *path)
999 loader = exif_loader_new ();
1000 exif_loader_write_file (loader, path);
1001 edata = exif_loader_get_data (loader);
1002 exif_loader_unref (loader);
1008 exif_data_ref (ExifData *data)
1013 data->priv->ref_count++;
1017 exif_data_unref (ExifData *data)
1022 data->priv->ref_count--;
1023 if (!data->priv->ref_count)
1024 exif_data_free (data);
1028 exif_data_free (ExifData *data)
1031 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
1036 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1038 exif_content_unref (data->ifd[i]);
1039 data->ifd[i] = NULL;
1044 exif_mem_free (mem, data->data);
1049 if (data->priv->log) {
1050 exif_log_unref (data->priv->log);
1051 data->priv->log = NULL;
1053 if (data->priv->md) {
1054 exif_mnote_data_unref (data->priv->md);
1055 data->priv->md = NULL;
1057 exif_mem_free (mem, data->priv);
1058 exif_mem_free (mem, data);
1061 exif_mem_unref (mem);
1065 exif_data_dump (ExifData *data)
1072 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1073 if (data->ifd[i] && data->ifd[i]->count) {
1074 printf ("Dumping IFD '%s'...\n",
1075 exif_ifd_get_name (i));
1076 exif_content_dump (data->ifd[i], 0);
1081 printf ("%i byte(s) thumbnail data available.", data->size);
1082 if (data->size >= 4) {
1083 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1084 data->data[0], data->data[1],
1085 data->data[data->size - 2],
1086 data->data[data->size - 1]);
1092 exif_data_get_byte_order (ExifData *data)
1097 return (data->priv->order);
1101 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1109 for (i = 0; i < EXIF_IFD_COUNT; i++)
1110 func (data->ifd[i], user_data);
1113 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1114 struct _ByteOrderChangeData {
1115 ExifByteOrder old, new;
1119 entry_set_byte_order (ExifEntry *e, void *data)
1121 ByteOrderChangeData *d = data;
1126 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1130 content_set_byte_order (ExifContent *content, void *data)
1132 exif_content_foreach_entry (content, entry_set_byte_order, data);
1136 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1138 ByteOrderChangeData d;
1140 if (!data || (order == data->priv->order))
1143 d.old = data->priv->order;
1145 exif_data_foreach_content (data, content_set_byte_order, &d);
1146 data->priv->order = order;
1148 exif_mnote_data_set_byte_order (data->priv->md, order);
1152 exif_data_log (ExifData *data, ExifLog *log)
1156 if (!data || !data->priv)
1158 exif_log_unref (data->priv->log);
1159 data->priv->log = log;
1162 for (i = 0; i < EXIF_IFD_COUNT; i++)
1163 exif_content_log (data->ifd[i], log);
1166 /* Used internally within libexif */
1167 ExifLog *exif_data_get_log (ExifData *);
1169 exif_data_get_log (ExifData *data)
1171 if (!data || !data->priv)
1173 return data->priv->log;
1176 static const struct {
1177 ExifDataOption option;
1179 const char *description;
1180 } exif_data_option[] = {
1181 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1182 N_("Ignore unknown tags when loading EXIF data.")},
1183 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1184 N_("Add, correct and remove entries to get EXIF data that follows "
1185 "the specification.")},
1186 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1187 N_("When loading and resaving Exif data, save the maker note unmodified."
1188 " Be aware that the maker note can get corrupted.")},
1193 exif_data_option_get_name (ExifDataOption o)
1197 for (i = 0; exif_data_option[i].name; i++)
1198 if (exif_data_option[i].option == o)
1200 return _(exif_data_option[i].name);
1204 exif_data_option_get_description (ExifDataOption o)
1208 for (i = 0; exif_data_option[i].description; i++)
1209 if (exif_data_option[i].option == o)
1211 return _(exif_data_option[i].description);
1215 exif_data_set_option (ExifData *d, ExifDataOption o)
1220 d->priv->options |= o;
1224 exif_data_unset_option (ExifData *d, ExifDataOption o)
1229 d->priv->options &= ~o;
1233 fix_func (ExifContent *c, void *UNUSED(data))
1235 switch (exif_content_get_ifd (c)) {
1237 if (c->parent->data)
1238 exif_content_fix (c);
1240 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1241 "No thumbnail but entries on thumbnail. These entries have been "
1244 unsigned int cnt = c->count;
1245 exif_content_remove_entry (c, c->entries[c->count - 1]);
1246 if (cnt == c->count) {
1248 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1249 "failed to remove last entry from entries.");
1256 exif_content_fix (c);
1261 exif_data_fix (ExifData *d)
1263 exif_data_foreach_content (d, fix_func, NULL);
1267 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1272 d->priv->data_type = dt;
1276 exif_data_get_data_type (ExifData *d)
1278 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;