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/olympus/exif-mnote-data-olympus.h>
34 #include <libexif/canon/exif-mnote-data-canon.h>
35 #include <libexif/pentax/exif-mnote-data-pentax.h>
41 #if defined(__WATCOMC__) || defined(_MSC_VER)
42 # define strncasecmp strnicmp
45 #undef JPEG_MARKER_SOI
46 #define JPEG_MARKER_SOI 0xd8
47 #undef JPEG_MARKER_APP0
48 #define JPEG_MARKER_APP0 0xe0
49 #undef JPEG_MARKER_APP1
50 #define JPEG_MARKER_APP1 0xe1
52 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
54 struct _ExifDataPrivate
63 unsigned int ref_count;
65 /* Temporarily used while loading data */
66 unsigned int offset_mnote;
68 ExifDataOption options;
69 ExifDataType data_type;
73 exif_data_alloc (ExifData *data, unsigned int i)
80 d = exif_mem_alloc (data->priv->mem, i);
84 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
89 exif_data_get_mnote_data (ExifData *d)
91 return (d && d->priv) ? d->priv->md : NULL;
97 ExifMem *mem = exif_mem_new_default ();
98 ExifData *d = exif_data_new_mem (mem);
100 exif_mem_unref (mem);
106 exif_data_new_mem (ExifMem *mem)
114 data = exif_mem_alloc (mem, sizeof (ExifData));
117 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
119 exif_mem_free (mem, data);
122 data->priv->ref_count = 1;
124 data->priv->mem = mem;
127 for (i = 0; i < EXIF_IFD_COUNT; i++) {
128 data->ifd[i] = exif_content_new_mem (data->priv->mem);
130 exif_data_free (data);
133 data->ifd[i]->parent = data;
136 /* Default options */
137 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
138 exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
140 /* Default data type: none */
141 exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
147 exif_data_new_from_data (const unsigned char *data, unsigned int size)
151 edata = exif_data_new ();
152 exif_data_load_data (edata, data, size);
157 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
158 const unsigned char *d,
159 unsigned int size, unsigned int offset)
161 unsigned int s, doff;
163 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
164 entry->format = exif_get_short (d + offset + 2, data->priv->order);
165 entry->components = exif_get_long (d + offset + 4, data->priv->order);
167 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
168 "Loading entry 0x%x ('%s')...", entry->tag,
169 exif_tag_get_name (entry->tag));
171 /* {0,1,2,4,8} x { 0x00000000 .. 0xffffffff }
172 * -> { 0x000000000 .. 0x7fffffff8 } */
173 s = exif_format_get_size(entry->format) * entry->components;
174 if (s < entry->components) {
180 * Size? If bigger than 4 bytes, the actual data is not
181 * in the entry but somewhere else (offset).
184 doff = exif_get_long (d + offset + 8, data->priv->order);
189 if ((doff + s < doff) || (doff + s < s))
194 entry->data = exif_data_alloc (data, s);
197 memcpy (entry->data, d + doff, s);
199 /* FIXME: What do our callers do if (entry->data == NULL)? */
200 EXIF_LOG_NO_MEMORY(data->priv->log, "ExifData", s);
203 /* If this is the MakerNote, remember the offset */
204 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
206 exif_log (data->priv->log,
207 EXIF_LOG_CODE_DEBUG, "ExifData",
208 "MakerNote found with NULL data");
209 } else if (entry->size > 6) {
210 exif_log (data->priv->log,
211 EXIF_LOG_CODE_DEBUG, "ExifData",
212 "MakerNote found (%02x %02x %02x %02x "
213 "%02x %02x %02x...).",
214 entry->data[0], entry->data[1], entry->data[2],
215 entry->data[3], entry->data[4], entry->data[5],
218 data->priv->offset_mnote = doff;
224 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
225 unsigned char **d, unsigned int *ds,
228 unsigned int doff, s;
230 if (!data || !data->priv)
234 * Each entry is 12 bytes long. The memory for the entry has
235 * already been allocated.
237 exif_set_short (*d + 6 + offset + 0,
238 data->priv->order, (ExifShort) e->tag);
239 exif_set_short (*d + 6 + offset + 2,
240 data->priv->order, (ExifShort) e->format);
242 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
243 /* If this is the maker note tag, update it. */
244 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
245 exif_mem_free (data->priv->mem, e->data);
248 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
249 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
250 e->components = e->size;
254 exif_set_long (*d + 6 + offset + 4,
255 data->priv->order, e->components);
258 * Size? If bigger than 4 bytes, the actual data is not in
259 * the entry but somewhere else.
261 s = exif_format_get_size (e->format) * e->components;
267 * According to the TIFF specification,
268 * the offset must be an even number. If we need to introduce
269 * a padding byte, we set it to 0.
273 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
275 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
278 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
280 *(*d + *ds - 1) = '\0';
285 /* Write the data. Fill unneeded bytes with 0. */
286 memcpy (*d + 6 + doff, e->data, s);
288 memset (*d + 6 + doff + s, 0, (4 - s));
292 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
293 unsigned int ds, ExifLong offset, ExifLong size)
295 if (ds < offset + size) {
296 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
297 "Bogus thumbnail offset and size: %i < %i + %i.",
298 (int) ds, (int) offset, (int) size);
302 exif_mem_free (data->priv->mem, data->data);
304 data->data = exif_data_alloc (data, data->size);
307 memcpy (data->data, d + offset, data->size);
311 #define CHECK_REC(i) \
313 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
314 "ExifData", "Recursive entry in IFD " \
315 "'%s' detected. Skipping...", \
316 exif_ifd_get_name (i)); \
319 if (data->ifd[(i)]->count) { \
320 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
321 "ExifData", "Attempt to load IFD " \
322 "'%s' multiple times detected. " \
324 exif_ifd_get_name (i)); \
329 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
330 const unsigned char *d,
331 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
333 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
339 if (!data || !data->priv)
342 /* check for valid ExifIfd enum range */
343 if (( ((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
346 if (recursion_depth > 150) {
347 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
348 "Deep recursion detected!");
352 /* Read the number of entries */
353 if (offset >= ds - 1)
355 n = exif_get_short (d + offset, data->priv->order);
356 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
357 "Loading %i entries...", n);
360 /* Check if we have enough data. */
361 if (offset + 12 * n > ds)
362 n = (ds - offset) / 12;
364 for (i = 0; i < n; i++) {
366 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
368 case EXIF_TAG_EXIF_IFD_POINTER:
369 case EXIF_TAG_GPS_INFO_IFD_POINTER:
370 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
371 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
372 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
373 o = exif_get_long (d + offset + 12 * i + 8,
376 case EXIF_TAG_EXIF_IFD_POINTER:
377 CHECK_REC (EXIF_IFD_EXIF);
378 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
380 case EXIF_TAG_GPS_INFO_IFD_POINTER:
381 CHECK_REC (EXIF_IFD_GPS);
382 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
384 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
385 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
386 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
388 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
389 thumbnail_offset = o;
390 if (thumbnail_offset && thumbnail_length)
391 exif_data_load_data_thumbnail (data, d,
392 ds, thumbnail_offset,
395 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
396 thumbnail_length = o;
397 if (thumbnail_offset && thumbnail_length)
398 exif_data_load_data_thumbnail (data, d,
399 ds, thumbnail_offset,
409 * If we don't know the tag, don't fail. It could be that new
410 * versions of the standard have defined additional tags. Note that
411 * 0 is a valid tag in the GPS IFD.
413 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
416 * Special case: Tag and format 0. That's against specification.
417 * At least up to 2.2. But Photoshop writes it anyways.
419 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
420 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
421 "Skipping empty entry at position %i in '%s'.", i,
422 exif_ifd_get_name (ifd));
425 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
426 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
427 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
428 exif_ifd_get_name (ifd));
429 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
432 entry = exif_entry_new_mem (data->priv->mem);
433 if (exif_data_load_data_entry (data, entry, d, ds,
435 exif_content_add_entry (data->ifd[ifd], entry);
436 exif_entry_unref (entry);
443 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
445 ExifShort tag1 = exif_get_short (p1, o);
446 ExifShort tag2 = exif_get_short (p2, o);
448 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
452 cmp_func_intel (const void *elem1, const void *elem2)
454 return cmp_func ((const unsigned char *) elem1,
455 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
459 cmp_func_motorola (const void *elem1, const void *elem2)
461 return cmp_func ((const unsigned char *) elem1,
462 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
466 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
467 unsigned char **d, unsigned int *ds,
470 unsigned int j, n_ptr = 0, n_thumb = 0;
473 if (!data || !data->priv || !ifd || !d || !ds)
476 for (i = 0; i < EXIF_IFD_COUNT; i++)
477 if (ifd == data->ifd[i])
479 if (i == EXIF_IFD_COUNT)
483 * Check if we need some extra entries for pointers or the thumbnail.
489 * The pointer to IFD_EXIF is in IFD_0. The pointer to
490 * IFD_INTEROPERABILITY is in IFD_EXIF.
492 if (data->ifd[EXIF_IFD_EXIF]->count ||
493 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
496 /* The pointer to IFD_GPS is in IFD_0. */
497 if (data->ifd[EXIF_IFD_GPS]->count)
506 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
513 * Allocate enough memory for all entries
514 * and the number of entries.
516 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
517 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
519 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
523 /* Save the number of entries */
524 exif_set_short (*d + 6 + offset, data->priv->order,
525 (ExifShort) (ifd->count + n_ptr + n_thumb));
528 /* Save each entry */
529 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
530 "Saving %i entries (IFD '%s', offset: %i)...",
531 ifd->count, exif_ifd_get_name (i), offset);
532 for (j = 0; j < ifd->count; j++)
533 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
535 offset += 12 * ifd->count;
537 /* Now save special entries. */
542 * The pointer to IFD_EXIF is in IFD_0.
543 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
544 * therefore, if IFD_INTEROPERABILITY is not empty, we need
545 * IFD_EXIF even if latter is empty.
547 if (data->ifd[EXIF_IFD_EXIF]->count ||
548 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
549 exif_set_short (*d + 6 + offset + 0, data->priv->order,
550 EXIF_TAG_EXIF_IFD_POINTER);
551 exif_set_short (*d + 6 + offset + 2, data->priv->order,
553 exif_set_long (*d + 6 + offset + 4, data->priv->order,
555 exif_set_long (*d + 6 + offset + 8, data->priv->order,
557 exif_data_save_data_content (data,
558 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
562 /* The pointer to IFD_GPS is in IFD_0, too. */
563 if (data->ifd[EXIF_IFD_GPS]->count) {
564 exif_set_short (*d + 6 + offset + 0, data->priv->order,
565 EXIF_TAG_GPS_INFO_IFD_POINTER);
566 exif_set_short (*d + 6 + offset + 2, data->priv->order,
568 exif_set_long (*d + 6 + offset + 4, data->priv->order,
570 exif_set_long (*d + 6 + offset + 8, data->priv->order,
572 exif_data_save_data_content (data,
573 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
581 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
584 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
585 exif_set_short (*d + 6 + offset + 0, data->priv->order,
586 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
587 exif_set_short (*d + 6 + offset + 2, data->priv->order,
589 exif_set_long (*d + 6 + offset + 4, data->priv->order,
591 exif_set_long (*d + 6 + offset + 8, data->priv->order,
593 exif_data_save_data_content (data,
594 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
603 * Information about the thumbnail (if any) is saved in
608 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
609 exif_set_short (*d + 6 + offset + 0, data->priv->order,
610 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
611 exif_set_short (*d + 6 + offset + 2, data->priv->order,
613 exif_set_long (*d + 6 + offset + 4, data->priv->order,
615 exif_set_long (*d + 6 + offset + 8, data->priv->order,
618 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
620 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
624 memcpy (*d + *ds - data->size, data->data, data->size);
627 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
628 exif_set_short (*d + 6 + offset + 0, data->priv->order,
629 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
630 exif_set_short (*d + 6 + offset + 2, data->priv->order,
632 exif_set_long (*d + 6 + offset + 4, data->priv->order,
634 exif_set_long (*d + 6 + offset + 8, data->priv->order,
644 /* Sort the directory according to TIFF specification */
645 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
646 (ifd->count + n_ptr + n_thumb), 12,
647 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
649 /* Correctly terminate the directory */
650 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
654 * We are saving IFD 0. Tell where IFD 1 starts and save
657 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
658 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
661 exif_set_long (*d + 6 + offset, data->priv->order, 0);
665 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
666 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
667 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
668 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
669 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
670 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5
671 } ExifDataTypeMakerNote;
673 static ExifDataTypeMakerNote
674 exif_data_get_type_maker_note (ExifData *d)
680 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
682 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
684 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
686 /* Olympus & Nikon */
687 if ((e->size >= 8) && (!memcmp (e->data, "OLYMP", 6) ||
688 !memcmp (e->data, "OLYMPUS", 8) || !memcmp (e->data, "Nikon", 6)))
689 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
691 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
693 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
696 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
697 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
699 /* Pentax & some variant of Nikon */
700 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
702 exif_entry_get_value (em, value, sizeof(value)),
704 return EXIF_DATA_TYPE_MAKER_NOTE_NIKON;
706 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
708 if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
709 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
711 if ((e->size >= 8) && !memcmp (e->data, "QVC", 4)) {
712 return EXIF_DATA_TYPE_MAKER_NOTE_CASIO;
715 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
718 #define LOG_TOO_SMALL \
719 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
720 _("Size of data too small to allow for EXIF data."));
723 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
724 unsigned int ds_orig)
729 const unsigned char *d = d_orig;
730 unsigned int ds = ds_orig, len;
732 if (!data || !data->priv || !d || !ds)
735 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
736 "Parsing %i byte(s) EXIF data...\n", ds);
739 * It can be that the data starts with the EXIF header. If it does
740 * not, search the EXIF marker.
746 if (!memcmp (d, ExifHeader, 6)) {
747 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
748 "Found EXIF header.");
751 while ((d[0] == 0xff) && ds) {
756 /* JPEG_MARKER_SOI */
757 if (d[0] == JPEG_MARKER_SOI) {
763 /* JPEG_MARKER_APP0 */
764 if (d[0] == JPEG_MARKER_APP0) {
767 l = (d[0] << 8) | d[1];
775 /* JPEG_MARKER_APP1 */
776 if (d[0] == JPEG_MARKER_APP1)
779 /* Unknown marker or data. Give up. */
780 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
781 "ExifData", _("EXIF marker not found."));
790 len = (d[0] << 8) | d[1];
791 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
792 "We have to deal with %i byte(s) of EXIF data.",
799 * Verify the exif header
800 * (offset 2, length 6).
806 if (memcmp (d, ExifHeader, 6)) {
807 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
808 "ExifData", _("EXIF header not found."));
812 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
813 "Found EXIF header.");
815 /* Byte order (offset 6, length 2) */
818 if (!memcmp (d + 6, "II", 2))
819 data->priv->order = EXIF_BYTE_ORDER_INTEL;
820 else if (!memcmp (d + 6, "MM", 2))
821 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
823 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
824 "ExifData", _("Unknown encoding."));
829 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
833 offset = exif_get_long (d + 10, data->priv->order);
834 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
835 "IFD 0 at %i.", (int) offset);
837 /* Parse the actual exif data (usually offset 14 from start) */
838 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
841 if (offset + 6 + 2 > ds) {
844 n = exif_get_short (d + 6 + offset, data->priv->order);
845 if (offset + 6 + 2 + 12 * n + 4 > ds) {
848 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
850 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
851 "IFD 1 at %i.", (int) offset);
854 if (offset > ds - 6) {
855 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
856 "ExifData", "Bogus offset of IFD1.");
858 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
863 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
864 * cameras use pointers in the maker note tag that point to the
865 * space between IFDs. Here is the only place where we have access
868 switch (exif_data_get_type_maker_note (data)) {
869 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
870 case EXIF_DATA_TYPE_MAKER_NOTE_NIKON:
871 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
873 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
874 case EXIF_DATA_TYPE_MAKER_NOTE_CASIO:
875 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
877 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
878 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
885 * If we are able to interpret the maker note, do so.
887 if (data->priv->md) {
888 exif_mnote_data_log (data->priv->md, data->priv->log);
889 exif_mnote_data_set_byte_order (data->priv->md,
891 exif_mnote_data_set_offset (data->priv->md,
892 data->priv->offset_mnote);
893 exif_mnote_data_load (data->priv->md, d, ds);
896 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
897 exif_data_fix (data);
901 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
903 if (!data || !d || !ds)
908 *d = exif_data_alloc (data, *ds);
911 memcpy (*d, ExifHeader, 6);
913 /* Order (offset 6) */
914 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
915 memcpy (*d + 6, "II", 2);
917 memcpy (*d + 6, "MM", 2);
920 /* Fixed value (2 bytes, offset 8) */
921 exif_set_short (*d + 8, data->priv->order, 0x002a);
924 * IFD 0 offset (4 bytes, offset 10).
925 * We will start 8 bytes after the
926 * EXIF header (2 bytes for order, another 2 for the test, and
927 * 4 bytes for the IFD 0 offset make 8 bytes together).
929 exif_set_long (*d + 10, data->priv->order, 8);
931 /* Now save IFD 0. IFD 1 will be saved automatically. */
932 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
934 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
936 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
937 "Saved %i byte(s) EXIF data.", *ds);
941 exif_data_new_from_file (const char *path)
946 loader = exif_loader_new ();
947 exif_loader_write_file (loader, path);
948 edata = exif_loader_get_data (loader);
949 exif_loader_unref (loader);
955 exif_data_ref (ExifData *data)
960 data->priv->ref_count++;
964 exif_data_unref (ExifData *data)
969 data->priv->ref_count--;
970 if (!data->priv->ref_count)
971 exif_data_free (data);
975 exif_data_free (ExifData *data)
978 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
983 for (i = 0; i < EXIF_IFD_COUNT; i++) {
985 exif_content_unref (data->ifd[i]);
991 exif_mem_free (mem, data->data);
996 if (data->priv->log) {
997 exif_log_unref (data->priv->log);
998 data->priv->log = NULL;
1000 if (data->priv->md) {
1001 exif_mnote_data_unref (data->priv->md);
1002 data->priv->md = NULL;
1004 exif_mem_free (mem, data->priv);
1005 exif_mem_free (mem, data);
1008 exif_mem_unref (mem);
1012 exif_data_dump (ExifData *data)
1019 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1020 if (data->ifd[i] && data->ifd[i]->count) {
1021 printf ("Dumping IFD '%s'...\n",
1022 exif_ifd_get_name (i));
1023 exif_content_dump (data->ifd[i], 0);
1028 printf ("%i byte(s) thumbnail data available.", data->size);
1029 if (data->size >= 4) {
1030 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1031 data->data[0], data->data[1],
1032 data->data[data->size - 2],
1033 data->data[data->size - 1]);
1039 exif_data_get_byte_order (ExifData *data)
1044 return (data->priv->order);
1048 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1056 for (i = 0; i < EXIF_IFD_COUNT; i++)
1057 func (data->ifd[i], user_data);
1060 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1061 struct _ByteOrderChangeData {
1062 ExifByteOrder old, new;
1066 entry_set_byte_order (ExifEntry *e, void *data)
1068 ByteOrderChangeData *d = data;
1073 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1077 content_set_byte_order (ExifContent *content, void *data)
1079 exif_content_foreach_entry (content, entry_set_byte_order, data);
1083 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1085 ByteOrderChangeData d;
1087 if (!data || (order == data->priv->order))
1090 d.old = data->priv->order;
1092 exif_data_foreach_content (data, content_set_byte_order, &d);
1093 data->priv->order = order;
1095 exif_mnote_data_set_byte_order (data->priv->md, order);
1099 exif_data_log (ExifData *data, ExifLog *log)
1103 if (!data || !data->priv)
1105 exif_log_unref (data->priv->log);
1106 data->priv->log = log;
1109 for (i = 0; i < EXIF_IFD_COUNT; i++)
1110 exif_content_log (data->ifd[i], log);
1113 /* Used internally within libexif */
1114 ExifLog *exif_data_get_log (ExifData *);
1116 exif_data_get_log (ExifData *data)
1118 if (!data || !data->priv)
1120 return data->priv->log;
1123 static const struct {
1124 ExifDataOption option;
1126 const char *description;
1127 } exif_data_option[] = {
1128 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1129 N_("Ignore unknown tags when loading EXIF data.")},
1130 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1131 N_("Add, correct and remove entries to get EXIF data that follows "
1132 "the specification.")},
1133 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1134 N_("When loading and resaving Exif data, save the maker note unmodified."
1135 " Be aware that the maker note can get corrupted.")},
1140 exif_data_option_get_name (ExifDataOption o)
1144 for (i = 0; exif_data_option[i].name; i++)
1145 if (exif_data_option[i].option == o)
1147 return _(exif_data_option[i].name);
1151 exif_data_option_get_description (ExifDataOption o)
1155 for (i = 0; exif_data_option[i].description; i++)
1156 if (exif_data_option[i].option == o)
1158 return _(exif_data_option[i].description);
1162 exif_data_set_option (ExifData *d, ExifDataOption o)
1167 d->priv->options |= o;
1171 exif_data_unset_option (ExifData *d, ExifDataOption o)
1176 d->priv->options &= ~o;
1180 fix_func (ExifContent *c, void *UNUSED(data))
1182 switch (exif_content_get_ifd (c)) {
1184 if (c->parent->data)
1185 exif_content_fix (c);
1187 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1188 "No thumbnail but entries on thumbnail. These entries have been "
1191 exif_content_remove_entry (c, c->entries[c->count - 1]);
1195 exif_content_fix (c);
1200 exif_data_fix (ExifData *d)
1202 exif_data_foreach_content (d, fix_func, NULL);
1206 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1211 d->priv->data_type = dt;
1215 exif_data_get_data_type (ExifData *d)
1217 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;