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., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301 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 #undef JPEG_MARKER_SOI
43 #define JPEG_MARKER_SOI 0xd8
44 #undef JPEG_MARKER_APP0
45 #define JPEG_MARKER_APP0 0xe0
46 #undef JPEG_MARKER_APP1
47 #define JPEG_MARKER_APP1 0xe1
49 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
51 struct _ExifDataPrivate
60 unsigned int ref_count;
62 /* Temporarily used while loading data */
63 unsigned int offset_mnote;
65 ExifDataOption options;
66 ExifDataType data_type;
70 exif_data_alloc (ExifData *data, unsigned int i)
77 d = exif_mem_alloc (data->priv->mem, i);
81 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
86 exif_data_get_mnote_data (ExifData *d)
88 return (d && d->priv) ? d->priv->md : NULL;
94 ExifMem *mem = exif_mem_new_default ();
95 ExifData *d = exif_data_new_mem (mem);
103 exif_data_new_mem (ExifMem *mem)
111 data = exif_mem_alloc (mem, sizeof (ExifData));
114 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
116 exif_mem_free (mem, data);
119 data->priv->ref_count = 1;
121 data->priv->mem = mem;
124 for (i = 0; i < EXIF_IFD_COUNT; i++) {
125 data->ifd[i] = exif_content_new_mem (data->priv->mem);
127 exif_data_free (data);
130 data->ifd[i]->parent = data;
133 /* Default options */
134 #ifndef NO_VERBOSE_TAG_STRINGS
136 * When the tag list is compiled away, setting this option prevents
137 * any tags from being loaded
139 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
141 exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
143 /* Default data type: none */
144 exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
150 exif_data_new_from_data (const unsigned char *data, unsigned int size)
152 ExifData *edata = NULL;
154 edata = exif_data_new ();
155 exif_data_load_data (edata, data, size);
160 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
161 const unsigned char *d,
162 unsigned int size, unsigned int offset)
164 unsigned int s, doff;
166 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
167 entry->format = exif_get_short (d + offset + 2, data->priv->order);
168 entry->components = exif_get_long (d + offset + 4, data->priv->order);
170 /* FIXME: should use exif_tag_get_name_in_ifd here but entry->parent
171 * has not been set yet
173 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
174 "Loading entry 0x%x ('%s')...", entry->tag,
175 exif_tag_get_name (entry->tag));
177 /* {0,1,2,4,8} x { 0x00000000 .. 0xffffffff }
178 * -> { 0x000000000 .. 0x7fffffff8 } */
179 s = exif_format_get_size(entry->format) * entry->components;
180 if ((s < entry->components) || (s == 0)){
185 * Size? If bigger than 4 bytes, the actual data is not
186 * in the entry but somewhere else (offset).
189 doff = exif_get_long (d + offset + 8, data->priv->order);
194 if ((doff + s < doff) || (doff + s < s) || (doff + s > size)) {
195 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
196 "Tag data past end of buffer (%u > %u)", doff+s, size);
200 entry->data = exif_data_alloc (data, s);
203 memcpy (entry->data, d + doff, s);
205 /* FIXME: What do our callers do if (entry->data == NULL)? */
206 EXIF_LOG_NO_MEMORY(data->priv->log, "ExifData", s);
209 /* If this is the MakerNote, remember the offset */
210 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
212 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
213 "MakerNote found with empty data");
214 } else if (entry->size > 6) {
215 exif_log (data->priv->log,
216 EXIF_LOG_CODE_DEBUG, "ExifData",
217 "MakerNote found (%02x %02x %02x %02x "
218 "%02x %02x %02x...).",
219 entry->data[0], entry->data[1], entry->data[2],
220 entry->data[3], entry->data[4], entry->data[5],
223 data->priv->offset_mnote = doff;
229 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
230 unsigned char **d, unsigned int *ds,
233 unsigned int doff, s;
236 if (!data || !data->priv)
240 * Each entry is 12 bytes long. The memory for the entry has
241 * already been allocated.
243 exif_set_short (*d + 6 + offset + 0,
244 data->priv->order, (ExifShort) e->tag);
245 exif_set_short (*d + 6 + offset + 2,
246 data->priv->order, (ExifShort) e->format);
248 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
249 /* If this is the maker note tag, update it. */
250 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
251 /* TODO: this is using the wrong ExifMem to free e->data */
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;
258 if (exif_format_get_size (e->format) != 1) {
259 /* e->format is taken from input code,
260 * but we need to make sure it is a 1 byte
261 * entity due to the multiplication below. */
262 e->format = EXIF_FORMAT_UNDEFINED;
267 exif_set_long (*d + 6 + offset + 4,
268 data->priv->order, e->components);
271 * Size? If bigger than 4 bytes, the actual data is not in
272 * the entry but somewhere else.
274 s = exif_format_get_size (e->format) * e->components;
281 * According to the TIFF specification,
282 * the offset must be an even number. If we need to introduce
283 * a padding byte, we set it to 0.
287 t = exif_mem_realloc (data->priv->mem, *d, ts);
289 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
294 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
296 *(*d + *ds - 1) = '\0';
301 /* Write the data. Fill unneeded bytes with 0. Do not crash with
304 memcpy (*d + 6 + doff, e->data, s);
306 memset (*d + 6 + doff, 0, s);
309 memset (*d + 6 + doff + s, 0, (4 - s));
313 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
314 unsigned int ds, ExifLong o, ExifLong s)
317 if ((o + s < o) || (o + s < s) || (o + s > ds) || (o > ds)) {
318 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
319 "Bogus thumbnail offset (%u) or size (%u).",
325 exif_mem_free (data->priv->mem, data->data);
326 if (!(data->data = exif_data_alloc (data, s))) {
327 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", s);
332 memcpy (data->data, d + o, s);
336 #define CHECK_REC(i) \
338 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
339 "ExifData", "Recursive entry in IFD " \
340 "'%s' detected. Skipping...", \
341 exif_ifd_get_name (i)); \
344 if (data->ifd[(i)]->count) { \
345 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
346 "ExifData", "Attempt to load IFD " \
347 "'%s' multiple times detected. " \
349 exif_ifd_get_name (i)); \
353 /*! Load data for an IFD.
355 * \param[in,out] data #ExifData
356 * \param[in] ifd IFD to load
357 * \param[in] d pointer to buffer containing raw IFD data
358 * \param[in] ds size of raw data in buffer at \c d
359 * \param[in] offset offset into buffer at \c d at which IFD starts
360 * \param[in] recursion_depth number of times this function has been
361 * recursively called without returning
364 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
365 const unsigned char *d,
366 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
368 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
374 if (!data || !data->priv)
377 /* check for valid ExifIfd enum range */
378 if ((((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
381 if (recursion_depth > 30) {
382 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
383 "Deep recursion detected!");
387 /* Read the number of entries */
388 if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) {
389 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
390 "Tag data past end of buffer (%u > %u)", offset+2, ds);
393 n = exif_get_short (d + offset, data->priv->order);
394 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
395 "Loading %hu entries...", n);
398 /* Check if we have enough data. */
399 if (offset + 12 * n > ds) {
400 n = (ds - offset) / 12;
401 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
402 "Short data; only loading %hu entries...", n);
405 for (i = 0; i < n; i++) {
407 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
409 case EXIF_TAG_EXIF_IFD_POINTER:
410 case EXIF_TAG_GPS_INFO_IFD_POINTER:
411 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
412 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
413 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
414 o = exif_get_long (d + offset + 12 * i + 8,
416 /* FIXME: IFD_POINTER tags aren't marked as being in a
417 * specific IFD, so exif_tag_get_name_in_ifd won't work
419 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
420 "Sub-IFD entry 0x%x ('%s') at %u.", tag,
421 exif_tag_get_name(tag), o);
423 case EXIF_TAG_EXIF_IFD_POINTER:
424 CHECK_REC (EXIF_IFD_EXIF);
425 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
427 case EXIF_TAG_GPS_INFO_IFD_POINTER:
428 CHECK_REC (EXIF_IFD_GPS);
429 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
431 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
432 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
433 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
435 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
436 thumbnail_offset = o;
437 if (thumbnail_offset && thumbnail_length)
438 exif_data_load_data_thumbnail (data, d,
439 ds, thumbnail_offset,
442 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
443 thumbnail_length = o;
444 if (thumbnail_offset && thumbnail_length)
445 exif_data_load_data_thumbnail (data, d,
446 ds, thumbnail_offset,
456 * If we don't know the tag, don't fail. It could be that new
457 * versions of the standard have defined additional tags. Note that
458 * 0 is a valid tag in the GPS IFD.
460 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
463 * Special case: Tag and format 0. That's against specification
464 * (at least up to 2.2). But Photoshop writes it anyways.
466 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
467 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
468 "Skipping empty entry at position %u in '%s'.", i,
469 exif_ifd_get_name (ifd));
472 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
473 "Unknown tag 0x%04x (entry %u in '%s'). Please report this tag "
474 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
475 exif_ifd_get_name (ifd));
476 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
479 entry = exif_entry_new_mem (data->priv->mem);
480 if (exif_data_load_data_entry (data, entry, d, ds,
482 exif_content_add_entry (data->ifd[ifd], entry);
483 exif_entry_unref (entry);
490 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
492 ExifShort tag1 = exif_get_short (p1, o);
493 ExifShort tag2 = exif_get_short (p2, o);
495 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
499 cmp_func_intel (const void *elem1, const void *elem2)
501 return cmp_func ((const unsigned char *) elem1,
502 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
506 cmp_func_motorola (const void *elem1, const void *elem2)
508 return cmp_func ((const unsigned char *) elem1,
509 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
513 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
514 unsigned char **d, unsigned int *ds,
517 unsigned int j, n_ptr = 0, n_thumb = 0;
522 if (!data || !data->priv || !ifd || !d || !ds)
525 for (i = 0; i < EXIF_IFD_COUNT; i++)
526 if (ifd == data->ifd[i])
528 if (i == EXIF_IFD_COUNT)
532 * Check if we need some extra entries for pointers or the thumbnail.
538 * The pointer to IFD_EXIF is in IFD_0. The pointer to
539 * IFD_INTEROPERABILITY is in IFD_EXIF.
541 if (data->ifd[EXIF_IFD_EXIF]->count ||
542 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
545 /* The pointer to IFD_GPS is in IFD_0. */
546 if (data->ifd[EXIF_IFD_GPS]->count)
555 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
562 * Allocate enough memory for all entries
563 * and the number of entries.
565 ts = *ds + (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
566 t = exif_mem_realloc (data->priv->mem, *d, ts);
568 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
574 /* Save the number of entries */
575 exif_set_short (*d + 6 + offset, data->priv->order,
576 (ExifShort) (ifd->count + n_ptr + n_thumb));
580 * Save each entry. Make sure that no memcpys from NULL pointers are
583 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
584 "Saving %i entries (IFD '%s', offset: %i)...",
585 ifd->count, exif_ifd_get_name (i), offset);
586 for (j = 0; j < ifd->count; j++) {
587 if (ifd->entries[j]) {
588 exif_data_save_data_entry (data, ifd->entries[j], d, ds,
593 offset += 12 * ifd->count;
595 /* Now save special entries. */
600 * The pointer to IFD_EXIF is in IFD_0.
601 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
602 * therefore, if IFD_INTEROPERABILITY is not empty, we need
603 * IFD_EXIF even if latter is empty.
605 if (data->ifd[EXIF_IFD_EXIF]->count ||
606 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
607 exif_set_short (*d + 6 + offset + 0, data->priv->order,
608 EXIF_TAG_EXIF_IFD_POINTER);
609 exif_set_short (*d + 6 + offset + 2, data->priv->order,
611 exif_set_long (*d + 6 + offset + 4, data->priv->order,
613 exif_set_long (*d + 6 + offset + 8, data->priv->order,
615 exif_data_save_data_content (data,
616 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
620 /* The pointer to IFD_GPS is in IFD_0, too. */
621 if (data->ifd[EXIF_IFD_GPS]->count) {
622 exif_set_short (*d + 6 + offset + 0, data->priv->order,
623 EXIF_TAG_GPS_INFO_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_GPS], d, ds, *ds - 6);
639 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
642 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
643 exif_set_short (*d + 6 + offset + 0, data->priv->order,
644 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
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,
651 exif_data_save_data_content (data,
652 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
661 * Information about the thumbnail (if any) is saved in
666 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
667 exif_set_short (*d + 6 + offset + 0, data->priv->order,
668 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
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,
675 ts = *ds + data->size;
676 t = exif_mem_realloc (data->priv->mem, *d, ts);
678 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
684 memcpy (*d + *ds - data->size, data->data, data->size);
687 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
688 exif_set_short (*d + 6 + offset + 0, data->priv->order,
689 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
690 exif_set_short (*d + 6 + offset + 2, data->priv->order,
692 exif_set_long (*d + 6 + offset + 4, data->priv->order,
694 exif_set_long (*d + 6 + offset + 8, data->priv->order,
704 /* Sort the directory according to TIFF specification */
705 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
706 (ifd->count + n_ptr + n_thumb), 12,
707 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
709 /* Correctly terminate the directory */
710 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
714 * We are saving IFD 0. Tell where IFD 1 starts and save
717 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
718 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
721 exif_set_long (*d + 6 + offset, data->priv->order, 0);
725 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
726 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
727 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
728 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
729 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
730 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5,
731 EXIF_DATA_TYPE_MAKER_NOTE_FUJI = 6
732 } ExifDataTypeMakerNote;
734 /*! If MakerNote is recognized, load it.
736 * \param[in,out] data #ExifData
737 * \param[in] d pointer to raw EXIF data
738 * \param[in] ds length of data at d
741 interpret_maker_note(ExifData *data, const unsigned char *d, unsigned int ds)
744 ExifEntry* e = exif_data_get_entry (data, EXIF_TAG_MAKER_NOTE);
748 if ((mnoteid = exif_mnote_data_olympus_identify (data, e)) != 0) {
749 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
750 "ExifData", "Olympus MakerNote variant type %d", mnoteid);
751 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
753 } else if ((mnoteid = exif_mnote_data_canon_identify (data, e)) != 0) {
754 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
755 "ExifData", "Canon MakerNote variant type %d", mnoteid);
756 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
758 } else if ((mnoteid = exif_mnote_data_fuji_identify (data, e)) != 0) {
759 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
760 "ExifData", "Fuji MakerNote variant type %d", mnoteid);
761 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
763 /* NOTE: Must do Pentax detection last because some of the
764 * heuristics are pretty general. */
765 } else if ((mnoteid = exif_mnote_data_pentax_identify (data, e)) != 0) {
766 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
767 "ExifData", "Pentax MakerNote variant type %d", mnoteid);
768 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
772 * If we are able to interpret the maker note, do so.
774 if (data->priv->md) {
775 exif_mnote_data_log (data->priv->md, data->priv->log);
776 exif_mnote_data_set_byte_order (data->priv->md,
778 exif_mnote_data_set_offset (data->priv->md,
779 data->priv->offset_mnote);
780 exif_mnote_data_load (data->priv->md, d, ds);
784 #define LOG_TOO_SMALL \
785 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
786 _("Size of data too small to allow for EXIF data."));
789 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
795 const unsigned char *d = d_orig;
796 unsigned int len, fullds;
798 if (!data || !data->priv || !d || !ds)
801 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
802 "Parsing %i byte(s) EXIF data...\n", ds);
805 * It can be that the data starts with the EXIF header. If it does
806 * not, search the EXIF marker.
812 if (!memcmp (d, ExifHeader, 6)) {
813 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
814 "Found EXIF header.");
817 while (ds && (d[0] == 0xff)) {
822 /* JPEG_MARKER_SOI */
823 if (ds && d[0] == JPEG_MARKER_SOI) {
829 /* JPEG_MARKER_APP0 */
830 if (ds >= 3 && d[0] == JPEG_MARKER_APP0) {
833 l = (d[0] << 8) | d[1];
841 /* JPEG_MARKER_APP1 */
842 if (ds && d[0] == JPEG_MARKER_APP1)
845 /* Unknown marker or data. Give up. */
846 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
847 "ExifData", _("EXIF marker not found."));
856 len = (d[0] << 8) | d[1];
857 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
858 "We have to deal with %i byte(s) of EXIF data.",
865 * Verify the exif header
866 * (offset 2, length 6).
872 if (memcmp (d, ExifHeader, 6)) {
873 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
874 "ExifData", _("EXIF header not found."));
878 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
879 "Found EXIF header.");
881 /* Sanity check the data length */
885 /* The JPEG APP1 section can be no longer than 64 KiB (including a
886 16-bit length), so cap the data length to protect against overflow
887 in future offset calculations */
892 /* Byte order (offset 6, length 2) */
893 if (!memcmp (d + 6, "II", 2))
894 data->priv->order = EXIF_BYTE_ORDER_INTEL;
895 else if (!memcmp (d + 6, "MM", 2))
896 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
898 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
899 "ExifData", _("Unknown encoding."));
904 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
908 offset = exif_get_long (d + 10, data->priv->order);
909 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
910 "IFD 0 at %i.", (int) offset);
912 /* Sanity check the offset, being careful about overflow */
913 if (offset > ds || offset + 6 + 2 > ds)
916 /* Parse the actual exif data (usually offset 14 from start) */
917 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
920 n = exif_get_short (d + 6 + offset, data->priv->order);
921 if (offset + 6 + 2 + 12 * n + 4 > ds)
924 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
926 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
927 "IFD 1 at %i.", (int) offset);
930 if (offset > ds || offset + 6 > ds) {
931 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
932 "ExifData", "Bogus offset of IFD1.");
934 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
939 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
940 * cameras use pointers in the maker note tag that point to the
941 * space between IFDs. Here is the only place where we have access
944 interpret_maker_note(data, d, fullds);
946 /* Fixup tags if requested */
947 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
948 exif_data_fix (data);
952 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
955 *ds = 0; /* This means something went wrong */
957 if (!data || !d || !ds)
962 *d = exif_data_alloc (data, *ds);
967 memcpy (*d, ExifHeader, 6);
969 /* Order (offset 6) */
970 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
971 memcpy (*d + 6, "II", 2);
973 memcpy (*d + 6, "MM", 2);
976 /* Fixed value (2 bytes, offset 8) */
977 exif_set_short (*d + 8, data->priv->order, 0x002a);
980 * IFD 0 offset (4 bytes, offset 10).
981 * We will start 8 bytes after the
982 * EXIF header (2 bytes for order, another 2 for the test, and
983 * 4 bytes for the IFD 0 offset make 8 bytes together).
985 exif_set_long (*d + 10, data->priv->order, 8);
987 /* Now save IFD 0. IFD 1 will be saved automatically. */
988 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
990 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
992 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
993 "Saved %i byte(s) EXIF data.", *ds);
997 exif_data_new_from_file (const char *path)
1002 loader = exif_loader_new ();
1003 exif_loader_write_file (loader, path);
1004 edata = exif_loader_get_data (loader);
1005 exif_loader_unref (loader);
1011 exif_data_ref (ExifData *data)
1016 data->priv->ref_count++;
1020 exif_data_unref (ExifData *data)
1025 data->priv->ref_count--;
1026 if (!data->priv->ref_count)
1027 exif_data_free (data);
1031 exif_data_free (ExifData *data)
1034 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
1039 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1041 exif_content_unref (data->ifd[i]);
1042 data->ifd[i] = NULL;
1047 exif_mem_free (mem, data->data);
1052 if (data->priv->log) {
1053 exif_log_unref (data->priv->log);
1054 data->priv->log = NULL;
1056 if (data->priv->md) {
1057 exif_mnote_data_unref (data->priv->md);
1058 data->priv->md = NULL;
1060 exif_mem_free (mem, data->priv);
1061 exif_mem_free (mem, data);
1064 exif_mem_unref (mem);
1068 exif_data_dump (ExifData *data)
1075 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1076 if (data->ifd[i] && data->ifd[i]->count) {
1077 printf ("Dumping IFD '%s'...\n",
1078 exif_ifd_get_name (i));
1079 exif_content_dump (data->ifd[i], 0);
1084 printf ("%i byte(s) thumbnail data available.", data->size);
1085 if (data->size >= 4) {
1086 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1087 data->data[0], data->data[1],
1088 data->data[data->size - 2],
1089 data->data[data->size - 1]);
1095 exif_data_get_byte_order (ExifData *data)
1100 return (data->priv->order);
1104 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1112 for (i = 0; i < EXIF_IFD_COUNT; i++)
1113 func (data->ifd[i], user_data);
1116 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1117 struct _ByteOrderChangeData {
1118 ExifByteOrder old, new;
1122 entry_set_byte_order (ExifEntry *e, void *data)
1124 ByteOrderChangeData *d = data;
1129 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1133 content_set_byte_order (ExifContent *content, void *data)
1135 exif_content_foreach_entry (content, entry_set_byte_order, data);
1139 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1141 ByteOrderChangeData d;
1143 if (!data || (order == data->priv->order))
1146 d.old = data->priv->order;
1148 exif_data_foreach_content (data, content_set_byte_order, &d);
1149 data->priv->order = order;
1151 exif_mnote_data_set_byte_order (data->priv->md, order);
1155 exif_data_log (ExifData *data, ExifLog *log)
1159 if (!data || !data->priv)
1161 exif_log_unref (data->priv->log);
1162 data->priv->log = log;
1165 for (i = 0; i < EXIF_IFD_COUNT; i++)
1166 exif_content_log (data->ifd[i], log);
1169 /* Used internally within libexif */
1170 ExifLog *exif_data_get_log (ExifData *);
1172 exif_data_get_log (ExifData *data)
1174 if (!data || !data->priv)
1176 return data->priv->log;
1179 static const struct {
1180 ExifDataOption option;
1182 const char *description;
1183 } exif_data_option[] = {
1184 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1185 N_("Ignore unknown tags when loading EXIF data.")},
1186 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1187 N_("Add, correct and remove entries to get EXIF data that follows "
1188 "the specification.")},
1189 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1190 N_("When loading and resaving Exif data, save the maker note unmodified."
1191 " Be aware that the maker note can get corrupted.")},
1196 exif_data_option_get_name (ExifDataOption o)
1200 for (i = 0; exif_data_option[i].name; i++)
1201 if (exif_data_option[i].option == o)
1203 return _(exif_data_option[i].name);
1207 exif_data_option_get_description (ExifDataOption o)
1211 for (i = 0; exif_data_option[i].description; i++)
1212 if (exif_data_option[i].option == o)
1214 return _(exif_data_option[i].description);
1218 exif_data_set_option (ExifData *d, ExifDataOption o)
1223 d->priv->options |= o;
1227 exif_data_unset_option (ExifData *d, ExifDataOption o)
1232 d->priv->options &= ~o;
1236 fix_func (ExifContent *c, void *UNUSED(data))
1238 switch (exif_content_get_ifd (c)) {
1240 if (c->parent->data)
1241 exif_content_fix (c);
1242 else if (c->count) {
1243 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1244 "No thumbnail but entries on thumbnail. These entries have been "
1247 unsigned int cnt = c->count;
1248 exif_content_remove_entry (c, c->entries[c->count - 1]);
1249 if (cnt == c->count) {
1251 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1252 "failed to remove last entry from entries.");
1259 exif_content_fix (c);
1264 exif_data_fix (ExifData *d)
1266 exif_data_foreach_content (d, fix_func, NULL);
1270 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1275 d->priv->data_type = dt;
1279 exif_data_get_data_type (ExifData *d)
1281 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_UNKNOWN;