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 #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 /* FIXME: should use exif_tag_get_name_in_ifd here but entry->parent
175 * has not been set yet
177 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
178 "Loading entry 0x%x ('%s')...", entry->tag,
179 exif_tag_get_name (entry->tag));
181 /* {0,1,2,4,8} x { 0x00000000 .. 0xffffffff }
182 * -> { 0x000000000 .. 0x7fffffff8 } */
183 s = exif_format_get_size(entry->format) * entry->components;
184 if ((s < entry->components) || (s == 0)){
189 * Size? If bigger than 4 bytes, the actual data is not
190 * in the entry but somewhere else (offset).
193 doff = exif_get_long (d + offset + 8, data->priv->order);
198 if ((doff + s < doff) || (doff + s < s) || (doff + s > size)) {
199 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
200 "Tag data past end of buffer (%u > %u)", doff+s, size);
204 entry->data = exif_data_alloc (data, s);
207 memcpy (entry->data, d + doff, s);
209 /* FIXME: What do our callers do if (entry->data == NULL)? */
210 EXIF_LOG_NO_MEMORY(data->priv->log, "ExifData", s);
213 /* If this is the MakerNote, remember the offset */
214 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
216 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
217 "MakerNote found with empty data");
218 } else if (entry->size > 6) {
219 exif_log (data->priv->log,
220 EXIF_LOG_CODE_DEBUG, "ExifData",
221 "MakerNote found (%02x %02x %02x %02x "
222 "%02x %02x %02x...).",
223 entry->data[0], entry->data[1], entry->data[2],
224 entry->data[3], entry->data[4], entry->data[5],
227 data->priv->offset_mnote = doff;
233 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
234 unsigned char **d, unsigned int *ds,
237 unsigned int doff, s;
240 if (!data || !data->priv)
244 * Each entry is 12 bytes long. The memory for the entry has
245 * already been allocated.
247 exif_set_short (*d + 6 + offset + 0,
248 data->priv->order, (ExifShort) e->tag);
249 exif_set_short (*d + 6 + offset + 2,
250 data->priv->order, (ExifShort) e->format);
252 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
253 /* If this is the maker note tag, update it. */
254 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
255 /* TODO: this is using the wrong ExifMem to free e->data */
256 exif_mem_free (data->priv->mem, e->data);
259 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
260 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
261 e->components = e->size;
265 exif_set_long (*d + 6 + offset + 4,
266 data->priv->order, e->components);
269 * Size? If bigger than 4 bytes, the actual data is not in
270 * the entry but somewhere else.
272 s = exif_format_get_size (e->format) * e->components;
279 * According to the TIFF specification,
280 * the offset must be an even number. If we need to introduce
281 * a padding byte, we set it to 0.
285 t = exif_mem_realloc (data->priv->mem, *d, ts);
287 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
292 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
294 *(*d + *ds - 1) = '\0';
299 /* Write the data. Fill unneeded bytes with 0. Do not crash with
302 memcpy (*d + 6 + doff, e->data, s);
304 memset (*d + 6 + doff, 0, s);
307 memset (*d + 6 + doff + s, 0, (4 - s));
311 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
312 unsigned int ds, ExifLong o, ExifLong s)
315 if ((o + s < o) || (o + s < s) || (o + s > ds) || (o > ds)) {
316 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
317 "Bogus thumbnail offset (%u) or size (%u).",
323 exif_mem_free (data->priv->mem, data->data);
324 if (!(data->data = exif_data_alloc (data, s))) {
325 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", s);
330 memcpy (data->data, d + o, s);
334 #define CHECK_REC(i) \
336 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
337 "ExifData", "Recursive entry in IFD " \
338 "'%s' detected. Skipping...", \
339 exif_ifd_get_name (i)); \
342 if (data->ifd[(i)]->count) { \
343 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
344 "ExifData", "Attempt to load IFD " \
345 "'%s' multiple times detected. " \
347 exif_ifd_get_name (i)); \
351 /*! Load data for an IFD.
353 * \param[in,out] data #ExifData
354 * \param[in] ifd IFD to load
355 * \param[in] d pointer to buffer containing raw IFD data
356 * \param[in] ds size of raw data in buffer at \c d
357 * \param[in] offset offset into buffer at \c d at which IFD starts
358 * \param[in] recursion_depth number of times this function has been
359 * recursively called without returning
362 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
363 const unsigned char *d,
364 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
366 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
372 if (!data || !data->priv)
375 /* check for valid ExifIfd enum range */
376 if ((((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
379 if (recursion_depth > 30) {
380 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
381 "Deep recursion detected!");
385 /* Read the number of entries */
386 if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) {
387 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
388 "Tag data past end of buffer (%u > %u)", offset+2, ds);
391 n = exif_get_short (d + offset, data->priv->order);
392 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
393 "Loading %hu entries...", n);
396 /* Check if we have enough data. */
397 if (offset + 12 * n > ds) {
398 n = (ds - offset) / 12;
399 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
400 "Short data; only loading %hu entries...", n);
403 for (i = 0; i < n; i++) {
405 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
407 case EXIF_TAG_EXIF_IFD_POINTER:
408 case EXIF_TAG_GPS_INFO_IFD_POINTER:
409 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
410 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
411 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
412 o = exif_get_long (d + offset + 12 * i + 8,
414 /* FIXME: IFD_POINTER tags aren't marked as being in a
415 * specific IFD, so exif_tag_get_name_in_ifd won't work
417 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
418 "Sub-IFD entry 0x%x ('%s') at %u.", tag,
419 exif_tag_get_name(tag), o);
421 case EXIF_TAG_EXIF_IFD_POINTER:
422 CHECK_REC (EXIF_IFD_EXIF);
423 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
425 case EXIF_TAG_GPS_INFO_IFD_POINTER:
426 CHECK_REC (EXIF_IFD_GPS);
427 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
429 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
430 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
431 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
433 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
434 thumbnail_offset = o;
435 if (thumbnail_offset && thumbnail_length)
436 exif_data_load_data_thumbnail (data, d,
437 ds, thumbnail_offset,
440 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
441 thumbnail_length = o;
442 if (thumbnail_offset && thumbnail_length)
443 exif_data_load_data_thumbnail (data, d,
444 ds, thumbnail_offset,
454 * If we don't know the tag, don't fail. It could be that new
455 * versions of the standard have defined additional tags. Note that
456 * 0 is a valid tag in the GPS IFD.
458 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
461 * Special case: Tag and format 0. That's against specification
462 * (at least up to 2.2). But Photoshop writes it anyways.
464 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
465 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
466 "Skipping empty entry at position %u in '%s'.", i,
467 exif_ifd_get_name (ifd));
470 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
471 "Unknown tag 0x%04x (entry %u in '%s'). Please report this tag "
472 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
473 exif_ifd_get_name (ifd));
474 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
477 entry = exif_entry_new_mem (data->priv->mem);
478 if (exif_data_load_data_entry (data, entry, d, ds,
480 exif_content_add_entry (data->ifd[ifd], entry);
481 exif_entry_unref (entry);
488 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
490 ExifShort tag1 = exif_get_short (p1, o);
491 ExifShort tag2 = exif_get_short (p2, o);
493 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
497 cmp_func_intel (const void *elem1, const void *elem2)
499 return cmp_func ((const unsigned char *) elem1,
500 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
504 cmp_func_motorola (const void *elem1, const void *elem2)
506 return cmp_func ((const unsigned char *) elem1,
507 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
511 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
512 unsigned char **d, unsigned int *ds,
515 unsigned int j, n_ptr = 0, n_thumb = 0;
520 if (!data || !data->priv || !ifd || !d || !ds)
523 for (i = 0; i < EXIF_IFD_COUNT; i++)
524 if (ifd == data->ifd[i])
526 if (i == EXIF_IFD_COUNT)
530 * Check if we need some extra entries for pointers or the thumbnail.
536 * The pointer to IFD_EXIF is in IFD_0. The pointer to
537 * IFD_INTEROPERABILITY is in IFD_EXIF.
539 if (data->ifd[EXIF_IFD_EXIF]->count ||
540 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
543 /* The pointer to IFD_GPS is in IFD_0. */
544 if (data->ifd[EXIF_IFD_GPS]->count)
553 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
560 * Allocate enough memory for all entries
561 * and the number of entries.
563 ts = *ds + (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
564 t = exif_mem_realloc (data->priv->mem, *d, ts);
566 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
572 /* Save the number of entries */
573 exif_set_short (*d + 6 + offset, data->priv->order,
574 (ExifShort) (ifd->count + n_ptr + n_thumb));
578 * Save each entry. Make sure that no memcpys from NULL pointers are
581 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
582 "Saving %i entries (IFD '%s', offset: %i)...",
583 ifd->count, exif_ifd_get_name (i), offset);
584 for (j = 0; j < ifd->count; j++) {
585 if (ifd->entries[j]) {
586 exif_data_save_data_entry (data, ifd->entries[j], d, ds,
591 offset += 12 * ifd->count;
593 /* Now save special entries. */
598 * The pointer to IFD_EXIF is in IFD_0.
599 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
600 * therefore, if IFD_INTEROPERABILITY is not empty, we need
601 * IFD_EXIF even if latter is empty.
603 if (data->ifd[EXIF_IFD_EXIF]->count ||
604 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
605 exif_set_short (*d + 6 + offset + 0, data->priv->order,
606 EXIF_TAG_EXIF_IFD_POINTER);
607 exif_set_short (*d + 6 + offset + 2, data->priv->order,
609 exif_set_long (*d + 6 + offset + 4, data->priv->order,
611 exif_set_long (*d + 6 + offset + 8, data->priv->order,
613 exif_data_save_data_content (data,
614 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
618 /* The pointer to IFD_GPS is in IFD_0, too. */
619 if (data->ifd[EXIF_IFD_GPS]->count) {
620 exif_set_short (*d + 6 + offset + 0, data->priv->order,
621 EXIF_TAG_GPS_INFO_IFD_POINTER);
622 exif_set_short (*d + 6 + offset + 2, data->priv->order,
624 exif_set_long (*d + 6 + offset + 4, data->priv->order,
626 exif_set_long (*d + 6 + offset + 8, data->priv->order,
628 exif_data_save_data_content (data,
629 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
637 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
640 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
641 exif_set_short (*d + 6 + offset + 0, data->priv->order,
642 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
643 exif_set_short (*d + 6 + offset + 2, data->priv->order,
645 exif_set_long (*d + 6 + offset + 4, data->priv->order,
647 exif_set_long (*d + 6 + offset + 8, data->priv->order,
649 exif_data_save_data_content (data,
650 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
659 * Information about the thumbnail (if any) is saved in
664 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
665 exif_set_short (*d + 6 + offset + 0, data->priv->order,
666 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
667 exif_set_short (*d + 6 + offset + 2, data->priv->order,
669 exif_set_long (*d + 6 + offset + 4, data->priv->order,
671 exif_set_long (*d + 6 + offset + 8, data->priv->order,
673 ts = *ds + data->size;
674 t = exif_mem_realloc (data->priv->mem, *d, ts);
676 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
682 memcpy (*d + *ds - data->size, data->data, data->size);
685 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
686 exif_set_short (*d + 6 + offset + 0, data->priv->order,
687 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
688 exif_set_short (*d + 6 + offset + 2, data->priv->order,
690 exif_set_long (*d + 6 + offset + 4, data->priv->order,
692 exif_set_long (*d + 6 + offset + 8, data->priv->order,
702 /* Sort the directory according to TIFF specification */
703 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
704 (ifd->count + n_ptr + n_thumb), 12,
705 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
707 /* Correctly terminate the directory */
708 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
712 * We are saving IFD 0. Tell where IFD 1 starts and save
715 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
716 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
719 exif_set_long (*d + 6 + offset, data->priv->order, 0);
723 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
724 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
725 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
726 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
727 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
728 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5,
729 EXIF_DATA_TYPE_MAKER_NOTE_FUJI = 6
730 } ExifDataTypeMakerNote;
732 /*! If MakerNote is recognized, load it.
734 * \param[in,out] data #ExifData
735 * \param[in] d pointer to raw EXIF data
736 * \param[in] ds length of data at d
739 interpret_maker_note(ExifData *data, const unsigned char *d, unsigned int ds)
742 ExifEntry* e = exif_data_get_entry (data, EXIF_TAG_MAKER_NOTE);
746 if ((mnoteid = exif_mnote_data_olympus_identify (data, e)) != 0) {
747 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
748 "ExifData", "Olympus MakerNote variant type %d", mnoteid);
749 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
751 } else if ((mnoteid = exif_mnote_data_canon_identify (data, e)) != 0) {
752 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
753 "ExifData", "Canon MakerNote variant type %d", mnoteid);
754 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
756 } else if ((mnoteid = exif_mnote_data_fuji_identify (data, e)) != 0) {
757 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
758 "ExifData", "Fuji MakerNote variant type %d", mnoteid);
759 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
761 /* NOTE: Must do Pentax detection last because some of the
762 * heuristics are pretty general. */
763 } else if ((mnoteid = exif_mnote_data_pentax_identify (data, e)) != 0) {
764 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
765 "ExifData", "Pentax MakerNote variant type %d", mnoteid);
766 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
770 * If we are able to interpret the maker note, do so.
772 if (data->priv->md) {
773 exif_mnote_data_log (data->priv->md, data->priv->log);
774 exif_mnote_data_set_byte_order (data->priv->md,
776 exif_mnote_data_set_offset (data->priv->md,
777 data->priv->offset_mnote);
778 exif_mnote_data_load (data->priv->md, d, ds);
782 #define LOG_TOO_SMALL \
783 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
784 _("Size of data too small to allow for EXIF data."));
787 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
788 unsigned int ds_orig)
793 const unsigned char *d = d_orig;
794 unsigned int ds = ds_orig, len;
796 if (!data || !data->priv || !d || !ds)
799 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
800 "Parsing %i byte(s) EXIF data...\n", ds);
803 * It can be that the data starts with the EXIF header. If it does
804 * not, search the EXIF marker.
810 if (!memcmp (d, ExifHeader, 6)) {
811 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
812 "Found EXIF header.");
815 while ((d[0] == 0xff) && ds) {
820 /* JPEG_MARKER_SOI */
821 if (d[0] == JPEG_MARKER_SOI) {
827 /* JPEG_MARKER_APP0 */
828 if (d[0] == JPEG_MARKER_APP0) {
831 l = (d[0] << 8) | d[1];
839 /* JPEG_MARKER_APP1 */
840 if (d[0] == JPEG_MARKER_APP1)
843 /* Unknown marker or data. Give up. */
844 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
845 "ExifData", _("EXIF marker not found."));
854 len = (d[0] << 8) | d[1];
855 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
856 "We have to deal with %i byte(s) of EXIF data.",
863 * Verify the exif header
864 * (offset 2, length 6).
870 if (memcmp (d, ExifHeader, 6)) {
871 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
872 "ExifData", _("EXIF header not found."));
876 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
877 "Found EXIF header.");
879 /* Byte order (offset 6, length 2) */
882 if (!memcmp (d + 6, "II", 2))
883 data->priv->order = EXIF_BYTE_ORDER_INTEL;
884 else if (!memcmp (d + 6, "MM", 2))
885 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
887 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
888 "ExifData", _("Unknown encoding."));
893 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
897 offset = exif_get_long (d + 10, data->priv->order);
898 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
899 "IFD 0 at %i.", (int) offset);
901 /* Parse the actual exif data (usually offset 14 from start) */
902 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
905 if (offset + 6 + 2 > ds) {
908 n = exif_get_short (d + 6 + offset, data->priv->order);
909 if (offset + 6 + 2 + 12 * n + 4 > ds) {
912 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
914 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
915 "IFD 1 at %i.", (int) offset);
918 if (offset > ds - 6) {
919 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
920 "ExifData", "Bogus offset of IFD1.");
922 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
927 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
928 * cameras use pointers in the maker note tag that point to the
929 * space between IFDs. Here is the only place where we have access
932 interpret_maker_note(data, d, ds);
934 /* Fixup tags if requested */
935 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
936 exif_data_fix (data);
940 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
943 *ds = 0; /* This means something went wrong */
945 if (!data || !d || !ds)
950 *d = exif_data_alloc (data, *ds);
955 memcpy (*d, ExifHeader, 6);
957 /* Order (offset 6) */
958 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
959 memcpy (*d + 6, "II", 2);
961 memcpy (*d + 6, "MM", 2);
964 /* Fixed value (2 bytes, offset 8) */
965 exif_set_short (*d + 8, data->priv->order, 0x002a);
968 * IFD 0 offset (4 bytes, offset 10).
969 * We will start 8 bytes after the
970 * EXIF header (2 bytes for order, another 2 for the test, and
971 * 4 bytes for the IFD 0 offset make 8 bytes together).
973 exif_set_long (*d + 10, data->priv->order, 8);
975 /* Now save IFD 0. IFD 1 will be saved automatically. */
976 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
978 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
980 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
981 "Saved %i byte(s) EXIF data.", *ds);
985 exif_data_new_from_file (const char *path)
990 loader = exif_loader_new ();
991 exif_loader_write_file (loader, path);
992 edata = exif_loader_get_data (loader);
993 exif_loader_unref (loader);
999 exif_data_ref (ExifData *data)
1004 data->priv->ref_count++;
1008 exif_data_unref (ExifData *data)
1013 data->priv->ref_count--;
1014 if (!data->priv->ref_count)
1015 exif_data_free (data);
1019 exif_data_free (ExifData *data)
1022 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
1027 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1029 exif_content_unref (data->ifd[i]);
1030 data->ifd[i] = NULL;
1035 exif_mem_free (mem, data->data);
1040 if (data->priv->log) {
1041 exif_log_unref (data->priv->log);
1042 data->priv->log = NULL;
1044 if (data->priv->md) {
1045 exif_mnote_data_unref (data->priv->md);
1046 data->priv->md = NULL;
1048 exif_mem_free (mem, data->priv);
1049 exif_mem_free (mem, data);
1052 exif_mem_unref (mem);
1056 exif_data_dump (ExifData *data)
1063 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1064 if (data->ifd[i] && data->ifd[i]->count) {
1065 printf ("Dumping IFD '%s'...\n",
1066 exif_ifd_get_name (i));
1067 exif_content_dump (data->ifd[i], 0);
1072 printf ("%i byte(s) thumbnail data available.", data->size);
1073 if (data->size >= 4) {
1074 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1075 data->data[0], data->data[1],
1076 data->data[data->size - 2],
1077 data->data[data->size - 1]);
1083 exif_data_get_byte_order (ExifData *data)
1088 return (data->priv->order);
1092 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1100 for (i = 0; i < EXIF_IFD_COUNT; i++)
1101 func (data->ifd[i], user_data);
1104 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1105 struct _ByteOrderChangeData {
1106 ExifByteOrder old, new;
1110 entry_set_byte_order (ExifEntry *e, void *data)
1112 ByteOrderChangeData *d = data;
1117 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1121 content_set_byte_order (ExifContent *content, void *data)
1123 exif_content_foreach_entry (content, entry_set_byte_order, data);
1127 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1129 ByteOrderChangeData d;
1131 if (!data || (order == data->priv->order))
1134 d.old = data->priv->order;
1136 exif_data_foreach_content (data, content_set_byte_order, &d);
1137 data->priv->order = order;
1139 exif_mnote_data_set_byte_order (data->priv->md, order);
1143 exif_data_log (ExifData *data, ExifLog *log)
1147 if (!data || !data->priv)
1149 exif_log_unref (data->priv->log);
1150 data->priv->log = log;
1153 for (i = 0; i < EXIF_IFD_COUNT; i++)
1154 exif_content_log (data->ifd[i], log);
1157 /* Used internally within libexif */
1158 ExifLog *exif_data_get_log (ExifData *);
1160 exif_data_get_log (ExifData *data)
1162 if (!data || !data->priv)
1164 return data->priv->log;
1167 static const struct {
1168 ExifDataOption option;
1170 const char *description;
1171 } exif_data_option[] = {
1172 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1173 N_("Ignore unknown tags when loading EXIF data.")},
1174 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1175 N_("Add, correct and remove entries to get EXIF data that follows "
1176 "the specification.")},
1177 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1178 N_("When loading and resaving Exif data, save the maker note unmodified."
1179 " Be aware that the maker note can get corrupted.")},
1184 exif_data_option_get_name (ExifDataOption o)
1188 for (i = 0; exif_data_option[i].name; i++)
1189 if (exif_data_option[i].option == o)
1191 return _(exif_data_option[i].name);
1195 exif_data_option_get_description (ExifDataOption o)
1199 for (i = 0; exif_data_option[i].description; i++)
1200 if (exif_data_option[i].option == o)
1202 return _(exif_data_option[i].description);
1206 exif_data_set_option (ExifData *d, ExifDataOption o)
1211 d->priv->options |= o;
1215 exif_data_unset_option (ExifData *d, ExifDataOption o)
1220 d->priv->options &= ~o;
1224 fix_func (ExifContent *c, void *UNUSED(data))
1226 switch (exif_content_get_ifd (c)) {
1228 if (c->parent->data)
1229 exif_content_fix (c);
1230 else if (c->count) {
1231 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1232 "No thumbnail but entries on thumbnail. These entries have been "
1235 unsigned int cnt = c->count;
1236 exif_content_remove_entry (c, c->entries[c->count - 1]);
1237 if (cnt == c->count) {
1239 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1240 "failed to remove last entry from entries.");
1247 exif_content_fix (c);
1252 exif_data_fix (ExifData *d)
1254 exif_data_foreach_content (d, fix_func, NULL);
1258 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1263 d->priv->data_type = dt;
1267 exif_data_get_data_type (ExifData *d)
1269 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_UNKNOWN;