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 /* 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;
241 if (!data || !data->priv)
245 * Each entry is 12 bytes long. The memory for the entry has
246 * already been allocated.
248 exif_set_short (*d + 6 + offset + 0,
249 data->priv->order, (ExifShort) e->tag);
250 exif_set_short (*d + 6 + offset + 2,
251 data->priv->order, (ExifShort) e->format);
253 if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
254 /* If this is the maker note tag, update it. */
255 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
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;
278 * According to the TIFF specification,
279 * the offset must be an even number. If we need to introduce
280 * a padding byte, we set it to 0.
284 t = exif_mem_realloc (data->priv->mem, *d, ts);
286 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
291 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
293 *(*d + *ds - 1) = '\0';
298 /* Write the data. Fill unneeded bytes with 0. Do not crash with
301 memcpy (*d + 6 + doff, e->data, s);
303 memset (*d + 6 + doff, 0, s);
306 memset (*d + 6 + doff + s, 0, (4 - s));
310 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
311 unsigned int ds, ExifLong o, ExifLong s)
314 if ((o + s < o) || (o + s < s) || (o + s > ds) || (o > ds)) {
315 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
316 "Bogus thumbnail offset (%u) or size (%u).",
322 exif_mem_free (data->priv->mem, data->data);
323 if (!(data->data = exif_data_alloc (data, s))) {
324 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", s);
329 memcpy (data->data, d + o, s);
333 #define CHECK_REC(i) \
335 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
336 "ExifData", "Recursive entry in IFD " \
337 "'%s' detected. Skipping...", \
338 exif_ifd_get_name (i)); \
341 if (data->ifd[(i)]->count) { \
342 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
343 "ExifData", "Attempt to load IFD " \
344 "'%s' multiple times detected. " \
346 exif_ifd_get_name (i)); \
350 /*! Load data for an IFD.
352 * \param[in,out] data #ExifData
353 * \param[in] ifd IFD to load
354 * \param[in] d pointer to buffer containing raw IFD data
355 * \param[in] ds size of raw data in buffer at \c d
356 * \param[in] offset offset into buffer at \c d at which IFD starts
357 * \param[in] recursion_depth number of times this function has been
358 * recursively called without returning
361 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
362 const unsigned char *d,
363 unsigned int ds, unsigned int offset, unsigned int recursion_depth)
365 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
371 if (!data || !data->priv)
374 /* check for valid ExifIfd enum range */
375 if ((((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
378 if (recursion_depth > 30) {
379 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
380 "Deep recursion detected!");
384 /* Read the number of entries */
385 if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) {
386 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
387 "Tag data past end of buffer (%u > %u)", offset+2, ds);
390 n = exif_get_short (d + offset, data->priv->order);
391 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
392 "Loading %hu entries...", n);
395 /* Check if we have enough data. */
396 if (offset + 12 * n > ds) {
397 n = (ds - offset) / 12;
398 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
399 "Short data; only loading %hu entries...", n);
402 for (i = 0; i < n; i++) {
404 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
406 case EXIF_TAG_EXIF_IFD_POINTER:
407 case EXIF_TAG_GPS_INFO_IFD_POINTER:
408 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
409 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
410 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
411 o = exif_get_long (d + offset + 12 * i + 8,
413 /* FIXME: IFD_POINTER tags aren't marked as being in a
414 * specific IFD, so exif_tag_get_name_in_ifd won't work
416 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
417 "IFD entry 0x%x at %u.", tag, o);
419 case EXIF_TAG_EXIF_IFD_POINTER:
420 CHECK_REC (EXIF_IFD_EXIF);
421 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
423 case EXIF_TAG_GPS_INFO_IFD_POINTER:
424 CHECK_REC (EXIF_IFD_GPS);
425 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
427 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
428 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
429 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
431 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
432 thumbnail_offset = o;
433 if (thumbnail_offset && thumbnail_length)
434 exif_data_load_data_thumbnail (data, d,
435 ds, thumbnail_offset,
438 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
439 thumbnail_length = o;
440 if (thumbnail_offset && thumbnail_length)
441 exif_data_load_data_thumbnail (data, d,
442 ds, thumbnail_offset,
452 * If we don't know the tag, don't fail. It could be that new
453 * versions of the standard have defined additional tags. Note that
454 * 0 is a valid tag in the GPS IFD.
456 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
459 * Special case: Tag and format 0. That's against specification
460 * (at least up to 2.2). But Photoshop writes it anyways.
462 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
463 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
464 "Skipping empty entry at position %u in '%s'.", i,
465 exif_ifd_get_name (ifd));
468 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
469 "Unknown tag 0x%04x (entry %u in '%s'). Please report this tag "
470 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
471 exif_ifd_get_name (ifd));
472 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
475 entry = exif_entry_new_mem (data->priv->mem);
476 if (exif_data_load_data_entry (data, entry, d, ds,
478 exif_content_add_entry (data->ifd[ifd], entry);
479 exif_entry_unref (entry);
486 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
488 ExifShort tag1 = exif_get_short (p1, o);
489 ExifShort tag2 = exif_get_short (p2, o);
491 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
495 cmp_func_intel (const void *elem1, const void *elem2)
497 return cmp_func ((const unsigned char *) elem1,
498 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
502 cmp_func_motorola (const void *elem1, const void *elem2)
504 return cmp_func ((const unsigned char *) elem1,
505 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
509 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
510 unsigned char **d, unsigned int *ds,
513 unsigned int j, n_ptr = 0, n_thumb = 0;
518 if (!data || !data->priv || !ifd || !d || !ds)
521 for (i = 0; i < EXIF_IFD_COUNT; i++)
522 if (ifd == data->ifd[i])
524 if (i == EXIF_IFD_COUNT)
528 * Check if we need some extra entries for pointers or the thumbnail.
534 * The pointer to IFD_EXIF is in IFD_0. The pointer to
535 * IFD_INTEROPERABILITY is in IFD_EXIF.
537 if (data->ifd[EXIF_IFD_EXIF]->count ||
538 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
541 /* The pointer to IFD_GPS is in IFD_0. */
542 if (data->ifd[EXIF_IFD_GPS]->count)
551 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
558 * Allocate enough memory for all entries
559 * and the number of entries.
561 ts = *ds + (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
562 t = exif_mem_realloc (data->priv->mem, *d, ts);
564 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
570 /* Save the number of entries */
571 exif_set_short (*d + 6 + offset, data->priv->order,
572 (ExifShort) (ifd->count + n_ptr + n_thumb));
576 * Save each entry. Make sure that no memcpys from NULL pointers are
579 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
580 "Saving %i entries (IFD '%s', offset: %i)...",
581 ifd->count, exif_ifd_get_name (i), offset);
582 for (j = 0; j < ifd->count; j++) {
583 if (ifd->entries[j]) {
584 exif_data_save_data_entry (data, ifd->entries[j], d, ds,
589 offset += 12 * ifd->count;
591 /* Now save special entries. */
596 * The pointer to IFD_EXIF is in IFD_0.
597 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
598 * therefore, if IFD_INTEROPERABILITY is not empty, we need
599 * IFD_EXIF even if latter is empty.
601 if (data->ifd[EXIF_IFD_EXIF]->count ||
602 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
603 exif_set_short (*d + 6 + offset + 0, data->priv->order,
604 EXIF_TAG_EXIF_IFD_POINTER);
605 exif_set_short (*d + 6 + offset + 2, data->priv->order,
607 exif_set_long (*d + 6 + offset + 4, data->priv->order,
609 exif_set_long (*d + 6 + offset + 8, data->priv->order,
611 exif_data_save_data_content (data,
612 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
616 /* The pointer to IFD_GPS is in IFD_0, too. */
617 if (data->ifd[EXIF_IFD_GPS]->count) {
618 exif_set_short (*d + 6 + offset + 0, data->priv->order,
619 EXIF_TAG_GPS_INFO_IFD_POINTER);
620 exif_set_short (*d + 6 + offset + 2, data->priv->order,
622 exif_set_long (*d + 6 + offset + 4, data->priv->order,
624 exif_set_long (*d + 6 + offset + 8, data->priv->order,
626 exif_data_save_data_content (data,
627 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
635 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
638 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
639 exif_set_short (*d + 6 + offset + 0, data->priv->order,
640 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
641 exif_set_short (*d + 6 + offset + 2, data->priv->order,
643 exif_set_long (*d + 6 + offset + 4, data->priv->order,
645 exif_set_long (*d + 6 + offset + 8, data->priv->order,
647 exif_data_save_data_content (data,
648 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
657 * Information about the thumbnail (if any) is saved in
662 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
663 exif_set_short (*d + 6 + offset + 0, data->priv->order,
664 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
665 exif_set_short (*d + 6 + offset + 2, data->priv->order,
667 exif_set_long (*d + 6 + offset + 4, data->priv->order,
669 exif_set_long (*d + 6 + offset + 8, data->priv->order,
671 ts = *ds + data->size;
672 t = exif_mem_realloc (data->priv->mem, *d, ts);
674 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
680 memcpy (*d + *ds - data->size, data->data, data->size);
683 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
684 exif_set_short (*d + 6 + offset + 0, data->priv->order,
685 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
686 exif_set_short (*d + 6 + offset + 2, data->priv->order,
688 exif_set_long (*d + 6 + offset + 4, data->priv->order,
690 exif_set_long (*d + 6 + offset + 8, data->priv->order,
700 /* Sort the directory according to TIFF specification */
701 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
702 (ifd->count + n_ptr + n_thumb), 12,
703 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
705 /* Correctly terminate the directory */
706 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
710 * We are saving IFD 0. Tell where IFD 1 starts and save
713 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
714 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
717 exif_set_long (*d + 6 + offset, data->priv->order, 0);
721 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
722 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
723 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
724 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3,
725 EXIF_DATA_TYPE_MAKER_NOTE_NIKON = 4,
726 EXIF_DATA_TYPE_MAKER_NOTE_CASIO = 5,
727 EXIF_DATA_TYPE_MAKER_NOTE_FUJI = 6
728 } ExifDataTypeMakerNote;
730 static ExifDataTypeMakerNote
731 exif_data_get_type_maker_note (ExifData *d)
737 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
739 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
741 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
743 /* Olympus & Nikon & Sanyo */
744 if ((e->size >= 8) && ( !memcmp (e->data, "OLYMP", 6) ||
745 !memcmp (e->data, "OLYMPUS", 8) ||
746 !memcmp (e->data, "SANYO", 6) ||
747 !memcmp (e->data, "EPSON", 6) ||
748 !memcmp (e->data, "Nikon", 6)))
749 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
751 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
753 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
756 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
757 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
759 /* Pentax & some variant of Nikon */
760 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
762 exif_entry_get_value (em, value, sizeof(value)),
764 return EXIF_DATA_TYPE_MAKER_NOTE_NIKON;
766 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
768 if ((e->size >= 8) && !memcmp (e->data, "AOC", 4)) {
769 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
771 if ((e->size >= 8) && !memcmp (e->data, "QVC", 4)) {
772 return EXIF_DATA_TYPE_MAKER_NOTE_CASIO;
774 if ((e->size >= 12) && !memcmp (e->data, "FUJIFILM", 8)) {
775 return EXIF_DATA_TYPE_MAKER_NOTE_FUJI;
778 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
781 #define LOG_TOO_SMALL \
782 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
783 _("Size of data too small to allow for EXIF data."));
786 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
787 unsigned int ds_orig)
792 const unsigned char *d = d_orig;
793 unsigned int ds = ds_orig, len;
795 if (!data || !data->priv || !d || !ds)
798 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
799 "Parsing %i byte(s) EXIF data...\n", ds);
802 * It can be that the data starts with the EXIF header. If it does
803 * not, search the EXIF marker.
809 if (!memcmp (d, ExifHeader, 6)) {
810 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
811 "Found EXIF header.");
814 while ((d[0] == 0xff) && ds) {
819 /* JPEG_MARKER_SOI */
820 if (d[0] == JPEG_MARKER_SOI) {
826 /* JPEG_MARKER_APP0 */
827 if (d[0] == JPEG_MARKER_APP0) {
830 l = (d[0] << 8) | d[1];
838 /* JPEG_MARKER_APP1 */
839 if (d[0] == JPEG_MARKER_APP1)
842 /* Unknown marker or data. Give up. */
843 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
844 "ExifData", _("EXIF marker not found."));
853 len = (d[0] << 8) | d[1];
854 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
855 "We have to deal with %i byte(s) of EXIF data.",
862 * Verify the exif header
863 * (offset 2, length 6).
869 if (memcmp (d, ExifHeader, 6)) {
870 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
871 "ExifData", _("EXIF header not found."));
875 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
876 "Found EXIF header.");
878 /* Byte order (offset 6, length 2) */
881 if (!memcmp (d + 6, "II", 2))
882 data->priv->order = EXIF_BYTE_ORDER_INTEL;
883 else if (!memcmp (d + 6, "MM", 2))
884 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
886 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
887 "ExifData", _("Unknown encoding."));
892 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
896 offset = exif_get_long (d + 10, data->priv->order);
897 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
898 "IFD 0 at %i.", (int) offset);
900 /* Parse the actual exif data (usually offset 14 from start) */
901 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
904 if (offset + 6 + 2 > ds) {
907 n = exif_get_short (d + 6 + offset, data->priv->order);
908 if (offset + 6 + 2 + 12 * n + 4 > ds) {
911 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
913 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
914 "IFD 1 at %i.", (int) offset);
917 if (offset > ds - 6) {
918 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
919 "ExifData", "Bogus offset of IFD1.");
921 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
926 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
927 * cameras use pointers in the maker note tag that point to the
928 * space between IFDs. Here is the only place where we have access
931 switch (exif_data_get_type_maker_note (data)) {
932 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
933 case EXIF_DATA_TYPE_MAKER_NOTE_NIKON:
934 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
936 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
937 case EXIF_DATA_TYPE_MAKER_NOTE_CASIO:
938 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
940 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
941 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
943 case EXIF_DATA_TYPE_MAKER_NOTE_FUJI:
944 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
951 * If we are able to interpret the maker note, do so.
953 if (data->priv->md) {
954 exif_mnote_data_log (data->priv->md, data->priv->log);
955 exif_mnote_data_set_byte_order (data->priv->md,
957 exif_mnote_data_set_offset (data->priv->md,
958 data->priv->offset_mnote);
959 exif_mnote_data_load (data->priv->md, d, ds);
962 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
963 exif_data_fix (data);
967 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
970 *ds = 0; /* This means something went wrong */
972 if (!data || !d || !ds)
977 *d = exif_data_alloc (data, *ds);
982 memcpy (*d, ExifHeader, 6);
984 /* Order (offset 6) */
985 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
986 memcpy (*d + 6, "II", 2);
988 memcpy (*d + 6, "MM", 2);
991 /* Fixed value (2 bytes, offset 8) */
992 exif_set_short (*d + 8, data->priv->order, 0x002a);
995 * IFD 0 offset (4 bytes, offset 10).
996 * We will start 8 bytes after the
997 * EXIF header (2 bytes for order, another 2 for the test, and
998 * 4 bytes for the IFD 0 offset make 8 bytes together).
1000 exif_set_long (*d + 10, data->priv->order, 8);
1002 /* Now save IFD 0. IFD 1 will be saved automatically. */
1003 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
1005 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
1007 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
1008 "Saved %i byte(s) EXIF data.", *ds);
1012 exif_data_new_from_file (const char *path)
1017 loader = exif_loader_new ();
1018 exif_loader_write_file (loader, path);
1019 edata = exif_loader_get_data (loader);
1020 exif_loader_unref (loader);
1026 exif_data_ref (ExifData *data)
1031 data->priv->ref_count++;
1035 exif_data_unref (ExifData *data)
1040 data->priv->ref_count--;
1041 if (!data->priv->ref_count)
1042 exif_data_free (data);
1046 exif_data_free (ExifData *data)
1049 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
1054 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1056 exif_content_unref (data->ifd[i]);
1057 data->ifd[i] = NULL;
1062 exif_mem_free (mem, data->data);
1067 if (data->priv->log) {
1068 exif_log_unref (data->priv->log);
1069 data->priv->log = NULL;
1071 if (data->priv->md) {
1072 exif_mnote_data_unref (data->priv->md);
1073 data->priv->md = NULL;
1075 exif_mem_free (mem, data->priv);
1076 exif_mem_free (mem, data);
1079 exif_mem_unref (mem);
1083 exif_data_dump (ExifData *data)
1090 for (i = 0; i < EXIF_IFD_COUNT; i++) {
1091 if (data->ifd[i] && data->ifd[i]->count) {
1092 printf ("Dumping IFD '%s'...\n",
1093 exif_ifd_get_name (i));
1094 exif_content_dump (data->ifd[i], 0);
1099 printf ("%i byte(s) thumbnail data available.", data->size);
1100 if (data->size >= 4) {
1101 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
1102 data->data[0], data->data[1],
1103 data->data[data->size - 2],
1104 data->data[data->size - 1]);
1110 exif_data_get_byte_order (ExifData *data)
1115 return (data->priv->order);
1119 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
1127 for (i = 0; i < EXIF_IFD_COUNT; i++)
1128 func (data->ifd[i], user_data);
1131 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1132 struct _ByteOrderChangeData {
1133 ExifByteOrder old, new;
1137 entry_set_byte_order (ExifEntry *e, void *data)
1139 ByteOrderChangeData *d = data;
1144 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1148 content_set_byte_order (ExifContent *content, void *data)
1150 exif_content_foreach_entry (content, entry_set_byte_order, data);
1154 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1156 ByteOrderChangeData d;
1158 if (!data || (order == data->priv->order))
1161 d.old = data->priv->order;
1163 exif_data_foreach_content (data, content_set_byte_order, &d);
1164 data->priv->order = order;
1166 exif_mnote_data_set_byte_order (data->priv->md, order);
1170 exif_data_log (ExifData *data, ExifLog *log)
1174 if (!data || !data->priv)
1176 exif_log_unref (data->priv->log);
1177 data->priv->log = log;
1180 for (i = 0; i < EXIF_IFD_COUNT; i++)
1181 exif_content_log (data->ifd[i], log);
1184 /* Used internally within libexif */
1185 ExifLog *exif_data_get_log (ExifData *);
1187 exif_data_get_log (ExifData *data)
1189 if (!data || !data->priv)
1191 return data->priv->log;
1194 static const struct {
1195 ExifDataOption option;
1197 const char *description;
1198 } exif_data_option[] = {
1199 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1200 N_("Ignore unknown tags when loading EXIF data.")},
1201 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1202 N_("Add, correct and remove entries to get EXIF data that follows "
1203 "the specification.")},
1204 {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
1205 N_("When loading and resaving Exif data, save the maker note unmodified."
1206 " Be aware that the maker note can get corrupted.")},
1211 exif_data_option_get_name (ExifDataOption o)
1215 for (i = 0; exif_data_option[i].name; i++)
1216 if (exif_data_option[i].option == o)
1218 return _(exif_data_option[i].name);
1222 exif_data_option_get_description (ExifDataOption o)
1226 for (i = 0; exif_data_option[i].description; i++)
1227 if (exif_data_option[i].option == o)
1229 return _(exif_data_option[i].description);
1233 exif_data_set_option (ExifData *d, ExifDataOption o)
1238 d->priv->options |= o;
1242 exif_data_unset_option (ExifData *d, ExifDataOption o)
1247 d->priv->options &= ~o;
1251 fix_func (ExifContent *c, void *UNUSED(data))
1253 switch (exif_content_get_ifd (c)) {
1255 if (c->parent->data)
1256 exif_content_fix (c);
1258 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1259 "No thumbnail but entries on thumbnail. These entries have been "
1262 unsigned int cnt = c->count;
1263 exif_content_remove_entry (c, c->entries[c->count - 1]);
1264 if (cnt == c->count) {
1266 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1267 "failed to remove last entry from entries.");
1274 exif_content_fix (c);
1279 exif_data_fix (ExifData *d)
1281 exif_data_foreach_content (d, fix_func, NULL);
1285 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1290 d->priv->data_type = dt;
1294 exif_data_get_data_type (ExifData *d)
1296 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_UNKNOWN;