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>
32 #include <libexif/olympus/exif-mnote-data-olympus.h>
33 #include <libexif/canon/exif-mnote-data-canon.h>
34 #include <libexif/pentax/exif-mnote-data-pentax.h>
41 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
43 #if defined(__WATCOMC__) || defined(_MSC_VER)
44 # define strncasecmp strnicmp
47 #undef JPEG_MARKER_SOI
48 #define JPEG_MARKER_SOI 0xd8
49 #undef JPEG_MARKER_APP0
50 #define JPEG_MARKER_APP0 0xe0
51 #undef JPEG_MARKER_APP1
52 #define JPEG_MARKER_APP1 0xe1
54 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
56 struct _ExifDataPrivate
65 unsigned int ref_count;
67 /* Temporarily used while loading data */
68 unsigned int offset_mnote;
70 ExifDataOption options;
71 ExifDataType data_type;
75 exif_data_alloc (ExifData *data, unsigned int i)
79 if (!data || !i) return NULL;
81 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)
111 if (!mem) return NULL;
113 data = exif_mem_alloc (mem, sizeof (ExifData));
114 if (!data) return (NULL);
115 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
116 if (!data->priv) { exif_mem_free (mem, data); return (NULL); }
117 data->priv->ref_count = 1;
119 data->priv->mem = mem;
122 for (i = 0; i < EXIF_IFD_COUNT; i++) {
123 data->ifd[i] = exif_content_new_mem (data->priv->mem);
125 exif_data_free (data);
128 data->ifd[i]->parent = data;
131 /* Default options */
132 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
133 exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
135 /* Default data type: none */
136 exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
142 exif_data_new_from_data (const unsigned char *data, unsigned int size)
146 edata = exif_data_new ();
147 exif_data_load_data (edata, data, size);
152 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
153 const unsigned char *d,
154 unsigned int size, unsigned int offset)
156 unsigned int s, doff;
158 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
159 entry->format = exif_get_short (d + offset + 2, data->priv->order);
160 entry->components = exif_get_long (d + offset + 4, data->priv->order);
162 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
163 "Loading entry 0x%x ('%s')...", entry->tag,
164 exif_tag_get_name (entry->tag));
167 * Size? If bigger than 4 bytes, the actual data is not
168 * in the entry but somewhere else (offset).
170 s = exif_format_get_size (entry->format) * entry->components;
174 doff = exif_get_long (d + offset + 8, data->priv->order);
182 entry->data = exif_data_alloc (data, s);
185 memcpy (entry->data, d + doff, s);
188 /* If this is the MakerNote, remember the offset */
189 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
190 if (entry->size > 6) exif_log (data->priv->log,
191 EXIF_LOG_CODE_DEBUG, "ExifData",
192 "MakerNote found (%02x %02x %02x %02x "
193 "%02x %02x %02x...).",
194 entry->data[0], entry->data[1], entry->data[2],
195 entry->data[3], entry->data[4], entry->data[5],
197 data->priv->offset_mnote = doff;
202 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
203 unsigned char **d, unsigned int *ds,
206 unsigned int doff, s;
208 if (!data || !data->priv) return;
211 * Each entry is 12 bytes long. The memory for the entry has
212 * already been allocated.
214 exif_set_short (*d + 6 + offset + 0,
215 data->priv->order, (ExifShort) e->tag);
216 exif_set_short (*d + 6 + offset + 2,
217 data->priv->order, (ExifShort) e->format);
219 #ifndef EXIF_DONT_CHANGE_MAKER_NOTE
220 /* If this is the maker note tag, update it. */
221 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
222 exif_mem_free (data->priv->mem, e->data);
225 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
226 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
227 e->components = e->size;
231 exif_set_long (*d + 6 + offset + 4,
232 data->priv->order, e->components);
235 * Size? If bigger than 4 bytes, the actual data is not in
236 * the entry but somewhere else.
238 s = exif_format_get_size (e->format) * e->components;
244 * According to the TIFF specification,
245 * the offset must be an even number. If we need to introduce
246 * a padding byte, we set it to 0.
249 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
251 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
254 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
255 if (s & 1) *(*d + *ds - 1) = '\0';
260 /* Write the data. Fill unneeded bytes with 0. */
261 memcpy (*d + 6 + doff, e->data, s);
262 if (s < 4) memset (*d + 6 + doff + s, 0, (4 - s));
266 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
267 unsigned int ds, ExifLong offset, ExifLong size)
269 if (ds < offset + size) {
270 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
271 "Bogus thumbnail offset and size: %i < %i + %i.",
272 (int) ds, (int) offset, (int) size);
275 if (data->data) exif_mem_free (data->priv->mem, data->data);
277 data->data = exif_data_alloc (data, data->size);
278 if (!data->data) return;
279 memcpy (data->data, d + offset, data->size);
283 #define CHECK_REC(i) \
285 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
286 "ExifData", "Recursive entry in IFD " \
287 "'%s' detected. Skipping...", \
288 exif_ifd_get_name (i)); \
291 if (data->ifd[(i)]->count) { \
292 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
293 "ExifData", "Attemt to load IFD " \
294 "'%s' multiple times detected. " \
296 exif_ifd_get_name (i)); \
301 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
302 const unsigned char *d,
303 unsigned int ds, unsigned int offset)
305 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
311 if (!data || !data->priv) return;
312 if ((ifd < 0) || (ifd >= EXIF_IFD_COUNT)) return;
314 /* Read the number of entries */
315 if (offset >= ds - 1) return;
316 n = exif_get_short (d + offset, data->priv->order);
317 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
318 "Loading %i entries...", n);
321 /* Check if we have enough data. */
322 if (offset + 12 * n > ds) n = (ds - offset) / 12;
324 for (i = 0; i < n; i++) {
326 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
328 case EXIF_TAG_EXIF_IFD_POINTER:
329 case EXIF_TAG_GPS_INFO_IFD_POINTER:
330 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
331 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
332 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
333 o = exif_get_long (d + offset + 12 * i + 8,
336 case EXIF_TAG_EXIF_IFD_POINTER:
337 CHECK_REC (EXIF_IFD_EXIF);
338 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o);
340 case EXIF_TAG_GPS_INFO_IFD_POINTER:
341 CHECK_REC (EXIF_IFD_GPS);
342 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o);
344 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
345 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
346 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o);
348 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
349 thumbnail_offset = o;
350 if (thumbnail_offset && thumbnail_length)
351 exif_data_load_data_thumbnail (data, d,
352 ds, thumbnail_offset,
355 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
356 thumbnail_length = o;
357 if (thumbnail_offset && thumbnail_length)
358 exif_data_load_data_thumbnail (data, d,
359 ds, thumbnail_offset,
369 * If we don't know the tag, don't fail. It could be that new
370 * versions of the standard have defined additional tags. Note that
371 * 0 is a valid tag in the GPS IFD.
373 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
376 * Special case: Tag and format 0. That's against specification.
377 * At least up to 2.2. But Photoshop writes it anyways.
379 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
380 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
381 "Skipping empty entry at position %i in '%s'.", i,
382 exif_ifd_get_name (ifd));
385 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
386 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
387 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
388 exif_ifd_get_name (ifd));
389 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
392 entry = exif_entry_new_mem (data->priv->mem);
393 exif_data_load_data_entry (data, entry, d, ds,
395 exif_content_add_entry (data->ifd[ifd], entry);
396 exif_entry_unref (entry);
403 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
405 ExifShort tag1 = exif_get_short (p1, o);
406 ExifShort tag2 = exif_get_short (p2, o);
408 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
412 cmp_func_intel (const void *elem1, const void *elem2)
414 return cmp_func ((const unsigned char *) elem1,
415 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
419 cmp_func_motorola (const void *elem1, const void *elem2)
421 return cmp_func ((const unsigned char *) elem1,
422 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
426 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
427 unsigned char **d, unsigned int *ds,
430 unsigned int j, n_ptr = 0, n_thumb = 0;
433 if (!data || !data->priv || !ifd || !d || !ds) return;
435 for (i = 0; i < EXIF_IFD_COUNT; i++)
436 if (ifd == data->ifd[i])
438 if (i == EXIF_IFD_COUNT)
442 * Check if we need some extra entries for pointers or the thumbnail.
448 * The pointer to IFD_EXIF is in IFD_0. The pointer to
449 * IFD_INTEROPERABILITY is in IFD_EXIF.
451 if (data->ifd[EXIF_IFD_EXIF]->count ||
452 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
455 /* The pointer to IFD_GPS is in IFD_0. */
456 if (data->ifd[EXIF_IFD_GPS]->count)
465 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
472 * Allocate enough memory for all entries
473 * and the number of entries.
475 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
476 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
478 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
482 /* Save the number of entries */
483 exif_set_short (*d + 6 + offset, data->priv->order,
484 (ExifShort) (ifd->count + n_ptr + n_thumb));
487 /* Save each entry */
488 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
489 "Saving %i entries (IFD '%s', offset: %i)...",
490 ifd->count, exif_ifd_get_name (i), offset);
491 for (j = 0; j < ifd->count; j++)
492 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
494 offset += 12 * ifd->count;
496 /* Now save special entries. */
501 * The pointer to IFD_EXIF is in IFD_0.
502 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
503 * therefore, if IFD_INTEROPERABILITY is not empty, we need
504 * IFD_EXIF even if latter is empty.
506 if (data->ifd[EXIF_IFD_EXIF]->count ||
507 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
508 exif_set_short (*d + 6 + offset + 0, data->priv->order,
509 EXIF_TAG_EXIF_IFD_POINTER);
510 exif_set_short (*d + 6 + offset + 2, data->priv->order,
512 exif_set_long (*d + 6 + offset + 4, data->priv->order,
514 exif_set_long (*d + 6 + offset + 8, data->priv->order,
516 exif_data_save_data_content (data,
517 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
521 /* The pointer to IFD_GPS is in IFD_0, too. */
522 if (data->ifd[EXIF_IFD_GPS]->count) {
523 exif_set_short (*d + 6 + offset + 0, data->priv->order,
524 EXIF_TAG_GPS_INFO_IFD_POINTER);
525 exif_set_short (*d + 6 + offset + 2, data->priv->order,
527 exif_set_long (*d + 6 + offset + 4, data->priv->order,
529 exif_set_long (*d + 6 + offset + 8, data->priv->order,
531 exif_data_save_data_content (data,
532 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
540 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
543 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
544 exif_set_short (*d + 6 + offset + 0, data->priv->order,
545 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
546 exif_set_short (*d + 6 + offset + 2, data->priv->order,
548 exif_set_long (*d + 6 + offset + 4, data->priv->order,
550 exif_set_long (*d + 6 + offset + 8, data->priv->order,
552 exif_data_save_data_content (data,
553 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
562 * Information about the thumbnail (if any) is saved in
567 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
568 exif_set_short (*d + 6 + offset + 0, data->priv->order,
569 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
570 exif_set_short (*d + 6 + offset + 2, data->priv->order,
572 exif_set_long (*d + 6 + offset + 4, data->priv->order,
574 exif_set_long (*d + 6 + offset + 8, data->priv->order,
577 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
579 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
583 memcpy (*d + *ds - data->size, data->data, data->size);
586 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
587 exif_set_short (*d + 6 + offset + 0, data->priv->order,
588 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
589 exif_set_short (*d + 6 + offset + 2, data->priv->order,
591 exif_set_long (*d + 6 + offset + 4, data->priv->order,
593 exif_set_long (*d + 6 + offset + 8, data->priv->order,
603 /* Sort the directory according to TIFF specification */
604 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
605 (ifd->count + n_ptr + n_thumb), 12,
606 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
608 /* Correctly terminate the directory */
609 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
613 * We are saving IFD 0. Tell where IFD 1 starts and save
616 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
617 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
620 exif_set_long (*d + 6 + offset, data->priv->order, 0);
624 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
625 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
626 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
627 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3
628 } ExifDataTypeMakerNote;
630 static ExifDataTypeMakerNote
631 exif_data_get_type_maker_note (ExifData *d)
636 if (!d) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
638 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
639 if (!e) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
641 /* Olympus & Nikon */
642 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
643 !memcmp (e->data, "Nikon", 5)))
644 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
646 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
647 if (!em) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
650 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
651 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
653 /* Pentax & some variant of Nikon */
654 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
656 exif_entry_get_value (em, value, sizeof(value)),
658 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
660 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
663 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
666 #define LOG_TOO_SMALL \
667 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
668 _("Size of data too small to allow for EXIF data."));
671 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
672 unsigned int ds_orig)
677 const unsigned char *d = d_orig;
678 unsigned int ds = ds_orig, len;
680 if (!data || !data->priv || !d || !ds) return;
682 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
683 "Parsing %i byte(s) EXIF data...\n", ds);
686 * It can be that the data starts with the EXIF header. If it does
687 * not, search the EXIF marker.
693 if (!memcmp (d, ExifHeader, 6)) {
694 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
695 "Found EXIF header.");
698 while ((d[0] == 0xff) && ds) {
703 /* JPEG_MARKER_SOI */
704 if (d[0] == JPEG_MARKER_SOI) {
710 /* JPEG_MARKER_APP0 */
711 if (d[0] == JPEG_MARKER_APP0) {
714 l = (d[0] << 8) | d[1];
722 /* JPEG_MARKER_APP1 */
723 if (d[0] == JPEG_MARKER_APP1)
726 /* Unknown marker or data. Give up. */
727 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
728 "ExifData", _("EXIF marker not found."));
737 len = (d[0] << 8) | d[1];
738 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
739 "We have to deal with %i byte(s) of EXIF data.",
746 * Verify the exif header
747 * (offset 2, length 6).
753 if (memcmp (d, ExifHeader, 6)) {
754 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
755 "ExifData", _("EXIF header not found."));
759 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
760 "Found EXIF header.");
762 /* Byte order (offset 6, length 2) */
765 if (!memcmp (d + 6, "II", 2))
766 data->priv->order = EXIF_BYTE_ORDER_INTEL;
767 else if (!memcmp (d + 6, "MM", 2))
768 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
770 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
771 "ExifData", _("Unknown encoding."));
776 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
780 offset = exif_get_long (d + 10, data->priv->order);
781 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
782 "IFD 0 at %i.", (int) offset);
784 /* Parse the actual exif data (usually offset 14 from start) */
785 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset);
788 if (offset + 6 + 2 > ds) {
791 n = exif_get_short (d + 6 + offset, data->priv->order);
792 if (offset + 6 + 2 + 12 * n + 4 > ds) {
795 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
797 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
798 "IFD 1 at %i.", (int) offset);
801 if (offset > ds - 6) {
802 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
803 "ExifData", "Bogus offset.");
807 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset);
811 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
812 * cameras use pointers in the maker note tag that point to the
813 * space between IFDs. Here is the only place where we have access
816 switch (exif_data_get_type_maker_note (data)) {
817 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
818 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
820 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
821 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
823 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
824 data->priv->md = exif_mnote_data_canon_new (data->priv->mem);
831 * If we are able to interpret the maker note, do so.
833 if (data->priv->md) {
834 exif_mnote_data_log (data->priv->md, data->priv->log);
835 exif_mnote_data_set_byte_order (data->priv->md,
837 exif_mnote_data_set_offset (data->priv->md,
838 data->priv->offset_mnote);
839 exif_mnote_data_load (data->priv->md, d, ds);
842 if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
843 exif_data_fix (data);
847 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
849 if (!data || !d || !ds)
854 *d = exif_data_alloc (data, *ds);
856 memcpy (*d, ExifHeader, 6);
858 /* Order (offset 6) */
859 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
860 memcpy (*d + 6, "II", 2);
862 memcpy (*d + 6, "MM", 2);
865 /* Fixed value (2 bytes, offset 8) */
866 exif_set_short (*d + 8, data->priv->order, 0x002a);
869 * IFD 0 offset (4 bytes, offset 10).
870 * We will start 8 bytes after the
871 * EXIF header (2 bytes for order, another 2 for the test, and
872 * 4 bytes for the IFD 0 offset make 8 bytes together).
874 exif_set_long (*d + 10, data->priv->order, 8);
876 /* Now save IFD 0. IFD 1 will be saved automatically. */
877 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
879 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
881 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
882 "Saved %i byte(s) EXIF data.", *ds);
886 exif_data_new_from_file (const char *path)
891 loader = exif_loader_new ();
892 exif_loader_write_file (loader, path);
893 edata = exif_loader_get_data (loader);
894 exif_loader_unref (loader);
900 exif_data_ref (ExifData *data)
905 data->priv->ref_count++;
909 exif_data_unref (ExifData *data)
913 data->priv->ref_count--;
914 if (!data->priv->ref_count) exif_data_free (data);
918 exif_data_free (ExifData *data)
921 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
925 for (i = 0; i < EXIF_IFD_COUNT; i++) {
927 exif_content_unref (data->ifd[i]);
933 exif_mem_free (mem, data->data);
938 if (data->priv->log) {
939 exif_log_unref (data->priv->log);
940 data->priv->log = NULL;
942 if (data->priv->md) {
943 exif_mnote_data_unref (data->priv->md);
944 data->priv->md = NULL;
946 exif_mem_free (mem, data->priv);
947 exif_mem_free (mem, data);
950 exif_mem_unref (mem);
954 exif_data_dump (ExifData *data)
961 for (i = 0; i < EXIF_IFD_COUNT; i++) {
962 if (data->ifd[i] && data->ifd[i]->count) {
963 printf ("Dumping IFD '%s'...\n",
964 exif_ifd_get_name (i));
965 exif_content_dump (data->ifd[i], 0);
970 printf ("%i byte(s) thumbnail data available.", data->size);
971 if (data->size >= 4) {
972 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
973 data->data[0], data->data[1],
974 data->data[data->size - 2],
975 data->data[data->size - 1]);
981 exif_data_get_byte_order (ExifData *data)
986 return (data->priv->order);
990 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
998 for (i = 0; i < EXIF_IFD_COUNT; i++)
999 func (data->ifd[i], user_data);
1002 typedef struct _ByteOrderChangeData ByteOrderChangeData;
1003 struct _ByteOrderChangeData {
1004 ExifByteOrder old, new;
1008 entry_set_byte_order (ExifEntry *e, void *data)
1010 ByteOrderChangeData *d = data;
1015 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1019 content_set_byte_order (ExifContent *content, void *data)
1021 exif_content_foreach_entry (content, entry_set_byte_order, data);
1025 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1027 ByteOrderChangeData d;
1029 if (!data || (order == data->priv->order))
1032 d.old = data->priv->order;
1034 exif_data_foreach_content (data, content_set_byte_order, &d);
1035 data->priv->order = order;
1037 exif_mnote_data_set_byte_order (data->priv->md, order);
1041 exif_data_log (ExifData *data, ExifLog *log)
1045 if (!data || !data->priv) return;
1046 exif_log_unref (data->priv->log);
1047 data->priv->log = log;
1050 for (i = 0; i < EXIF_IFD_COUNT; i++)
1051 exif_content_log (data->ifd[i], log);
1054 /* Used internally within libexif */
1055 ExifLog *exif_data_get_log (ExifData *);
1057 exif_data_get_log (ExifData *data)
1059 if (!data || !data->priv) return NULL;
1060 return data->priv->log;
1064 ExifDataOption option;
1066 const char *description;
1067 } exif_data_option[] = {
1068 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1069 N_("Ignore unknown tags when loading EXIF data.")},
1070 {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
1071 N_("Add, correct and remove entries to get EXIF data that follows "
1072 "the specification.")},
1077 exif_data_option_get_name (ExifDataOption o)
1081 for (i = 0; exif_data_option[i].name; i++)
1082 if (exif_data_option[i].option == o) break;
1083 return _(exif_data_option[i].name);
1087 exif_data_option_get_description (ExifDataOption o)
1091 for (i = 0; exif_data_option[i].description; i++)
1092 if (exif_data_option[i].option == o) break;
1093 return _(exif_data_option[i].description);
1097 exif_data_set_option (ExifData *d, ExifDataOption o)
1101 d->priv->options |= o;
1105 exif_data_unset_option (ExifData *d, ExifDataOption o)
1109 d->priv->options &= ~o;
1113 fix_func (ExifContent *c, void *data)
1115 switch (exif_content_get_ifd (c)) {
1117 if (c->parent->data)
1118 exif_content_fix (c);
1120 exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
1121 "No thumbnail but entries on thumbnail. These entries have been "
1124 exif_content_remove_entry (c, c->entries[c->count - 1]);
1128 exif_content_fix (c);
1133 exif_data_fix (ExifData *d)
1135 exif_data_foreach_content (d, fix_func, NULL);
1139 exif_data_set_data_type (ExifData *d, ExifDataType dt)
1141 if (!d || !d->priv) return;
1143 d->priv->data_type = dt;
1147 exif_data_get_data_type (ExifData *d)
1149 return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_COUNT;