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.
22 #include "exif-mnote-data.h"
24 #include "exif-data.h"
26 #include "exif-mnote-data-priv.h"
27 #include "exif-utils.h"
28 #include "exif-loader.h"
29 #include "jpeg-marker.h"
30 #include <libexif/exif-log.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))
45 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
47 struct _ExifDataPrivate
55 unsigned int ref_count;
57 /* Temporarily used while loading data */
58 unsigned int offset_mnote;
62 exif_data_alloc (ExifData *data, unsigned int i)
66 /* This is the only call to calloc in this file. */
70 if (data) EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
75 exif_data_get_mnote_data (ExifData *d)
77 return (d && d->priv) ? d->priv->md : NULL;
86 data = exif_data_alloc (NULL, sizeof (ExifData));
87 if (!data) return (NULL);
88 data->priv = exif_data_alloc (data, sizeof (ExifDataPrivate));
89 if (!data->priv) { free (data); return (NULL); }
90 data->priv->ref_count = 1;
92 for (i = 0; i < EXIF_IFD_COUNT; i++) {
93 data->ifd[i] = exif_content_new ();
95 exif_data_free (data);
98 data->ifd[i]->parent = data;
105 exif_data_new_from_data (const unsigned char *data, unsigned int size)
109 edata = exif_data_new ();
110 exif_data_load_data (edata, data, size);
115 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
116 const unsigned char *d,
117 unsigned int size, unsigned int offset)
119 unsigned int s, doff;
121 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
122 entry->format = exif_get_short (d + offset + 2, data->priv->order);
123 entry->components = exif_get_long (d + offset + 4, data->priv->order);
125 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
126 "Loading entry 0x%x ('%s')...", entry->tag,
127 exif_tag_get_name (entry->tag));
130 * Size? If bigger than 4 bytes, the actual data is not
131 * in the entry but somewhere else (offset).
133 s = exif_format_get_size (entry->format) * entry->components;
137 doff = exif_get_long (d + offset + 8, data->priv->order);
145 entry->data = exif_data_alloc (data, s);
146 if (!entry->data) return;
148 memcpy (entry->data, d + doff, s);
150 /* If this is the MakerNote, remember the offset */
151 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
152 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
153 "MakerNote found (%02x %02x %02x %02x "
154 "%02x %02x %02x...).",
155 entry->data[0], entry->data[1], entry->data[2],
156 entry->data[3], entry->data[4], entry->data[5],
158 data->priv->offset_mnote = doff;
163 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
164 unsigned char **d, unsigned int *ds,
167 unsigned int doff, s;
170 * Each entry is 12 bytes long. The memory for the entry has
171 * already been allocated.
173 exif_set_short (*d + 6 + offset + 0,
174 data->priv->order, (ExifShort) e->tag);
175 exif_set_short (*d + 6 + offset + 2,
176 data->priv->order, (ExifShort) e->format);
178 /* If this is the maker note tag, update it. */
179 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
183 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
184 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
185 e->components = e->size;
188 exif_set_long (*d + 6 + offset + 4,
189 data->priv->order, e->components);
192 * Size? If bigger than 4 bytes, the actual data is not in
193 * the entry but somewhere else.
195 s = exif_format_get_size (e->format) * e->components;
199 *d = realloc (*d, *ds);
201 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
204 exif_set_long (*d + 6 + offset + 8,
205 data->priv->order, doff);
209 /* Write the data. Fill unneeded bytes with 0. */
210 memcpy (*d + 6 + doff, e->data, s);
211 if (s < 4) memset (*d + 6 + doff + s, 0, (4 - s));
215 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
216 unsigned int ds, ExifLong offset, ExifLong size)
218 if (ds < offset + size) {
219 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
220 "Bogus thumbnail offset and size: %i < %i + %i.",
221 (int) ds, (int) offset, (int) size);
224 if (data->data) free (data->data);
226 data->data = exif_data_alloc (data, data->size);
227 if (!data->data) return;
228 memcpy (data->data, d + offset, data->size);
232 exif_data_load_data_content (ExifData *data, ExifContent *ifd,
233 const unsigned char *d,
234 unsigned int ds, unsigned int offset)
236 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
242 /* Read the number of entries */
243 if (offset >= ds - 1) return;
244 n = exif_get_short (d + offset, data->priv->order);
245 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
246 "Loading %i entries...", n);
249 /* Check if we have enough data. */
250 if (offset + 12 * n > ds) n = (ds - offset) / 12;
252 for (i = 0; i < n; i++) {
254 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
256 case EXIF_TAG_EXIF_IFD_POINTER:
257 case EXIF_TAG_GPS_INFO_IFD_POINTER:
258 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
259 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
260 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
261 o = exif_get_long (d + offset + 12 * i + 8,
264 case EXIF_TAG_EXIF_IFD_POINTER:
265 exif_data_load_data_content (data,
266 data->ifd[EXIF_IFD_EXIF], d, ds, o);
268 case EXIF_TAG_GPS_INFO_IFD_POINTER:
269 exif_data_load_data_content (data,
270 data->ifd[EXIF_IFD_GPS], d, ds, o);
272 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
273 exif_data_load_data_content (data,
274 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds, o);
276 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
278 printf ("Thumbnail at %i.\n", (int) o);
280 thumbnail_offset = o;
281 if (thumbnail_offset && thumbnail_length)
282 exif_data_load_data_thumbnail (data, d,
283 ds, thumbnail_offset,
286 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
288 printf ("Thumbnail size: %i.\n", (int) o);
290 thumbnail_length = o;
291 if (thumbnail_offset && thumbnail_length)
292 exif_data_load_data_thumbnail (data, d,
293 ds, thumbnail_offset,
303 * If we don't know the tag, changes are high
304 * that the EXIF data does not follow the standard.
306 if (!exif_tag_get_name (tag)) return;
307 entry = exif_entry_new ();
308 exif_content_add_entry (ifd, entry);
309 exif_data_load_data_entry (data, entry, d, ds,
311 exif_entry_unref (entry);
318 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
319 unsigned char **d, unsigned int *ds,
322 unsigned int j, n_ptr = 0, n_thumb = 0;
325 if (!data || !ifd || !d || !ds)
328 for (i = 0; i < EXIF_IFD_COUNT; i++)
329 if (ifd == data->ifd[i])
331 if (i == EXIF_IFD_COUNT)
335 * Check if we need some extra entries for pointers or the thumbnail.
341 * The pointer to IFD_EXIF is in IFD_0. The pointer to
342 * IFD_INTEROPERABILITY is in IFD_EXIF.
344 if (data->ifd[EXIF_IFD_EXIF]->count ||
345 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
348 /* The pointer to IFD_GPS is in IFD_0. */
349 if (data->ifd[EXIF_IFD_GPS]->count)
358 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
365 * Allocate enough memory for all entries
366 * and the number of entries.
368 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
369 *d = realloc (*d, *ds);
371 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
375 /* Save the number of entries */
376 exif_set_short (*d + 6 + offset, data->priv->order,
377 (ExifShort) (ifd->count + n_ptr + n_thumb));
381 printf ("Saving %i entries (IFD '%s', offset: %i)...\n",
382 ifd->count, exif_ifd_get_name (i), offset);
385 /* Save each entry */
386 for (j = 0; j < ifd->count; j++)
387 exif_data_save_data_entry (data, ifd->entries[j],
388 d, ds, offset + 12 * j);
389 offset += 12 * ifd->count;
391 /* Now save special entries. */
396 * The pointer to IFD_EXIF is in IFD_0.
397 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
398 * therefore, if IFD_INTEROPERABILITY is not empty, we need
399 * IFD_EXIF even if latter is empty.
401 if (data->ifd[EXIF_IFD_EXIF]->count ||
402 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
403 exif_set_short (*d + 6 + offset + 0, data->priv->order,
404 EXIF_TAG_EXIF_IFD_POINTER);
405 exif_set_short (*d + 6 + offset + 2, data->priv->order,
407 exif_set_long (*d + 6 + offset + 4, data->priv->order,
409 exif_set_long (*d + 6 + offset + 8, data->priv->order,
411 exif_data_save_data_content (data,
412 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
416 /* The pointer to IFD_GPS is in IFD_0, too. */
417 if (data->ifd[EXIF_IFD_GPS]->count) {
418 exif_set_short (*d + 6 + offset + 0, data->priv->order,
419 EXIF_TAG_GPS_INFO_IFD_POINTER);
420 exif_set_short (*d + 6 + offset + 2, data->priv->order,
422 exif_set_long (*d + 6 + offset + 4, data->priv->order,
424 exif_set_long (*d + 6 + offset + 8, data->priv->order,
426 exif_data_save_data_content (data,
427 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
435 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
438 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
439 exif_set_short (*d + 6 + offset + 0, data->priv->order,
440 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
441 exif_set_short (*d + 6 + offset + 2, data->priv->order,
443 exif_set_long (*d + 6 + offset + 4, data->priv->order,
445 exif_set_long (*d + 6 + offset + 8, data->priv->order,
447 exif_data_save_data_content (data,
448 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
457 * Information about the thumbnail (if any) is saved in
462 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
463 exif_set_short (*d + 6 + offset + 0, data->priv->order,
464 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
465 exif_set_short (*d + 6 + offset + 2, data->priv->order,
467 exif_set_long (*d + 6 + offset + 4, data->priv->order,
469 exif_set_long (*d + 6 + offset + 8, data->priv->order,
472 *d = realloc (*d, *ds);
474 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
478 memcpy (*d + *ds - data->size, data->data, data->size);
481 printf ("Wrote %i bytes of thumbnail data at offset "
482 "%i.\n", data->size, *ds - data->size);
483 printf ("We currently have %i bytes EXIF data.\n", *ds);
486 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
487 exif_set_short (*d + 6 + offset + 0, data->priv->order,
488 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
489 exif_set_short (*d + 6 + offset + 2, data->priv->order,
491 exif_set_long (*d + 6 + offset + 4, data->priv->order,
493 exif_set_long (*d + 6 + offset + 8, data->priv->order,
503 /* Correctly terminate the directory */
504 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
508 * We are saving IFD 0. Tell where IFD 1 starts and save
511 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
512 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
515 exif_set_long (*d + 6 + offset, data->priv->order, 0);
519 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
520 unsigned int ds_orig)
526 const unsigned char *d = d_orig;
527 unsigned int ds = ds_orig, len;
535 printf ("Parsing %i byte(s) EXIF data...\n", ds);
539 * It can be that the data starts with the EXIF header. If it does
540 * not, search the EXIF marker.
544 printf ("Size too small.\n");
548 if (!memcmp (d, ExifHeader, 6)) {
550 printf ("Found EXIF header.\n");
554 printf ("Data begins with 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x "
555 "0x%x...\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6]);
558 while ((d[0] == 0xff) && ds) {
563 /* JPEG_MARKER_SOI */
564 if (d[0] == JPEG_MARKER_SOI) {
570 /* JPEG_MARKER_APP0 */
571 if (d[0] == JPEG_MARKER_APP0) {
574 l = (d[0] << 8) | d[1];
582 /* JPEG_MARKER_APP1 */
583 if (d[0] == JPEG_MARKER_APP1)
586 /* Unknown marker or data. Give up. */
588 printf ("EXIF marker not found.\n");
596 printf ("Size too small.\n");
600 len = (d[0] << 8) | d[1];
602 printf ("We have to deal with %i byte(s) of EXIF data.\n", len);
609 * Verify the exif header
610 * (offset 2, length 6).
614 printf ("Size too small.\n");
618 if (memcmp (d, ExifHeader, 6)) {
620 printf ("EXIF header not found.\n");
626 printf ("Found EXIF header.\n");
629 /* Byte order (offset 6, length 2) */
632 if (!memcmp (d + 6, "II", 2))
633 data->priv->order = EXIF_BYTE_ORDER_INTEL;
634 else if (!memcmp (d + 6, "MM", 2))
635 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
640 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
644 offset = exif_get_long (d + 10, data->priv->order);
646 printf ("IFD 0 at %i.\n", (int) offset);
649 /* Parse the actual exif data (offset 14) */
650 exif_data_load_data_content (data, data->ifd[EXIF_IFD_0], d + 6,
654 n = exif_get_short (d + 6 + offset, data->priv->order);
655 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
658 printf ("IFD 1 at %i.\n", (int) offset);
662 if (offset > ds - 6) {
664 printf ("Bogus offset!\n");
669 exif_data_load_data_content (data, data->ifd[EXIF_IFD_1], d + 6,
674 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
675 * cameras use pointers in the maker note tag that point to the
676 * space between IFDs. Here is the only place where we have access
679 e = exif_data_get_entry (data, EXIF_TAG_MAKER_NOTE);
682 /* Olympus & Nikon */
683 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
684 !memcmp (e->data, "Nikon", 5))) {
685 data->priv->md = exif_mnote_data_olympus_new ();
688 em = exif_data_get_entry (data, EXIF_TAG_MAKE);
689 /* Pentax & some variant of Nikon */
690 if ((e->size >= 2) && (e->data[0] == 0x00)
691 && (e->data[1] == 0x1b)) {
692 if (em && !strncasecmp (exif_entry_get_value (em, value, sizeof(value)), "Nikon", 5)) {
693 data->priv->md = exif_mnote_data_olympus_new ();
695 data->priv->md = exif_mnote_data_pentax_new ();
702 if (!strcmp (exif_entry_get_value (em, value, sizeof(value)), "Canon"))
703 data->priv->md = exif_mnote_data_canon_new ();
709 * If we are able to interpret the maker note, do so.
711 if (data->priv->md) {
712 exif_mnote_data_log (data->priv->md, data->priv->log);
713 exif_mnote_data_set_byte_order (data->priv->md,
715 exif_mnote_data_set_offset (data->priv->md,
716 data->priv->offset_mnote);
717 exif_mnote_data_load (data->priv->md, d, ds);
723 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
725 if (!data || !d || !ds)
730 *d = exif_data_alloc (data, *ds);
732 memcpy (*d, ExifHeader, 6);
734 /* Order (offset 6) */
735 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
736 memcpy (*d + 6, "II", 2);
738 memcpy (*d + 6, "MM", 2);
741 /* Fixed value (2 bytes, offset 8) */
742 exif_set_short (*d + 8, data->priv->order, 0x002a);
745 * IFD 0 offset (4 bytes, offset 10).
746 * We will start 8 bytes after the
747 * EXIF header (2 bytes for order, another 2 for the test, and
748 * 4 bytes for the IFD 0 offset make 8 bytes together).
750 exif_set_long (*d + 10, data->priv->order, 8);
752 /* Now save IFD 0. IFD 1 will be saved automatically. */
754 printf ("Saving IFDs...\n");
756 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
760 printf ("Saved %i byte(s) EXIF data.\n", *ds);
765 exif_data_new_from_file (const char *path)
770 loader = exif_loader_new ();
771 exif_loader_write_file (loader, path);
772 edata = exif_loader_get_data (loader);
773 exif_loader_unref (loader);
779 exif_data_ref (ExifData *data)
784 data->priv->ref_count++;
788 exif_data_unref (ExifData *data)
793 data->priv->ref_count--;
794 if (!data->priv->ref_count)
795 exif_data_free (data);
799 exif_data_free (ExifData *data)
806 for (i = 0; i < EXIF_IFD_COUNT; i++) {
808 exif_content_unref (data->ifd[i]);
817 if (data->priv->md) {
818 exif_mnote_data_unref (data->priv->md);
819 data->priv->md = NULL;
828 exif_data_dump (ExifData *data)
835 for (i = 0; i < EXIF_IFD_COUNT; i++) {
836 if (data->ifd[i] && data->ifd[i]->count) {
837 printf ("Dumping IFD '%s'...\n",
838 exif_ifd_get_name (i));
839 exif_content_dump (data->ifd[i], 0);
844 printf ("%i byte(s) thumbnail data available.", data->size);
845 if (data->size >= 4) {
846 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
847 data->data[0], data->data[1],
848 data->data[data->size - 2],
849 data->data[data->size - 1]);
855 exif_data_get_byte_order (ExifData *data)
860 return (data->priv->order);
864 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
872 for (i = 0; i < EXIF_IFD_COUNT; i++)
873 func (data->ifd[i], user_data);
876 typedef struct _ByteOrderChangeData ByteOrderChangeData;
877 struct _ByteOrderChangeData {
878 ExifByteOrder old, new;
882 entry_set_byte_order (ExifEntry *e, void *data)
884 ByteOrderChangeData *d = data;
896 case EXIF_FORMAT_SHORT:
897 for (i = 0; i < e->components; i++) {
898 s = exif_get_short (e->data +
899 (i * exif_format_get_size (e->format)),
901 exif_set_short (e->data +
902 (i * exif_format_get_size (e->format)),
906 case EXIF_FORMAT_LONG:
907 for (i = 0; i < e->components; i++) {
908 l = exif_get_long (e->data +
909 (i * exif_format_get_size (e->format)),
911 exif_set_long (e->data +
912 (i * exif_format_get_size (e->format)),
916 case EXIF_FORMAT_RATIONAL:
917 for (i = 0; i < e->components; i++) {
918 r = exif_get_rational (e->data +
919 (i * exif_format_get_size (e->format)),
921 exif_set_rational (e->data +
922 (i * exif_format_get_size (e->format)),
926 case EXIF_FORMAT_SLONG:
927 for (i = 0; i < e->components; i++) {
928 sl = exif_get_slong (e->data +
929 (i * exif_format_get_size (e->format)),
931 exif_set_slong (e->data +
932 (i * exif_format_get_size (e->format)),
936 case EXIF_FORMAT_SRATIONAL:
937 for (i = 0; i < e->components; i++) {
938 sr = exif_get_srational (e->data +
939 (i * exif_format_get_size (e->format)),
941 exif_set_srational (e->data +
942 (i * exif_format_get_size (e->format)),
946 case EXIF_FORMAT_UNDEFINED:
947 case EXIF_FORMAT_BYTE:
948 case EXIF_FORMAT_SBYTE:
949 case EXIF_FORMAT_ASCII:
957 content_set_byte_order (ExifContent *content, void *data)
959 exif_content_foreach_entry (content, entry_set_byte_order, data);
963 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
965 ByteOrderChangeData d;
967 if (!data || (order == data->priv->order))
970 d.old = data->priv->order;
972 exif_data_foreach_content (data, content_set_byte_order, &d);
973 data->priv->order = order;
975 exif_mnote_data_set_byte_order (data->priv->md, order);
979 exif_data_log (ExifData *data, ExifLog *log)
981 if (!data || !data->priv) return;
982 exif_log_unref (data->priv->log);
983 data->priv->log = log;
987 /* Used internally within libexif */
988 ExifLog *exif_data_get_log (ExifData *);
990 exif_data_get_log (ExifData *data)
992 if (!data || !data->priv) return NULL;
993 return data->priv->log;