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;
74 exif_data_alloc (ExifData *data, unsigned int i)
78 if (!data || !i) return NULL;
80 d = exif_mem_alloc (data->priv->mem, i);
83 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
88 exif_data_get_mnote_data (ExifData *d)
90 return (d && d->priv) ? d->priv->md : NULL;
96 ExifMem *mem = exif_mem_new_default ();
97 ExifData *d = exif_data_new_mem (mem);
105 exif_data_new_mem (ExifMem *mem)
110 if (!mem) return NULL;
112 data = exif_mem_alloc (mem, sizeof (ExifData));
113 if (!data) return (NULL);
114 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
115 if (!data->priv) { exif_mem_free (mem, data); return (NULL); }
116 data->priv->ref_count = 1;
118 data->priv->mem = mem;
121 for (i = 0; i < EXIF_IFD_COUNT; i++) {
122 data->ifd[i] = exif_content_new_mem (data->priv->mem);
124 exif_data_free (data);
127 data->ifd[i]->parent = data;
130 /* Standard options */
131 exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
132 exif_data_set_option (data, EXIF_DATA_OPTION_FIX_INVALID_FORMAT);
138 exif_data_new_from_data (const unsigned char *data, unsigned int size)
142 edata = exif_data_new ();
143 exif_data_load_data (edata, data, size);
148 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
149 const unsigned char *d,
150 unsigned int size, unsigned int offset)
152 unsigned int s, doff;
154 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
155 entry->format = exif_get_short (d + offset + 2, data->priv->order);
156 entry->components = exif_get_long (d + offset + 4, data->priv->order);
158 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
159 "Loading entry 0x%x ('%s')...", entry->tag,
160 exif_tag_get_name (entry->tag));
163 * Size? If bigger than 4 bytes, the actual data is not
164 * in the entry but somewhere else (offset).
166 s = exif_format_get_size (entry->format) * entry->components;
170 doff = exif_get_long (d + offset + 8, data->priv->order);
178 entry->data = exif_data_alloc (data, s);
181 memcpy (entry->data, d + doff, s);
184 /* If this is the MakerNote, remember the offset */
185 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
186 if (entry->size > 6) exif_log (data->priv->log,
187 EXIF_LOG_CODE_DEBUG, "ExifData",
188 "MakerNote found (%02x %02x %02x %02x "
189 "%02x %02x %02x...).",
190 entry->data[0], entry->data[1], entry->data[2],
191 entry->data[3], entry->data[4], entry->data[5],
193 data->priv->offset_mnote = doff;
196 if (data->priv->options & EXIF_DATA_OPTION_FIX_INVALID_FORMAT)
197 exif_entry_fix (entry);
201 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
202 unsigned char **d, unsigned int *ds,
205 unsigned int doff, s;
207 if (!data || !data->priv) return;
210 * Each entry is 12 bytes long. The memory for the entry has
211 * already been allocated.
213 exif_set_short (*d + 6 + offset + 0,
214 data->priv->order, (ExifShort) e->tag);
215 exif_set_short (*d + 6 + offset + 2,
216 data->priv->order, (ExifShort) e->format);
218 #ifndef EXIF_DONT_CHANGE_MAKER_NOTE
219 /* If this is the maker note tag, update it. */
220 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
221 exif_mem_free (data->priv->mem, e->data);
224 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
225 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
226 e->components = e->size;
230 exif_set_long (*d + 6 + offset + 4,
231 data->priv->order, e->components);
234 * Size? If bigger than 4 bytes, the actual data is not in
235 * the entry but somewhere else.
237 s = exif_format_get_size (e->format) * e->components;
243 * According to the TIFF specification,
244 * the offset must be an even number. If we need to introduce
245 * a padding byte, we set it to 0.
248 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
250 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
253 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
254 if (s & 1) *(*d + *ds - 1) = '\0';
259 /* Write the data. Fill unneeded bytes with 0. */
260 memcpy (*d + 6 + doff, e->data, s);
261 if (s < 4) memset (*d + 6 + doff + s, 0, (4 - s));
265 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
266 unsigned int ds, ExifLong offset, ExifLong size)
268 if (ds < offset + size) {
269 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
270 "Bogus thumbnail offset and size: %i < %i + %i.",
271 (int) ds, (int) offset, (int) size);
274 if (data->data) exif_mem_free (data->priv->mem, data->data);
276 data->data = exif_data_alloc (data, data->size);
277 if (!data->data) return;
278 memcpy (data->data, d + offset, data->size);
282 #define CHECK_REC(i) \
284 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
285 "ExifData", "Recursive entry in IFD " \
286 "'%s' detected. Skipping...", \
287 exif_ifd_get_name (i)); \
290 if (data->ifd[(i)]->count) { \
291 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
292 "ExifData", "Attemt to load IFD " \
293 "'%s' multiple times detected. " \
295 exif_ifd_get_name (i)); \
300 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
301 const unsigned char *d,
302 unsigned int ds, unsigned int offset)
304 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
310 if (!data || !data->priv) return;
311 if ((ifd < 0) || (ifd >= EXIF_IFD_COUNT)) return;
313 /* Read the number of entries */
314 if (offset >= ds - 1) return;
315 n = exif_get_short (d + offset, data->priv->order);
316 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
317 "Loading %i entries...", n);
320 /* Check if we have enough data. */
321 if (offset + 12 * n > ds) n = (ds - offset) / 12;
323 for (i = 0; i < n; i++) {
325 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
327 case EXIF_TAG_EXIF_IFD_POINTER:
328 case EXIF_TAG_GPS_INFO_IFD_POINTER:
329 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
330 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
331 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
332 o = exif_get_long (d + offset + 12 * i + 8,
335 case EXIF_TAG_EXIF_IFD_POINTER:
336 CHECK_REC (EXIF_IFD_EXIF);
337 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o);
339 case EXIF_TAG_GPS_INFO_IFD_POINTER:
340 CHECK_REC (EXIF_IFD_GPS);
341 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o);
343 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
344 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
345 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o);
347 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
348 thumbnail_offset = o;
349 if (thumbnail_offset && thumbnail_length)
350 exif_data_load_data_thumbnail (data, d,
351 ds, thumbnail_offset,
354 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
355 thumbnail_length = o;
356 if (thumbnail_offset && thumbnail_length)
357 exif_data_load_data_thumbnail (data, d,
358 ds, thumbnail_offset,
368 * If we don't know the tag, don't fail. It could be that new
369 * versions of the standard have defined additional tags. Note that
370 * 0 is a valid tag in the GPS IFD.
372 if (!exif_tag_get_name_in_ifd (tag, ifd)) {
373 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
374 "Unknown tag 0x%04x (entry %i in '%s'). Please report this tag "
375 "to <libexif-devel@lists.sourceforge.net>.", tag, i,
376 exif_ifd_get_name (ifd));
377 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
380 entry = exif_entry_new_mem (data->priv->mem);
381 exif_data_load_data_entry (data, entry, d, ds,
383 exif_content_add_entry (data->ifd[ifd], entry);
384 exif_entry_unref (entry);
391 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
393 ExifShort tag1 = exif_get_short (p1, o);
394 ExifShort tag2 = exif_get_short (p2, o);
396 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
400 cmp_func_intel (const void *elem1, const void *elem2)
402 return cmp_func ((const unsigned char *) elem1,
403 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
407 cmp_func_motorola (const void *elem1, const void *elem2)
409 return cmp_func ((const unsigned char *) elem1,
410 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
414 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
415 unsigned char **d, unsigned int *ds,
418 unsigned int j, n_ptr = 0, n_thumb = 0;
421 if (!data || !data->priv || !ifd || !d || !ds) return;
423 for (i = 0; i < EXIF_IFD_COUNT; i++)
424 if (ifd == data->ifd[i])
426 if (i == EXIF_IFD_COUNT)
430 * Check if we need some extra entries for pointers or the thumbnail.
436 * The pointer to IFD_EXIF is in IFD_0. The pointer to
437 * IFD_INTEROPERABILITY is in IFD_EXIF.
439 if (data->ifd[EXIF_IFD_EXIF]->count ||
440 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
443 /* The pointer to IFD_GPS is in IFD_0. */
444 if (data->ifd[EXIF_IFD_GPS]->count)
453 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
460 * Allocate enough memory for all entries
461 * and the number of entries.
463 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
464 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
466 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
470 /* Save the number of entries */
471 exif_set_short (*d + 6 + offset, data->priv->order,
472 (ExifShort) (ifd->count + n_ptr + n_thumb));
475 /* Save each entry */
476 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
477 "Saving %i entries (IFD '%s', offset: %i)...",
478 ifd->count, exif_ifd_get_name (i), offset);
479 for (j = 0; j < ifd->count; j++)
480 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
482 offset += 12 * ifd->count;
484 /* Now save special entries. */
489 * The pointer to IFD_EXIF is in IFD_0.
490 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
491 * therefore, if IFD_INTEROPERABILITY is not empty, we need
492 * IFD_EXIF even if latter is empty.
494 if (data->ifd[EXIF_IFD_EXIF]->count ||
495 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
496 exif_set_short (*d + 6 + offset + 0, data->priv->order,
497 EXIF_TAG_EXIF_IFD_POINTER);
498 exif_set_short (*d + 6 + offset + 2, data->priv->order,
500 exif_set_long (*d + 6 + offset + 4, data->priv->order,
502 exif_set_long (*d + 6 + offset + 8, data->priv->order,
504 exif_data_save_data_content (data,
505 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
509 /* The pointer to IFD_GPS is in IFD_0, too. */
510 if (data->ifd[EXIF_IFD_GPS]->count) {
511 exif_set_short (*d + 6 + offset + 0, data->priv->order,
512 EXIF_TAG_GPS_INFO_IFD_POINTER);
513 exif_set_short (*d + 6 + offset + 2, data->priv->order,
515 exif_set_long (*d + 6 + offset + 4, data->priv->order,
517 exif_set_long (*d + 6 + offset + 8, data->priv->order,
519 exif_data_save_data_content (data,
520 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
528 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
531 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
532 exif_set_short (*d + 6 + offset + 0, data->priv->order,
533 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
534 exif_set_short (*d + 6 + offset + 2, data->priv->order,
536 exif_set_long (*d + 6 + offset + 4, data->priv->order,
538 exif_set_long (*d + 6 + offset + 8, data->priv->order,
540 exif_data_save_data_content (data,
541 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
550 * Information about the thumbnail (if any) is saved in
555 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
556 exif_set_short (*d + 6 + offset + 0, data->priv->order,
557 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
558 exif_set_short (*d + 6 + offset + 2, data->priv->order,
560 exif_set_long (*d + 6 + offset + 4, data->priv->order,
562 exif_set_long (*d + 6 + offset + 8, data->priv->order,
565 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
567 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
571 memcpy (*d + *ds - data->size, data->data, data->size);
574 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
575 exif_set_short (*d + 6 + offset + 0, data->priv->order,
576 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
577 exif_set_short (*d + 6 + offset + 2, data->priv->order,
579 exif_set_long (*d + 6 + offset + 4, data->priv->order,
581 exif_set_long (*d + 6 + offset + 8, data->priv->order,
591 /* Sort the directory according to TIFF specification */
592 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
593 (ifd->count + n_ptr + n_thumb), 12,
594 (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
596 /* Correctly terminate the directory */
597 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
601 * We are saving IFD 0. Tell where IFD 1 starts and save
604 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
605 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
608 exif_set_long (*d + 6 + offset, data->priv->order, 0);
612 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
613 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
614 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
615 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3
616 } ExifDataTypeMakerNote;
618 static ExifDataTypeMakerNote
619 exif_data_get_type_maker_note (ExifData *d)
624 if (!d) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
626 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
627 if (!e) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
629 /* Olympus & Nikon */
630 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
631 !memcmp (e->data, "Nikon", 5)))
632 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
634 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
635 if (!em) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
638 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
639 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
641 /* Pentax & some variant of Nikon */
642 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
644 exif_entry_get_value (em, value, sizeof(value)),
646 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
648 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
651 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
654 #define LOG_TOO_SMALL \
655 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
656 _("Size of data too small to allow for EXIF data."));
659 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
660 unsigned int ds_orig)
665 const unsigned char *d = d_orig;
666 unsigned int ds = ds_orig, len;
668 if (!data || !data->priv || !d || !ds) return;
670 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
671 "Parsing %i byte(s) EXIF data...\n", ds);
674 * It can be that the data starts with the EXIF header. If it does
675 * not, search the EXIF marker.
681 if (!memcmp (d, ExifHeader, 6)) {
682 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
683 "Found EXIF header.");
686 while ((d[0] == 0xff) && ds) {
691 /* JPEG_MARKER_SOI */
692 if (d[0] == JPEG_MARKER_SOI) {
698 /* JPEG_MARKER_APP0 */
699 if (d[0] == JPEG_MARKER_APP0) {
702 l = (d[0] << 8) | d[1];
710 /* JPEG_MARKER_APP1 */
711 if (d[0] == JPEG_MARKER_APP1)
714 /* Unknown marker or data. Give up. */
715 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
716 "ExifData", _("EXIF marker not found."));
725 len = (d[0] << 8) | d[1];
726 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
727 "We have to deal with %i byte(s) of EXIF data.",
734 * Verify the exif header
735 * (offset 2, length 6).
741 if (memcmp (d, ExifHeader, 6)) {
742 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
743 "ExifData", _("EXIF header not found."));
747 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
748 "Found EXIF header.");
750 /* Byte order (offset 6, length 2) */
753 if (!memcmp (d + 6, "II", 2))
754 data->priv->order = EXIF_BYTE_ORDER_INTEL;
755 else if (!memcmp (d + 6, "MM", 2))
756 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
758 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
759 "ExifData", _("Unknown encoding."));
764 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
768 offset = exif_get_long (d + 10, data->priv->order);
769 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
770 "IFD 0 at %i.", (int) offset);
772 /* Parse the actual exif data (usually offset 14 from start) */
773 exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset);
776 if (offset + 6 + 2 > ds) {
779 n = exif_get_short (d + 6 + offset, data->priv->order);
780 if (offset + 6 + 2 + 12 * n + 4 > ds) {
783 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
785 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
786 "IFD 1 at %i.", (int) offset);
789 if (offset > ds - 6) {
790 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
791 "ExifData", "Bogus offset.");
795 exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset);
799 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
800 * cameras use pointers in the maker note tag that point to the
801 * space between IFDs. Here is the only place where we have access
804 switch (exif_data_get_type_maker_note (data)) {
805 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
806 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
808 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
809 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
811 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
812 data->priv->md = exif_mnote_data_canon_new (data->priv->mem);
819 * If we are able to interpret the maker note, do so.
821 if (data->priv->md) {
822 exif_mnote_data_log (data->priv->md, data->priv->log);
823 exif_mnote_data_set_byte_order (data->priv->md,
825 exif_mnote_data_set_offset (data->priv->md,
826 data->priv->offset_mnote);
827 exif_mnote_data_load (data->priv->md, d, ds);
832 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
834 if (!data || !d || !ds)
839 *d = exif_data_alloc (data, *ds);
841 memcpy (*d, ExifHeader, 6);
843 /* Order (offset 6) */
844 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
845 memcpy (*d + 6, "II", 2);
847 memcpy (*d + 6, "MM", 2);
850 /* Fixed value (2 bytes, offset 8) */
851 exif_set_short (*d + 8, data->priv->order, 0x002a);
854 * IFD 0 offset (4 bytes, offset 10).
855 * We will start 8 bytes after the
856 * EXIF header (2 bytes for order, another 2 for the test, and
857 * 4 bytes for the IFD 0 offset make 8 bytes together).
859 exif_set_long (*d + 10, data->priv->order, 8);
861 /* Now save IFD 0. IFD 1 will be saved automatically. */
862 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
864 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
866 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
867 "Saved %i byte(s) EXIF data.", *ds);
871 exif_data_new_from_file (const char *path)
876 loader = exif_loader_new ();
877 exif_loader_write_file (loader, path);
878 edata = exif_loader_get_data (loader);
879 exif_loader_unref (loader);
885 exif_data_ref (ExifData *data)
890 data->priv->ref_count++;
894 exif_data_unref (ExifData *data)
898 data->priv->ref_count--;
899 if (!data->priv->ref_count) exif_data_free (data);
903 exif_data_free (ExifData *data)
906 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
910 for (i = 0; i < EXIF_IFD_COUNT; i++) {
912 exif_content_unref (data->ifd[i]);
918 exif_mem_free (mem, data->data);
923 if (data->priv->log) {
924 exif_log_unref (data->priv->log);
925 data->priv->log = NULL;
927 if (data->priv->md) {
928 exif_mnote_data_unref (data->priv->md);
929 data->priv->md = NULL;
931 exif_mem_free (mem, data->priv);
932 exif_mem_free (mem, data);
935 exif_mem_unref (mem);
939 exif_data_dump (ExifData *data)
946 for (i = 0; i < EXIF_IFD_COUNT; i++) {
947 if (data->ifd[i] && data->ifd[i]->count) {
948 printf ("Dumping IFD '%s'...\n",
949 exif_ifd_get_name (i));
950 exif_content_dump (data->ifd[i], 0);
955 printf ("%i byte(s) thumbnail data available.", data->size);
956 if (data->size >= 4) {
957 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
958 data->data[0], data->data[1],
959 data->data[data->size - 2],
960 data->data[data->size - 1]);
966 exif_data_get_byte_order (ExifData *data)
971 return (data->priv->order);
975 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
983 for (i = 0; i < EXIF_IFD_COUNT; i++)
984 func (data->ifd[i], user_data);
987 typedef struct _ByteOrderChangeData ByteOrderChangeData;
988 struct _ByteOrderChangeData {
989 ExifByteOrder old, new;
993 entry_set_byte_order (ExifEntry *e, void *data)
995 ByteOrderChangeData *d = data;
1000 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
1004 content_set_byte_order (ExifContent *content, void *data)
1006 exif_content_foreach_entry (content, entry_set_byte_order, data);
1010 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1012 ByteOrderChangeData d;
1014 if (!data || (order == data->priv->order))
1017 d.old = data->priv->order;
1019 exif_data_foreach_content (data, content_set_byte_order, &d);
1020 data->priv->order = order;
1022 exif_mnote_data_set_byte_order (data->priv->md, order);
1026 exif_data_log (ExifData *data, ExifLog *log)
1030 if (!data || !data->priv) return;
1031 exif_log_unref (data->priv->log);
1032 data->priv->log = log;
1035 for (i = 0; i < EXIF_IFD_COUNT; i++)
1036 exif_content_log (data->ifd[i], log);
1039 /* Used internally within libexif */
1040 ExifLog *exif_data_get_log (ExifData *);
1042 exif_data_get_log (ExifData *data)
1044 if (!data || !data->priv) return NULL;
1045 return data->priv->log;
1049 ExifDataOption option;
1051 const char *description;
1052 } exif_data_option[] = {
1053 {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
1054 N_("Ignore unknown tags when loading EXIF data.")},
1055 {EXIF_DATA_OPTION_FIX_INVALID_FORMAT, N_("Fix invalid format"),
1056 N_("Automatically fix the format of entries "
1057 "that are not in the correct format.")},
1062 exif_data_option_get_name (ExifDataOption o)
1066 for (i = 0; exif_data_option[i].name; i++)
1067 if (exif_data_option[i].option == o) break;
1068 return _(exif_data_option[i].name);
1072 exif_data_option_get_description (ExifDataOption o)
1076 for (i = 0; exif_data_option[i].description; i++)
1077 if (exif_data_option[i].option == o) break;
1078 return _(exif_data_option[i].description);
1082 exif_data_set_option (ExifData *d, ExifDataOption o)
1086 d->priv->options |= o;
1090 exif_data_unset_option (ExifData *d, ExifDataOption o)
1094 d->priv->options &= ~o;