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;
72 exif_data_alloc (ExifData *data, unsigned int i)
76 if (!data || !i) return NULL;
78 d = exif_mem_alloc (data->priv->mem, i);
81 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
86 exif_data_get_mnote_data (ExifData *d)
88 return (d && d->priv) ? d->priv->md : NULL;
94 ExifMem *mem = exif_mem_new_default ();
95 ExifData *d = exif_data_new_mem (mem);
103 exif_data_new_mem (ExifMem *mem)
108 if (!mem) return NULL;
110 data = exif_mem_alloc (mem, sizeof (ExifData));
111 if (!data) return (NULL);
112 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
113 if (!data->priv) { exif_mem_free (mem, data); return (NULL); }
114 data->priv->ref_count = 1;
116 data->priv->mem = mem;
119 for (i = 0; i < EXIF_IFD_COUNT; i++) {
120 data->ifd[i] = exif_content_new_mem (data->priv->mem);
122 exif_data_free (data);
125 data->ifd[i]->parent = data;
132 exif_data_new_from_data (const unsigned char *data, unsigned int size)
136 edata = exif_data_new ();
137 exif_data_load_data (edata, data, size);
142 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
143 const unsigned char *d,
144 unsigned int size, unsigned int offset)
146 unsigned int s, doff;
148 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
149 entry->format = exif_get_short (d + offset + 2, data->priv->order);
150 entry->components = exif_get_long (d + offset + 4, data->priv->order);
152 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
153 "Loading entry 0x%x ('%s')...", entry->tag,
154 exif_tag_get_name (entry->tag));
157 * Size? If bigger than 4 bytes, the actual data is not
158 * in the entry but somewhere else (offset).
160 s = exif_format_get_size (entry->format) * entry->components;
164 doff = exif_get_long (d + offset + 8, data->priv->order);
172 entry->data = exif_data_alloc (data, s);
175 memcpy (entry->data, d + doff, s);
178 /* If this is the MakerNote, remember the offset */
179 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
180 if (entry->size > 6) exif_log (data->priv->log,
181 EXIF_LOG_CODE_DEBUG, "ExifData",
182 "MakerNote found (%02x %02x %02x %02x "
183 "%02x %02x %02x...).",
184 entry->data[0], entry->data[1], entry->data[2],
185 entry->data[3], entry->data[4], entry->data[5],
187 data->priv->offset_mnote = doff;
190 exif_entry_fix (entry);
194 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
195 unsigned char **d, unsigned int *ds,
198 unsigned int doff, s;
200 if (!data || !data->priv) return;
203 * Each entry is 12 bytes long. The memory for the entry has
204 * already been allocated.
206 exif_set_short (*d + 6 + offset + 0,
207 data->priv->order, (ExifShort) e->tag);
208 exif_set_short (*d + 6 + offset + 2,
209 data->priv->order, (ExifShort) e->format);
211 #ifndef EXIF_DONT_CHANGE_MAKER_NOTE
212 /* If this is the maker note tag, update it. */
213 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
214 exif_mem_free (data->priv->mem, e->data);
217 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
218 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
219 e->components = e->size;
223 exif_set_long (*d + 6 + offset + 4,
224 data->priv->order, e->components);
227 * Size? If bigger than 4 bytes, the actual data is not in
228 * the entry but somewhere else.
230 s = exif_format_get_size (e->format) * e->components;
236 * According to the TIFF specification,
237 * the offset must be an even number. If we need to introduce
238 * a padding byte, we set it to 0.
241 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
243 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
246 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
247 if (s & 1) *(*d + *ds - 1) = '\0';
252 /* Write the data. Fill unneeded bytes with 0. */
253 memcpy (*d + 6 + doff, e->data, s);
254 if (s < 4) memset (*d + 6 + doff + s, 0, (4 - s));
258 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
259 unsigned int ds, ExifLong offset, ExifLong size)
261 if (ds < offset + size) {
262 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
263 "Bogus thumbnail offset and size: %i < %i + %i.",
264 (int) ds, (int) offset, (int) size);
267 if (data->data) exif_mem_free (data->priv->mem, data->data);
269 data->data = exif_data_alloc (data, data->size);
270 if (!data->data) return;
271 memcpy (data->data, d + offset, data->size);
275 #define CHECK_REC(i) \
276 if (data->ifd[(i)] == ifd) { \
277 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
278 "ExifData", "Recursive entry in IFD " \
279 "'%s' detected. Skipping...", \
280 exif_ifd_get_name (i)); \
283 if (data->ifd[(i)]->count) { \
284 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
285 "ExifData", "Attemt to load IFD " \
286 "'%s' multiple times detected. " \
288 exif_ifd_get_name (i)); \
293 exif_data_load_data_content (ExifData *data, ExifContent *ifd,
294 const unsigned char *d,
295 unsigned int ds, unsigned int offset)
297 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
303 if (!data || !data->priv) return;
305 /* Read the number of entries */
306 if (offset >= ds - 1) return;
307 n = exif_get_short (d + offset, data->priv->order);
308 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
309 "Loading %i entries...", n);
312 /* Check if we have enough data. */
313 if (offset + 12 * n > ds) n = (ds - offset) / 12;
315 for (i = 0; i < n; i++) {
317 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
319 case EXIF_TAG_EXIF_IFD_POINTER:
320 case EXIF_TAG_GPS_INFO_IFD_POINTER:
321 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
322 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
323 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
324 o = exif_get_long (d + offset + 12 * i + 8,
327 case EXIF_TAG_EXIF_IFD_POINTER:
328 CHECK_REC (EXIF_IFD_EXIF);
329 exif_data_load_data_content (data,
330 data->ifd[EXIF_IFD_EXIF], d, ds, o);
332 case EXIF_TAG_GPS_INFO_IFD_POINTER:
333 CHECK_REC (EXIF_IFD_GPS);
334 exif_data_load_data_content (data,
335 data->ifd[EXIF_IFD_GPS], d, ds, o);
337 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
338 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
339 exif_data_load_data_content (data,
340 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds, o);
342 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
343 thumbnail_offset = o;
344 if (thumbnail_offset && thumbnail_length)
345 exif_data_load_data_thumbnail (data, d,
346 ds, thumbnail_offset,
349 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
350 thumbnail_length = o;
351 if (thumbnail_offset && thumbnail_length)
352 exif_data_load_data_thumbnail (data, d,
353 ds, thumbnail_offset,
363 * If we don't know the tag, chances are high
364 * that the EXIF data does not follow the standard.
366 if (!exif_tag_get_name (tag)) {
367 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
368 "Unknown tag %x (entry %i)", tag, i);
371 entry = exif_entry_new_mem (data->priv->mem);
372 exif_data_load_data_entry (data, entry, d, ds,
374 exif_content_add_entry (ifd, entry);
375 exif_entry_unref (entry);
382 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
384 ExifShort tag1 = exif_get_short (p1, o);
385 ExifShort tag2 = exif_get_short (p2, o);
387 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
391 cmp_func_intel (const void *elem1, const void *elem2)
393 return cmp_func ((const unsigned char *) elem1,
394 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
398 cmp_func_motorola (const void *elem1, const void *elem2)
400 return cmp_func ((const unsigned char *) elem1,
401 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
405 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
406 unsigned char **d, unsigned int *ds,
409 unsigned int j, n_ptr = 0, n_thumb = 0;
412 if (!data || !data->priv || !ifd || !d || !ds) return;
414 for (i = 0; i < EXIF_IFD_COUNT; i++)
415 if (ifd == data->ifd[i])
417 if (i == EXIF_IFD_COUNT)
421 * Check if we need some extra entries for pointers or the thumbnail.
427 * The pointer to IFD_EXIF is in IFD_0. The pointer to
428 * IFD_INTEROPERABILITY is in IFD_EXIF.
430 if (data->ifd[EXIF_IFD_EXIF]->count ||
431 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
434 /* The pointer to IFD_GPS is in IFD_0. */
435 if (data->ifd[EXIF_IFD_GPS]->count)
444 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
451 * Allocate enough memory for all entries
452 * and the number of entries.
454 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
455 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
457 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
461 /* Save the number of entries */
462 exif_set_short (*d + 6 + offset, data->priv->order,
463 (ExifShort) (ifd->count + n_ptr + n_thumb));
466 /* Save each entry */
467 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
468 "Saving %i entries (IFD '%s', offset: %i)...",
469 ifd->count, exif_ifd_get_name (i), offset);
470 for (j = 0; j < ifd->count; j++)
471 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
473 offset += 12 * ifd->count;
475 /* Now save special entries. */
480 * The pointer to IFD_EXIF is in IFD_0.
481 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
482 * therefore, if IFD_INTEROPERABILITY is not empty, we need
483 * IFD_EXIF even if latter is empty.
485 if (data->ifd[EXIF_IFD_EXIF]->count ||
486 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
487 exif_set_short (*d + 6 + offset + 0, data->priv->order,
488 EXIF_TAG_EXIF_IFD_POINTER);
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,
495 exif_data_save_data_content (data,
496 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
500 /* The pointer to IFD_GPS is in IFD_0, too. */
501 if (data->ifd[EXIF_IFD_GPS]->count) {
502 exif_set_short (*d + 6 + offset + 0, data->priv->order,
503 EXIF_TAG_GPS_INFO_IFD_POINTER);
504 exif_set_short (*d + 6 + offset + 2, data->priv->order,
506 exif_set_long (*d + 6 + offset + 4, data->priv->order,
508 exif_set_long (*d + 6 + offset + 8, data->priv->order,
510 exif_data_save_data_content (data,
511 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
519 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
522 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
523 exif_set_short (*d + 6 + offset + 0, data->priv->order,
524 EXIF_TAG_INTEROPERABILITY_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_INTEROPERABILITY], d, ds,
541 * Information about the thumbnail (if any) is saved in
546 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
547 exif_set_short (*d + 6 + offset + 0, data->priv->order,
548 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
549 exif_set_short (*d + 6 + offset + 2, data->priv->order,
551 exif_set_long (*d + 6 + offset + 4, data->priv->order,
553 exif_set_long (*d + 6 + offset + 8, data->priv->order,
556 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
558 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
562 memcpy (*d + *ds - data->size, data->data, data->size);
565 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
566 exif_set_short (*d + 6 + offset + 0, data->priv->order,
567 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
568 exif_set_short (*d + 6 + offset + 2, data->priv->order,
570 exif_set_long (*d + 6 + offset + 4, data->priv->order,
572 exif_set_long (*d + 6 + offset + 8, data->priv->order,
582 /* Sort the directory according to TIFF specification */
583 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
584 (ifd->count + n_ptr + n_thumb), 12,
585 data->priv->order == EXIF_BYTE_ORDER_INTEL ? cmp_func_intel : cmp_func_motorola);
587 /* Correctly terminate the directory */
588 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
592 * We are saving IFD 0. Tell where IFD 1 starts and save
595 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
596 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
599 exif_set_long (*d + 6 + offset, data->priv->order, 0);
603 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
604 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
605 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
606 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3
607 } ExifDataTypeMakerNote;
609 static ExifDataTypeMakerNote
610 exif_data_get_type_maker_note (ExifData *d)
615 if (!d) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
617 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
618 if (!e) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
620 /* Olympus & Nikon */
621 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
622 !memcmp (e->data, "Nikon", 5)))
623 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
625 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
626 if (!em) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
629 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
630 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
632 /* Pentax & some variant of Nikon */
633 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
635 exif_entry_get_value (em, value, sizeof(value)),
637 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
639 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
642 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
645 #define LOG_TOO_SMALL \
646 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
647 _("Size of data too small to allow for EXIF data."));
650 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
651 unsigned int ds_orig)
656 const unsigned char *d = d_orig;
657 unsigned int ds = ds_orig, len;
659 if (!data || !data->priv || !d || !ds) return;
661 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
662 "Parsing %i byte(s) EXIF data...\n", ds);
665 * It can be that the data starts with the EXIF header. If it does
666 * not, search the EXIF marker.
672 if (!memcmp (d, ExifHeader, 6)) {
673 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
674 "Found EXIF header.");
677 while ((d[0] == 0xff) && ds) {
682 /* JPEG_MARKER_SOI */
683 if (d[0] == JPEG_MARKER_SOI) {
689 /* JPEG_MARKER_APP0 */
690 if (d[0] == JPEG_MARKER_APP0) {
693 l = (d[0] << 8) | d[1];
701 /* JPEG_MARKER_APP1 */
702 if (d[0] == JPEG_MARKER_APP1)
705 /* Unknown marker or data. Give up. */
706 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
707 "ExifData", _("EXIF marker not found."));
716 len = (d[0] << 8) | d[1];
717 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
718 "We have to deal with %i byte(s) of EXIF data.",
725 * Verify the exif header
726 * (offset 2, length 6).
732 if (memcmp (d, ExifHeader, 6)) {
733 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
734 "ExifData", _("EXIF header not found."));
738 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
739 "Found EXIF header.");
741 /* Byte order (offset 6, length 2) */
744 if (!memcmp (d + 6, "II", 2))
745 data->priv->order = EXIF_BYTE_ORDER_INTEL;
746 else if (!memcmp (d + 6, "MM", 2))
747 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
749 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
750 "ExifData", _("Unknown encoding."));
755 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
759 offset = exif_get_long (d + 10, data->priv->order);
760 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
761 "IFD 0 at %i.", (int) offset);
763 /* Parse the actual exif data (usually offset 14 from start) */
764 exif_data_load_data_content (data, data->ifd[EXIF_IFD_0], d + 6,
768 if (offset + 6 + 2 > ds) {
771 n = exif_get_short (d + 6 + offset, data->priv->order);
772 if (offset + 6 + 2 + 12 * n + 4 > ds) {
775 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
777 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
778 "IFD 1 at %i.", (int) offset);
781 if (offset > ds - 6) {
782 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
783 "ExifData", "Bogus offset.");
787 exif_data_load_data_content (data, data->ifd[EXIF_IFD_1], d + 6,
792 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
793 * cameras use pointers in the maker note tag that point to the
794 * space between IFDs. Here is the only place where we have access
797 switch (exif_data_get_type_maker_note (data)) {
798 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
799 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
801 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
802 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
804 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
805 data->priv->md = exif_mnote_data_canon_new (data->priv->mem);
812 * If we are able to interpret the maker note, do so.
814 if (data->priv->md) {
815 exif_mnote_data_log (data->priv->md, data->priv->log);
816 exif_mnote_data_set_byte_order (data->priv->md,
818 exif_mnote_data_set_offset (data->priv->md,
819 data->priv->offset_mnote);
820 exif_mnote_data_load (data->priv->md, d, ds);
825 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
827 if (!data || !d || !ds)
832 *d = exif_data_alloc (data, *ds);
834 memcpy (*d, ExifHeader, 6);
836 /* Order (offset 6) */
837 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
838 memcpy (*d + 6, "II", 2);
840 memcpy (*d + 6, "MM", 2);
843 /* Fixed value (2 bytes, offset 8) */
844 exif_set_short (*d + 8, data->priv->order, 0x002a);
847 * IFD 0 offset (4 bytes, offset 10).
848 * We will start 8 bytes after the
849 * EXIF header (2 bytes for order, another 2 for the test, and
850 * 4 bytes for the IFD 0 offset make 8 bytes together).
852 exif_set_long (*d + 10, data->priv->order, 8);
854 /* Now save IFD 0. IFD 1 will be saved automatically. */
855 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
857 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
859 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
860 "Saved %i byte(s) EXIF data.", *ds);
864 exif_data_new_from_file (const char *path)
869 loader = exif_loader_new ();
870 exif_loader_write_file (loader, path);
871 edata = exif_loader_get_data (loader);
872 exif_loader_unref (loader);
878 exif_data_ref (ExifData *data)
883 data->priv->ref_count++;
887 exif_data_unref (ExifData *data)
891 data->priv->ref_count--;
892 if (!data->priv->ref_count) exif_data_free (data);
896 exif_data_free (ExifData *data)
899 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
903 for (i = 0; i < EXIF_IFD_COUNT; i++) {
905 exif_content_unref (data->ifd[i]);
911 exif_mem_free (mem, data->data);
916 if (data->priv->log) {
917 exif_log_unref (data->priv->log);
918 data->priv->log = NULL;
920 if (data->priv->md) {
921 exif_mnote_data_unref (data->priv->md);
922 data->priv->md = NULL;
924 exif_mem_free (mem, data->priv);
925 exif_mem_free (mem, data);
928 exif_mem_unref (mem);
932 exif_data_dump (ExifData *data)
939 for (i = 0; i < EXIF_IFD_COUNT; i++) {
940 if (data->ifd[i] && data->ifd[i]->count) {
941 printf ("Dumping IFD '%s'...\n",
942 exif_ifd_get_name (i));
943 exif_content_dump (data->ifd[i], 0);
948 printf ("%i byte(s) thumbnail data available.", data->size);
949 if (data->size >= 4) {
950 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
951 data->data[0], data->data[1],
952 data->data[data->size - 2],
953 data->data[data->size - 1]);
959 exif_data_get_byte_order (ExifData *data)
964 return (data->priv->order);
968 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
976 for (i = 0; i < EXIF_IFD_COUNT; i++)
977 func (data->ifd[i], user_data);
980 typedef struct _ByteOrderChangeData ByteOrderChangeData;
981 struct _ByteOrderChangeData {
982 ExifByteOrder old, new;
986 entry_set_byte_order (ExifEntry *e, void *data)
988 ByteOrderChangeData *d = data;
993 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
997 content_set_byte_order (ExifContent *content, void *data)
999 exif_content_foreach_entry (content, entry_set_byte_order, data);
1003 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1005 ByteOrderChangeData d;
1007 if (!data || (order == data->priv->order))
1010 d.old = data->priv->order;
1012 exif_data_foreach_content (data, content_set_byte_order, &d);
1013 data->priv->order = order;
1015 exif_mnote_data_set_byte_order (data->priv->md, order);
1019 exif_data_log (ExifData *data, ExifLog *log)
1023 if (!data || !data->priv) return;
1024 exif_log_unref (data->priv->log);
1025 data->priv->log = log;
1028 for (i = 0; i < EXIF_IFD_COUNT; i++)
1029 exif_content_log (data->ifd[i], log);
1032 /* Used internally within libexif */
1033 ExifLog *exif_data_get_log (ExifData *);
1035 exif_data_get_log (ExifData *data)
1037 if (!data || !data->priv) return NULL;
1038 return data->priv->log;