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>
31 #include <libexif/olympus/exif-mnote-data-olympus.h>
32 #include <libexif/canon/exif-mnote-data-canon.h>
33 #include <libexif/pentax/exif-mnote-data-pentax.h>
40 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
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;
71 exif_data_alloc (ExifData *data, unsigned int i)
75 if (!data || !i) return NULL;
77 d = exif_mem_alloc (data->priv->mem, i);
80 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
85 exif_data_get_mnote_data (ExifData *d)
87 return (d && d->priv) ? d->priv->md : NULL;
93 ExifMem *mem = exif_mem_new_default ();
94 ExifData *d = exif_data_new_mem (mem);
102 exif_data_new_mem (ExifMem *mem)
107 if (!mem) return NULL;
109 data = exif_mem_alloc (mem, sizeof (ExifData));
110 if (!data) return (NULL);
111 data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
112 if (!data->priv) { exif_mem_free (mem, data); return (NULL); }
113 data->priv->ref_count = 1;
115 data->priv->mem = mem;
118 for (i = 0; i < EXIF_IFD_COUNT; i++) {
119 data->ifd[i] = exif_content_new_mem (data->priv->mem);
121 exif_data_free (data);
124 data->ifd[i]->parent = data;
131 exif_data_new_from_data (const unsigned char *data, unsigned int size)
135 edata = exif_data_new ();
136 exif_data_load_data (edata, data, size);
141 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
142 const unsigned char *d,
143 unsigned int size, unsigned int offset)
145 unsigned int s, doff;
147 entry->tag = exif_get_short (d + offset + 0, data->priv->order);
148 entry->format = exif_get_short (d + offset + 2, data->priv->order);
149 entry->components = exif_get_long (d + offset + 4, data->priv->order);
151 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
152 "Loading entry 0x%x ('%s')...", entry->tag,
153 exif_tag_get_name (entry->tag));
156 * Size? If bigger than 4 bytes, the actual data is not
157 * in the entry but somewhere else (offset).
159 s = exif_format_get_size (entry->format) * entry->components;
163 doff = exif_get_long (d + offset + 8, data->priv->order);
171 entry->data = exif_data_alloc (data, s);
174 memcpy (entry->data, d + doff, s);
177 /* If this is the MakerNote, remember the offset */
178 if (entry->tag == EXIF_TAG_MAKER_NOTE) {
179 if (entry->size > 6) exif_log (data->priv->log,
180 EXIF_LOG_CODE_DEBUG, "ExifData",
181 "MakerNote found (%02x %02x %02x %02x "
182 "%02x %02x %02x...).",
183 entry->data[0], entry->data[1], entry->data[2],
184 entry->data[3], entry->data[4], entry->data[5],
186 data->priv->offset_mnote = doff;
189 exif_entry_fix (entry);
193 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
194 unsigned char **d, unsigned int *ds,
197 unsigned int doff, s;
199 if (!data || !data->priv) return;
202 * Each entry is 12 bytes long. The memory for the entry has
203 * already been allocated.
205 exif_set_short (*d + 6 + offset + 0,
206 data->priv->order, (ExifShort) e->tag);
207 exif_set_short (*d + 6 + offset + 2,
208 data->priv->order, (ExifShort) e->format);
210 #ifndef EXIF_DONT_CHANGE_MAKER_NOTE
211 /* If this is the maker note tag, update it. */
212 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
213 exif_mem_free (data->priv->mem, e->data);
216 exif_mnote_data_set_offset (data->priv->md, *ds - 6);
217 exif_mnote_data_save (data->priv->md, &e->data, &e->size);
218 e->components = e->size;
222 exif_set_long (*d + 6 + offset + 4,
223 data->priv->order, e->components);
226 * Size? If bigger than 4 bytes, the actual data is not in
227 * the entry but somewhere else.
229 s = exif_format_get_size (e->format) * e->components;
235 * According to the TIFF specification,
236 * the offset must be an even number. If we need to introduce
237 * a padding byte, we set it to 0.
240 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
242 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
245 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
246 if (s & 1) *(*d + *ds - 1) = '\0';
251 /* Write the data. Fill unneeded bytes with 0. */
252 memcpy (*d + 6 + doff, e->data, s);
253 if (s < 4) memset (*d + 6 + doff + s, 0, (4 - s));
257 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
258 unsigned int ds, ExifLong offset, ExifLong size)
260 if (ds < offset + size) {
261 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
262 "Bogus thumbnail offset and size: %i < %i + %i.",
263 (int) ds, (int) offset, (int) size);
266 if (data->data) exif_mem_free (data->priv->mem, data->data);
268 data->data = exif_data_alloc (data, data->size);
269 if (!data->data) return;
270 memcpy (data->data, d + offset, data->size);
274 #define CHECK_REC(i) \
275 if (data->ifd[(i)] == ifd) { \
276 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
277 "ExifData", "Recursive entry in IFD " \
278 "'%s' detected. Skipping...", \
279 exif_ifd_get_name (i)); \
282 if (data->ifd[(i)]->count) { \
283 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
284 "ExifData", "Attemt to load IFD " \
285 "'%s' multiple times detected. " \
287 exif_ifd_get_name (i)); \
292 exif_data_load_data_content (ExifData *data, ExifContent *ifd,
293 const unsigned char *d,
294 unsigned int ds, unsigned int offset)
296 ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
302 if (!data || !data->priv) return;
304 /* Read the number of entries */
305 if (offset >= ds - 1) return;
306 n = exif_get_short (d + offset, data->priv->order);
307 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
308 "Loading %i entries...", n);
311 /* Check if we have enough data. */
312 if (offset + 12 * n > ds) n = (ds - offset) / 12;
314 for (i = 0; i < n; i++) {
316 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
318 case EXIF_TAG_EXIF_IFD_POINTER:
319 case EXIF_TAG_GPS_INFO_IFD_POINTER:
320 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
321 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
322 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
323 o = exif_get_long (d + offset + 12 * i + 8,
326 case EXIF_TAG_EXIF_IFD_POINTER:
327 CHECK_REC (EXIF_IFD_EXIF);
328 exif_data_load_data_content (data,
329 data->ifd[EXIF_IFD_EXIF], d, ds, o);
331 case EXIF_TAG_GPS_INFO_IFD_POINTER:
332 CHECK_REC (EXIF_IFD_GPS);
333 exif_data_load_data_content (data,
334 data->ifd[EXIF_IFD_GPS], d, ds, o);
336 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
337 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
338 exif_data_load_data_content (data,
339 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds, o);
341 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
342 thumbnail_offset = o;
343 if (thumbnail_offset && thumbnail_length)
344 exif_data_load_data_thumbnail (data, d,
345 ds, thumbnail_offset,
348 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
349 thumbnail_length = o;
350 if (thumbnail_offset && thumbnail_length)
351 exif_data_load_data_thumbnail (data, d,
352 ds, thumbnail_offset,
362 * If we don't know the tag, chances are high
363 * that the EXIF data does not follow the standard.
365 if (!exif_tag_get_name (tag)) {
366 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
367 "Unknown tag %x (entry %i)", tag, i);
370 entry = exif_entry_new_mem (data->priv->mem);
371 exif_data_load_data_entry (data, entry, d, ds,
373 exif_content_add_entry (ifd, entry);
374 exif_entry_unref (entry);
381 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
383 ExifShort tag1 = exif_get_short (p1, o);
384 ExifShort tag2 = exif_get_short (p2, o);
386 return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
390 cmp_func_intel (const void *elem1, const void *elem2)
392 return cmp_func ((const unsigned char *) elem1,
393 (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
397 cmp_func_motorola (const void *elem1, const void *elem2)
399 return cmp_func ((const unsigned char *) elem1,
400 (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
404 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
405 unsigned char **d, unsigned int *ds,
408 unsigned int j, n_ptr = 0, n_thumb = 0;
411 if (!data || !data->priv || !ifd || !d || !ds) return;
413 for (i = 0; i < EXIF_IFD_COUNT; i++)
414 if (ifd == data->ifd[i])
416 if (i == EXIF_IFD_COUNT)
420 * Check if we need some extra entries for pointers or the thumbnail.
426 * The pointer to IFD_EXIF is in IFD_0. The pointer to
427 * IFD_INTEROPERABILITY is in IFD_EXIF.
429 if (data->ifd[EXIF_IFD_EXIF]->count ||
430 data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
433 /* The pointer to IFD_GPS is in IFD_0. */
434 if (data->ifd[EXIF_IFD_GPS]->count)
443 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
450 * Allocate enough memory for all entries
451 * and the number of entries.
453 *ds += (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
454 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
456 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", *ds);
460 /* Save the number of entries */
461 exif_set_short (*d + 6 + offset, data->priv->order,
462 (ExifShort) (ifd->count + n_ptr + n_thumb));
465 /* Save each entry */
466 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
467 "Saving %i entries (IFD '%s', offset: %i)...",
468 ifd->count, exif_ifd_get_name (i), offset);
469 for (j = 0; j < ifd->count; j++)
470 exif_data_save_data_entry (data, ifd->entries[j], d, ds, offset + 12 * j);
472 offset += 12 * ifd->count;
474 /* Now save special entries. */
479 * The pointer to IFD_EXIF is in IFD_0.
480 * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
481 * therefore, if IFD_INTEROPERABILITY is not empty, we need
482 * IFD_EXIF even if latter is empty.
484 if (data->ifd[EXIF_IFD_EXIF]->count ||
485 data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
486 exif_set_short (*d + 6 + offset + 0, data->priv->order,
487 EXIF_TAG_EXIF_IFD_POINTER);
488 exif_set_short (*d + 6 + offset + 2, data->priv->order,
490 exif_set_long (*d + 6 + offset + 4, data->priv->order,
492 exif_set_long (*d + 6 + offset + 8, data->priv->order,
494 exif_data_save_data_content (data,
495 data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
499 /* The pointer to IFD_GPS is in IFD_0, too. */
500 if (data->ifd[EXIF_IFD_GPS]->count) {
501 exif_set_short (*d + 6 + offset + 0, data->priv->order,
502 EXIF_TAG_GPS_INFO_IFD_POINTER);
503 exif_set_short (*d + 6 + offset + 2, data->priv->order,
505 exif_set_long (*d + 6 + offset + 4, data->priv->order,
507 exif_set_long (*d + 6 + offset + 8, data->priv->order,
509 exif_data_save_data_content (data,
510 data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
518 * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
521 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
522 exif_set_short (*d + 6 + offset + 0, data->priv->order,
523 EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
524 exif_set_short (*d + 6 + offset + 2, data->priv->order,
526 exif_set_long (*d + 6 + offset + 4, data->priv->order,
528 exif_set_long (*d + 6 + offset + 8, data->priv->order,
530 exif_data_save_data_content (data,
531 data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
540 * Information about the thumbnail (if any) is saved in
545 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
546 exif_set_short (*d + 6 + offset + 0, data->priv->order,
547 EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
548 exif_set_short (*d + 6 + offset + 2, data->priv->order,
550 exif_set_long (*d + 6 + offset + 4, data->priv->order,
552 exif_set_long (*d + 6 + offset + 8, data->priv->order,
555 *d = exif_mem_realloc (data->priv->mem, *d, *ds);
557 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
561 memcpy (*d + *ds - data->size, data->data, data->size);
564 /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
565 exif_set_short (*d + 6 + offset + 0, data->priv->order,
566 EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
567 exif_set_short (*d + 6 + offset + 2, data->priv->order,
569 exif_set_long (*d + 6 + offset + 4, data->priv->order,
571 exif_set_long (*d + 6 + offset + 8, data->priv->order,
581 /* Sort the directory according to TIFF specification */
582 qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
583 (ifd->count + n_ptr + n_thumb), 12,
584 data->priv->order == EXIF_BYTE_ORDER_INTEL ? cmp_func_intel : cmp_func_motorola);
586 /* Correctly terminate the directory */
587 if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
591 * We are saving IFD 0. Tell where IFD 1 starts and save
594 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
595 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
598 exif_set_long (*d + 6 + offset, data->priv->order, 0);
602 EXIF_DATA_TYPE_MAKER_NOTE_NONE = 0,
603 EXIF_DATA_TYPE_MAKER_NOTE_CANON = 1,
604 EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS = 2,
605 EXIF_DATA_TYPE_MAKER_NOTE_PENTAX = 3
606 } ExifDataTypeMakerNote;
608 static ExifDataTypeMakerNote
609 exif_data_get_type_maker_note (ExifData *d)
614 if (!d) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
616 e = exif_data_get_entry (d, EXIF_TAG_MAKER_NOTE);
617 if (!e) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
619 /* Olympus & Nikon */
620 if ((e->size >= 5) && (!memcmp (e->data, "OLYMP", 5) ||
621 !memcmp (e->data, "Nikon", 5)))
622 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
624 em = exif_data_get_entry (d, EXIF_TAG_MAKE);
625 if (!em) return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
628 if (!strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"))
629 return EXIF_DATA_TYPE_MAKER_NOTE_CANON;
631 /* Pentax & some variant of Nikon */
632 if ((e->size >= 2) && (e->data[0] == 0x00) && (e->data[1] == 0x1b)) {
634 exif_entry_get_value (em, value, sizeof(value)),
636 return EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS;
638 return EXIF_DATA_TYPE_MAKER_NOTE_PENTAX;
641 return EXIF_DATA_TYPE_MAKER_NOTE_NONE;
645 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
646 unsigned int ds_orig)
651 const unsigned char *d = d_orig;
652 unsigned int ds = ds_orig, len;
654 if (!data || !data->priv || !d || !ds) return;
656 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
657 "Parsing %i byte(s) EXIF data...\n", ds);
660 * It can be that the data starts with the EXIF header. If it does
661 * not, search the EXIF marker.
664 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
668 if (!memcmp (d, ExifHeader, 6)) {
669 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
670 "Found EXIF header.");
673 while ((d[0] == 0xff) && ds) {
678 /* JPEG_MARKER_SOI */
679 if (d[0] == JPEG_MARKER_SOI) {
685 /* JPEG_MARKER_APP0 */
686 if (d[0] == JPEG_MARKER_APP0) {
689 l = (d[0] << 8) | d[1];
697 /* JPEG_MARKER_APP1 */
698 if (d[0] == JPEG_MARKER_APP1)
701 /* Unknown marker or data. Give up. */
702 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
703 "ExifData", "EXIF marker not found.");
709 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
710 "ExifData", "Size too small.");
713 len = (d[0] << 8) | d[1];
714 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
715 "We have to deal with %i byte(s) of EXIF data.",
722 * Verify the exif header
723 * (offset 2, length 6).
726 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
730 if (memcmp (d, ExifHeader, 6)) {
731 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
732 "EXIF header not found.");
736 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
737 "Found EXIF header.");
739 /* Byte order (offset 6, length 2) */
742 if (!memcmp (d + 6, "II", 2))
743 data->priv->order = EXIF_BYTE_ORDER_INTEL;
744 else if (!memcmp (d + 6, "MM", 2))
745 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
750 if (exif_get_short (d + 8, data->priv->order) != 0x002a)
754 offset = exif_get_long (d + 10, data->priv->order);
755 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
756 "IFD 0 at %i.", (int) offset);
758 /* Parse the actual exif data (usually offset 14 from start) */
759 exif_data_load_data_content (data, data->ifd[EXIF_IFD_0], d + 6,
763 if (offset + 6 + 2 > ds) {
766 n = exif_get_short (d + 6 + offset, data->priv->order);
767 if (offset + 6 + 2 + 12 * n + 4 > ds) {
770 offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
772 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
773 "IFD 1 at %i.", (int) offset);
776 if (offset > ds - 6) {
777 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
778 "ExifData", "Bogus offset!");
782 exif_data_load_data_content (data, data->ifd[EXIF_IFD_1], d + 6,
787 * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
788 * cameras use pointers in the maker note tag that point to the
789 * space between IFDs. Here is the only place where we have access
792 switch (exif_data_get_type_maker_note (data)) {
793 case EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS:
794 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
796 case EXIF_DATA_TYPE_MAKER_NOTE_PENTAX:
797 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
799 case EXIF_DATA_TYPE_MAKER_NOTE_CANON:
800 data->priv->md = exif_mnote_data_canon_new (data->priv->mem);
807 * If we are able to interpret the maker note, do so.
809 if (data->priv->md) {
810 exif_mnote_data_log (data->priv->md, data->priv->log);
811 exif_mnote_data_set_byte_order (data->priv->md,
813 exif_mnote_data_set_offset (data->priv->md,
814 data->priv->offset_mnote);
815 exif_mnote_data_load (data->priv->md, d, ds);
820 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
822 if (!data || !d || !ds)
827 *d = exif_data_alloc (data, *ds);
829 memcpy (*d, ExifHeader, 6);
831 /* Order (offset 6) */
832 if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
833 memcpy (*d + 6, "II", 2);
835 memcpy (*d + 6, "MM", 2);
838 /* Fixed value (2 bytes, offset 8) */
839 exif_set_short (*d + 8, data->priv->order, 0x002a);
842 * IFD 0 offset (4 bytes, offset 10).
843 * We will start 8 bytes after the
844 * EXIF header (2 bytes for order, another 2 for the test, and
845 * 4 bytes for the IFD 0 offset make 8 bytes together).
847 exif_set_long (*d + 10, data->priv->order, 8);
849 /* Now save IFD 0. IFD 1 will be saved automatically. */
850 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
852 exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
854 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
855 "Saved %i byte(s) EXIF data.", *ds);
859 exif_data_new_from_file (const char *path)
864 loader = exif_loader_new ();
865 exif_loader_write_file (loader, path);
866 edata = exif_loader_get_data (loader);
867 exif_loader_unref (loader);
873 exif_data_ref (ExifData *data)
878 data->priv->ref_count++;
882 exif_data_unref (ExifData *data)
886 data->priv->ref_count--;
887 if (!data->priv->ref_count) exif_data_free (data);
891 exif_data_free (ExifData *data)
894 ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
898 for (i = 0; i < EXIF_IFD_COUNT; i++) {
900 exif_content_unref (data->ifd[i]);
906 exif_mem_free (mem, data->data);
911 if (data->priv->log) {
912 exif_log_unref (data->priv->log);
913 data->priv->log = NULL;
915 if (data->priv->md) {
916 exif_mnote_data_unref (data->priv->md);
917 data->priv->md = NULL;
919 exif_mem_free (mem, data->priv);
920 exif_mem_free (mem, data);
923 exif_mem_unref (mem);
927 exif_data_dump (ExifData *data)
934 for (i = 0; i < EXIF_IFD_COUNT; i++) {
935 if (data->ifd[i] && data->ifd[i]->count) {
936 printf ("Dumping IFD '%s'...\n",
937 exif_ifd_get_name (i));
938 exif_content_dump (data->ifd[i], 0);
943 printf ("%i byte(s) thumbnail data available.", data->size);
944 if (data->size >= 4) {
945 printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
946 data->data[0], data->data[1],
947 data->data[data->size - 2],
948 data->data[data->size - 1]);
954 exif_data_get_byte_order (ExifData *data)
959 return (data->priv->order);
963 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
971 for (i = 0; i < EXIF_IFD_COUNT; i++)
972 func (data->ifd[i], user_data);
975 typedef struct _ByteOrderChangeData ByteOrderChangeData;
976 struct _ByteOrderChangeData {
977 ExifByteOrder old, new;
981 entry_set_byte_order (ExifEntry *e, void *data)
983 ByteOrderChangeData *d = data;
988 exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
992 content_set_byte_order (ExifContent *content, void *data)
994 exif_content_foreach_entry (content, entry_set_byte_order, data);
998 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
1000 ByteOrderChangeData d;
1002 if (!data || (order == data->priv->order))
1005 d.old = data->priv->order;
1007 exif_data_foreach_content (data, content_set_byte_order, &d);
1008 data->priv->order = order;
1010 exif_mnote_data_set_byte_order (data->priv->md, order);
1014 exif_data_log (ExifData *data, ExifLog *log)
1018 if (!data || !data->priv) return;
1019 exif_log_unref (data->priv->log);
1020 data->priv->log = log;
1023 for (i = 0; i < EXIF_IFD_COUNT; i++)
1024 exif_content_log (data->ifd[i], log);
1027 /* Used internally within libexif */
1028 ExifLog *exif_data_get_log (ExifData *);
1030 exif_data_get_log (ExifData *data)
1032 if (!data || !data->priv) return NULL;
1033 return data->priv->log;