1 /* exif-mnote-data-olympus.c
2 *
3 * Copyright (c) 2002, 2003 Lutz Mueller <lutz@users.sourceforge.net>
4 *
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.
9 *
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.
14 *
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., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301 USA.
19 */
20
21 #include <config.h>
22 #include "exif-mnote-data-olympus.h"
23
24 #include <stdlib.h>
25 #include <string.h>
26 #include <stdio.h>
27
28 #include <libexif/exif-utils.h>
29 #include <libexif/exif-data.h>
30
31 #define DEBUG
32
33 /* Uncomment this to fix a problem with Sanyo MakerNotes. It's probably best
34 * not to in most cases because it seems to only affect the thumbnail tag
35 * which is duplicated in IFD 1, and fixing the offset could actually cause
36 * problems with other software that expects the broken form.
37 */
38 /*#define EXIF_OVERCOME_SANYO_OFFSET_BUG */
39
40 static enum OlympusVersion
41 exif_mnote_data_olympus_identify_variant (const unsigned char *buf,
42 unsigned int buf_size);
43
44
45 static void
exif_mnote_data_olympus_clear(ExifMnoteDataOlympus * n)46 exif_mnote_data_olympus_clear (ExifMnoteDataOlympus *n)
47 {
48 ExifMnoteData *d = (ExifMnoteData *) n;
49 unsigned int i;
50
51 if (!n) return;
52
53 if (n->entries) {
54 for (i = 0; i < n->count; i++)
55 if (n->entries[i].data) {
56 exif_mem_free (d->mem, n->entries[i].data);
57 n->entries[i].data = NULL;
58 }
59 exif_mem_free (d->mem, n->entries);
60 n->entries = NULL;
61 n->count = 0;
62 }
63 }
64
65 static void
exif_mnote_data_olympus_free(ExifMnoteData * n)66 exif_mnote_data_olympus_free (ExifMnoteData *n)
67 {
68 if (!n) return;
69
70 exif_mnote_data_olympus_clear ((ExifMnoteDataOlympus *) n);
71 }
72
73 static char *
exif_mnote_data_olympus_get_value(ExifMnoteData * d,unsigned int i,char * val,unsigned int maxlen)74 exif_mnote_data_olympus_get_value (ExifMnoteData *d, unsigned int i, char *val, unsigned int maxlen)
75 {
76 ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d;
77
78 if (!d || !val) return NULL;
79 if (i > n->count -1) return NULL;
80 /*
81 exif_log (d->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
82 "Querying value for tag '%s'...",
83 mnote_olympus_tag_get_name (n->entries[i].tag));
84 */
85 return mnote_olympus_entry_get_value (&n->entries[i], val, maxlen);
86 }
87
88
89
90
91 /**
92 * @brief save the MnoteData from ne to buf
93 *
94 * @param ne extract the data from this structure
95 * @param *buf write the mnoteData to this buffer (buffer will be allocated)
96 * @param buf_size the size of the buffer
97 */
98 static void
exif_mnote_data_olympus_save(ExifMnoteData * ne,unsigned char ** buf,unsigned int * buf_size)99 exif_mnote_data_olympus_save (ExifMnoteData *ne,
100 unsigned char **buf, unsigned int *buf_size)
101 {
102 ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) ne;
103 size_t i, o, s, doff, base = 0, o2 = 6 + 2;
104 size_t datao = 0;
105 unsigned char *t;
106 size_t ts;
107
108 if (!n || !buf || !buf_size) return;
109
110 /*
111 * Allocate enough memory for all entries and the number of entries.
112 */
113 *buf_size = 6 + 2 + 2 + n->count * 12;
114 switch (n->version) {
115 case olympusV1:
116 case sanyoV1:
117 case epsonV1:
118 *buf = exif_mem_alloc (ne->mem, *buf_size);
119 if (!*buf) {
120 EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataOlympus", *buf_size);
121 return;
122 }
123
124 /* Write the header and the number of entries. */
125 strcpy ((char *)*buf, n->version==sanyoV1?"SANYO":
126 (n->version==epsonV1?"EPSON":"OLYMP"));
127 exif_set_short (*buf + 6, n->order, (ExifShort) 1);
128 datao = n->offset;
129 break;
130
131 case olympusV2:
132 *buf_size += 8-6 + 4;
133 *buf = exif_mem_alloc (ne->mem, *buf_size);
134 if (!*buf) {
135 EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataOlympus", *buf_size);
136 return;
137 }
138
139 /* Write the header and the number of entries. */
140 strcpy ((char *)*buf, "OLYMPUS");
141 exif_set_short (*buf + 8, n->order, (ExifShort) (
142 (n->order == EXIF_BYTE_ORDER_INTEL) ?
143 ('I' << 8) | 'I' :
144 ('M' << 8) | 'M'));
145 exif_set_short (*buf + 10, n->order, (ExifShort) 3);
146 o2 += 4;
147 break;
148
149 case nikonV1:
150 base = MNOTE_NIKON1_TAG_BASE;
151
152 /* v1 has offsets based to main IFD, not makernote IFD */
153 datao += n->offset + 10;
154 /* subtract the size here, so the increment in the next case will not harm us */
155 *buf_size -= 8 + 2;
156 /* Fall through to nikonV2 handler */
157 case nikonV2:
158 /* Write out V0 files in V2 format */
159 case nikonV0:
160 *buf_size += 8 + 2;
161 *buf_size += 4; /* Next IFD pointer */
162 *buf = exif_mem_alloc (ne->mem, *buf_size);
163 if (!*buf) {
164 EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataOlympus", *buf_size);
165 return;
166 }
167
168 /* Write the header and the number of entries. */
169 strcpy ((char *)*buf, "Nikon");
170 (*buf)[6] = n->version;
171
172 if (n->version != nikonV1) {
173 exif_set_short (*buf + 10, n->order, (ExifShort) (
174 (n->order == EXIF_BYTE_ORDER_INTEL) ?
175 ('I' << 8) | 'I' :
176 ('M' << 8) | 'M'));
177 exif_set_short (*buf + 12, n->order, (ExifShort) 0x2A);
178 exif_set_long (*buf + 14, n->order, (ExifShort) 8);
179 o2 += 2 + 8;
180 }
181 datao -= 10;
182 /* Reset next IFD pointer */
183 exif_set_long (*buf + o2 + 2 + n->count * 12, n->order, 0);
184 break;
185
186 default:
187 return;
188 }
189
190 exif_set_short (*buf + o2, n->order, (ExifShort) n->count);
191 o2 += 2;
192
193 /* Save each entry */
194 for (i = 0; i < n->count; i++) {
195 o = o2 + i * 12;
196 exif_set_short (*buf + o + 0, n->order,
197 (ExifShort) (n->entries[i].tag - base));
198 exif_set_short (*buf + o + 2, n->order,
199 (ExifShort) n->entries[i].format);
200 exif_set_long (*buf + o + 4, n->order,
201 n->entries[i].components);
202 o += 8;
203 s = exif_format_get_size (n->entries[i].format) *
204 n->entries[i].components;
205 if (s > 65536) {
206 /* Corrupt data: EXIF data size is limited to the
207 * maximum size of a JPEG segment (64 kb).
208 */
209 continue;
210 }
211 if (s > 4) {
212 doff = *buf_size;
213 ts = *buf_size + s;
214 t = exif_mem_realloc (ne->mem, *buf,
215 sizeof (char) * ts);
216 if (!t) {
217 EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteDataOlympus", ts);
218 return;
219 }
220 *buf = t;
221 *buf_size = ts;
222 exif_set_long (*buf + o, n->order, datao + doff);
223 } else
224 doff = o;
225
226 /* Write the data. */
227 if (n->entries[i].data) {
228 memcpy (*buf + doff, n->entries[i].data, s);
229 } else {
230 /* Most certainly damaged input file */
231 memset (*buf + doff, 0, s);
232 }
233 }
234 }
235
236 static void
exif_mnote_data_olympus_load(ExifMnoteData * en,const unsigned char * buf,unsigned int buf_size)237 exif_mnote_data_olympus_load (ExifMnoteData *en,
238 const unsigned char *buf, unsigned int buf_size)
239 {
240 ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) en;
241 ExifShort c;
242 size_t i, tcount, o, o2, datao = 6, base = 0;
243
244 if (!n || !buf || !buf_size) {
245 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
246 "ExifMnoteDataOlympus", "Short MakerNote");
247 return;
248 }
249 o2 = 6 + n->offset; /* Start of interesting data */
250 if ((o2 + 10 < o2) || (o2 + 10 < 10) || (o2 + 10 > buf_size)) {
251 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
252 "ExifMnoteDataOlympus", "Short MakerNote");
253 return;
254 }
255
256 /*
257 * Olympus headers start with "OLYMP" and need to have at least
258 * a size of 22 bytes (6 for 'OLYMP', 2 other bytes, 2 for the
259 * number of entries, and 12 for one entry.
260 *
261 * Sanyo format is identical and uses identical tags except that
262 * header starts with "SANYO".
263 *
264 * Epson format is identical and uses identical tags except that
265 * header starts with "EPSON".
266 *
267 * Nikon headers start with "Nikon" (6 bytes including '\0'),
268 * version number (1 or 2).
269 *
270 * Version 1 continues with 0, 1, 0, number_of_tags,
271 * or just with number_of_tags (models D1H, D1X...).
272 *
273 * Version 2 continues with an unknown byte (0 or 10),
274 * two unknown bytes (0), "MM" or "II", another byte 0 and
275 * lastly 0x2A.
276 */
277 n->version = exif_mnote_data_olympus_identify_variant(buf+o2, buf_size-o2);
278 switch (n->version) {
279 case olympusV1:
280 case sanyoV1:
281 case epsonV1:
282 exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
283 "Parsing Olympus/Sanyo/Epson maker note v1...");
284
285 /* The number of entries is at position 8. */
286 if (buf[o2 + 6] == 1)
287 n->order = EXIF_BYTE_ORDER_INTEL;
288 else if (buf[o2 + 6 + 1] == 1)
289 n->order = EXIF_BYTE_ORDER_MOTOROLA;
290 o2 += 8;
291 if (o2 + 2 > buf_size) return;
292 c = exif_get_short (buf + o2, n->order);
293 if ((!(c & 0xFF)) && (c > 0x500)) {
294 if (n->order == EXIF_BYTE_ORDER_INTEL) {
295 n->order = EXIF_BYTE_ORDER_MOTOROLA;
296 } else {
297 n->order = EXIF_BYTE_ORDER_INTEL;
298 }
299 }
300 break;
301
302 case olympusV2:
303 /* Olympus S760, S770 */
304 datao = o2;
305 o2 += 8;
306 exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
307 "Parsing Olympus maker note v2 (0x%02x, %02x, %02x, %02x)...",
308 buf[o2], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3]);
309
310 if ((buf[o2] == 'I') && (buf[o2 + 1] == 'I'))
311 n->order = EXIF_BYTE_ORDER_INTEL;
312 else if ((buf[o2] == 'M') && (buf[o2 + 1] == 'M'))
313 n->order = EXIF_BYTE_ORDER_MOTOROLA;
314
315 /* The number of entries is at position 8+4. */
316 o2 += 4;
317 break;
318
319 case nikonV1:
320 o2 += 6;
321 if (o2 >= buf_size) return;
322 exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
323 "Parsing Nikon maker note v1 (0x%02x, %02x, %02x, "
324 "%02x, %02x, %02x, %02x, %02x)...",
325 buf[o2 + 0], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3],
326 buf[o2 + 4], buf[o2 + 5], buf[o2 + 6], buf[o2 + 7]);
327
328 /* Skip version number */
329 o2 += 1;
330
331 /* Skip an unknown byte (00 or 0A). */
332 o2 += 1;
333
334 base = MNOTE_NIKON1_TAG_BASE;
335 /* Fix endianness, if needed */
336 if (o2 + 2 > buf_size) return;
337 c = exif_get_short (buf + o2, n->order);
338 if ((!(c & 0xFF)) && (c > 0x500)) {
339 if (n->order == EXIF_BYTE_ORDER_INTEL) {
340 n->order = EXIF_BYTE_ORDER_MOTOROLA;
341 } else {
342 n->order = EXIF_BYTE_ORDER_INTEL;
343 }
344 }
345 break;
346
347 case nikonV2:
348 o2 += 6;
349 if (o2 >= buf_size) return;
350 exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
351 "Parsing Nikon maker note v2 (0x%02x, %02x, %02x, "
352 "%02x, %02x, %02x, %02x, %02x)...",
353 buf[o2 + 0], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3],
354 buf[o2 + 4], buf[o2 + 5], buf[o2 + 6], buf[o2 + 7]);
355
356 /* Skip version number */
357 o2 += 1;
358
359 /* Skip an unknown byte (00 or 0A). */
360 o2 += 1;
361
362 /* Skip 2 unknown bytes (00 00). */
363 o2 += 2;
364
365 /*
366 * Byte order. From here the data offset
367 * gets calculated.
368 */
369 datao = o2;
370 if (o2 >= buf_size) return;
371 if (!strncmp ((char *)&buf[o2], "II", 2))
372 n->order = EXIF_BYTE_ORDER_INTEL;
373 else if (!strncmp ((char *)&buf[o2], "MM", 2))
374 n->order = EXIF_BYTE_ORDER_MOTOROLA;
375 else {
376 exif_log (en->log, EXIF_LOG_CODE_DEBUG,
377 "ExifMnoteDataOlympus", "Unknown "
378 "byte order '%c%c'", buf[o2],
379 buf[o2 + 1]);
380 return;
381 }
382 o2 += 2;
383
384 /* Skip 2 unknown bytes (00 2A). */
385 o2 += 2;
386
387 /* Go to where the number of entries is. */
388 if (o2 + 4 > buf_size) return;
389 o2 = datao + exif_get_long (buf + o2, n->order);
390 break;
391
392 case nikonV0:
393 exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
394 "Parsing Nikon maker note v0 (0x%02x, %02x, %02x, "
395 "%02x, %02x, %02x, %02x, %02x)...",
396 buf[o2 + 0], buf[o2 + 1], buf[o2 + 2], buf[o2 + 3],
397 buf[o2 + 4], buf[o2 + 5], buf[o2 + 6], buf[o2 + 7]);
398 /* 00 1b is # of entries in Motorola order - the rest should also be in MM order */
399 n->order = EXIF_BYTE_ORDER_MOTOROLA;
400 break;
401
402 default:
403 exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataOlympus",
404 "Unknown Olympus variant %i.", n->version);
405 return;
406 }
407
408 /* Sanity check the offset */
409 if ((o2 + 2 < o2) || (o2 + 2 < 2) || (o2 + 2 > buf_size)) {
410 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
411 "ExifMnoteOlympus", "Short MakerNote");
412 return;
413 }
414
415 /* Read the number of tags */
416 c = exif_get_short (buf + o2, n->order);
417 o2 += 2;
418
419 /* Remove any old entries */
420 exif_mnote_data_olympus_clear (n);
421
422 /* Reserve enough space for all the possible MakerNote tags */
423 n->entries = exif_mem_alloc (en->mem, sizeof (MnoteOlympusEntry) * c);
424 if (!n->entries) {
425 EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteOlympus", sizeof (MnoteOlympusEntry) * c);
426 return;
427 }
428
429 /* Parse all c entries, storing ones that are successfully parsed */
430 tcount = 0;
431 for (i = c, o = o2; i; --i, o += 12) {
432 size_t s;
433 if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) {
434 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA,
435 "ExifMnoteOlympus", "Short MakerNote");
436 break;
437 }
438
439 n->entries[tcount].tag = exif_get_short (buf + o, n->order) + base;
440 n->entries[tcount].format = exif_get_short (buf + o + 2, n->order);
441 n->entries[tcount].components = exif_get_long (buf + o + 4, n->order);
442 n->entries[tcount].order = n->order;
443
444 exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteOlympus",
445 "Loading entry 0x%x ('%s')...", n->entries[tcount].tag,
446 mnote_olympus_tag_get_name (n->entries[tcount].tag));
447 /* exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteOlympus",
448 "0x%x %d %ld*(%d)",
449 n->entries[tcount].tag,
450 n->entries[tcount].format,
451 n->entries[tcount].components,
452 (int)exif_format_get_size(n->entries[tcount].format)); */
453
454 /*
455 * Size? If bigger than 4 bytes, the actual data is not
456 * in the entry but somewhere else (offset).
457 */
458 s = exif_format_get_size (n->entries[tcount].format) *
459 n->entries[tcount].components;
460 n->entries[tcount].size = s;
461 if (s) {
462 size_t dataofs = o + 8;
463 if (s > 4) {
464 /* The data in this case is merely a pointer */
465 dataofs = exif_get_long (buf + dataofs, n->order) + datao;
466 #ifdef EXIF_OVERCOME_SANYO_OFFSET_BUG
467 /* Some Sanyo models (e.g. VPC-C5, C40) suffer from a bug when
468 * writing the offset for the MNOTE_OLYMPUS_TAG_THUMBNAILIMAGE
469 * tag in its MakerNote. The offset is actually the absolute
470 * position in the file instead of the position within the IFD.
471 */
472 if (dataofs + s > buf_size && n->version == sanyoV1) {
473 /* fix pointer */
474 dataofs -= datao + 6;
475 exif_log (en->log, EXIF_LOG_CODE_DEBUG,
476 "ExifMnoteOlympus",
477 "Inconsistent thumbnail tag offset; attempting to recover");
478 }
479 #endif
480 }
481 if ((dataofs + s < dataofs) || (dataofs + s < s) ||
482 (dataofs + s > buf_size)) {
483 exif_log (en->log, EXIF_LOG_CODE_DEBUG,
484 "ExifMnoteOlympus",
485 "Tag data past end of buffer (%zu > %u)",
486 dataofs + s, buf_size);
487 continue;
488 }
489
490 n->entries[tcount].data = exif_mem_alloc (en->mem, s);
491 if (!n->entries[tcount].data) {
492 EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteOlympus", s);
493 continue;
494 }
495 memcpy (n->entries[tcount].data, buf + dataofs, s);
496 }
497
498 /* Tag was successfully parsed */
499 ++tcount;
500 }
501 /* Store the count of successfully parsed tags */
502 n->count = tcount;
503 }
504
505 static unsigned int
exif_mnote_data_olympus_count(ExifMnoteData * n)506 exif_mnote_data_olympus_count (ExifMnoteData *n)
507 {
508 return n ? ((ExifMnoteDataOlympus *) n)->count : 0;
509 }
510
511 static unsigned int
exif_mnote_data_olympus_get_id(ExifMnoteData * d,unsigned int n)512 exif_mnote_data_olympus_get_id (ExifMnoteData *d, unsigned int n)
513 {
514 ExifMnoteDataOlympus *note = (ExifMnoteDataOlympus *) d;
515
516 if (!note) return 0;
517 if (note->count <= n) return 0;
518 return note->entries[n].tag;
519 }
520
521 static const char *
exif_mnote_data_olympus_get_name(ExifMnoteData * d,unsigned int i)522 exif_mnote_data_olympus_get_name (ExifMnoteData *d, unsigned int i)
523 {
524 ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d;
525
526 if (!n) return NULL;
527 if (i >= n->count) return NULL;
528 return mnote_olympus_tag_get_name (n->entries[i].tag);
529 }
530
531 static const char *
exif_mnote_data_olympus_get_title(ExifMnoteData * d,unsigned int i)532 exif_mnote_data_olympus_get_title (ExifMnoteData *d, unsigned int i)
533 {
534 ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d;
535
536 if (!n) return NULL;
537 if (i >= n->count) return NULL;
538 return mnote_olympus_tag_get_title (n->entries[i].tag);
539 }
540
541 static const char *
exif_mnote_data_olympus_get_description(ExifMnoteData * d,unsigned int i)542 exif_mnote_data_olympus_get_description (ExifMnoteData *d, unsigned int i)
543 {
544 ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d;
545
546 if (!n) return NULL;
547 if (i >= n->count) return NULL;
548 return mnote_olympus_tag_get_description (n->entries[i].tag);
549 }
550
551 static void
exif_mnote_data_olympus_set_byte_order(ExifMnoteData * d,ExifByteOrder o)552 exif_mnote_data_olympus_set_byte_order (ExifMnoteData *d, ExifByteOrder o)
553 {
554 ExifByteOrder o_orig;
555 ExifMnoteDataOlympus *n = (ExifMnoteDataOlympus *) d;
556 unsigned int i;
557
558 if (!n) return;
559
560 o_orig = n->order;
561 n->order = o;
562 for (i = 0; i < n->count; i++) {
563 n->entries[i].order = o;
564 exif_array_set_byte_order (n->entries[i].format, n->entries[i].data,
565 n->entries[i].components, o_orig, o);
566 }
567 }
568
569 static void
exif_mnote_data_olympus_set_offset(ExifMnoteData * n,unsigned int o)570 exif_mnote_data_olympus_set_offset (ExifMnoteData *n, unsigned int o)
571 {
572 if (n) ((ExifMnoteDataOlympus *) n)->offset = o;
573 }
574
575 static enum OlympusVersion
exif_mnote_data_olympus_identify_variant(const unsigned char * buf,unsigned int buf_size)576 exif_mnote_data_olympus_identify_variant (const unsigned char *buf,
577 unsigned int buf_size)
578 {
579 /* Olympus, Nikon, Sanyo, Epson */
580 if (buf_size >= 8) {
581 /* Match the terminating NUL character, too */
582 if (!memcmp (buf, "OLYMPUS", 8))
583 return olympusV2;
584 else if (!memcmp (buf, "OLYMP", 6))
585 return olympusV1;
586 else if (!memcmp (buf, "SANYO", 6))
587 return sanyoV1;
588 else if (!memcmp (buf, "EPSON", 6))
589 return epsonV1;
590 else if (!memcmp (buf, "Nikon", 6)) {
591 switch (buf[6]) {
592 case 1: return nikonV1;
593 case 2: return nikonV2;
594 default: return 0; /* Unrecognized Nikon variant */
595 }
596 }
597 }
598
599 /* Another variant of Nikon */
600 if ((buf_size >= 2) && (buf[0] == 0x00) && (buf[1] == 0x1b)) {
601 return nikonV0;
602 }
603
604 return unrecognized;
605 }
606
607 int
exif_mnote_data_olympus_identify(const ExifData * ed,const ExifEntry * e)608 exif_mnote_data_olympus_identify (const ExifData *ed, const ExifEntry *e)
609 {
610 int variant = exif_mnote_data_olympus_identify_variant(e->data, e->size);
611
612 if (variant == nikonV0) {
613 /* This variant needs some extra checking with the Make */
614 char value[5];
615 ExifEntry *em = exif_data_get_entry (ed, EXIF_TAG_MAKE);
616 variant = unrecognized;
617
618 if (em) {
619 const char *v = exif_entry_get_value (em, value, sizeof(value));
620 if (v && (!strncmp (v, "Nikon", sizeof(value)) ||
621 !strncmp (v, "NIKON", sizeof(value)) ))
622 /* When saved, this variant will be written out like the
623 * alternative nikonV2 form above instead
624 */
625 variant = nikonV0;
626 }
627 }
628
629 return variant;
630 }
631
632
633 ExifMnoteData *
exif_mnote_data_olympus_new(ExifMem * mem)634 exif_mnote_data_olympus_new (ExifMem *mem)
635 {
636 ExifMnoteData *d;
637
638 if (!mem) return NULL;
639
640 d = exif_mem_alloc (mem, sizeof (ExifMnoteDataOlympus));
641 if (!d) return NULL;
642
643 exif_mnote_data_construct (d, mem);
644
645 /* Set up function pointers */
646 d->methods.free = exif_mnote_data_olympus_free;
647 d->methods.set_byte_order = exif_mnote_data_olympus_set_byte_order;
648 d->methods.set_offset = exif_mnote_data_olympus_set_offset;
649 d->methods.load = exif_mnote_data_olympus_load;
650 d->methods.save = exif_mnote_data_olympus_save;
651 d->methods.count = exif_mnote_data_olympus_count;
652 d->methods.get_id = exif_mnote_data_olympus_get_id;
653 d->methods.get_name = exif_mnote_data_olympus_get_name;
654 d->methods.get_title = exif_mnote_data_olympus_get_title;
655 d->methods.get_description = exif_mnote_data_olympus_get_description;
656 d->methods.get_value = exif_mnote_data_olympus_get_value;
657
658 return d;
659 }
660