OLD | NEW |
(Empty) | |
| 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 |
| 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 |
| 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 * |
| 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 |
| 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 wil
l 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, "ExifMnoteDataOlympu
s", 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 |
| 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-o
2); |
| 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 als
o 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 (MnoteOly
mpusEntry) * 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->orde
r); |
| 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 f
rom 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 of
fset; 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 (%u > %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 |
| 506 exif_mnote_data_olympus_count (ExifMnoteData *n) |
| 507 { |
| 508 return n ? ((ExifMnoteDataOlympus *) n)->count : 0; |
| 509 } |
| 510 |
| 511 static unsigned int |
| 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 * |
| 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 * |
| 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 * |
| 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 |
| 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].d
ata, |
| 565 n->entries[i].components, o_orig, o); |
| 566 } |
| 567 } |
| 568 |
| 569 static void |
| 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 |
| 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 |
| 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 * |
| 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 } |
OLD | NEW |