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| 1 /* exif-mnote-data-canon.c |
| 2 * |
| 3 * Copyright (c) 2002, 2003 Lutz Mueller <lutz@users.sourceforge.net> |
| 4 * Copyright (c) 2003 Matthieu Castet <mat-c@users.sourceforge.net> |
| 5 * |
| 6 * This library is free software; you can redistribute it and/or |
| 7 * modify it under the terms of the GNU Lesser General Public |
| 8 * License as published by the Free Software Foundation; either |
| 9 * version 2 of the License, or (at your option) any later version. |
| 10 * |
| 11 * This library is distributed in the hope that it will be useful, |
| 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 * Lesser General Public License for more details. |
| 15 * |
| 16 * You should have received a copy of the GNU Lesser General Public |
| 17 * License along with this library; if not, write to the |
| 18 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 19 * Boston, MA 02110-1301 USA. |
| 20 */ |
| 21 |
| 22 #include <config.h> |
| 23 #include "exif-mnote-data-canon.h" |
| 24 |
| 25 #include <stdlib.h> |
| 26 #include <stdio.h> |
| 27 #include <string.h> |
| 28 |
| 29 #include <libexif/exif-byte-order.h> |
| 30 #include <libexif/exif-utils.h> |
| 31 #include <libexif/exif-data.h> |
| 32 |
| 33 #define DEBUG |
| 34 |
| 35 static void |
| 36 exif_mnote_data_canon_clear (ExifMnoteDataCanon *n) |
| 37 { |
| 38 ExifMnoteData *d = (ExifMnoteData *) n; |
| 39 unsigned int i; |
| 40 |
| 41 if (!n) return; |
| 42 |
| 43 if (n->entries) { |
| 44 for (i = 0; i < n->count; i++) |
| 45 if (n->entries[i].data) { |
| 46 exif_mem_free (d->mem, n->entries[i].data); |
| 47 n->entries[i].data = NULL; |
| 48 } |
| 49 exif_mem_free (d->mem, n->entries); |
| 50 n->entries = NULL; |
| 51 n->count = 0; |
| 52 } |
| 53 } |
| 54 |
| 55 static void |
| 56 exif_mnote_data_canon_free (ExifMnoteData *n) |
| 57 { |
| 58 if (!n) return; |
| 59 |
| 60 exif_mnote_data_canon_clear ((ExifMnoteDataCanon *) n); |
| 61 } |
| 62 |
| 63 static void |
| 64 exif_mnote_data_canon_get_tags (ExifMnoteDataCanon *dc, unsigned int n, |
| 65 unsigned int *m, unsigned int *s) |
| 66 { |
| 67 unsigned int from = 0, to; |
| 68 |
| 69 if (!dc || !m) return; |
| 70 for (*m = 0; *m < dc->count; (*m)++) { |
| 71 to = from + mnote_canon_entry_count_values (&dc->entries[*m]); |
| 72 if (to > n) { |
| 73 if (s) *s = n - from; |
| 74 break; |
| 75 } |
| 76 from = to; |
| 77 } |
| 78 } |
| 79 |
| 80 static char * |
| 81 exif_mnote_data_canon_get_value (ExifMnoteData *note, unsigned int n, char *val,
unsigned int maxlen) |
| 82 { |
| 83 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note; |
| 84 unsigned int m, s; |
| 85 |
| 86 if (!dc) return NULL; |
| 87 exif_mnote_data_canon_get_tags (dc, n, &m, &s); |
| 88 if (m >= dc->count) return NULL; |
| 89 return mnote_canon_entry_get_value (&dc->entries[m], s, val, maxlen); |
| 90 } |
| 91 |
| 92 static void |
| 93 exif_mnote_data_canon_set_byte_order (ExifMnoteData *d, ExifByteOrder o) |
| 94 { |
| 95 ExifByteOrder o_orig; |
| 96 ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) d; |
| 97 unsigned int i; |
| 98 |
| 99 if (!n) return; |
| 100 |
| 101 o_orig = n->order; |
| 102 n->order = o; |
| 103 for (i = 0; i < n->count; i++) { |
| 104 n->entries[i].order = o; |
| 105 exif_array_set_byte_order (n->entries[i].format, n->entries[i].d
ata, |
| 106 n->entries[i].components, o_orig, o); |
| 107 } |
| 108 } |
| 109 |
| 110 static void |
| 111 exif_mnote_data_canon_set_offset (ExifMnoteData *n, unsigned int o) |
| 112 { |
| 113 if (n) ((ExifMnoteDataCanon *) n)->offset = o; |
| 114 } |
| 115 |
| 116 static void |
| 117 exif_mnote_data_canon_save (ExifMnoteData *ne, |
| 118 unsigned char **buf, unsigned int *buf_size) |
| 119 { |
| 120 ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) ne; |
| 121 size_t i, o, s, doff; |
| 122 unsigned char *t; |
| 123 size_t ts; |
| 124 |
| 125 if (!n || !buf || !buf_size) return; |
| 126 |
| 127 /* |
| 128 * Allocate enough memory for all entries and the number |
| 129 * of entries. |
| 130 */ |
| 131 *buf_size = 2 + n->count * 12 + 4; |
| 132 *buf = exif_mem_alloc (ne->mem, sizeof (char) * *buf_size); |
| 133 if (!*buf) { |
| 134 EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteCanon", *buf_size); |
| 135 return; |
| 136 } |
| 137 |
| 138 /* Save the number of entries */ |
| 139 exif_set_short (*buf, n->order, (ExifShort) n->count); |
| 140 |
| 141 /* Save each entry */ |
| 142 for (i = 0; i < n->count; i++) { |
| 143 o = 2 + i * 12; |
| 144 exif_set_short (*buf + o + 0, n->order, (ExifShort) n->entries[i
].tag); |
| 145 exif_set_short (*buf + o + 2, n->order, (ExifShort) n->entries[i
].format); |
| 146 exif_set_long (*buf + o + 4, n->order, |
| 147 n->entries[i].components); |
| 148 o += 8; |
| 149 s = exif_format_get_size (n->entries[i].format) * |
| 150 n->entries[i].components; |
| 151 if (s > 65536) { |
| 152 /* Corrupt data: EXIF data size is limited to the |
| 153 * maximum size of a JPEG segment (64 kb). |
| 154 */ |
| 155 continue; |
| 156 } |
| 157 if (s > 4) { |
| 158 ts = *buf_size + s; |
| 159 |
| 160 /* Ensure even offsets. Set padding bytes to 0. */ |
| 161 if (s & 1) ts += 1; |
| 162 t = exif_mem_realloc (ne->mem, *buf, |
| 163 sizeof (char) * ts); |
| 164 if (!t) { |
| 165 EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteCanon", ts
); |
| 166 return; |
| 167 } |
| 168 *buf = t; |
| 169 *buf_size = ts; |
| 170 doff = *buf_size - s; |
| 171 if (s & 1) { doff--; *(*buf + *buf_size - 1) = '\0'; } |
| 172 exif_set_long (*buf + o, n->order, n->offset + doff); |
| 173 } else |
| 174 doff = o; |
| 175 |
| 176 /* |
| 177 * Write the data. Fill unneeded bytes with 0. Do not |
| 178 * crash if data is NULL. |
| 179 */ |
| 180 if (!n->entries[i].data) memset (*buf + doff, 0, s); |
| 181 else memcpy (*buf + doff, n->entries[i].data, s); |
| 182 if (s < 4) memset (*buf + doff + s, 0, (4 - s)); |
| 183 } |
| 184 } |
| 185 |
| 186 /* XXX |
| 187 * FIXME: exif_mnote_data_canon_load() may fail and there is no |
| 188 * semantics to express that. |
| 189 * See bug #1054323 for details, especially the comment by liblit |
| 190 * after it has supposedly been fixed: |
| 191 * |
| 192 * https://sourceforge.net/tracker/?func=detail&aid=1054323&group_id=1227
2&atid=112272 |
| 193 * Unfortunately, the "return" statements aren't commented at |
| 194 * all, so it isn't trivial to find out what is a normal |
| 195 * return, and what is a reaction to an error condition. |
| 196 */ |
| 197 |
| 198 static void |
| 199 exif_mnote_data_canon_load (ExifMnoteData *ne, |
| 200 const unsigned char *buf, unsigned int buf_size) |
| 201 { |
| 202 ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) ne; |
| 203 ExifShort c; |
| 204 size_t i, tcount, o, datao; |
| 205 |
| 206 if (!n || !buf || !buf_size) { |
| 207 exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, |
| 208 "ExifMnoteCanon", "Short MakerNote"); |
| 209 return; |
| 210 } |
| 211 datao = 6 + n->offset; |
| 212 if ((datao + 2 < datao) || (datao + 2 < 2) || (datao + 2 > buf_size)) { |
| 213 exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, |
| 214 "ExifMnoteCanon", "Short MakerNote"); |
| 215 return; |
| 216 } |
| 217 |
| 218 /* Read the number of tags */ |
| 219 c = exif_get_short (buf + datao, n->order); |
| 220 datao += 2; |
| 221 |
| 222 /* Remove any old entries */ |
| 223 exif_mnote_data_canon_clear (n); |
| 224 |
| 225 /* Reserve enough space for all the possible MakerNote tags */ |
| 226 n->entries = exif_mem_alloc (ne->mem, sizeof (MnoteCanonEntry) * c); |
| 227 if (!n->entries) { |
| 228 EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteCanon", sizeof (MnoteCanon
Entry) * c); |
| 229 return; |
| 230 } |
| 231 |
| 232 /* Parse the entries */ |
| 233 tcount = 0; |
| 234 for (i = c, o = datao; i; --i, o += 12) { |
| 235 size_t s; |
| 236 if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) { |
| 237 exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, |
| 238 "ExifMnoteCanon", "Short MakerNote"); |
| 239 break; |
| 240 } |
| 241 |
| 242 n->entries[tcount].tag = exif_get_short (buf + o, n->orde
r); |
| 243 n->entries[tcount].format = exif_get_short (buf + o + 2, n->
order); |
| 244 n->entries[tcount].components = exif_get_long (buf + o + 4, n->o
rder); |
| 245 n->entries[tcount].order = n->order; |
| 246 |
| 247 exif_log (ne->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteCanon", |
| 248 "Loading entry 0x%x ('%s')...", n->entries[tcount].tag, |
| 249 mnote_canon_tag_get_name (n->entries[tcount].tag)); |
| 250 |
| 251 /* |
| 252 * Size? If bigger than 4 bytes, the actual data is not |
| 253 * in the entry but somewhere else (offset). |
| 254 */ |
| 255 s = exif_format_get_size (n->entries[tcount].format) * |
| 256 n->entries[tco
unt].components; |
| 257 n->entries[tcount].size = s; |
| 258 if (!s) { |
| 259 exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, |
| 260 "ExifMnoteCanon", |
| 261 "Invalid zero-length tag size"); |
| 262 continue; |
| 263 |
| 264 } else { |
| 265 size_t dataofs = o + 8; |
| 266 if (s > 4) dataofs = exif_get_long (buf + dataofs, n->or
der) + 6; |
| 267 if ((dataofs + s < s) || (dataofs + s < dataofs) || (dat
aofs + s > buf_size)) { |
| 268 exif_log (ne->log, EXIF_LOG_CODE_DEBUG, |
| 269 "ExifMnoteCanon", |
| 270 "Tag data past end of buffer (%u > %u)", |
| 271 dataofs + s, buf_size); |
| 272 continue; |
| 273 } |
| 274 |
| 275 n->entries[tcount].data = exif_mem_alloc (ne->mem, s); |
| 276 if (!n->entries[tcount].data) { |
| 277 EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteCanon", s)
; |
| 278 continue; |
| 279 } |
| 280 memcpy (n->entries[tcount].data, buf + dataofs, s); |
| 281 } |
| 282 |
| 283 /* Tag was successfully parsed */ |
| 284 ++tcount; |
| 285 } |
| 286 /* Store the count of successfully parsed tags */ |
| 287 n->count = tcount; |
| 288 } |
| 289 |
| 290 static unsigned int |
| 291 exif_mnote_data_canon_count (ExifMnoteData *n) |
| 292 { |
| 293 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) n; |
| 294 unsigned int i, c; |
| 295 |
| 296 for (i = c = 0; dc && (i < dc->count); i++) |
| 297 c += mnote_canon_entry_count_values (&dc->entries[i]); |
| 298 return c; |
| 299 } |
| 300 |
| 301 static unsigned int |
| 302 exif_mnote_data_canon_get_id (ExifMnoteData *d, unsigned int i) |
| 303 { |
| 304 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) d; |
| 305 unsigned int m; |
| 306 |
| 307 if (!dc) return 0; |
| 308 exif_mnote_data_canon_get_tags (dc, i, &m, NULL); |
| 309 if (m >= dc->count) return 0; |
| 310 return dc->entries[m].tag; |
| 311 } |
| 312 |
| 313 static const char * |
| 314 exif_mnote_data_canon_get_name (ExifMnoteData *note, unsigned int i) |
| 315 { |
| 316 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note; |
| 317 unsigned int m, s; |
| 318 |
| 319 if (!dc) return NULL; |
| 320 exif_mnote_data_canon_get_tags (dc, i, &m, &s); |
| 321 if (m >= dc->count) return NULL; |
| 322 return mnote_canon_tag_get_name_sub (dc->entries[m].tag, s, dc->options)
; |
| 323 } |
| 324 |
| 325 static const char * |
| 326 exif_mnote_data_canon_get_title (ExifMnoteData *note, unsigned int i) |
| 327 { |
| 328 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note; |
| 329 unsigned int m, s; |
| 330 |
| 331 if (!dc) return NULL; |
| 332 exif_mnote_data_canon_get_tags (dc, i, &m, &s); |
| 333 if (m >= dc->count) return NULL; |
| 334 return mnote_canon_tag_get_title_sub (dc->entries[m].tag, s, dc->options
); |
| 335 } |
| 336 |
| 337 static const char * |
| 338 exif_mnote_data_canon_get_description (ExifMnoteData *note, unsigned int i) |
| 339 { |
| 340 ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note; |
| 341 unsigned int m; |
| 342 |
| 343 if (!dc) return NULL; |
| 344 exif_mnote_data_canon_get_tags (dc, i, &m, NULL); |
| 345 if (m >= dc->count) return NULL; |
| 346 return mnote_canon_tag_get_description (dc->entries[m].tag); |
| 347 } |
| 348 |
| 349 int |
| 350 exif_mnote_data_canon_identify (const ExifData *ed, const ExifEntry *e) |
| 351 { |
| 352 char value[8]; |
| 353 ExifEntry *em = exif_data_get_entry (ed, EXIF_TAG_MAKE); |
| 354 if (!em) |
| 355 return 0; |
| 356 return !strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon
"); |
| 357 } |
| 358 |
| 359 ExifMnoteData * |
| 360 exif_mnote_data_canon_new (ExifMem *mem, ExifDataOption o) |
| 361 { |
| 362 ExifMnoteData *d; |
| 363 ExifMnoteDataCanon *dc; |
| 364 |
| 365 if (!mem) return NULL; |
| 366 |
| 367 d = exif_mem_alloc (mem, sizeof (ExifMnoteDataCanon)); |
| 368 if (!d) |
| 369 return NULL; |
| 370 |
| 371 exif_mnote_data_construct (d, mem); |
| 372 |
| 373 /* Set up function pointers */ |
| 374 d->methods.free = exif_mnote_data_canon_free; |
| 375 d->methods.set_byte_order = exif_mnote_data_canon_set_byte_order; |
| 376 d->methods.set_offset = exif_mnote_data_canon_set_offset; |
| 377 d->methods.load = exif_mnote_data_canon_load; |
| 378 d->methods.save = exif_mnote_data_canon_save; |
| 379 d->methods.count = exif_mnote_data_canon_count; |
| 380 d->methods.get_id = exif_mnote_data_canon_get_id; |
| 381 d->methods.get_name = exif_mnote_data_canon_get_name; |
| 382 d->methods.get_title = exif_mnote_data_canon_get_title; |
| 383 d->methods.get_description = exif_mnote_data_canon_get_description; |
| 384 d->methods.get_value = exif_mnote_data_canon_get_value; |
| 385 |
| 386 dc = (ExifMnoteDataCanon*)d; |
| 387 dc->options = o; |
| 388 return d; |
| 389 } |
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