1 /* exif-mnote-data-fuji.c 2 * 3 * Copyright (c) 2002 Lutz Mueller <lutz (at) 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 <stdlib.h> 22 #include <string.h> 23 24 25 #include <config.h> 26 #include <libexif/exif-byte-order.h> 27 #include <libexif/exif-utils.h> 28 29 #include "exif-mnote-data-fuji.h" 30 31 struct _MNoteFujiDataPrivate { 32 ExifByteOrder order; 33 }; 34 35 static void 36 exif_mnote_data_fuji_clear (ExifMnoteDataFuji *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_fuji_free (ExifMnoteData *n) 57 { 58 if (!n) return; 59 60 exif_mnote_data_fuji_clear ((ExifMnoteDataFuji *) n); 61 } 62 63 static char * 64 exif_mnote_data_fuji_get_value (ExifMnoteData *d, unsigned int i, char *val, unsigned int maxlen) 65 { 66 ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d; 67 68 if (!d || !val) return NULL; 69 if (i > n->count -1) return NULL; 70 /* 71 exif_log (d->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataFuji", 72 "Querying value for tag '%s'...", 73 mnote_fuji_tag_get_name (n->entries[i].tag)); 74 */ 75 return mnote_fuji_entry_get_value (&n->entries[i], val, maxlen); 76 } 77 78 static void 79 exif_mnote_data_fuji_save (ExifMnoteData *ne, unsigned char **buf, 80 unsigned int *buf_size) 81 { 82 ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) ne; 83 size_t i, o, s, doff; 84 unsigned char *t; 85 size_t ts; 86 87 if (!n || !buf || !buf_size) return; 88 89 /* 90 * Allocate enough memory for all entries and the number 91 * of entries. 92 */ 93 *buf_size = 8 + 4 + 2 + n->count * 12 + 4; 94 *buf = exif_mem_alloc (ne->mem, *buf_size); 95 if (!*buf) { 96 *buf_size = 0; 97 return; 98 } 99 100 /* 101 * Header: "FUJIFILM" and 4 bytes offset to the first entry. 102 * As the first entry will start right thereafter, the offset is 12. 103 */ 104 memcpy (*buf, "FUJIFILM", 8); 105 exif_set_long (*buf + 8, n->order, 12); 106 107 /* Save the number of entries */ 108 exif_set_short (*buf + 8 + 4, n->order, (ExifShort) n->count); 109 110 /* Save each entry */ 111 for (i = 0; i < n->count; i++) { 112 o = 8 + 4 + 2 + i * 12; 113 exif_set_short (*buf + o + 0, n->order, (ExifShort) n->entries[i].tag); 114 exif_set_short (*buf + o + 2, n->order, (ExifShort) n->entries[i].format); 115 exif_set_long (*buf + o + 4, n->order, n->entries[i].components); 116 o += 8; 117 s = exif_format_get_size (n->entries[i].format) * 118 n->entries[i].components; 119 if (s > 65536) { 120 /* Corrupt data: EXIF data size is limited to the 121 * maximum size of a JPEG segment (64 kb). 122 */ 123 continue; 124 } 125 if (s > 4) { 126 ts = *buf_size + s; 127 128 /* Ensure even offsets. Set padding bytes to 0. */ 129 if (s & 1) ts += 1; 130 t = exif_mem_realloc (ne->mem, *buf, ts); 131 if (!t) { 132 return; 133 } 134 *buf = t; 135 *buf_size = ts; 136 doff = *buf_size - s; 137 if (s & 1) { doff--; *(*buf + *buf_size - 1) = '\0'; } 138 exif_set_long (*buf + o, n->order, doff); 139 } else 140 doff = o; 141 142 /* 143 * Write the data. Fill unneeded bytes with 0. Do not 144 * crash if data is NULL. 145 */ 146 if (!n->entries[i].data) memset (*buf + doff, 0, s); 147 else memcpy (*buf + doff, n->entries[i].data, s); 148 } 149 } 150 151 static void 152 exif_mnote_data_fuji_load (ExifMnoteData *en, 153 const unsigned char *buf, unsigned int buf_size) 154 { 155 ExifMnoteDataFuji *n = (ExifMnoteDataFuji*) en; 156 ExifLong c; 157 size_t i, tcount, o, datao; 158 159 if (!n || !buf || !buf_size) { 160 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, 161 "ExifMnoteDataFuji", "Short MakerNote"); 162 return; 163 } 164 datao = 6 + n->offset; 165 if ((datao + 12 < datao) || (datao + 12 < 12) || (datao + 12 > buf_size)) { 166 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, 167 "ExifMnoteDataFuji", "Short MakerNote"); 168 return; 169 } 170 171 n->order = EXIF_BYTE_ORDER_INTEL; 172 datao += exif_get_long (buf + datao + 8, EXIF_BYTE_ORDER_INTEL); 173 if ((datao + 2 < datao) || (datao + 2 < 2) || 174 (datao + 2 > buf_size)) { 175 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, 176 "ExifMnoteDataFuji", "Short MakerNote"); 177 return; 178 } 179 180 /* Read the number of tags */ 181 c = exif_get_short (buf + datao, EXIF_BYTE_ORDER_INTEL); 182 datao += 2; 183 184 /* Remove any old entries */ 185 exif_mnote_data_fuji_clear (n); 186 187 /* Reserve enough space for all the possible MakerNote tags */ 188 n->entries = exif_mem_alloc (en->mem, sizeof (MnoteFujiEntry) * c); 189 if (!n->entries) { 190 EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteDataFuji", sizeof (MnoteFujiEntry) * c); 191 return; 192 } 193 194 /* Parse all c entries, storing ones that are successfully parsed */ 195 tcount = 0; 196 for (i = c, o = datao; i; --i, o += 12) { 197 size_t s; 198 if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) { 199 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, 200 "ExifMnoteDataFuji", "Short MakerNote"); 201 break; 202 } 203 204 n->entries[tcount].tag = exif_get_short (buf + o, n->order); 205 n->entries[tcount].format = exif_get_short (buf + o + 2, n->order); 206 n->entries[tcount].components = exif_get_long (buf + o + 4, n->order); 207 n->entries[tcount].order = n->order; 208 209 exif_log (en->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteDataFuji", 210 "Loading entry 0x%x ('%s')...", n->entries[tcount].tag, 211 mnote_fuji_tag_get_name (n->entries[tcount].tag)); 212 213 /* 214 * Size? If bigger than 4 bytes, the actual data is not 215 * in the entry but somewhere else (offset). 216 */ 217 s = exif_format_get_size (n->entries[tcount].format) * n->entries[tcount].components; 218 n->entries[tcount].size = s; 219 if (s) { 220 size_t dataofs = o + 8; 221 if (s > 4) 222 /* The data in this case is merely a pointer */ 223 dataofs = exif_get_long (buf + dataofs, n->order) + 6 + n->offset; 224 if ((dataofs + s < dataofs) || (dataofs + s < s) || 225 (dataofs + s >= buf_size)) { 226 exif_log (en->log, EXIF_LOG_CODE_CORRUPT_DATA, 227 "ExifMnoteDataFuji", "Tag data past end of " 228 "buffer (%zu >= %u)", dataofs + s, buf_size); 229 continue; 230 } 231 232 n->entries[tcount].data = exif_mem_alloc (en->mem, s); 233 if (!n->entries[tcount].data) { 234 EXIF_LOG_NO_MEMORY(en->log, "ExifMnoteDataFuji", s); 235 continue; 236 } 237 memcpy (n->entries[tcount].data, buf + dataofs, s); 238 } 239 240 /* Tag was successfully parsed */ 241 ++tcount; 242 } 243 /* Store the count of successfully parsed tags */ 244 n->count = tcount; 245 } 246 247 static unsigned int 248 exif_mnote_data_fuji_count (ExifMnoteData *n) 249 { 250 return n ? ((ExifMnoteDataFuji *) n)->count : 0; 251 } 252 253 static unsigned int 254 exif_mnote_data_fuji_get_id (ExifMnoteData *d, unsigned int n) 255 { 256 ExifMnoteDataFuji *note = (ExifMnoteDataFuji *) d; 257 258 if (!note) return 0; 259 if (note->count <= n) return 0; 260 return note->entries[n].tag; 261 } 262 263 static const char * 264 exif_mnote_data_fuji_get_name (ExifMnoteData *d, unsigned int i) 265 { 266 ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d; 267 268 if (!n) return NULL; 269 if (i >= n->count) return NULL; 270 return mnote_fuji_tag_get_name (n->entries[i].tag); 271 } 272 273 static const char * 274 exif_mnote_data_fuji_get_title (ExifMnoteData *d, unsigned int i) 275 { 276 ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d; 277 278 if (!n) return NULL; 279 if (i >= n->count) return NULL; 280 return mnote_fuji_tag_get_title (n->entries[i].tag); 281 } 282 283 static const char * 284 exif_mnote_data_fuji_get_description (ExifMnoteData *d, unsigned int i) 285 { 286 ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d; 287 288 if (!n) return NULL; 289 if (i >= n->count) return NULL; 290 return mnote_fuji_tag_get_description (n->entries[i].tag); 291 } 292 293 static void 294 exif_mnote_data_fuji_set_byte_order (ExifMnoteData *d, ExifByteOrder o) 295 { 296 ExifByteOrder o_orig; 297 ExifMnoteDataFuji *n = (ExifMnoteDataFuji *) d; 298 unsigned int i; 299 300 if (!n) return; 301 302 o_orig = n->order; 303 n->order = o; 304 for (i = 0; i < n->count; i++) { 305 n->entries[i].order = o; 306 exif_array_set_byte_order (n->entries[i].format, n->entries[i].data, 307 n->entries[i].components, o_orig, o); 308 } 309 } 310 311 static void 312 exif_mnote_data_fuji_set_offset (ExifMnoteData *n, unsigned int o) 313 { 314 if (n) ((ExifMnoteDataFuji *) n)->offset = o; 315 } 316 317 int 318 exif_mnote_data_fuji_identify (const ExifData *ed, const ExifEntry *e) 319 { 320 return ((e->size >= 12) && !memcmp (e->data, "FUJIFILM", 8)); 321 } 322 323 ExifMnoteData * 324 exif_mnote_data_fuji_new (ExifMem *mem) 325 { 326 ExifMnoteData *d; 327 328 if (!mem) return NULL; 329 330 d = exif_mem_alloc (mem, sizeof (ExifMnoteDataFuji)); 331 if (!d) return NULL; 332 333 exif_mnote_data_construct (d, mem); 334 335 /* Set up function pointers */ 336 d->methods.free = exif_mnote_data_fuji_free; 337 d->methods.set_byte_order = exif_mnote_data_fuji_set_byte_order; 338 d->methods.set_offset = exif_mnote_data_fuji_set_offset; 339 d->methods.load = exif_mnote_data_fuji_load; 340 d->methods.save = exif_mnote_data_fuji_save; 341 d->methods.count = exif_mnote_data_fuji_count; 342 d->methods.get_id = exif_mnote_data_fuji_get_id; 343 d->methods.get_name = exif_mnote_data_fuji_get_name; 344 d->methods.get_title = exif_mnote_data_fuji_get_title; 345 d->methods.get_description = exif_mnote_data_fuji_get_description; 346 d->methods.get_value = exif_mnote_data_fuji_get_value; 347 348 return d; 349 } 350
