Marco Nelissen | 548dde4 | 2014-01-07 10:11:28 -0800 | [diff] [blame] | 1 | /* exif-mnote-data-fuji.c |
| 2 | * |
| 3 | * Copyright (c) 2002 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 <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 " |
Mark Salyzyn | fa0c1e7 | 2014-04-18 12:51:18 -0700 | [diff] [blame] | 228 | "buffer (%zu >= %u)", dataofs + s, buf_size); |
Marco Nelissen | 548dde4 | 2014-01-07 10:11:28 -0800 | [diff] [blame] | 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 | } |