exif-data.c

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00001 /* exif-data.c
00002  *
00003  * Copyright (c) 2001 Lutz Mueller <lutz@users.sourceforge.net>
00004  *
00005  * This library is free software; you can redistribute it and/or
00006  * modify it under the terms of the GNU Lesser General Public
00007  * License as published by the Free Software Foundation; either
00008  * version 2 of the License, or (at your option) any later version.
00009  *
00010  * This library is distributed in the hope that it will be useful,
00011  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013  * Lesser General Public License for more details.
00014  *
00015  * You should have received a copy of the GNU Lesser General Public
00016  * License along with this library; if not, write to the
00017  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
00018  * Boston, MA  02110-1301  USA.
00019  */
00020 
00021 #include <config.h>
00022 
00023 #include <libexif/exif-mnote-data.h>
00024 #include <libexif/exif-data.h>
00025 #include <libexif/exif-ifd.h>
00026 #include <libexif/exif-mnote-data-priv.h>
00027 #include <libexif/exif-utils.h>
00028 #include <libexif/exif-loader.h>
00029 #include <libexif/exif-log.h>
00030 #include <libexif/i18n.h>
00031 #include <libexif/exif-system.h>
00032 
00033 #include <libexif/canon/exif-mnote-data-canon.h>
00034 #include <libexif/fuji/exif-mnote-data-fuji.h>
00035 #include <libexif/olympus/exif-mnote-data-olympus.h>
00036 #include <libexif/pentax/exif-mnote-data-pentax.h>
00037 
00038 #include <stdlib.h>
00039 #include <stdio.h>
00040 #include <string.h>
00041 
00042 #undef JPEG_MARKER_SOI
00043 #define JPEG_MARKER_SOI  0xd8
00044 #undef JPEG_MARKER_APP0
00045 #define JPEG_MARKER_APP0 0xe0
00046 #undef JPEG_MARKER_APP1
00047 #define JPEG_MARKER_APP1 0xe1
00048 
00049 static const unsigned char ExifHeader[] = {0x45, 0x78, 0x69, 0x66, 0x00, 0x00};
00050 
00051 struct _ExifDataPrivate
00052 {
00053         ExifByteOrder order;
00054 
00055         ExifMnoteData *md;
00056 
00057         ExifLog *log;
00058         ExifMem *mem;
00059 
00060         unsigned int ref_count;
00061 
00062         /* Temporarily used while loading data */
00063         unsigned int offset_mnote;
00064 
00065         ExifDataOption options;
00066         ExifDataType data_type;
00067 };
00068 
00069 static void *
00070 exif_data_alloc (ExifData *data, unsigned int i)
00071 {
00072         void *d;
00073 
00074         if (!data || !i) 
00075                 return NULL;
00076 
00077         d = exif_mem_alloc (data->priv->mem, i);
00078         if (d) 
00079                 return d;
00080 
00081         EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", i);
00082         return NULL;
00083 }
00084 
00085 ExifMnoteData *
00086 exif_data_get_mnote_data (ExifData *d)
00087 {
00088         return (d && d->priv) ? d->priv->md : NULL;
00089 }
00090 
00091 ExifData *
00092 exif_data_new (void)
00093 {
00094         ExifMem *mem = exif_mem_new_default ();
00095         ExifData *d = exif_data_new_mem (mem);
00096 
00097         exif_mem_unref (mem);
00098 
00099         return d;
00100 }
00101 
00102 ExifData *
00103 exif_data_new_mem (ExifMem *mem)
00104 {
00105         ExifData *data;
00106         unsigned int i;
00107 
00108         if (!mem) 
00109                 return NULL;
00110 
00111         data = exif_mem_alloc (mem, sizeof (ExifData));
00112         if (!data) 
00113                 return (NULL);
00114         data->priv = exif_mem_alloc (mem, sizeof (ExifDataPrivate));
00115         if (!data->priv) { 
00116                 exif_mem_free (mem, data); 
00117                 return (NULL); 
00118         }
00119         data->priv->ref_count = 1;
00120 
00121         data->priv->mem = mem;
00122         exif_mem_ref (mem);
00123 
00124         for (i = 0; i < EXIF_IFD_COUNT; i++) {
00125                 data->ifd[i] = exif_content_new_mem (data->priv->mem);
00126                 if (!data->ifd[i]) {
00127                         exif_data_free (data);
00128                         return (NULL);
00129                 }
00130                 data->ifd[i]->parent = data;
00131         }
00132 
00133         /* Default options */
00134 #ifndef NO_VERBOSE_TAG_STRINGS
00135         /*
00136          * When the tag list is compiled away, setting this option prevents
00137          * any tags from being loaded
00138          */
00139         exif_data_set_option (data, EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS);
00140 #endif
00141         exif_data_set_option (data, EXIF_DATA_OPTION_FOLLOW_SPECIFICATION);
00142 
00143         /* Default data type: none */
00144         exif_data_set_data_type (data, EXIF_DATA_TYPE_COUNT);
00145 
00146         return (data);
00147 }
00148 
00149 ExifData *
00150 exif_data_new_from_data (const unsigned char *data, unsigned int size)
00151 {
00152         ExifData *edata;
00153 
00154         edata = exif_data_new ();
00155         exif_data_load_data (edata, data, size);
00156         return (edata);
00157 }
00158 
00159 static int
00160 exif_data_load_data_entry (ExifData *data, ExifEntry *entry,
00161                            const unsigned char *d,
00162                            unsigned int size, unsigned int offset)
00163 {
00164         unsigned int s, doff;
00165 
00166         entry->tag        = exif_get_short (d + offset + 0, data->priv->order);
00167         entry->format     = exif_get_short (d + offset + 2, data->priv->order);
00168         entry->components = exif_get_long  (d + offset + 4, data->priv->order);
00169 
00170         /* FIXME: should use exif_tag_get_name_in_ifd here but entry->parent 
00171          * has not been set yet
00172          */
00173         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00174                   "Loading entry 0x%x ('%s')...", entry->tag,
00175                   exif_tag_get_name (entry->tag));
00176 
00177         /* {0,1,2,4,8} x { 0x00000000 .. 0xffffffff } 
00178          *   -> { 0x000000000 .. 0x7fffffff8 } */
00179         s = exif_format_get_size(entry->format) * entry->components;
00180         if ((s < entry->components) || (s == 0)){
00181                 return 0;
00182         }
00183 
00184         /*
00185          * Size? If bigger than 4 bytes, the actual data is not
00186          * in the entry but somewhere else (offset).
00187          */
00188         if (s > 4)
00189                 doff = exif_get_long (d + offset + 8, data->priv->order);
00190         else
00191                 doff = offset + 8;
00192 
00193         /* Sanity checks */
00194         if ((doff + s < doff) || (doff + s < s) || (doff + s > size)) {
00195                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00196                                   "Tag data past end of buffer (%u > %u)", doff+s, size);       
00197                 return 0;
00198         }
00199 
00200         entry->data = exif_data_alloc (data, s);
00201         if (entry->data) {
00202                 entry->size = s;
00203                 memcpy (entry->data, d + doff, s);
00204         } else {
00205                 /* FIXME: What do our callers do if (entry->data == NULL)? */
00206                 EXIF_LOG_NO_MEMORY(data->priv->log, "ExifData", s);
00207         }
00208 
00209         /* If this is the MakerNote, remember the offset */
00210         if (entry->tag == EXIF_TAG_MAKER_NOTE) {
00211                 if (!entry->data) {
00212                         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00213                                           "MakerNote found with empty data");   
00214                 } else if (entry->size > 6) {
00215                         exif_log (data->priv->log,
00216                                                EXIF_LOG_CODE_DEBUG, "ExifData",
00217                                                "MakerNote found (%02x %02x %02x %02x "
00218                                                "%02x %02x %02x...).",
00219                                                entry->data[0], entry->data[1], entry->data[2],
00220                                                entry->data[3], entry->data[4], entry->data[5],
00221                                                entry->data[6]);
00222                 }
00223                 data->priv->offset_mnote = doff;
00224         }
00225         return 1;
00226 }
00227 
00228 static void
00229 exif_data_save_data_entry (ExifData *data, ExifEntry *e,
00230                            unsigned char **d, unsigned int *ds,
00231                            unsigned int offset)
00232 {
00233         unsigned int doff, s;
00234         unsigned int ts;
00235 
00236         if (!data || !data->priv) 
00237                 return;
00238 
00239         /*
00240          * Each entry is 12 bytes long. The memory for the entry has
00241          * already been allocated.
00242          */
00243         exif_set_short (*d + 6 + offset + 0,
00244                         data->priv->order, (ExifShort) e->tag);
00245         exif_set_short (*d + 6 + offset + 2,
00246                         data->priv->order, (ExifShort) e->format);
00247 
00248         if (!(data->priv->options & EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE)) {
00249                 /* If this is the maker note tag, update it. */
00250                 if ((e->tag == EXIF_TAG_MAKER_NOTE) && data->priv->md) {
00251                         /* TODO: this is using the wrong ExifMem to free e->data */
00252                         exif_mem_free (data->priv->mem, e->data);
00253                         e->data = NULL;
00254                         e->size = 0;
00255                         exif_mnote_data_set_offset (data->priv->md, *ds - 6);
00256                         exif_mnote_data_save (data->priv->md, &e->data, &e->size);
00257                         e->components = e->size;
00258                 }
00259         }
00260 
00261         exif_set_long  (*d + 6 + offset + 4,
00262                         data->priv->order, e->components);
00263 
00264         /*
00265          * Size? If bigger than 4 bytes, the actual data is not in
00266          * the entry but somewhere else.
00267          */
00268         s = exif_format_get_size (e->format) * e->components;
00269         if (s > 4) {
00270                 unsigned char *t;
00271                 doff = *ds - 6;
00272                 ts = *ds + s;
00273 
00274                 /*
00275                  * According to the TIFF specification,
00276                  * the offset must be an even number. If we need to introduce
00277                  * a padding byte, we set it to 0.
00278                  */
00279                 if (s & 1)
00280                         ts++;
00281                 t = exif_mem_realloc (data->priv->mem, *d, ts);
00282                 if (!t) {
00283                         EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
00284                         return;
00285                 }
00286                 *d = t;
00287                 *ds = ts;
00288                 exif_set_long (*d + 6 + offset + 8, data->priv->order, doff);
00289                 if (s & 1) 
00290                         *(*d + *ds - 1) = '\0';
00291 
00292         } else
00293                 doff = offset + 8;
00294 
00295         /* Write the data. Fill unneeded bytes with 0. Do not crash with
00296          * e->data is NULL */
00297         if (e->data) {
00298                 memcpy (*d + 6 + doff, e->data, s);
00299         } else {
00300                 memset (*d + 6 + doff, 0, s);
00301         }
00302         if (s < 4) 
00303                 memset (*d + 6 + doff + s, 0, (4 - s));
00304 }
00305 
00306 static void
00307 exif_data_load_data_thumbnail (ExifData *data, const unsigned char *d,
00308                                unsigned int ds, ExifLong o, ExifLong s)
00309 {
00310         /* Sanity checks */
00311         if ((o + s < o) || (o + s < s) || (o + s > ds) || (o > ds)) {
00312                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00313                           "Bogus thumbnail offset (%u) or size (%u).",
00314                           o, s);
00315                 return;
00316         }
00317 
00318         if (data->data) 
00319                 exif_mem_free (data->priv->mem, data->data);
00320         if (!(data->data = exif_data_alloc (data, s))) {
00321                 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", s);
00322                 data->size = 0;
00323                 return;
00324         }
00325         data->size = s;
00326         memcpy (data->data, d + o, s);
00327 }
00328 
00329 #undef CHECK_REC
00330 #define CHECK_REC(i)                                    \
00331 if ((i) == ifd) {                               \
00332         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
00333                 "ExifData", "Recursive entry in IFD "   \
00334                 "'%s' detected. Skipping...",           \
00335                 exif_ifd_get_name (i));                 \
00336         break;                                          \
00337 }                                                       \
00338 if (data->ifd[(i)]->count) {                            \
00339         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, \
00340                 "ExifData", "Attempt to load IFD "      \
00341                 "'%s' multiple times detected. "        \
00342                 "Skipping...",                          \
00343                 exif_ifd_get_name (i));                 \
00344         break;                                          \
00345 }
00346 
00357 static void
00358 exif_data_load_data_content (ExifData *data, ExifIfd ifd,
00359                              const unsigned char *d,
00360                              unsigned int ds, unsigned int offset, unsigned int recursion_depth)
00361 {
00362         ExifLong o, thumbnail_offset = 0, thumbnail_length = 0;
00363         ExifShort n;
00364         ExifEntry *entry;
00365         unsigned int i;
00366         ExifTag tag;
00367 
00368         if (!data || !data->priv) 
00369                 return;
00370 
00371         /* check for valid ExifIfd enum range */
00372         if ((((int)ifd) < 0) || ( ((int)ifd) >= EXIF_IFD_COUNT))
00373           return;
00374 
00375         if (recursion_depth > 30) {
00376                 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
00377                           "Deep recursion detected!");
00378                 return;
00379         }
00380 
00381         /* Read the number of entries */
00382         if ((offset + 2 < offset) || (offset + 2 < 2) || (offset + 2 > ds)) {
00383                 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData",
00384                           "Tag data past end of buffer (%u > %u)", offset+2, ds);
00385                 return;
00386         }
00387         n = exif_get_short (d + offset, data->priv->order);
00388         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00389                   "Loading %hu entries...", n);
00390         offset += 2;
00391 
00392         /* Check if we have enough data. */
00393         if (offset + 12 * n > ds) {
00394                 n = (ds - offset) / 12;
00395                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00396                                   "Short data; only loading %hu entries...", n);
00397         }
00398 
00399         for (i = 0; i < n; i++) {
00400 
00401                 tag = exif_get_short (d + offset + 12 * i, data->priv->order);
00402                 switch (tag) {
00403                 case EXIF_TAG_EXIF_IFD_POINTER:
00404                 case EXIF_TAG_GPS_INFO_IFD_POINTER:
00405                 case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
00406                 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
00407                 case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
00408                         o = exif_get_long (d + offset + 12 * i + 8,
00409                                            data->priv->order);
00410                         /* FIXME: IFD_POINTER tags aren't marked as being in a
00411                          * specific IFD, so exif_tag_get_name_in_ifd won't work
00412                          */
00413                         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00414                                   "Sub-IFD entry 0x%x ('%s') at %u.", tag,
00415                                   exif_tag_get_name(tag), o);
00416                         switch (tag) {
00417                         case EXIF_TAG_EXIF_IFD_POINTER:
00418                                 CHECK_REC (EXIF_IFD_EXIF);
00419                                 exif_data_load_data_content (data, EXIF_IFD_EXIF, d, ds, o, recursion_depth + 1);
00420                                 break;
00421                         case EXIF_TAG_GPS_INFO_IFD_POINTER:
00422                                 CHECK_REC (EXIF_IFD_GPS);
00423                                 exif_data_load_data_content (data, EXIF_IFD_GPS, d, ds, o, recursion_depth + 1);
00424                                 break;
00425                         case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
00426                                 CHECK_REC (EXIF_IFD_INTEROPERABILITY);
00427                                 exif_data_load_data_content (data, EXIF_IFD_INTEROPERABILITY, d, ds, o, recursion_depth + 1);
00428                                 break;
00429                         case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
00430                                 thumbnail_offset = o;
00431                                 if (thumbnail_offset && thumbnail_length)
00432                                         exif_data_load_data_thumbnail (data, d,
00433                                                                        ds, thumbnail_offset,
00434                                                                        thumbnail_length);
00435                                 break;
00436                         case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
00437                                 thumbnail_length = o;
00438                                 if (thumbnail_offset && thumbnail_length)
00439                                         exif_data_load_data_thumbnail (data, d,
00440                                                                        ds, thumbnail_offset,
00441                                                                        thumbnail_length);
00442                                 break;
00443                         default:
00444                                 return;
00445                         }
00446                         break;
00447                 default:
00448 
00449                         /*
00450                          * If we don't know the tag, don't fail. It could be that new 
00451                          * versions of the standard have defined additional tags. Note that
00452                          * 0 is a valid tag in the GPS IFD.
00453                          */
00454                         if (!exif_tag_get_name_in_ifd (tag, ifd)) {
00455 
00456                                 /*
00457                                  * Special case: Tag and format 0. That's against specification
00458                                  * (at least up to 2.2). But Photoshop writes it anyways.
00459                                  */
00460                                 if (!memcmp (d + offset + 12 * i, "\0\0\0\0", 4)) {
00461                                         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00462                                                   "Skipping empty entry at position %u in '%s'.", i, 
00463                                                   exif_ifd_get_name (ifd));
00464                                         break;
00465                                 }
00466                                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00467                                           "Unknown tag 0x%04x (entry %u in '%s'). Please report this tag "
00468                                           "to <libexif-devel@lists.sourceforge.net>.", tag, i,
00469                                           exif_ifd_get_name (ifd));
00470                                 if (data->priv->options & EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS)
00471                                         break;
00472                         }
00473                         entry = exif_entry_new_mem (data->priv->mem);
00474                         if (exif_data_load_data_entry (data, entry, d, ds,
00475                                                    offset + 12 * i))
00476                                 exif_content_add_entry (data->ifd[ifd], entry);
00477                         exif_entry_unref (entry);
00478                         break;
00479                 }
00480         }
00481 }
00482 
00483 static int
00484 cmp_func (const unsigned char *p1, const unsigned char *p2, ExifByteOrder o)
00485 {
00486         ExifShort tag1 = exif_get_short (p1, o);
00487         ExifShort tag2 = exif_get_short (p2, o);
00488 
00489         return (tag1 < tag2) ? -1 : (tag1 > tag2) ? 1 : 0;
00490 }
00491 
00492 static int
00493 cmp_func_intel (const void *elem1, const void *elem2)
00494 {
00495         return cmp_func ((const unsigned char *) elem1,
00496                          (const unsigned char *) elem2, EXIF_BYTE_ORDER_INTEL);
00497 }
00498 
00499 static int
00500 cmp_func_motorola (const void *elem1, const void *elem2)
00501 {
00502         return cmp_func ((const unsigned char *) elem1,
00503                          (const unsigned char *) elem2, EXIF_BYTE_ORDER_MOTOROLA);
00504 }
00505 
00506 static void
00507 exif_data_save_data_content (ExifData *data, ExifContent *ifd,
00508                              unsigned char **d, unsigned int *ds,
00509                              unsigned int offset)
00510 {
00511         unsigned int j, n_ptr = 0, n_thumb = 0;
00512         ExifIfd i;
00513         unsigned char *t;
00514         unsigned int ts;
00515 
00516         if (!data || !data->priv || !ifd || !d || !ds) 
00517                 return;
00518 
00519         for (i = 0; i < EXIF_IFD_COUNT; i++)
00520                 if (ifd == data->ifd[i])
00521                         break;
00522         if (i == EXIF_IFD_COUNT)
00523                 return; /* error */
00524 
00525         /*
00526          * Check if we need some extra entries for pointers or the thumbnail.
00527          */
00528         switch (i) {
00529         case EXIF_IFD_0:
00530 
00531                 /*
00532                  * The pointer to IFD_EXIF is in IFD_0. The pointer to
00533                  * IFD_INTEROPERABILITY is in IFD_EXIF.
00534                  */
00535                 if (data->ifd[EXIF_IFD_EXIF]->count ||
00536                     data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
00537                         n_ptr++;
00538 
00539                 /* The pointer to IFD_GPS is in IFD_0. */
00540                 if (data->ifd[EXIF_IFD_GPS]->count)
00541                         n_ptr++;
00542 
00543                 break;
00544         case EXIF_IFD_1:
00545                 if (data->size)
00546                         n_thumb = 2;
00547                 break;
00548         case EXIF_IFD_EXIF:
00549                 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count)
00550                         n_ptr++;
00551         default:
00552                 break;
00553         }
00554 
00555         /*
00556          * Allocate enough memory for all entries
00557          * and the number of entries.
00558          */
00559         ts = *ds + (2 + (ifd->count + n_ptr + n_thumb) * 12 + 4);
00560         t = exif_mem_realloc (data->priv->mem, *d, ts);
00561         if (!t) {
00562                 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData", ts);
00563                 return;
00564         }
00565         *d = t;
00566         *ds = ts;
00567 
00568         /* Save the number of entries */
00569         exif_set_short (*d + 6 + offset, data->priv->order,
00570                         (ExifShort) (ifd->count + n_ptr + n_thumb));
00571         offset += 2;
00572 
00573         /*
00574          * Save each entry. Make sure that no memcpys from NULL pointers are
00575          * performed
00576          */
00577         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00578                   "Saving %i entries (IFD '%s', offset: %i)...",
00579                   ifd->count, exif_ifd_get_name (i), offset);
00580         for (j = 0; j < ifd->count; j++) {
00581                 if (ifd->entries[j]) {
00582                         exif_data_save_data_entry (data, ifd->entries[j], d, ds,
00583                                 offset + 12 * j);
00584                 }
00585         }
00586 
00587         offset += 12 * ifd->count;
00588 
00589         /* Now save special entries. */
00590         switch (i) {
00591         case EXIF_IFD_0:
00592 
00593                 /*
00594                  * The pointer to IFD_EXIF is in IFD_0.
00595                  * However, the pointer to IFD_INTEROPERABILITY is in IFD_EXIF,
00596                  * therefore, if IFD_INTEROPERABILITY is not empty, we need
00597                  * IFD_EXIF even if latter is empty.
00598                  */
00599                 if (data->ifd[EXIF_IFD_EXIF]->count ||
00600                     data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
00601                         exif_set_short (*d + 6 + offset + 0, data->priv->order,
00602                                         EXIF_TAG_EXIF_IFD_POINTER);
00603                         exif_set_short (*d + 6 + offset + 2, data->priv->order,
00604                                         EXIF_FORMAT_LONG);
00605                         exif_set_long  (*d + 6 + offset + 4, data->priv->order,
00606                                         1);
00607                         exif_set_long  (*d + 6 + offset + 8, data->priv->order,
00608                                         *ds - 6);
00609                         exif_data_save_data_content (data,
00610                                                      data->ifd[EXIF_IFD_EXIF], d, ds, *ds - 6);
00611                         offset += 12;
00612                 }
00613 
00614                 /* The pointer to IFD_GPS is in IFD_0, too. */
00615                 if (data->ifd[EXIF_IFD_GPS]->count) {
00616                         exif_set_short (*d + 6 + offset + 0, data->priv->order,
00617                                         EXIF_TAG_GPS_INFO_IFD_POINTER);
00618                         exif_set_short (*d + 6 + offset + 2, data->priv->order,
00619                                         EXIF_FORMAT_LONG);
00620                         exif_set_long  (*d + 6 + offset + 4, data->priv->order,
00621                                         1);
00622                         exif_set_long  (*d + 6 + offset + 8, data->priv->order,
00623                                         *ds - 6);
00624                         exif_data_save_data_content (data,
00625                                                      data->ifd[EXIF_IFD_GPS], d, ds, *ds - 6);
00626                         offset += 12;
00627                 }
00628 
00629                 break;
00630         case EXIF_IFD_EXIF:
00631 
00632                 /*
00633                  * The pointer to IFD_INTEROPERABILITY is in IFD_EXIF.
00634                  * See note above.
00635                  */
00636                 if (data->ifd[EXIF_IFD_INTEROPERABILITY]->count) {
00637                         exif_set_short (*d + 6 + offset + 0, data->priv->order,
00638                                         EXIF_TAG_INTEROPERABILITY_IFD_POINTER);
00639                         exif_set_short (*d + 6 + offset + 2, data->priv->order,
00640                                         EXIF_FORMAT_LONG);
00641                         exif_set_long  (*d + 6 + offset + 4, data->priv->order,
00642                                         1);
00643                         exif_set_long  (*d + 6 + offset + 8, data->priv->order,
00644                                         *ds - 6);
00645                         exif_data_save_data_content (data,
00646                                                      data->ifd[EXIF_IFD_INTEROPERABILITY], d, ds,
00647                                                      *ds - 6);
00648                         offset += 12;
00649                 }
00650 
00651                 break;
00652         case EXIF_IFD_1:
00653 
00654                 /*
00655                  * Information about the thumbnail (if any) is saved in
00656                  * IFD_1.
00657                  */
00658                 if (data->size) {
00659 
00660                         /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT */
00661                         exif_set_short (*d + 6 + offset + 0, data->priv->order,
00662                                         EXIF_TAG_JPEG_INTERCHANGE_FORMAT);
00663                         exif_set_short (*d + 6 + offset + 2, data->priv->order,
00664                                         EXIF_FORMAT_LONG);
00665                         exif_set_long  (*d + 6 + offset + 4, data->priv->order,
00666                                         1);
00667                         exif_set_long  (*d + 6 + offset + 8, data->priv->order,
00668                                         *ds - 6);
00669                         ts = *ds + data->size;
00670                         t = exif_mem_realloc (data->priv->mem, *d, ts);
00671                         if (!t) {
00672                                 EXIF_LOG_NO_MEMORY (data->priv->log, "ExifData",
00673                                                     ts);
00674                                 return;
00675                         }
00676                         *d = t;
00677                         *ds = ts;
00678                         memcpy (*d + *ds - data->size, data->data, data->size);
00679                         offset += 12;
00680 
00681                         /* EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH */
00682                         exif_set_short (*d + 6 + offset + 0, data->priv->order,
00683                                         EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
00684                         exif_set_short (*d + 6 + offset + 2, data->priv->order,
00685                                         EXIF_FORMAT_LONG);
00686                         exif_set_long  (*d + 6 + offset + 4, data->priv->order,
00687                                         1);
00688                         exif_set_long  (*d + 6 + offset + 8, data->priv->order,
00689                                         data->size);
00690                         offset += 12;
00691                 }
00692 
00693                 break;
00694         default:
00695                 break;
00696         }
00697 
00698         /* Sort the directory according to TIFF specification */
00699         qsort (*d + 6 + offset - (ifd->count + n_ptr + n_thumb) * 12,
00700                (ifd->count + n_ptr + n_thumb), 12,
00701                (data->priv->order == EXIF_BYTE_ORDER_INTEL) ? cmp_func_intel : cmp_func_motorola);
00702 
00703         /* Correctly terminate the directory */
00704         if (i == EXIF_IFD_0 && (data->ifd[EXIF_IFD_1]->count ||
00705                                 data->size)) {
00706 
00707                 /*
00708                  * We are saving IFD 0. Tell where IFD 1 starts and save
00709                  * IFD 1.
00710                  */
00711                 exif_set_long (*d + 6 + offset, data->priv->order, *ds - 6);
00712                 exif_data_save_data_content (data, data->ifd[EXIF_IFD_1], d, ds,
00713                                              *ds - 6);
00714         } else
00715                 exif_set_long (*d + 6 + offset, data->priv->order, 0);
00716 }
00717 
00718 typedef enum {
00719         EXIF_DATA_TYPE_MAKER_NOTE_NONE          = 0,
00720         EXIF_DATA_TYPE_MAKER_NOTE_CANON         = 1,
00721         EXIF_DATA_TYPE_MAKER_NOTE_OLYMPUS       = 2,
00722         EXIF_DATA_TYPE_MAKER_NOTE_PENTAX        = 3,
00723         EXIF_DATA_TYPE_MAKER_NOTE_NIKON         = 4,
00724         EXIF_DATA_TYPE_MAKER_NOTE_CASIO         = 5,
00725         EXIF_DATA_TYPE_MAKER_NOTE_FUJI          = 6
00726 } ExifDataTypeMakerNote;
00727 
00734 static void
00735 interpret_maker_note(ExifData *data, const unsigned char *d, unsigned int ds)
00736 {
00737         int mnoteid;
00738         ExifEntry* e = exif_data_get_entry (data, EXIF_TAG_MAKER_NOTE);
00739         if (!e)
00740                 return;
00741         
00742         if ((mnoteid = exif_mnote_data_olympus_identify (data, e)) != 0) {
00743                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
00744                         "ExifData", "Olympus MakerNote variant type %d", mnoteid);
00745                 data->priv->md = exif_mnote_data_olympus_new (data->priv->mem);
00746 
00747         } else if ((mnoteid = exif_mnote_data_canon_identify (data, e)) != 0) {
00748                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
00749                         "ExifData", "Canon MakerNote variant type %d", mnoteid);
00750                 data->priv->md = exif_mnote_data_canon_new (data->priv->mem, data->priv->options);
00751 
00752         } else if ((mnoteid = exif_mnote_data_fuji_identify (data, e)) != 0) {
00753                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
00754                         "ExifData", "Fuji MakerNote variant type %d", mnoteid);
00755                 data->priv->md = exif_mnote_data_fuji_new (data->priv->mem);
00756 
00757         /* NOTE: Must do Pentax detection last because some of the
00758          * heuristics are pretty general. */
00759         } else if ((mnoteid = exif_mnote_data_pentax_identify (data, e)) != 0) {
00760                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG,
00761                         "ExifData", "Pentax MakerNote variant type %d", mnoteid);
00762                 data->priv->md = exif_mnote_data_pentax_new (data->priv->mem);
00763         }
00764 
00765         /* 
00766          * If we are able to interpret the maker note, do so.
00767          */
00768         if (data->priv->md) {
00769                 exif_mnote_data_log (data->priv->md, data->priv->log);
00770                 exif_mnote_data_set_byte_order (data->priv->md,
00771                                                 data->priv->order);
00772                 exif_mnote_data_set_offset (data->priv->md,
00773                                             data->priv->offset_mnote);
00774                 exif_mnote_data_load (data->priv->md, d, ds);
00775         }
00776 }
00777 
00778 #define LOG_TOO_SMALL \
00779 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA, "ExifData", \
00780                 _("Size of data too small to allow for EXIF data."));
00781 
00782 void
00783 exif_data_load_data (ExifData *data, const unsigned char *d_orig,
00784                      unsigned int ds)
00785 {
00786         unsigned int l;
00787         ExifLong offset;
00788         ExifShort n;
00789         const unsigned char *d = d_orig;
00790         unsigned int len, fullds;
00791 
00792         if (!data || !data->priv || !d || !ds)
00793                 return;
00794 
00795         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00796                   "Parsing %i byte(s) EXIF data...\n", ds);
00797 
00798         /*
00799          * It can be that the data starts with the EXIF header. If it does
00800          * not, search the EXIF marker.
00801          */
00802         if (ds < 6) {
00803                 LOG_TOO_SMALL;
00804                 return;
00805         }
00806         if (!memcmp (d, ExifHeader, 6)) {
00807                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00808                           "Found EXIF header.");
00809         } else {
00810                 while (ds >= 3) {
00811                         while (ds && (d[0] == 0xff)) {
00812                                 d++;
00813                                 ds--;
00814                         }
00815 
00816                         /* JPEG_MARKER_SOI */
00817                         if (ds && d[0] == JPEG_MARKER_SOI) {
00818                                 d++;
00819                                 ds--;
00820                                 continue;
00821                         }
00822 
00823                         /* JPEG_MARKER_APP0 */
00824                         if (ds >= 3 && d[0] == JPEG_MARKER_APP0) {
00825                                 d++;
00826                                 ds--;
00827                                 l = (d[0] << 8) | d[1];
00828                                 if (l > ds)
00829                                         return;
00830                                 d += l;
00831                                 ds -= l;
00832                                 continue;
00833                         }
00834 
00835                         /* JPEG_MARKER_APP1 */
00836                         if (ds && d[0] == JPEG_MARKER_APP1)
00837                                 break;
00838 
00839                         /* Unknown marker or data. Give up. */
00840                         exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
00841                                   "ExifData", _("EXIF marker not found."));
00842                         return;
00843                 }
00844                 if (ds < 3) {
00845                         LOG_TOO_SMALL;
00846                         return;
00847                 }
00848                 d++;
00849                 ds--;
00850                 len = (d[0] << 8) | d[1];
00851                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00852                           "We have to deal with %i byte(s) of EXIF data.",
00853                           len);
00854                 d += 2;
00855                 ds -= 2;
00856         }
00857 
00858         /*
00859          * Verify the exif header
00860          * (offset 2, length 6).
00861          */
00862         if (ds < 6) {
00863                 LOG_TOO_SMALL;
00864                 return;
00865         }
00866         if (memcmp (d, ExifHeader, 6)) {
00867                 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
00868                           "ExifData", _("EXIF header not found."));
00869                 return;
00870         }
00871 
00872         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00873                   "Found EXIF header.");
00874 
00875         /* Sanity check the data length */
00876         if (ds < 14)
00877                 return;
00878 
00879         /* The JPEG APP1 section can be no longer than 64 KiB (including a
00880            16-bit length), so cap the data length to protect against overflow
00881            in future offset calculations */
00882         fullds = ds;
00883         if (ds > 0xfffe)
00884                 ds = 0xfffe;
00885 
00886         /* Byte order (offset 6, length 2) */
00887         if (!memcmp (d + 6, "II", 2))
00888                 data->priv->order = EXIF_BYTE_ORDER_INTEL;
00889         else if (!memcmp (d + 6, "MM", 2))
00890                 data->priv->order = EXIF_BYTE_ORDER_MOTOROLA;
00891         else {
00892                 exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
00893                           "ExifData", _("Unknown encoding."));
00894                 return;
00895         }
00896 
00897         /* Fixed value */
00898         if (exif_get_short (d + 8, data->priv->order) != 0x002a)
00899                 return;
00900 
00901         /* IFD 0 offset */
00902         offset = exif_get_long (d + 10, data->priv->order);
00903         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData", 
00904                   "IFD 0 at %i.", (int) offset);
00905 
00906         /* Sanity check the offset, being careful about overflow */
00907         if (offset > ds || offset + 6 + 2 > ds)
00908                 return;
00909 
00910         /* Parse the actual exif data (usually offset 14 from start) */
00911         exif_data_load_data_content (data, EXIF_IFD_0, d + 6, ds - 6, offset, 0);
00912 
00913         /* IFD 1 offset */
00914         n = exif_get_short (d + 6 + offset, data->priv->order);
00915         if (offset + 6 + 2 + 12 * n + 4 > ds)
00916                 return;
00917 
00918         offset = exif_get_long (d + 6 + offset + 2 + 12 * n, data->priv->order);
00919         if (offset) {
00920                 exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00921                           "IFD 1 at %i.", (int) offset);
00922 
00923                 /* Sanity check. */
00924                 if (offset > ds || offset + 6 > ds) {
00925                         exif_log (data->priv->log, EXIF_LOG_CODE_CORRUPT_DATA,
00926                                   "ExifData", "Bogus offset of IFD1.");
00927                 } else {
00928                    exif_data_load_data_content (data, EXIF_IFD_1, d + 6, ds - 6, offset, 0);
00929                 }
00930         }
00931 
00932         /*
00933          * If we got an EXIF_TAG_MAKER_NOTE, try to interpret it. Some
00934          * cameras use pointers in the maker note tag that point to the
00935          * space between IFDs. Here is the only place where we have access
00936          * to that data.
00937          */
00938         interpret_maker_note(data, d, fullds);
00939 
00940         /* Fixup tags if requested */
00941         if (data->priv->options & EXIF_DATA_OPTION_FOLLOW_SPECIFICATION)
00942                 exif_data_fix (data);
00943 }
00944 
00945 void
00946 exif_data_save_data (ExifData *data, unsigned char **d, unsigned int *ds)
00947 {
00948         if (ds)
00949                 *ds = 0;        /* This means something went wrong */
00950 
00951         if (!data || !d || !ds)
00952                 return;
00953 
00954         /* Header */
00955         *ds = 14;
00956         *d = exif_data_alloc (data, *ds);
00957         if (!*d)  {
00958                 *ds = 0;
00959                 return;
00960         }
00961         memcpy (*d, ExifHeader, 6);
00962 
00963         /* Order (offset 6) */
00964         if (data->priv->order == EXIF_BYTE_ORDER_INTEL) {
00965                 memcpy (*d + 6, "II", 2);
00966         } else {
00967                 memcpy (*d + 6, "MM", 2);
00968         }
00969 
00970         /* Fixed value (2 bytes, offset 8) */
00971         exif_set_short (*d + 8, data->priv->order, 0x002a);
00972 
00973         /*
00974          * IFD 0 offset (4 bytes, offset 10).
00975          * We will start 8 bytes after the
00976          * EXIF header (2 bytes for order, another 2 for the test, and
00977          * 4 bytes for the IFD 0 offset make 8 bytes together).
00978          */
00979         exif_set_long (*d + 10, data->priv->order, 8);
00980 
00981         /* Now save IFD 0. IFD 1 will be saved automatically. */
00982         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00983                   "Saving IFDs...");
00984         exif_data_save_data_content (data, data->ifd[EXIF_IFD_0], d, ds,
00985                                      *ds - 6);
00986         exif_log (data->priv->log, EXIF_LOG_CODE_DEBUG, "ExifData",
00987                   "Saved %i byte(s) EXIF data.", *ds);
00988 }
00989 
00990 ExifData *
00991 exif_data_new_from_file (const char *path)
00992 {
00993         ExifData *edata;
00994         ExifLoader *loader;
00995 
00996         loader = exif_loader_new ();
00997         exif_loader_write_file (loader, path);
00998         edata = exif_loader_get_data (loader);
00999         exif_loader_unref (loader);
01000 
01001         return (edata);
01002 }
01003 
01004 void
01005 exif_data_ref (ExifData *data)
01006 {
01007         if (!data)
01008                 return;
01009 
01010         data->priv->ref_count++;
01011 }
01012 
01013 void
01014 exif_data_unref (ExifData *data)
01015 {
01016         if (!data) 
01017                 return;
01018 
01019         data->priv->ref_count--;
01020         if (!data->priv->ref_count) 
01021                 exif_data_free (data);
01022 }
01023 
01024 void
01025 exif_data_free (ExifData *data)
01026 {
01027         unsigned int i;
01028         ExifMem *mem = (data && data->priv) ? data->priv->mem : NULL;
01029 
01030         if (!data) 
01031                 return;
01032 
01033         for (i = 0; i < EXIF_IFD_COUNT; i++) {
01034                 if (data->ifd[i]) {
01035                         exif_content_unref (data->ifd[i]);
01036                         data->ifd[i] = NULL;
01037                 }
01038         }
01039 
01040         if (data->data) {
01041                 exif_mem_free (mem, data->data);
01042                 data->data = NULL;
01043         }
01044 
01045         if (data->priv) {
01046                 if (data->priv->log) {
01047                         exif_log_unref (data->priv->log);
01048                         data->priv->log = NULL;
01049                 }
01050                 if (data->priv->md) {
01051                         exif_mnote_data_unref (data->priv->md);
01052                         data->priv->md = NULL;
01053                 }
01054                 exif_mem_free (mem, data->priv);
01055                 exif_mem_free (mem, data);
01056         }
01057 
01058         exif_mem_unref (mem);
01059 }
01060 
01061 void
01062 exif_data_dump (ExifData *data)
01063 {
01064         unsigned int i;
01065 
01066         if (!data)
01067                 return;
01068 
01069         for (i = 0; i < EXIF_IFD_COUNT; i++) {
01070                 if (data->ifd[i] && data->ifd[i]->count) {
01071                         printf ("Dumping IFD '%s'...\n",
01072                                 exif_ifd_get_name (i));
01073                         exif_content_dump (data->ifd[i], 0);
01074                 }
01075         }
01076 
01077         if (data->data) {
01078                 printf ("%i byte(s) thumbnail data available.", data->size);
01079                 if (data->size >= 4) {
01080                         printf ("0x%02x 0x%02x ... 0x%02x 0x%02x\n",
01081                                 data->data[0], data->data[1],
01082                                 data->data[data->size - 2],
01083                                 data->data[data->size - 1]);
01084                 }
01085         }
01086 }
01087 
01088 ExifByteOrder
01089 exif_data_get_byte_order (ExifData *data)
01090 {
01091         if (!data)
01092                 return (0);
01093 
01094         return (data->priv->order);
01095 }
01096 
01097 void
01098 exif_data_foreach_content (ExifData *data, ExifDataForeachContentFunc func,
01099                            void *user_data)
01100 {
01101         unsigned int i;
01102 
01103         if (!data || !func)
01104                 return;
01105 
01106         for (i = 0; i < EXIF_IFD_COUNT; i++)
01107                 func (data->ifd[i], user_data);
01108 }
01109 
01110 typedef struct _ByteOrderChangeData ByteOrderChangeData;
01111 struct _ByteOrderChangeData {
01112         ExifByteOrder old, new;
01113 };
01114 
01115 static void
01116 entry_set_byte_order (ExifEntry *e, void *data)
01117 {
01118         ByteOrderChangeData *d = data;
01119 
01120         if (!e)
01121                 return;
01122 
01123         exif_array_set_byte_order (e->format, e->data, e->components, d->old, d->new);
01124 }
01125 
01126 static void
01127 content_set_byte_order (ExifContent *content, void *data)
01128 {
01129         exif_content_foreach_entry (content, entry_set_byte_order, data);
01130 }
01131 
01132 void
01133 exif_data_set_byte_order (ExifData *data, ExifByteOrder order)
01134 {
01135         ByteOrderChangeData d;
01136 
01137         if (!data || (order == data->priv->order))
01138                 return;
01139 
01140         d.old = data->priv->order;
01141         d.new = order;
01142         exif_data_foreach_content (data, content_set_byte_order, &d);
01143         data->priv->order = order;
01144         if (data->priv->md)
01145                 exif_mnote_data_set_byte_order (data->priv->md, order);
01146 }
01147 
01148 void
01149 exif_data_log (ExifData *data, ExifLog *log)
01150 {
01151         unsigned int i;
01152 
01153         if (!data || !data->priv) 
01154                 return;
01155         exif_log_unref (data->priv->log);
01156         data->priv->log = log;
01157         exif_log_ref (log);
01158 
01159         for (i = 0; i < EXIF_IFD_COUNT; i++)
01160                 exif_content_log (data->ifd[i], log);
01161 }
01162 
01163 /* Used internally within libexif */
01164 ExifLog *exif_data_get_log (ExifData *);
01165 ExifLog *
01166 exif_data_get_log (ExifData *data)
01167 {
01168         if (!data || !data->priv) 
01169                 return NULL;
01170         return data->priv->log;
01171 }
01172 
01173 static const struct {
01174         ExifDataOption option;
01175         const char *name;
01176         const char *description;
01177 } exif_data_option[] = {
01178         {EXIF_DATA_OPTION_IGNORE_UNKNOWN_TAGS, N_("Ignore unknown tags"),
01179          N_("Ignore unknown tags when loading EXIF data.")},
01180         {EXIF_DATA_OPTION_FOLLOW_SPECIFICATION, N_("Follow specification"),
01181          N_("Add, correct and remove entries to get EXIF data that follows "
01182             "the specification.")},
01183         {EXIF_DATA_OPTION_DONT_CHANGE_MAKER_NOTE, N_("Do not change maker note"),
01184          N_("When loading and resaving Exif data, save the maker note unmodified."
01185             " Be aware that the maker note can get corrupted.")},
01186         {0, NULL, NULL}
01187 };
01188 
01189 const char *
01190 exif_data_option_get_name (ExifDataOption o)
01191 {
01192         unsigned int i;
01193 
01194         for (i = 0; exif_data_option[i].name; i++)
01195                 if (exif_data_option[i].option == o) 
01196                         break;
01197         return _(exif_data_option[i].name);
01198 }
01199 
01200 const char *
01201 exif_data_option_get_description (ExifDataOption o)
01202 {
01203         unsigned int i;
01204 
01205         for (i = 0; exif_data_option[i].description; i++)
01206                 if (exif_data_option[i].option == o) 
01207                         break;
01208         return _(exif_data_option[i].description);
01209 }
01210 
01211 void
01212 exif_data_set_option (ExifData *d, ExifDataOption o)
01213 {
01214         if (!d) 
01215                 return;
01216 
01217         d->priv->options |= o;
01218 }
01219 
01220 void
01221 exif_data_unset_option (ExifData *d, ExifDataOption o)
01222 {
01223         if (!d) 
01224                 return;
01225 
01226         d->priv->options &= ~o;
01227 }
01228 
01229 static void
01230 fix_func (ExifContent *c, void *UNUSED(data))
01231 {
01232         switch (exif_content_get_ifd (c)) {
01233         case EXIF_IFD_1:
01234                 if (c->parent->data)
01235                         exif_content_fix (c);
01236                 else if (c->count) {
01237                         exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
01238                                   "No thumbnail but entries on thumbnail. These entries have been "
01239                                   "removed.");
01240                         while (c->count) {
01241                                 unsigned int cnt = c->count;
01242                                 exif_content_remove_entry (c, c->entries[c->count - 1]);
01243                                 if (cnt == c->count) {
01244                                         /* safety net */
01245                                         exif_log (c->parent->priv->log, EXIF_LOG_CODE_DEBUG, "exif-data",
01246                                         "failed to remove last entry from entries.");
01247                                         c->count--;
01248                                 }
01249                         }
01250                 }
01251                 break;
01252         default:
01253                 exif_content_fix (c);
01254         }
01255 }
01256 
01257 void
01258 exif_data_fix (ExifData *d)
01259 {
01260         exif_data_foreach_content (d, fix_func, NULL);
01261 }
01262 
01263 void
01264 exif_data_set_data_type (ExifData *d, ExifDataType dt)
01265 {
01266         if (!d || !d->priv) 
01267                 return;
01268 
01269         d->priv->data_type = dt;
01270 }
01271 
01272 ExifDataType
01273 exif_data_get_data_type (ExifData *d)
01274 {
01275         return (d && d->priv) ? d->priv->data_type : EXIF_DATA_TYPE_UNKNOWN;
01276 }

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