libexif/exif-entry.c

   1 /* exif-entry.c
   2  *
   3  * Copyright © 2001 Lutz Müller <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., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include <config.h>
  22
  23 #include <libexif/exif-entry.h>
  24 #include <libexif/exif-ifd.h>
  25 #include <libexif/exif-utils.h>
  26 #include <libexif/i18n.h>
  27
  28 #include <ctype.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32 #include <time.h>
  33 #include <math.h>
  34
  35 struct _ExifEntryPrivate
  36 {
  37         unsigned int ref_count;
  38
  39         ExifMem *mem;
  40 };
  41
  42 /* This function is hidden in exif-data.c */
  43 ExifLog *exif_data_get_log (ExifData *);
  44
  45 static void
  46 exif_entry_log (ExifEntry *e, ExifLogCode code, const char *format, ...)
  47 {
  48         va_list args;
  49         ExifLog *l = NULL;
  50
  51         if (e && e->parent && e->parent->parent)
  52                 l = exif_data_get_log (e->parent->parent);
  53         va_start (args, format);
  54         exif_logv (l, code, "ExifEntry", format, args);
  55         va_end (args);
  56 }
  57
  58 static void *
  59 exif_entry_alloc (ExifEntry *e, unsigned int i)
  60 {
  61         void *d;
  62         ExifLog *l = NULL;
  63
  64         if (!e || !e->priv || !i) return NULL;
  65
  66         d = exif_mem_alloc (e->priv->mem, i);
  67         if (d) return d;
  68
  69         if (e->parent && e->parent->parent)
  70                 l = exif_data_get_log (e->parent->parent);
  71         EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
  72         return NULL;
  73 }
  74
  75 static void *
  76 exif_entry_realloc (ExifEntry *e, void *d_orig, unsigned int i)
  77 {
  78         void *d;
  79         ExifLog *l = NULL;
  80
  81         if (!e || !e->priv) return NULL;
  82
  83         if (!i) { exif_mem_free (e->priv->mem, d_orig); return NULL; }
  84
  85         d = exif_mem_realloc (e->priv->mem, d_orig, i);
  86         if (d) return d;
  87
  88         if (e->parent && e->parent->parent)
  89                 l = exif_data_get_log (e->parent->parent);
  90         EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
  91         return NULL;
  92 }
  93
  94 ExifEntry *
  95 exif_entry_new (void)
  96 {
  97         ExifMem *mem = exif_mem_new_default ();
  98         ExifEntry *e = exif_entry_new_mem (mem);
  99
 100         exif_mem_unref (mem);
 101
 102         return e;
 103 }
 104
 105 ExifEntry *
 106 exif_entry_new_mem (ExifMem *mem)
 107 {
 108         ExifEntry *e = NULL;
 109
 110         e = exif_mem_alloc (mem, sizeof (ExifEntry));
 111         if (!e) return NULL;
 112         e->priv = exif_mem_alloc (mem, sizeof (ExifEntryPrivate));
 113         if (!e->priv) { exif_mem_free (mem, e); return NULL; }
 114         e->priv->ref_count = 1;
 115
 116         e->priv->mem = mem;
 117         exif_mem_ref (mem);
 118
 119         return e;
 120 }
 121
 122 void
 123 exif_entry_ref (ExifEntry *e)
 124 {
 125         if (!e) return;
 126
 127         e->priv->ref_count++;
 128 }
 129
 130 void
 131 exif_entry_unref (ExifEntry *e)
 132 {
 133         if (!e) return;
 134
 135         e->priv->ref_count--;
 136         if (!e->priv->ref_count)
 137                 exif_entry_free (e);
 138 }
 139
 140 void
 141 exif_entry_free (ExifEntry *e)
 142 {
 143         if (!e) return;
 144
 145         if (e->priv) {
 146                 ExifMem *mem = e->priv->mem;
 147                 if (e->data)
 148                         exif_mem_free (mem, e->data);
 149                 exif_mem_free (mem, e->priv);
 150                 exif_mem_free (mem, e);
 151                 exif_mem_unref (mem);
 152         }
 153 }
 154
 155 void
 156 exif_entry_fix (ExifEntry *e)
 157 {
 158         unsigned int i;
 159         ExifByteOrder o;
 160         ExifRational r;
 161         ExifSRational sr;
 162
 163         if (!e || !e->priv) return;
 164
 165         switch (e->tag) {
 166
 167         /* These tags all need to be of format SHORT. */
 168         case EXIF_TAG_YCBCR_SUB_SAMPLING:
 169         case EXIF_TAG_SUBJECT_AREA:
 170         case EXIF_TAG_COLOR_SPACE:
 171         case EXIF_TAG_PLANAR_CONFIGURATION:
 172         case EXIF_TAG_SENSING_METHOD:
 173         case EXIF_TAG_ORIENTATION:
 174         case EXIF_TAG_YCBCR_POSITIONING:
 175         case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
 176         case EXIF_TAG_CUSTOM_RENDERED:
 177         case EXIF_TAG_EXPOSURE_MODE:
 178         case EXIF_TAG_WHITE_BALANCE:
 179         case EXIF_TAG_SCENE_CAPTURE_TYPE:
 180         case EXIF_TAG_GAIN_CONTROL:
 181         case EXIF_TAG_SATURATION:
 182         case EXIF_TAG_CONTRAST:
 183         case EXIF_TAG_SHARPNESS:
 184                 switch (e->format) {
 185                 case EXIF_FORMAT_LONG:
 186                         if (!e->parent || !e->parent->parent) break;
 187                         o = exif_data_get_byte_order (e->parent->parent);
 188                         for (i = 0; i < e->components; i++)
 189                                 exif_set_short (
 190                                         e->data + i *
 191                                         exif_format_get_size (
 192                                         EXIF_FORMAT_SHORT), o,
 193                                         (ExifShort) exif_get_long (
 194                                         e->data + i *
 195                                         exif_format_get_size (
 196                                         EXIF_FORMAT_LONG), o));
 197                         e->format = EXIF_FORMAT_SHORT;
 198                         e->size = e->components *
 199                                 exif_format_get_size (e->format);
 200                         e->data = exif_entry_realloc (e, e->data, e->size);
 201                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 202                                 "Tag '%s' was of format '%s' (which is "
 203                                 "against specification) and has been "
 204                                 "changed to format '%s'.",
 205                                 exif_tag_get_name (e->tag),
 206                                 exif_format_get_name (EXIF_FORMAT_LONG),
 207                                 exif_format_get_name (EXIF_FORMAT_SHORT));
 208                         break;
 209                 case EXIF_FORMAT_SHORT:
 210                 default:
 211                         break;
 212                 }
 213                 break;
 214
 215         /* All these tags need to be of format 'Rational'. */
 216         case EXIF_TAG_FNUMBER:
 217         case EXIF_TAG_APERTURE_VALUE:
 218         case EXIF_TAG_EXPOSURE_TIME:
 219         case EXIF_TAG_FOCAL_LENGTH:
 220                 switch (e->format) {
 221                 case EXIF_FORMAT_SRATIONAL:
 222                         if (!e->parent || !e->parent->parent) break;
 223                         o = exif_data_get_byte_order (e->parent->parent);
 224                         for (i = 0; i < e->components; i++) {
 225                                 sr = exif_get_srational (e->data + i *
 226                                         exif_format_get_size (
 227                                                 EXIF_FORMAT_SRATIONAL), o);
 228                                 r.numerator = (ExifLong) sr.numerator;
 229                                 r.denominator = (ExifLong) sr.denominator;
 230                                 exif_set_rational (e->data + i *
 231                                         exif_format_get_size (
 232                                                 EXIF_FORMAT_RATIONAL), o, r);
 233                         }
 234                         e->format = EXIF_FORMAT_RATIONAL;
 235                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 236                                 "Tag '%s' was of format '%s' (which is "
 237                                 "against specification) and has been "
 238                                 "changed to format '%s'.",
 239                                 exif_tag_get_name (e->tag),
 240                                 exif_format_get_name (EXIF_FORMAT_SRATIONAL),
 241                                 exif_format_get_name (EXIF_FORMAT_RATIONAL));
 242                         break;
 243                 default:
 244                         break;
 245                 }
 246                 break;
 247
 248         case EXIF_TAG_USER_COMMENT:
 249
 250                 /* Format needs to be UNDEFINED. */
 251                 if (e->format != EXIF_FORMAT_UNDEFINED) {
 252                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 253                                 "Tag 'UserComment' had invalid format '%s'. "
 254                                 "Format has been set to 'undefined'.",
 255                                 exif_format_get_name (e->format));
 256                         e->format = EXIF_FORMAT_UNDEFINED;
 257                 }
 258
 259                 /* Some packages like Canon ZoomBrowser EX 4.5 store
 260                    only one zero byte followed by 7 bytes of rubbish */
 261                 if ((e->size >= 8) && (e->data[0] == 0)) {
 262                         memcpy(e->data, "\0\0\0\0\0\0\0\0", 8);
 263                 }
 264
 265                 /* There need to be at least 8 bytes. */
 266                 if (e->size < 8) {
 267                         e->data = exif_entry_realloc (e, e->data, 8 + e->size);
 268                         if (!e->data) {
 269                                 e->size = 0;
 270                                 e->components = 0;
 271                                 return;
 272                         }
 273
 274                         /* Assume ASCII */
 275                         memmove (e->data + 8, e->data, e->size);
 276                         memcpy (e->data, "ASCII\0\0\0", 8);
 277                         e->size += 8;
 278                         e->components += 8;
 279                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 280                                 "Tag 'UserComment' has been expanded to at "
 281                                 "least 8 bytes in order to follow the "
 282                                 "specification.");
 283                         break;
 284                 }
 285
 286                 /*
 287                  * If the first 8 bytes are empty and real data starts
 288                  * afterwards, let's assume ASCII and claim the 8 first
 289                  * bytes for the format specifyer.
 290                  */
 291                 for (i = 0; (i < e->size) && !e->data[i]; i++);
 292                 if (!i) for ( ; (i < e->size) && (e->data[i] = ' '); i++);
 293                 if ((i >= 8) && (i < e->size)) {
 294                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 295                                 "Tag 'UserComment' is not empty but does not start with "
 296                                 "format identifyer. This has been fixed.");
 297                         memcpy (e->data, "ASCII\0\0\0", 8);
 298                 }
 299
 300                 /* First 8 bytes need to follow the specification. */
 301                 if (memcmp (e->data, "ASCII\0\0\0"     , 8) &&
 302                     memcmp (e->data, "UNICODE\0"       , 8) &&
 303                     memcmp (e->data, "JIS\0\0\0\0\0"   , 8) &&
 304                     memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)) {
 305                         e->data = exif_entry_realloc (e, e->data, 8 + e->size);
 306                         if (!e->data) {
 307                                 e->size = 0;
 308                                 e->components = 0;
 309                                 break;
 310                         }
 311
 312                         /* Assume ASCII */
 313                         memmove (e->data + 8, e->data, e->size);
 314                         memcpy (e->data, "ASCII\0\0\0", 8);
 315                         e->size += 8;
 316                         e->components += 8;
 317                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 318                                 "Tag 'UserComment' did not start with "
 319                                 "format identifyer. This has been fixed.");
 320                         break;
 321                 }
 322
 323                 break;
 324         default:
 325                 break;
 326         }
 327 }
 328
 329 void
 330 exif_entry_dump (ExifEntry *e, unsigned int indent)
 331 {
 332         char buf[1024];
 333         char value[1024];
 334         unsigned int i;
 335
 336         for (i = 0; i < 2 * indent; i++)
 337                 buf[i] = ' ';
 338         buf[i] = '\0';
 339
 340         if (!e)
 341                 return;
 342
 343         printf ("%sTag: 0x%x ('%s')\n", buf, e->tag,
 344                 exif_tag_get_name (e->tag));
 345         printf ("%s  Format: %i ('%s')\n", buf, e->format,
 346                 exif_format_get_name (e->format));
 347         printf ("%s  Components: %i\n", buf, (int) e->components);
 348         printf ("%s  Size: %i\n", buf, e->size);
 349         printf ("%s  Value: %s\n", buf, exif_entry_get_value (e, value, sizeof(value)));
 350 }
 351
 352 #define CF(entry,target,v,maxlen)                                       \
 353 {                                                                       \
 354         if (entry->format != target) {                                  \
 355                 exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA,      \
 356                         _("The tag '%s' contains data of an invalid "   \
 357                         "format ('%s', expected '%s')."),               \
 358                         exif_tag_get_name (entry->tag),                 \
 359                         exif_format_get_name (entry->format),           \
 360                         exif_format_get_name (target));                 \
 361                 break;                                                  \
 362         }                                                               \
 363 }
 364
 365 #define CC(entry,target,v,maxlen)                                       \
 366 {                                                                       \
 367         if (entry->components != target) {                              \
 368                 exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA,      \
 369                         _("The tag '%s' contains an invalid number of " \
 370                           "components (%i, expected %i)."),             \
 371                         exif_tag_get_name (entry->tag),         \
 372                         (int) entry->components, (int) target);         \
 373                 break;                                                  \
 374         }                                                               \
 375 }
 376
 377 static struct {
 378         ExifTag tag;
 379         const char *strings[10];
 380 } list[] = {
 381   { EXIF_TAG_PLANAR_CONFIGURATION,
 382     { N_("chunky format"), N_("planar format"), NULL}},
 383   { EXIF_TAG_SENSING_METHOD,
 384     { "", N_("Not defined"), N_("One-chip color area sensor"),
 385       N_("Two-chip color area sensor"), N_("Three-chip color area sensor"),
 386       N_("Color sequential area sensor"), "", N_("Trilinear sensor"),
 387       N_("Color sequential linear sensor"), NULL}},
 388   { EXIF_TAG_ORIENTATION,
 389     { "", N_("top - left"), N_("top - right"), N_("bottom - right"),
 390       N_("bottom - left"), N_("left - top"), N_("right - top"),
 391       N_("right - bottom"), N_("left - bottom"), NULL}},
 392   { EXIF_TAG_YCBCR_POSITIONING,
 393     { "", N_("centered"), N_("co-sited"), NULL}},
 394   { EXIF_TAG_PHOTOMETRIC_INTERPRETATION, {"", N_("RGB"), N_("YCbCr"), NULL}},
 395   { EXIF_TAG_CUSTOM_RENDERED,
 396     { N_("Normal process"), N_("Custom process"), NULL}},
 397   { EXIF_TAG_EXPOSURE_MODE,
 398     { N_("Auto exposure"), N_("Manual exposure"), N_("Auto bracket"), NULL}},
 399   { EXIF_TAG_WHITE_BALANCE,
 400     { N_("Auto white balance"), N_("Manual white balance"), NULL}},
 401   { EXIF_TAG_SCENE_CAPTURE_TYPE,
 402     { N_("Standard"), N_("Landscape"), N_("Portrait"),
 403       N_("Night scene"), NULL}},
 404   { EXIF_TAG_GAIN_CONTROL,
 405     { N_("Normal"), N_("Low gain up"), N_("High gain up"),
 406       N_("Low gain down"), N_("High gain down"), NULL}},
 407   { EXIF_TAG_SATURATION,
 408     { N_("Normal"), N_("Low saturation"), N_("High saturation"), NULL}},
 409   { EXIF_TAG_CONTRAST , {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
 410   { EXIF_TAG_SHARPNESS, {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
 411   { 0, {NULL}}
 412 };
 413
 414 static struct {
 415   ExifTag tag;
 416   struct {
 417     int index;
 418     const char *values[4];
 419   } elem[25];
 420 } list2[] = {
 421   { EXIF_TAG_METERING_MODE,
 422     { {  0, {N_("Unknown"), NULL}},
 423       {  1, {N_("Average"), N_("avg"), NULL}},
 424       {  2, {N_("Center-Weighted Average"), N_("Center-Weight"), NULL}},
 425       {  3, {N_("Spot"), NULL}},
 426       {  4, {N_("Multi Spot"), NULL}},
 427       {  5, {N_("Pattern"), NULL}},
 428       {  6, {N_("Partial"), NULL}},
 429       {255, {N_("Other"), NULL}},
 430       {  0, {NULL}}}},
 431   { EXIF_TAG_COMPRESSION,
 432     { {1, {N_("Uncompressed"), NULL}},
 433       {5, {N_("LZW compression"), NULL}},
 434       {6, {N_("JPEG compression"), NULL}},
 435       {0, {NULL}}}},
 436   { EXIF_TAG_LIGHT_SOURCE,
 437     { {  0, {N_("Unknown"), NULL}},
 438       {  1, {N_("Daylight"), NULL}},
 439       {  2, {N_("Fluorescent"), NULL}},
 440       {  3, {N_("Tungsten incandescent light"), N_("Tungsten"), NULL}},
 441       {  4, {N_("Flash"), NULL}},
 442       {  9, {N_("Fine weather"), NULL}},
 443       { 10, {N_("Cloudy weather"), N_("cloudy"), NULL}},
 444       { 11, {N_("Shade"), NULL}},
 445       { 12, {N_("Daylight fluorescent"), NULL}},
 446       { 13, {N_("Day white fluorescent"), NULL}},
 447       { 14, {N_("Cool white fluorescent"), NULL}},
 448       { 15, {N_("White fluorescent"), NULL}},
 449       { 17, {N_("Standard light A"), NULL}},
 450       { 18, {N_("Standard light B"), NULL}},
 451       { 19, {N_("Standard light C"), NULL}},
 452       { 20, {N_("D55"), NULL}},
 453       { 21, {N_("D65"), NULL}},
 454       { 22, {N_("D75"), NULL}},
 455       { 24, {N_("ISO studio tungsten"),NULL}},
 456       {255, {N_("Other"), NULL}},
 457       {  0, {NULL}}}},
 458   { EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT,
 459     { {2, {N_("Inch"), N_("in"), NULL}},
 460       {3, {N_("Centimeter"), N_("cm"), NULL}},
 461       {0, {NULL}}}},
 462   { EXIF_TAG_RESOLUTION_UNIT,
 463     { {2, {N_("Inch"), N_("in"), NULL}},
 464       {3, {N_("Centimeter"), N_("cm"), NULL}},
 465       {0, {NULL}}}},
 466   { EXIF_TAG_EXPOSURE_PROGRAM,
 467     { {0, {N_("Not defined"), NULL}},
 468       {1, {N_("Manual"), NULL}},
 469       {2, {N_("Normal program"), N_("Normal"), NULL}},
 470       {3, {N_("Aperture priority"), N_("Aperture"), NULL}},
 471       {4, {N_("Shutter priority"),N_("Shutter"), NULL}},
 472       {5, {N_("Creative program (biased toward depth of field)"),
 473            N_("Creative"), NULL}},
 474       {6, {N_("Creative program (biased toward fast shutter speed"),
 475            N_("Action"), NULL}},
 476       {7, {N_("Portrait mode (for closeup photos with the background out "
 477               "of focus)"), N_("Portrait"), NULL}},
 478       {8, {N_("Landscape mode (for landscape photos with the background "
 479               "in focus)"), N_("Landscape"), NULL}},
 480       {0, {NULL}}}},
 481   { EXIF_TAG_FLASH,
 482     { {0x0000, {N_("Flash did not fire."), N_("no flash"), NULL}},
 483       {0x0001, {N_("Flash fired."), N_("flash"), N_("Yes"), NULL}},
 484       {0x0005, {N_("Strobe return light not detected."), N_("W/o strobe"),
 485                 NULL}},
 486       {0x0007, {N_("Strobe return light detected."), N_("W. strobe"), NULL}},
 487       {0x0009, {N_("Flash fired, compulsatory flash mode"), NULL}},
 488       {0x000d, {N_("Flash fired, compulsatory flash mode, return light "
 489                    "not detected."), NULL}},
 490       {0x000f, {N_("Flash fired, compulsatory flash mode, return light "
 491                    "detected."), NULL}},
 492       {0x0010, {N_("Flash did not fire, compulsatory flash mode."), NULL}},
 493       {0x0018, {N_("Flash did not fire, auto mode."), NULL}},
 494       {0x0019, {N_("Flash fired, auto mode."), NULL}},
 495       {0x001d, {N_("Flash fired, auto mode, return light not detected."),
 496                 NULL}},
 497       {0x001f, {N_("Flash fired, auto mode, return light detected."), NULL}},
 498       {0x0020, {N_("No flash function."),NULL}},
 499       {0x0041, {N_("Flash fired, red-eye reduction mode."), NULL}},
 500       {0x0045, {N_("Flash fired, red-eye reduction mode, return light "
 501                    "not detected."), NULL}},
 502       {0x0047, {N_("Flash fired, red-eye reduction mode, return light "
 503                    "detected."), NULL}},
 504       {0x0049, {N_("Flash fired, compulsory flash mode, red-eye reduction "
 505                    "mode."), NULL}},
 506       {0x004d, {N_("Flash fired, compulsory flash mode, red-eye reduction "
 507                   "mode, return light not detected"), NULL}},
 508       {0x004f, {N_("Flash fired, compulsory flash mode, red-eye reduction, "
 509                    "return light detected"), NULL}},
 510       {0x0058, {N_("Flash did not fire, auto mode, red-eye reduction mode"), NULL}},
 511       {0x0059, {N_("Flash fired, auto mode, red-eye reduction mode"), NULL}},
 512       {0x005d, {N_("Flash fired, auto mode, return light not detected, "
 513                    "red-eye reduction mode."), NULL}},
 514       {0x005f, {N_("Flash fired, auto mode, return light detected, "
 515                    "red-eye reduction mode."), NULL}},
 516       {0x0000, {NULL}}}},
 517   {EXIF_TAG_SUBJECT_DISTANCE_RANGE,
 518     { {0, {N_("Unknown"), N_("?"), NULL}},
 519       {1, {N_("Macro"), NULL}},
 520       {2, {N_("Close view"), N_("close"), NULL}},
 521       {3, {N_("Distant view"), N_("distant"), NULL}},
 522       {0, {NULL}}}},
 523   { EXIF_TAG_COLOR_SPACE,
 524     { {1, {N_("sRGB"), NULL}},
 525       {0xffff, {N_("Uncalibrated"), NULL}}}},
 526   {0, }
 527 };
 528
 529 const char *
 530 exif_entry_get_value (ExifEntry *e, char *val, unsigned int maxlen)
 531 {
 532         unsigned int i, j, k, l, ts;
 533         const unsigned char *t;
 534         ExifByte v_byte;
 535         ExifShort v_short, v_short2, v_short3, v_short4;
 536         ExifLong v_long;
 537         ExifSLong v_slong;
 538         ExifRational v_rat;
 539         ExifSRational v_srat;
 540         char b[64];
 541         const char *c;
 542         ExifByteOrder o;
 543         double d;
 544         ExifEntry *entry;
 545         static struct {
 546                 char *label;
 547                 char major, minor;
 548         } versions[] = {
 549                 {"0110", 1,  1},
 550                 {"0120", 1,  2},
 551                 {"0200", 2,  0},
 552                 {"0210", 2,  1},
 553                 {"0220", 2,  2},
 554                 {"0221", 2, 21},
 555                 {NULL  , 0,  0}
 556         };
 557
 558         /* FIXME: This belongs to somewhere else. */
 559         bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
 560         bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
 561
 562         /* We need the byte order */
 563         if (!e || !e->parent || !e->parent->parent)
 564                 return val;
 565         o = exif_data_get_byte_order (e->parent->parent);
 566
 567         memset (val, 0, maxlen);
 568         memset (b, 0, sizeof (b));
 569         maxlen--;
 570
 571         /* Sanity check */
 572         if (e->size != e->components * exif_format_get_size (e->format)) {
 573                 snprintf (val, maxlen, _("Invalid size of entry (%i, "
 574                         "expected %li x %i)."), e->size, e->components,
 575                                 exif_format_get_size (e->format));
 576                 return val;
 577         }
 578
 579         switch (e->tag) {
 580         case EXIF_TAG_USER_COMMENT:
 581
 582                 /*
 583                  * The specification says UNDEFINED, but some
 584                  * manufacturers don't care and use ASCII. If this is the
 585                  * case here, only refuse to read it if there is no chance
 586                  * of finding readable data.
 587                  */
 588                 if ((e->format != EXIF_FORMAT_ASCII) ||
 589                     (e->size <= 8) ||
 590                     ( memcmp (e->data, "ASCII\0\0\0"  , 8) &&
 591                       memcmp (e->data, "UNICODE\0"    , 8) &&
 592                       memcmp (e->data, "JIS\0\0\0\0\0", 8) &&
 593                       memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)))
 594                         CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 595
 596                 /*
 597                  * Note that, according to the specification (V2.1, p 40),
 598                  * the user comment field does not have to be
 599                  * NULL terminated.
 600                  */
 601                 if ((e->size >= 8) && !memcmp (e->data, "ASCII\0\0\0", 8)) {
 602                         strncpy (val, (char *) e->data + 8, MIN (e->size - 8, maxlen));
 603                         break;
 604                 }
 605                 if ((e->size >= 8) && !memcmp (e->data, "UNICODE\0", 8)) {
 606                         strncpy (val, _("Unsupported UNICODE string"), maxlen);
 607                         break;
 608                 }
 609                 if ((e->size >= 8) && !memcmp (e->data, "JIS\0\0\0\0\0", 8)) {
 610                         strncpy (val, _("Unsupported JIS string"), maxlen);
 611                         break;
 612                 }
 613
 614                 /* Check if there is really some information in the tag. */
 615                 for (i = 0; (i < e->size) &&
 616                             (!e->data[i] || (e->data[i] == ' ')); i++);
 617                 if (i == e->size) break;
 618
 619                 /*
 620                  * If we reach this point, the tag does not
 621                  * comply with the standard and seems to contain data.
 622                  * Print as much as possible.
 623                  */
 624                 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 625                         "Tag UserComment does not comply "
 626                         "with standard but contains data.");
 627                 for (; (i < e->size)  && (strlen (val) < maxlen - 1); i++) {
 628                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 629                                 "Byte at position %i: 0x%02x", i, e->data[i]);
 630                         val[strlen (val)] =
 631                                 isprint (e->data[i]) ? e->data[i] : '.';
 632                 }
 633                 break;
 634
 635         case EXIF_TAG_EXIF_VERSION:
 636                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 637                 CC (e, 4, val, maxlen);
 638                 strncpy (val, _("Unknown Exif Version"), maxlen);
 639                 for (i = 0; versions[i].label; i++) {
 640                         if (!memcmp (e->data, versions[i].label, 4)) {
 641                                 snprintf (val, maxlen,
 642                                         _("Exif Version %d.%d"),
 643                                         versions[i].major,
 644                                         versions[i].minor);
 645                                 break;
 646                         }
 647                 }
 648                 break;
 649         case EXIF_TAG_FLASH_PIX_VERSION:
 650                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 651                 CC (e, 4, val, maxlen);
 652                 if (!memcmp (e->data, "0100", 4))
 653                         strncpy (val, _("FlashPix Version 1.0"), maxlen);
 654                 else if (!memcmp (e->data, "0101", 4))
 655                         strncpy (val, _("FlashPix Version 1.01"), maxlen);
 656                 else
 657                         strncpy (val, _("Unknown FlashPix Version"), maxlen);
 658                 break;
 659         case EXIF_TAG_COPYRIGHT:
 660                 CF (e, EXIF_FORMAT_ASCII, val, maxlen);
 661
 662                 /*
 663                  * First part: Photographer.
 664                  * Some cameras store a string like "   " here. Ignore it.
 665                  */
 666                 if (e->size && e->data &&
 667                     (strspn (e->data, " ") != strlen ((char *) e->data)))
 668                         strncpy (val, (char *) e->data, MIN (maxlen, e->size));
 669                 else
 670                         strncpy (val, _("[None]"), maxlen);
 671                 strncat (val, " ", maxlen - strlen (val));
 672                 strncat (val, _("(Photographer)"), maxlen - strlen (val));
 673
 674                 /* Second part: Editor. */
 675                 t = e->data + strlen ((char *) e->data) + 1;
 676                 ts = e->data + e->size - t;
 677                 strncat (val, " - ", maxlen - strlen (val));
 678                 if (e->size && e->data && (ts > 0) &&
 679                     (strspn (t, " ") != ts))
 680                         strncat (val, t, MIN (maxlen - strlen (val), ts));
 681                 else
 682                         strncat (val, _("[None]"), maxlen - strlen (val));
 683                 strncat (val, " ", maxlen - strlen (val));
 684                 strncat (val, _("(Editor)"), maxlen - strlen (val));
 685
 686                 break;
 687         case EXIF_TAG_FNUMBER:
 688                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 689                 CC (e, 1, val, maxlen);
 690                 v_rat = exif_get_rational (e->data, o);
 691                 if (!v_rat.denominator) return val;
 692                 snprintf (val, maxlen, "f/%.01f", (float) v_rat.numerator /
 693                                                     (float) v_rat.denominator);
 694                 break;
 695         case EXIF_TAG_APERTURE_VALUE:
 696                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 697                 CC (e, 1, val, maxlen);
 698                 v_rat = exif_get_rational (e->data, o);
 699                 if (!v_rat.denominator) return val;
 700                 snprintf (val, maxlen, "f/%.01f",
 701                           pow (2 , ((float) v_rat.numerator /
 702                                     (float) v_rat.denominator) / 2.));
 703                 break;
 704         case EXIF_TAG_FOCAL_LENGTH:
 705                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 706                 CC (e, 1, val, maxlen);
 707                 v_rat = exif_get_rational (e->data, o);
 708                 if (!v_rat.denominator) return val;
 709
 710                 /*
 711                  * For calculation of the 35mm equivalent,
 712                  * Minolta cameras need a multiplier that depends on the
 713                  * camera model.
 714                  */
 715                 d = 0.;
 716                 entry = exif_content_get_entry (
 717                         e->parent->parent->ifd[EXIF_IFD_0], EXIF_TAG_MAKE);
 718                 if (entry && entry->data &&
 719                     !strncmp (entry->data, "Minolta", 7)) {
 720                         entry = exif_content_get_entry (
 721                                         e->parent->parent->ifd[EXIF_IFD_0],
 722                                         EXIF_TAG_MODEL);
 723                         if (entry && entry->data) {
 724                                 if (!strncmp (entry->data, "DiMAGE 7", 8))
 725                                         d = 3.9;
 726                                 else if (!strncmp (entry->data, "DiMAGE 5", 8))
 727                                         d = 4.9;
 728                         }
 729                 }
 730                 if (d)
 731                         snprintf (b, sizeof (b), _(" (35 equivalent: %d mm)"),
 732                                   (int) (d * (double) v_rat.numerator /
 733                                              (double) v_rat.denominator));
 734
 735                 snprintf (val, maxlen, "%.1f mm",
 736                         (float) v_rat.numerator / (float) v_rat.denominator);
 737                 if (maxlen > strlen (val) + strlen (b))
 738                         strncat (val, b, maxlen - strlen (val) - 1);
 739                 break;
 740         case EXIF_TAG_SUBJECT_DISTANCE:
 741                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 742                 CC (e, 1, val, maxlen);
 743                 v_rat = exif_get_rational (e->data, o);
 744                 if (!v_rat.denominator) return val;
 745                 snprintf (val, maxlen, "%.1f m", (float) v_rat.numerator /
 746                                                    (float) v_rat.denominator);
 747                 break;
 748         case EXIF_TAG_EXPOSURE_TIME:
 749                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 750                 CC (e, 1, val, maxlen);
 751                 v_rat = exif_get_rational (e->data, o);
 752                 if (!v_rat.denominator) return val;
 753                 d = (double) v_rat.numerator / (double) v_rat.denominator;
 754                 if (d < 1)
 755                         snprintf (val, maxlen, _("1/%d"),
 756                                   (int) (1. / d));
 757                 else
 758                         snprintf (val, maxlen, _("%d"), (int) d);
 759                 if (maxlen > strlen (val) + strlen (_(" sec.")))
 760                         strncat (val, _(" sec."), maxlen - strlen (val) - 1);
 761                 break;
 762         case EXIF_TAG_SHUTTER_SPEED_VALUE:
 763                 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
 764                 CC (e, 1, val, maxlen);
 765                 v_srat = exif_get_srational (e->data, o);
 766                 if (!v_srat.denominator) return val;
 767                 snprintf (val, maxlen, "%.0f/%.0f", (float) v_srat.numerator,
 768                           (float) v_srat.denominator);
 769                 if (maxlen > strlen (val) + strlen (_(" sec.")))
 770                         strncat (val, _(" sec."), maxlen - strlen (val) - 1);
 771                 snprintf (b, sizeof (b), " (APEX: %i)",
 772                         (int) pow (sqrt(2), (float) v_srat.numerator /
 773                                             (float) v_srat.denominator));
 774                 if (maxlen > strlen (val) + strlen (b))
 775                         strncat (val, b, maxlen - strlen (val) - 1);
 776                 break;
 777         case EXIF_TAG_BRIGHTNESS_VALUE:
 778                 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
 779                 CC (e, 1, val, maxlen);
 780                 v_srat = exif_get_srational (e->data, o);
 781                 snprintf (val, maxlen, "%i/%i", (int) v_srat.numerator,
 782                                                   (int) v_srat.denominator);
 783                 /* FIXME: How do I calculate the APEX value? */
 784                 break;
 785         case EXIF_TAG_FILE_SOURCE:
 786                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 787                 CC (e, 1, val, maxlen);
 788                 switch (e->data[0]) {
 789                 case 0x03: strncpy (val, _("DSC"), maxlen); break;
 790                 default: snprintf (val, maxlen, "0x%02x", e->data[0]); break;
 791                 }
 792                 break;
 793         case EXIF_TAG_COMPONENTS_CONFIGURATION:
 794                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 795                 CC (e, 4, val, maxlen);
 796                 for (i = 0; i < 4; i++) {
 797                         switch (e->data[i]) {
 798                         case 0: c = _("-"); break;
 799                         case 1: c = _("Y"); break;
 800                         case 2: c = _("Cb"); break;
 801                         case 3: c = _("Cr"); break;
 802                         case 4: c = _("R"); break;
 803                         case 5: c = _("G"); break;
 804                         case 6: c = _("B"); break;
 805                         default: c = _("reserved"); break;
 806                         }
 807                         strncat (val, c, maxlen - strlen (val));
 808                         if (i < 3) strncat (val, " ", maxlen - strlen (val));
 809                 }
 810                 break;
 811         case EXIF_TAG_EXPOSURE_BIAS_VALUE:
 812                 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
 813                 CC (e, 1, val, maxlen);
 814                 v_srat = exif_get_srational (e->data, o);
 815                 if (!v_srat.denominator) return val;
 816                 snprintf (val, maxlen, "%s%.01f",
 817                           v_srat.denominator * v_srat.numerator > 0 ? "+" : "",
 818                           (double) v_srat.numerator /
 819                           (double) v_srat.denominator);
 820                 break;
 821         case EXIF_TAG_YCBCR_SUB_SAMPLING:
 822                 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
 823                 CC (e, 2, val, maxlen);
 824                 v_short  = exif_get_short (e->data, o);
 825                 v_short2 = exif_get_short (
 826                         e->data + exif_format_get_size (e->format),
 827                         o);
 828                 if ((v_short == 2) && (v_short2 == 1))
 829                         strncpy (val, _("YCbCr4:2:2"), maxlen);
 830                 else if ((v_short == 2) && (v_short2 == 2))
 831                         strncpy (val, _("YCbCr4:2:0"), maxlen);
 832                 else
 833                         snprintf (val, maxlen, "%i, %i", v_short, v_short2);
 834                 break;
 835         case EXIF_TAG_MAKER_NOTE:
 836                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 837                 snprintf (val, maxlen, _("%i bytes unknown data"),
 838                           (int) e->components);
 839                 break;
 840         case EXIF_TAG_SUBJECT_AREA:
 841                 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
 842                 switch (e->components) {
 843                 case 2:
 844                         v_short  = exif_get_short (e->data, o);
 845                         v_short2 = exif_get_short (e->data + 2, o);
 846                         snprintf (val, maxlen, "(x,y) = (%i,%i)",
 847                                   v_short, v_short2);
 848                         break;
 849                 case 3:
 850                         v_short  = exif_get_short (e->data, o);
 851                         v_short2 = exif_get_short (e->data + 2, o);
 852                         v_short3 = exif_get_short (e->data + 4, o);
 853                         snprintf (val, maxlen, _("Within distance %i of "
 854                                 "(x,y) = (%i,%i)"), v_short3, v_short,
 855                                 v_short2);
 856                         break;
 857                 case 4:
 858                         v_short  = exif_get_short (e->data, o);
 859                         v_short2 = exif_get_short (e->data + 2, o);
 860                         v_short3 = exif_get_short (e->data + 4, o);
 861                         v_short4 = exif_get_short (e->data + 6, o);
 862                         snprintf (val, maxlen, _("Within rectangle "
 863                                 "(width %i, height %i) around "
 864                                 "(x,y) = (%i,%i)"), v_short3, v_short4,
 865                                 v_short, v_short2);
 866                         break;
 867                 default:
 868                         snprintf (val, maxlen, _("Unexpected number "
 869                                 "of components (%li, expected 2, 3, or 4)."),
 870                                 e->components);
 871                 }
 872                 break;
 873
 874         case EXIF_TAG_METERING_MODE:
 875         case EXIF_TAG_COMPRESSION:
 876         case EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT:
 877         case EXIF_TAG_RESOLUTION_UNIT:
 878         case EXIF_TAG_EXPOSURE_PROGRAM:
 879         case EXIF_TAG_FLASH:
 880         case EXIF_TAG_SUBJECT_DISTANCE_RANGE:
 881         case EXIF_TAG_COLOR_SPACE:
 882                 CF (e,EXIF_FORMAT_SHORT, val, maxlen);
 883                 CC (e, 1, val, maxlen);
 884                 v_short = exif_get_short (e->data, o);
 885
 886                 /* Search the tag */
 887                 for (i = 0; list2[i].tag && (list2[i].tag != e->tag); i++);
 888                 if (!list2[i].tag) {
 889                         strncpy (val, "Internal error.", maxlen - 1);
 890                         break;
 891                 }
 892
 893                 /* Find the value */
 894                 for (j = 0; list2[i].elem[j].values &&
 895                             (list2[i].elem[j].index < v_short); j++);
 896                 if (list2[i].elem[j].index != v_short) {
 897                         snprintf (val, maxlen, "Internal error (unknown "
 898                                   "value %i).", v_short);
 899                         break;
 900                 }
 901
 902                 /* Find a short enough value */
 903                 memset (val, 0, maxlen);
 904                 for (k = 0; list2[i].elem[j].values &&
 905                             list2[i].elem[j].values[k]; k++) {
 906                   l = strlen (_(list2[i].elem[j].values[k]));
 907                   if ((maxlen > l) && (strlen (val) < l))
 908                     strncpy (val, _(list2[i].elem[j].values[k]), maxlen - 1);
 909                 }
 910                 if (!strlen (val)) snprintf (val, maxlen, "%i", v_short);
 911
 912                 break;
 913         case EXIF_TAG_PLANAR_CONFIGURATION:
 914         case EXIF_TAG_SENSING_METHOD:
 915         case EXIF_TAG_ORIENTATION:
 916         case EXIF_TAG_YCBCR_POSITIONING:
 917         case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
 918         case EXIF_TAG_CUSTOM_RENDERED:
 919         case EXIF_TAG_EXPOSURE_MODE:
 920         case EXIF_TAG_WHITE_BALANCE:
 921         case EXIF_TAG_SCENE_CAPTURE_TYPE:
 922         case EXIF_TAG_GAIN_CONTROL:
 923         case EXIF_TAG_SATURATION:
 924         case EXIF_TAG_CONTRAST:
 925         case EXIF_TAG_SHARPNESS:
 926                 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
 927                 CC (e, 1, val, maxlen);
 928                 v_short = exif_get_short (e->data, o);
 929
 930                 /* Search the tag */
 931                 for (i = 0; list[i].tag && (list[i].tag != e->tag); i++);
 932                 if (!list[i].tag) {
 933                         strncpy (val, "Internal error.", maxlen - 1);
 934                         break;
 935                 }
 936
 937                 /* Find the value */
 938                 for (j = 0; list[i].strings[j] && (j < v_short); j++);
 939                 if (!list[i].strings[j])
 940                         snprintf (val, maxlen, "%i", v_short);
 941                 else
 942                         strncpy (val, _(list[i].strings[j]), maxlen - 1);
 943                 break;
 944         default:
 945                 if (!e->components) break;
 946                 switch (e->format) {
 947                 case EXIF_FORMAT_UNDEFINED:
 948                         break;
 949                 case EXIF_FORMAT_BYTE:
 950                 case EXIF_FORMAT_SBYTE:
 951                         v_byte = e->data[0];
 952                         snprintf (val, maxlen, "0x%02x", v_byte);
 953                         maxlen -= strlen (val);
 954                         for (i = 1; i < e->components; i++) {
 955                                 v_byte = e->data[i];
 956                                 snprintf (b, sizeof (b), ", 0x%02x", v_byte);
 957                                 strncat (val, b, maxlen);
 958                                 maxlen -= strlen (b);
 959                                 if ((signed)maxlen <= 0) break;
 960                         }
 961                         break;
 962                 case EXIF_FORMAT_SHORT:
 963                 case EXIF_FORMAT_SSHORT:
 964                         v_short = exif_get_short (e->data, o);
 965                         snprintf (val, maxlen, "%i", v_short);
 966                         maxlen -= strlen (val);
 967                         for (i = 1; i < e->components; i++) {
 968                                 v_short = exif_get_short (e->data +
 969                                         exif_format_get_size (e->format) *
 970                                         i, o);
 971                                 snprintf (b, sizeof (b), ", %i", v_short);
 972                                 strncat (val, b, maxlen);
 973                                 maxlen -= strlen (b);
 974                                 if ((signed)maxlen <= 0) break;
 975                         }
 976                         break;
 977                 case EXIF_FORMAT_LONG:
 978                         v_long = exif_get_long (e->data, o);
 979                         snprintf (val, maxlen, "%li", (long int) v_long);
 980                         maxlen -= strlen (val);
 981                         for (i = 1; i < e->components; i++) {
 982                                 v_long = exif_get_long (e->data +
 983                                         exif_format_get_size (e->format) *
 984                                         i, o);
 985                                 snprintf (b, sizeof (b), ", %li",
 986                                         (long int) v_long);
 987                                 strncat (val, b, maxlen);
 988                                 maxlen -= strlen (b);
 989                                 if ((signed)maxlen <= 0) break;
 990                         }
 991                         break;
 992                 case EXIF_FORMAT_SLONG:
 993                         v_slong = exif_get_slong (e->data, o);
 994                         snprintf (val, maxlen, "%li", (long int) v_slong);
 995                         maxlen -= strlen (val);
 996                         for (i = 1; i < e->components; i++) {
 997                                 v_long = exif_get_slong (e->data +
 998                                         exif_format_get_size (e->format) *
 999                                         i, o);
1000                                 snprintf (b, sizeof (b), ", %li",
1001                                                 (long int) v_long);
1002                                 strncat (val, b, maxlen);
1003                                 maxlen -= strlen (b);
1004                                 if ((signed)maxlen <= 0) break;
1005                         }
1006                         break;
1007                 case EXIF_FORMAT_ASCII:
1008                         strncpy (val, (char *) e->data, MIN (maxlen, e->size));
1009                         break;
1010                 case EXIF_FORMAT_RATIONAL:
1011                         v_rat = exif_get_rational (e->data, o);
1012                         if (v_rat.denominator) {
1013                                 snprintf (val, maxlen, "%2.2f", (double)v_rat.numerator / v_rat.denominator);
1014                         } else {
1015                                 snprintf (val, maxlen, "%i/%i", v_rat.numerator,  v_rat.denominator);
1016                         }
1017                         maxlen -= strlen (val);
1018                         for (i = 1; i < e->components; i++) {
1019                                 v_rat = exif_get_rational (
1020                                         e->data + 8 * i, o);
1021                                 snprintf (b, sizeof (b), ", %2.2f",
1022                                            (double)v_rat.numerator / v_rat.denominator);
1023                                 strncat (val, b, maxlen);
1024                                 maxlen -= strlen (b);
1025                                 if ((signed)maxlen <= 0) break;
1026                         }
1027                         break;
1028                 case EXIF_FORMAT_SRATIONAL:
1029                         v_srat = exif_get_srational (e->data, o);
1030                         if (v_srat.denominator) {
1031                                 snprintf (val, maxlen, "%2.2f", (double)v_srat.numerator / v_srat.denominator);
1032                         } else {
1033                                 snprintf (val, maxlen, "%i/%i", v_srat.numerator,  v_srat.denominator);
1034                         }
1035                         maxlen -= strlen (val);
1036                         for (i = 1; i < e->components; i++) {
1037                                 v_srat = exif_get_srational (
1038                                         e->data + 8 * i, o);
1039                                 snprintf (b, sizeof (b), ", %2.2f",
1040                                           (double)v_srat.numerator / v_srat.denominator);
1041                                 strncat (val, b, maxlen);
1042                                 maxlen -= strlen (b);
1043                                 if ((signed) maxlen <= 0) break;
1044                         }
1045                         break;
1046                 case EXIF_FORMAT_DOUBLE:
1047                 case EXIF_FORMAT_FLOAT:
1048                 default:
1049                         /* What to do here? */
1050                         break;
1051                 }
1052         }
1053
1054         return val;
1055 }
1056
1057 void
1058 exif_entry_initialize (ExifEntry *e, ExifTag tag)
1059 {
1060         time_t t;
1061         struct tm *tm;
1062         ExifRational r;
1063         ExifByteOrder o;
1064
1065         /* We need the byte order */
1066         if (!e || !e->parent || e->data || !e->parent->parent)
1067                 return;
1068         o = exif_data_get_byte_order (e->parent->parent);
1069
1070         e->tag = tag;
1071         switch (tag) {
1072
1073         /* LONG, 1 component, no default */
1074         case EXIF_TAG_PIXEL_X_DIMENSION:
1075         case EXIF_TAG_PIXEL_Y_DIMENSION:
1076         case EXIF_TAG_EXIF_IFD_POINTER:
1077         case EXIF_TAG_GPS_INFO_IFD_POINTER:
1078         case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
1079         case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
1080         case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
1081                 e->components = 1;
1082                 e->format = EXIF_FORMAT_LONG;
1083                 e->size = exif_format_get_size (e->format) * e->components;
1084                 e->data = exif_entry_alloc (e, e->size);
1085                 break;
1086
1087         /* SHORT, 1 component, no default */
1088         case EXIF_TAG_SUBJECT_LOCATION:
1089         case EXIF_TAG_SENSING_METHOD:
1090         case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
1091         case EXIF_TAG_COMPRESSION:
1092         case EXIF_TAG_EXPOSURE_MODE:
1093         case EXIF_TAG_WHITE_BALANCE:
1094         case EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM:
1095         case EXIF_TAG_GAIN_CONTROL:
1096         case EXIF_TAG_SUBJECT_DISTANCE_RANGE:
1097
1098         /* SHORT, 1 component, default 0 */
1099         case EXIF_TAG_IMAGE_WIDTH:
1100         case EXIF_TAG_IMAGE_LENGTH:
1101         case EXIF_TAG_EXPOSURE_PROGRAM:
1102         case EXIF_TAG_LIGHT_SOURCE:
1103         case EXIF_TAG_METERING_MODE:
1104         case EXIF_TAG_CUSTOM_RENDERED:
1105         case EXIF_TAG_SCENE_CAPTURE_TYPE:
1106         case EXIF_TAG_CONTRAST:
1107         case EXIF_TAG_SATURATION:
1108         case EXIF_TAG_SHARPNESS:
1109                 e->components = 1;
1110                 e->format = EXIF_FORMAT_SHORT;
1111                 e->size = exif_format_get_size (e->format) * e->components;
1112                 e->data = exif_entry_alloc (e, e->size);
1113                 exif_set_short (e->data, o, 0);
1114                 break;
1115
1116         /* SHORT, 1 component, default 1 */
1117     case EXIF_TAG_ORIENTATION:
1118     case EXIF_TAG_PLANAR_CONFIGURATION:
1119     case EXIF_TAG_YCBCR_POSITIONING:
1120                 e->components = 1;
1121                 e->format = EXIF_FORMAT_SHORT;
1122                 e->size = exif_format_get_size (e->format) * e->components;
1123                 e->data = exif_entry_alloc (e, e->size);
1124                 exif_set_short (e->data, o, 1);
1125                 break;
1126
1127         /* SHORT, 1 component, default 2 */
1128     case EXIF_TAG_RESOLUTION_UNIT:
1129         case EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT:
1130                 e->components = 1;
1131                 e->format = EXIF_FORMAT_SHORT;
1132                 e->size = exif_format_get_size (e->format) * e->components;
1133                 e->data = exif_entry_alloc (e, e->size);
1134                 exif_set_short (e->data, o, 2);
1135                 break;
1136
1137         /* SHORT, 1 component, default 3 */
1138     case EXIF_TAG_SAMPLES_PER_PIXEL:
1139                 e->components = 1;
1140                 e->format = EXIF_FORMAT_SHORT;
1141                 e->size = exif_format_get_size (e->format) * e->components;
1142                 e->data = exif_entry_alloc (e, e->size);
1143                 exif_set_short (e->data, o, 3);
1144                 break;
1145
1146         case EXIF_TAG_BITS_PER_SAMPLE:
1147                 e->components = 3;
1148                 e->format = EXIF_FORMAT_SHORT;
1149                 e->size = exif_format_get_size (e->format) * e->components;
1150                 e->data = exif_entry_alloc (e, e->size);
1151                 if (!e->data) break;
1152                 exif_set_short (e->data, o, 8);
1153                 exif_set_short (
1154                         e->data + exif_format_get_size (e->format),
1155                         o, 8);
1156                 exif_set_short (
1157                         e->data + 2 * exif_format_get_size (e->format),
1158                         o, 8);
1159                 break;
1160         case EXIF_TAG_YCBCR_SUB_SAMPLING:
1161                 e->components = 2;
1162                 e->format = EXIF_FORMAT_SHORT;
1163                 e->size = exif_format_get_size (e->format) * e->components;
1164                 e->data = exif_entry_alloc (e, e->size);
1165                 if (!e->data) break;
1166                 exif_set_short (e->data, o, 2);
1167                 exif_set_short (
1168                         e->data + exif_format_get_size (e->format),
1169                         o, 1);
1170                 break;
1171
1172         /* SRATIONAL, 1 component, no default */
1173         case EXIF_TAG_EXPOSURE_BIAS_VALUE:
1174         case EXIF_TAG_BRIGHTNESS_VALUE:
1175         case EXIF_TAG_SHUTTER_SPEED_VALUE:
1176                 e->components = 1;
1177                 e->format = EXIF_FORMAT_SRATIONAL;
1178                 e->size = exif_format_get_size (e->format) * e->components;
1179                 e->data = exif_entry_alloc (e, e->size);
1180                 break;
1181
1182         /* RATIONAL, 1 component, no default */
1183         case EXIF_TAG_EXPOSURE_TIME:
1184         case EXIF_TAG_FOCAL_PLANE_X_RESOLUTION:
1185         case EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION:
1186         case EXIF_TAG_EXPOSURE_INDEX:
1187         case EXIF_TAG_FLASH_ENERGY:
1188         case EXIF_TAG_FNUMBER:
1189         case EXIF_TAG_FOCAL_LENGTH:
1190         case EXIF_TAG_SUBJECT_DISTANCE:
1191         case EXIF_TAG_MAX_APERTURE_VALUE:
1192         case EXIF_TAG_APERTURE_VALUE:
1193         case EXIF_TAG_COMPRESSED_BITS_PER_PIXEL:
1194         case EXIF_TAG_PRIMARY_CHROMATICITIES:
1195         case EXIF_TAG_DIGITAL_ZOOM_RATIO:
1196                 e->components = 1;
1197                 e->format = EXIF_FORMAT_RATIONAL;
1198                 e->size = exif_format_get_size (e->format) * e->components;
1199                 e->data = exif_entry_alloc (e, e->size);
1200                 break;
1201
1202         /* RATIONAL, 1 component, default 72/1 */
1203         case EXIF_TAG_X_RESOLUTION:
1204         case EXIF_TAG_Y_RESOLUTION:
1205                 e->components = 1;
1206                 e->format = EXIF_FORMAT_RATIONAL;
1207                 e->size = exif_format_get_size (e->format) * e->components;
1208                 e->data = exif_entry_alloc (e, e->size);
1209                 r.numerator = 72;
1210                 r.denominator = 1;
1211                 exif_set_rational (e->data, o, r);
1212                 break;
1213
1214         /* RATIONAL, 2 components, no default */
1215         case EXIF_TAG_WHITE_POINT:
1216                 e->components = 2;
1217                 e->format = EXIF_FORMAT_RATIONAL;
1218                 e->size = exif_format_get_size (e->format) * e->components;
1219                 e->data = exif_entry_alloc (e, e->size);
1220                 break;
1221
1222         /* RATIONAL, 6 components */
1223         case EXIF_TAG_REFERENCE_BLACK_WHITE:
1224                 e->components = 6;
1225                 e->format = EXIF_FORMAT_RATIONAL;
1226                 e->size = exif_format_get_size (e->format) * e->components;
1227                 e->data = exif_entry_alloc (e, e->size);
1228                 if (!e->data) break;
1229                 r.denominator = 1;
1230                 r.numerator = 0;
1231                 exif_set_rational (e->data, o, r);
1232                 r.numerator = 255;
1233                 exif_set_rational (
1234                         e->data + exif_format_get_size (e->format), o, r);
1235                 r.numerator = 0;
1236                 exif_set_rational (
1237                         e->data + 2 * exif_format_get_size (e->format), o, r);
1238                 r.numerator = 255;
1239                 exif_set_rational (
1240                         e->data + 3 * exif_format_get_size (e->format), o, r);
1241                 r.numerator = 0;
1242                 exif_set_rational (
1243                         e->data + 4 * exif_format_get_size (e->format), o, r);
1244                 r.numerator = 255;
1245                 exif_set_rational (
1246                         e->data + 5 * exif_format_get_size (e->format), o, r);
1247                 break;
1248
1249         /* ASCII, 20 components */
1250         case EXIF_TAG_DATE_TIME:
1251         case EXIF_TAG_DATE_TIME_ORIGINAL:
1252         case EXIF_TAG_DATE_TIME_DIGITIZED:
1253                 t = time (NULL);
1254                 tm = localtime (&t);
1255                 e->components = 20;
1256                 e->format = EXIF_FORMAT_ASCII;
1257                 e->size = exif_format_get_size (e->format) * e->components;
1258                 e->data = exif_entry_alloc (e, e->size);
1259                 if (!e->data) break;
1260                 snprintf ((char *) e->data, e->size,
1261                           "%04i:%02i:%02i %02i:%02i:%02i",
1262                           tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1263                           tm->tm_hour, tm->tm_min, tm->tm_sec);
1264                 break;
1265
1266         /* ASCII, no default */
1267         case EXIF_TAG_SUB_SEC_TIME:
1268         case EXIF_TAG_SUB_SEC_TIME_ORIGINAL:
1269         case EXIF_TAG_SUB_SEC_TIME_DIGITIZED:
1270                 e->components = 0;
1271                 e->format = EXIF_FORMAT_ASCII;
1272                 e->size = 0;
1273                 e->data = NULL;
1274                 break;
1275         case EXIF_TAG_IMAGE_DESCRIPTION:
1276         case EXIF_TAG_MAKE:
1277         case EXIF_TAG_MODEL:
1278         case EXIF_TAG_SOFTWARE:
1279         case EXIF_TAG_ARTIST:
1280                 e->components = strlen (_("[None]")) + 1;
1281                 e->format = EXIF_FORMAT_ASCII;
1282                 e->size = exif_format_get_size (e->format) * e->components;
1283                 e->data = exif_entry_alloc (e, e->size);
1284                 if (!e->data) break;
1285                 strncpy (e->data, _("[None]"), e->size);
1286                 break;
1287         case EXIF_TAG_COPYRIGHT:
1288                 e->components = (strlen (_("[None]")) + 1) * 2;
1289                 e->format = EXIF_FORMAT_ASCII;
1290                 e->size = exif_format_get_size (e->format) * e->components;
1291                 e->data = exif_entry_alloc (e, e->size);
1292                 if (!e->data) break;
1293                 strcpy (e->data + 0, _("[None]"));
1294                 strcpy (e->data + strlen (_("[None]")) + 1, _("[None]"));
1295                 break;
1296
1297         /* UNDEFINED, no components, no default */
1298         case EXIF_TAG_MAKER_NOTE:
1299         case EXIF_TAG_USER_COMMENT:
1300                 e->components = 0;
1301                 e->format = EXIF_FORMAT_UNDEFINED;
1302                 e->size = 0;
1303                 e->data = NULL;
1304                 break;
1305
1306         /* UNDEFINED, 1 component, default 1 */
1307         case EXIF_TAG_SCENE_TYPE:
1308                 e->components = 1;
1309                 e->format = EXIF_FORMAT_UNDEFINED;
1310                 e->size = exif_format_get_size (e->format) * e->components;
1311                 e->data = exif_entry_alloc (e, e->size);
1312                 if (!e->data) break;
1313                 e->data[0] = 0x01;
1314                 break;
1315
1316         /* UNDEFINED, 1 component, default 3 */
1317         case EXIF_TAG_FILE_SOURCE:
1318                 e->components = 1;
1319                 e->format = EXIF_FORMAT_UNDEFINED;
1320                 e->size = exif_format_get_size (e->format) * e->components;
1321                 e->data = exif_entry_alloc (e, e->size);
1322                 if (!e->data) break;
1323                 e->data[0] = 0x03;
1324                 break;
1325
1326         /* UNDEFINED, 4 components, default 0 1 0 0 */
1327         case EXIF_TAG_FLASH_PIX_VERSION:
1328                 e->components = 4;
1329                 e->format = EXIF_FORMAT_UNDEFINED;
1330                 e->size = exif_format_get_size (e->format) * e->components;
1331                 e->data = exif_entry_alloc (e, e->size);
1332                 if (!e->data) break;
1333                 memcpy (e->data, "0100", 4);
1334                 break;
1335
1336         /* UNDEFINED, 4 components, default 0 2 1 0 */
1337         case EXIF_TAG_EXIF_VERSION:
1338                 e->components = 4;
1339                 e->format = EXIF_FORMAT_UNDEFINED;
1340                 e->size = exif_format_get_size (e->format) * e->components;
1341                 e->data = exif_entry_alloc (e, e->size);
1342                 if (!e->data) break;
1343                 memcpy (e->data, "0210", 4);
1344                 break;
1345
1346         default:
1347                 break;
1348         }
1349 }