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 #undef  MIN
  36 #define MIN(a, b)  (((a) < (b)) ? (a) : (b))
  37
  38 struct _ExifEntryPrivate
  39 {
  40         unsigned int ref_count;
  41
  42         ExifMem *mem;
  43 };
  44
  45 /* This function is hidden in exif-data.c */
  46 ExifLog *exif_data_get_log (ExifData *);
  47
  48 static void
  49 exif_entry_log (ExifEntry *e, ExifLogCode code, const char *format, ...)
  50 {
  51         va_list args;
  52         ExifLog *l = NULL;
  53
  54         if (e && e->parent && e->parent->parent)
  55                 l = exif_data_get_log (e->parent->parent);
  56         va_start (args, format);
  57         exif_logv (l, code, "ExifEntry", format, args);
  58         va_end (args);
  59 }
  60
  61 static void *
  62 exif_entry_alloc (ExifEntry *e, unsigned int i)
  63 {
  64         void *d;
  65         ExifLog *l = NULL;
  66
  67         if (!e || !e->priv || !i) return NULL;
  68
  69         d = exif_mem_alloc (e->priv->mem, i);
  70         if (d) return d;
  71
  72         if (e->parent && e->parent->parent)
  73                 l = exif_data_get_log (e->parent->parent);
  74         EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
  75         return NULL;
  76 }
  77
  78 static void *
  79 exif_entry_realloc (ExifEntry *e, void *d_orig, unsigned int i)
  80 {
  81         void *d;
  82         ExifLog *l = NULL;
  83
  84         if (!e || !e->priv) return NULL;
  85
  86         if (!i) { exif_mem_free (e->priv->mem, d_orig); return NULL; }
  87
  88         d = exif_mem_realloc (e->priv->mem, d_orig, i);
  89         if (d) return d;
  90
  91         if (e->parent && e->parent->parent)
  92                 l = exif_data_get_log (e->parent->parent);
  93         EXIF_LOG_NO_MEMORY (l, "ExifEntry", i);
  94         return NULL;
  95 }
  96
  97 ExifEntry *
  98 exif_entry_new (void)
  99 {
 100         ExifMem *mem = exif_mem_new_default ();
 101         ExifEntry *e = exif_entry_new_mem (mem);
 102
 103         exif_mem_unref (mem);
 104
 105         return e;
 106 }
 107
 108 ExifEntry *
 109 exif_entry_new_mem (ExifMem *mem)
 110 {
 111         ExifEntry *e = NULL;
 112
 113         e = exif_mem_alloc (mem, sizeof (ExifEntry));
 114         if (!e) return NULL;
 115         e->priv = exif_mem_alloc (mem, sizeof (ExifEntryPrivate));
 116         if (!e->priv) { exif_mem_free (mem, e); return NULL; }
 117         e->priv->ref_count = 1;
 118
 119         e->priv->mem = mem;
 120         exif_mem_ref (mem);
 121
 122         return e;
 123 }
 124
 125 void
 126 exif_entry_ref (ExifEntry *e)
 127 {
 128         if (!e) return;
 129
 130         e->priv->ref_count++;
 131 }
 132
 133 void
 134 exif_entry_unref (ExifEntry *e)
 135 {
 136         if (!e) return;
 137
 138         e->priv->ref_count--;
 139         if (!e->priv->ref_count)
 140                 exif_entry_free (e);
 141 }
 142
 143 void
 144 exif_entry_free (ExifEntry *e)
 145 {
 146         if (!e) return;
 147
 148         if (e->priv) {
 149                 ExifMem *mem = e->priv->mem;
 150                 if (e->data)
 151                         exif_mem_free (mem, e->data);
 152                 exif_mem_free (mem, e->priv);
 153                 exif_mem_free (mem, e);
 154                 exif_mem_unref (mem);
 155         }
 156 }
 157
 158 void
 159 exif_entry_fix (ExifEntry *e)
 160 {
 161         unsigned int i;
 162         ExifByteOrder o;
 163         ExifRational r;
 164         ExifSRational sr;
 165
 166         if (!e || !e->priv) return;
 167
 168         switch (e->tag) {
 169
 170         /* These tags all need to be of format SHORT. */
 171         case EXIF_TAG_YCBCR_SUB_SAMPLING:
 172         case EXIF_TAG_SUBJECT_AREA:
 173         case EXIF_TAG_COLOR_SPACE:
 174         case EXIF_TAG_PLANAR_CONFIGURATION:
 175         case EXIF_TAG_SENSING_METHOD:
 176         case EXIF_TAG_ORIENTATION:
 177         case EXIF_TAG_YCBCR_POSITIONING:
 178         case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
 179         case EXIF_TAG_CUSTOM_RENDERED:
 180         case EXIF_TAG_EXPOSURE_MODE:
 181         case EXIF_TAG_WHITE_BALANCE:
 182         case EXIF_TAG_SCENE_CAPTURE_TYPE:
 183         case EXIF_TAG_GAIN_CONTROL:
 184         case EXIF_TAG_SATURATION:
 185         case EXIF_TAG_CONTRAST:
 186         case EXIF_TAG_SHARPNESS:
 187                 switch (e->format) {
 188                 case EXIF_FORMAT_LONG:
 189                         if (!e->parent || !e->parent->parent) break;
 190                         o = exif_data_get_byte_order (e->parent->parent);
 191                         for (i = 0; i < e->components; i++)
 192                                 exif_set_short (
 193                                         e->data + i *
 194                                         exif_format_get_size (
 195                                         EXIF_FORMAT_SHORT), o,
 196                                         (ExifShort) exif_get_long (
 197                                         e->data + i *
 198                                         exif_format_get_size (
 199                                         EXIF_FORMAT_LONG), o));
 200                         e->format = EXIF_FORMAT_SHORT;
 201                         e->size = e->components *
 202                                 exif_format_get_size (e->format);
 203                         e->data = exif_entry_realloc (e, e->data, e->size);
 204                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 205                                 "Tag '%s' was of format '%s' (which is "
 206                                 "against specification) and has been "
 207                                 "changed to format '%s'.",
 208                                 exif_tag_get_name (e->tag),
 209                                 exif_format_get_name (EXIF_FORMAT_LONG),
 210                                 exif_format_get_name (EXIF_FORMAT_SHORT));
 211                         break;
 212                 case EXIF_FORMAT_SHORT:
 213                 default:
 214                         break;
 215                 }
 216                 break;
 217
 218         /* All these tags need to be of format 'Rational'. */
 219         case EXIF_TAG_FNUMBER:
 220         case EXIF_TAG_APERTURE_VALUE:
 221         case EXIF_TAG_EXPOSURE_TIME:
 222         case EXIF_TAG_FOCAL_LENGTH:
 223                 switch (e->format) {
 224                 case EXIF_FORMAT_SRATIONAL:
 225                         if (!e->parent || !e->parent->parent) break;
 226                         o = exif_data_get_byte_order (e->parent->parent);
 227                         for (i = 0; i < e->components; i++) {
 228                                 sr = exif_get_srational (e->data + i *
 229                                         exif_format_get_size (
 230                                                 EXIF_FORMAT_SRATIONAL), o);
 231                                 r.numerator = (ExifLong) sr.numerator;
 232                                 r.denominator = (ExifLong) sr.denominator;
 233                                 exif_set_rational (e->data + i *
 234                                         exif_format_get_size (
 235                                                 EXIF_FORMAT_RATIONAL), o, r);
 236                         }
 237                         e->format = EXIF_FORMAT_RATIONAL;
 238                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 239                                 "Tag '%s' was of format '%s' (which is "
 240                                 "against specification) and has been "
 241                                 "changed to format '%s'.",
 242                                 exif_tag_get_name (e->tag),
 243                                 exif_format_get_name (EXIF_FORMAT_SRATIONAL),
 244                                 exif_format_get_name (EXIF_FORMAT_RATIONAL));
 245                         break;
 246                 default:
 247                         break;
 248                 }
 249                 break;
 250
 251         case EXIF_TAG_USER_COMMENT:
 252
 253                 /* Format needs to be UNDEFINED. */
 254                 if (e->format != EXIF_FORMAT_UNDEFINED) {
 255                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 256                                 "Tag 'UserComment' had invalid format '%s'. "
 257                                 "Format has been set to 'undefined'.",
 258                                 exif_format_get_name (e->format));
 259                         e->format = EXIF_FORMAT_UNDEFINED;
 260                 }
 261
 262                 /* Some cameras fill the tag with '\0' or ' '. */
 263                 for (i = 0; i < e->size &&
 264                             (!e->data[i] || (e->data[i] == ' ')); i++);
 265                 if (i && (i == e->size)) {
 266                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 267                                 "Tag 'UserComment' contained unnecessary "
 268                                 "data which has been removed.");
 269                         exif_mem_free (e->priv->mem, e->data);
 270                         e->data = NULL;
 271                         e->size = 0;
 272                         e->components = 0;
 273                 }
 274
 275                 /* There need to be at least 8 bytes. */
 276                 if (e->size < 8) {
 277                         e->data = exif_entry_realloc (e, e->data, 8 + e->size);
 278                         if (!e->data) {
 279                                 e->size = 0;
 280                                 e->components = 0;
 281                                 return;
 282                         }
 283
 284                         /* Assume ASCII */
 285                         memmove (e->data + 8, e->data, e->size);
 286                         memcpy (e->data, "ASCII\0\0\0", 8);
 287                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 288                                 "Tag 'UserComment' has been expanded to at "
 289                                 "least 8 bytes in order to follow the "
 290                                 "specification.");
 291                         break;
 292                 }
 293
 294                 /*
 295                  * If the first 8 bytes are empty and real data starts
 296                  * afterwards, let's assume ASCII and claim the 8 first
 297                  * bytes for the format specifyer.
 298                  */
 299                 if (i >= 8) {
 300                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 301                                 "Tag 'UserComment' did not start with "
 302                                 "format identifyer. This has been fixed.");
 303                         memcpy (e->data, "ASCII\0\0\0", 8);
 304                 }
 305
 306                 /* First 8 bytes need to follow the specification. */
 307                 if (memcmp (e->data, "ASCII\0\0\0"  , 8) &&
 308                     memcmp (e->data, "UNICODE\0"    , 8) &&
 309                     memcmp (e->data, "JIS\0\0\0\0\0", 8)) {
 310                         e->data = exif_entry_realloc (e, e->data, 8 + e->size);
 311                         if (!e->data) {
 312                                 e->size = 0;
 313                                 e->components = 0;
 314                                 break;
 315                         }
 316
 317                         /* Assume ASCII */
 318                         memmove (e->data + 8, e->data, e->size);
 319                         memcpy (e->data, "ASCII\0\0\0", 8);
 320                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 321                                 "Tag 'UserComment' did not start with "
 322                                 "format identifyer. This has been fixed.");
 323                         break;
 324                 }
 325
 326                 break;
 327         default:
 328                 break;
 329         }
 330 }
 331
 332 void
 333 exif_entry_dump (ExifEntry *e, unsigned int indent)
 334 {
 335         char buf[1024];
 336         char value[1024];
 337         unsigned int i;
 338
 339         for (i = 0; i < 2 * indent; i++)
 340                 buf[i] = ' ';
 341         buf[i] = '\0';
 342
 343         if (!e)
 344                 return;
 345
 346         printf ("%sTag: 0x%x ('%s')\n", buf, e->tag,
 347                 exif_tag_get_name (e->tag));
 348         printf ("%s  Format: %i ('%s')\n", buf, e->format,
 349                 exif_format_get_name (e->format));
 350         printf ("%s  Components: %i\n", buf, (int) e->components);
 351         printf ("%s  Size: %i\n", buf, e->size);
 352         printf ("%s  Value: %s\n", buf, exif_entry_get_value (e, value, sizeof(value)));
 353 }
 354
 355 #define CF(entry,target,v,maxlen)                                       \
 356 {                                                                       \
 357         if (entry->format != target) {                                  \
 358                 exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA,      \
 359                         _("The tag '%s' contains data of an invalid "   \
 360                         "format ('%s', expected '%s')."),               \
 361                         exif_tag_get_name (entry->tag),                 \
 362                         exif_format_get_name (entry->format),           \
 363                         exif_format_get_name (target));                 \
 364                 break;                                                  \
 365         }                                                               \
 366 }
 367
 368 #define CC(entry,target,v,maxlen)                                       \
 369 {                                                                       \
 370         if (entry->components != target) {                              \
 371                 exif_entry_log (entry, EXIF_LOG_CODE_CORRUPT_DATA,      \
 372                         _("The tag '%s' contains an invalid number of " \
 373                           "components (%i, expected %i)."),             \
 374                         exif_tag_get_name (entry->tag),         \
 375                         (int) entry->components, (int) target);         \
 376                 break;                                                  \
 377         }                                                               \
 378 }
 379
 380 static struct {
 381         ExifTag tag;
 382         const char *strings[10];
 383 } list[] = {
 384   { EXIF_TAG_PLANAR_CONFIGURATION,
 385     { N_("chunky format"), N_("planar format"), NULL}},
 386   { EXIF_TAG_SENSING_METHOD,
 387     { "", N_("Not defined"), N_("One-chip color area sensor"),
 388       N_("Two-chip color area sensor"), N_("Three-chip color area sensor"),
 389       N_("Color sequential area sensor"), "", N_("Trilinear sensor"),
 390       N_("Color sequential linear sensor"), NULL}},
 391   { EXIF_TAG_ORIENTATION,
 392     { "", N_("top - left"), N_("top - right"), N_("bottom - right"),
 393       N_("bottom - left"), N_("left - top"), N_("right - top"),
 394       N_("right - bottom"), N_("left - bottom"), NULL}},
 395   { EXIF_TAG_YCBCR_POSITIONING,
 396     { "", N_("centered"), N_("co-sited"), NULL}},
 397   { EXIF_TAG_PHOTOMETRIC_INTERPRETATION, {"", N_("RGB"), N_("YCbCr"), NULL}},
 398   { EXIF_TAG_CUSTOM_RENDERED,
 399     { N_("Normal process"), N_("Custom process"), NULL}},
 400   { EXIF_TAG_EXPOSURE_MODE,
 401     { N_("Auto exposure"), N_("Manual exposure"), N_("Auto bracket"), NULL}},
 402   { EXIF_TAG_WHITE_BALANCE,
 403     { N_("Auto white balance"), N_("Manual white balance"), NULL}},
 404   { EXIF_TAG_SCENE_CAPTURE_TYPE,
 405     { N_("Standard"), N_("Landscape"), N_("Portrait"),
 406       N_("Night scene"), NULL}},
 407   { EXIF_TAG_GAIN_CONTROL,
 408     { N_("Normal"), N_("Low gain up"), N_("High gain up"),
 409       N_("Low gain down"), N_("High gain down"), NULL}},
 410   { EXIF_TAG_SATURATION,
 411     { N_("Normal"), N_("Low saturation"), N_("High saturation"), NULL}},
 412   { EXIF_TAG_CONTRAST , {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
 413   { EXIF_TAG_SHARPNESS, {N_("Normal"), N_("Soft"), N_("Hard"), NULL}},
 414   { 0, {NULL}}
 415 };
 416
 417 static struct {
 418   ExifTag tag;
 419   struct {
 420     int index;
 421     const char *values[4];
 422   } elem[25];
 423 } list2[] = {
 424   { EXIF_TAG_METERING_MODE,
 425     { {  0, {N_("Unknown"), NULL}},
 426       {  1, {N_("Average"), N_("avg"), NULL}},
 427       {  2, {N_("Center-Weighted Average"), N_("Center-Weight"), NULL}},
 428       {  3, {N_("Spot"), NULL}},
 429       {  4, {N_("Multi Spot"), NULL}},
 430       {  5, {N_("Pattern"), NULL}},
 431       {  6, {N_("Partial"), NULL}},
 432       {255, {N_("Other"), NULL}},
 433       {  0, {NULL}}}},
 434   { EXIF_TAG_COMPRESSION,
 435     { {1, {N_("Uncompressed"), NULL}},
 436       {5, {N_("LZW compression"), NULL}},
 437       {6, {N_("JPEG compression"), NULL}},
 438       {0, {NULL}}}},
 439   { EXIF_TAG_LIGHT_SOURCE,
 440     { {  0, {N_("Unknown"), NULL}},
 441       {  1, {N_("Daylight"), NULL}},
 442       {  2, {N_("Fluorescent"), NULL}},
 443       {  3, {N_("Tungsten incandescent light"), N_("Tungsten"), NULL}},
 444       {  4, {N_("Flash"), NULL}},
 445       {  9, {N_("Fine weather"), NULL}},
 446       { 10, {N_("Cloudy weather"), N_("cloudy"), NULL}},
 447       { 11, {N_("Shade"), NULL}},
 448       { 12, {N_("Daylight fluorescent"), NULL}},
 449       { 13, {N_("Day white fluorescent"), NULL}},
 450       { 14, {N_("Cool white fluorescent"), NULL}},
 451       { 15, {N_("White fluorescent"), NULL}},
 452       { 17, {N_("Standard light A"), NULL}},
 453       { 18, {N_("Standard light B"), NULL}},
 454       { 19, {N_("Standard light C"), NULL}},
 455       { 20, {N_("D55"), NULL}},
 456       { 21, {N_("D65"), NULL}},
 457       { 22, {N_("D75"), NULL}},
 458       { 24, {N_("ISO studio tungsten"),NULL}},
 459       {255, {N_("Other"), NULL}},
 460       {  0, {NULL}}}},
 461   { EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT,
 462     { {2, {N_("Inch"), N_("in"), NULL}},
 463       {3, {N_("Centimeter"), N_("cm"), NULL}},
 464       {0, {NULL}}}},
 465   { EXIF_TAG_RESOLUTION_UNIT,
 466     { {2, {N_("Inch"), N_("in"), NULL}},
 467       {3, {N_("Centimeter"), N_("cm"), NULL}},
 468       {0, {NULL}}}},
 469   { EXIF_TAG_EXPOSURE_PROGRAM,
 470     { {0, {N_("Not defined"), NULL}},
 471       {1, {N_("Manual"), NULL}},
 472       {2, {N_("Normal program"), N_("Normal"), NULL}},
 473       {3, {N_("Aperture priority"), N_("Aperture"), NULL}},
 474       {4, {N_("Shutter priority"),N_("Shutter"), NULL}},
 475       {5, {N_("Creative program (biased toward depth of field)"),
 476            N_("Creative"), NULL}},
 477       {6, {N_("Creative program (biased toward fast shutter speed"),
 478            N_("Action"), NULL}},
 479       {7, {N_("Portrait mode (for closeup photos with the background out "
 480               "of focus)"), N_("Portrait"), NULL}},
 481       {8, {N_("Landscape mode (for landscape photos with the background "
 482               "in focus)"), N_("Landscape"), NULL}},
 483       {0, {NULL}}}},
 484   { EXIF_TAG_FLASH,
 485     { {0x0000, {N_("Flash did not fire."), N_("no flash"), NULL}},
 486       {0x0001, {N_("Flash fired."), N_("flash"), N_("Yes"), NULL}},
 487       {0x0005, {N_("Strobe return light not detected."), N_("W/o strobe"),
 488                 NULL}},
 489       {0x0007, {N_("Strobe return light detected."), N_("W. strobe"), NULL}},
 490       {0x0009, {N_("Flash fired, compulsatory flash mode"), NULL}},
 491       {0x000d, {N_("Flash fired, compulsatory flash mode, return light "
 492                    "not detected."), NULL}},
 493       {0x000f, {N_("Flash fired, compulsatory flash mode, return light "
 494                    "detected."), NULL}},
 495       {0x0010, {N_("Flash did not fire, compulsatory flash mode."), NULL}},
 496       {0x0018, {N_("Flash did not fire, auto mode."), NULL}},
 497       {0x0019, {N_("Flash fired, auto mode."), NULL}},
 498       {0x001d, {N_("Flash fired, auto mode, return light not detected."),
 499                 NULL}},
 500       {0x001f, {N_("Flash fired, auto mode, return light detected."), NULL}},
 501       {0x0020, {N_("No flash function."),NULL}},
 502       {0x0041, {N_("Flash fired, red-eye reduction mode."), NULL}},
 503       {0x0045, {N_("Flash fired, red-eye reduction mode, return light "
 504                    "not detected."), NULL}},
 505       {0x0047, {N_("Flash fired, red-eye reduction mode, return light "
 506                    "detected."), NULL}},
 507       {0x0049, {N_("Flash fired, compulsory flash mode, red-eye reduction "
 508                    "mode."), NULL}},
 509       {0x004d, {N_("Flash fired, compulsory flash mode, red-eye reduction "
 510                   "mode, return light not detected"), NULL}},
 511       {0x004f, {N_("Flash fired, compulsory flash mode, red-eye reduction, "
 512                    "return light detected"), NULL}},
 513       {0x0058, {N_("Flash did not fire, auto mode, red-eye reduction mode"), NULL}},
 514       {0x0059, {N_("Flash fired, auto mode, red-eye reduction mode"), NULL}},
 515       {0x005d, {N_("Flash fired, auto mode, return light not detected, "
 516                    "red-eye reduction mode."), NULL}},
 517       {0x005f, {N_("Flash fired, auto mode, return light detected, "
 518                    "red-eye reduction mode."), NULL}},
 519       {0x0000, {NULL}}}},
 520   {EXIF_TAG_SUBJECT_DISTANCE_RANGE,
 521     { {0, {N_("Unknown"), N_("?"), NULL}},
 522       {1, {N_("Macro"), NULL}},
 523       {2, {N_("Close view"), N_("close"), NULL}},
 524       {3, {N_("Distant view"), N_("distant"), NULL}},
 525       {0, {NULL}}}},
 526   { EXIF_TAG_COLOR_SPACE,
 527     { {1, {N_("sRGB"), NULL}},
 528       {0xffff, {N_("Uncalibrated"), NULL}}}},
 529   {0, }
 530 };
 531
 532 const char *
 533 exif_entry_get_value (ExifEntry *e, char *val, unsigned int maxlen)
 534 {
 535         unsigned int i, j, k, l;
 536         ExifByte v_byte;
 537         ExifShort v_short, v_short2, v_short3, v_short4;
 538         ExifLong v_long;
 539         ExifSLong v_slong;
 540         ExifRational v_rat;
 541         ExifSRational v_srat;
 542         char b[64];
 543         const char *c;
 544         ExifByteOrder o;
 545         double d;
 546         ExifEntry *entry;
 547         static struct {
 548                 char *label;
 549                 char major, minor;
 550         } versions[] = {
 551                 {"0110", 1,  1},
 552                 {"0120", 1,  2},
 553                 {"0200", 2,  0},
 554                 {"0210", 2,  1},
 555                 {"0220", 2,  2},
 556                 {"0221", 2, 21},
 557                 {NULL  , 0,  0}
 558         };
 559
 560         bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
 561         bindtextdomain (GETTEXT_PACKAGE, LIBEXIF_LOCALEDIR);
 562
 563         /* We need the byte order */
 564         if (!e || !e->parent || !e->parent->parent)
 565                 return NULL;
 566         o = exif_data_get_byte_order (e->parent->parent);
 567
 568         memset (val, 0, maxlen);
 569         memset (b, 0, sizeof (b));
 570         maxlen--;
 571
 572         /* Sanity check */
 573         if (e->size != e->components * exif_format_get_size (e->format)) {
 574                 snprintf (val, maxlen, _("Invalid size of entry (%i, "
 575                         "expected %li x %i)."), e->size, e->components,
 576                                 exif_format_get_size (e->format));
 577                 return val;
 578         }
 579
 580         switch (e->tag) {
 581         case EXIF_TAG_USER_COMMENT:
 582
 583                 /*
 584                  * The specification says UNDEFINED, but some
 585                  * manufacturers don't care and use ASCII. If this is the
 586                  * case here, only refuse to read it if there is no chance
 587                  * of finding readable data.
 588                  */
 589                 if ((e->format != EXIF_FORMAT_ASCII) ||
 590                     (e->size <= 8) ||
 591                     ( memcmp (e->data, "ASCII\0\0\0"  , 8) &&
 592                       memcmp (e->data, "UNICODE\0"    , 8) &&
 593                       memcmp (e->data, "JIS\0\0\0\0\0", 8) &&
 594                       memcmp (e->data, "\0\0\0\0\0\0\0\0", 8)))
 595                         CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 596
 597                 /*
 598                  * Note that, according to the specification (V2.1, p 40),
 599                  * the user comment field does not have to be
 600                  * NULL terminated.
 601                  */
 602                 if ((e->size >= 8) && !memcmp (e->data, "ASCII\0\0\0", 8)) {
 603                         strncpy (val, e->data + 8, MIN (e->size - 8, maxlen));
 604                         break;
 605                 }
 606                 if ((e->size >= 8) && !memcmp (e->data, "UNICODE\0", 8)) {
 607                         strncpy (val, _("Unsupported UNICODE string"), maxlen);
 608                         break;
 609                 }
 610                 if ((e->size >= 8) && !memcmp (e->data, "JIS\0\0\0\0\0", 8)) {
 611                         strncpy (val, _("Unsupported JIS string"), maxlen);
 612                         break;
 613                 }
 614
 615                 /* Check if there is really some information in the tag. */
 616                 for (i = 0; (i < e->size) &&
 617                             (!e->data[i] || (e->data[i] == ' ')); i++);
 618                 if (i == e->size) break;
 619
 620                 /*
 621                  * If we reach this point, the tag does not
 622                  * comply with the standard and seems to contain data.
 623                  * Print as much as possible.
 624                  */
 625                 exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 626                         "Tag UserComment does not comply "
 627                         "with standard but contains data.");
 628                 for (; (i < e->size)  && (strlen (val) < maxlen - 1); i++) {
 629                         exif_entry_log (e, EXIF_LOG_CODE_DEBUG,
 630                                 "Byte at position %i: 0x%02x", i, e->data[i]);
 631                         val[strlen (val)] =
 632                                 isprint (e->data[i]) ? e->data[i] : '.';
 633                 }
 634                 break;
 635
 636         case EXIF_TAG_EXIF_VERSION:
 637                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 638                 CC (e, 4, val, maxlen);
 639                 strncpy (val, _("Unknown Exif Version"), maxlen);
 640                 for (i = 0; versions[i].label; i++) {
 641                         if (!memcmp (e->data, versions[i].label, 4)) {
 642                                 snprintf (val, maxlen,
 643                                         _("Exif Version %d.%d"),
 644                                         versions[i].major,
 645                                         versions[i].minor);
 646                                 break;
 647                         }
 648                 }
 649                 break;
 650         case EXIF_TAG_FLASH_PIX_VERSION:
 651                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 652                 CC (e, 4, val, maxlen);
 653                 if (!memcmp (e->data, "0100", 4))
 654                         strncpy (val, _("FlashPix Version 1.0"), maxlen);
 655                 else if (!memcmp (e->data, "0101", 4))
 656                         strncpy (val, _("FlashPix Version 1.01"), maxlen);
 657                 else
 658                         strncpy (val, _("Unknown FlashPix Version"), maxlen);
 659                 break;
 660         case EXIF_TAG_COPYRIGHT:
 661                 CF (e, EXIF_FORMAT_ASCII, val, maxlen);
 662
 663                 /*
 664                  * First part: Photographer.
 665                  * Some cameras store a string like "   " here. Ignore it.
 666                  */
 667                 if (e->size && e->data &&
 668                     (strspn (e->data, " ") != strlen ((char *) e->data)))
 669                         strncpy (val, e->data, MIN (maxlen, e->size));
 670                 else
 671                         strncpy (val, _("[None]"), maxlen);
 672                 strncat (val, " ", maxlen - strlen (val));
 673                 strncat (val, _("(Photographer)"), maxlen - strlen (val));
 674
 675                 /* Second part: Editor. */
 676                 strncat (val, " - ", maxlen - strlen (val));
 677                 if (e->size && e->data &&
 678                     (strlen ((char *) e->data) + 1 < e->size) &&
 679                     (strspn (e->data, " ") != strlen ((char *) e->data)))
 680                         strncat (val, e->data + strlen (e->data) + 1,
 681                                  MIN (maxlen - strlen (val),
 682                                       e->size - (strlen (e->data) + 1)));
 683                 else
 684                         strncat (val, _("[None]"), maxlen - strlen (val));
 685                 strncat (val, " ", maxlen - strlen (val));
 686                 strncat (val, _("(Editor)"), maxlen - strlen (val));
 687
 688                 break;
 689         case EXIF_TAG_FNUMBER:
 690                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 691                 CC (e, 1, val, maxlen);
 692                 v_rat = exif_get_rational (e->data, o);
 693                 if (!v_rat.denominator) return NULL;
 694                 snprintf (val, maxlen, "f/%.01f", (float) v_rat.numerator /
 695                                                     (float) v_rat.denominator);
 696                 break;
 697         case EXIF_TAG_APERTURE_VALUE:
 698                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 699                 CC (e, 1, val, maxlen);
 700                 v_rat = exif_get_rational (e->data, o);
 701                 if (!v_rat.denominator) return NULL;
 702                 snprintf (val, maxlen, "f/%.01f",
 703                           pow (2 , ((float) v_rat.numerator /
 704                                     (float) v_rat.denominator) / 2.));
 705                 break;
 706         case EXIF_TAG_FOCAL_LENGTH:
 707                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 708                 CC (e, 1, val, maxlen);
 709                 v_rat = exif_get_rational (e->data, o);
 710                 if (!v_rat.denominator) return NULL;
 711
 712                 /*
 713                  * For calculation of the 35mm equivalent,
 714                  * Minolta cameras need a multiplier that depends on the
 715                  * camera model.
 716                  */
 717                 d = 0.;
 718                 entry = exif_content_get_entry (
 719                         e->parent->parent->ifd[EXIF_IFD_0], EXIF_TAG_MAKE);
 720                 if (entry && entry->data &&
 721                     !strncmp (entry->data, "Minolta", 7)) {
 722                         entry = exif_content_get_entry (
 723                                         e->parent->parent->ifd[EXIF_IFD_0],
 724                                         EXIF_TAG_MODEL);
 725                         if (entry && entry->data) {
 726                                 if (!strncmp (entry->data, "DiMAGE 7", 8))
 727                                         d = 3.9;
 728                                 else if (!strncmp (entry->data, "DiMAGE 5", 8))
 729                                         d = 4.9;
 730                         }
 731                 }
 732                 if (d)
 733                         snprintf (b, sizeof (b), _(" (35 equivalent: %d mm)"),
 734                                   (int) (d * (double) v_rat.numerator /
 735                                              (double) v_rat.denominator));
 736
 737                 snprintf (val, maxlen, "%.1f mm",
 738                         (float) v_rat.numerator / (float) v_rat.denominator);
 739                 if (maxlen > strlen (val) + strlen (b))
 740                         strncat (val, b, maxlen - strlen (val) - 1);
 741                 break;
 742         case EXIF_TAG_SUBJECT_DISTANCE:
 743                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 744                 CC (e, 1, val, maxlen);
 745                 v_rat = exif_get_rational (e->data, o);
 746                 if (!v_rat.denominator) return NULL;
 747                 snprintf (val, maxlen, "%.1f m", (float) v_rat.numerator /
 748                                                    (float) v_rat.denominator);
 749                 break;
 750         case EXIF_TAG_EXPOSURE_TIME:
 751                 CF (e, EXIF_FORMAT_RATIONAL, val, maxlen);
 752                 CC (e, 1, val, maxlen);
 753                 v_rat = exif_get_rational (e->data, o);
 754                 if (!v_rat.denominator) return NULL;
 755                 d = (double) v_rat.numerator / (double) v_rat.denominator;
 756                 if (d < 1)
 757                         snprintf (val, maxlen, _("1/%d"),
 758                                   (int) (1. / d));
 759                 else
 760                         snprintf (val, maxlen, _("%d"), (int) d);
 761                 if (maxlen > strlen (val) + strlen (" sec."))
 762                         strncat (val, " sec.", maxlen - strlen (val) - 1);
 763                 break;
 764         case EXIF_TAG_SHUTTER_SPEED_VALUE:
 765                 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
 766                 CC (e, 1, val, maxlen);
 767                 v_srat = exif_get_srational (e->data, o);
 768                 if (!v_srat.denominator) return NULL;
 769                 snprintf (val, maxlen, "%.0f/%.0f", (float) v_srat.numerator,
 770                           (float) v_srat.denominator);
 771                 if (maxlen > strlen (val) + strlen (" sec."))
 772                         strncat (val, " sec.", maxlen - strlen (val) - 1);
 773                 snprintf (b, sizeof (b), " (APEX: %i)",
 774                         (int) pow (sqrt(2), (float) v_srat.numerator /
 775                                             (float) v_srat.denominator));
 776                 if (maxlen > strlen (val) + strlen (b))
 777                         strncat (val, b, maxlen - strlen (val) - 1);
 778                 break;
 779         case EXIF_TAG_BRIGHTNESS_VALUE:
 780                 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
 781                 CC (e, 1, val, maxlen);
 782                 v_srat = exif_get_srational (e->data, o);
 783                 snprintf (val, maxlen, "%i/%i", (int) v_srat.numerator,
 784                                                   (int) v_srat.denominator);
 785                 /* FIXME: How do I calculate the APEX value? */
 786                 break;
 787         case EXIF_TAG_FILE_SOURCE:
 788                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 789                 CC (e, 1, val, maxlen);
 790                 switch (e->data[0]) {
 791                 case 0x03: strncpy (val, _("DSC"), maxlen); break;
 792                 default: snprintf (val, maxlen, "0x%02x", e->data[0]); break;
 793                 }
 794                 break;
 795         case EXIF_TAG_COMPONENTS_CONFIGURATION:
 796                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 797                 CC (e, 4, val, maxlen);
 798                 for (i = 0; i < 4; i++) {
 799                         switch (e->data[i]) {
 800                         case 0: c = _("-"); break;
 801                         case 1: c = _("Y"); break;
 802                         case 2: c = _("Cb"); break;
 803                         case 3: c = _("Cr"); break;
 804                         case 4: c = _("R"); break;
 805                         case 5: c = _("G"); break;
 806                         case 6: c = _("B"); break;
 807                         default: c = _("reserved"); break;
 808                         }
 809                         strncat (val, c, maxlen - strlen (val));
 810                         if (i < 3) strncat (val, " ", maxlen - strlen (val));
 811                 }
 812                 break;
 813         case EXIF_TAG_EXPOSURE_BIAS_VALUE:
 814                 CF (e, EXIF_FORMAT_SRATIONAL, val, maxlen);
 815                 CC (e, 1, val, maxlen);
 816                 v_srat = exif_get_srational (e->data, o);
 817                 if (!v_srat.denominator)
 818                         return NULL;
 819                 snprintf (val, maxlen, "%s%.01f",
 820                           v_srat.denominator * v_srat.numerator > 0 ? "+" : "",
 821                           (double) v_srat.numerator /
 822                           (double) v_srat.denominator);
 823                 break;
 824         case EXIF_TAG_YCBCR_SUB_SAMPLING:
 825                 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
 826                 CC (e, 2, val, maxlen);
 827                 v_short  = exif_get_short (e->data, o);
 828                 v_short2 = exif_get_short (
 829                         e->data + exif_format_get_size (e->format),
 830                         o);
 831                 if ((v_short == 2) && (v_short2 == 1))
 832                         strncpy (val, _("YCbCr4:2:2"), maxlen);
 833                 else if ((v_short == 2) && (v_short2 == 2))
 834                         strncpy (val, _("YCbCr4:2:0"), maxlen);
 835                 else
 836                         snprintf (val, maxlen, "%i, %i", v_short, v_short2);
 837                 break;
 838         case EXIF_TAG_MAKER_NOTE:
 839                 CF (e, EXIF_FORMAT_UNDEFINED, val, maxlen);
 840                 snprintf (val, maxlen, _("%i bytes unknown data"),
 841                           (int) e->components);
 842                 break;
 843         case EXIF_TAG_SUBJECT_AREA:
 844                 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
 845                 switch (e->components) {
 846                 case 2:
 847                         v_short  = exif_get_short (e->data, o);
 848                         v_short2 = exif_get_short (e->data + 2, o);
 849                         snprintf (val, maxlen, "(x,y) = (%i,%i)",
 850                                   v_short, v_short2);
 851                         break;
 852                 case 3:
 853                         v_short  = exif_get_short (e->data, o);
 854                         v_short2 = exif_get_short (e->data + 2, o);
 855                         v_short3 = exif_get_short (e->data + 4, o);
 856                         snprintf (val, maxlen, _("Within distance %i of "
 857                                 "(x,y) = (%i,%i)"), v_short3, v_short,
 858                                 v_short2);
 859                         break;
 860                 case 4:
 861                         v_short  = exif_get_short (e->data, o);
 862                         v_short2 = exif_get_short (e->data + 2, o);
 863                         v_short3 = exif_get_short (e->data + 4, o);
 864                         v_short4 = exif_get_short (e->data + 6, o);
 865                         snprintf (val, maxlen, _("Within rectangle "
 866                                 "(width %i, height %i) around "
 867                                 "(x,y) = (%i,%i)"), v_short3, v_short4,
 868                                 v_short, v_short2);
 869                         break;
 870                 default:
 871                         snprintf (val, maxlen, _("Unexpected number "
 872                                 "of components (%li, expected 2, 3, or 4)."),
 873                                 e->components);
 874                 }
 875                 break;
 876
 877         case EXIF_TAG_METERING_MODE:
 878         case EXIF_TAG_COMPRESSION:
 879         case EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT:
 880         case EXIF_TAG_RESOLUTION_UNIT:
 881         case EXIF_TAG_EXPOSURE_PROGRAM:
 882         case EXIF_TAG_FLASH:
 883         case EXIF_TAG_SUBJECT_DISTANCE_RANGE:
 884         case EXIF_TAG_COLOR_SPACE:
 885                 CF (e,EXIF_FORMAT_SHORT, val, maxlen);
 886                 CC (e, 1, val, maxlen);
 887                 v_short = exif_get_short (e->data, o);
 888
 889                 /* Search the tag */
 890                 for (i = 0; list2[i].tag && (list2[i].tag != e->tag); i++);
 891                 if (!list2[i].tag) {
 892                         strncpy (val, "Internal error.", maxlen - 1);
 893                         break;
 894                 }
 895
 896                 /* Find the value */
 897                 for (j = 0; list2[i].elem[j].values &&
 898                             (list2[i].elem[j].index < v_short); j++);
 899                 if (list2[i].elem[j].index != v_short) {
 900                         snprintf (val, maxlen, "Internal error (unknown "
 901                                   "value %i).", v_short);
 902                         break;
 903                 }
 904
 905                 /* Find a short enough value */
 906                 memset (val, 0, maxlen);
 907                 for (k = 0; list2[i].elem[j].values &&
 908                             list2[i].elem[j].values[k]; k++) {
 909                   l = strlen (_(list2[i].elem[j].values[k]));
 910                   if ((maxlen > l) && (strlen (val) < l))
 911                     strncpy (val, _(list2[i].elem[j].values[k]), maxlen - 1);
 912                 }
 913                 if (!strlen (val)) snprintf (val, maxlen, "%i", v_short);
 914
 915                 break;
 916         case EXIF_TAG_PLANAR_CONFIGURATION:
 917         case EXIF_TAG_SENSING_METHOD:
 918         case EXIF_TAG_ORIENTATION:
 919         case EXIF_TAG_YCBCR_POSITIONING:
 920         case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
 921         case EXIF_TAG_CUSTOM_RENDERED:
 922         case EXIF_TAG_EXPOSURE_MODE:
 923         case EXIF_TAG_WHITE_BALANCE:
 924         case EXIF_TAG_SCENE_CAPTURE_TYPE:
 925         case EXIF_TAG_GAIN_CONTROL:
 926         case EXIF_TAG_SATURATION:
 927         case EXIF_TAG_CONTRAST:
 928         case EXIF_TAG_SHARPNESS:
 929                 CF (e, EXIF_FORMAT_SHORT, val, maxlen);
 930                 CC (e, 1, val, maxlen);
 931                 v_short = exif_get_short (e->data, o);
 932
 933                 /* Search the tag */
 934                 for (i = 0; list[i].tag && (list[i].tag != e->tag); i++);
 935                 if (!list[i].tag) {
 936                         strncpy (val, "Internal error.", maxlen - 1);
 937                         break;
 938                 }
 939
 940                 /* Find the value */
 941                 for (j = 0; list[i].strings[j] && (j < v_short); j++);
 942                 if (!list[i].strings[j])
 943                         snprintf (val, maxlen, "%i", v_short);
 944                 else
 945                         strncpy (val, _(list[i].strings[j]), maxlen - 1);
 946                 break;
 947         default:
 948                 if (!e->components) break;
 949                 switch (e->format) {
 950                 case EXIF_FORMAT_UNDEFINED:
 951                         break;
 952                 case EXIF_FORMAT_BYTE:
 953                 case EXIF_FORMAT_SBYTE:
 954                         v_byte = e->data[0];
 955                         snprintf (val, maxlen, "0x%02x", v_byte);
 956                         maxlen -= strlen (val);
 957                         for (i = 1; i < e->components; i++) {
 958                                 v_byte = e->data[i];
 959                                 snprintf (b, sizeof (b), ", 0x%02x", v_byte);
 960                                 strncat (val, b, maxlen);
 961                                 maxlen -= strlen (b);
 962                                 if ((signed)maxlen <= 0) break;
 963                         }
 964                         break;
 965                 case EXIF_FORMAT_SHORT:
 966                 case EXIF_FORMAT_SSHORT:
 967                         v_short = exif_get_short (e->data, o);
 968                         snprintf (val, maxlen, "%i", v_short);
 969                         maxlen -= strlen (val);
 970                         for (i = 1; i < e->components; i++) {
 971                                 v_short = exif_get_short (e->data +
 972                                         exif_format_get_size (e->format) *
 973                                         i, o);
 974                                 snprintf (b, sizeof (b), ", %i", v_short);
 975                                 strncat (val, b, maxlen);
 976                                 maxlen -= strlen (b);
 977                                 if ((signed)maxlen <= 0) break;
 978                         }
 979                         break;
 980                 case EXIF_FORMAT_LONG:
 981                         v_long = exif_get_long (e->data, o);
 982                         snprintf (val, maxlen, "%i", (int) v_long);
 983                         maxlen -= strlen (val);
 984                         for (i = 1; i < e->components; i++) {
 985                                 v_long = exif_get_long (e->data +
 986                                         exif_format_get_size (e->format) *
 987                                         i, o);
 988                                 snprintf (b, sizeof (b), ", %li",
 989                                         (long int) v_long);
 990                                 strncat (val, b, maxlen);
 991                                 maxlen -= strlen (b);
 992                                 if ((signed)maxlen <= 0) break;
 993                         }
 994                         break;
 995                 case EXIF_FORMAT_SLONG:
 996                         v_slong = exif_get_slong (e->data, o);
 997                         snprintf (val, maxlen, "%li", (long int) v_slong);
 998                         maxlen -= strlen (val);
 999                         for (i = 1; i < e->components; i++) {
1000                                 v_long = exif_get_slong (e->data +
1001                                         exif_format_get_size (e->format) *
1002                                         i, o);
1003                                 snprintf (b, sizeof (b), ", %li",
1004                                                 (long int) v_long);
1005                                 strncat (val, b, maxlen);
1006                                 maxlen -= strlen (b);
1007                                 if ((signed)maxlen <= 0) break;
1008                         }
1009                         break;
1010                 case EXIF_FORMAT_ASCII:
1011                         strncpy (val, e->data, MIN (maxlen, e->size));
1012                         break;
1013                 case EXIF_FORMAT_RATIONAL:
1014                         v_rat = exif_get_rational (e->data, o);
1015                         if (v_rat.denominator) {
1016                                 snprintf (val, maxlen, "%2.2f", (double)v_rat.numerator / v_rat.denominator);
1017                         } else {
1018                                 snprintf (val, maxlen, "%i/%i", v_rat.numerator,  v_rat.denominator);
1019                         }
1020                         maxlen -= strlen (val);
1021                         for (i = 1; i < e->components; i++) {
1022                                 v_rat = exif_get_rational (
1023                                         e->data + 8 * i, o);
1024                                 snprintf (b, sizeof (b), ", %2.2f",
1025                                            (double)v_rat.numerator / v_rat.denominator);
1026                                 strncat (val, b, maxlen);
1027                                 maxlen -= strlen (b);
1028                                 if ((signed)maxlen <= 0) break;
1029                         }
1030                         break;
1031                 case EXIF_FORMAT_SRATIONAL:
1032                         v_srat = exif_get_srational (e->data, o);
1033                         if (v_srat.denominator) {
1034                                 snprintf (val, maxlen, "%2.2f", (double)v_srat.numerator / v_srat.denominator);
1035                         } else {
1036                                 snprintf (val, maxlen, "%i/%i", v_srat.numerator,  v_srat.denominator);
1037                         }
1038                         maxlen -= strlen (val);
1039                         for (i = 1; i < e->components; i++) {
1040                                 v_srat = exif_get_srational (
1041                                         e->data + 8 * i, o);
1042                                 snprintf (b, sizeof (b), ", %2.2f",
1043                                           (double)v_srat.numerator / v_srat.denominator);
1044                                 strncat (val, b, maxlen);
1045                                 maxlen -= strlen (b);
1046                                 if ((signed) maxlen <= 0) break;
1047                         }
1048                         break;
1049                 case EXIF_FORMAT_DOUBLE:
1050                 case EXIF_FORMAT_FLOAT:
1051                 default:
1052                         /* What to do here? */
1053                         break;
1054                 }
1055         }
1056
1057         return val;
1058 }
1059
1060 void
1061 exif_entry_initialize (ExifEntry *e, ExifTag tag)
1062 {
1063         time_t t;
1064         struct tm *tm;
1065         ExifRational r;
1066         ExifByteOrder o;
1067
1068         /* We need the byte order */
1069         if (!e || !e->parent || e->data || !e->parent->parent)
1070                 return;
1071         o = exif_data_get_byte_order (e->parent->parent);
1072
1073         e->tag = tag;
1074         switch (tag) {
1075
1076         /* LONG, 1 component, no default */
1077         case EXIF_TAG_PIXEL_X_DIMENSION:
1078         case EXIF_TAG_PIXEL_Y_DIMENSION:
1079         case EXIF_TAG_EXIF_IFD_POINTER:
1080         case EXIF_TAG_GPS_INFO_IFD_POINTER:
1081         case EXIF_TAG_INTEROPERABILITY_IFD_POINTER:
1082         case EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH:
1083         case EXIF_TAG_JPEG_INTERCHANGE_FORMAT:
1084                 e->components = 1;
1085                 e->format = EXIF_FORMAT_LONG;
1086                 e->size = exif_format_get_size (e->format) * e->components;
1087                 e->data = exif_entry_alloc (e, e->size);
1088                 break;
1089
1090         /* SHORT, 1 component, no default */
1091         case EXIF_TAG_SUBJECT_LOCATION:
1092         case EXIF_TAG_SENSING_METHOD:
1093         case EXIF_TAG_PHOTOMETRIC_INTERPRETATION:
1094         case EXIF_TAG_COMPRESSION:
1095         case EXIF_TAG_EXPOSURE_MODE:
1096         case EXIF_TAG_WHITE_BALANCE:
1097         case EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM:
1098         case EXIF_TAG_GAIN_CONTROL:
1099         case EXIF_TAG_SUBJECT_DISTANCE_RANGE:
1100
1101         /* SHORT, 1 component, default 0 */
1102         case EXIF_TAG_IMAGE_WIDTH:
1103         case EXIF_TAG_IMAGE_LENGTH:
1104         case EXIF_TAG_EXPOSURE_PROGRAM:
1105         case EXIF_TAG_LIGHT_SOURCE:
1106         case EXIF_TAG_METERING_MODE:
1107         case EXIF_TAG_CUSTOM_RENDERED:
1108         case EXIF_TAG_SCENE_CAPTURE_TYPE:
1109         case EXIF_TAG_CONTRAST:
1110         case EXIF_TAG_SATURATION:
1111         case EXIF_TAG_SHARPNESS:
1112                 e->components = 1;
1113                 e->format = EXIF_FORMAT_SHORT;
1114                 e->size = exif_format_get_size (e->format) * e->components;
1115                 e->data = exif_entry_alloc (e, e->size);
1116                 exif_set_short (e->data, o, 0);
1117                 break;
1118
1119         /* SHORT, 1 component, default 1 */
1120     case EXIF_TAG_ORIENTATION:
1121     case EXIF_TAG_PLANAR_CONFIGURATION:
1122     case EXIF_TAG_YCBCR_POSITIONING:
1123                 e->components = 1;
1124                 e->format = EXIF_FORMAT_SHORT;
1125                 e->size = exif_format_get_size (e->format) * e->components;
1126                 e->data = exif_entry_alloc (e, e->size);
1127                 exif_set_short (e->data, o, 1);
1128                 break;
1129
1130         /* SHORT, 1 component, default 2 */
1131     case EXIF_TAG_RESOLUTION_UNIT:
1132         case EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT:
1133                 e->components = 1;
1134                 e->format = EXIF_FORMAT_SHORT;
1135                 e->size = exif_format_get_size (e->format) * e->components;
1136                 e->data = exif_entry_alloc (e, e->size);
1137                 exif_set_short (e->data, o, 2);
1138                 break;
1139
1140         /* SHORT, 1 component, default 3 */
1141     case EXIF_TAG_SAMPLES_PER_PIXEL:
1142                 e->components = 1;
1143                 e->format = EXIF_FORMAT_SHORT;
1144                 e->size = exif_format_get_size (e->format) * e->components;
1145                 e->data = exif_entry_alloc (e, e->size);
1146                 exif_set_short (e->data, o, 3);
1147                 break;
1148
1149         case EXIF_TAG_BITS_PER_SAMPLE:
1150                 e->components = 3;
1151                 e->format = EXIF_FORMAT_SHORT;
1152                 e->size = exif_format_get_size (e->format) * e->components;
1153                 e->data = exif_entry_alloc (e, e->size);
1154                 if (!e->data) break;
1155                 exif_set_short (e->data, o, 8);
1156                 exif_set_short (
1157                         e->data + exif_format_get_size (e->format),
1158                         o, 8);
1159                 exif_set_short (
1160                         e->data + 2 * exif_format_get_size (e->format),
1161                         o, 8);
1162                 break;
1163         case EXIF_TAG_YCBCR_SUB_SAMPLING:
1164                 e->components = 2;
1165                 e->format = EXIF_FORMAT_SHORT;
1166                 e->size = exif_format_get_size (e->format) * e->components;
1167                 e->data = exif_entry_alloc (e, e->size);
1168                 if (!e->data) break;
1169                 exif_set_short (e->data, o, 2);
1170                 exif_set_short (
1171                         e->data + exif_format_get_size (e->format),
1172                         o, 1);
1173                 break;
1174
1175         /* SRATIONAL, 1 component, no default */
1176         case EXIF_TAG_EXPOSURE_BIAS_VALUE:
1177         case EXIF_TAG_BRIGHTNESS_VALUE:
1178         case EXIF_TAG_SHUTTER_SPEED_VALUE:
1179                 e->components = 1;
1180                 e->format = EXIF_FORMAT_SRATIONAL;
1181                 e->size = exif_format_get_size (e->format) * e->components;
1182                 e->data = exif_entry_alloc (e, e->size);
1183                 break;
1184
1185         /* RATIONAL, 1 component, no default */
1186         case EXIF_TAG_EXPOSURE_TIME:
1187         case EXIF_TAG_FOCAL_PLANE_X_RESOLUTION:
1188         case EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION:
1189         case EXIF_TAG_EXPOSURE_INDEX:
1190         case EXIF_TAG_FLASH_ENERGY:
1191         case EXIF_TAG_FNUMBER:
1192         case EXIF_TAG_FOCAL_LENGTH:
1193         case EXIF_TAG_SUBJECT_DISTANCE:
1194         case EXIF_TAG_MAX_APERTURE_VALUE:
1195         case EXIF_TAG_APERTURE_VALUE:
1196         case EXIF_TAG_COMPRESSED_BITS_PER_PIXEL:
1197         case EXIF_TAG_PRIMARY_CHROMATICITIES:
1198         case EXIF_TAG_DIGITAL_ZOOM_RATIO:
1199                 e->components = 1;
1200                 e->format = EXIF_FORMAT_RATIONAL;
1201                 e->size = exif_format_get_size (e->format) * e->components;
1202                 e->data = exif_entry_alloc (e, e->size);
1203                 break;
1204
1205         /* RATIONAL, 1 component, default 72/1 */
1206         case EXIF_TAG_X_RESOLUTION:
1207         case EXIF_TAG_Y_RESOLUTION:
1208                 e->components = 1;
1209                 e->format = EXIF_FORMAT_RATIONAL;
1210                 e->size = exif_format_get_size (e->format) * e->components;
1211                 e->data = exif_entry_alloc (e, e->size);
1212                 r.numerator = 72;
1213                 r.denominator = 1;
1214                 exif_set_rational (e->data, o, r);
1215                 break;
1216
1217         /* RATIONAL, 2 components, no default */
1218         case EXIF_TAG_WHITE_POINT:
1219                 e->components = 2;
1220                 e->format = EXIF_FORMAT_RATIONAL;
1221                 e->size = exif_format_get_size (e->format) * e->components;
1222                 e->data = exif_entry_alloc (e, e->size);
1223                 break;
1224
1225         /* RATIONAL, 6 components */
1226         case EXIF_TAG_REFERENCE_BLACK_WHITE:
1227                 e->components = 6;
1228                 e->format = EXIF_FORMAT_RATIONAL;
1229                 e->size = exif_format_get_size (e->format) * e->components;
1230                 e->data = exif_entry_alloc (e, e->size);
1231                 if (!e->data) break;
1232                 r.denominator = 1;
1233                 r.numerator = 0;
1234                 exif_set_rational (e->data, o, r);
1235                 r.numerator = 255;
1236                 exif_set_rational (
1237                         e->data + exif_format_get_size (e->format), o, r);
1238                 r.numerator = 0;
1239                 exif_set_rational (
1240                         e->data + 2 * exif_format_get_size (e->format), o, r);
1241                 r.numerator = 255;
1242                 exif_set_rational (
1243                         e->data + 3 * exif_format_get_size (e->format), o, r);
1244                 r.numerator = 0;
1245                 exif_set_rational (
1246                         e->data + 4 * exif_format_get_size (e->format), o, r);
1247                 r.numerator = 255;
1248                 exif_set_rational (
1249                         e->data + 5 * exif_format_get_size (e->format), o, r);
1250                 break;
1251
1252         /* ASCII, 20 components */
1253         case EXIF_TAG_DATE_TIME:
1254         case EXIF_TAG_DATE_TIME_ORIGINAL:
1255         case EXIF_TAG_DATE_TIME_DIGITIZED:
1256                 t = time (NULL);
1257                 tm = localtime (&t);
1258                 e->components = 20;
1259                 e->format = EXIF_FORMAT_ASCII;
1260                 e->size = exif_format_get_size (e->format) * e->components;
1261                 e->data = exif_entry_alloc (e, e->size);
1262                 if (!e->data) break;
1263                 snprintf ((char *) e->data, e->size,
1264                           "%04i:%02i:%02i %02i:%02i:%02i",
1265                           tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1266                           tm->tm_hour, tm->tm_min, tm->tm_sec);
1267                 break;
1268
1269         /* ASCII, no default */
1270         case EXIF_TAG_SUB_SEC_TIME:
1271         case EXIF_TAG_SUB_SEC_TIME_ORIGINAL:
1272         case EXIF_TAG_SUB_SEC_TIME_DIGITIZED:
1273                 e->components = 0;
1274                 e->format = EXIF_FORMAT_ASCII;
1275                 e->size = 0;
1276                 e->data = NULL;
1277                 break;
1278         case EXIF_TAG_IMAGE_DESCRIPTION:
1279         case EXIF_TAG_MAKE:
1280         case EXIF_TAG_MODEL:
1281         case EXIF_TAG_SOFTWARE:
1282         case EXIF_TAG_ARTIST:
1283                 e->components = strlen ("[None]") + 1;
1284                 e->format = EXIF_FORMAT_ASCII;
1285                 e->size = exif_format_get_size (e->format) * e->components;
1286                 e->data = exif_entry_alloc (e, e->size);
1287                 if (!e->data) break;
1288                 strncpy (e->data, "[None]", e->size);
1289                 break;
1290         case EXIF_TAG_COPYRIGHT:
1291                 e->components = (strlen ("[None]") + 1) * 2;
1292                 e->format = EXIF_FORMAT_ASCII;
1293                 e->size = exif_format_get_size (e->format) * e->components;
1294                 e->data = exif_entry_alloc (e, e->size);
1295                 if (!e->data) break;
1296                 strcpy (e->data +                     0, "[None]");
1297                 strcpy (e->data + strlen ("[None]") + 1, "[None]");
1298                 break;
1299
1300         /* UNDEFINED, no components, no default */
1301         case EXIF_TAG_MAKER_NOTE:
1302         case EXIF_TAG_USER_COMMENT:
1303                 e->components = 0;
1304                 e->format = EXIF_FORMAT_UNDEFINED;
1305                 e->size = 0;
1306                 e->data = NULL;
1307                 break;
1308
1309         /* UNDEFINED, 1 component, default 1 */
1310         case EXIF_TAG_SCENE_TYPE:
1311                 e->components = 1;
1312                 e->format = EXIF_FORMAT_UNDEFINED;
1313                 e->size = exif_format_get_size (e->format) * e->components;
1314                 e->data = exif_entry_alloc (e, e->size);
1315                 if (!e->data) break;
1316                 e->data[0] = 0x01;
1317                 break;
1318
1319         /* UNDEFINED, 1 component, default 3 */
1320         case EXIF_TAG_FILE_SOURCE:
1321                 e->components = 1;
1322                 e->format = EXIF_FORMAT_UNDEFINED;
1323                 e->size = exif_format_get_size (e->format) * e->components;
1324                 e->data = exif_entry_alloc (e, e->size);
1325                 if (!e->data) break;
1326                 e->data[0] = 0x03;
1327                 break;
1328
1329         /* UNDEFINED, 4 components, default 0 1 0 0 */
1330         case EXIF_TAG_FLASH_PIX_VERSION:
1331                 e->components = 4;
1332                 e->format = EXIF_FORMAT_UNDEFINED;
1333                 e->size = exif_format_get_size (e->format) * e->components;
1334                 e->data = exif_entry_alloc (e, e->size);
1335                 if (!e->data) break;
1336                 memcpy (e->data, "0100", 4);
1337                 break;
1338
1339         /* UNDEFINED, 4 components, default 0 2 1 0 */
1340         case EXIF_TAG_EXIF_VERSION:
1341                 e->components = 4;
1342                 e->format = EXIF_FORMAT_UNDEFINED;
1343                 e->size = exif_format_get_size (e->format) * e->components;
1344                 e->data = exif_entry_alloc (e, e->size);
1345                 if (!e->data) break;
1346                 memcpy (e->data, "0210", 4);
1347                 break;
1348
1349         default:
1350                 break;
1351         }
1352 }