src/exif-common.c

   1 /*
   2  * Copyright (C) 2006 John Ellis
   3  * Copyright (C) 2008 - 2016 The Geeqie Team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program 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
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #  include "config.h"
  22 #endif
  23
  24 #define _XOPEN_SOURCE
  25
  26 #include <stdio.h>
  27 #include <string.h>
  28 #include <fcntl.h>
  29 #include <unistd.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/mman.h>
  33 #include <math.h>
  34
  35 #ifdef HAVE_LCMS
  36 /*** color support enabled ***/
  37
  38 #ifdef HAVE_LCMS2
  39 #include <lcms2.h>
  40 #else
  41 #include <lcms.h>
  42 #endif
  43 #endif
  44
  45 #include <glib.h>
  46
  47 #include "intl.h"
  48
  49 #include "main.h"
  50 #include "exif.h"
  51
  52 #include "filedata.h"
  53 #include "filefilter.h"
  54 #include "filecache.h"
  55 #include "format_raw.h"
  56 #include "ui_fileops.h"
  57 #include "cache.h"
  58 #include "jpeg_parser.h"
  59 #include "zonedetect.h"
  60
  61
  62 static gdouble exif_rational_to_double(ExifRational *r, gint sign)
  63 {
  64         if (!r || r->den == 0.0) return 0.0;
  65
  66         if (sign) return (gdouble)((gint)r->num) / (gdouble)((gint)r->den);
  67         return (gdouble)r->num / r->den;
  68 }
  69
  70 static gdouble exif_get_rational_as_double(ExifData *exif, const gchar *key)
  71 {
  72         ExifRational *r;
  73         gint sign;
  74
  75         r = exif_get_rational(exif, key, &sign);
  76         return exif_rational_to_double(r, sign);
  77 }
  78
  79 static GString *append_comma_text(GString *string, const gchar *text)
  80 {
  81         string = g_string_append(string, ", ");
  82         string = g_string_append(string, text);
  83
  84         return string;
  85 }
  86
  87 static gchar *remove_common_prefix(gchar *s, gchar *t)
  88 {
  89         gint i;
  90
  91         if (!s || !t) return t;
  92
  93         for (i = 0; s[i] && t[i] && s[i] == t[i]; i++)
  94                 ;
  95         if (!i)
  96                 return t;
  97         if (s[i-1] == ' ' || !s[i])
  98                 {
  99                 while (t[i] == ' ')
 100                         i++;
 101                 return t + i;
 102                 }
 103         return s;
 104 }
 105
 106 static gdouble get_crop_factor(ExifData *exif)
 107 {
 108         gdouble res_unit_tbl[] = {0.0, 25.4, 25.4, 10.0, 1.0, 0.001 };
 109         gdouble xres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneXResolution");
 110         gdouble yres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneYResolution");
 111         gint res_unit;
 112         gint w, h;
 113         gdouble xsize, ysize, size, ratio;
 114
 115         if (xres == 0.0 || yres == 0.0) return 0.0;
 116
 117         if (!exif_get_integer(exif, "Exif.Photo.FocalPlaneResolutionUnit", &res_unit)) return 0.0;
 118         if (res_unit < 1 || res_unit > 5) return 0.0;
 119
 120         if (!exif_get_integer(exif, "Exif.Photo.PixelXDimension", &w)) return 0.0;
 121         if (!exif_get_integer(exif, "Exif.Photo.PixelYDimension", &h)) return 0.0;
 122
 123         xsize = w * res_unit_tbl[res_unit] / xres;
 124         ysize = h * res_unit_tbl[res_unit] / yres;
 125
 126         ratio = xsize / ysize;
 127
 128         if (ratio < 0.5 || ratio > 2.0) return 0.0; /* reasonable ratio */
 129
 130         size = sqrt(xsize * xsize + ysize * ysize);
 131
 132         if (size < 1.0 || size > 100.0) return 0.0; /* reasonable sensor size in mm */
 133
 134         return sqrt(36*36+24*24) / size;
 135
 136 }
 137
 138 static gboolean remove_suffix(gchar *str, const gchar *suffix, gint suffix_len)
 139 {
 140         gint str_len = strlen(str);
 141
 142         if (suffix_len < 0) suffix_len = strlen(suffix);
 143         if (str_len < suffix_len) return FALSE;
 144
 145         if (strcmp(str + str_len - suffix_len, suffix) != 0) return FALSE;
 146         str[str_len - suffix_len] = '\0';
 147
 148         return TRUE;
 149 }
 150
 151 static gchar *exif_build_formatted_Camera(ExifData *exif)
 152 {
 153         gchar *text;
 154         gchar *make = exif_get_data_as_text(exif, "Exif.Image.Make");
 155         gchar *model = exif_get_data_as_text(exif, "Exif.Image.Model");
 156         gchar *software = exif_get_data_as_text(exif, "Exif.Image.Software");
 157         gchar *model2;
 158         gchar *software2;
 159
 160         if (make)
 161                 {
 162                 g_strstrip(make);
 163
 164                 if (remove_suffix(make, " CORPORATION", 12)) { /* Nikon */ }
 165                 else if (remove_suffix(make, " Corporation", 12)) { /* Pentax */ }
 166                 else if (remove_suffix(make, " OPTICAL CO.,LTD", 16)) { /* OLYMPUS */ };
 167                 }
 168
 169         if (model)
 170                 g_strstrip(model);
 171
 172         if (software)
 173                 {
 174                 gint i, j;
 175
 176                 g_strstrip(software);
 177
 178                 /* remove superfluous spaces (pentax K100D) */
 179                 for (i = 0, j = 0; software[i]; i++, j++)
 180                         {
 181                         if (software[i] == ' ' && software[i + 1] == ' ')
 182                                 i++;
 183                         if (i != j) software[j] = software[i];
 184                         }
 185                 software[j] = '\0';
 186                 }
 187
 188         model2 = remove_common_prefix(make, model);
 189         software2 = remove_common_prefix(model2, software);
 190
 191         text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", (make && model2) ? " " : "",
 192                                                (model2) ? model2 : "",
 193                                                (software2 && (make || model2)) ? " (" : "",
 194                                                (software2) ? software2 : "",
 195                                                (software2 && (make || model2)) ? ")" : "");
 196
 197         g_free(make);
 198         g_free(model);
 199         g_free(software);
 200         return text;
 201 }
 202
 203 static gchar *exif_build_formatted_DateTime(ExifData *exif)
 204 {
 205         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeOriginal");
 206         gchar *subsec = NULL;
 207         gchar buf[128];
 208         gchar *tmp;
 209         gint buflen;
 210         struct tm tm;
 211         GError *error = NULL;
 212
 213         if (text)
 214                 {
 215                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeOriginal");
 216                 }
 217         else
 218                 {
 219                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 220                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 221                 }
 222
 223         /* Convert the stuff into a tm struct */
 224         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 225         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 226                 {
 227                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 228                 if (buflen > 0)
 229                         {
 230                         tmp = g_locale_to_utf8(buf, buflen, NULL, NULL, &error);
 231                         if (error)
 232                                 {
 233                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 234                                 g_error_free(error);
 235                                 }
 236                         else
 237                                 {
 238                                 g_free(text);
 239                                 text = g_strdup(tmp);
 240                                 }
 241                         }
 242                 }
 243
 244         if (subsec)
 245                 {
 246                 tmp = text;
 247                 text = g_strconcat(tmp, ".", subsec, NULL);
 248                 g_free(tmp);
 249                 g_free(subsec);
 250                 }
 251         return text;
 252 }
 253
 254 static gchar *exif_build_formatted_DateTimeDigitized(ExifData *exif)
 255 {
 256         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeDigitized");
 257         gchar *subsec = NULL;
 258         gchar buf[128];
 259         gchar *tmp;
 260         gint buflen;
 261         struct tm tm;
 262         GError *error = NULL;
 263
 264         if (text)
 265                 {
 266                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeDigitized");
 267                 }
 268         else
 269                 {
 270                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 271                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 272                 }
 273
 274         /* Convert the stuff into a tm struct */
 275         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 276         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 277                 {
 278                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 279                 if (buflen > 0)
 280                         {
 281                         tmp = g_locale_to_utf8(buf, buflen, NULL, NULL, &error);
 282                         if (error)
 283                                 {
 284                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 285                                 g_error_free(error);
 286                                 }
 287                         else
 288                                 {
 289                                 g_free(text);
 290                                 text = g_strdup(tmp);
 291                                 }
 292                         }
 293                 }
 294
 295         if (subsec)
 296                 {
 297                 tmp = text;
 298                 text = g_strconcat(tmp, ".", subsec, NULL);
 299                 g_free(tmp);
 300                 g_free(subsec);
 301                 }
 302         return text;
 303 }
 304
 305 static gchar *exif_build_formatted_ShutterSpeed(ExifData *exif)
 306 {
 307         ExifRational *r;
 308
 309         r = exif_get_rational(exif, "Exif.Photo.ExposureTime", NULL);
 310         if (r && r->num && r->den)
 311                 {
 312                 gdouble n = (gdouble)r->den / (gdouble)r->num;
 313                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 314                                                   n > 1.0 ? n : 1.0 / n);
 315                 }
 316         r = exif_get_rational(exif, "Exif.Photo.ShutterSpeedValue", NULL);
 317         if (r && r->num  && r->den)
 318                 {
 319                 gdouble n = pow(2.0, exif_rational_to_double(r, TRUE));
 320
 321                 /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
 322                 if (n > 1.0 && (gint)n - ((gint)(n/10))*10 == 1) n--;
 323
 324                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 325                                                   n > 1.0 ? floor(n) : 1.0 / n);
 326                 }
 327         return NULL;
 328 }
 329
 330 static gchar *exif_build_formatted_Aperture(ExifData *exif)
 331 {
 332         gdouble n;
 333
 334         n = exif_get_rational_as_double(exif, "Exif.Photo.FNumber");
 335         if (n == 0.0) n = exif_get_rational_as_double(exif, "Exif.Photo.ApertureValue");
 336         if (n == 0.0) return NULL;
 337
 338         return g_strdup_printf("f/%.1f", n);
 339 }
 340
 341 static gchar *exif_build_formatted_ExposureBias(ExifData *exif)
 342 {
 343         ExifRational *r;
 344         gint sign;
 345         gdouble n;
 346
 347         r = exif_get_rational(exif, "Exif.Photo.ExposureBiasValue", &sign);
 348         if (!r) return NULL;
 349
 350         n = exif_rational_to_double(r, sign);
 351         return g_strdup_printf("%+.1f", n);
 352 }
 353
 354 static gchar *exif_build_formatted_FocalLength(ExifData *exif)
 355 {
 356         gdouble n;
 357
 358         n = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 359         if (n == 0.0) return NULL;
 360         return g_strdup_printf("%.0f mm", n);
 361 }
 362
 363 static gchar *exif_build_formatted_FocalLength35mmFilm(ExifData *exif)
 364 {
 365         gint n;
 366         gdouble f, c;
 367
 368         if (exif_get_integer(exif, "Exif.Photo.FocalLengthIn35mmFilm", &n) && n != 0)
 369                 {
 370                 return g_strdup_printf("%d mm", n);
 371                 }
 372
 373         f = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 374         if (f == 0.0) return NULL;
 375
 376         c = get_crop_factor(exif);
 377         if (c == 0.0) return NULL;
 378
 379         return g_strdup_printf("%.0f mm", f * c);
 380 }
 381
 382 static gchar *exif_build_formatted_ISOSpeedRating(ExifData *exif)
 383 {
 384         gchar *text;
 385
 386         text = exif_get_data_as_text(exif, "Exif.Photo.ISOSpeedRatings");
 387         /* old canon may set this instead */
 388         if (!text) text = exif_get_data_as_text(exif, "Exif.CanonSi.ISOSpeed");
 389         /* kodak may set this instead */
 390         if (!text) text = exif_get_data_as_text(exif, "Exif.Photo.ExposureIndex");
 391         return text;
 392 }
 393
 394 static gchar *exif_build_formatted_SubjectDistance(ExifData *exif)
 395 {
 396         ExifRational *r;
 397         gint sign;
 398         gdouble n;
 399
 400         r = exif_get_rational(exif, "Exif.Photo.SubjectDistance", &sign);
 401         if (!r) return NULL;
 402
 403         if ((glong)r->num == (glong)0xffffffff) return g_strdup(_("infinity"));
 404         if ((glong)r->num == 0) return g_strdup(_("unknown"));
 405
 406         n = exif_rational_to_double(r, sign);
 407         if (n == 0.0) return _("unknown");
 408         return g_strdup_printf("%.3f m", n);
 409 }
 410
 411 static gchar *exif_build_formatted_Flash(ExifData *exif)
 412 {
 413         /* grr, flash is a bitmask... */
 414         GString *string;
 415         gchar *text;
 416         gint n;
 417         gint v;
 418
 419         if (!exif_get_integer(exif, "Exif.Photo.Flash", &n)) return NULL;
 420
 421         /* Exif 2.1 only defines first 3 bits */
 422         if (n <= 0x07) return exif_get_data_as_text(exif, "Exif.Photo.Flash");
 423
 424         /* must be Exif 2.2 */
 425         string = g_string_new("");
 426
 427         /* flash fired (bit 0) */
 428         string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
 429
 430         /* flash mode (bits 3, 4) */
 431         v = (n >> 3) & 0x03;
 432         if (v) string = append_comma_text(string, _("mode:"));
 433         switch (v)
 434                 {
 435                 case 1:
 436                         string = g_string_append(string, _("on"));
 437                         break;
 438                 case 2:
 439                         string = g_string_append(string, _("off"));
 440                         break;
 441                 case 3:
 442                         string = g_string_append(string, _("auto"));
 443                         break;
 444                 }
 445
 446         /* return light (bits 1, 2) */
 447         v = (n >> 1) & 0x03;
 448         if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
 449         if (v == 3) string = append_comma_text(string, _("detected by strobe"));
 450
 451         /* we ignore flash function (bit 5) */
 452
 453         /* red-eye (bit 6) */
 454         if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
 455
 456         text = string->str;
 457         g_string_free(string, FALSE);
 458         return text;
 459 }
 460
 461 static gchar *exif_build_formatted_Resolution(ExifData *exif)
 462 {
 463         ExifRational *rx, *ry;
 464         gchar *units;
 465         gchar *text;
 466
 467         rx = exif_get_rational(exif, "Exif.Image.XResolution", NULL);
 468         ry = exif_get_rational(exif, "Exif.Image.YResolution", NULL);
 469         if (!rx || !ry) return NULL;
 470
 471         units = exif_get_data_as_text(exif, "Exif.Image.ResolutionUnit");
 472         text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? (gdouble)rx->num / rx->den : 1.0,
 473                                                       ry->den ? (gdouble)ry->num / ry->den : 1.0,
 474                                                       _("dot"), (units) ? units : _("unknown"));
 475
 476         g_free(units);
 477         return text;
 478 }
 479
 480 static gchar *exif_build_formatted_ColorProfile(ExifData *exif)
 481 {
 482 #ifdef HAVE_LCMS2
 483         cmsUInt8Number profileID[17];
 484 #endif
 485         const gchar *name = "";
 486         const gchar *source = "";
 487         guchar *profile_data;
 488         guint profile_len;
 489
 490         profile_data = exif_get_color_profile(exif, &profile_len);
 491         if (!profile_data)
 492                 {
 493                 gint cs;
 494                 gchar *interop_index;
 495
 496                 /* ColorSpace == 1 specifies sRGB per EXIF 2.2 */
 497                 if (!exif_get_integer(exif, "Exif.Photo.ColorSpace", &cs)) cs = 0;
 498                 interop_index = exif_get_data_as_text(exif, "Exif.Iop.InteroperabilityIndex");
 499
 500                 if (cs == 1)
 501                         {
 502                         name = _("sRGB");
 503                         source = "ColorSpace";
 504                         }
 505                 else if (cs == 2 || (interop_index && !strcmp(interop_index, "R03")))
 506                         {
 507                         name = _("AdobeRGB");
 508                         source = (cs == 2) ? "ColorSpace" : "Iop";
 509                         }
 510
 511                 g_free(interop_index);
 512                 }
 513         else
 514                 {
 515                 source = _("embedded");
 516 #ifdef HAVE_LCMS
 517
 518                         {
 519                         cmsHPROFILE profile;
 520
 521                         profile = cmsOpenProfileFromMem(profile_data, profile_len);
 522                         if (profile)
 523                                 {
 524 #ifdef HAVE_LCMS2
 525                                 profileID[16] = '\0';
 526                                 cmsGetHeaderProfileID(profile, profileID);
 527                                 name = (gchar *) profileID;
 528 #else
 529                                 name = (gchar *) cmsTakeProductName(profile);
 530 #endif
 531                                 cmsCloseProfile(profile);
 532                                 }
 533                         g_free(profile_data);
 534                         }
 535 #endif
 536                 }
 537         if (name[0] == 0 && source[0] == 0) return NULL;
 538         return g_strdup_printf("%s (%s)", name, source);
 539 }
 540
 541 static gchar *exif_build_formatted_GPSPosition(ExifData *exif)
 542 {
 543         GString *string;
 544         gchar *text, *ref;
 545         ExifRational *value;
 546         ExifItem *item;
 547         guint i;
 548         gdouble p, p3;
 549         gulong p1, p2;
 550
 551         string = g_string_new("");
 552
 553         item = exif_get_item(exif, "Exif.GPSInfo.GPSLatitude");
 554         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 555         if (item && ref)
 556                 {
 557                 p = 0;
 558                 for (i = 0; i < exif_item_get_elements(item); i++)
 559                         {
 560                         value = exif_item_get_rational(item, NULL, i);
 561                         if (value && value->num && value->den)
 562                                 p += (gdouble)value->num / (gdouble)value->den / pow(60.0, (gdouble)i);
 563                         }
 564                 p1 = (gint)p;
 565                 p2 = (gint)((p - p1)*60);
 566                 p3 = ((p - p1)*60 - p2)*60;
 567
 568                 g_string_append_printf(string, "%0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 569                 } // if (item && ref)
 570
 571         item = exif_get_item(exif, "Exif.GPSInfo.GPSLongitude");
 572         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 573         if (item && ref)
 574                 {
 575                 p = 0;
 576                 for (i = 0; i < exif_item_get_elements(item); i++)
 577                         {
 578                         value = exif_item_get_rational(item, NULL, i);
 579                         if (value && value->num && value->den)
 580                         p += (gdouble)value->num / (gdouble)value->den / pow(60.0, (gdouble)i);
 581                         }
 582                 p1 = (gint)p;
 583                 p2 = (gint)((p - p1)*60);
 584                 p3 = ((p - p1)*60 - p2)*60;
 585
 586                 g_string_append_printf(string, ", %0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 587                 } // if (item && ref)
 588
 589         text = string->str;
 590         g_string_free(string, FALSE);
 591
 592         return text;
 593 } // static gchar *exif_build_forma...
 594
 595 static gchar *exif_build_formatted_GPSAltitude(ExifData *exif)
 596 {
 597         ExifRational *r;
 598         ExifItem *item;
 599         gdouble alt;
 600         gint ref;
 601
 602         item = exif_get_item(exif, "Exif.GPSInfo.GPSAltitudeRef");
 603         r = exif_get_rational(exif, "Exif.GPSInfo.GPSAltitude", NULL);
 604
 605         if (!r || !item) return NULL;
 606
 607         alt = exif_rational_to_double(r, 0);
 608         exif_item_get_integer(item, &ref);
 609
 610         return g_strdup_printf("%0.f m %s", alt, (ref==0)?_("Above Sea Level"):_("Below Sea Level"));
 611 }
 612
 613 /**
 614  * @brief Extracts timezone from a ZoneDetect search structure
 615  * @param results ZoneDetect search structure
 616  * @returns Timezone in the form "Europe/London"
 617  *
 618  * Refer to https://github.com/BertoldVdb/ZoneDetect
 619  * for structure details
 620  */
 621 static gchar *zd_tz(ZoneDetectResult* results)
 622 {
 623         gchar *timezone = NULL;
 624         gchar *timezone_pre = NULL;
 625         gchar *timezone_id = NULL;
 626         unsigned int index = 0;
 627
 628     if (!results)
 629                 {
 630                 return NULL;
 631                 }
 632
 633         while(results[index].lookupResult != ZD_LOOKUP_END)
 634                 {
 635                 if(results[index].data)
 636                         {
 637                         for(unsigned int i=0; i<results[index].numFields; i++)
 638                                 {
 639                                 if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneIdPrefix"))
 640                                         {
 641                                         timezone_pre = g_strdup(results[index].data[i]);
 642                                         }
 643                                 if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneId"))
 644                                         {
 645                                         timezone_id = g_strdup(results[index].data[i]);
 646                                         }
 647                                 }
 648                         }
 649                 index++;
 650                 }
 651
 652         timezone = g_strconcat(timezone_pre, timezone_id, NULL);
 653         g_free(timezone_pre);
 654         g_free(timezone_id);
 655         return timezone;
 656 }
 657
 658 /**
 659  * @brief Creates local time from GPS lat/long
 660  * @param exif
 661  * @returns Localised time and date
 662  *
 663  * GPS lat/long is translated to timezone using ZoneDetect.
 664  * GPS UTC is converted to Unix time stamp (seconds since 1970).
 665  * The TZ environment variable is set to the relevant timezone
 666  * and the Unix timestamp converted to local time using locale.
 667  * If the conversion fails, unformatted UTC is returned.
 668  */
 669 static gchar *exif_build_formatted_localtime(ExifData *exif)
 670 {
 671         gfloat latitude;
 672         gfloat longitude;
 673         gchar *text_latitude;
 674         gchar *text_longitude;
 675         gchar *text_latitude_ref;
 676         gchar *text_longitude_ref;
 677         gchar *text_date;
 678         gchar *text_time;
 679         gchar *text_date_time = NULL;
 680         gchar buf[128];
 681         gchar *tmp;
 682         gint buflen;
 683         GError *error = NULL;
 684         gchar *lat_deg;
 685         gchar *lat_min;
 686         gchar *lon_deg;
 687         gchar *lon_min;
 688         gchar *time_zone;
 689         gchar *time_zone_org;
 690         struct tm *tm_local;
 691         struct tm tm_utc;
 692         time_t stamp;
 693         gchar *zd_path;
 694         gchar *zone_selected;
 695         ZoneDetect *cd;
 696         ZoneDetectResult *results;
 697
 698         text_latitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitude");
 699         text_longitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitude");
 700         text_latitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 701         text_longitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 702         text_date = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSDateStamp");
 703         text_time = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSTimeStamp");
 704
 705         if (text_latitude && text_longitude && text_latitude_ref &&
 706                                                 text_longitude_ref && text_date && text_time)
 707                 {
 708                 text_date_time = g_strconcat(text_date, ":", text_time, NULL);
 709
 710                 lat_deg = strtok(text_latitude, "deg'");
 711                 lat_min = strtok(NULL, "deg'");
 712                 latitude = atof(lat_deg) + atof(lat_min) / 60;
 713                 if (!g_strcmp0(text_latitude_ref, "South"))
 714                         {
 715                         latitude = -latitude;
 716                         }
 717                 lon_deg = strtok(text_longitude, "deg'");
 718                 lon_min = strtok(NULL, "deg'");
 719                 longitude = atof(lon_deg) + atof(lon_min) / 60;
 720                 if (!g_strcmp0(text_longitude_ref, "West"))
 721                         {
 722                         longitude = -longitude;
 723                         }
 724
 725                 zd_path = g_build_filename(GQ_BIN_DIR, TIMEZONE_DATABASE, NULL);
 726                 cd = ZDOpenDatabase(zd_path);
 727                 if (cd)
 728                         {
 729                         results = ZDLookup(cd, latitude, longitude, NULL);
 730                         zone_selected = zd_tz(results);
 731                         time_zone = g_strconcat("TZ=", zone_selected, NULL);
 732                         time_zone_org = g_strconcat("TZ=", getenv("TZ"), NULL);
 733                         putenv("TZ=UTC");
 734                         g_free(zone_selected);
 735
 736                         memset(&tm_utc, 0, sizeof(tm_utc));
 737                         if (text_date_time && strptime(text_date_time, "%Y:%m:%d:%H:%M:%S", &tm_utc))
 738                                 {
 739                                 stamp = mktime(&tm_utc);        // Convert the struct to a Unix timestamp
 740                                 putenv(time_zone);      // Switch to destination time zone
 741
 742                                 tm_local = localtime(&stamp);
 743
 744                                 /* Convert to localtime using locale */
 745                                 buflen = strftime(buf, sizeof(buf), "%x %X", tm_local);
 746                                 if (buflen > 0)
 747                                         {
 748                                         tmp = g_locale_to_utf8(buf, buflen, NULL, NULL, &error);
 749                                         if (error)
 750                                                 {
 751                                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 752                                                 g_error_free(error);
 753                                                 }
 754                                         else
 755                                                 {
 756                                                 g_free(text_date_time);
 757                                                 text_date_time = g_strdup(tmp);
 758                                                 }
 759                                         }
 760                                         g_free(tmp);
 761                                 }
 762                         putenv(time_zone_org);
 763
 764                         g_free(time_zone);
 765                         g_free(time_zone_org);
 766                         }
 767                 else
 768                         {
 769                         log_printf("Error: Init of timezone database %s failed\n", zd_path);
 770                         }
 771                 ZDCloseDatabase(cd);
 772                 g_free(zd_path);
 773                 }
 774
 775         g_free(text_latitude);
 776         g_free(text_longitude);
 777         g_free(text_latitude_ref);
 778         g_free(text_longitude_ref);
 779         g_free(text_date);
 780         g_free(text_time);
 781
 782         return text_date_time;
 783 }
 784
 785 /**
 786  * @brief Gets timezone from GPS lat/long
 787  * @param exif
 788  * @returns Timezone string in the form "Europe/London"
 789  *
 790  *
 791  */
 792 static gchar *exif_build_formatted_timezone(ExifData *exif)
 793 {
 794         gfloat latitude;
 795         gfloat longitude;
 796         gchar *text_latitude;
 797         gchar *text_longitude;
 798         gchar *text_latitude_ref;
 799         gchar *text_longitude_ref;
 800         gchar *lat_deg;
 801         gchar *lat_min;
 802         gchar *lon_deg;
 803         gchar *lon_min;
 804         gchar *time_zone = NULL;
 805         gchar *zd_path;
 806         ZoneDetect *cd;
 807         ZoneDetectResult *results;
 808
 809         text_latitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitude");
 810         text_longitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitude");
 811         text_latitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 812         text_longitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 813
 814         if (text_latitude && text_longitude && text_latitude_ref &&
 815                                                 text_longitude_ref)
 816                 {
 817                 lat_deg = strtok(text_latitude, "deg'");
 818                 lat_min = strtok(NULL, "deg'");
 819                 latitude = atof(lat_deg) + atof(lat_min) / 60;
 820                 if (g_strcmp0(text_latitude_ref, "South") == 0)
 821                         {
 822                         latitude = -latitude;
 823                         }
 824                 lon_deg = strtok(text_longitude, "deg'");
 825                 lon_min = strtok(NULL, "deg'");
 826                 longitude = atof(lon_deg) + atof(lon_min) / 60;
 827                 if (g_strcmp0(text_longitude_ref, "West") == 0)
 828                         {
 829                         longitude = -longitude;
 830                         }
 831                 zd_path = g_build_filename(GQ_BIN_DIR, TIMEZONE_DATABASE, NULL);
 832                 cd = ZDOpenDatabase(zd_path);
 833                 if (cd)
 834                         {
 835                         results = ZDLookup(cd, latitude, longitude, NULL);
 836                         time_zone = zd_tz(results);
 837                         ZDFreeResults(results);
 838                         }
 839                 else
 840                         {
 841                         log_printf("Error: Init of timezone database %s failed\n", zd_path);
 842                         }
 843                 ZDCloseDatabase(cd);
 844                 g_free(zd_path);
 845                 }
 846
 847         g_free(text_latitude);
 848         g_free(text_longitude);
 849         g_free(text_latitude_ref);
 850         g_free(text_longitude_ref);
 851
 852         return time_zone;
 853 }
 854
 855 /* List of custom formatted pseudo-exif tags */
 856 #define EXIF_FORMATTED_TAG(name, label) { EXIF_FORMATTED()#name, label, exif_build_formatted##_##name }
 857
 858 ExifFormattedText ExifFormattedList[] = {
 859         EXIF_FORMATTED_TAG(Camera,              N_("Camera")),
 860         EXIF_FORMATTED_TAG(DateTime,            N_("Date")),
 861         EXIF_FORMATTED_TAG(DateTimeDigitized,   N_("DateDigitized")),
 862         EXIF_FORMATTED_TAG(ShutterSpeed,        N_("Shutter speed")),
 863         EXIF_FORMATTED_TAG(Aperture,            N_("Aperture")),
 864         EXIF_FORMATTED_TAG(ExposureBias,        N_("Exposure bias")),
 865         EXIF_FORMATTED_TAG(ISOSpeedRating,      N_("ISO sensitivity")),
 866         EXIF_FORMATTED_TAG(FocalLength,         N_("Focal length")),
 867         EXIF_FORMATTED_TAG(FocalLength35mmFilm, N_("Focal length 35mm")),
 868         EXIF_FORMATTED_TAG(SubjectDistance,     N_("Subject distance")),
 869         EXIF_FORMATTED_TAG(Flash,               N_("Flash")),
 870         EXIF_FORMATTED_TAG(Resolution,          N_("Resolution")),
 871         EXIF_FORMATTED_TAG(ColorProfile,        N_("Color profile")),
 872         EXIF_FORMATTED_TAG(GPSPosition,         N_("GPS position")),
 873         EXIF_FORMATTED_TAG(GPSAltitude,         N_("GPS altitude")),
 874         EXIF_FORMATTED_TAG(localtime,           N_("Local time")),
 875         EXIF_FORMATTED_TAG(timezone,            N_("Time zone")),
 876         {"file.size",                           N_("File size"),        NULL},
 877         {"file.date",                           N_("File date"),        NULL},
 878         {"file.mode",                           N_("File mode"),        NULL},
 879         { NULL, NULL, NULL }
 880 };
 881
 882 gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gboolean *key_valid)
 883 {
 884         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0)
 885                 {
 886                 gint i;
 887
 888                 if (key_valid) *key_valid = TRUE;
 889
 890                 key += EXIF_FORMATTED_LEN;
 891                 for (i = 0; ExifFormattedList[i].key; i++)
 892                         if (ExifFormattedList[i].build_func && strcmp(key, ExifFormattedList[i].key + EXIF_FORMATTED_LEN) == 0)
 893                                 return ExifFormattedList[i].build_func(exif);
 894                 }
 895
 896         if (key_valid) *key_valid = FALSE;
 897         return NULL;
 898 }
 899
 900 gchar *exif_get_description_by_key(const gchar *key)
 901 {
 902         if (!key) return NULL;
 903
 904         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0 ||
 905             strncmp(key, "file.", 5) == 0)
 906                 {
 907                 gint i;
 908
 909                 for (i = 0; ExifFormattedList[i].key; i++)
 910                         if (strcmp(key, ExifFormattedList[i].key) == 0)
 911                                 return g_strdup(_(ExifFormattedList[i].description));
 912                 }
 913
 914         return exif_get_tag_description_by_key(key);
 915 }
 916
 917 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
 918 {
 919         ExifItem *item;
 920
 921         item = exif_get_item(exif, key);
 922         return exif_item_get_integer(item, value);
 923 }
 924
 925 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
 926 {
 927         ExifItem *item;
 928
 929         item = exif_get_item(exif, key);
 930         return exif_item_get_rational(item, sign, 0);
 931 }
 932
 933 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
 934 {
 935         ExifItem *item;
 936         gchar *text;
 937         gboolean key_valid;
 938
 939         if (!key) return NULL;
 940
 941         text = exif_get_formatted_by_key(exif, key, &key_valid);
 942         if (key_valid) return text;
 943
 944         item = exif_get_item(exif, key);
 945         if (item) return exif_item_get_data_as_text(item);
 946
 947         return NULL;
 948 }
 949
 950
 951 static FileCacheData *exif_cache;
 952
 953 void exif_release_cb(FileData *fd)
 954 {
 955         exif_free(fd->exif);
 956         fd->exif = NULL;
 957 }
 958
 959 void exif_init_cache(void)
 960 {
 961         g_assert(!exif_cache);
 962         exif_cache = file_cache_new(exif_release_cb, 4);
 963 }
 964
 965 ExifData *exif_read_fd(FileData *fd)
 966 {
 967         gchar *sidecar_path;
 968
 969         if (!exif_cache) exif_init_cache();
 970
 971         if (!fd) return NULL;
 972
 973         if (file_cache_get(exif_cache, fd)) return fd->exif;
 974         g_assert(fd->exif == NULL);
 975
 976         /* CACHE_TYPE_XMP_METADATA file should exist only if the metadata are
 977          * not writable directly, thus it should contain the most up-to-date version */
 978         sidecar_path = NULL;
 979
 980 #ifdef HAVE_EXIV2
 981         /* we are not able to handle XMP sidecars without exiv2 */
 982         sidecar_path = cache_find_location(CACHE_TYPE_XMP_METADATA, fd->path);
 983
 984         if (!sidecar_path) sidecar_path = file_data_get_sidecar_path(fd, TRUE);
 985 #endif
 986
 987         fd->exif = exif_read(fd->path, sidecar_path, fd->modified_xmp);
 988
 989         g_free(sidecar_path);
 990         file_cache_put(exif_cache, fd, 1);
 991         return fd->exif;
 992 }
 993
 994
 995 void exif_free_fd(FileData *fd, ExifData *exif)
 996 {
 997         if (!fd) return;
 998         g_assert(fd->exif == exif);
 999 }
1000
1001 /* embedded icc in jpeg */
1002
1003 gboolean exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
1004 {
1005         guint seg_offset = 0;
1006         guint seg_length = 0;
1007         guint chunk_offset[255];
1008         guint chunk_length[255];
1009         guint chunk_count = 0;
1010
1011         /* For jpeg/jfif, ICC color profile data can be in more than one segment.
1012            the data is in APP2 data segments that start with "ICC_PROFILE\x00\xNN\xTT"
1013            NN = segment number for data
1014            TT = total number of ICC segments (TT in each ICC segment should match)
1015          */
1016
1017         while (jpeg_segment_find(data + seg_offset + seg_length,
1018                                       size - seg_offset - seg_length,
1019                                       JPEG_MARKER_APP2,
1020                                       "ICC_PROFILE\x00", 12,
1021                                       &seg_offset, &seg_length))
1022                 {
1023                 guchar chunk_num;
1024                 guchar chunk_tot;
1025
1026                 if (seg_length < 14) return FALSE;
1027
1028                 chunk_num = data[seg_offset + 12];
1029                 chunk_tot = data[seg_offset + 13];
1030
1031                 if (chunk_num == 0 || chunk_tot == 0) return FALSE;
1032
1033                 if (chunk_count == 0)
1034                         {
1035                         guint i;
1036
1037                         chunk_count = (guint)chunk_tot;
1038                         for (i = 0; i < chunk_count; i++) chunk_offset[i] = 0;
1039                         for (i = 0; i < chunk_count; i++) chunk_length[i] = 0;
1040                         }
1041
1042                 if (chunk_tot != chunk_count ||
1043                     chunk_num > chunk_count) return FALSE;
1044
1045                 chunk_num--;
1046                 chunk_offset[chunk_num] = seg_offset + 14;
1047                 chunk_length[chunk_num] = seg_length - 14;
1048                 }
1049
1050         if (chunk_count > 0)
1051                 {
1052                 guchar *cp_data;
1053                 guint cp_length = 0;
1054                 guint i;
1055
1056                 for (i = 0; i < chunk_count; i++) cp_length += chunk_length[i];
1057                 cp_data = g_malloc(cp_length);
1058
1059                 for (i = 0; i < chunk_count; i++)
1060                         {
1061                         if (chunk_offset[i] == 0)
1062                                 {
1063                                 /* error, we never saw this chunk */
1064                                 g_free(cp_data);
1065                                 return FALSE;
1066                                 }
1067                         memcpy(cp_data, data + chunk_offset[i], chunk_length[i]);
1068                         }
1069                 DEBUG_1("Found embedded icc profile in jpeg");
1070                 exif_add_jpeg_color_profile(exif, cp_data, cp_length);
1071
1072                 return TRUE;
1073                 }
1074
1075         return FALSE;
1076 }
1077
1078 /*
1079  *-------------------------------------------------------------------
1080  * file info
1081  * it is here because it shares tag neming infrastructure with exif
1082  * we should probably not invest too much effort into this because
1083  * new exiv2 will support the same functionality
1084  * http://dev.exiv2.org/issues/show/505
1085  *-------------------------------------------------------------------
1086  */
1087
1088 static gchar *mode_number(mode_t m)
1089 {
1090         gint mb, mu, mg, mo;
1091         gchar pbuf[12];
1092
1093         mb = mu = mg = mo = 0;
1094
1095         if (m & S_ISUID) mb |= 4;
1096         if (m & S_ISGID) mb |= 2;
1097         if (m & S_ISVTX) mb |= 1;
1098
1099         if (m & S_IRUSR) mu |= 4;
1100         if (m & S_IWUSR) mu |= 2;
1101         if (m & S_IXUSR) mu |= 1;
1102
1103         if (m & S_IRGRP) mg |= 4;
1104         if (m & S_IWGRP) mg |= 2;
1105         if (m & S_IXGRP) mg |= 1;
1106
1107         if (m & S_IROTH) mo |= 4;
1108         if (m & S_IWOTH) mo |= 2;
1109         if (m & S_IXOTH) mo |= 1;
1110
1111         pbuf[0] = (m & S_IRUSR) ? 'r' : '-';
1112         pbuf[1] = (m & S_IWUSR) ? 'w' : '-';
1113         pbuf[2] = (m & S_IXUSR) ? 'x' : '-';
1114         pbuf[3] = (m & S_IRGRP) ? 'r' : '-';
1115         pbuf[4] = (m & S_IWGRP) ? 'w' : '-';
1116         pbuf[5] = (m & S_IXGRP) ? 'x' : '-';
1117         pbuf[6] = (m & S_IROTH) ? 'r' : '-';
1118         pbuf[7] = (m & S_IWOTH) ? 'w' : '-';
1119         pbuf[8] = (m & S_IXOTH) ? 'x' : '-';
1120         pbuf[9] = '\0';
1121
1122         return g_strdup_printf("%s (%d%d%d%d)", pbuf, mb, mu, mg, mo);
1123 }
1124
1125 gchar *metadata_file_info(FileData *fd, const gchar *key, MetadataFormat format)
1126 {
1127         if (strcmp(key, "file.size") == 0)
1128                 {
1129                 return g_strdup_printf("%ld", (long)fd->size);
1130                 }
1131         if (strcmp(key, "file.date") == 0)
1132                 {
1133                 return g_strdup(text_from_time(fd->date));
1134                 }
1135         if (strcmp(key, "file.mode") == 0)
1136                 {
1137                 return mode_number(fd->mode);
1138                 }
1139         return g_strdup("");
1140 }
1141
1142
1143 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */