src/exif-common.cc

   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 #include <config.h>
  21
  22 #define _XOPEN_SOURCE
  23
  24 #include <cmath>
  25 #include <cstdlib>
  26 #include <cstring>
  27
  28 #ifdef HAVE_LCMS
  29 /*** color support enabled ***/
  30
  31 #ifdef HAVE_LCMS2
  32 #include <lcms2.h>
  33 #else
  34 #include <lcms.h>
  35 #endif
  36 #endif
  37
  38 #include "main.h"
  39 #include "exif.h"
  40
  41 #include "filecache.h"
  42 #include "glua.h"
  43 #include "ui-fileops.h"
  44 #include "cache.h"
  45 #include "jpeg-parser.h"
  46 #include "misc.h"
  47 #include "zonedetect.h"
  48
  49
  50 static gdouble exif_rational_to_double(ExifRational *r, gint sign)
  51 {
  52         if (!r || r->den == 0.0) return 0.0;
  53
  54         if (sign) return static_cast<gdouble>(static_cast<gint>(r->num)) / static_cast<gdouble>(static_cast<gint>(r->den));
  55         return static_cast<gdouble>(r->num) / r->den;
  56 }
  57
  58 static gdouble exif_get_rational_as_double(ExifData *exif, const gchar *key)
  59 {
  60         ExifRational *r;
  61         gint sign;
  62
  63         r = exif_get_rational(exif, key, &sign);
  64         return exif_rational_to_double(r, sign);
  65 }
  66
  67 static GString *append_comma_text(GString *string, const gchar *text)
  68 {
  69         string = g_string_append(string, ", ");
  70         string = g_string_append(string, text);
  71
  72         return string;
  73 }
  74
  75 static gchar *remove_common_prefix(gchar *s, gchar *t)
  76 {
  77         gint i;
  78
  79         if (!s || !t) return t;
  80
  81         for (i = 0; s[i] && t[i] && s[i] == t[i]; i++)
  82                 ;
  83         if (!i)
  84                 return t;
  85         if (s[i-1] == ' ' || !s[i])
  86                 {
  87                 while (t[i] == ' ')
  88                         i++;
  89                 return t + i;
  90                 }
  91         return s;
  92 }
  93
  94 static gdouble get_crop_factor(ExifData *exif)
  95 {
  96         gdouble res_unit_tbl[] = {0.0, 25.4, 25.4, 10.0, 1.0, 0.001 };
  97         gdouble xres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneXResolution");
  98         gdouble yres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneYResolution");
  99         gint res_unit;
 100         gint w, h;
 101         gdouble xsize, ysize, size, ratio;
 102
 103         if (xres == 0.0 || yres == 0.0) return 0.0;
 104
 105         if (!exif_get_integer(exif, "Exif.Photo.FocalPlaneResolutionUnit", &res_unit)) return 0.0;
 106         if (res_unit < 1 || res_unit > 5) return 0.0;
 107
 108         if (!exif_get_integer(exif, "Exif.Photo.PixelXDimension", &w)) return 0.0;
 109         if (!exif_get_integer(exif, "Exif.Photo.PixelYDimension", &h)) return 0.0;
 110
 111         xsize = w * res_unit_tbl[res_unit] / xres;
 112         ysize = h * res_unit_tbl[res_unit] / yres;
 113
 114         ratio = xsize / ysize;
 115
 116         if (ratio < 0.5 || ratio > 2.0) return 0.0; /* reasonable ratio */
 117
 118         size = sqrt(xsize * xsize + ysize * ysize);
 119
 120         if (size < 1.0 || size > 100.0) return 0.0; /* reasonable sensor size in mm */
 121
 122         return sqrt(36*36+24*24) / size;
 123
 124 }
 125
 126 static gboolean remove_suffix(gchar *str, const gchar *suffix, gint suffix_len)
 127 {
 128         gint str_len = strlen(str);
 129
 130         if (suffix_len < 0) suffix_len = strlen(suffix);
 131         if (str_len < suffix_len) return FALSE;
 132
 133         if (strcmp(str + str_len - suffix_len, suffix) != 0) return FALSE;
 134         str[str_len - suffix_len] = '\0';
 135
 136         return TRUE;
 137 }
 138
 139 static gchar *exif_build_formatted_Camera(ExifData *exif)
 140 {
 141         gchar *text;
 142         gchar *make = exif_get_data_as_text(exif, "Exif.Image.Make");
 143         gchar *model = exif_get_data_as_text(exif, "Exif.Image.Model");
 144         gchar *software = exif_get_data_as_text(exif, "Exif.Image.Software");
 145         gchar *model2;
 146         gchar *software2;
 147
 148         if (make)
 149                 {
 150                 g_strstrip(make);
 151
 152                 if (remove_suffix(make, " CORPORATION", 12)) { /* Nikon */ }
 153                 else if (remove_suffix(make, " Corporation", 12)) { /* Pentax */ }
 154                 else if (remove_suffix(make, " OPTICAL CO.,LTD", 16)) { /* OLYMPUS */ };
 155                 }
 156
 157         if (model)
 158                 g_strstrip(model);
 159
 160         if (software)
 161                 {
 162                 gint i, j;
 163
 164                 g_strstrip(software);
 165
 166                 /* remove superfluous spaces (pentax K100D) */
 167                 for (i = 0, j = 0; software[i]; i++, j++)
 168                         {
 169                         if (software[i] == ' ' && software[i + 1] == ' ')
 170                                 i++;
 171                         if (i != j) software[j] = software[i];
 172                         }
 173                 software[j] = '\0';
 174                 }
 175
 176         model2 = remove_common_prefix(make, model);
 177         software2 = remove_common_prefix(model2, software);
 178
 179         text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", (make && model2) ? " " : "",
 180                                                (model2) ? model2 : "",
 181                                                (software2 && (make || model2)) ? " (" : "",
 182                                                (software2) ? software2 : "",
 183                                                (software2 && (make || model2)) ? ")" : "");
 184
 185         g_free(make);
 186         g_free(model);
 187         g_free(software);
 188         return text;
 189 }
 190
 191 static gchar *exif_build_formatted_DateTime(ExifData *exif)
 192 {
 193         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeOriginal");
 194         gchar *subsec = nullptr;
 195         gchar buf[128];
 196         gchar *tmp;
 197         gint buflen;
 198         struct tm tm;
 199         GError *error = nullptr;
 200
 201         if (text)
 202                 {
 203                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeOriginal");
 204                 }
 205         else
 206                 {
 207                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 208                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 209                 }
 210
 211         /* Convert the stuff into a tm struct */
 212         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 213         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 214                 {
 215                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 216                 if (buflen > 0)
 217                         {
 218                         tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 219                         if (error)
 220                                 {
 221                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 222                                 g_error_free(error);
 223                                 }
 224                         else
 225                                 {
 226                                 g_free(text);
 227                                 text = g_strdup(tmp);
 228                                 }
 229                         }
 230                 }
 231
 232         if (subsec)
 233                 {
 234                 tmp = text;
 235                 text = g_strconcat(tmp, ".", subsec, NULL);
 236                 g_free(tmp);
 237                 g_free(subsec);
 238                 }
 239         return text;
 240 }
 241
 242 static gchar *exif_build_formatted_DateTimeDigitized(ExifData *exif)
 243 {
 244         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeDigitized");
 245         gchar *subsec = nullptr;
 246         gchar buf[128];
 247         gchar *tmp;
 248         gint buflen;
 249         struct tm tm;
 250         GError *error = nullptr;
 251
 252         if (text)
 253                 {
 254                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeDigitized");
 255                 }
 256         else
 257                 {
 258                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 259                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 260                 }
 261
 262         /* Convert the stuff into a tm struct */
 263         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 264         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 265                 {
 266                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 267                 if (buflen > 0)
 268                         {
 269                         tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 270                         if (error)
 271                                 {
 272                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 273                                 g_error_free(error);
 274                                 }
 275                         else
 276                                 {
 277                                 g_free(text);
 278                                 text = g_strdup(tmp);
 279                                 }
 280                         }
 281                 }
 282
 283         if (subsec)
 284                 {
 285                 tmp = text;
 286                 text = g_strconcat(tmp, ".", subsec, NULL);
 287                 g_free(tmp);
 288                 g_free(subsec);
 289                 }
 290         return text;
 291 }
 292
 293 static gchar *exif_build_formatted_ShutterSpeed(ExifData *exif)
 294 {
 295         ExifRational *r;
 296
 297         r = exif_get_rational(exif, "Exif.Photo.ExposureTime", nullptr);
 298         if (r && r->num && r->den)
 299                 {
 300                 gdouble n = static_cast<gdouble>(r->den) / static_cast<gdouble>(r->num);
 301                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 302                                                   n > 1.0 ? n : 1.0 / n);
 303                 }
 304         r = exif_get_rational(exif, "Exif.Photo.ShutterSpeedValue", nullptr);
 305         if (r && r->num  && r->den)
 306                 {
 307                 gdouble n = pow(2.0, exif_rational_to_double(r, TRUE));
 308
 309                 /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
 310                 if (n > 1.0 && static_cast<gint>(n) - (static_cast<gint>(n/10))*10 == 1) n--;
 311
 312                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 313                                                   n > 1.0 ? floor(n) : 1.0 / n);
 314                 }
 315         return nullptr;
 316 }
 317
 318 static gchar *exif_build_formatted_Aperture(ExifData *exif)
 319 {
 320         gdouble n;
 321
 322         n = exif_get_rational_as_double(exif, "Exif.Photo.FNumber");
 323         if (n == 0.0) n = exif_get_rational_as_double(exif, "Exif.Photo.ApertureValue");
 324         if (n == 0.0) return nullptr;
 325
 326         return g_strdup_printf("f/%.1f", n);
 327 }
 328
 329 static gchar *exif_build_formatted_ExposureBias(ExifData *exif)
 330 {
 331         ExifRational *r;
 332         gint sign;
 333         gdouble n;
 334
 335         r = exif_get_rational(exif, "Exif.Photo.ExposureBiasValue", &sign);
 336         if (!r) return nullptr;
 337
 338         n = exif_rational_to_double(r, sign);
 339         return g_strdup_printf("%+.1f", n);
 340 }
 341
 342 static gchar *exif_build_formatted_FocalLength(ExifData *exif)
 343 {
 344         gdouble n;
 345
 346         n = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 347         if (n == 0.0) return nullptr;
 348         return g_strdup_printf("%.0f mm", n);
 349 }
 350
 351 static gchar *exif_build_formatted_FocalLength35mmFilm(ExifData *exif)
 352 {
 353         gint n;
 354         gdouble f, c;
 355
 356         if (exif_get_integer(exif, "Exif.Photo.FocalLengthIn35mmFilm", &n) && n != 0)
 357                 {
 358                 return g_strdup_printf("%d mm", n);
 359                 }
 360
 361         f = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 362         if (f == 0.0) return nullptr;
 363
 364         c = get_crop_factor(exif);
 365         if (c == 0.0) return nullptr;
 366
 367         return g_strdup_printf("%.0f mm", f * c);
 368 }
 369
 370 static gchar *exif_build_formatted_ISOSpeedRating(ExifData *exif)
 371 {
 372         gchar *text;
 373
 374         text = exif_get_data_as_text(exif, "Exif.Photo.ISOSpeedRatings");
 375         /* old canon may set this instead */
 376         if (!text) text = exif_get_data_as_text(exif, "Exif.CanonSi.ISOSpeed");
 377         /* kodak may set this instead */
 378         if (!text) text = exif_get_data_as_text(exif, "Exif.Photo.ExposureIndex");
 379         return text;
 380 }
 381
 382 static gchar *exif_build_formatted_SubjectDistance(ExifData *exif)
 383 {
 384         ExifRational *r;
 385         gint sign;
 386         gdouble n;
 387
 388         r = exif_get_rational(exif, "Exif.Photo.SubjectDistance", &sign);
 389         if (!r) return nullptr;
 390
 391         if (static_cast<glong>(r->num) == static_cast<glong>(0xffffffff)) return g_strdup(_("infinity"));
 392         if (static_cast<glong>(r->num) == 0) return g_strdup(_("unknown"));
 393
 394         n = exif_rational_to_double(r, sign);
 395         if (n == 0.0) return _("unknown");
 396         return g_strdup_printf("%.3f m", n);
 397 }
 398
 399 static gchar *exif_build_formatted_Flash(ExifData *exif)
 400 {
 401         /* grr, flash is a bitmask... */
 402         GString *string;
 403         gchar *text;
 404         gint n;
 405         gint v;
 406
 407         if (!exif_get_integer(exif, "Exif.Photo.Flash", &n)) return nullptr;
 408
 409         /* Exif 2.1 only defines first 3 bits */
 410         if (n <= 0x07) return exif_get_data_as_text(exif, "Exif.Photo.Flash");
 411
 412         /* must be Exif 2.2 */
 413         string = g_string_new("");
 414
 415         /* flash fired (bit 0) */
 416         string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
 417
 418         /* flash mode (bits 3, 4) */
 419         v = (n >> 3) & 0x03;
 420         if (v) string = append_comma_text(string, _("mode:"));
 421         switch (v)
 422                 {
 423                 case 1:
 424                         string = g_string_append(string, _("on"));
 425                         break;
 426                 case 2:
 427                         string = g_string_append(string, _("off"));
 428                         break;
 429                 case 3:
 430                         string = g_string_append(string, _("auto"));
 431                         break;
 432                 }
 433
 434         /* return light (bits 1, 2) */
 435         v = (n >> 1) & 0x03;
 436         if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
 437         if (v == 3) string = append_comma_text(string, _("detected by strobe"));
 438
 439         /* we ignore flash function (bit 5) */
 440
 441         /* red-eye (bit 6) */
 442         if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
 443
 444         text = g_strdup(string->str);
 445         g_string_free(string, TRUE);
 446
 447         return text;
 448 }
 449
 450 static gchar *exif_build_formatted_Resolution(ExifData *exif)
 451 {
 452         ExifRational *rx, *ry;
 453         gchar *units;
 454         gchar *text;
 455
 456         rx = exif_get_rational(exif, "Exif.Image.XResolution", nullptr);
 457         ry = exif_get_rational(exif, "Exif.Image.YResolution", nullptr);
 458         if (!rx || !ry) return nullptr;
 459
 460         units = exif_get_data_as_text(exif, "Exif.Image.ResolutionUnit");
 461         text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? static_cast<gdouble>(rx->num) / rx->den : 1.0,
 462                                                       ry->den ? static_cast<gdouble>(ry->num) / ry->den : 1.0,
 463                                                       _("dot"), (units) ? units : _("unknown"));
 464
 465         g_free(units);
 466         return text;
 467 }
 468
 469 static gchar *exif_build_formatted_ColorProfile(ExifData *exif)
 470 {
 471 #ifdef HAVE_LCMS2
 472         cmsUInt8Number profileID[17];
 473 #endif
 474         const gchar *name = "";
 475         const gchar *source = "";
 476         guchar *profile_data;
 477         guint profile_len;
 478
 479         profile_data = exif_get_color_profile(exif, &profile_len);
 480         if (!profile_data)
 481                 {
 482                 gint cs;
 483                 gchar *interop_index;
 484
 485                 /* ColorSpace == 1 specifies sRGB per EXIF 2.2 */
 486                 if (!exif_get_integer(exif, "Exif.Photo.ColorSpace", &cs)) cs = 0;
 487                 interop_index = exif_get_data_as_text(exif, "Exif.Iop.InteroperabilityIndex");
 488
 489                 if (cs == 1)
 490                         {
 491                         name = _("sRGB");
 492                         source = "ColorSpace";
 493                         }
 494                 else if (cs == 2 || (interop_index && !strcmp(interop_index, "R03")))
 495                         {
 496                         name = _("AdobeRGB");
 497                         source = (cs == 2) ? "ColorSpace" : "Iop";
 498                         }
 499
 500                 g_free(interop_index);
 501                 }
 502         else
 503                 {
 504                 source = _("embedded");
 505 #ifdef HAVE_LCMS
 506
 507                         {
 508                         cmsHPROFILE profile;
 509
 510                         profile = cmsOpenProfileFromMem(profile_data, profile_len);
 511                         if (profile)
 512                                 {
 513 #ifdef HAVE_LCMS2
 514                                 profileID[16] = '\0';
 515                                 cmsGetHeaderProfileID(profile, profileID);
 516                                 name = reinterpret_cast<gchar *>(profileID);
 517 #else
 518                                 name = (gchar *) cmsTakeProductName(profile);
 519 #endif
 520                                 cmsCloseProfile(profile);
 521                                 }
 522                         g_free(profile_data);
 523                         }
 524 #endif
 525                 }
 526         if (name[0] == 0 && source[0] == 0) return nullptr;
 527         return g_strdup_printf("%s (%s)", name, source);
 528 }
 529
 530 static gchar *exif_build_formatted_GPSPosition(ExifData *exif)
 531 {
 532         GString *string;
 533         gchar *text, *ref;
 534         ExifRational *value;
 535         ExifItem *item;
 536         guint i;
 537         gdouble p, p3;
 538         gulong p1, p2;
 539
 540         string = g_string_new("");
 541
 542         item = exif_get_item(exif, "Exif.GPSInfo.GPSLatitude");
 543         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 544         if (item && ref)
 545                 {
 546                 p = 0;
 547                 for (i = 0; i < exif_item_get_elements(item); i++)
 548                         {
 549                         value = exif_item_get_rational(item, nullptr, i);
 550                         if (value && value->num && value->den)
 551                                 p += static_cast<gdouble>(value->num) / static_cast<gdouble>(value->den) / pow(60.0, static_cast<gdouble>(i));
 552                         }
 553                 p1 = static_cast<gint>(p);
 554                 p2 = static_cast<gint>((p - p1)*60);
 555                 p3 = ((p - p1)*60 - p2)*60;
 556
 557                 g_string_append_printf(string, "%0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 558                 } // if (item && ref)
 559
 560         item = exif_get_item(exif, "Exif.GPSInfo.GPSLongitude");
 561         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 562         if (item && ref)
 563                 {
 564                 p = 0;
 565                 for (i = 0; i < exif_item_get_elements(item); i++)
 566                         {
 567                         value = exif_item_get_rational(item, nullptr, i);
 568                         if (value && value->num && value->den)
 569                         p += static_cast<gdouble>(value->num) / static_cast<gdouble>(value->den) / pow(60.0, static_cast<gdouble>(i));
 570                         }
 571                 p1 = static_cast<gint>(p);
 572                 p2 = static_cast<gint>((p - p1)*60);
 573                 p3 = ((p - p1)*60 - p2)*60;
 574
 575                 g_string_append_printf(string, ", %0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 576                 } // if (item && ref)
 577
 578         text = g_strdup(string->str);
 579         g_string_free(string, TRUE);
 580
 581         return text;
 582 } // static gchar *exif_build_forma...
 583
 584 static gchar *exif_build_formatted_GPSAltitude(ExifData *exif)
 585 {
 586         ExifRational *r;
 587         ExifItem *item;
 588         gdouble alt;
 589         gint ref;
 590
 591         item = exif_get_item(exif, "Exif.GPSInfo.GPSAltitudeRef");
 592         r = exif_get_rational(exif, "Exif.GPSInfo.GPSAltitude", nullptr);
 593
 594         if (!r || !item) return nullptr;
 595
 596         alt = exif_rational_to_double(r, 0);
 597         exif_item_get_integer(item, &ref);
 598
 599         return g_strdup_printf("%0.f m %s", alt, (ref==0)?_("Above Sea Level"):_("Below Sea Level"));
 600 }
 601
 602 /**
 603  * @brief Extracts timezone data from a ZoneDetect search structure
 604  * @param[in] results ZoneDetect search structure
 605  * @param[out] timezone in the form "Europe/London"
 606  * @param[out] countryname in the form "United Kingdom"
 607  * @param[out] countryalpha2 in the form "GB"
 608  *
 609  * Refer to https://github.com/BertoldVdb/ZoneDetect
 610  * for structure details
 611  */
 612 static void zd_tz(ZoneDetectResult *results, gchar **timezone, gchar **countryname, gchar **countryalpha2)
 613 {
 614         gchar *timezone_pre = nullptr;
 615         gchar *timezone_id = nullptr;
 616         unsigned int index = 0;
 617
 618         while(results[index].lookupResult != ZD_LOOKUP_END)
 619                 {
 620                 if(results[index].data)
 621                         {
 622                         for(unsigned int i=0; i<results[index].numFields; i++)
 623                                 {
 624                                 if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneIdPrefix"))
 625                                         {
 626                                         timezone_pre = g_strdup(results[index].data[i]);
 627                                         }
 628                                 if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneId"))
 629                                         {
 630                                         timezone_id = g_strdup(results[index].data[i]);
 631                                         }
 632                                 if (g_strstr_len(results[index].fieldNames[i], -1, "CountryName"))
 633                                         {
 634                                         *countryname = g_strdup(results[index].data[i]);
 635                                         }
 636                                 if (g_strstr_len(results[index].fieldNames[i], -1, "CountryAlpha2"))
 637                                         {
 638                                         *countryalpha2 = g_strdup(results[index].data[i]);
 639                                         }
 640                                 }
 641                         }
 642                 index++;
 643                 }
 644
 645         *timezone = g_strconcat(timezone_pre, timezone_id, NULL);
 646         g_free(timezone_pre);
 647         g_free(timezone_id);
 648 }
 649
 650 void ZoneDetect_onError(int errZD, int errNative)
 651 {
 652         log_printf("Error: ZoneDetect %s (0x%08X)\n", ZDGetErrorString(errZD), (unsigned)errNative);
 653 }
 654
 655 /**
 656  * @brief Gets timezone data from an exif structure
 657  * @param[in] exif
 658  * @returns TRUE if timezone data found AND GPS date and time found
 659  * @param[out] exif_date_time exif date/time in the form 2018:11:30:17:05:04
 660  * @param[out] timezone in the form "Europe/London"
 661  * @param[out] countryname in the form "United Kingdom"
 662  * @param[out] countryalpha2 in the form "GB"
 663  *
 664  *
 665  */
 666 static gboolean exif_build_tz_data(ExifData *exif, gchar **exif_date_time, gchar **timezone, gchar **countryname, gchar **countryalpha2)
 667 {
 668         gfloat latitude;
 669         gfloat longitude;
 670         gchar *text_latitude;
 671         gchar *text_longitude;
 672         gchar *text_latitude_ref;
 673         gchar *text_longitude_ref;
 674         gchar *text_date;
 675         gchar *text_time;
 676         gchar *lat_deg;
 677         gchar *lat_min;
 678         gchar *lon_deg;
 679         gchar *lon_min;
 680         gchar *timezone_path;
 681         ZoneDetect *cd;
 682         ZoneDetectResult *results;
 683         gboolean ret = FALSE;
 684
 685         text_latitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitude");
 686         text_longitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitude");
 687         text_latitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 688         text_longitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 689         text_date = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSDateStamp");
 690         text_time = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSTimeStamp");
 691
 692         if (text_latitude && text_longitude && text_latitude_ref && text_longitude_ref)
 693                 {
 694                 lat_deg = strtok(text_latitude, "deg'");
 695                 lat_min = strtok(nullptr, "deg'");
 696                 if (!lat_deg || !lat_min)
 697                         {
 698                         return FALSE;
 699                         }
 700                 latitude = atof(lat_deg) + atof(lat_min) / 60;
 701                 if (!g_strcmp0(text_latitude_ref, "South"))
 702                         {
 703                         latitude = -latitude;
 704                         }
 705                 lon_deg = strtok(text_longitude, "deg'");
 706                 lon_min = strtok(nullptr, "deg'");
 707                 if (!lon_deg || !lon_min)
 708                         {
 709                         return FALSE;
 710                         }
 711                 longitude = atof(lon_deg) + atof(lon_min) / 60;
 712                 if (!g_strcmp0(text_longitude_ref, "West"))
 713                         {
 714                         longitude = -longitude;
 715                         }
 716
 717                 timezone_path = g_build_filename(get_rc_dir(), TIMEZONE_DATABASE_FILE, NULL);
 718                 if (g_file_test(timezone_path, G_FILE_TEST_EXISTS))
 719                         {
 720                         ZDSetErrorHandler(ZoneDetect_onError);
 721                         cd = ZDOpenDatabase(timezone_path);
 722                         if (cd)
 723                                 {
 724                                 results = ZDLookup(cd, latitude, longitude, nullptr);
 725                                 if (results)
 726                                         {
 727                                         zd_tz(results, timezone, countryname, countryalpha2);
 728                                         ret = TRUE;
 729                                         }
 730                                 }
 731                         else
 732                                 {
 733                                 log_printf("Error: Init of timezone database %s failed\n", timezone_path);
 734                                 }
 735                         ZDCloseDatabase(cd);
 736                         }
 737                 g_free(timezone_path);
 738                 }
 739
 740         if (ret && text_date && text_time)
 741                 {
 742                 *exif_date_time = g_strconcat(text_date, ":", text_time, NULL);
 743                 }
 744         else
 745                 {
 746                 ret = FALSE;
 747                 }
 748         return ret;
 749 }
 750
 751 /**
 752  * @brief Creates local time from GPS lat/long
 753  * @param[in] exif
 754  * @returns Localised time and date
 755  *
 756  * GPS lat/long is translated to timezone using ZoneDetect.
 757  * GPS UTC is converted to Unix time stamp (seconds since 1970).
 758  * The TZ environment variable is set to the relevant timezone
 759  * and the Unix timestamp converted to local time using locale.
 760  * If the conversion fails, unformatted UTC is returned.
 761  */
 762 static gchar *exif_build_formatted_localtime(ExifData *exif)
 763 {
 764         gchar buf[128];
 765         gchar *tmp;
 766         gint buflen;
 767         GError *error = nullptr;
 768         gchar *time_zone_image;
 769         gchar *time_zone_org;
 770         struct tm *tm_local;
 771         struct tm tm_utc;
 772         time_t stamp;
 773         gchar *exif_date_time = nullptr;
 774         gchar *timezone = nullptr;
 775         gchar *countryname = nullptr;
 776         gchar *countryalpha2 = nullptr;
 777
 778         if (exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2))
 779                 {
 780                 time_zone_image = g_strconcat("TZ=", timezone, NULL);
 781                 time_zone_org = g_strconcat("TZ=", getenv("TZ"), NULL);
 782                 setenv("TZ", "UTC", TRUE);
 783
 784                 memset(&tm_utc, 0, sizeof(tm_utc));
 785                 if (exif_date_time && strptime(exif_date_time, "%Y:%m:%d:%H:%M:%S", &tm_utc))
 786                         {
 787                         stamp = mktime(&tm_utc);        // Convert the struct to a Unix timestamp
 788                         putenv(time_zone_image);        // Switch to destination time zone
 789
 790                         tm_local = localtime(&stamp);
 791
 792                         /* Convert to localtime using locale */
 793                         buflen = strftime(buf, sizeof(buf), "%x %X", tm_local);
 794                         if (buflen > 0)
 795                                 {
 796                                 tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 797                                 if (error)
 798                                         {
 799                                         log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 800                                         g_error_free(error);
 801                                         }
 802                                 else
 803                                         {
 804                                         g_free(exif_date_time);
 805                                         exif_date_time = tmp;
 806                                         }
 807                                 }
 808                         }
 809                 putenv(time_zone_org);
 810
 811                 g_free(time_zone_image);
 812                 g_free(time_zone_org);
 813                 }
 814
 815         g_free(timezone);
 816         g_free(countryname);
 817         g_free(countryalpha2);
 818
 819         return exif_date_time;
 820 }
 821
 822 /**
 823  * @brief Gets timezone from GPS lat/long
 824  * @param[in] exif
 825  * @returns Timezone string in the form "Europe/London"
 826  *
 827  *
 828  */
 829 static gchar *exif_build_formatted_timezone(ExifData *exif)
 830 {
 831         gchar *exif_date_time = nullptr;
 832         gchar *timezone = nullptr;
 833         gchar *countryname = nullptr;
 834         gchar *countryalpha2 = nullptr;
 835
 836         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 837
 838         g_free(exif_date_time);
 839         g_free(countryname);
 840         g_free(countryalpha2);
 841
 842         return timezone;
 843 }
 844
 845 /**
 846  * @brief Gets countryname from GPS lat/long
 847  * @param[in] exif
 848  * @returns Countryname string
 849  *
 850  *
 851  */
 852 static gchar *exif_build_formatted_countryname(ExifData *exif)
 853 {
 854         gchar *exif_date_time = nullptr;
 855         gchar *timezone = nullptr;
 856         gchar *countryname = nullptr;
 857         gchar *countryalpha2 = nullptr;
 858
 859         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 860
 861         g_free(exif_date_time);
 862         g_free(timezone);
 863         g_free(countryalpha2);
 864
 865         return countryname;
 866 }
 867
 868 /**
 869  * @brief Gets two-letter country code from GPS lat/long
 870  * @param[in] exif
 871  * @returns Countryalpha2 string
 872  *
 873  *
 874  */
 875 static gchar *exif_build_formatted_countrycode(ExifData *exif)
 876 {
 877         gchar *exif_date_time = nullptr;
 878         gchar *timezone = nullptr;
 879         gchar *countryname = nullptr;
 880         gchar *countryalpha2 = nullptr;
 881
 882         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 883
 884         g_free(exif_date_time);
 885         g_free(timezone);
 886         g_free(countryname);
 887
 888         return countryalpha2;
 889 }
 890
 891 static gchar *exif_build_formatted_star_rating(ExifData *exif)
 892 {
 893         gint n = 0;
 894
 895         exif_get_integer(exif, "Xmp.xmp.Rating", &n);
 896
 897         return convert_rating_to_stars(n);
 898 }
 899
 900 /* List of custom formatted pseudo-exif tags */
 901 #define EXIF_FORMATTED_TAG(name, label) { EXIF_FORMATTED()#name, label, exif_build_formatted##_##name }
 902
 903 ExifFormattedText ExifFormattedList[] = {
 904         EXIF_FORMATTED_TAG(Camera,              N_("Camera")),
 905         EXIF_FORMATTED_TAG(DateTime,            N_("Date")),
 906         EXIF_FORMATTED_TAG(DateTimeDigitized,   N_("DateDigitized")),
 907         EXIF_FORMATTED_TAG(ShutterSpeed,        N_("Shutter speed")),
 908         EXIF_FORMATTED_TAG(Aperture,            N_("Aperture")),
 909         EXIF_FORMATTED_TAG(ExposureBias,        N_("Exposure bias")),
 910         EXIF_FORMATTED_TAG(ISOSpeedRating,      N_("ISO sensitivity")),
 911         EXIF_FORMATTED_TAG(FocalLength,         N_("Focal length")),
 912         EXIF_FORMATTED_TAG(FocalLength35mmFilm, N_("Focal length 35mm")),
 913         EXIF_FORMATTED_TAG(SubjectDistance,     N_("Subject distance")),
 914         EXIF_FORMATTED_TAG(Flash,               N_("Flash")),
 915         EXIF_FORMATTED_TAG(Resolution,          N_("Resolution")),
 916         EXIF_FORMATTED_TAG(ColorProfile,        N_("Color profile")),
 917         EXIF_FORMATTED_TAG(GPSPosition,         N_("GPS position")),
 918         EXIF_FORMATTED_TAG(GPSAltitude,         N_("GPS altitude")),
 919         EXIF_FORMATTED_TAG(localtime,           N_("Local time")),
 920         EXIF_FORMATTED_TAG(timezone,            N_("Time zone")),
 921         EXIF_FORMATTED_TAG(countryname,         N_("Country name")),
 922         EXIF_FORMATTED_TAG(countrycode,         N_("Country code")),
 923         EXIF_FORMATTED_TAG(star_rating,         N_("Star rating")),
 924         {"file.size",                           N_("File size"),        nullptr},
 925         {"file.date",                           N_("File date"),        nullptr},
 926         {"file.mode",                           N_("File mode"),        nullptr},
 927         {"file.ctime",                          N_("File ctime"),       nullptr},
 928         {"file.owner",                          N_("File owner"),       nullptr},
 929         {"file.group",                          N_("File group"),       nullptr},
 930         {"file.link",                           N_("File link"),        nullptr},
 931         {"file.class",                          N_("File class"),       nullptr},
 932         {"file.page_no",                        N_("Page no."),         nullptr},
 933         {"lua.lensID",                          N_("Lens"),             nullptr},
 934         { nullptr, nullptr, nullptr }
 935 };
 936
 937 gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gboolean *key_valid)
 938 {
 939         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0)
 940                 {
 941                 gint i;
 942
 943                 if (key_valid) *key_valid = TRUE;
 944
 945                 key += EXIF_FORMATTED_LEN;
 946                 for (i = 0; ExifFormattedList[i].key; i++)
 947                         if (ExifFormattedList[i].build_func && strcmp(key, ExifFormattedList[i].key + EXIF_FORMATTED_LEN) == 0)
 948                                 return ExifFormattedList[i].build_func(exif);
 949                 }
 950
 951         if (key_valid) *key_valid = FALSE;
 952         return nullptr;
 953 }
 954
 955 gchar *exif_get_description_by_key(const gchar *key)
 956 {
 957         if (!key) return nullptr;
 958
 959         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0 || strncmp(key, "file.", 5) == 0 || strncmp(key, "lua.", 4) == 0)
 960                 {
 961                 gint i;
 962
 963                 for (i = 0; ExifFormattedList[i].key; i++)
 964                         if (strcmp(key, ExifFormattedList[i].key) == 0)
 965                                 return g_strdup(_(ExifFormattedList[i].description));
 966                 }
 967
 968         return exif_get_tag_description_by_key(key);
 969 }
 970
 971 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
 972 {
 973         ExifItem *item;
 974
 975         item = exif_get_item(exif, key);
 976         return exif_item_get_integer(item, value);
 977 }
 978
 979 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
 980 {
 981         ExifItem *item;
 982
 983         item = exif_get_item(exif, key);
 984         return exif_item_get_rational(item, sign, 0);
 985 }
 986
 987 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
 988 {
 989         ExifItem *item;
 990         gchar *text;
 991         gboolean key_valid;
 992
 993         if (!key) return nullptr;
 994
 995         text = exif_get_formatted_by_key(exif, key, &key_valid);
 996         if (key_valid) return text;
 997
 998         item = exif_get_item(exif, key);
 999         if (item) return exif_item_get_data_as_text(item, exif);
1000
1001         return nullptr;
1002 }
1003
1004
1005 static FileCacheData *exif_cache;
1006
1007 void exif_release_cb(FileData *fd)
1008 {
1009         exif_free(fd->exif);
1010         fd->exif = nullptr;
1011 }
1012
1013 void exif_init_cache()
1014 {
1015         g_assert(!exif_cache);
1016         exif_cache = file_cache_new(exif_release_cb, 4);
1017 }
1018
1019 ExifData *exif_read_fd(FileData *fd)
1020 {
1021         gchar *sidecar_path;
1022
1023         if (!exif_cache) exif_init_cache();
1024
1025         if (!fd) return nullptr;
1026
1027         if (file_cache_get(exif_cache, fd)) return fd->exif;
1028         g_assert(fd->exif == nullptr);
1029
1030         /* CACHE_TYPE_XMP_METADATA file should exist only if the metadata are
1031          * not writable directly, thus it should contain the most up-to-date version */
1032         sidecar_path = nullptr;
1033
1034 #ifdef HAVE_EXIV2
1035         /* we are not able to handle XMP sidecars without exiv2 */
1036         sidecar_path = cache_find_location(CACHE_TYPE_XMP_METADATA, fd->path);
1037
1038         if (!sidecar_path) sidecar_path = file_data_get_sidecar_path(fd, TRUE);
1039 #endif
1040
1041         fd->exif = exif_read(fd->path, sidecar_path, fd->modified_xmp);
1042
1043         g_free(sidecar_path);
1044         file_cache_put(exif_cache, fd, 1);
1045         return fd->exif;
1046 }
1047
1048
1049 void exif_free_fd(FileData *fd, ExifData *exif)
1050 {
1051         if (!fd) return;
1052         g_assert(fd->exif == exif);
1053 }
1054
1055 /* embedded icc in jpeg */
1056
1057 gboolean exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
1058 {
1059         guint seg_offset = 0;
1060         guint seg_length = 0;
1061         guint chunk_offset[255];
1062         guint chunk_length[255];
1063         guint chunk_count = 0;
1064
1065         /* For jpeg/jfif, ICC color profile data can be in more than one segment.
1066            the data is in APP2 data segments that start with "ICC_PROFILE\x00\xNN\xTT"
1067            NN = segment number for data
1068            TT = total number of ICC segments (TT in each ICC segment should match)
1069          */
1070
1071         while (jpeg_segment_find(data + seg_offset + seg_length,
1072                                       size - seg_offset - seg_length,
1073                                       JPEG_MARKER_APP2,
1074                                       "ICC_PROFILE\x00", 12,
1075                                       &seg_offset, &seg_length))
1076                 {
1077                 guchar chunk_num;
1078                 guchar chunk_tot;
1079
1080                 if (seg_length < 14) return FALSE;
1081
1082                 chunk_num = data[seg_offset + 12];
1083                 chunk_tot = data[seg_offset + 13];
1084
1085                 if (chunk_num == 0 || chunk_tot == 0) return FALSE;
1086
1087                 if (chunk_count == 0)
1088                         {
1089                         guint i;
1090
1091                         chunk_count = static_cast<guint>(chunk_tot);
1092                         for (i = 0; i < chunk_count; i++) chunk_offset[i] = 0;
1093                         for (i = 0; i < chunk_count; i++) chunk_length[i] = 0;
1094                         }
1095
1096                 if (chunk_tot != chunk_count ||
1097                     chunk_num > chunk_count) return FALSE;
1098
1099                 chunk_num--;
1100                 chunk_offset[chunk_num] = seg_offset + 14;
1101                 chunk_length[chunk_num] = seg_length - 14;
1102                 }
1103
1104         if (chunk_count > 0)
1105                 {
1106                 guchar *cp_data;
1107                 guint cp_length = 0;
1108                 guint i;
1109
1110                 for (i = 0; i < chunk_count; i++) cp_length += chunk_length[i];
1111                 cp_data = static_cast<guchar *>(g_malloc(cp_length));
1112
1113                 for (i = 0; i < chunk_count; i++)
1114                         {
1115                         if (chunk_offset[i] == 0)
1116                                 {
1117                                 /* error, we never saw this chunk */
1118                                 g_free(cp_data);
1119                                 return FALSE;
1120                                 }
1121                         memcpy(cp_data, data + chunk_offset[i], chunk_length[i]);
1122                         }
1123                 DEBUG_1("Found embedded icc profile in jpeg");
1124                 exif_add_jpeg_color_profile(exif, cp_data, cp_length);
1125
1126                 return TRUE;
1127                 }
1128
1129         return FALSE;
1130 }
1131
1132 /*
1133  *-------------------------------------------------------------------
1134  * file info
1135  * it is here because it shares tag neming infrastructure with exif
1136  * we should probably not invest too much effort into this because
1137  * new exiv2 will support the same functionality
1138  * https://dev.exiv2.org/issues/505
1139  *-------------------------------------------------------------------
1140  */
1141
1142 static gchar *mode_number(mode_t m)
1143 {
1144         gint mb, mu, mg, mo;
1145         gchar pbuf[12];
1146
1147         mb = mu = mg = mo = 0;
1148
1149         if (m & S_ISUID) mb |= 4;
1150         if (m & S_ISGID) mb |= 2;
1151         if (m & S_ISVTX) mb |= 1;
1152
1153         if (m & S_IRUSR) mu |= 4;
1154         if (m & S_IWUSR) mu |= 2;
1155         if (m & S_IXUSR) mu |= 1;
1156
1157         if (m & S_IRGRP) mg |= 4;
1158         if (m & S_IWGRP) mg |= 2;
1159         if (m & S_IXGRP) mg |= 1;
1160
1161         if (m & S_IROTH) mo |= 4;
1162         if (m & S_IWOTH) mo |= 2;
1163         if (m & S_IXOTH) mo |= 1;
1164
1165         pbuf[0] = (m & S_IRUSR) ? 'r' : '-';
1166         pbuf[1] = (m & S_IWUSR) ? 'w' : '-';
1167         pbuf[2] = (m & S_IXUSR) ? 'x' : '-';
1168         pbuf[3] = (m & S_IRGRP) ? 'r' : '-';
1169         pbuf[4] = (m & S_IWGRP) ? 'w' : '-';
1170         pbuf[5] = (m & S_IXGRP) ? 'x' : '-';
1171         pbuf[6] = (m & S_IROTH) ? 'r' : '-';
1172         pbuf[7] = (m & S_IWOTH) ? 'w' : '-';
1173         pbuf[8] = (m & S_IXOTH) ? 'x' : '-';
1174         pbuf[9] = '\0';
1175
1176         return g_strdup_printf("%s (%d%d%d%d)", pbuf, mb, mu, mg, mo);
1177 }
1178
1179 gchar *metadata_file_info(FileData *fd, const gchar *key, MetadataFormat UNUSED(format))
1180 {
1181         gchar *page_n_of_m;
1182
1183         if (strcmp(key, "file.size") == 0)
1184                 {
1185                 return g_strdup_printf("%ld", static_cast<long>(fd->size));
1186                 }
1187         if (strcmp(key, "file.date") == 0)
1188                 {
1189                 return g_strdup(text_from_time(fd->date));
1190                 }
1191         if (strcmp(key, "file.mode") == 0)
1192                 {
1193                 return mode_number(fd->mode);
1194                 }
1195         if (strcmp(key, "file.ctime") == 0)
1196                 {
1197                 return g_strdup(text_from_time(fd->cdate));
1198                 }
1199         if (strcmp(key, "file.class") == 0)
1200                 {
1201                 return g_strdup(format_class_list[fd->format_class]);
1202                 }
1203         if (strcmp(key, "file.owner") == 0)
1204                 {
1205                 return g_strdup(fd->owner);
1206                 }
1207         if (strcmp(key, "file.group") == 0)
1208                 {
1209                 return g_strdup(fd->group);
1210                 }
1211         if (strcmp(key, "file.link") == 0)
1212                 {
1213                 return g_strdup(fd->sym_link);
1214                 }
1215         if (strcmp(key, "file.page_no") == 0)
1216                 {
1217                 if (fd->page_total > 1)
1218                         {
1219                         page_n_of_m = g_strdup_printf("[%d/%d]", fd->page_num + 1, fd->page_total);
1220                         return page_n_of_m;
1221                         }
1222                 else
1223                         {
1224                         return nullptr;
1225                         }
1226                 }
1227         return g_strdup("");
1228 }
1229
1230 #ifdef HAVE_LUA
1231 gchar *metadata_lua_info(FileData *fd, const gchar *key, MetadataFormat UNUSED(format))
1232 {
1233         gchar *script_name;
1234         gchar *script_name_utf8;
1235         gchar *data;
1236         gchar *raw_data;
1237         gchar *valid_data;
1238
1239         script_name_utf8 = g_strdup(key + 4);
1240         script_name = path_from_utf8(script_name_utf8);
1241
1242         raw_data = lua_callvalue(fd, script_name, nullptr);
1243         valid_data = g_utf8_make_valid(raw_data, -1);
1244         data = g_utf8_substring(valid_data, 0, 150);
1245
1246         g_free(script_name);
1247         g_free(script_name_utf8);
1248         g_free(raw_data);
1249         g_free(valid_data);
1250
1251         return data;
1252 }
1253 #endif
1254 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */