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 #ifdef __linux__
  23 #define _XOPEN_SOURCE
  24 #endif
  25
  26 #include <sys/stat.h>
  27
  28 #include <cmath>
  29 #include <cstdlib>
  30 #include <cstring>
  31 #include <ctime>
  32
  33 #include <glib.h>
  34
  35 #if HAVE_LCMS
  36 /*** color support enabled ***/
  37 #  if HAVE_LCMS2
  38 #    include <lcms2.h>
  39 #  else
  40 #    include <lcms.h>
  41 #  endif
  42 #endif
  43
  44 #include "cache.h"
  45 #include "debug.h"
  46 #include "exif.h"
  47 #include "filecache.h"
  48 #include "filedata.h"
  49 #include "glua.h"
  50 #include "intl.h"
  51 #include "jpeg-parser.h"
  52 #include "main-defines.h"
  53 #include "misc.h"
  54 #include "typedefs.h"
  55 #include "ui-fileops.h"
  56 #include "zonedetect.h"
  57
  58 struct ExifData;
  59 struct ExifItem;
  60 struct FileCacheData;
  61 struct ZoneDetect;
  62
  63
  64 static gdouble exif_rational_to_double(ExifRational *r, gint sign)
  65 {
  66         if (!r || r->den == 0.0) return 0.0;
  67
  68         if (sign) return static_cast<gdouble>(static_cast<gint>(r->num)) / static_cast<gdouble>(static_cast<gint>(r->den));
  69         return static_cast<gdouble>(r->num) / r->den;
  70 }
  71
  72 static gdouble exif_get_rational_as_double(ExifData *exif, const gchar *key)
  73 {
  74         ExifRational *r;
  75         gint sign;
  76
  77         r = exif_get_rational(exif, key, &sign);
  78         return exif_rational_to_double(r, sign);
  79 }
  80
  81 static GString *append_comma_text(GString *string, const gchar *text)
  82 {
  83         string = g_string_append(string, ", ");
  84         string = g_string_append(string, text);
  85
  86         return string;
  87 }
  88
  89 static gchar *remove_common_prefix(gchar *s, gchar *t)
  90 {
  91         gint i;
  92
  93         if (!s || !t) return t;
  94
  95         for (i = 0; s[i] && t[i] && s[i] == t[i]; i++)
  96                 ;
  97         if (!i)
  98                 return t;
  99         if (s[i-1] == ' ' || !s[i])
 100                 {
 101                 while (t[i] == ' ')
 102                         i++;
 103                 return t + i;
 104                 }
 105         return s;
 106 }
 107
 108 static gdouble get_crop_factor(ExifData *exif)
 109 {
 110         gdouble res_unit_tbl[] = {0.0, 25.4, 25.4, 10.0, 1.0, 0.001 };
 111         gdouble xres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneXResolution");
 112         gdouble yres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneYResolution");
 113         gint res_unit;
 114         gint w;
 115         gint h;
 116         gdouble xsize;
 117         gdouble ysize;
 118         gdouble size;
 119         gdouble ratio;
 120
 121         if (xres == 0.0 || yres == 0.0) return 0.0;
 122
 123         if (!exif_get_integer(exif, "Exif.Photo.FocalPlaneResolutionUnit", &res_unit)) return 0.0;
 124         if (res_unit < 1 || res_unit > 5) return 0.0;
 125
 126         if (!exif_get_integer(exif, "Exif.Photo.PixelXDimension", &w)) return 0.0;
 127         if (!exif_get_integer(exif, "Exif.Photo.PixelYDimension", &h)) return 0.0;
 128
 129         xsize = w * res_unit_tbl[res_unit] / xres;
 130         ysize = h * res_unit_tbl[res_unit] / yres;
 131
 132         ratio = xsize / ysize;
 133
 134         if (ratio < 0.5 || ratio > 2.0) return 0.0; /* reasonable ratio */
 135
 136         size = hypot(xsize, ysize);
 137
 138         if (size < 1.0 || size > 100.0) return 0.0; /* reasonable sensor size in mm */
 139
 140         return hypot(36, 24) / size;
 141 }
 142
 143 static gboolean remove_suffix(gchar *str, const gchar *suffix, gint suffix_len)
 144 {
 145         gint str_len = strlen(str);
 146
 147         if (suffix_len < 0) suffix_len = strlen(suffix);
 148         if (str_len < suffix_len) return FALSE;
 149
 150         if (strcmp(str + str_len - suffix_len, suffix) != 0) return FALSE;
 151         str[str_len - suffix_len] = '\0';
 152
 153         return TRUE;
 154 }
 155
 156 static gchar *exif_build_formatted_Camera(ExifData *exif)
 157 {
 158         gchar *text;
 159         gchar *make = exif_get_data_as_text(exif, "Exif.Image.Make");
 160         gchar *model = exif_get_data_as_text(exif, "Exif.Image.Model");
 161         gchar *software = exif_get_data_as_text(exif, "Exif.Image.Software");
 162         gchar *model2;
 163         gchar *software2;
 164
 165         if (make)
 166                 {
 167                 g_strstrip(make);
 168
 169                 if (remove_suffix(make, " CORPORATION", 12)) { /* Nikon */ }
 170                 else if (remove_suffix(make, " Corporation", 12)) { /* Pentax */ }
 171                 else if (remove_suffix(make, " OPTICAL CO.,LTD", 16)) { /* OLYMPUS */ };
 172                 }
 173
 174         if (model)
 175                 g_strstrip(model);
 176
 177         if (software)
 178                 {
 179                 gint i;
 180                 gint j;
 181
 182                 g_strstrip(software);
 183
 184                 /* remove superfluous spaces (pentax K100D) */
 185                 for (i = 0, j = 0; software[i]; i++, j++)
 186                         {
 187                         if (software[i] == ' ' && software[i + 1] == ' ')
 188                                 i++;
 189                         if (i != j) software[j] = software[i];
 190                         }
 191                 software[j] = '\0';
 192                 }
 193
 194         model2 = remove_common_prefix(make, model);
 195         software2 = remove_common_prefix(model2, software);
 196
 197         text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", (make && model2) ? " " : "",
 198                                                (model2) ? model2 : "",
 199                                                (software2 && (make || model2)) ? " (" : "",
 200                                                (software2) ? software2 : "",
 201                                                (software2 && (make || model2)) ? ")" : "");
 202
 203         g_free(make);
 204         g_free(model);
 205         g_free(software);
 206         return text;
 207 }
 208
 209 static gchar *exif_build_formatted_DateTime(ExifData *exif)
 210 {
 211         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeOriginal");
 212         gchar *subsec = nullptr;
 213         gchar buf[128];
 214         gchar *tmp;
 215         gint buflen;
 216         struct tm tm;
 217         GError *error = nullptr;
 218
 219         if (text)
 220                 {
 221                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeOriginal");
 222                 }
 223         else
 224                 {
 225                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 226                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 227                 }
 228
 229         /* Convert the stuff into a tm struct */
 230         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 231         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 232                 {
 233                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 234                 if (buflen > 0)
 235                         {
 236                         tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 237                         if (error)
 238                                 {
 239                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 240                                 g_error_free(error);
 241                                 }
 242                         else
 243                                 {
 244                                 g_free(text);
 245                                 text = g_strdup(tmp);
 246                                 }
 247                         }
 248                 }
 249
 250         if (subsec)
 251                 {
 252                 tmp = text;
 253                 text = g_strconcat(tmp, ".", subsec, NULL);
 254                 g_free(tmp);
 255                 g_free(subsec);
 256                 }
 257         return text;
 258 }
 259
 260 static gchar *exif_build_formatted_DateTimeDigitized(ExifData *exif)
 261 {
 262         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeDigitized");
 263         gchar *subsec = nullptr;
 264         gchar buf[128];
 265         gchar *tmp;
 266         gint buflen;
 267         struct tm tm;
 268         GError *error = nullptr;
 269
 270         if (text)
 271                 {
 272                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeDigitized");
 273                 }
 274         else
 275                 {
 276                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 277                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 278                 }
 279
 280         /* Convert the stuff into a tm struct */
 281         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 282         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 283                 {
 284                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 285                 if (buflen > 0)
 286                         {
 287                         tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 288                         if (error)
 289                                 {
 290                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 291                                 g_error_free(error);
 292                                 }
 293                         else
 294                                 {
 295                                 g_free(text);
 296                                 text = g_strdup(tmp);
 297                                 }
 298                         }
 299                 }
 300
 301         if (subsec)
 302                 {
 303                 tmp = text;
 304                 text = g_strconcat(tmp, ".", subsec, NULL);
 305                 g_free(tmp);
 306                 g_free(subsec);
 307                 }
 308         return text;
 309 }
 310
 311 static gchar *exif_build_formatted_ShutterSpeed(ExifData *exif)
 312 {
 313         ExifRational *r;
 314
 315         r = exif_get_rational(exif, "Exif.Photo.ExposureTime", nullptr);
 316         if (r && r->num && r->den)
 317                 {
 318                 gdouble n = static_cast<gdouble>(r->den) / static_cast<gdouble>(r->num);
 319                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 320                                                   n > 1.0 ? n : 1.0 / n);
 321                 }
 322         r = exif_get_rational(exif, "Exif.Photo.ShutterSpeedValue", nullptr);
 323         if (r && r->num  && r->den)
 324                 {
 325                 gdouble n = pow(2.0, exif_rational_to_double(r, TRUE));
 326
 327                 /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
 328                 if (n > 1.0 && static_cast<gint>(n) - (static_cast<gint>(n/10))*10 == 1) n--;
 329
 330                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 331                                                   n > 1.0 ? floor(n) : 1.0 / n);
 332                 }
 333         return nullptr;
 334 }
 335
 336 static gchar *exif_build_formatted_Aperture(ExifData *exif)
 337 {
 338         gdouble n;
 339
 340         n = exif_get_rational_as_double(exif, "Exif.Photo.FNumber");
 341         if (n == 0.0) n = exif_get_rational_as_double(exif, "Exif.Photo.ApertureValue");
 342         if (n == 0.0) return nullptr;
 343
 344         return g_strdup_printf("f/%.1f", n);
 345 }
 346
 347 static gchar *exif_build_formatted_ExposureBias(ExifData *exif)
 348 {
 349         ExifRational *r;
 350         gint sign;
 351         gdouble n;
 352
 353         r = exif_get_rational(exif, "Exif.Photo.ExposureBiasValue", &sign);
 354         if (!r) return nullptr;
 355
 356         n = exif_rational_to_double(r, sign);
 357         return g_strdup_printf("%+.1f", n);
 358 }
 359
 360 static gchar *exif_build_formatted_FocalLength(ExifData *exif)
 361 {
 362         gdouble n;
 363
 364         n = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 365         if (n == 0.0) return nullptr;
 366         return g_strdup_printf("%.0f mm", n);
 367 }
 368
 369 static gchar *exif_build_formatted_FocalLength35mmFilm(ExifData *exif)
 370 {
 371         gint n;
 372         gdouble f;
 373         gdouble c;
 374
 375         if (exif_get_integer(exif, "Exif.Photo.FocalLengthIn35mmFilm", &n) && n != 0)
 376                 {
 377                 return g_strdup_printf("%d mm", n);
 378                 }
 379
 380         f = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 381         if (f == 0.0) return nullptr;
 382
 383         c = get_crop_factor(exif);
 384         if (c == 0.0) return nullptr;
 385
 386         return g_strdup_printf("%.0f mm", f * c);
 387 }
 388
 389 static gchar *exif_build_formatted_ISOSpeedRating(ExifData *exif)
 390 {
 391         gchar *text;
 392
 393         text = exif_get_data_as_text(exif, "Exif.Photo.ISOSpeedRatings");
 394         /* old canon may set this instead */
 395         if (!text) text = exif_get_data_as_text(exif, "Exif.CanonSi.ISOSpeed");
 396         /* kodak may set this instead */
 397         if (!text) text = exif_get_data_as_text(exif, "Exif.Photo.ExposureIndex");
 398         return text;
 399 }
 400
 401 static gchar *exif_build_formatted_SubjectDistance(ExifData *exif)
 402 {
 403         ExifRational *r;
 404         gint sign;
 405         gdouble n;
 406
 407         r = exif_get_rational(exif, "Exif.Photo.SubjectDistance", &sign);
 408         if (!r) return nullptr;
 409
 410         if (static_cast<glong>(r->num) == static_cast<glong>(0xffffffff)) return g_strdup(_("infinity"));
 411         if (static_cast<glong>(r->num) == 0) return g_strdup(_("unknown"));
 412
 413         n = exif_rational_to_double(r, sign);
 414         if (n == 0.0) return _("unknown");
 415         return g_strdup_printf("%.3f m", n);
 416 }
 417
 418 static gchar *exif_build_formatted_Flash(ExifData *exif)
 419 {
 420         /* grr, flash is a bitmask... */
 421         GString *string;
 422         gint n;
 423         gint v;
 424
 425         if (!exif_get_integer(exif, "Exif.Photo.Flash", &n)) return nullptr;
 426
 427         /* Exif 2.1 only defines first 3 bits */
 428         if (n <= 0x07) return exif_get_data_as_text(exif, "Exif.Photo.Flash");
 429
 430         /* must be Exif 2.2 */
 431         string = g_string_new("");
 432
 433         /* flash fired (bit 0) */
 434         string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
 435
 436         /* flash mode (bits 3, 4) */
 437         v = (n >> 3) & 0x03;
 438         if (v) string = append_comma_text(string, _("mode:"));
 439         switch (v)
 440                 {
 441                 case 1:
 442                         string = g_string_append(string, _("on"));
 443                         break;
 444                 case 2:
 445                         string = g_string_append(string, _("off"));
 446                         break;
 447                 case 3:
 448                         string = g_string_append(string, _("auto"));
 449                         break;
 450                 }
 451
 452         /* return light (bits 1, 2) */
 453         v = (n >> 1) & 0x03;
 454         if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
 455         if (v == 3) string = append_comma_text(string, _("detected by strobe"));
 456
 457         /* we ignore flash function (bit 5) */
 458
 459         /* red-eye (bit 6) */
 460         if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
 461
 462         return g_string_free(string, FALSE);
 463 }
 464
 465 static gchar *exif_build_formatted_Resolution(ExifData *exif)
 466 {
 467         ExifRational *rx;
 468         ExifRational *ry;
 469         gchar *units;
 470         gchar *text;
 471
 472         rx = exif_get_rational(exif, "Exif.Image.XResolution", nullptr);
 473         ry = exif_get_rational(exif, "Exif.Image.YResolution", nullptr);
 474         if (!rx || !ry) return nullptr;
 475
 476         units = exif_get_data_as_text(exif, "Exif.Image.ResolutionUnit");
 477         text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? static_cast<gdouble>(rx->num) / rx->den : 1.0,
 478                                                       ry->den ? static_cast<gdouble>(ry->num) / ry->den : 1.0,
 479                                                       _("dot"), (units) ? units : _("unknown"));
 480
 481         g_free(units);
 482         return text;
 483 }
 484
 485 static gchar *exif_build_formatted_ColorProfile(ExifData *exif)
 486 {
 487 #if HAVE_LCMS2
 488         cmsUInt8Number profileID[17];
 489 #endif
 490         const gchar *name = "";
 491         const gchar *source = "";
 492         guchar *profile_data;
 493         guint profile_len;
 494
 495         profile_data = exif_get_color_profile(exif, &profile_len);
 496         if (!profile_data)
 497                 {
 498                 gint cs;
 499                 gchar *interop_index;
 500
 501                 /* ColorSpace == 1 specifies sRGB per EXIF 2.2 */
 502                 if (!exif_get_integer(exif, "Exif.Photo.ColorSpace", &cs)) cs = 0;
 503                 interop_index = exif_get_data_as_text(exif, "Exif.Iop.InteroperabilityIndex");
 504
 505                 if (cs == 1)
 506                         {
 507                         name = _("sRGB");
 508                         source = "ColorSpace";
 509                         }
 510                 else if (cs == 2 || (interop_index && !strcmp(interop_index, "R03")))
 511                         {
 512                         name = _("AdobeRGB");
 513                         source = (cs == 2) ? "ColorSpace" : "Iop";
 514                         }
 515
 516                 g_free(interop_index);
 517                 }
 518         else
 519                 {
 520                 source = _("embedded");
 521 #if HAVE_LCMS
 522
 523                         {
 524                         cmsHPROFILE profile;
 525
 526                         profile = cmsOpenProfileFromMem(profile_data, profile_len);
 527                         if (profile)
 528                                 {
 529 #if HAVE_LCMS2
 530                                 profileID[16] = '\0';
 531                                 cmsGetHeaderProfileID(profile, profileID);
 532                                 name = reinterpret_cast<gchar *>(profileID);
 533 #else
 534                                 name = (gchar *) cmsTakeProductName(profile);
 535 #endif
 536                                 cmsCloseProfile(profile);
 537                                 }
 538                         g_free(profile_data);
 539                         }
 540 #endif
 541                 }
 542         if (name[0] == 0 && source[0] == 0) return nullptr;
 543         return g_strdup_printf("%s (%s)", name, source);
 544 }
 545
 546 static gchar *exif_build_formatted_GPSPosition(ExifData *exif)
 547 {
 548         GString *string;
 549         gchar *ref;
 550         ExifRational *value;
 551         ExifItem *item;
 552         guint i;
 553         gdouble p;
 554         gdouble p3;
 555         gulong p1;
 556         gulong p2;
 557
 558         string = g_string_new("");
 559
 560         item = exif_get_item(exif, "Exif.GPSInfo.GPSLatitude");
 561         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 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         item = exif_get_item(exif, "Exif.GPSInfo.GPSLongitude");
 579         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 580         if (item && ref)
 581                 {
 582                 p = 0;
 583                 for (i = 0; i < exif_item_get_elements(item); i++)
 584                         {
 585                         value = exif_item_get_rational(item, nullptr, i);
 586                         if (value && value->num && value->den)
 587                         p += static_cast<gdouble>(value->num) / static_cast<gdouble>(value->den) / pow(60.0, static_cast<gdouble>(i));
 588                         }
 589                 p1 = static_cast<gint>(p);
 590                 p2 = static_cast<gint>((p - p1)*60);
 591                 p3 = ((p - p1)*60 - p2)*60;
 592
 593                 g_string_append_printf(string, ", %0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 594                 } // if (item && ref)
 595
 596         return g_string_free(string, FALSE);
 597 } // static gchar *exif_build_forma...
 598
 599 static gchar *exif_build_formatted_GPSAltitude(ExifData *exif)
 600 {
 601         ExifRational *r;
 602         ExifItem *item;
 603         gdouble alt;
 604         gint ref;
 605
 606         item = exif_get_item(exif, "Exif.GPSInfo.GPSAltitudeRef");
 607         r = exif_get_rational(exif, "Exif.GPSInfo.GPSAltitude", nullptr);
 608
 609         if (!r || !item) return nullptr;
 610
 611         alt = exif_rational_to_double(r, 0);
 612         exif_item_get_integer(item, &ref);
 613
 614         return g_strdup_printf("%0.f m %s", alt, (ref==0)?_("Above Sea Level"):_("Below Sea Level"));
 615 }
 616
 617 /**
 618  * @brief Extracts timezone data from a ZoneDetect search structure
 619  * @param[in] results ZoneDetect search structure
 620  * @param[out] timezone in the form "Europe/London"
 621  * @param[out] countryname in the form "United Kingdom"
 622  * @param[out] countryalpha2 in the form "GB"
 623  *
 624  * Refer to https://github.com/BertoldVdb/ZoneDetect
 625  * for structure details
 626  */
 627 static void zd_tz(ZoneDetectResult *results, gchar **timezone, gchar **countryname, gchar **countryalpha2)
 628 {
 629         gchar *timezone_pre = nullptr;
 630         gchar *timezone_id = nullptr;
 631         unsigned int index = 0;
 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                                 if (g_strstr_len(results[index].fieldNames[i], -1, "CountryName"))
 648                                         {
 649                                         *countryname = g_strdup(results[index].data[i]);
 650                                         }
 651                                 if (g_strstr_len(results[index].fieldNames[i], -1, "CountryAlpha2"))
 652                                         {
 653                                         *countryalpha2 = g_strdup(results[index].data[i]);
 654                                         }
 655                                 }
 656                         }
 657                 index++;
 658                 }
 659
 660         *timezone = g_strconcat(timezone_pre, timezone_id, NULL);
 661         g_free(timezone_pre);
 662         g_free(timezone_id);
 663 }
 664
 665 void ZoneDetect_onError(int errZD, int errNative)
 666 {
 667         log_printf("Error: ZoneDetect %s (0x%08X)\n", ZDGetErrorString(errZD), (unsigned)errNative);
 668 }
 669
 670 /**
 671  * @brief Gets timezone data from an exif structure
 672  * @param[in] exif
 673  * @returns TRUE if timezone data found AND GPS date and time found
 674  * @param[out] exif_date_time exif date/time in the form 2018:11:30:17:05:04
 675  * @param[out] timezone in the form "Europe/London"
 676  * @param[out] countryname in the form "United Kingdom"
 677  * @param[out] countryalpha2 in the form "GB"
 678  *
 679  *
 680  */
 681 static gboolean exif_build_tz_data(ExifData *exif, gchar **exif_date_time, gchar **timezone, gchar **countryname, gchar **countryalpha2)
 682 {
 683         gfloat latitude;
 684         gfloat longitude;
 685         gchar *text_latitude;
 686         gchar *text_longitude;
 687         gchar *text_latitude_ref;
 688         gchar *text_longitude_ref;
 689         gchar *text_date;
 690         gchar *text_time;
 691         gchar *lat_deg;
 692         gchar *lat_min;
 693         gchar *lon_deg;
 694         gchar *lon_min;
 695         gchar *timezone_path;
 696         ZoneDetect *cd;
 697         ZoneDetectResult *results;
 698         gboolean ret = FALSE;
 699
 700         text_latitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitude");
 701         text_longitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitude");
 702         text_latitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 703         text_longitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 704         text_date = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSDateStamp");
 705         text_time = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSTimeStamp");
 706
 707         if (text_latitude && text_longitude && text_latitude_ref && text_longitude_ref)
 708                 {
 709                 lat_deg = strtok(text_latitude, "deg'");
 710                 lat_min = strtok(nullptr, "deg'");
 711                 if (!lat_deg || !lat_min)
 712                         {
 713                         return FALSE;
 714                         }
 715                 latitude = atof(lat_deg) + atof(lat_min) / 60;
 716                 if (!g_strcmp0(text_latitude_ref, "South"))
 717                         {
 718                         latitude = -latitude;
 719                         }
 720                 lon_deg = strtok(text_longitude, "deg'");
 721                 lon_min = strtok(nullptr, "deg'");
 722                 if (!lon_deg || !lon_min)
 723                         {
 724                         return FALSE;
 725                         }
 726                 longitude = atof(lon_deg) + atof(lon_min) / 60;
 727                 if (!g_strcmp0(text_longitude_ref, "West"))
 728                         {
 729                         longitude = -longitude;
 730                         }
 731
 732                 timezone_path = g_build_filename(get_rc_dir(), TIMEZONE_DATABASE_FILE, NULL);
 733                 if (g_file_test(timezone_path, G_FILE_TEST_EXISTS))
 734                         {
 735                         ZDSetErrorHandler(ZoneDetect_onError);
 736                         cd = ZDOpenDatabase(timezone_path);
 737                         if (cd)
 738                                 {
 739                                 results = ZDLookup(cd, latitude, longitude, nullptr);
 740                                 if (results)
 741                                         {
 742                                         zd_tz(results, timezone, countryname, countryalpha2);
 743                                         ret = TRUE;
 744                                         }
 745                                 }
 746                         else
 747                                 {
 748                                 log_printf("Error: Init of timezone database %s failed\n", timezone_path);
 749                                 }
 750                         ZDCloseDatabase(cd);
 751                         }
 752                 g_free(timezone_path);
 753                 }
 754
 755         if (ret && text_date && text_time)
 756                 {
 757                 *exif_date_time = g_strconcat(text_date, ":", text_time, NULL);
 758                 }
 759         else
 760                 {
 761                 ret = FALSE;
 762                 }
 763         return ret;
 764 }
 765
 766 /**
 767  * @brief Creates local time from GPS lat/long
 768  * @param[in] exif
 769  * @returns Localised time and date
 770  *
 771  * GPS lat/long is translated to timezone using ZoneDetect.
 772  * GPS UTC is converted to Unix time stamp (seconds since 1970).
 773  * The TZ environment variable is set to the relevant timezone
 774  * and the Unix timestamp converted to local time using locale.
 775  * If the conversion fails, unformatted UTC is returned.
 776  */
 777 static gchar *exif_build_formatted_localtime(ExifData *exif)
 778 {
 779         gchar buf[128];
 780         gchar *tmp;
 781         gint buflen;
 782         GError *error = nullptr;
 783         gchar *time_zone_image;
 784         gchar *time_zone_org;
 785         struct tm *tm_local;
 786         struct tm tm_utc;
 787         time_t stamp;
 788         gchar *exif_date_time = nullptr;
 789         gchar *timezone = nullptr;
 790         gchar *countryname = nullptr;
 791         gchar *countryalpha2 = nullptr;
 792
 793         if (exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2))
 794                 {
 795                 time_zone_image = g_strconcat("TZ=", timezone, NULL);
 796                 time_zone_org = g_strconcat("TZ=", getenv("TZ"), NULL);
 797                 setenv("TZ", "UTC", TRUE);
 798
 799                 memset(&tm_utc, 0, sizeof(tm_utc));
 800                 if (exif_date_time && strptime(exif_date_time, "%Y:%m:%d:%H:%M:%S", &tm_utc))
 801                         {
 802                         stamp = mktime(&tm_utc);        // Convert the struct to a Unix timestamp
 803                         putenv(time_zone_image);        // Switch to destination time zone
 804
 805                         tm_local = localtime(&stamp);
 806
 807                         /* Convert to localtime using locale */
 808                         buflen = strftime(buf, sizeof(buf), "%x %X", tm_local);
 809                         if (buflen > 0)
 810                                 {
 811                                 tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 812                                 if (error)
 813                                         {
 814                                         log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 815                                         g_error_free(error);
 816                                         }
 817                                 else
 818                                         {
 819                                         g_free(exif_date_time);
 820                                         exif_date_time = tmp;
 821                                         }
 822                                 }
 823                         }
 824                 putenv(time_zone_org);
 825
 826                 g_free(time_zone_image);
 827                 g_free(time_zone_org);
 828                 }
 829
 830         g_free(timezone);
 831         g_free(countryname);
 832         g_free(countryalpha2);
 833
 834         return exif_date_time;
 835 }
 836
 837 /**
 838  * @brief Gets timezone from GPS lat/long
 839  * @param[in] exif
 840  * @returns Timezone string in the form "Europe/London"
 841  *
 842  *
 843  */
 844 static gchar *exif_build_formatted_timezone(ExifData *exif)
 845 {
 846         gchar *exif_date_time = nullptr;
 847         gchar *timezone = nullptr;
 848         gchar *countryname = nullptr;
 849         gchar *countryalpha2 = nullptr;
 850
 851         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 852
 853         g_free(exif_date_time);
 854         g_free(countryname);
 855         g_free(countryalpha2);
 856
 857         return timezone;
 858 }
 859
 860 /**
 861  * @brief Gets countryname from GPS lat/long
 862  * @param[in] exif
 863  * @returns Countryname string
 864  *
 865  *
 866  */
 867 static gchar *exif_build_formatted_countryname(ExifData *exif)
 868 {
 869         gchar *exif_date_time = nullptr;
 870         gchar *timezone = nullptr;
 871         gchar *countryname = nullptr;
 872         gchar *countryalpha2 = nullptr;
 873
 874         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 875
 876         g_free(exif_date_time);
 877         g_free(timezone);
 878         g_free(countryalpha2);
 879
 880         return countryname;
 881 }
 882
 883 /**
 884  * @brief Gets two-letter country code from GPS lat/long
 885  * @param[in] exif
 886  * @returns Countryalpha2 string
 887  *
 888  *
 889  */
 890 static gchar *exif_build_formatted_countrycode(ExifData *exif)
 891 {
 892         gchar *exif_date_time = nullptr;
 893         gchar *timezone = nullptr;
 894         gchar *countryname = nullptr;
 895         gchar *countryalpha2 = nullptr;
 896
 897         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 898
 899         g_free(exif_date_time);
 900         g_free(timezone);
 901         g_free(countryname);
 902
 903         return countryalpha2;
 904 }
 905
 906 static gchar *exif_build_formatted_star_rating(ExifData *exif)
 907 {
 908         gint n = 0;
 909
 910         exif_get_integer(exif, "Xmp.xmp.Rating", &n);
 911
 912         return convert_rating_to_stars(n);
 913 }
 914
 915 /* List of custom formatted pseudo-exif tags */
 916 #define EXIF_FORMATTED_TAG(name, label) { EXIF_FORMATTED()#name, label, exif_build_formatted##_##name }
 917
 918 ExifFormattedText ExifFormattedList[] = {
 919         EXIF_FORMATTED_TAG(Camera,              N_("Camera")),
 920         EXIF_FORMATTED_TAG(DateTime,            N_("Date")),
 921         EXIF_FORMATTED_TAG(DateTimeDigitized,   N_("DateDigitized")),
 922         EXIF_FORMATTED_TAG(ShutterSpeed,        N_("Shutter speed")),
 923         EXIF_FORMATTED_TAG(Aperture,            N_("Aperture")),
 924         EXIF_FORMATTED_TAG(ExposureBias,        N_("Exposure bias")),
 925         EXIF_FORMATTED_TAG(ISOSpeedRating,      N_("ISO sensitivity")),
 926         EXIF_FORMATTED_TAG(FocalLength,         N_("Focal length")),
 927         EXIF_FORMATTED_TAG(FocalLength35mmFilm, N_("Focal length 35mm")),
 928         EXIF_FORMATTED_TAG(SubjectDistance,     N_("Subject distance")),
 929         EXIF_FORMATTED_TAG(Flash,               N_("Flash")),
 930         EXIF_FORMATTED_TAG(Resolution,          N_("Resolution")),
 931         EXIF_FORMATTED_TAG(ColorProfile,        N_("Color profile")),
 932         EXIF_FORMATTED_TAG(GPSPosition,         N_("GPS position")),
 933         EXIF_FORMATTED_TAG(GPSAltitude,         N_("GPS altitude")),
 934         EXIF_FORMATTED_TAG(localtime,           N_("Local time")),
 935         EXIF_FORMATTED_TAG(timezone,            N_("Time zone")),
 936         EXIF_FORMATTED_TAG(countryname,         N_("Country name")),
 937         EXIF_FORMATTED_TAG(countrycode,         N_("Country code")),
 938         EXIF_FORMATTED_TAG(star_rating,         N_("Star rating")),
 939         {"file.size",                           N_("File size"),        nullptr},
 940         {"file.date",                           N_("File date"),        nullptr},
 941         {"file.mode",                           N_("File mode"),        nullptr},
 942         {"file.ctime",                          N_("File ctime"),       nullptr},
 943         {"file.owner",                          N_("File owner"),       nullptr},
 944         {"file.group",                          N_("File group"),       nullptr},
 945         {"file.link",                           N_("File link"),        nullptr},
 946         {"file.class",                          N_("File class"),       nullptr},
 947         {"file.page_no",                        N_("Page no."),         nullptr},
 948         {"lua.lensID",                          N_("Lens"),             nullptr},
 949         { nullptr, nullptr, nullptr }
 950 };
 951
 952 gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gboolean *key_valid)
 953 {
 954         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0)
 955                 {
 956                 gint i;
 957
 958                 if (key_valid) *key_valid = TRUE;
 959
 960                 key += EXIF_FORMATTED_LEN;
 961                 for (i = 0; ExifFormattedList[i].key; i++)
 962                         if (ExifFormattedList[i].build_func && strcmp(key, ExifFormattedList[i].key + EXIF_FORMATTED_LEN) == 0)
 963                                 return ExifFormattedList[i].build_func(exif);
 964                 }
 965
 966         if (key_valid) *key_valid = FALSE;
 967         return nullptr;
 968 }
 969
 970 gchar *exif_get_description_by_key(const gchar *key)
 971 {
 972         if (!key) return nullptr;
 973
 974         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0 || strncmp(key, "file.", 5) == 0 || strncmp(key, "lua.", 4) == 0)
 975                 {
 976                 gint i;
 977
 978                 for (i = 0; ExifFormattedList[i].key; i++)
 979                         if (strcmp(key, ExifFormattedList[i].key) == 0)
 980                                 return g_strdup(_(ExifFormattedList[i].description));
 981                 }
 982
 983         return exif_get_tag_description_by_key(key);
 984 }
 985
 986 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
 987 {
 988         ExifItem *item;
 989
 990         item = exif_get_item(exif, key);
 991         return exif_item_get_integer(item, value);
 992 }
 993
 994 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
 995 {
 996         ExifItem *item;
 997
 998         item = exif_get_item(exif, key);
 999         return exif_item_get_rational(item, sign, 0);
1000 }
1001
1002 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
1003 {
1004         ExifItem *item;
1005         gchar *text;
1006         gboolean key_valid;
1007
1008         if (!key) return nullptr;
1009
1010         text = exif_get_formatted_by_key(exif, key, &key_valid);
1011         if (key_valid) return text;
1012
1013         item = exif_get_item(exif, key);
1014         if (item) return exif_item_get_data_as_text(item, exif);
1015
1016         return nullptr;
1017 }
1018
1019
1020 static FileCacheData *exif_cache;
1021
1022 void exif_release_cb(FileData *fd)
1023 {
1024         exif_free(fd->exif);
1025         fd->exif = nullptr;
1026 }
1027
1028 void exif_init_cache()
1029 {
1030         g_assert(!exif_cache);
1031         exif_cache = file_cache_new(exif_release_cb, 4);
1032 }
1033
1034 ExifData *exif_read_fd(FileData *fd)
1035 {
1036         gchar *sidecar_path;
1037
1038         if (!exif_cache) exif_init_cache();
1039
1040         if (!fd) return nullptr;
1041
1042         if (file_cache_get(exif_cache, fd)) return fd->exif;
1043         g_assert(fd->exif == nullptr);
1044
1045         /* CACHE_TYPE_XMP_METADATA file should exist only if the metadata are
1046          * not writable directly, thus it should contain the most up-to-date version */
1047         sidecar_path = nullptr;
1048
1049 #if HAVE_EXIV2
1050         /* we are not able to handle XMP sidecars without exiv2 */
1051         sidecar_path = cache_find_location(CACHE_TYPE_XMP_METADATA, fd->path);
1052
1053         if (!sidecar_path) sidecar_path = file_data_get_sidecar_path(fd, TRUE);
1054 #endif
1055
1056         fd->exif = exif_read(fd->path, sidecar_path, fd->modified_xmp);
1057
1058         g_free(sidecar_path);
1059         file_cache_put(exif_cache, fd, 1);
1060         return fd->exif;
1061 }
1062
1063
1064 void exif_free_fd(FileData *fd, ExifData *exif)
1065 {
1066         if (!fd) return;
1067         g_assert(fd->exif == exif);
1068 }
1069
1070 /* embedded icc in jpeg */
1071
1072 gboolean exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
1073 {
1074         guint seg_offset = 0;
1075         guint seg_length = 0;
1076         guint chunk_offset[255];
1077         guint chunk_length[255];
1078         guint chunk_count = 0;
1079
1080         /* For jpeg/jfif, ICC color profile data can be in more than one segment.
1081            the data is in APP2 data segments that start with "ICC_PROFILE\x00\xNN\xTT"
1082            NN = segment number for data
1083            TT = total number of ICC segments (TT in each ICC segment should match)
1084          */
1085
1086         while (jpeg_segment_find(data + seg_offset + seg_length,
1087                                       size - seg_offset - seg_length,
1088                                       JPEG_MARKER_APP2,
1089                                       "ICC_PROFILE\x00", 12,
1090                                       &seg_offset, &seg_length))
1091                 {
1092                 guchar chunk_num;
1093                 guchar chunk_tot;
1094
1095                 if (seg_length < 14) return FALSE;
1096
1097                 chunk_num = data[seg_offset + 12];
1098                 chunk_tot = data[seg_offset + 13];
1099
1100                 if (chunk_num == 0 || chunk_tot == 0) return FALSE;
1101
1102                 if (chunk_count == 0)
1103                         {
1104                         guint i;
1105
1106                         chunk_count = static_cast<guint>(chunk_tot);
1107                         for (i = 0; i < chunk_count; i++) chunk_offset[i] = 0;
1108                         for (i = 0; i < chunk_count; i++) chunk_length[i] = 0;
1109                         }
1110
1111                 if (chunk_tot != chunk_count ||
1112                     chunk_num > chunk_count) return FALSE;
1113
1114                 chunk_num--;
1115                 chunk_offset[chunk_num] = seg_offset + 14;
1116                 chunk_length[chunk_num] = seg_length - 14;
1117                 }
1118
1119         if (chunk_count > 0)
1120                 {
1121                 guchar *cp_data;
1122                 guint cp_length = 0;
1123                 guint i;
1124
1125                 for (i = 0; i < chunk_count; i++) cp_length += chunk_length[i];
1126                 cp_data = static_cast<guchar *>(g_malloc(cp_length));
1127
1128                 for (i = 0; i < chunk_count; i++)
1129                         {
1130                         if (chunk_offset[i] == 0)
1131                                 {
1132                                 /* error, we never saw this chunk */
1133                                 g_free(cp_data);
1134                                 return FALSE;
1135                                 }
1136                         memcpy(cp_data, data + chunk_offset[i], chunk_length[i]);
1137                         }
1138                 DEBUG_1("Found embedded icc profile in jpeg");
1139                 exif_add_jpeg_color_profile(exif, cp_data, cp_length);
1140
1141                 return TRUE;
1142                 }
1143
1144         return FALSE;
1145 }
1146
1147 /*
1148  *-------------------------------------------------------------------
1149  * file info
1150  * it is here because it shares tag neming infrastructure with exif
1151  * we should probably not invest too much effort into this because
1152  * new exiv2 will support the same functionality
1153  * https://dev.exiv2.org/issues/505
1154  *-------------------------------------------------------------------
1155  */
1156
1157 static gchar *mode_number(mode_t m)
1158 {
1159         gint mb;
1160         gint mu;
1161         gint mg;
1162         gint mo;
1163         gchar pbuf[12];
1164
1165         mb = mu = mg = mo = 0;
1166
1167         if (m & S_ISUID) mb |= 4;
1168         if (m & S_ISGID) mb |= 2;
1169         if (m & S_ISVTX) mb |= 1;
1170
1171         if (m & S_IRUSR) mu |= 4;
1172         if (m & S_IWUSR) mu |= 2;
1173         if (m & S_IXUSR) mu |= 1;
1174
1175         if (m & S_IRGRP) mg |= 4;
1176         if (m & S_IWGRP) mg |= 2;
1177         if (m & S_IXGRP) mg |= 1;
1178
1179         if (m & S_IROTH) mo |= 4;
1180         if (m & S_IWOTH) mo |= 2;
1181         if (m & S_IXOTH) mo |= 1;
1182
1183         pbuf[0] = (m & S_IRUSR) ? 'r' : '-';
1184         pbuf[1] = (m & S_IWUSR) ? 'w' : '-';
1185         pbuf[2] = (m & S_IXUSR) ? 'x' : '-';
1186         pbuf[3] = (m & S_IRGRP) ? 'r' : '-';
1187         pbuf[4] = (m & S_IWGRP) ? 'w' : '-';
1188         pbuf[5] = (m & S_IXGRP) ? 'x' : '-';
1189         pbuf[6] = (m & S_IROTH) ? 'r' : '-';
1190         pbuf[7] = (m & S_IWOTH) ? 'w' : '-';
1191         pbuf[8] = (m & S_IXOTH) ? 'x' : '-';
1192         pbuf[9] = '\0';
1193
1194         return g_strdup_printf("%s (%d%d%d%d)", pbuf, mb, mu, mg, mo);
1195 }
1196
1197 gchar *metadata_file_info(FileData *fd, const gchar *key, MetadataFormat)
1198 {
1199         gchar *page_n_of_m;
1200
1201         if (strcmp(key, "file.size") == 0)
1202                 {
1203                 return g_strdup_printf("%ld", static_cast<long>(fd->size));
1204                 }
1205         if (strcmp(key, "file.date") == 0)
1206                 {
1207                 return g_strdup(text_from_time(fd->date));
1208                 }
1209         if (strcmp(key, "file.mode") == 0)
1210                 {
1211                 return mode_number(fd->mode);
1212                 }
1213         if (strcmp(key, "file.ctime") == 0)
1214                 {
1215                 return g_strdup(text_from_time(fd->cdate));
1216                 }
1217         if (strcmp(key, "file.class") == 0)
1218                 {
1219                 return g_strdup(format_class_list[fd->format_class]);
1220                 }
1221         if (strcmp(key, "file.owner") == 0)
1222                 {
1223                 return g_strdup(fd->owner);
1224                 }
1225         if (strcmp(key, "file.group") == 0)
1226                 {
1227                 return g_strdup(fd->group);
1228                 }
1229         if (strcmp(key, "file.link") == 0)
1230                 {
1231                 return g_strdup(fd->sym_link);
1232                 }
1233         if (strcmp(key, "file.page_no") == 0)
1234                 {
1235                 if (fd->page_total > 1)
1236                         {
1237                         page_n_of_m = g_strdup_printf("[%d/%d]", fd->page_num + 1, fd->page_total);
1238                         return page_n_of_m;
1239                         }
1240
1241                 return nullptr;
1242                 }
1243         return g_strdup("");
1244 }
1245
1246 #if HAVE_LUA
1247 gchar *metadata_lua_info(FileData *fd, const gchar *key, MetadataFormat)
1248 {
1249         gchar *script_name;
1250         gchar *script_name_utf8;
1251         gchar *data;
1252         gchar *raw_data;
1253         gchar *valid_data;
1254
1255         script_name_utf8 = g_strdup(key + 4);
1256         script_name = path_from_utf8(script_name_utf8);
1257
1258         raw_data = lua_callvalue(fd, script_name, nullptr);
1259         valid_data = g_utf8_make_valid(raw_data, -1);
1260         data = g_utf8_substring(valid_data, 0, 150);
1261
1262         g_free(script_name);
1263         g_free(script_name_utf8);
1264         g_free(raw_data);
1265         g_free(valid_data);
1266
1267         return data;
1268 }
1269 #endif
1270 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */