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