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 <cmath>
  27 #include <cstdlib>
  28 #include <cstring>
  29
  30 #ifdef HAVE_LCMS
  31 /*** color support enabled ***/
  32
  33 #ifdef HAVE_LCMS2
  34 #include <lcms2.h>
  35 #else
  36 #include <lcms.h>
  37 #endif
  38 #endif
  39
  40 #include "cache.h"
  41 #include "debug.h"
  42 #include "exif.h"
  43 #include "filecache.h"
  44 #include "glua.h"
  45 #include "intl.h"
  46 #include "jpeg-parser.h"
  47 #include "main-defines.h"
  48 #include "misc.h"
  49 #include "ui-fileops.h"
  50 #include "zonedetect.h"
  51
  52
  53 static gdouble exif_rational_to_double(ExifRational *r, gint sign)
  54 {
  55         if (!r || r->den == 0.0) return 0.0;
  56
  57         if (sign) return static_cast<gdouble>(static_cast<gint>(r->num)) / static_cast<gdouble>(static_cast<gint>(r->den));
  58         return static_cast<gdouble>(r->num) / r->den;
  59 }
  60
  61 static gdouble exif_get_rational_as_double(ExifData *exif, const gchar *key)
  62 {
  63         ExifRational *r;
  64         gint sign;
  65
  66         r = exif_get_rational(exif, key, &sign);
  67         return exif_rational_to_double(r, sign);
  68 }
  69
  70 static GString *append_comma_text(GString *string, const gchar *text)
  71 {
  72         string = g_string_append(string, ", ");
  73         string = g_string_append(string, text);
  74
  75         return string;
  76 }
  77
  78 static gchar *remove_common_prefix(gchar *s, gchar *t)
  79 {
  80         gint i;
  81
  82         if (!s || !t) return t;
  83
  84         for (i = 0; s[i] && t[i] && s[i] == t[i]; i++)
  85                 ;
  86         if (!i)
  87                 return t;
  88         if (s[i-1] == ' ' || !s[i])
  89                 {
  90                 while (t[i] == ' ')
  91                         i++;
  92                 return t + i;
  93                 }
  94         return s;
  95 }
  96
  97 static gdouble get_crop_factor(ExifData *exif)
  98 {
  99         gdouble res_unit_tbl[] = {0.0, 25.4, 25.4, 10.0, 1.0, 0.001 };
 100         gdouble xres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneXResolution");
 101         gdouble yres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneYResolution");
 102         gint res_unit;
 103         gint w;
 104         gint h;
 105         gdouble xsize;
 106         gdouble ysize;
 107         gdouble size;
 108         gdouble ratio;
 109
 110         if (xres == 0.0 || yres == 0.0) return 0.0;
 111
 112         if (!exif_get_integer(exif, "Exif.Photo.FocalPlaneResolutionUnit", &res_unit)) return 0.0;
 113         if (res_unit < 1 || res_unit > 5) return 0.0;
 114
 115         if (!exif_get_integer(exif, "Exif.Photo.PixelXDimension", &w)) return 0.0;
 116         if (!exif_get_integer(exif, "Exif.Photo.PixelYDimension", &h)) return 0.0;
 117
 118         xsize = w * res_unit_tbl[res_unit] / xres;
 119         ysize = h * res_unit_tbl[res_unit] / yres;
 120
 121         ratio = xsize / ysize;
 122
 123         if (ratio < 0.5 || ratio > 2.0) return 0.0; /* reasonable ratio */
 124
 125         size = hypot(xsize, ysize);
 126
 127         if (size < 1.0 || size > 100.0) return 0.0; /* reasonable sensor size in mm */
 128
 129         return hypot(36, 24) / size;
 130 }
 131
 132 static gboolean remove_suffix(gchar *str, const gchar *suffix, gint suffix_len)
 133 {
 134         gint str_len = strlen(str);
 135
 136         if (suffix_len < 0) suffix_len = strlen(suffix);
 137         if (str_len < suffix_len) return FALSE;
 138
 139         if (strcmp(str + str_len - suffix_len, suffix) != 0) return FALSE;
 140         str[str_len - suffix_len] = '\0';
 141
 142         return TRUE;
 143 }
 144
 145 static gchar *exif_build_formatted_Camera(ExifData *exif)
 146 {
 147         gchar *text;
 148         gchar *make = exif_get_data_as_text(exif, "Exif.Image.Make");
 149         gchar *model = exif_get_data_as_text(exif, "Exif.Image.Model");
 150         gchar *software = exif_get_data_as_text(exif, "Exif.Image.Software");
 151         gchar *model2;
 152         gchar *software2;
 153
 154         if (make)
 155                 {
 156                 g_strstrip(make);
 157
 158                 if (remove_suffix(make, " CORPORATION", 12)) { /* Nikon */ }
 159                 else if (remove_suffix(make, " Corporation", 12)) { /* Pentax */ }
 160                 else if (remove_suffix(make, " OPTICAL CO.,LTD", 16)) { /* OLYMPUS */ };
 161                 }
 162
 163         if (model)
 164                 g_strstrip(model);
 165
 166         if (software)
 167                 {
 168                 gint i;
 169                 gint j;
 170
 171                 g_strstrip(software);
 172
 173                 /* remove superfluous spaces (pentax K100D) */
 174                 for (i = 0, j = 0; software[i]; i++, j++)
 175                         {
 176                         if (software[i] == ' ' && software[i + 1] == ' ')
 177                                 i++;
 178                         if (i != j) software[j] = software[i];
 179                         }
 180                 software[j] = '\0';
 181                 }
 182
 183         model2 = remove_common_prefix(make, model);
 184         software2 = remove_common_prefix(model2, software);
 185
 186         text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", (make && model2) ? " " : "",
 187                                                (model2) ? model2 : "",
 188                                                (software2 && (make || model2)) ? " (" : "",
 189                                                (software2) ? software2 : "",
 190                                                (software2 && (make || model2)) ? ")" : "");
 191
 192         g_free(make);
 193         g_free(model);
 194         g_free(software);
 195         return text;
 196 }
 197
 198 static gchar *exif_build_formatted_DateTime(ExifData *exif)
 199 {
 200         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeOriginal");
 201         gchar *subsec = nullptr;
 202         gchar buf[128];
 203         gchar *tmp;
 204         gint buflen;
 205         struct tm tm;
 206         GError *error = nullptr;
 207
 208         if (text)
 209                 {
 210                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeOriginal");
 211                 }
 212         else
 213                 {
 214                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 215                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 216                 }
 217
 218         /* Convert the stuff into a tm struct */
 219         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 220         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 221                 {
 222                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 223                 if (buflen > 0)
 224                         {
 225                         tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 226                         if (error)
 227                                 {
 228                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 229                                 g_error_free(error);
 230                                 }
 231                         else
 232                                 {
 233                                 g_free(text);
 234                                 text = g_strdup(tmp);
 235                                 }
 236                         }
 237                 }
 238
 239         if (subsec)
 240                 {
 241                 tmp = text;
 242                 text = g_strconcat(tmp, ".", subsec, NULL);
 243                 g_free(tmp);
 244                 g_free(subsec);
 245                 }
 246         return text;
 247 }
 248
 249 static gchar *exif_build_formatted_DateTimeDigitized(ExifData *exif)
 250 {
 251         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeDigitized");
 252         gchar *subsec = nullptr;
 253         gchar buf[128];
 254         gchar *tmp;
 255         gint buflen;
 256         struct tm tm;
 257         GError *error = nullptr;
 258
 259         if (text)
 260                 {
 261                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeDigitized");
 262                 }
 263         else
 264                 {
 265                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 266                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 267                 }
 268
 269         /* Convert the stuff into a tm struct */
 270         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 271         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 272                 {
 273                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 274                 if (buflen > 0)
 275                         {
 276                         tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 277                         if (error)
 278                                 {
 279                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 280                                 g_error_free(error);
 281                                 }
 282                         else
 283                                 {
 284                                 g_free(text);
 285                                 text = g_strdup(tmp);
 286                                 }
 287                         }
 288                 }
 289
 290         if (subsec)
 291                 {
 292                 tmp = text;
 293                 text = g_strconcat(tmp, ".", subsec, NULL);
 294                 g_free(tmp);
 295                 g_free(subsec);
 296                 }
 297         return text;
 298 }
 299
 300 static gchar *exif_build_formatted_ShutterSpeed(ExifData *exif)
 301 {
 302         ExifRational *r;
 303
 304         r = exif_get_rational(exif, "Exif.Photo.ExposureTime", nullptr);
 305         if (r && r->num && r->den)
 306                 {
 307                 gdouble n = static_cast<gdouble>(r->den) / static_cast<gdouble>(r->num);
 308                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 309                                                   n > 1.0 ? n : 1.0 / n);
 310                 }
 311         r = exif_get_rational(exif, "Exif.Photo.ShutterSpeedValue", nullptr);
 312         if (r && r->num  && r->den)
 313                 {
 314                 gdouble n = pow(2.0, exif_rational_to_double(r, TRUE));
 315
 316                 /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
 317                 if (n > 1.0 && static_cast<gint>(n) - (static_cast<gint>(n/10))*10 == 1) n--;
 318
 319                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 320                                                   n > 1.0 ? floor(n) : 1.0 / n);
 321                 }
 322         return nullptr;
 323 }
 324
 325 static gchar *exif_build_formatted_Aperture(ExifData *exif)
 326 {
 327         gdouble n;
 328
 329         n = exif_get_rational_as_double(exif, "Exif.Photo.FNumber");
 330         if (n == 0.0) n = exif_get_rational_as_double(exif, "Exif.Photo.ApertureValue");
 331         if (n == 0.0) return nullptr;
 332
 333         return g_strdup_printf("f/%.1f", n);
 334 }
 335
 336 static gchar *exif_build_formatted_ExposureBias(ExifData *exif)
 337 {
 338         ExifRational *r;
 339         gint sign;
 340         gdouble n;
 341
 342         r = exif_get_rational(exif, "Exif.Photo.ExposureBiasValue", &sign);
 343         if (!r) return nullptr;
 344
 345         n = exif_rational_to_double(r, sign);
 346         return g_strdup_printf("%+.1f", n);
 347 }
 348
 349 static gchar *exif_build_formatted_FocalLength(ExifData *exif)
 350 {
 351         gdouble n;
 352
 353         n = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 354         if (n == 0.0) return nullptr;
 355         return g_strdup_printf("%.0f mm", n);
 356 }
 357
 358 static gchar *exif_build_formatted_FocalLength35mmFilm(ExifData *exif)
 359 {
 360         gint n;
 361         gdouble f;
 362         gdouble c;
 363
 364         if (exif_get_integer(exif, "Exif.Photo.FocalLengthIn35mmFilm", &n) && n != 0)
 365                 {
 366                 return g_strdup_printf("%d mm", n);
 367                 }
 368
 369         f = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 370         if (f == 0.0) return nullptr;
 371
 372         c = get_crop_factor(exif);
 373         if (c == 0.0) return nullptr;
 374
 375         return g_strdup_printf("%.0f mm", f * c);
 376 }
 377
 378 static gchar *exif_build_formatted_ISOSpeedRating(ExifData *exif)
 379 {
 380         gchar *text;
 381
 382         text = exif_get_data_as_text(exif, "Exif.Photo.ISOSpeedRatings");
 383         /* old canon may set this instead */
 384         if (!text) text = exif_get_data_as_text(exif, "Exif.CanonSi.ISOSpeed");
 385         /* kodak may set this instead */
 386         if (!text) text = exif_get_data_as_text(exif, "Exif.Photo.ExposureIndex");
 387         return text;
 388 }
 389
 390 static gchar *exif_build_formatted_SubjectDistance(ExifData *exif)
 391 {
 392         ExifRational *r;
 393         gint sign;
 394         gdouble n;
 395
 396         r = exif_get_rational(exif, "Exif.Photo.SubjectDistance", &sign);
 397         if (!r) return nullptr;
 398
 399         if (static_cast<glong>(r->num) == static_cast<glong>(0xffffffff)) return g_strdup(_("infinity"));
 400         if (static_cast<glong>(r->num) == 0) return g_strdup(_("unknown"));
 401
 402         n = exif_rational_to_double(r, sign);
 403         if (n == 0.0) return _("unknown");
 404         return g_strdup_printf("%.3f m", n);
 405 }
 406
 407 static gchar *exif_build_formatted_Flash(ExifData *exif)
 408 {
 409         /* grr, flash is a bitmask... */
 410         GString *string;
 411         gint n;
 412         gint v;
 413
 414         if (!exif_get_integer(exif, "Exif.Photo.Flash", &n)) return nullptr;
 415
 416         /* Exif 2.1 only defines first 3 bits */
 417         if (n <= 0x07) return exif_get_data_as_text(exif, "Exif.Photo.Flash");
 418
 419         /* must be Exif 2.2 */
 420         string = g_string_new("");
 421
 422         /* flash fired (bit 0) */
 423         string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
 424
 425         /* flash mode (bits 3, 4) */
 426         v = (n >> 3) & 0x03;
 427         if (v) string = append_comma_text(string, _("mode:"));
 428         switch (v)
 429                 {
 430                 case 1:
 431                         string = g_string_append(string, _("on"));
 432                         break;
 433                 case 2:
 434                         string = g_string_append(string, _("off"));
 435                         break;
 436                 case 3:
 437                         string = g_string_append(string, _("auto"));
 438                         break;
 439                 }
 440
 441         /* return light (bits 1, 2) */
 442         v = (n >> 1) & 0x03;
 443         if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
 444         if (v == 3) string = append_comma_text(string, _("detected by strobe"));
 445
 446         /* we ignore flash function (bit 5) */
 447
 448         /* red-eye (bit 6) */
 449         if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
 450
 451         return g_string_free(string, FALSE);
 452 }
 453
 454 static gchar *exif_build_formatted_Resolution(ExifData *exif)
 455 {
 456         ExifRational *rx;
 457         ExifRational *ry;
 458         gchar *units;
 459         gchar *text;
 460
 461         rx = exif_get_rational(exif, "Exif.Image.XResolution", nullptr);
 462         ry = exif_get_rational(exif, "Exif.Image.YResolution", nullptr);
 463         if (!rx || !ry) return nullptr;
 464
 465         units = exif_get_data_as_text(exif, "Exif.Image.ResolutionUnit");
 466         text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? static_cast<gdouble>(rx->num) / rx->den : 1.0,
 467                                                       ry->den ? static_cast<gdouble>(ry->num) / ry->den : 1.0,
 468                                                       _("dot"), (units) ? units : _("unknown"));
 469
 470         g_free(units);
 471         return text;
 472 }
 473
 474 static gchar *exif_build_formatted_ColorProfile(ExifData *exif)
 475 {
 476 #ifdef HAVE_LCMS2
 477         cmsUInt8Number profileID[17];
 478 #endif
 479         const gchar *name = "";
 480         const gchar *source = "";
 481         guchar *profile_data;
 482         guint profile_len;
 483
 484         profile_data = exif_get_color_profile(exif, &profile_len);
 485         if (!profile_data)
 486                 {
 487                 gint cs;
 488                 gchar *interop_index;
 489
 490                 /* ColorSpace == 1 specifies sRGB per EXIF 2.2 */
 491                 if (!exif_get_integer(exif, "Exif.Photo.ColorSpace", &cs)) cs = 0;
 492                 interop_index = exif_get_data_as_text(exif, "Exif.Iop.InteroperabilityIndex");
 493
 494                 if (cs == 1)
 495                         {
 496                         name = _("sRGB");
 497                         source = "ColorSpace";
 498                         }
 499                 else if (cs == 2 || (interop_index && !strcmp(interop_index, "R03")))
 500                         {
 501                         name = _("AdobeRGB");
 502                         source = (cs == 2) ? "ColorSpace" : "Iop";
 503                         }
 504
 505                 g_free(interop_index);
 506                 }
 507         else
 508                 {
 509                 source = _("embedded");
 510 #ifdef HAVE_LCMS
 511
 512                         {
 513                         cmsHPROFILE profile;
 514
 515                         profile = cmsOpenProfileFromMem(profile_data, profile_len);
 516                         if (profile)
 517                                 {
 518 #ifdef HAVE_LCMS2
 519                                 profileID[16] = '\0';
 520                                 cmsGetHeaderProfileID(profile, profileID);
 521                                 name = reinterpret_cast<gchar *>(profileID);
 522 #else
 523                                 name = (gchar *) cmsTakeProductName(profile);
 524 #endif
 525                                 cmsCloseProfile(profile);
 526                                 }
 527                         g_free(profile_data);
 528                         }
 529 #endif
 530                 }
 531         if (name[0] == 0 && source[0] == 0) return nullptr;
 532         return g_strdup_printf("%s (%s)", name, source);
 533 }
 534
 535 static gchar *exif_build_formatted_GPSPosition(ExifData *exif)
 536 {
 537         GString *string;
 538         gchar *ref;
 539         ExifRational *value;
 540         ExifItem *item;
 541         guint i;
 542         gdouble p;
 543         gdouble p3;
 544         gulong p1;
 545         gulong p2;
 546
 547         string = g_string_new("");
 548
 549         item = exif_get_item(exif, "Exif.GPSInfo.GPSLatitude");
 550         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 551         if (item && ref)
 552                 {
 553                 p = 0;
 554                 for (i = 0; i < exif_item_get_elements(item); i++)
 555                         {
 556                         value = exif_item_get_rational(item, nullptr, i);
 557                         if (value && value->num && value->den)
 558                                 p += static_cast<gdouble>(value->num) / static_cast<gdouble>(value->den) / pow(60.0, static_cast<gdouble>(i));
 559                         }
 560                 p1 = static_cast<gint>(p);
 561                 p2 = static_cast<gint>((p - p1)*60);
 562                 p3 = ((p - p1)*60 - p2)*60;
 563
 564                 g_string_append_printf(string, "%0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 565                 } // if (item && ref)
 566
 567         item = exif_get_item(exif, "Exif.GPSInfo.GPSLongitude");
 568         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 569         if (item && ref)
 570                 {
 571                 p = 0;
 572                 for (i = 0; i < exif_item_get_elements(item); i++)
 573                         {
 574                         value = exif_item_get_rational(item, nullptr, i);
 575                         if (value && value->num && value->den)
 576                         p += static_cast<gdouble>(value->num) / static_cast<gdouble>(value->den) / pow(60.0, static_cast<gdouble>(i));
 577                         }
 578                 p1 = static_cast<gint>(p);
 579                 p2 = static_cast<gint>((p - p1)*60);
 580                 p3 = ((p - p1)*60 - p2)*60;
 581
 582                 g_string_append_printf(string, ", %0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 583                 } // if (item && ref)
 584
 585         return g_string_free(string, FALSE);
 586 } // static gchar *exif_build_forma...
 587
 588 static gchar *exif_build_formatted_GPSAltitude(ExifData *exif)
 589 {
 590         ExifRational *r;
 591         ExifItem *item;
 592         gdouble alt;
 593         gint ref;
 594
 595         item = exif_get_item(exif, "Exif.GPSInfo.GPSAltitudeRef");
 596         r = exif_get_rational(exif, "Exif.GPSInfo.GPSAltitude", nullptr);
 597
 598         if (!r || !item) return nullptr;
 599
 600         alt = exif_rational_to_double(r, 0);
 601         exif_item_get_integer(item, &ref);
 602
 603         return g_strdup_printf("%0.f m %s", alt, (ref==0)?_("Above Sea Level"):_("Below Sea Level"));
 604 }
 605
 606 /**
 607  * @brief Extracts timezone data from a ZoneDetect search structure
 608  * @param[in] results ZoneDetect search structure
 609  * @param[out] timezone in the form "Europe/London"
 610  * @param[out] countryname in the form "United Kingdom"
 611  * @param[out] countryalpha2 in the form "GB"
 612  *
 613  * Refer to https://github.com/BertoldVdb/ZoneDetect
 614  * for structure details
 615  */
 616 static void zd_tz(ZoneDetectResult *results, gchar **timezone, gchar **countryname, gchar **countryalpha2)
 617 {
 618         gchar *timezone_pre = nullptr;
 619         gchar *timezone_id = nullptr;
 620         unsigned int index = 0;
 621
 622         while(results[index].lookupResult != ZD_LOOKUP_END)
 623                 {
 624                 if(results[index].data)
 625                         {
 626                         for(unsigned int i=0; i<results[index].numFields; i++)
 627                                 {
 628                                 if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneIdPrefix"))
 629                                         {
 630                                         timezone_pre = g_strdup(results[index].data[i]);
 631                                         }
 632                                 if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneId"))
 633                                         {
 634                                         timezone_id = g_strdup(results[index].data[i]);
 635                                         }
 636                                 if (g_strstr_len(results[index].fieldNames[i], -1, "CountryName"))
 637                                         {
 638                                         *countryname = g_strdup(results[index].data[i]);
 639                                         }
 640                                 if (g_strstr_len(results[index].fieldNames[i], -1, "CountryAlpha2"))
 641                                         {
 642                                         *countryalpha2 = g_strdup(results[index].data[i]);
 643                                         }
 644                                 }
 645                         }
 646                 index++;
 647                 }
 648
 649         *timezone = g_strconcat(timezone_pre, timezone_id, NULL);
 650         g_free(timezone_pre);
 651         g_free(timezone_id);
 652 }
 653
 654 void ZoneDetect_onError(int errZD, int errNative)
 655 {
 656         log_printf("Error: ZoneDetect %s (0x%08X)\n", ZDGetErrorString(errZD), (unsigned)errNative);
 657 }
 658
 659 /**
 660  * @brief Gets timezone data from an exif structure
 661  * @param[in] exif
 662  * @returns TRUE if timezone data found AND GPS date and time found
 663  * @param[out] exif_date_time exif date/time in the form 2018:11:30:17:05:04
 664  * @param[out] timezone in the form "Europe/London"
 665  * @param[out] countryname in the form "United Kingdom"
 666  * @param[out] countryalpha2 in the form "GB"
 667  *
 668  *
 669  */
 670 static gboolean exif_build_tz_data(ExifData *exif, gchar **exif_date_time, gchar **timezone, gchar **countryname, gchar **countryalpha2)
 671 {
 672         gfloat latitude;
 673         gfloat longitude;
 674         gchar *text_latitude;
 675         gchar *text_longitude;
 676         gchar *text_latitude_ref;
 677         gchar *text_longitude_ref;
 678         gchar *text_date;
 679         gchar *text_time;
 680         gchar *lat_deg;
 681         gchar *lat_min;
 682         gchar *lon_deg;
 683         gchar *lon_min;
 684         gchar *timezone_path;
 685         ZoneDetect *cd;
 686         ZoneDetectResult *results;
 687         gboolean ret = FALSE;
 688
 689         text_latitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitude");
 690         text_longitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitude");
 691         text_latitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 692         text_longitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 693         text_date = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSDateStamp");
 694         text_time = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSTimeStamp");
 695
 696         if (text_latitude && text_longitude && text_latitude_ref && text_longitude_ref)
 697                 {
 698                 lat_deg = strtok(text_latitude, "deg'");
 699                 lat_min = strtok(nullptr, "deg'");
 700                 if (!lat_deg || !lat_min)
 701                         {
 702                         return FALSE;
 703                         }
 704                 latitude = atof(lat_deg) + atof(lat_min) / 60;
 705                 if (!g_strcmp0(text_latitude_ref, "South"))
 706                         {
 707                         latitude = -latitude;
 708                         }
 709                 lon_deg = strtok(text_longitude, "deg'");
 710                 lon_min = strtok(nullptr, "deg'");
 711                 if (!lon_deg || !lon_min)
 712                         {
 713                         return FALSE;
 714                         }
 715                 longitude = atof(lon_deg) + atof(lon_min) / 60;
 716                 if (!g_strcmp0(text_longitude_ref, "West"))
 717                         {
 718                         longitude = -longitude;
 719                         }
 720
 721                 timezone_path = g_build_filename(get_rc_dir(), TIMEZONE_DATABASE_FILE, NULL);
 722                 if (g_file_test(timezone_path, G_FILE_TEST_EXISTS))
 723                         {
 724                         ZDSetErrorHandler(ZoneDetect_onError);
 725                         cd = ZDOpenDatabase(timezone_path);
 726                         if (cd)
 727                                 {
 728                                 results = ZDLookup(cd, latitude, longitude, nullptr);
 729                                 if (results)
 730                                         {
 731                                         zd_tz(results, timezone, countryname, countryalpha2);
 732                                         ret = TRUE;
 733                                         }
 734                                 }
 735                         else
 736                                 {
 737                                 log_printf("Error: Init of timezone database %s failed\n", timezone_path);
 738                                 }
 739                         ZDCloseDatabase(cd);
 740                         }
 741                 g_free(timezone_path);
 742                 }
 743
 744         if (ret && text_date && text_time)
 745                 {
 746                 *exif_date_time = g_strconcat(text_date, ":", text_time, NULL);
 747                 }
 748         else
 749                 {
 750                 ret = FALSE;
 751                 }
 752         return ret;
 753 }
 754
 755 /**
 756  * @brief Creates local time from GPS lat/long
 757  * @param[in] exif
 758  * @returns Localised time and date
 759  *
 760  * GPS lat/long is translated to timezone using ZoneDetect.
 761  * GPS UTC is converted to Unix time stamp (seconds since 1970).
 762  * The TZ environment variable is set to the relevant timezone
 763  * and the Unix timestamp converted to local time using locale.
 764  * If the conversion fails, unformatted UTC is returned.
 765  */
 766 static gchar *exif_build_formatted_localtime(ExifData *exif)
 767 {
 768         gchar buf[128];
 769         gchar *tmp;
 770         gint buflen;
 771         GError *error = nullptr;
 772         gchar *time_zone_image;
 773         gchar *time_zone_org;
 774         struct tm *tm_local;
 775         struct tm tm_utc;
 776         time_t stamp;
 777         gchar *exif_date_time = nullptr;
 778         gchar *timezone = nullptr;
 779         gchar *countryname = nullptr;
 780         gchar *countryalpha2 = nullptr;
 781
 782         if (exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2))
 783                 {
 784                 time_zone_image = g_strconcat("TZ=", timezone, NULL);
 785                 time_zone_org = g_strconcat("TZ=", getenv("TZ"), NULL);
 786                 setenv("TZ", "UTC", TRUE);
 787
 788                 memset(&tm_utc, 0, sizeof(tm_utc));
 789                 if (exif_date_time && strptime(exif_date_time, "%Y:%m:%d:%H:%M:%S", &tm_utc))
 790                         {
 791                         stamp = mktime(&tm_utc);        // Convert the struct to a Unix timestamp
 792                         putenv(time_zone_image);        // Switch to destination time zone
 793
 794                         tm_local = localtime(&stamp);
 795
 796                         /* Convert to localtime using locale */
 797                         buflen = strftime(buf, sizeof(buf), "%x %X", tm_local);
 798                         if (buflen > 0)
 799                                 {
 800                                 tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 801                                 if (error)
 802                                         {
 803                                         log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 804                                         g_error_free(error);
 805                                         }
 806                                 else
 807                                         {
 808                                         g_free(exif_date_time);
 809                                         exif_date_time = tmp;
 810                                         }
 811                                 }
 812                         }
 813                 putenv(time_zone_org);
 814
 815                 g_free(time_zone_image);
 816                 g_free(time_zone_org);
 817                 }
 818
 819         g_free(timezone);
 820         g_free(countryname);
 821         g_free(countryalpha2);
 822
 823         return exif_date_time;
 824 }
 825
 826 /**
 827  * @brief Gets timezone from GPS lat/long
 828  * @param[in] exif
 829  * @returns Timezone string in the form "Europe/London"
 830  *
 831  *
 832  */
 833 static gchar *exif_build_formatted_timezone(ExifData *exif)
 834 {
 835         gchar *exif_date_time = nullptr;
 836         gchar *timezone = nullptr;
 837         gchar *countryname = nullptr;
 838         gchar *countryalpha2 = nullptr;
 839
 840         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 841
 842         g_free(exif_date_time);
 843         g_free(countryname);
 844         g_free(countryalpha2);
 845
 846         return timezone;
 847 }
 848
 849 /**
 850  * @brief Gets countryname from GPS lat/long
 851  * @param[in] exif
 852  * @returns Countryname string
 853  *
 854  *
 855  */
 856 static gchar *exif_build_formatted_countryname(ExifData *exif)
 857 {
 858         gchar *exif_date_time = nullptr;
 859         gchar *timezone = nullptr;
 860         gchar *countryname = nullptr;
 861         gchar *countryalpha2 = nullptr;
 862
 863         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 864
 865         g_free(exif_date_time);
 866         g_free(timezone);
 867         g_free(countryalpha2);
 868
 869         return countryname;
 870 }
 871
 872 /**
 873  * @brief Gets two-letter country code from GPS lat/long
 874  * @param[in] exif
 875  * @returns Countryalpha2 string
 876  *
 877  *
 878  */
 879 static gchar *exif_build_formatted_countrycode(ExifData *exif)
 880 {
 881         gchar *exif_date_time = nullptr;
 882         gchar *timezone = nullptr;
 883         gchar *countryname = nullptr;
 884         gchar *countryalpha2 = nullptr;
 885
 886         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 887
 888         g_free(exif_date_time);
 889         g_free(timezone);
 890         g_free(countryname);
 891
 892         return countryalpha2;
 893 }
 894
 895 static gchar *exif_build_formatted_star_rating(ExifData *exif)
 896 {
 897         gint n = 0;
 898
 899         exif_get_integer(exif, "Xmp.xmp.Rating", &n);
 900
 901         return convert_rating_to_stars(n);
 902 }
 903
 904 /* List of custom formatted pseudo-exif tags */
 905 #define EXIF_FORMATTED_TAG(name, label) { EXIF_FORMATTED()#name, label, exif_build_formatted##_##name }
 906
 907 ExifFormattedText ExifFormattedList[] = {
 908         EXIF_FORMATTED_TAG(Camera,              N_("Camera")),
 909         EXIF_FORMATTED_TAG(DateTime,            N_("Date")),
 910         EXIF_FORMATTED_TAG(DateTimeDigitized,   N_("DateDigitized")),
 911         EXIF_FORMATTED_TAG(ShutterSpeed,        N_("Shutter speed")),
 912         EXIF_FORMATTED_TAG(Aperture,            N_("Aperture")),
 913         EXIF_FORMATTED_TAG(ExposureBias,        N_("Exposure bias")),
 914         EXIF_FORMATTED_TAG(ISOSpeedRating,      N_("ISO sensitivity")),
 915         EXIF_FORMATTED_TAG(FocalLength,         N_("Focal length")),
 916         EXIF_FORMATTED_TAG(FocalLength35mmFilm, N_("Focal length 35mm")),
 917         EXIF_FORMATTED_TAG(SubjectDistance,     N_("Subject distance")),
 918         EXIF_FORMATTED_TAG(Flash,               N_("Flash")),
 919         EXIF_FORMATTED_TAG(Resolution,          N_("Resolution")),
 920         EXIF_FORMATTED_TAG(ColorProfile,        N_("Color profile")),
 921         EXIF_FORMATTED_TAG(GPSPosition,         N_("GPS position")),
 922         EXIF_FORMATTED_TAG(GPSAltitude,         N_("GPS altitude")),
 923         EXIF_FORMATTED_TAG(localtime,           N_("Local time")),
 924         EXIF_FORMATTED_TAG(timezone,            N_("Time zone")),
 925         EXIF_FORMATTED_TAG(countryname,         N_("Country name")),
 926         EXIF_FORMATTED_TAG(countrycode,         N_("Country code")),
 927         EXIF_FORMATTED_TAG(star_rating,         N_("Star rating")),
 928         {"file.size",                           N_("File size"),        nullptr},
 929         {"file.date",                           N_("File date"),        nullptr},
 930         {"file.mode",                           N_("File mode"),        nullptr},
 931         {"file.ctime",                          N_("File ctime"),       nullptr},
 932         {"file.owner",                          N_("File owner"),       nullptr},
 933         {"file.group",                          N_("File group"),       nullptr},
 934         {"file.link",                           N_("File link"),        nullptr},
 935         {"file.class",                          N_("File class"),       nullptr},
 936         {"file.page_no",                        N_("Page no."),         nullptr},
 937         {"lua.lensID",                          N_("Lens"),             nullptr},
 938         { nullptr, nullptr, nullptr }
 939 };
 940
 941 gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gboolean *key_valid)
 942 {
 943         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0)
 944                 {
 945                 gint i;
 946
 947                 if (key_valid) *key_valid = TRUE;
 948
 949                 key += EXIF_FORMATTED_LEN;
 950                 for (i = 0; ExifFormattedList[i].key; i++)
 951                         if (ExifFormattedList[i].build_func && strcmp(key, ExifFormattedList[i].key + EXIF_FORMATTED_LEN) == 0)
 952                                 return ExifFormattedList[i].build_func(exif);
 953                 }
 954
 955         if (key_valid) *key_valid = FALSE;
 956         return nullptr;
 957 }
 958
 959 gchar *exif_get_description_by_key(const gchar *key)
 960 {
 961         if (!key) return nullptr;
 962
 963         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0 || strncmp(key, "file.", 5) == 0 || strncmp(key, "lua.", 4) == 0)
 964                 {
 965                 gint i;
 966
 967                 for (i = 0; ExifFormattedList[i].key; i++)
 968                         if (strcmp(key, ExifFormattedList[i].key) == 0)
 969                                 return g_strdup(_(ExifFormattedList[i].description));
 970                 }
 971
 972         return exif_get_tag_description_by_key(key);
 973 }
 974
 975 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
 976 {
 977         ExifItem *item;
 978
 979         item = exif_get_item(exif, key);
 980         return exif_item_get_integer(item, value);
 981 }
 982
 983 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
 984 {
 985         ExifItem *item;
 986
 987         item = exif_get_item(exif, key);
 988         return exif_item_get_rational(item, sign, 0);
 989 }
 990
 991 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
 992 {
 993         ExifItem *item;
 994         gchar *text;
 995         gboolean key_valid;
 996
 997         if (!key) return nullptr;
 998
 999         text = exif_get_formatted_by_key(exif, key, &key_valid);
1000         if (key_valid) return text;
1001
1002         item = exif_get_item(exif, key);
1003         if (item) return exif_item_get_data_as_text(item, exif);
1004
1005         return nullptr;
1006 }
1007
1008
1009 static FileCacheData *exif_cache;
1010
1011 void exif_release_cb(FileData *fd)
1012 {
1013         exif_free(fd->exif);
1014         fd->exif = nullptr;
1015 }
1016
1017 void exif_init_cache()
1018 {
1019         g_assert(!exif_cache);
1020         exif_cache = file_cache_new(exif_release_cb, 4);
1021 }
1022
1023 ExifData *exif_read_fd(FileData *fd)
1024 {
1025         gchar *sidecar_path;
1026
1027         if (!exif_cache) exif_init_cache();
1028
1029         if (!fd) return nullptr;
1030
1031         if (file_cache_get(exif_cache, fd)) return fd->exif;
1032         g_assert(fd->exif == nullptr);
1033
1034         /* CACHE_TYPE_XMP_METADATA file should exist only if the metadata are
1035          * not writable directly, thus it should contain the most up-to-date version */
1036         sidecar_path = nullptr;
1037
1038 #ifdef HAVE_EXIV2
1039         /* we are not able to handle XMP sidecars without exiv2 */
1040         sidecar_path = cache_find_location(CACHE_TYPE_XMP_METADATA, fd->path);
1041
1042         if (!sidecar_path) sidecar_path = file_data_get_sidecar_path(fd, TRUE);
1043 #endif
1044
1045         fd->exif = exif_read(fd->path, sidecar_path, fd->modified_xmp);
1046
1047         g_free(sidecar_path);
1048         file_cache_put(exif_cache, fd, 1);
1049         return fd->exif;
1050 }
1051
1052
1053 void exif_free_fd(FileData *fd, ExifData *exif)
1054 {
1055         if (!fd) return;
1056         g_assert(fd->exif == exif);
1057 }
1058
1059 /* embedded icc in jpeg */
1060
1061 gboolean exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
1062 {
1063         guint seg_offset = 0;
1064         guint seg_length = 0;
1065         guint chunk_offset[255];
1066         guint chunk_length[255];
1067         guint chunk_count = 0;
1068
1069         /* For jpeg/jfif, ICC color profile data can be in more than one segment.
1070            the data is in APP2 data segments that start with "ICC_PROFILE\x00\xNN\xTT"
1071            NN = segment number for data
1072            TT = total number of ICC segments (TT in each ICC segment should match)
1073          */
1074
1075         while (jpeg_segment_find(data + seg_offset + seg_length,
1076                                       size - seg_offset - seg_length,
1077                                       JPEG_MARKER_APP2,
1078                                       "ICC_PROFILE\x00", 12,
1079                                       &seg_offset, &seg_length))
1080                 {
1081                 guchar chunk_num;
1082                 guchar chunk_tot;
1083
1084                 if (seg_length < 14) return FALSE;
1085
1086                 chunk_num = data[seg_offset + 12];
1087                 chunk_tot = data[seg_offset + 13];
1088
1089                 if (chunk_num == 0 || chunk_tot == 0) return FALSE;
1090
1091                 if (chunk_count == 0)
1092                         {
1093                         guint i;
1094
1095                         chunk_count = static_cast<guint>(chunk_tot);
1096                         for (i = 0; i < chunk_count; i++) chunk_offset[i] = 0;
1097                         for (i = 0; i < chunk_count; i++) chunk_length[i] = 0;
1098                         }
1099
1100                 if (chunk_tot != chunk_count ||
1101                     chunk_num > chunk_count) return FALSE;
1102
1103                 chunk_num--;
1104                 chunk_offset[chunk_num] = seg_offset + 14;
1105                 chunk_length[chunk_num] = seg_length - 14;
1106                 }
1107
1108         if (chunk_count > 0)
1109                 {
1110                 guchar *cp_data;
1111                 guint cp_length = 0;
1112                 guint i;
1113
1114                 for (i = 0; i < chunk_count; i++) cp_length += chunk_length[i];
1115                 cp_data = static_cast<guchar *>(g_malloc(cp_length));
1116
1117                 for (i = 0; i < chunk_count; i++)
1118                         {
1119                         if (chunk_offset[i] == 0)
1120                                 {
1121                                 /* error, we never saw this chunk */
1122                                 g_free(cp_data);
1123                                 return FALSE;
1124                                 }
1125                         memcpy(cp_data, data + chunk_offset[i], chunk_length[i]);
1126                         }
1127                 DEBUG_1("Found embedded icc profile in jpeg");
1128                 exif_add_jpeg_color_profile(exif, cp_data, cp_length);
1129
1130                 return TRUE;
1131                 }
1132
1133         return FALSE;
1134 }
1135
1136 /*
1137  *-------------------------------------------------------------------
1138  * file info
1139  * it is here because it shares tag neming infrastructure with exif
1140  * we should probably not invest too much effort into this because
1141  * new exiv2 will support the same functionality
1142  * https://dev.exiv2.org/issues/505
1143  *-------------------------------------------------------------------
1144  */
1145
1146 static gchar *mode_number(mode_t m)
1147 {
1148         gint mb;
1149         gint mu;
1150         gint mg;
1151         gint mo;
1152         gchar pbuf[12];
1153
1154         mb = mu = mg = mo = 0;
1155
1156         if (m & S_ISUID) mb |= 4;
1157         if (m & S_ISGID) mb |= 2;
1158         if (m & S_ISVTX) mb |= 1;
1159
1160         if (m & S_IRUSR) mu |= 4;
1161         if (m & S_IWUSR) mu |= 2;
1162         if (m & S_IXUSR) mu |= 1;
1163
1164         if (m & S_IRGRP) mg |= 4;
1165         if (m & S_IWGRP) mg |= 2;
1166         if (m & S_IXGRP) mg |= 1;
1167
1168         if (m & S_IROTH) mo |= 4;
1169         if (m & S_IWOTH) mo |= 2;
1170         if (m & S_IXOTH) mo |= 1;
1171
1172         pbuf[0] = (m & S_IRUSR) ? 'r' : '-';
1173         pbuf[1] = (m & S_IWUSR) ? 'w' : '-';
1174         pbuf[2] = (m & S_IXUSR) ? 'x' : '-';
1175         pbuf[3] = (m & S_IRGRP) ? 'r' : '-';
1176         pbuf[4] = (m & S_IWGRP) ? 'w' : '-';
1177         pbuf[5] = (m & S_IXGRP) ? 'x' : '-';
1178         pbuf[6] = (m & S_IROTH) ? 'r' : '-';
1179         pbuf[7] = (m & S_IWOTH) ? 'w' : '-';
1180         pbuf[8] = (m & S_IXOTH) ? 'x' : '-';
1181         pbuf[9] = '\0';
1182
1183         return g_strdup_printf("%s (%d%d%d%d)", pbuf, mb, mu, mg, mo);
1184 }
1185
1186 gchar *metadata_file_info(FileData *fd, const gchar *key, MetadataFormat)
1187 {
1188         gchar *page_n_of_m;
1189
1190         if (strcmp(key, "file.size") == 0)
1191                 {
1192                 return g_strdup_printf("%ld", static_cast<long>(fd->size));
1193                 }
1194         if (strcmp(key, "file.date") == 0)
1195                 {
1196                 return g_strdup(text_from_time(fd->date));
1197                 }
1198         if (strcmp(key, "file.mode") == 0)
1199                 {
1200                 return mode_number(fd->mode);
1201                 }
1202         if (strcmp(key, "file.ctime") == 0)
1203                 {
1204                 return g_strdup(text_from_time(fd->cdate));
1205                 }
1206         if (strcmp(key, "file.class") == 0)
1207                 {
1208                 return g_strdup(format_class_list[fd->format_class]);
1209                 }
1210         if (strcmp(key, "file.owner") == 0)
1211                 {
1212                 return g_strdup(fd->owner);
1213                 }
1214         if (strcmp(key, "file.group") == 0)
1215                 {
1216                 return g_strdup(fd->group);
1217                 }
1218         if (strcmp(key, "file.link") == 0)
1219                 {
1220                 return g_strdup(fd->sym_link);
1221                 }
1222         if (strcmp(key, "file.page_no") == 0)
1223                 {
1224                 if (fd->page_total > 1)
1225                         {
1226                         page_n_of_m = g_strdup_printf("[%d/%d]", fd->page_num + 1, fd->page_total);
1227                         return page_n_of_m;
1228                         }
1229
1230                 return nullptr;
1231                 }
1232         return g_strdup("");
1233 }
1234
1235 #ifdef HAVE_LUA
1236 gchar *metadata_lua_info(FileData *fd, const gchar *key, MetadataFormat)
1237 {
1238         gchar *script_name;
1239         gchar *script_name_utf8;
1240         gchar *data;
1241         gchar *raw_data;
1242         gchar *valid_data;
1243
1244         script_name_utf8 = g_strdup(key + 4);
1245         script_name = path_from_utf8(script_name_utf8);
1246
1247         raw_data = lua_callvalue(fd, script_name, nullptr);
1248         valid_data = g_utf8_make_valid(raw_data, -1);
1249         data = g_utf8_substring(valid_data, 0, 150);
1250
1251         g_free(script_name);
1252         g_free(script_name_utf8);
1253         g_free(raw_data);
1254         g_free(valid_data);
1255
1256         return data;
1257 }
1258 #endif
1259 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */