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