src/exif-common.cc

   1 /*
   2  * Copyright (C) 2006 John Ellis
   3  * Copyright (C) 2008 - 2016 The Geeqie Team
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #include <config.h>
  21
  22 #ifdef __linux__
  23 #define _XOPEN_SOURCE
  24 #endif
  25
  26 #include <sys/stat.h>
  27
  28 #include <cmath>
  29 #include <cstdlib>
  30 #include <cstring>
  31 #include <ctime>
  32
  33 #include <glib.h>
  34
  35 #if HAVE_LCMS
  36 /*** color support enabled ***/
  37 #  if HAVE_LCMS2
  38 #    include <lcms2.h>
  39 #  else
  40 #    include <lcms.h>
  41 #  endif
  42 #endif
  43
  44 #include "cache.h"
  45 #include "debug.h"
  46 #include "exif.h"
  47 #include "filecache.h"
  48 #include "filedata.h"
  49 #include "glua.h"
  50 #include "intl.h"
  51 #include "jpeg-parser.h"
  52 #include "main-defines.h"
  53 #include "misc.h"
  54 #include "third-party/zonedetect.h"
  55 #include "typedefs.h"
  56 #include "ui-fileops.h"
  57 struct ExifData;
  58 struct ExifItem;
  59 struct FileCacheData;
  60 struct ZoneDetect;
  61
  62
  63 static gdouble exif_rational_to_double(ExifRational *r, gint sign)
  64 {
  65         if (!r || r->den == 0.0) return 0.0;
  66
  67         if (sign) return static_cast<gdouble>(static_cast<gint>(r->num)) / static_cast<gdouble>(static_cast<gint>(r->den));
  68         return static_cast<gdouble>(r->num) / r->den;
  69 }
  70
  71 static gdouble exif_get_rational_as_double(ExifData *exif, const gchar *key)
  72 {
  73         ExifRational *r;
  74         gint sign;
  75
  76         r = exif_get_rational(exif, key, &sign);
  77         return exif_rational_to_double(r, sign);
  78 }
  79
  80 static GString *append_comma_text(GString *string, const gchar *text)
  81 {
  82         string = g_string_append(string, ", ");
  83         string = g_string_append(string, text);
  84
  85         return string;
  86 }
  87
  88 static gchar *remove_common_prefix(gchar *s, gchar *t)
  89 {
  90         gint i;
  91
  92         if (!s || !t) return t;
  93
  94         for (i = 0; s[i] && t[i] && s[i] == t[i]; i++)
  95                 ;
  96         if (!i)
  97                 return t;
  98         if (s[i-1] == ' ' || !s[i])
  99                 {
 100                 while (t[i] == ' ')
 101                         i++;
 102                 return t + i;
 103                 }
 104         return s;
 105 }
 106
 107 static gdouble get_crop_factor(ExifData *exif)
 108 {
 109         gdouble res_unit_tbl[] = {0.0, 25.4, 25.4, 10.0, 1.0, 0.001 };
 110         gdouble xres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneXResolution");
 111         gdouble yres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneYResolution");
 112         gint res_unit;
 113         gint w;
 114         gint h;
 115         gdouble xsize;
 116         gdouble ysize;
 117         gdouble size;
 118         gdouble ratio;
 119
 120         if (xres == 0.0 || yres == 0.0) return 0.0;
 121
 122         if (!exif_get_integer(exif, "Exif.Photo.FocalPlaneResolutionUnit", &res_unit)) return 0.0;
 123         if (res_unit < 1 || res_unit > 5) return 0.0;
 124
 125         if (!exif_get_integer(exif, "Exif.Photo.PixelXDimension", &w)) return 0.0;
 126         if (!exif_get_integer(exif, "Exif.Photo.PixelYDimension", &h)) return 0.0;
 127
 128         xsize = w * res_unit_tbl[res_unit] / xres;
 129         ysize = h * res_unit_tbl[res_unit] / yres;
 130
 131         ratio = xsize / ysize;
 132
 133         if (ratio < 0.5 || ratio > 2.0) return 0.0; /* reasonable ratio */
 134
 135         size = hypot(xsize, ysize);
 136
 137         if (size < 1.0 || size > 100.0) return 0.0; /* reasonable sensor size in mm */
 138
 139         return hypot(36, 24) / size;
 140 }
 141
 142 static gboolean remove_suffix(gchar *str, const gchar *suffix, gint suffix_len)
 143 {
 144         gint str_len = strlen(str);
 145
 146         if (suffix_len < 0) suffix_len = strlen(suffix);
 147         if (str_len < suffix_len) return FALSE;
 148
 149         if (strcmp(str + str_len - suffix_len, suffix) != 0) return FALSE;
 150         str[str_len - suffix_len] = '\0';
 151
 152         return TRUE;
 153 }
 154
 155 static gchar *exif_build_formatted_Camera(ExifData *exif)
 156 {
 157         gchar *text;
 158         gchar *make = exif_get_data_as_text(exif, "Exif.Image.Make");
 159         gchar *model = exif_get_data_as_text(exif, "Exif.Image.Model");
 160         gchar *software = exif_get_data_as_text(exif, "Exif.Image.Software");
 161         gchar *model2;
 162         gchar *software2;
 163
 164         if (make)
 165                 {
 166                 g_strstrip(make);
 167
 168                 if (remove_suffix(make, " CORPORATION", 12)) { /* Nikon */ }
 169                 else if (remove_suffix(make, " Corporation", 12)) { /* Pentax */ }
 170                 else if (remove_suffix(make, " OPTICAL CO.,LTD", 16)) { /* OLYMPUS */ };
 171                 }
 172
 173         if (model)
 174                 g_strstrip(model);
 175
 176         if (software)
 177                 {
 178                 gint i;
 179                 gint j;
 180
 181                 g_strstrip(software);
 182
 183                 /* remove superfluous spaces (pentax K100D) */
 184                 for (i = 0, j = 0; software[i]; i++, j++)
 185                         {
 186                         if (software[i] == ' ' && software[i + 1] == ' ')
 187                                 i++;
 188                         if (i != j) software[j] = software[i];
 189                         }
 190                 software[j] = '\0';
 191                 }
 192
 193         model2 = remove_common_prefix(make, model);
 194         software2 = remove_common_prefix(model2, software);
 195
 196         text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", (make && model2) ? " " : "",
 197                                                (model2) ? model2 : "",
 198                                                (software2 && (make || model2)) ? " (" : "",
 199                                                (software2) ? software2 : "",
 200                                                (software2 && (make || model2)) ? ")" : "");
 201
 202         g_free(make);
 203         g_free(model);
 204         g_free(software);
 205         return text;
 206 }
 207
 208 static gchar *exif_build_formatted_DateTime(ExifData *exif)
 209 {
 210         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeOriginal");
 211         gchar *subsec = nullptr;
 212         gchar buf[128];
 213         gchar *tmp;
 214         gint buflen;
 215         struct tm tm;
 216         GError *error = nullptr;
 217
 218         if (text)
 219                 {
 220                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeOriginal");
 221                 }
 222         else
 223                 {
 224                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 225                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 226                 }
 227
 228         /* Convert the stuff into a tm struct */
 229         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 230         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 231                 {
 232                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 233                 if (buflen > 0)
 234                         {
 235                         tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 236                         if (error)
 237                                 {
 238                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 239                                 g_error_free(error);
 240                                 }
 241                         else
 242                                 {
 243                                 g_free(text);
 244                                 text = g_strdup(tmp);
 245                                 }
 246                         }
 247                 }
 248
 249         if (subsec)
 250                 {
 251                 tmp = text;
 252                 text = g_strconcat(tmp, ".", subsec, NULL);
 253                 g_free(tmp);
 254                 g_free(subsec);
 255                 }
 256         return text;
 257 }
 258
 259 static gchar *exif_build_formatted_DateTimeDigitized(ExifData *exif)
 260 {
 261         gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeDigitized");
 262         gchar *subsec = nullptr;
 263         gchar buf[128];
 264         gchar *tmp;
 265         gint buflen;
 266         struct tm tm;
 267         GError *error = nullptr;
 268
 269         if (text)
 270                 {
 271                 subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeDigitized");
 272                 }
 273         else
 274                 {
 275                 text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 276                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 277                 }
 278
 279         /* Convert the stuff into a tm struct */
 280         memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
 281         if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
 282                 {
 283                 buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
 284                 if (buflen > 0)
 285                         {
 286                         tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 287                         if (error)
 288                                 {
 289                                 log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 290                                 g_error_free(error);
 291                                 }
 292                         else
 293                                 {
 294                                 g_free(text);
 295                                 text = g_strdup(tmp);
 296                                 }
 297                         }
 298                 }
 299
 300         if (subsec)
 301                 {
 302                 tmp = text;
 303                 text = g_strconcat(tmp, ".", subsec, NULL);
 304                 g_free(tmp);
 305                 g_free(subsec);
 306                 }
 307         return text;
 308 }
 309
 310 static gchar *exif_build_formatted_ShutterSpeed(ExifData *exif)
 311 {
 312         ExifRational *r;
 313
 314         r = exif_get_rational(exif, "Exif.Photo.ExposureTime", nullptr);
 315         if (r && r->num && r->den)
 316                 {
 317                 gdouble n = static_cast<gdouble>(r->den) / static_cast<gdouble>(r->num);
 318                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 319                                                   n > 1.0 ? n : 1.0 / n);
 320                 }
 321         r = exif_get_rational(exif, "Exif.Photo.ShutterSpeedValue", nullptr);
 322         if (r && r->num  && r->den)
 323                 {
 324                 gdouble n = pow(2.0, exif_rational_to_double(r, TRUE));
 325
 326                 /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
 327                 if (n > 1.0 && static_cast<gint>(n) - (static_cast<gint>(n/10))*10 == 1) n--;
 328
 329                 return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 330                                                   n > 1.0 ? floor(n) : 1.0 / n);
 331                 }
 332         return nullptr;
 333 }
 334
 335 static gchar *exif_build_formatted_Aperture(ExifData *exif)
 336 {
 337         gdouble n;
 338
 339         n = exif_get_rational_as_double(exif, "Exif.Photo.FNumber");
 340         if (n == 0.0) n = exif_get_rational_as_double(exif, "Exif.Photo.ApertureValue");
 341         if (n == 0.0) return nullptr;
 342
 343         return g_strdup_printf("f/%.1f", n);
 344 }
 345
 346 static gchar *exif_build_formatted_ExposureBias(ExifData *exif)
 347 {
 348         ExifRational *r;
 349         gint sign;
 350         gdouble n;
 351
 352         r = exif_get_rational(exif, "Exif.Photo.ExposureBiasValue", &sign);
 353         if (!r) return nullptr;
 354
 355         n = exif_rational_to_double(r, sign);
 356         return g_strdup_printf("%+.1f", n);
 357 }
 358
 359 static gchar *exif_build_formatted_FocalLength(ExifData *exif)
 360 {
 361         gdouble n;
 362
 363         n = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 364         if (n == 0.0) return nullptr;
 365         return g_strdup_printf("%.0f mm", n);
 366 }
 367
 368 static gchar *exif_build_formatted_FocalLength35mmFilm(ExifData *exif)
 369 {
 370         gint n;
 371         gdouble f;
 372         gdouble c;
 373
 374         if (exif_get_integer(exif, "Exif.Photo.FocalLengthIn35mmFilm", &n) && n != 0)
 375                 {
 376                 return g_strdup_printf("%d mm", n);
 377                 }
 378
 379         f = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 380         if (f == 0.0) return nullptr;
 381
 382         c = get_crop_factor(exif);
 383         if (c == 0.0) return nullptr;
 384
 385         return g_strdup_printf("%.0f mm", f * c);
 386 }
 387
 388 static gchar *exif_build_formatted_ISOSpeedRating(ExifData *exif)
 389 {
 390         gchar *text;
 391
 392         text = exif_get_data_as_text(exif, "Exif.Photo.ISOSpeedRatings");
 393         /* old canon may set this instead */
 394         if (!text) text = exif_get_data_as_text(exif, "Exif.CanonSi.ISOSpeed");
 395         /* kodak may set this instead */
 396         if (!text) text = exif_get_data_as_text(exif, "Exif.Photo.ExposureIndex");
 397         return text;
 398 }
 399
 400 static gchar *exif_build_formatted_SubjectDistance(ExifData *exif)
 401 {
 402         ExifRational *r;
 403         gint sign;
 404         gdouble n;
 405
 406         r = exif_get_rational(exif, "Exif.Photo.SubjectDistance", &sign);
 407         if (!r) return nullptr;
 408
 409         if (static_cast<glong>(r->num) == static_cast<glong>(0xffffffff)) return g_strdup(_("infinity"));
 410         if (static_cast<glong>(r->num) == 0) return g_strdup(_("unknown"));
 411
 412         n = exif_rational_to_double(r, sign);
 413         if (n == 0.0) return _("unknown");
 414         return g_strdup_printf("%.3f m", n);
 415 }
 416
 417 static gchar *exif_build_formatted_Flash(ExifData *exif)
 418 {
 419         /* grr, flash is a bitmask... */
 420         GString *string;
 421         gint n;
 422         gint v;
 423
 424         if (!exif_get_integer(exif, "Exif.Photo.Flash", &n)) return nullptr;
 425
 426         /* Exif 2.1 only defines first 3 bits */
 427         if (n <= 0x07) return exif_get_data_as_text(exif, "Exif.Photo.Flash");
 428
 429         /* must be Exif 2.2 */
 430         string = g_string_new("");
 431
 432         /* flash fired (bit 0) */
 433         string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
 434
 435         /* flash mode (bits 3, 4) */
 436         v = (n >> 3) & 0x03;
 437         if (v) string = append_comma_text(string, _("mode:"));
 438         switch (v)
 439                 {
 440                 case 1:
 441                         string = g_string_append(string, _("on"));
 442                         break;
 443                 case 2:
 444                         string = g_string_append(string, _("off"));
 445                         break;
 446                 case 3:
 447                         string = g_string_append(string, _("auto"));
 448                         break;
 449                 }
 450
 451         /* return light (bits 1, 2) */
 452         v = (n >> 1) & 0x03;
 453         if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
 454         if (v == 3) string = append_comma_text(string, _("detected by strobe"));
 455
 456         /* we ignore flash function (bit 5) */
 457
 458         /* red-eye (bit 6) */
 459         if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
 460
 461         return g_string_free(string, FALSE);
 462 }
 463
 464 static gchar *exif_build_formatted_Resolution(ExifData *exif)
 465 {
 466         ExifRational *rx;
 467         ExifRational *ry;
 468         gchar *units;
 469         gchar *text;
 470
 471         rx = exif_get_rational(exif, "Exif.Image.XResolution", nullptr);
 472         ry = exif_get_rational(exif, "Exif.Image.YResolution", nullptr);
 473         if (!rx || !ry) return nullptr;
 474
 475         units = exif_get_data_as_text(exif, "Exif.Image.ResolutionUnit");
 476         text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? static_cast<gdouble>(rx->num) / rx->den : 1.0,
 477                                                       ry->den ? static_cast<gdouble>(ry->num) / ry->den : 1.0,
 478                                                       _("dot"), (units) ? units : _("unknown"));
 479
 480         g_free(units);
 481         return text;
 482 }
 483
 484 static gchar *exif_build_formatted_ColorProfile(ExifData *exif)
 485 {
 486 #if HAVE_LCMS2
 487         cmsUInt8Number profileID[17];
 488 #endif
 489         const gchar *name = "";
 490         const gchar *source = "";
 491         guchar *profile_data;
 492         guint profile_len;
 493
 494         profile_data = exif_get_color_profile(exif, &profile_len);
 495         if (!profile_data)
 496                 {
 497                 gint cs;
 498                 gchar *interop_index;
 499
 500                 /* ColorSpace == 1 specifies sRGB per EXIF 2.2 */
 501                 if (!exif_get_integer(exif, "Exif.Photo.ColorSpace", &cs)) cs = 0;
 502                 interop_index = exif_get_data_as_text(exif, "Exif.Iop.InteroperabilityIndex");
 503
 504                 if (cs == 1)
 505                         {
 506                         name = _("sRGB");
 507                         source = "ColorSpace";
 508                         }
 509                 else if (cs == 2 || (interop_index && !strcmp(interop_index, "R03")))
 510                         {
 511                         name = _("AdobeRGB");
 512                         source = (cs == 2) ? "ColorSpace" : "Iop";
 513                         }
 514
 515                 g_free(interop_index);
 516                 }
 517         else
 518                 {
 519                 source = _("embedded");
 520 #if HAVE_LCMS
 521
 522                         {
 523                         cmsHPROFILE profile;
 524
 525                         profile = cmsOpenProfileFromMem(profile_data, profile_len);
 526                         if (profile)
 527                                 {
 528 #if HAVE_LCMS2
 529                                 profileID[16] = '\0';
 530                                 cmsGetHeaderProfileID(profile, profileID);
 531                                 name = reinterpret_cast<gchar *>(profileID);
 532 #else
 533                                 name = (gchar *) cmsTakeProductName(profile);
 534 #endif
 535                                 cmsCloseProfile(profile);
 536                                 }
 537                         g_free(profile_data);
 538                         }
 539 #endif
 540                 }
 541         if (name[0] == 0 && source[0] == 0) return nullptr;
 542         return g_strdup_printf("%s (%s)", name, source);
 543 }
 544
 545 static gchar *exif_build_formatted_GPSPosition(ExifData *exif)
 546 {
 547         GString *string;
 548         gchar *ref;
 549         ExifRational *value;
 550         ExifItem *item;
 551         guint i;
 552         gdouble p;
 553         gdouble p3;
 554         gulong p1;
 555         gulong p2;
 556
 557         string = g_string_new("");
 558
 559         item = exif_get_item(exif, "Exif.GPSInfo.GPSLatitude");
 560         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 561         if (item && ref)
 562                 {
 563                 p = 0;
 564                 for (i = 0; i < exif_item_get_elements(item); i++)
 565                         {
 566                         value = exif_item_get_rational(item, nullptr, i);
 567                         if (value && value->num && value->den)
 568                                 p += static_cast<gdouble>(value->num) / static_cast<gdouble>(value->den) / pow(60.0, static_cast<gdouble>(i));
 569                         }
 570                 p1 = static_cast<gint>(p);
 571                 p2 = static_cast<gint>((p - p1)*60);
 572                 p3 = ((p - p1)*60 - p2)*60;
 573
 574                 g_string_append_printf(string, "%0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 575                 } // if (item && ref)
 576
 577         item = exif_get_item(exif, "Exif.GPSInfo.GPSLongitude");
 578         ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 579         if (item && ref)
 580                 {
 581                 p = 0;
 582                 for (i = 0; i < exif_item_get_elements(item); i++)
 583                         {
 584                         value = exif_item_get_rational(item, nullptr, i);
 585                         if (value && value->num && value->den)
 586                         p += static_cast<gdouble>(value->num) / static_cast<gdouble>(value->den) / pow(60.0, static_cast<gdouble>(i));
 587                         }
 588                 p1 = static_cast<gint>(p);
 589                 p2 = static_cast<gint>((p - p1)*60);
 590                 p3 = ((p - p1)*60 - p2)*60;
 591
 592                 g_string_append_printf(string, ", %0lu° %0lu' %0.2f\" %.1s", p1, p2, p3, ref);
 593                 } // if (item && ref)
 594
 595         return g_string_free(string, FALSE);
 596 } // static gchar *exif_build_forma...
 597
 598 static gchar *exif_build_formatted_GPSAltitude(ExifData *exif)
 599 {
 600         ExifRational *r;
 601         ExifItem *item;
 602         gdouble alt;
 603         gint ref;
 604
 605         item = exif_get_item(exif, "Exif.GPSInfo.GPSAltitudeRef");
 606         r = exif_get_rational(exif, "Exif.GPSInfo.GPSAltitude", nullptr);
 607
 608         if (!r || !item) return nullptr;
 609
 610         alt = exif_rational_to_double(r, 0);
 611         exif_item_get_integer(item, &ref);
 612
 613         return g_strdup_printf("%0.f m %s", alt, (ref==0)?_("Above Sea Level"):_("Below Sea Level"));
 614 }
 615
 616 /**
 617  * @brief Extracts timezone data from a ZoneDetect search structure
 618  * @param[in] results ZoneDetect search structure
 619  * @param[out] timezone in the form "Europe/London"
 620  * @param[out] countryname in the form "United Kingdom"
 621  * @param[out] countryalpha2 in the form "GB"
 622  *
 623  * Refer to https://github.com/BertoldVdb/ZoneDetect
 624  * for structure details
 625  */
 626 static void zd_tz(ZoneDetectResult *results, gchar **timezone, gchar **countryname, gchar **countryalpha2)
 627 {
 628         gchar *timezone_pre = nullptr;
 629         gchar *timezone_id = nullptr;
 630         unsigned int index = 0;
 631
 632         while(results[index].lookupResult != ZD_LOOKUP_END)
 633                 {
 634                 if(results[index].data)
 635                         {
 636                         for(unsigned int i=0; i<results[index].numFields; i++)
 637                                 {
 638                                 if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneIdPrefix"))
 639                                         {
 640                                         timezone_pre = g_strdup(results[index].data[i]);
 641                                         }
 642                                 if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneId"))
 643                                         {
 644                                         timezone_id = g_strdup(results[index].data[i]);
 645                                         }
 646                                 if (g_strstr_len(results[index].fieldNames[i], -1, "CountryName"))
 647                                         {
 648                                         *countryname = g_strdup(results[index].data[i]);
 649                                         }
 650                                 if (g_strstr_len(results[index].fieldNames[i], -1, "CountryAlpha2"))
 651                                         {
 652                                         *countryalpha2 = g_strdup(results[index].data[i]);
 653                                         }
 654                                 }
 655                         }
 656                 index++;
 657                 }
 658
 659         *timezone = g_strconcat(timezone_pre, timezone_id, NULL);
 660         g_free(timezone_pre);
 661         g_free(timezone_id);
 662 }
 663
 664 void ZoneDetect_onError(int errZD, int errNative)
 665 {
 666         log_printf("Error: ZoneDetect %s (0x%08X)\n", ZDGetErrorString(errZD), (unsigned)errNative);
 667 }
 668
 669 /**
 670  * @brief Gets timezone data from an exif structure
 671  * @param[in] exif
 672  * @returns TRUE if timezone data found AND GPS date and time found
 673  * @param[out] exif_date_time exif date/time in the form 2018:11:30:17:05:04
 674  * @param[out] timezone in the form "Europe/London"
 675  * @param[out] countryname in the form "United Kingdom"
 676  * @param[out] countryalpha2 in the form "GB"
 677  *
 678  *
 679  */
 680 static gboolean exif_build_tz_data(ExifData *exif, gchar **exif_date_time, gchar **timezone, gchar **countryname, gchar **countryalpha2)
 681 {
 682         gfloat latitude;
 683         gfloat longitude;
 684         gchar *text_latitude;
 685         gchar *text_longitude;
 686         gchar *text_latitude_ref;
 687         gchar *text_longitude_ref;
 688         gchar *text_date;
 689         gchar *text_time;
 690         gchar *lat_deg;
 691         gchar *lat_min;
 692         gchar *lon_deg;
 693         gchar *lon_min;
 694         gchar *timezone_path;
 695         ZoneDetect *cd;
 696         ZoneDetectResult *results;
 697         gboolean ret = FALSE;
 698
 699         text_latitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitude");
 700         text_longitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitude");
 701         text_latitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
 702         text_longitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
 703         text_date = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSDateStamp");
 704         text_time = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSTimeStamp");
 705
 706         if (text_latitude && text_longitude && text_latitude_ref && text_longitude_ref)
 707                 {
 708                 lat_deg = strtok(text_latitude, "deg'");
 709                 lat_min = strtok(nullptr, "deg'");
 710                 if (!lat_deg || !lat_min)
 711                         {
 712                         return FALSE;
 713                         }
 714                 latitude = atof(lat_deg) + atof(lat_min) / 60;
 715                 if (!g_strcmp0(text_latitude_ref, "South"))
 716                         {
 717                         latitude = -latitude;
 718                         }
 719                 lon_deg = strtok(text_longitude, "deg'");
 720                 lon_min = strtok(nullptr, "deg'");
 721                 if (!lon_deg || !lon_min)
 722                         {
 723                         return FALSE;
 724                         }
 725                 longitude = atof(lon_deg) + atof(lon_min) / 60;
 726                 if (!g_strcmp0(text_longitude_ref, "West"))
 727                         {
 728                         longitude = -longitude;
 729                         }
 730
 731                 timezone_path = g_build_filename(get_rc_dir(), TIMEZONE_DATABASE_FILE, NULL);
 732                 if (g_file_test(timezone_path, G_FILE_TEST_EXISTS))
 733                         {
 734                         ZDSetErrorHandler(ZoneDetect_onError);
 735                         cd = ZDOpenDatabase(timezone_path);
 736                         if (cd)
 737                                 {
 738                                 results = ZDLookup(cd, latitude, longitude, nullptr);
 739                                 if (results)
 740                                         {
 741                                         zd_tz(results, timezone, countryname, countryalpha2);
 742                                         ret = TRUE;
 743                                         }
 744                                 }
 745                         else
 746                                 {
 747                                 log_printf("Error: Init of timezone database %s failed\n", timezone_path);
 748                                 }
 749                         ZDCloseDatabase(cd);
 750                         }
 751                 g_free(timezone_path);
 752                 }
 753
 754         if (ret && text_date && text_time)
 755                 {
 756                 *exif_date_time = g_strconcat(text_date, ":", text_time, NULL);
 757                 }
 758         else
 759                 {
 760                 ret = FALSE;
 761                 }
 762         return ret;
 763 }
 764
 765 /**
 766  * @brief Creates local time from GPS lat/long
 767  * @param[in] exif
 768  * @returns Localised time and date
 769  *
 770  * GPS lat/long is translated to timezone using ZoneDetect.
 771  * GPS UTC is converted to Unix time stamp (seconds since 1970).
 772  * The TZ environment variable is set to the relevant timezone
 773  * and the Unix timestamp converted to local time using locale.
 774  * If the conversion fails, unformatted UTC is returned.
 775  */
 776 static gchar *exif_build_formatted_localtime(ExifData *exif)
 777 {
 778         gchar buf[128];
 779         gchar *tmp;
 780         gint buflen;
 781         GError *error = nullptr;
 782         gchar *time_zone_image;
 783         gchar *time_zone_org;
 784         struct tm *tm_local;
 785         struct tm tm_utc;
 786         time_t stamp;
 787         gchar *exif_date_time = nullptr;
 788         gchar *timezone = nullptr;
 789         gchar *countryname = nullptr;
 790         gchar *countryalpha2 = nullptr;
 791
 792         if (exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2))
 793                 {
 794                 time_zone_image = g_strconcat("TZ=", timezone, NULL);
 795                 time_zone_org = g_strconcat("TZ=", getenv("TZ"), NULL);
 796                 setenv("TZ", "UTC", TRUE);
 797
 798                 memset(&tm_utc, 0, sizeof(tm_utc));
 799                 if (exif_date_time && strptime(exif_date_time, "%Y:%m:%d:%H:%M:%S", &tm_utc))
 800                         {
 801                         stamp = mktime(&tm_utc);        // Convert the struct to a Unix timestamp
 802                         putenv(time_zone_image);        // Switch to destination time zone
 803
 804                         tm_local = localtime(&stamp);
 805
 806                         /* Convert to localtime using locale */
 807                         buflen = strftime(buf, sizeof(buf), "%x %X", tm_local);
 808                         if (buflen > 0)
 809                                 {
 810                                 tmp = g_locale_to_utf8(buf, buflen, nullptr, nullptr, &error);
 811                                 if (error)
 812                                         {
 813                                         log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
 814                                         g_error_free(error);
 815                                         }
 816                                 else
 817                                         {
 818                                         g_free(exif_date_time);
 819                                         exif_date_time = tmp;
 820                                         }
 821                                 }
 822                         }
 823                 putenv(time_zone_org);
 824
 825                 g_free(time_zone_image);
 826                 g_free(time_zone_org);
 827                 }
 828
 829         g_free(timezone);
 830         g_free(countryname);
 831         g_free(countryalpha2);
 832
 833         return exif_date_time;
 834 }
 835
 836 /**
 837  * @brief Gets timezone from GPS lat/long
 838  * @param[in] exif
 839  * @returns Timezone string in the form "Europe/London"
 840  *
 841  *
 842  */
 843 static gchar *exif_build_formatted_timezone(ExifData *exif)
 844 {
 845         gchar *exif_date_time = nullptr;
 846         gchar *timezone = nullptr;
 847         gchar *countryname = nullptr;
 848         gchar *countryalpha2 = nullptr;
 849
 850         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 851
 852         g_free(exif_date_time);
 853         g_free(countryname);
 854         g_free(countryalpha2);
 855
 856         return timezone;
 857 }
 858
 859 /**
 860  * @brief Gets countryname from GPS lat/long
 861  * @param[in] exif
 862  * @returns Countryname string
 863  *
 864  *
 865  */
 866 static gchar *exif_build_formatted_countryname(ExifData *exif)
 867 {
 868         gchar *exif_date_time = nullptr;
 869         gchar *timezone = nullptr;
 870         gchar *countryname = nullptr;
 871         gchar *countryalpha2 = nullptr;
 872
 873         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 874
 875         g_free(exif_date_time);
 876         g_free(timezone);
 877         g_free(countryalpha2);
 878
 879         return countryname;
 880 }
 881
 882 /**
 883  * @brief Gets two-letter country code from GPS lat/long
 884  * @param[in] exif
 885  * @returns Countryalpha2 string
 886  *
 887  *
 888  */
 889 static gchar *exif_build_formatted_countrycode(ExifData *exif)
 890 {
 891         gchar *exif_date_time = nullptr;
 892         gchar *timezone = nullptr;
 893         gchar *countryname = nullptr;
 894         gchar *countryalpha2 = nullptr;
 895
 896         exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
 897
 898         g_free(exif_date_time);
 899         g_free(timezone);
 900         g_free(countryname);
 901
 902         return countryalpha2;
 903 }
 904
 905 static gchar *exif_build_formatted_star_rating(ExifData *exif)
 906 {
 907         gint n = 0;
 908
 909         exif_get_integer(exif, "Xmp.xmp.Rating", &n);
 910
 911         return convert_rating_to_stars(n);
 912 }
 913
 914 /* List of custom formatted pseudo-exif tags */
 915 #define EXIF_FORMATTED_TAG(name, label) { EXIF_FORMATTED()#name, label, exif_build_formatted##_##name }
 916
 917 ExifFormattedText ExifFormattedList[] = {
 918         EXIF_FORMATTED_TAG(Camera,              N_("Camera")),
 919         EXIF_FORMATTED_TAG(DateTime,            N_("Date")),
 920         EXIF_FORMATTED_TAG(DateTimeDigitized,   N_("DateDigitized")),
 921         EXIF_FORMATTED_TAG(ShutterSpeed,        N_("Shutter speed")),
 922         EXIF_FORMATTED_TAG(Aperture,            N_("Aperture")),
 923         EXIF_FORMATTED_TAG(ExposureBias,        N_("Exposure bias")),
 924         EXIF_FORMATTED_TAG(ISOSpeedRating,      N_("ISO sensitivity")),
 925         EXIF_FORMATTED_TAG(FocalLength,         N_("Focal length")),
 926         EXIF_FORMATTED_TAG(FocalLength35mmFilm, N_("Focal length 35mm")),
 927         EXIF_FORMATTED_TAG(SubjectDistance,     N_("Subject distance")),
 928         EXIF_FORMATTED_TAG(Flash,               N_("Flash")),
 929         EXIF_FORMATTED_TAG(Resolution,          N_("Resolution")),
 930         EXIF_FORMATTED_TAG(ColorProfile,        N_("Color profile")),
 931         EXIF_FORMATTED_TAG(GPSPosition,         N_("GPS position")),
 932         EXIF_FORMATTED_TAG(GPSAltitude,         N_("GPS altitude")),
 933         EXIF_FORMATTED_TAG(localtime,           N_("Local time")),
 934         EXIF_FORMATTED_TAG(timezone,            N_("Time zone")),
 935         EXIF_FORMATTED_TAG(countryname,         N_("Country name")),
 936         EXIF_FORMATTED_TAG(countrycode,         N_("Country code")),
 937         EXIF_FORMATTED_TAG(star_rating,         N_("Star rating")),
 938         {"file.size",                           N_("File size"),        nullptr},
 939         {"file.date",                           N_("File date"),        nullptr},
 940         {"file.mode",                           N_("File mode"),        nullptr},
 941         {"file.ctime",                          N_("File ctime"),       nullptr},
 942         {"file.owner",                          N_("File owner"),       nullptr},
 943         {"file.group",                          N_("File group"),       nullptr},
 944         {"file.link",                           N_("File link"),        nullptr},
 945         {"file.class",                          N_("File class"),       nullptr},
 946         {"file.page_no",                        N_("Page no."),         nullptr},
 947         {"lua.lensID",                          N_("Lens"),             nullptr},
 948         { nullptr, nullptr, nullptr }
 949 };
 950
 951 gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gboolean *key_valid)
 952 {
 953         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0)
 954                 {
 955                 gint i;
 956
 957                 if (key_valid) *key_valid = TRUE;
 958
 959                 key += EXIF_FORMATTED_LEN;
 960                 for (i = 0; ExifFormattedList[i].key; i++)
 961                         if (ExifFormattedList[i].build_func && strcmp(key, ExifFormattedList[i].key + EXIF_FORMATTED_LEN) == 0)
 962                                 return ExifFormattedList[i].build_func(exif);
 963                 }
 964
 965         if (key_valid) *key_valid = FALSE;
 966         return nullptr;
 967 }
 968
 969 gchar *exif_get_description_by_key(const gchar *key)
 970 {
 971         if (!key) return nullptr;
 972
 973         if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0 || strncmp(key, "file.", 5) == 0 || strncmp(key, "lua.", 4) == 0)
 974                 {
 975                 gint i;
 976
 977                 for (i = 0; ExifFormattedList[i].key; i++)
 978                         if (strcmp(key, ExifFormattedList[i].key) == 0)
 979                                 return g_strdup(_(ExifFormattedList[i].description));
 980                 }
 981
 982         return exif_get_tag_description_by_key(key);
 983 }
 984
 985 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
 986 {
 987         ExifItem *item;
 988
 989         item = exif_get_item(exif, key);
 990         return exif_item_get_integer(item, value);
 991 }
 992
 993 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
 994 {
 995         ExifItem *item;
 996
 997         item = exif_get_item(exif, key);
 998         return exif_item_get_rational(item, sign, 0);
 999 }
1000
1001 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
1002 {
1003         ExifItem *item;
1004         gchar *text;
1005         gboolean key_valid;
1006
1007         if (!key) return nullptr;
1008
1009         text = exif_get_formatted_by_key(exif, key, &key_valid);
1010         if (key_valid) return text;
1011
1012         item = exif_get_item(exif, key);
1013         if (item) return exif_item_get_data_as_text(item, exif);
1014
1015         return nullptr;
1016 }
1017
1018
1019 static FileCacheData *exif_cache;
1020
1021 void exif_release_cb(FileData *fd)
1022 {
1023         exif_free(fd->exif);
1024         fd->exif = nullptr;
1025 }
1026
1027 void exif_init_cache()
1028 {
1029         g_assert(!exif_cache);
1030         exif_cache = file_cache_new(exif_release_cb, 4);
1031 }
1032
1033 ExifData *exif_read_fd(FileData *fd)
1034 {
1035         gchar *sidecar_path;
1036
1037         if (!exif_cache) exif_init_cache();
1038
1039         if (!fd) return nullptr;
1040
1041         if (file_cache_get(exif_cache, fd)) return fd->exif;
1042         g_assert(fd->exif == nullptr);
1043
1044         /* CACHE_TYPE_XMP_METADATA file should exist only if the metadata are
1045          * not writable directly, thus it should contain the most up-to-date version */
1046         sidecar_path = nullptr;
1047
1048 #if HAVE_EXIV2
1049         /* we are not able to handle XMP sidecars without exiv2 */
1050         sidecar_path = cache_find_location(CACHE_TYPE_XMP_METADATA, fd->path);
1051
1052         if (!sidecar_path) sidecar_path = file_data_get_sidecar_path(fd, TRUE);
1053 #endif
1054
1055         fd->exif = exif_read(fd->path, sidecar_path, fd->modified_xmp);
1056
1057         g_free(sidecar_path);
1058         file_cache_put(exif_cache, fd, 1);
1059         return fd->exif;
1060 }
1061
1062
1063 void exif_free_fd(FileData *fd, ExifData *exif)
1064 {
1065         if (!fd) return;
1066         g_assert(fd->exif == exif);
1067 }
1068
1069 /* embedded icc in jpeg */
1070
1071 gboolean exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
1072 {
1073         guint seg_offset = 0;
1074         guint seg_length = 0;
1075         guint chunk_offset[255];
1076         guint chunk_length[255];
1077         guint chunk_count = 0;
1078
1079         /* For jpeg/jfif, ICC color profile data can be in more than one segment.
1080            the data is in APP2 data segments that start with "ICC_PROFILE\x00\xNN\xTT"
1081            NN = segment number for data
1082            TT = total number of ICC segments (TT in each ICC segment should match)
1083          */
1084
1085         while (jpeg_segment_find(data + seg_offset + seg_length,
1086                                       size - seg_offset - seg_length,
1087                                       JPEG_MARKER_APP2,
1088                                       "ICC_PROFILE\x00", 12,
1089                                       &seg_offset, &seg_length))
1090                 {
1091                 guchar chunk_num;
1092                 guchar chunk_tot;
1093
1094                 if (seg_length < 14) return FALSE;
1095
1096                 chunk_num = data[seg_offset + 12];
1097                 chunk_tot = data[seg_offset + 13];
1098
1099                 if (chunk_num == 0 || chunk_tot == 0) return FALSE;
1100
1101                 if (chunk_count == 0)
1102                         {
1103                         guint i;
1104
1105                         chunk_count = static_cast<guint>(chunk_tot);
1106                         for (i = 0; i < chunk_count; i++) chunk_offset[i] = 0;
1107                         for (i = 0; i < chunk_count; i++) chunk_length[i] = 0;
1108                         }
1109
1110                 if (chunk_tot != chunk_count ||
1111                     chunk_num > chunk_count) return FALSE;
1112
1113                 chunk_num--;
1114                 chunk_offset[chunk_num] = seg_offset + 14;
1115                 chunk_length[chunk_num] = seg_length - 14;
1116                 }
1117
1118         if (chunk_count > 0)
1119                 {
1120                 guchar *cp_data;
1121                 guint cp_length = 0;
1122                 guint i;
1123
1124                 for (i = 0; i < chunk_count; i++) cp_length += chunk_length[i];
1125                 cp_data = static_cast<guchar *>(g_malloc(cp_length));
1126
1127                 for (i = 0; i < chunk_count; i++)
1128                         {
1129                         if (chunk_offset[i] == 0)
1130                                 {
1131                                 /* error, we never saw this chunk */
1132                                 g_free(cp_data);
1133                                 return FALSE;
1134                                 }
1135                         memcpy(cp_data, data + chunk_offset[i], chunk_length[i]);
1136                         }
1137                 DEBUG_1("Found embedded icc profile in jpeg");
1138                 exif_add_jpeg_color_profile(exif, cp_data, cp_length);
1139
1140                 return TRUE;
1141                 }
1142
1143         return FALSE;
1144 }
1145
1146 /*
1147  *-------------------------------------------------------------------
1148  * file info
1149  * it is here because it shares tag neming infrastructure with exif
1150  * we should probably not invest too much effort into this because
1151  * new exiv2 will support the same functionality
1152  * https://dev.exiv2.org/issues/505
1153  *-------------------------------------------------------------------
1154  */
1155
1156 static gchar *mode_number(mode_t m)
1157 {
1158         gint mb;
1159         gint mu;
1160         gint mg;
1161         gint mo;
1162         gchar pbuf[12];
1163
1164         mb = mu = mg = mo = 0;
1165
1166         if (m & S_ISUID) mb |= 4;
1167         if (m & S_ISGID) mb |= 2;
1168         if (m & S_ISVTX) mb |= 1;
1169
1170         if (m & S_IRUSR) mu |= 4;
1171         if (m & S_IWUSR) mu |= 2;
1172         if (m & S_IXUSR) mu |= 1;
1173
1174         if (m & S_IRGRP) mg |= 4;
1175         if (m & S_IWGRP) mg |= 2;
1176         if (m & S_IXGRP) mg |= 1;
1177
1178         if (m & S_IROTH) mo |= 4;
1179         if (m & S_IWOTH) mo |= 2;
1180         if (m & S_IXOTH) mo |= 1;
1181
1182         pbuf[0] = (m & S_IRUSR) ? 'r' : '-';
1183         pbuf[1] = (m & S_IWUSR) ? 'w' : '-';
1184         pbuf[2] = (m & S_IXUSR) ? 'x' : '-';
1185         pbuf[3] = (m & S_IRGRP) ? 'r' : '-';
1186         pbuf[4] = (m & S_IWGRP) ? 'w' : '-';
1187         pbuf[5] = (m & S_IXGRP) ? 'x' : '-';
1188         pbuf[6] = (m & S_IROTH) ? 'r' : '-';
1189         pbuf[7] = (m & S_IWOTH) ? 'w' : '-';
1190         pbuf[8] = (m & S_IXOTH) ? 'x' : '-';
1191         pbuf[9] = '\0';
1192
1193         return g_strdup_printf("%s (%d%d%d%d)", pbuf, mb, mu, mg, mo);
1194 }
1195
1196 gchar *metadata_file_info(FileData *fd, const gchar *key, MetadataFormat)
1197 {
1198         gchar *page_n_of_m;
1199
1200         if (strcmp(key, "file.size") == 0)
1201                 {
1202                 return g_strdup_printf("%ld", static_cast<long>(fd->size));
1203                 }
1204         if (strcmp(key, "file.date") == 0)
1205                 {
1206                 return g_strdup(text_from_time(fd->date));
1207                 }
1208         if (strcmp(key, "file.mode") == 0)
1209                 {
1210                 return mode_number(fd->mode);
1211                 }
1212         if (strcmp(key, "file.ctime") == 0)
1213                 {
1214                 return g_strdup(text_from_time(fd->cdate));
1215                 }
1216         if (strcmp(key, "file.class") == 0)
1217                 {
1218                 return g_strdup(format_class_list[fd->format_class]);
1219                 }
1220         if (strcmp(key, "file.owner") == 0)
1221                 {
1222                 return g_strdup(fd->owner);
1223                 }
1224         if (strcmp(key, "file.group") == 0)
1225                 {
1226                 return g_strdup(fd->group);
1227                 }
1228         if (strcmp(key, "file.link") == 0)
1229                 {
1230                 return g_strdup(fd->sym_link);
1231                 }
1232         if (strcmp(key, "file.page_no") == 0)
1233                 {
1234                 if (fd->page_total > 1)
1235                         {
1236                         page_n_of_m = g_strdup_printf("[%d/%d]", fd->page_num + 1, fd->page_total);
1237                         return page_n_of_m;
1238                         }
1239
1240                 return nullptr;
1241                 }
1242         return g_strdup("");
1243 }
1244
1245 #if HAVE_LUA
1246 gchar *metadata_lua_info(FileData *fd, const gchar *key, MetadataFormat)
1247 {
1248         gchar *script_name;
1249         gchar *script_name_utf8;
1250         gchar *data;
1251         gchar *raw_data;
1252         gchar *valid_data;
1253
1254         script_name_utf8 = g_strdup(key + 4);
1255         script_name = path_from_utf8(script_name_utf8);
1256
1257         raw_data = lua_callvalue(fd, script_name, nullptr);
1258         valid_data = g_utf8_make_valid(raw_data, -1);
1259         data = g_utf8_substring(valid_data, 0, 150);
1260
1261         g_free(script_name);
1262         g_free(script_name_utf8);
1263         g_free(raw_data);
1264         g_free(valid_data);
1265
1266         return data;
1267 }
1268 #endif
1269 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */