src/exif-common.c

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