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