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