#include "ui_fileops.h"
#include "cache.h"
#include "jpeg_parser.h"
+#include "zonedetect.h"
static gdouble exif_rational_to_double(ExifRational *r, gint sign)
return g_strdup_printf("%0.f m %s", alt, (ref==0)?_("Above Sea Level"):_("Below Sea Level"));
}
+/**
+ * @brief Extracts timezone from a ZoneDetect search structure
+ * @param results ZoneDetect search structure
+ * @returns Timezone in the form "Europe/London"
+ *
+ * Refer to https://github.com/BertoldVdb/ZoneDetect
+ * for structure details
+ */
+static gchar *zd_tz(ZoneDetectResult* results)
+{
+ gchar *timezone = NULL;
+ gchar *timezone_pre = NULL;
+ gchar *timezone_id = NULL;
+ unsigned int index = 0;
+
+ if (!results)
+ {
+ return NULL;
+ }
+
+ while(results[index].lookupResult != ZD_LOOKUP_END)
+ {
+ if(results[index].data)
+ {
+ for(unsigned int i=0; i<results[index].numFields; i++)
+ {
+ if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneIdPrefix"))
+ {
+ timezone_pre = g_strdup(results[index].data[i]);
+ }
+ if (g_strstr_len(results[index].fieldNames[i], -1, "TimezoneId"))
+ {
+ timezone_id = g_strdup(results[index].data[i]);
+ }
+ }
+ }
+ index++;
+ }
+
+ timezone = g_strconcat(timezone_pre, timezone_id, NULL);
+ g_free(timezone_pre);
+ g_free(timezone_id);
+ return timezone;
+}
+
+/**
+ * @brief Creates local time from GPS lat/long
+ * @param exif
+ * @returns Localised time and date
+ *
+ * GPS lat/long is translated to timezone using ZoneDetect.
+ * GPS UTC is converted to Unix time stamp (seconds since 1970).
+ * The TZ environment variable is set to the relevant timezone
+ * and the Unix timestamp converted to local time using locale.
+ * If the conversion fails, unformatted UTC is returned.
+ */
+static gchar *exif_build_formatted_localtime(ExifData *exif)
+{
+ gfloat latitude;
+ gfloat longitude;
+ gchar *text_latitude;
+ gchar *text_longitude;
+ gchar *text_latitude_ref;
+ gchar *text_longitude_ref;
+ gchar *text_date;
+ gchar *text_time;
+ gchar *text_date_time = NULL;
+ gchar buf[128];
+ gchar *tmp;
+ gint buflen;
+ GError *error = NULL;
+ gchar *lat_deg;
+ gchar *lat_min;
+ gchar *lon_deg;
+ gchar *lon_min;
+ gchar *time_zone;
+ gchar *time_zone_org;
+ struct tm *tm_local;
+ struct tm tm_utc;
+ time_t stamp;
+ gchar *zd_path;
+ gchar *zone_selected;
+ ZoneDetect *cd;
+ ZoneDetectResult *results;
+
+ text_latitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitude");
+ text_longitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitude");
+ text_latitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
+ text_longitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
+ text_date = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSDateStamp");
+ text_time = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSTimeStamp");
+
+ if (text_latitude && text_longitude && text_latitude_ref &&
+ text_longitude_ref && text_date && text_time)
+ {
+ text_date_time = g_strconcat(text_date, ":", text_time, NULL);
+
+ lat_deg = strtok(text_latitude, "deg'");
+ lat_min = strtok(NULL, "deg'");
+ latitude = atof(lat_deg) + atof(lat_min) / 60;
+ if (!g_strcmp0(text_latitude_ref, "South"))
+ {
+ latitude = -latitude;
+ }
+ lon_deg = strtok(text_longitude, "deg'");
+ lon_min = strtok(NULL, "deg'");
+ longitude = atof(lon_deg) + atof(lon_min) / 60;
+ if (!g_strcmp0(text_longitude_ref, "West"))
+ {
+ longitude = -longitude;
+ }
+
+ zd_path = g_build_filename(GQ_BIN_DIR, TIMEZONE_DATABASE, NULL);
+ cd = ZDOpenDatabase(zd_path);
+ if (cd)
+ {
+ results = ZDLookup(cd, latitude, longitude, NULL);
+ zone_selected = zd_tz(results);
+ time_zone = g_strconcat("TZ=", zone_selected, NULL);
+ time_zone_org = g_strconcat("TZ=", getenv("TZ"), NULL);
+ putenv("TZ=UTC");
+ g_free(zone_selected);
+
+ memset(&tm_utc, 0, sizeof(tm_utc));
+ if (text_date_time && strptime(text_date_time, "%Y:%m:%d:%H:%M:%S", &tm_utc))
+ {
+ stamp = mktime(&tm_utc); // Convert the struct to a Unix timestamp
+ putenv(time_zone); // Switch to destination time zone
+
+ tm_local = localtime(&stamp);
+
+ /* Convert to localtime using locale */
+ buflen = strftime(buf, sizeof(buf), "%x %X", tm_local);
+ if (buflen > 0)
+ {
+ tmp = g_locale_to_utf8(buf, buflen, NULL, NULL, &error);
+ if (error)
+ {
+ log_printf("Error converting locale strftime to UTF-8: %s\n", error->message);
+ g_error_free(error);
+ }
+ else
+ {
+ g_free(text_date_time);
+ text_date_time = g_strdup(tmp);
+ }
+ }
+ g_free(tmp);
+ }
+ putenv(time_zone_org);
+
+ g_free(time_zone);
+ g_free(time_zone_org);
+ }
+ else
+ {
+ log_printf("Error: Init of timezone database %s failed\n", zd_path);
+ }
+ ZDCloseDatabase(cd);
+ g_free(zd_path);
+ }
+
+ g_free(text_latitude);
+ g_free(text_longitude);
+ g_free(text_latitude_ref);
+ g_free(text_longitude_ref);
+ g_free(text_date);
+ g_free(text_time);
+
+ return text_date_time;
+}
+
+/**
+ * @brief Gets timezone from GPS lat/long
+ * @param exif
+ * @returns Timezone string in the form "Europe/London"
+ *
+ *
+ */
+static gchar *exif_build_formatted_timezone(ExifData *exif)
+{
+ gfloat latitude;
+ gfloat longitude;
+ gchar *text_latitude;
+ gchar *text_longitude;
+ gchar *text_latitude_ref;
+ gchar *text_longitude_ref;
+ gchar *lat_deg;
+ gchar *lat_min;
+ gchar *lon_deg;
+ gchar *lon_min;
+ gchar *time_zone = NULL;
+ gchar *zd_path;
+ ZoneDetect *cd;
+ ZoneDetectResult *results;
+
+ text_latitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitude");
+ text_longitude = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitude");
+ text_latitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLatitudeRef");
+ text_longitude_ref = exif_get_data_as_text(exif, "Exif.GPSInfo.GPSLongitudeRef");
+
+ if (text_latitude && text_longitude && text_latitude_ref &&
+ text_longitude_ref)
+ {
+ lat_deg = strtok(text_latitude, "deg'");
+ lat_min = strtok(NULL, "deg'");
+ latitude = atof(lat_deg) + atof(lat_min) / 60;
+ if (g_strcmp0(text_latitude_ref, "South") == 0)
+ {
+ latitude = -latitude;
+ }
+ lon_deg = strtok(text_longitude, "deg'");
+ lon_min = strtok(NULL, "deg'");
+ longitude = atof(lon_deg) + atof(lon_min) / 60;
+ if (g_strcmp0(text_longitude_ref, "West") == 0)
+ {
+ longitude = -longitude;
+ }
+ zd_path = g_build_filename(GQ_BIN_DIR, TIMEZONE_DATABASE, NULL);
+ cd = ZDOpenDatabase(zd_path);
+ if (cd)
+ {
+ results = ZDLookup(cd, latitude, longitude, NULL);
+ time_zone = zd_tz(results);
+ ZDFreeResults(results);
+ }
+ else
+ {
+ log_printf("Error: Init of timezone database %s failed\n", zd_path);
+ }
+ ZDCloseDatabase(cd);
+ g_free(zd_path);
+ }
+
+ g_free(text_latitude);
+ g_free(text_longitude);
+ g_free(text_latitude_ref);
+ g_free(text_longitude_ref);
+
+ return time_zone;
+}
/* List of custom formatted pseudo-exif tags */
#define EXIF_FORMATTED_TAG(name, label) { EXIF_FORMATTED()#name, label, exif_build_formatted##_##name }
EXIF_FORMATTED_TAG(ColorProfile, N_("Color profile")),
EXIF_FORMATTED_TAG(GPSPosition, N_("GPS position")),
EXIF_FORMATTED_TAG(GPSAltitude, N_("GPS altitude")),
+ EXIF_FORMATTED_TAG(localtime, N_("Local time")),
+ EXIF_FORMATTED_TAG(timezone, N_("Time zone")),
{"file.size", N_("File size"), NULL},
{"file.date", N_("File date"), NULL},
{"file.mode", N_("File mode"), NULL},
projects / geeqie.git / blobdiff