Include a Other Software section in Help file
[geeqie.git] / src / exif-common.c
index b54f939..833a86c 100644 (file)
@@ -1,14 +1,28 @@
 /*
- * Geeqie
- * (C) 2006 John Ellis
- * Copyright (C) 2008 The Geeqie Team
+ * Copyright (C) 2006 John Ellis
+ * Copyright (C) 2008 - 2016 The Geeqie Team
  *
-*/
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
 
 #ifdef HAVE_CONFIG_H
 #  include "config.h"
 #endif
 
+#define _XOPEN_SOURCE
+
 #include <stdio.h>
 #include <string.h>
 #include <fcntl.h>
 #ifdef HAVE_LCMS
 /*** color support enabled ***/
 
-#ifdef HAVE_LCMS_LCMS_H
-  #include <lcms/lcms.h>
+#ifdef HAVE_LCMS2
+#include <lcms2.h>
 #else
-  #include <lcms.h>
+#include <lcms.h>
 #endif
 #endif
 
 #include "filefilter.h"
 #include "filecache.h"
 #include "format_raw.h"
+#include "glua.h"
 #include "ui_fileops.h"
+#include "cache.h"
+#include "jpeg_parser.h"
+#include "misc.h"
+#include "zonedetect.h"
 
 
 static gdouble exif_rational_to_double(ExifRational *r, gint sign)
@@ -118,16 +137,16 @@ static gdouble get_crop_factor(ExifData *exif)
 
 }
 
-static gint remove_suffix(gchar *str, const gchar *suffix, gint suffix_len)
+static gboolean remove_suffix(gchar *str, const gchar *suffix, gint suffix_len)
 {
        gint str_len = strlen(str);
-       
+
        if (suffix_len < 0) suffix_len = strlen(suffix);
        if (str_len < suffix_len) return FALSE;
-       
+
        if (strcmp(str + str_len - suffix_len, suffix) != 0) return FALSE;
        str[str_len - suffix_len] = '\0';
-       
+
        return TRUE;
 }
 
@@ -157,7 +176,7 @@ static gchar *exif_build_formatted_Camera(ExifData *exif)
                gint i, j;
 
                g_strstrip(software);
-               
+
                /* remove superfluous spaces (pentax K100D) */
                for (i = 0, j = 0; software[i]; i++, j++)
                        {
@@ -187,16 +206,97 @@ static gchar *exif_build_formatted_DateTime(ExifData *exif)
 {
        gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeOriginal");
        gchar *subsec = NULL;
+       gchar buf[128];
+       gchar *tmp;
+       gint buflen;
+       struct tm tm;
+       GError *error = NULL;
+
+       if (text)
+               {
+               subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeOriginal");
+               }
+       else
+               {
+               text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
+               if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
+               }
+
+       /* Convert the stuff into a tm struct */
+       memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
+       if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
+               {
+               buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
+               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);
+                               text = g_strdup(tmp);
+                               }
+                       }
+               }
+
+       if (subsec)
+               {
+               tmp = text;
+               text = g_strconcat(tmp, ".", subsec, NULL);
+               g_free(tmp);
+               g_free(subsec);
+               }
+       return text;
+}
+
+static gchar *exif_build_formatted_DateTimeDigitized(ExifData *exif)
+{
+       gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeDigitized");
+       gchar *subsec = NULL;
+       gchar buf[128];
+       gchar *tmp;
+       gint buflen;
+       struct tm tm;
+       GError *error = NULL;
 
-       if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeOriginal");
-       if (!text)
+       if (text)
+               {
+               subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeDigitized");
+               }
+       else
                {
                text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
                if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
                }
+
+       /* Convert the stuff into a tm struct */
+       memset(&tm, 0, sizeof(tm)); /* Uh, strptime could let garbage in tm! */
+       if (text && strptime(text, "%Y:%m:%d %H:%M:%S", &tm))
+               {
+               buflen = strftime(buf, sizeof(buf), "%x %X", &tm);
+               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);
+                               text = g_strdup(tmp);
+                               }
+                       }
+               }
+
        if (subsec)
                {
-               gchar *tmp = text;
+               tmp = text;
                text = g_strconcat(tmp, ".", subsec, NULL);
                g_free(tmp);
                g_free(subsec);
@@ -286,6 +386,8 @@ static gchar *exif_build_formatted_ISOSpeedRating(ExifData *exif)
        gchar *text;
 
        text = exif_get_data_as_text(exif, "Exif.Photo.ISOSpeedRatings");
+       /* old canon may set this instead */
+       if (!text) text = exif_get_data_as_text(exif, "Exif.CanonSi.ISOSpeed");
        /* kodak may set this instead */
        if (!text) text = exif_get_data_as_text(exif, "Exif.Photo.ExposureIndex");
        return text;
@@ -379,6 +481,9 @@ static gchar *exif_build_formatted_Resolution(ExifData *exif)
 
 static gchar *exif_build_formatted_ColorProfile(ExifData *exif)
 {
+#ifdef HAVE_LCMS2
+       cmsUInt8Number profileID[17];
+#endif
        const gchar *name = "";
        const gchar *source = "";
        guchar *profile_data;
@@ -418,7 +523,13 @@ static gchar *exif_build_formatted_ColorProfile(ExifData *exif)
                        profile = cmsOpenProfileFromMem(profile_data, profile_len);
                        if (profile)
                                {
-                               name = cmsTakeProductName(profile);
+#ifdef HAVE_LCMS2
+                               profileID[16] = '\0';
+                               cmsGetHeaderProfileID(profile, profileID);
+                               name = (gchar *) profileID;
+#else
+                               name = (gchar *) cmsTakeProductName(profile);
+#endif
                                cmsCloseProfile(profile);
                                }
                        g_free(profile_data);
@@ -501,6 +612,303 @@ static gchar *exif_build_formatted_GPSAltitude(ExifData *exif)
        return g_strdup_printf("%0.f m %s", alt, (ref==0)?_("Above Sea Level"):_("Below Sea Level"));
 }
 
+/**
+ * @brief Extracts timezone data from a ZoneDetect search structure
+ * @param[in] results ZoneDetect search structure
+ * @param[out] timezone in the form "Europe/London"
+ * @param[out] countryname in the form "United Kingdom"
+ * @param[out] countryalpha2 in the form "GB"
+ * 
+ * Refer to https://github.com/BertoldVdb/ZoneDetect
+ * for structure details
+ */
+static void zd_tz(ZoneDetectResult *results, gchar **timezone, gchar **countryname, gchar **countryalpha2)
+{
+       gchar *timezone_pre = NULL;
+       gchar *timezone_id = NULL;
+       unsigned int index = 0;
+
+       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]);
+                                       }
+                               if (g_strstr_len(results[index].fieldNames[i], -1, "CountryName"))
+                                       {
+                                       *countryname = g_strdup(results[index].data[i]);
+                                       }
+                               if (g_strstr_len(results[index].fieldNames[i], -1, "CountryAlpha2"))
+                                       {
+                                       *countryalpha2 = g_strdup(results[index].data[i]);
+                                       }
+                               }
+                       }
+               index++;
+               }
+
+       *timezone = g_strconcat(timezone_pre, timezone_id, NULL);
+       g_free(timezone_pre);
+       g_free(timezone_id);
+}
+
+/**
+ * @brief Gets timezone data from an exif structure
+ * @param[in] exif
+ * @returns TRUE if timezone data found AND GPS date and time found
+ * @param[out] exif_date_time exif date/time in the form 2018:11:30:17:05:04
+ * @param[out] timezone in the form "Europe/London"
+ * @param[out] countryname in the form "United Kingdom"
+ * @param[out] countryalpha2 in the form "GB"
+ *
+ *
+ */
+static gboolean exif_build_tz_data(ExifData *exif, gchar **exif_date_time, gchar **timezone, gchar **countryname, gchar **countryalpha2)
+{
+       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 *lat_deg;
+       gchar *lat_min;
+       gchar *lon_deg;
+       gchar *lon_min;
+       gchar *timezone_path;
+       ZoneDetect *cd;
+       ZoneDetectResult *results;
+       gboolean ret = FALSE;
+       gchar *basename;
+       gchar *path;
+
+       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)
+               {
+               lat_deg = strtok(text_latitude, "deg'");
+               lat_min = strtok(NULL, "deg'");
+               if (!lat_deg || !lat_min)
+                       {
+                       return FALSE;
+                       }
+               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'");
+               if (!lon_deg || !lon_min)
+                       {
+                       return FALSE;
+                       }
+               longitude = atof(lon_deg) + atof(lon_min) / 60;
+               if (!g_strcmp0(text_longitude_ref, "West"))
+                       {
+                       longitude = -longitude;
+                       }
+
+               path = path_from_utf8(TIMEZONE_DATABASE);
+               basename = g_path_get_basename(path);
+               timezone_path = g_build_filename(get_rc_dir(), basename, NULL);
+               if (g_file_test(timezone_path, G_FILE_TEST_EXISTS))
+                       {
+                       cd = ZDOpenDatabase(timezone_path);
+                       if (cd)
+                               {
+                               results = ZDLookup(cd, latitude, longitude, NULL);
+                               if (results)
+                                       {
+                                       zd_tz(results, timezone, countryname, countryalpha2);
+                                       ret = TRUE;
+                                       }
+                               }
+                       else
+                               {
+                               log_printf("Error: Init of timezone database %s failed\n", timezone_path);
+                               }
+                       ZDCloseDatabase(cd);
+                       }
+               g_free(path);
+               g_free(timezone_path);
+               g_free(basename);
+               }
+
+       if (ret && text_date && text_time)
+               {
+               *exif_date_time = g_strconcat(text_date, ":", text_time, NULL);
+               }
+       else
+               {
+               ret = FALSE;
+               }
+       return ret;
+}
+
+/**
+ * @brief Creates local time from GPS lat/long
+ * @param[in] 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)
+{
+       gchar buf[128];
+       gchar *tmp;
+       gint buflen;
+       GError *error = NULL;
+       gchar *time_zone_image;
+       gchar *time_zone_org;
+       struct tm *tm_local;
+       struct tm tm_utc;
+       time_t stamp;
+       gchar *exif_date_time = NULL;
+       gchar *timezone = NULL;
+       gchar *countryname = NULL;
+       gchar *countryalpha2 = NULL;
+
+       if (exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2))
+               {
+               time_zone_image = g_strconcat("TZ=", timezone, NULL);
+               time_zone_org = g_strconcat("TZ=", getenv("TZ"), NULL);
+               putenv("TZ=UTC");
+
+               memset(&tm_utc, 0, sizeof(tm_utc));
+               if (exif_date_time && strptime(exif_date_time, "%Y:%m:%d:%H:%M:%S", &tm_utc))
+                       {
+                       stamp = mktime(&tm_utc);        // Convert the struct to a Unix timestamp
+                       putenv(time_zone_image);        // 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(exif_date_time);
+                                       exif_date_time = tmp;
+                                       }
+                               }
+                       }
+               putenv(time_zone_org);
+
+               g_free(time_zone_image);
+               g_free(time_zone_org);
+               }
+
+       g_free(timezone);
+       g_free(countryname);
+       g_free(countryalpha2);
+
+       return exif_date_time;
+}
+
+/**
+ * @brief Gets timezone from GPS lat/long
+ * @param[in] exif
+ * @returns Timezone string in the form "Europe/London"
+ *
+ *
+ */
+static gchar *exif_build_formatted_timezone(ExifData *exif)
+{
+       gchar *exif_date_time = NULL;
+       gchar *timezone = NULL;
+       gchar *countryname = NULL;
+       gchar *countryalpha2 = NULL;
+
+       exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
+
+       g_free(exif_date_time);
+       g_free(countryname);
+       g_free(countryalpha2);
+
+       return timezone;
+}
+
+/**
+ * @brief Gets countryname from GPS lat/long
+ * @param[in] exif
+ * @returns Countryname string
+ *
+ *
+ */
+static gchar *exif_build_formatted_countryname(ExifData *exif)
+{
+       gchar *exif_date_time = NULL;
+       gchar *timezone = NULL;
+       gchar *countryname = NULL;
+       gchar *countryalpha2 = NULL;
+
+       exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
+
+       g_free(exif_date_time);
+       g_free(timezone);
+       g_free(countryalpha2);
+
+       return countryname;
+}
+
+/**
+ * @brief Gets two-letter country code from GPS lat/long
+ * @param[in] exif
+ * @returns Countryalpha2 string
+ *
+ *
+ */
+static gchar *exif_build_formatted_countrycode(ExifData *exif)
+{
+       gchar *exif_date_time = NULL;
+       gchar *timezone = NULL;
+       gchar *countryname = NULL;
+       gchar *countryalpha2 = NULL;
+
+       exif_build_tz_data(exif, &exif_date_time, &timezone, &countryname, &countryalpha2);
+
+       g_free(exif_date_time);
+       g_free(timezone);
+       g_free(countryname);
+
+       return countryalpha2;
+}
+
+static gchar *exif_build_formatted_star_rating(ExifData *exif)
+{
+       gint n = 0;
+
+       exif_get_integer(exif, "Xmp.xmp.Rating", &n);
+
+       return convert_rating_to_stars(n);
+}
 
 /* List of custom formatted pseudo-exif tags */
 #define EXIF_FORMATTED_TAG(name, label) { EXIF_FORMATTED()#name, label, exif_build_formatted##_##name }
@@ -508,6 +916,7 @@ static gchar *exif_build_formatted_GPSAltitude(ExifData *exif)
 ExifFormattedText ExifFormattedList[] = {
        EXIF_FORMATTED_TAG(Camera,              N_("Camera")),
        EXIF_FORMATTED_TAG(DateTime,            N_("Date")),
+       EXIF_FORMATTED_TAG(DateTimeDigitized,   N_("DateDigitized")),
        EXIF_FORMATTED_TAG(ShutterSpeed,        N_("Shutter speed")),
        EXIF_FORMATTED_TAG(Aperture,            N_("Aperture")),
        EXIF_FORMATTED_TAG(ExposureBias,        N_("Exposure bias")),
@@ -520,10 +929,25 @@ ExifFormattedText ExifFormattedList[] = {
        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")),
+       EXIF_FORMATTED_TAG(countryname,         N_("Country name")),
+       EXIF_FORMATTED_TAG(countrycode,         N_("Country code")),
+       EXIF_FORMATTED_TAG(star_rating,         N_("Star rating")),
+       {"file.size",                           N_("File size"),        NULL},
+       {"file.date",                           N_("File date"),        NULL},
+       {"file.mode",                           N_("File mode"),        NULL},
+       {"file.ctime",                          N_("File ctime"),       NULL},
+       {"file.owner",                          N_("File owner"),       NULL},
+       {"file.group",                          N_("File group"),       NULL},
+       {"file.link",                           N_("File link"),        NULL},
+       {"file.class",                          N_("File class"),       NULL},
+       {"file.page_no",                        N_("Page no."),         NULL},
+       {"lua.lensID",                          N_("Lens"),             NULL},
        { NULL, NULL, NULL }
 };
 
-gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gint *key_valid)
+gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gboolean *key_valid)
 {
        if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0)
                {
@@ -533,7 +957,7 @@ gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gint *key_val
 
                key += EXIF_FORMATTED_LEN;
                for (i = 0; ExifFormattedList[i].key; i++)
-                       if (strcmp(key, ExifFormattedList[i].key + EXIF_FORMATTED_LEN) == 0)
+                       if (ExifFormattedList[i].build_func && strcmp(key, ExifFormattedList[i].key + EXIF_FORMATTED_LEN) == 0)
                                return ExifFormattedList[i].build_func(exif);
                }
 
@@ -545,13 +969,12 @@ gchar *exif_get_description_by_key(const gchar *key)
 {
        if (!key) return NULL;
 
-       if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0)
+       if (strncmp(key, EXIF_FORMATTED(), EXIF_FORMATTED_LEN) == 0 || strncmp(key, "file.", 5) == 0 || strncmp(key, "lua.", 4) == 0)
                {
                gint i;
 
-               key += EXIF_FORMATTED_LEN;
                for (i = 0; ExifFormattedList[i].key; i++)
-                       if (strcmp(key, ExifFormattedList[i].key + EXIF_FORMATTED_LEN) == 0)
+                       if (strcmp(key, ExifFormattedList[i].key) == 0)
                                return g_strdup(_(ExifFormattedList[i].description));
                }
 
@@ -578,7 +1001,7 @@ gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
 {
        ExifItem *item;
        gchar *text;
-       gint key_valid;
+       gboolean key_valid;
 
        if (!key) return NULL;
 
@@ -600,121 +1023,51 @@ void exif_release_cb(FileData *fd)
        fd->exif = NULL;
 }
 
+void exif_init_cache(void)
+{
+       g_assert(!exif_cache);
+       exif_cache = file_cache_new(exif_release_cb, 4);
+}
+
 ExifData *exif_read_fd(FileData *fd)
 {
-       gchar *sidecar_path = NULL;
+       gchar *sidecar_path;
+
+       if (!exif_cache) exif_init_cache();
 
        if (!fd) return NULL;
-       
-       if (!exif_cache) exif_cache = file_cache_new(exif_release_cb, 4);
-       
+
        if (file_cache_get(exif_cache, fd)) return fd->exif;
+       g_assert(fd->exif == NULL);
 
-       if (filter_file_class(fd->extension, FORMAT_CLASS_RAWIMAGE))
-               {
-               GList *work;
-               
-               work = fd->parent ? fd->parent->sidecar_files : fd->sidecar_files;
-               while (work)
-                       {
-                       FileData *sfd = work->data;
-                       work = work->next;
-                       if (strcasecmp(sfd->extension, ".xmp") == 0)
-                               {
-                               sidecar_path = sfd->path;
-                               break;
-                               }
-                       }
-               }
+       /* CACHE_TYPE_XMP_METADATA file should exist only if the metadata are
+        * not writable directly, thus it should contain the most up-to-date version */
+       sidecar_path = NULL;
+
+#ifdef HAVE_EXIV2
+       /* we are not able to handle XMP sidecars without exiv2 */
+       sidecar_path = cache_find_location(CACHE_TYPE_XMP_METADATA, fd->path);
+
+       if (!sidecar_path) sidecar_path = file_data_get_sidecar_path(fd, TRUE);
+#endif
 
        fd->exif = exif_read(fd->path, sidecar_path, fd->modified_xmp);
+
+       g_free(sidecar_path);
+       file_cache_put(exif_cache, fd, 1);
        return fd->exif;
 }
 
-gint exif_write_fd(FileData *fd)
-{
-       gint success;
-       ExifData *exif;
-       
-       /*  exif_read_fd can either use cached metadata which have fd->modified_xmp already applied 
-                                    or read metadata from file and apply fd->modified_xmp
-           metadata are read also if the file was modified meanwhile */
-       exif = exif_read_fd(fd); 
-       if (!exif) return FALSE;
-       success = exif_write(exif); /* write modified metadata */
-       exif_free_fd(fd, exif);
-       return success;
-}
 
 void exif_free_fd(FileData *fd, ExifData *exif)
 {
        if (!fd) return;
        g_assert(fd->exif == exif);
-       
-       file_cache_put(exif_cache, fd, 1);
 }
 
 /* embedded icc in jpeg */
 
-
-#define JPEG_MARKER            0xFF
-#define JPEG_MARKER_SOI                0xD8
-#define JPEG_MARKER_EOI                0xD9
-#define JPEG_MARKER_APP1       0xE1
-#define JPEG_MARKER_APP2       0xE2
-
-/* jpeg container format:
-     all data markers start with 0XFF
-     2 byte long file start and end markers: 0xFFD8(SOI) and 0XFFD9(EOI)
-     4 byte long data segment markers in format: 0xFFTTSSSSNNN...
-       FF:   1 byte standard marker identifier
-       TT:   1 byte data type
-       SSSS: 2 bytes in Motorola byte alignment for length of the data.
-            This value includes these 2 bytes in the count, making actual
-            length of NN... == SSSS - 2.
-       NNN.: the data in this segment
- */
-
-gint exif_jpeg_segment_find(guchar *data, guint size,
-                           guchar app_marker, const gchar *magic, guint magic_len,
-                           guint *seg_offset, guint *seg_length)
-{
-       guchar marker = 0;
-       guint offset = 0;
-       guint length = 0;
-
-       while (marker != app_marker &&
-              marker != JPEG_MARKER_EOI)
-               {
-               offset += length;
-               length = 2;
-
-               if (offset + 2 >= size ||
-                   data[offset] != JPEG_MARKER) return FALSE;
-
-               marker = data[offset + 1];
-               if (marker != JPEG_MARKER_SOI &&
-                   marker != JPEG_MARKER_EOI)
-                       {
-                       if (offset + 4 >= size) return FALSE;
-                       length += ((guint)data[offset + 2] << 8) + data[offset + 3];
-                       }
-               }
-
-       if (marker == app_marker &&
-           offset + length < size &&
-           length >= 4 + magic_len &&
-           memcmp(data + offset + 4, magic, magic_len) == 0)
-               {
-               *seg_offset = offset + 4;
-               *seg_length = length - 4;
-               return TRUE;
-               }
-
-       return FALSE;
-}
-
-gint exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
+gboolean exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
 {
        guint seg_offset = 0;
        guint seg_length = 0;
@@ -728,7 +1081,7 @@ gint exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
           TT = total number of ICC segments (TT in each ICC segment should match)
         */
 
-       while (exif_jpeg_segment_find(data + seg_offset + seg_length,
+       while (jpeg_segment_find(data + seg_offset + seg_length,
                                      size - seg_offset - seg_length,
                                      JPEG_MARKER_APP2,
                                      "ICC_PROFILE\x00", 12,
@@ -788,4 +1141,127 @@ gint exif_jpeg_parse_color(ExifData *exif, guchar *data, guint size)
 
        return FALSE;
 }
+
+/*
+ *-------------------------------------------------------------------
+ * file info
+ * it is here because it shares tag neming infrastructure with exif
+ * we should probably not invest too much effort into this because
+ * new exiv2 will support the same functionality
+ * http://dev.exiv2.org/issues/show/505
+ *-------------------------------------------------------------------
+ */
+
+static gchar *mode_number(mode_t m)
+{
+       gint mb, mu, mg, mo;
+       gchar pbuf[12];
+
+       mb = mu = mg = mo = 0;
+
+       if (m & S_ISUID) mb |= 4;
+       if (m & S_ISGID) mb |= 2;
+       if (m & S_ISVTX) mb |= 1;
+
+       if (m & S_IRUSR) mu |= 4;
+       if (m & S_IWUSR) mu |= 2;
+       if (m & S_IXUSR) mu |= 1;
+
+       if (m & S_IRGRP) mg |= 4;
+       if (m & S_IWGRP) mg |= 2;
+       if (m & S_IXGRP) mg |= 1;
+
+       if (m & S_IROTH) mo |= 4;
+       if (m & S_IWOTH) mo |= 2;
+       if (m & S_IXOTH) mo |= 1;
+
+       pbuf[0] = (m & S_IRUSR) ? 'r' : '-';
+       pbuf[1] = (m & S_IWUSR) ? 'w' : '-';
+       pbuf[2] = (m & S_IXUSR) ? 'x' : '-';
+       pbuf[3] = (m & S_IRGRP) ? 'r' : '-';
+       pbuf[4] = (m & S_IWGRP) ? 'w' : '-';
+       pbuf[5] = (m & S_IXGRP) ? 'x' : '-';
+       pbuf[6] = (m & S_IROTH) ? 'r' : '-';
+       pbuf[7] = (m & S_IWOTH) ? 'w' : '-';
+       pbuf[8] = (m & S_IXOTH) ? 'x' : '-';
+       pbuf[9] = '\0';
+
+       return g_strdup_printf("%s (%d%d%d%d)", pbuf, mb, mu, mg, mo);
+}
+
+gchar *metadata_file_info(FileData *fd, const gchar *key, MetadataFormat format)
+{
+       gchar *page_n_of_m;
+
+       if (strcmp(key, "file.size") == 0)
+               {
+               return g_strdup_printf("%ld", (long)fd->size);
+               }
+       if (strcmp(key, "file.date") == 0)
+               {
+               return g_strdup(text_from_time(fd->date));
+               }
+       if (strcmp(key, "file.mode") == 0)
+               {
+               return mode_number(fd->mode);
+               }
+       if (strcmp(key, "file.ctime") == 0)
+               {
+               return g_strdup(text_from_time(fd->cdate));
+               }
+       if (strcmp(key, "file.class") == 0)
+               {
+               return g_strdup(format_class_list[fd->format_class]);
+               }
+       if (strcmp(key, "file.owner") == 0)
+               {
+               return g_strdup(fd->owner);
+               }
+       if (strcmp(key, "file.group") == 0)
+               {
+               return g_strdup(fd->group);
+               }
+       if (strcmp(key, "file.link") == 0)
+               {
+               return g_strdup(fd->sym_link);
+               }
+       if (strcmp(key, "file.page_no") == 0)
+               {
+               if (fd->page_total > 1)
+                       {
+                       page_n_of_m = g_strdup_printf("[%d/%d]", fd->page_num + 1, fd->page_total);
+                       return page_n_of_m;
+                       }
+               else
+                       {
+                       return NULL;
+                       }
+               }
+       return g_strdup("");
+}
+
+#ifdef HAVE_LUA
+gchar *metadata_lua_info(FileData *fd, const gchar *key, MetadataFormat format)
+{
+       gchar *script_name;
+       gchar *script_name_utf8;
+       gchar *data;
+       gchar *raw_data;
+       gchar *valid_data;
+
+       script_name_utf8 = g_strdup(key + 4);
+       script_name = path_from_utf8(script_name_utf8);
+
+       raw_data = lua_callvalue(fd, script_name, NULL);
+       valid_data = g_utf8_make_valid(raw_data, -1);
+       data = g_utf8_substring(valid_data, 0, 150);
+
+       g_free(script_name);
+       g_free(script_name_utf8);
+       g_free(raw_data);
+       g_free(valid_data);
+
+       return data;
+}
+#endif
 /* vim: set shiftwidth=8 softtabstop=0 cindent cinoptions={1s: */