eog-exif-util.c

/* Eye Of Gnome - EXIF Utilities 
 *
 * Copyright (C) 2006-2007 The Free Software Foundation
 *
 * Author: Lucas Rocha <lucasr@gnome.org>
 * Author: Claudio Saavedra <csaavedra@alumnos.utalca.cl>
 * Author: Felix Riemann <felix@hsgheli.de>
 *
 * Based on code by:
 *    - Jens Finke <jens@gnome.org>
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_STRPTIME
#define _XOPEN_SOURCE
#endif
#include <time.h>

#include "eog-exif-util.h"

#include <string.h>
#include <glib/gi18n.h>

#define DATE_BUF_SIZE 200

#ifdef HAVE_STRPTIME
static gchar *  
eog_exif_util_format_date_with_strptime (const gchar *date)
{
      gchar *new_date = NULL;
      gchar tmp_date[DATE_BUF_SIZE];
      gchar *p;
      gsize dlen;
      struct tm tm;
      
      memset (&tm, '\0', sizeof (tm));
      p = strptime (date, "%Y:%m:%d %T", &tm);

      if (p == date + strlen (date)) {
            /* A strftime-formatted string, to display the date the image was taken.  */
            dlen = strftime (tmp_date, DATE_BUF_SIZE * sizeof(gchar), _("%a, %d %B %Y  %X"), &tm);
            new_date = g_strndup (tmp_date, dlen);
      }

      return new_date;
}
#else
static gchar *
eog_exif_util_format_date_by_hand (const gchar *date)
{
      int year, month, day, hour, minutes, seconds;
      int result;
      gchar *new_date = NULL;
      
      result = sscanf (date, "%d:%d:%d %d:%d:%d",
                   &year, &month, &day, &hour, &minutes, &seconds);

      if (result < 3 || !g_date_valid_dmy (day, month, year)) {
            return NULL;
      } else {
            gchar tmp_date[DATE_BUF_SIZE];
            gsize dlen;
            time_t secs;
            struct tm tm;
            
            memset (&tm, '\0', sizeof (tm));
            tm.tm_mday = day;
            tm.tm_mon = month-1;
            tm.tm_year = year-1900;
            
            if (result < 5) {
                  /* A strftime-formatted string, to display the date the image was taken, for the case we don't have the time.  */
                  dlen = strftime (tmp_date, DATE_BUF_SIZE * sizeof(gchar), _("%a, %d %B %Y"), &tm);
            } else {
                  tm.tm_sec = result < 6 ? 0 : seconds;
                  tm.tm_min = minutes;
                  tm.tm_hour = hour;
                  /* A strftime-formatted string, to display the date the image was taken.  */
                  dlen = strftime (tmp_date, DATE_BUF_SIZE * sizeof(gchar), _("%a, %d %B %Y  %X"), &tm);
            }

            if (dlen == 0) 
                  return NULL;
            else
                  new_date = g_strndup (tmp_date, dlen);
      }
      return new_date;
}
#endif /* HAVE_STRPTIME */

gchar *  
eog_exif_util_format_date (const gchar *date)
{
      gchar *new_date;
#ifdef HAVE_STRPTIME
      new_date = eog_exif_util_format_date_with_strptime (date);
#else
      new_date = eog_exif_util_format_date_by_hand (date);
#endif /* HAVE_STRPTIME */
      return new_date;
}

const gchar * 
eog_exif_util_get_value (ExifData *exif_data, gint tag_id, gchar *buffer, guint buf_size)
{
      ExifEntry *exif_entry;
      const gchar *exif_value;

        exif_entry = exif_data_get_entry (exif_data, tag_id);

      buffer[0] = 0;

      exif_value = exif_entry_get_value (exif_entry, buffer, buf_size);

      return exif_value;
}