/* Eye Of Mate - EXIF Utilities * * Copyright (C) 2006-2007 The Free Software Foundation * * Author: Lucas Rocha * Author: Claudio Saavedra * Author: Felix Riemann * * Based on code by: * - Jens Finke * * 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 St, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef HAVE_STRPTIME #define _XOPEN_SOURCE #endif #include #include "eom-exif-util.h" #include #include #define DATE_BUF_SIZE 200 /* gboolean <-> gpointer conversion macros taken from gedit */ #ifndef GBOOLEAN_TO_POINTER #define GBOOLEAN_TO_POINTER(i) (GINT_TO_POINTER ((i) ? 2 : 1)) #endif #ifndef GPOINTER_TO_BOOLEAN #define GPOINTER_TO_BOOLEAN(i) ((gboolean) ((GPOINTER_TO_INT (i) == 2) ? TRUE : FALSE)) #endif typedef ExifData EomExifData; /* Define EomExifData type */ G_DEFINE_BOXED_TYPE(EomExifData, eom_exif_data, eom_exif_data_copy, eom_exif_data_free) static gpointer _check_strptime_updates_wday (gpointer data) { struct tm tm; memset (&tm, '\0', sizeof (tm)); strptime ("2008:12:24 20:30:45", "%Y:%m:%d %T", &tm); /* Check if tm.tm_wday is set to Wednesday (3) now */ return GBOOLEAN_TO_POINTER (tm.tm_wday == 3); } /** * _calculate_wday_yday: * @tm: A struct tm that should be updated. * * Ensure tm_wday and tm_yday are set correctly in a struct tm. * The other date (dmy) values must have been set already. **/ static void _calculate_wday_yday (struct tm *tm) { GDate *exif_date; struct tm tmp_tm; exif_date = g_date_new_dmy (tm->tm_mday, tm->tm_mon+1, tm->tm_year+1900); g_return_if_fail (exif_date != NULL && g_date_valid (exif_date)); // Use this to get GLib <-> libc corrected values g_date_to_struct_tm (exif_date, &tmp_tm); g_date_free (exif_date); tm->tm_wday = tmp_tm.tm_wday; tm->tm_yday = tmp_tm.tm_yday; } #ifdef HAVE_STRPTIME static gchar * eom_exif_util_format_date_with_strptime (const gchar *date) { static GOnce strptime_updates_wday = G_ONCE_INIT; 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)) { g_once (&strptime_updates_wday, _check_strptime_updates_wday, NULL); // Ensure tm.tm_wday and tm.tm_yday are set if (!GPOINTER_TO_BOOLEAN (strptime_updates_wday.retval)) _calculate_wday_yday (&tm); /* 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 * eom_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; // Calculate tm.tm_wday _calculate_wday_yday (&tm); 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 */ /** * eom_exif_util_format_date: * @date: a date string following Exif specifications * * Takes a date string formatted after Exif specifications and generates a * more readable, possibly localized, string out of it. * * Returns: a newly allocated date string formatted according to the * current locale. */ gchar * eom_exif_util_format_date (const gchar *date) { gchar *new_date; #ifdef HAVE_STRPTIME new_date = eom_exif_util_format_date_with_strptime (date); #else new_date = eom_exif_util_format_date_by_hand (date); #endif /* HAVE_STRPTIME */ return new_date; } /** * eom_exif_data_get_value: * @exif_data: pointer to an ExifData struct * @tag_id: the requested tag's id. See exif-tag.h * from the libexif package for possible values (e.g. %EXIF_TAG_EXPOSURE_MODE). * @buffer: a pre-allocated output buffer * @buf_size: size of @buffer * * Convenience function to extract a string representation of an Exif tag * directly from an ExifData struct. The string is * written into @buffer as far as @buf_size permits. * * Returns: a pointer to @buffer. */ const gchar * eom_exif_data_get_value (EomExifData *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; } EomExifData * eom_exif_data_copy (EomExifData *data) { exif_data_ref (data); return data; } void eom_exif_data_free (EomExifData *data) { exif_data_unref (data); }