/* Eye Of Gnome - 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 Street, Fifth Floor, Boston, MA 02110-1301, USA. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef HAVE_STRPTIME #define _XOPEN_SOURCE #define _XOPEN_SOURCE_EXTENDED 1 #endif #include #include "eog-exif-util.h" #include "eog-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 EogExifData; /* Define EogExifData type */ G_DEFINE_BOXED_TYPE(EogExifData, eog_exif_data, eog_exif_data_copy, eog_exif_data_free) #ifdef HAVE_STRPTIME 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); } #endif /** * _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; } /* Older GCCs don't support pragma diagnostic inside functions. * Put these here to avoid problems with the strftime format strings * without breaking the build for these older GCCs */ #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wformat-nonliteral" #ifdef HAVE_STRPTIME static gchar * eog_exif_util_format_date_with_strptime (const gchar *date, const gchar* format) { 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), format, &tm); new_date = g_strndup (tmp_date, dlen); } return new_date; } #else static gchar * eog_exif_util_format_date_by_hand (const gchar *date, const gchar* format) { 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; 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); tm.tm_sec = result < 6 ? 0 : seconds; tm.tm_min = result < 5 ? 0 : minutes; tm.tm_hour = result < 4 ? 0 : hour; dlen = strftime (tmp_date, DATE_BUF_SIZE * sizeof(gchar), format, &tm); if (dlen == 0) return NULL; else new_date = g_strndup (tmp_date, dlen); } return new_date; } #endif /* HAVE_STRPTIME */ #pragma GCC diagnostic pop /** * eog_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 * eog_exif_util_format_date (const gchar *date) { gchar *new_date; #ifdef HAVE_STRPTIME /* A strftime-formatted string, to display the date the image was taken. */ new_date = eog_exif_util_format_date_with_strptime (date, _("%a, %d %B %Y %X")); #else new_date = eog_exif_util_format_date_by_hand (date, _("%a, %d %B %Y %X")); #endif /* HAVE_STRPTIME */ return new_date; } void eog_exif_util_set_label_text (GtkLabel *label, EogExifData *exif_data, gint tag_id) { gchar exif_buffer[512]; const gchar *buf_ptr; gchar *label_text = NULL; g_return_if_fail (GTK_IS_LABEL (label)); if (exif_data) { buf_ptr = eog_exif_data_get_value (exif_data, tag_id, exif_buffer, 512); if (tag_id == EXIF_TAG_DATE_TIME_ORIGINAL && buf_ptr) label_text = eog_exif_util_format_date (buf_ptr); else label_text = g_utf8_make_valid (buf_ptr, -1); } gtk_label_set_text (label, label_text); g_free (label_text); } void eog_exif_util_format_datetime_label (GtkLabel *label, EogExifData *exif_data, gint tag_id, const gchar *format) { gchar exif_buffer[512]; const gchar *buf_ptr; gchar *label_text = NULL; g_return_if_fail (GTK_IS_LABEL (label)); g_warn_if_fail (tag_id == EXIF_TAG_DATE_TIME_ORIGINAL); if (exif_data) { buf_ptr = eog_exif_data_get_value (exif_data, tag_id, exif_buffer, 512); if (tag_id == EXIF_TAG_DATE_TIME_ORIGINAL && buf_ptr) #ifdef HAVE_STRPTIME label_text = eog_exif_util_format_date_with_strptime (buf_ptr, format); #else label_text = eog_exif_util_format_date_by_hand (buf_ptr, format); #endif /* HAVE_STRPTIME */ } gtk_label_set_text (label, label_text); g_free (label_text); } void eog_exif_util_set_focal_length_label_text (GtkLabel *label, EogExifData *exif_data) { ExifEntry *entry = NULL, *entry35mm = NULL; ExifByteOrder byte_order; gfloat f_val = 0.0; gchar *fl_text = NULL,*fl35_text = NULL; /* If no ExifData is supplied the label will be * cleared later as fl35_text is NULL. */ if (exif_data != NULL) { entry = exif_data_get_entry (exif_data, EXIF_TAG_FOCAL_LENGTH); entry35mm = exif_data_get_entry (exif_data, EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM); byte_order = exif_data_get_byte_order (exif_data); } if (entry && G_LIKELY (entry->format == EXIF_FORMAT_RATIONAL)) { ExifRational value; /* Decode value by hand as libexif is not necessarily returning * it in the format we want it to be. */ value = exif_get_rational (entry->data, byte_order); /* Guard against div by zero */ if (G_LIKELY(value.denominator != 0)) f_val = (gfloat)value.numerator/ (gfloat)value.denominator; /* TRANSLATORS: This is the actual focal length used when the image was taken.*/ fl_text = g_strdup_printf (_("%.1f (lens)"), f_val); } if (entry35mm && G_LIKELY (entry35mm->format == EXIF_FORMAT_SHORT)) { ExifShort s_val; s_val = exif_get_short (entry35mm->data, byte_order); /* Print as float to get a similar look as above. */ /* TRANSLATORS: This is the equivalent focal length assuming a 35mm film camera. */ fl35_text = g_strdup_printf(_("%.1f (35mm film)"),(float)s_val); } if (fl_text) { if (fl35_text) { gchar *merged_txt; merged_txt = g_strconcat (fl35_text,", ", fl_text, NULL); gtk_label_set_text (label, merged_txt); g_free (merged_txt); } else { gtk_label_set_text (label, fl_text); } } else { /* This will also clear the label if no ExifData was supplied */ gtk_label_set_text (label, fl35_text); } g_free (fl35_text); g_free (fl_text); } /** * eog_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 * eog_exif_data_get_value (EogExifData *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; } EogExifData * eog_exif_data_copy (EogExifData *data) { exif_data_ref (data); return data; } void eog_exif_data_free (EogExifData *data) { exif_data_unref (data); }