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PIKApp/plug-ins/metadata/metadata-viewer.c

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/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* metadata.c
* Copyright (C) 2013 Hartmut Kuhse
* Copyright (C) 2016 Ben Touchette
*
* 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 3 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, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gexiv2/gexiv2.h>
#include <libpika/pika.h>
#include <libpika/pikaui.h>
#include "libpika/stdplugins-intl.h"
#include "metadata-tags.h"
#define PLUG_IN_PROC "plug-in-metadata-viewer"
#define PLUG_IN_BINARY "metadata-viewer"
#define PLUG_IN_ROLE "pika-metadata"
#define EXIF_PREFIX "Exif."
#define IPTC_PREFIX "Iptc."
#define XMP_PREFIX "Xmp."
/* The length at which to truncate tag values, in characters. */
#define TAG_VALUE_MAX_SIZE 1024
/* The length at which to truncate raw data (i.e., tag values
* of type "Byte" or "Undefined"), in bytes.
*/
#define RAW_DATA_MAX_SIZE 16
enum
{
C_XMP_TAG = 0,
C_XMP_VALUE,
NUM_XMP_COLS
};
enum
{
C_EXIF_TAG = 0,
C_EXIF_VALUE,
NUM_EXIF_COLS
};
enum
{
C_IPTC_TAG = 0,
C_IPTC_VALUE,
NUM_IPTC_COLS
};
typedef struct _Metadata Metadata;
typedef struct _MetadataClass MetadataClass;
struct _Metadata
{
PikaPlugIn parent_instance;
};
struct _MetadataClass
{
PikaPlugInClass parent_class;
};
#define METADATA_TYPE (metadata_get_type ())
#define METADATA(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), METADATA_TYPE, Metadata))
GType metadata_get_type (void) G_GNUC_CONST;
static GList * metadata_query_procedures (PikaPlugIn *plug_in);
static PikaProcedure * metadata_create_procedure (PikaPlugIn *plug_in,
const gchar *name);
static PikaValueArray * metadata_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
PikaProcedureConfig *config,
gpointer run_data);
static gboolean metadata_viewer_dialog (PikaImage *image,
PikaMetadata *g_metadata,
GError **error);
static void metadata_dialog_set_metadata (GExiv2Metadata *metadata,
GtkListStore *exif_store,
GtkListStore *xmp_store,
GtkListStore *iptc_store);
static void metadata_dialog_add_multiple_values (GExiv2Metadata *metadata,
const gchar *tag,
GtkListStore *store,
gint tag_column,
gint value_column);
static void metadata_dialog_append_tags (GExiv2Metadata *metadata,
gchar **tags,
GtkListStore *store,
gint tag_column,
gint value_column,
gboolean load_iptc);
static void metadata_dialog_add_tag (GtkListStore *store,
gint tag_column,
gint value_column,
const gchar *tag,
const gchar *value);
static void metadata_dialog_add_translated_tag (GExiv2Metadata *metadata,
GtkListStore *store,
gint tag_column,
gint value_column,
const gchar *tag);
static gchar * metadata_interpret_user_comment (gchar *comment);
static gchar * metadata_dialog_format_tag_value (GExiv2Metadata *metadata,
const gchar *tag,
gboolean truncate);
static gchar * metadata_format_string_value (const gchar *value,
gboolean truncate);
static inline gboolean metadata_tag_is_string (const gchar *tag);
G_DEFINE_TYPE (Metadata, metadata, PIKA_TYPE_PLUG_IN)
PIKA_MAIN (METADATA_TYPE)
DEFINE_STD_SET_I18N
static void
metadata_class_init (MetadataClass *klass)
{
PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
plug_in_class->query_procedures = metadata_query_procedures;
plug_in_class->create_procedure = metadata_create_procedure;
plug_in_class->set_i18n = STD_SET_I18N;
}
static void
metadata_init (Metadata *metadata)
{
}
static GList *
metadata_query_procedures (PikaPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static PikaProcedure *
metadata_create_procedure (PikaPlugIn *plug_in,
const gchar *name)
{
PikaProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = pika_image_procedure_new (plug_in, name,
PIKA_PDB_PROC_TYPE_PLUGIN,
metadata_run, NULL, NULL);
pika_procedure_set_image_types (procedure, "*");
pika_procedure_set_menu_label (procedure, _("_View Metadata"));
pika_procedure_add_menu_path (procedure, "<Image>/Image/Metadata");
pika_procedure_set_documentation (procedure,
_("View metadata (Exif, IPTC, XMP)"),
"View metadata information attached "
"to the current image. This can "
"include Exif, IPTC and/or XMP "
"information.",
name);
pika_procedure_set_attribution (procedure,
"Hartmut Kuhse, Michael Natterer, "
"Ben Touchette",
"Hartmut Kuhse, Michael Natterer, "
"Ben Touchette",
"2013, 2017");
}
return procedure;
}
static PikaValueArray *
metadata_run (PikaProcedure *procedure,
PikaRunMode run_mode,
PikaImage *image,
gint n_drawables,
PikaDrawable **drawables,
PikaProcedureConfig *config,
gpointer run_data)
{
PikaMetadata *metadata;
GError *error = NULL;
pika_ui_init (PLUG_IN_BINARY);
metadata = pika_image_get_metadata (image);
/* Always show metadata dialog so we can add appropriate iptc data
* as needed. Sometimes license data needs to be added after the
* fact and the image may not contain metadata but should have it
* added as needed.
*/
if (! metadata)
{
metadata = pika_metadata_new ();
pika_image_set_metadata (image, metadata);
}
if (metadata_viewer_dialog (image, metadata, &error))
return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS, NULL);
else
return pika_procedure_new_return_values (procedure, PIKA_PDB_EXECUTION_ERROR, error);
}
static gboolean
metadata_viewer_dialog (PikaImage *image,
PikaMetadata *g_metadata,
GError **error)
{
gchar *title;
gchar *name;
GtkWidget *dialog;
GtkWidget *content_area;
GtkWidget *metadata_vbox;
GtkWidget *notebook;
GtkWidget *scrolled_win;
GtkWidget *list_view;
GtkWidget *label;
GtkListStore *exif_store, *xmp_store, *iptc_store;
GtkCellRenderer *rend;
GtkTreeViewColumn *col;
GExiv2Metadata *metadata;
metadata = GEXIV2_METADATA(g_metadata);
name = pika_image_get_name (image);
title = g_strdup_printf (_("Metadata Viewer: %s"), name);
g_free (name);
dialog = pika_dialog_new (title,
"pika-metadata-viewer-dialog",
NULL, 0,
pika_standard_help_func, PLUG_IN_PROC,
_("_Close"), GTK_RESPONSE_CLOSE,
NULL);
gtk_widget_set_size_request(dialog, 650, 500);
g_free (title);
pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
GTK_RESPONSE_CLOSE,
-1);
content_area = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
/* Top-level Box */
metadata_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
gtk_container_add (GTK_CONTAINER (content_area), metadata_vbox);
gtk_container_set_border_width (GTK_CONTAINER (metadata_vbox), 12);
gtk_widget_show (metadata_vbox);
notebook = gtk_notebook_new ();
gtk_box_pack_start (GTK_BOX (metadata_vbox), notebook, TRUE, TRUE, 0);
/* EXIF tab */
scrolled_win = gtk_scrolled_window_new (NULL, NULL);
gtk_container_set_border_width (GTK_CONTAINER (scrolled_win), 6);
gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_win), GTK_SHADOW_IN);
exif_store = gtk_list_store_new (NUM_EXIF_COLS,
G_TYPE_STRING, /* column-name c_exif_tag */
G_TYPE_STRING); /* column-name c_exif_value */
list_view = gtk_tree_view_new_with_model (GTK_TREE_MODEL (exif_store));
gtk_widget_set_vexpand (list_view, TRUE);
rend = gtk_cell_renderer_text_new ();
col = gtk_tree_view_column_new_with_attributes (_("Exif Tag"),
rend,
"text", C_EXIF_TAG,
NULL);
gtk_tree_view_column_set_resizable (col, TRUE);
gtk_tree_view_column_set_spacing (col, 3);
gtk_tree_view_append_column (GTK_TREE_VIEW (list_view), col);
rend = gtk_cell_renderer_text_new ();
col = gtk_tree_view_column_new_with_attributes (_("Value"),
rend,
"text", C_EXIF_VALUE,
NULL);
gtk_tree_view_column_set_resizable (col, TRUE);
gtk_tree_view_column_set_spacing (col, 3);
gtk_tree_view_append_column (GTK_TREE_VIEW (list_view), col);
label = gtk_label_new (_("Exif"));
gtk_widget_show (label);
gtk_notebook_append_page (GTK_NOTEBOOK (notebook), scrolled_win, label);
gtk_container_add (GTK_CONTAINER (scrolled_win), list_view);
gtk_widget_show (list_view);
gtk_widget_show (scrolled_win);
/* XMP tab */
scrolled_win = gtk_scrolled_window_new (NULL, NULL);
gtk_container_set_border_width (GTK_CONTAINER (scrolled_win), 6);
gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_win), GTK_SHADOW_IN);
xmp_store = gtk_list_store_new (NUM_XMP_COLS,
G_TYPE_STRING, /* column-name c_xmp_tag */
G_TYPE_STRING); /* column-name c_xmp_value */
list_view = gtk_tree_view_new_with_model (GTK_TREE_MODEL (xmp_store));
gtk_widget_set_vexpand (list_view, TRUE);
rend = gtk_cell_renderer_text_new ();
col = gtk_tree_view_column_new_with_attributes (_("XMP Tag"),
rend,
"text", C_XMP_TAG,
NULL);
gtk_tree_view_column_set_resizable (col, TRUE);
gtk_tree_view_column_set_spacing (col, 3);
gtk_tree_view_append_column (GTK_TREE_VIEW (list_view), col);
rend = gtk_cell_renderer_text_new ();
col = gtk_tree_view_column_new_with_attributes (_("Value"),
rend,
"text", C_XMP_VALUE,
NULL);
gtk_tree_view_column_set_resizable (col, TRUE);
gtk_tree_view_column_set_spacing (col, 3);
gtk_tree_view_append_column (GTK_TREE_VIEW (list_view), col);
label = gtk_label_new (_("XMP"));
gtk_widget_show (label);
gtk_notebook_append_page (GTK_NOTEBOOK (notebook), scrolled_win, label);
gtk_container_add (GTK_CONTAINER (scrolled_win), list_view);
gtk_widget_show (list_view);
gtk_widget_show (scrolled_win);
/* IPTC tab */
scrolled_win = gtk_scrolled_window_new (NULL, NULL);
gtk_container_set_border_width (GTK_CONTAINER (scrolled_win), 6);
gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_win), GTK_SHADOW_IN);
iptc_store = gtk_list_store_new (NUM_IPTC_COLS,
G_TYPE_STRING, /* column-name c_iptc_tag */
G_TYPE_STRING); /* column-name c_iptc_value */
list_view = gtk_tree_view_new_with_model (GTK_TREE_MODEL (iptc_store));
gtk_widget_set_vexpand (list_view, TRUE);
rend = gtk_cell_renderer_text_new ();
col = gtk_tree_view_column_new_with_attributes (_("IPTC Tag"),
rend,
"text", C_IPTC_TAG,
NULL);
gtk_tree_view_column_set_resizable (col, TRUE);
gtk_tree_view_column_set_spacing (col, 3);
gtk_tree_view_append_column (GTK_TREE_VIEW (list_view), col);
rend = gtk_cell_renderer_text_new ();
col = gtk_tree_view_column_new_with_attributes (_("Value"),
rend,
"text", C_IPTC_VALUE,
NULL);
gtk_tree_view_column_set_resizable (col, TRUE);
gtk_tree_view_column_set_spacing (col, 3);
gtk_tree_view_append_column (GTK_TREE_VIEW (list_view), col);
label = gtk_label_new (_("IPTC"));
gtk_widget_show (label);
gtk_notebook_append_page (GTK_NOTEBOOK (notebook), scrolled_win, label);
gtk_container_add (GTK_CONTAINER (scrolled_win), list_view);
gtk_widget_show (list_view);
gtk_widget_show (scrolled_win);
gtk_widget_show (notebook);
/* Add the metadata to the tree views */
metadata_dialog_set_metadata (metadata, exif_store, xmp_store, iptc_store);
g_object_unref (exif_store);
g_object_unref (xmp_store);
g_object_unref (iptc_store);
gtk_dialog_run (GTK_DIALOG (dialog));
return TRUE;
}
/* private functions */
static void
metadata_dialog_set_metadata (GExiv2Metadata *metadata,
GtkListStore *exif_store,
GtkListStore *xmp_store,
GtkListStore *iptc_store)
{
gchar **tags;
/* load exif tags */
tags = gexiv2_metadata_get_exif_tags (metadata);
metadata_dialog_append_tags (metadata, tags, exif_store, C_EXIF_TAG, C_EXIF_VALUE, FALSE);
g_strfreev (tags);
/* load xmp tags */
tags = gexiv2_metadata_get_xmp_tags (metadata);
metadata_dialog_append_tags (metadata, tags, xmp_store, C_XMP_TAG, C_XMP_VALUE, FALSE);
g_strfreev (tags);
/* load iptc tags */
tags = gexiv2_metadata_get_iptc_tags (metadata);
metadata_dialog_append_tags (metadata, tags, iptc_store, C_IPTC_TAG, C_IPTC_VALUE, TRUE);
g_strfreev (tags);
}
static gchar *
metadata_format_string_value (const gchar *value,
gboolean truncate)
{
glong size;
gchar *result;
size = g_utf8_strlen (value, -1);
if (! truncate || size <= TAG_VALUE_MAX_SIZE)
{
result = g_strdup(value);
}
else
{
gchar *value_utf8_trunc;
GString *str;
value_utf8_trunc = g_utf8_substring (value, 0, TAG_VALUE_MAX_SIZE);
str = g_string_new (value_utf8_trunc);
g_free (value_utf8_trunc);
g_string_append (str, "... ");
g_string_append_printf (str,
_("(%lu more character(s))"),
size - TAG_VALUE_MAX_SIZE);
result = g_string_free (str, FALSE);
}
return result;
}
static inline gboolean
metadata_tag_is_string (const gchar *tag)
{
const gchar *tag_type;
GError *error = NULL;
tag_type = gexiv2_metadata_try_get_tag_type (tag, &error);
if (error)
{
g_printerr ("%s: Failed to get metadata tag type for tag %s: %s",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
return FALSE;
}
return (g_strcmp0 (tag_type, "Byte") != 0 &&
g_strcmp0 (tag_type, "Undefined") != 0 &&
g_strcmp0 (tag_type, NULL) != 0);
}
static void
metadata_dialog_add_tag (GtkListStore *store,
gint tag_column,
gint value_column,
const gchar *tag,
const gchar *value)
{
if (value)
{
GtkTreeIter iter;
gtk_list_store_append (store, &iter);
gtk_list_store_set (store, &iter,
tag_column, tag,
value_column, value,
-1);
}
}
static void
metadata_dialog_add_translated_tag (GExiv2Metadata *metadata,
GtkListStore *store,
gint tag_column,
gint value_column,
const gchar *tag)
{
gchar *value = NULL;
GError *error = NULL;
value = gexiv2_metadata_try_get_tag_interpreted_string (metadata, tag, &error);
if (error)
{
g_printerr ("%s: unreadable '%s' metadata tag: %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
metadata_dialog_add_tag (store, tag_column, value_column,
tag, gettext (value));
g_free (value);
}
static gchar *
metadata_interpret_user_comment (gchar *comment)
{
/* Exiv2 can return unwanted text at the start of a comment
* taken from Exif.Photo.UserComment since 0.27.3.
* Let's remove that part and replace with an empty string
* if there is nothing else left as comment. */
if (comment && g_str_has_prefix (comment, "charset=Ascii "))
{
gchar *real_comment;
/* Skip "charset=Ascii " (length 14) to find the real comment */
real_comment = comment + 14;
if (real_comment[0] == '\0' ||
! g_strcmp0 (real_comment, "binary comment"))
{
g_free (comment);
/* Make empty comment instead of returning NULL or else
* the exif value will not be shown at all. */
comment = g_strdup ("");
}
else
{
real_comment = g_strdup (real_comment);
g_free (comment);
return real_comment;
}
}
return comment;
}
static void
metadata_dialog_add_multiple_values (GExiv2Metadata *metadata,
const gchar *tag,
GtkListStore *store,
gint tag_column,
gint value_column)
{
gchar **values;
GError *error = NULL;
values = gexiv2_metadata_try_get_tag_multiple (GEXIV2_METADATA (metadata), tag, &error);
if (error)
{
g_printerr ("%s: unreadable '%s' metadata tag: %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
if (values)
{
gint i;
for (i = 0; values[i] != NULL; i++)
{
gchar *value;
GtkTreeIter iter;
gtk_list_store_append (store, &iter);
value = metadata_format_string_value (values[i], /* truncate = */ TRUE);
gtk_list_store_set (store, &iter,
tag_column, tag,
value_column, value,
-1);
g_free (value);
}
g_strfreev (values);
}
}
static void
metadata_dialog_append_tags (GExiv2Metadata *metadata,
gchar **tags,
GtkListStore *store,
gint tag_column,
gint value_column,
gboolean load_iptc)
{
const gchar *tag;
const gchar *last_tag = NULL;
gboolean gps_done = FALSE;
while ((tag = *tags++))
{
gchar *value;
/* We need special handling for iptc tags like "Keywords" which
* can appear multiple times. For now assuming that this can
* only happen for iptc tags of String and related types.
* See also: https://exiv2.org/iptc.html which only lists
* one Date type as repeatable (Iptc.Application2.ReferenceDate),
* and Date is handled here as string.
*/
if (load_iptc && metadata_tag_is_string (tag))
{
if (last_tag && ! strcmp (tag, last_tag))
{
continue;
}
last_tag = tag;
metadata_dialog_add_multiple_values (GEXIV2_METADATA (metadata),
tag, store,
tag_column,
value_column);
}
else if (! strcmp ("Exif.GPSInfo.GPSLongitude", tag) ||
! strcmp ("Exif.GPSInfo.GPSLongitudeRef", tag) ||
! strcmp ("Exif.GPSInfo.GPSLatitude", tag) ||
! strcmp ("Exif.GPSInfo.GPSLatitudeRef", tag) ||
! strcmp ("Exif.GPSInfo.GPSAltitude", tag) ||
! strcmp ("Exif.GPSInfo.GPSAltitudeRef", tag))
{
/* We need special handling for some of the GPS tags to
* be able to show better values than the default. */
if (! gps_done)
{
gdouble lng, lat, alt;
gchar *str;
gchar *value;
GError *error = NULL;
if (gexiv2_metadata_try_get_gps_longitude (GEXIV2_METADATA (metadata),
&lng, &error))
{
str = metadata_format_gps_longitude_latitude (lng);
metadata_dialog_add_tag (store,
tag_column, value_column,
"Exif.GPSInfo.GPSLongitude",
str);
g_free (str);
}
else if (error)
{
g_printerr ("%s: unreadable gps longitude tag: %s\n",
G_STRFUNC, error->message);
g_clear_error (&error);
}
metadata_dialog_add_translated_tag (metadata, store,
tag_column, value_column,
"Exif.GPSInfo.GPSLongitudeRef");
if (gexiv2_metadata_try_get_gps_latitude (GEXIV2_METADATA (metadata),
&lat, &error))
{
str = metadata_format_gps_longitude_latitude (lat);
metadata_dialog_add_tag (store,
tag_column, value_column,
"Exif.GPSInfo.GPSLatitude",
str);
g_free (str);
}
else if (error)
{
g_printerr ("%s: unreadable gps latitude tag: %s\n",
G_STRFUNC, error->message);
g_clear_error (&error);
}
metadata_dialog_add_translated_tag (metadata, store,
tag_column, value_column,
"Exif.GPSInfo.GPSLatitudeRef");
if (gexiv2_metadata_try_get_gps_altitude (GEXIV2_METADATA (metadata),
&alt, &error))
{
gchar *str2, *str3;
GError *error = NULL;
str = metadata_format_gps_altitude (alt, TRUE, _(" meter"));
str2 = metadata_format_gps_altitude (alt, FALSE, _(" feet"));
str3 = g_strdup_printf ("%s (%s)", str, str2);
metadata_dialog_add_tag (store,
tag_column, value_column,
"Exif.GPSInfo.GPSAltitude",
str3);
g_free (str);
g_free (str2);
g_free (str3);
value = gexiv2_metadata_try_get_tag_string (metadata,
"Exif.GPSInfo.GPSAltitudeRef",
&error);
if (error)
{
g_printerr ("%s: unreadable '%s' metadata tag: %s\n",
G_STRFUNC, "Exif.GPSInfo.GPSAltitudeRef",
error->message);
g_clear_error (&error);
}
if (value)
{
gint index;
if (value[0] == '0')
index = 1;
else if (value[0] == '1')
index = 2;
else
index = 0;
metadata_dialog_add_tag (store,
tag_column, value_column,
"Exif.GPSInfo.GPSAltitudeRef",
gettext (gpsaltref[index]));
g_free (value);
}
}
else if (error)
{
g_printerr ("%s: unreadable gps altitude tag: %s\n",
G_STRFUNC, error->message);
g_clear_error (&error);
}
gps_done = TRUE;
}
}
else if (! strcmp ("Exif.Photo.UserComment", tag))
{
GError *error = NULL;
value = gexiv2_metadata_try_get_tag_interpreted_string (metadata, tag, &error);
if (error)
{
g_printerr ("%s: unreadable '%s' metadata tag: %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
/* Can start with charset. Remove part that is not relevant. */
value = metadata_interpret_user_comment (value);
metadata_dialog_add_tag (store,
tag_column, value_column,
tag, value);
g_free (value);
}
else
{
if (g_str_has_prefix (tag, "Xmp."))
{
GError *error = NULL;
const gchar *tag_type;
tag_type = gexiv2_metadata_try_get_tag_type (tag, &error);
if (error)
{
g_printerr ("%s: Failed to get metadata tag type for tag %s: %s",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
else if (g_strcmp0 (tag_type, "XmpText") != 0)
{
metadata_dialog_add_multiple_values (GEXIV2_METADATA (metadata),
tag, store,
tag_column,
value_column);
continue;
}
}
value = metadata_dialog_format_tag_value (metadata, tag,
/* truncate = */ TRUE);
metadata_dialog_add_tag (store,
tag_column, value_column,
tag, value);
g_free (value);
}
}
}
static gchar *
metadata_dialog_format_tag_value (GExiv2Metadata *metadata,
const gchar *tag,
gboolean truncate)
{
gchar *result;
if (metadata_tag_is_string(tag))
{
gchar *value;
gchar *value_utf8;
GError *error = NULL;
value = gexiv2_metadata_try_get_tag_interpreted_string (metadata, tag, &error);
if (error)
{
g_printerr ("%s: unreadable '%s' metadata tag: %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
if (! g_utf8_validate (value, -1, NULL))
{
value_utf8 = g_locale_to_utf8 (value, -1, NULL, NULL, NULL);
}
else
{
value_utf8 = g_strdup (value);
}
g_free (value);
result = metadata_format_string_value (value_utf8, truncate);
}
else
{
GBytes *bytes;
const guchar *data;
gsize size;
gsize display_size;
GString *str;
gint i;
GError *error = NULL;
bytes = gexiv2_metadata_try_get_tag_raw (metadata, tag, &error);
if (error)
{
g_printerr ("%s: unreadable '%s' metadata tag: %s\n",
G_STRFUNC, tag, error->message);
g_clear_error (&error);
}
data = g_bytes_get_data (bytes, &size);
if (! truncate)
display_size = size;
else
display_size = MIN (size, RAW_DATA_MAX_SIZE);
str = g_string_sized_new (3 * display_size);
for (i = 0; i < display_size; i++)
g_string_append_printf (str, i == 0 ? "%02x" : " %02x", data[i]);
if (display_size < size)
{
g_string_append (str, " ... ");
g_string_append_printf (str,
_("(%llu more byte(s))"),
(unsigned long long) (size - display_size));
}
result = g_string_free (str, FALSE);
g_bytes_unref (bytes);
}
return result;
}
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