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Gimp/plug-ins/metadata/metadata-viewer.c
Niels De Graef af3007afbf plug-ins: Use GtkListBox in metadata viewer 
This commit changes the metadata viewer to use `GtkListBox`es instead of
`GtkTreeView`s for displaying the tags and their values. The main
advantages is that the latter isn't available in GTK4 (making the
eventual port to it smaller), that they have a11y problems, and that
list boxes allow more advanced UIs than just showing a simple string.
One thing for example that this commit introduces, is to make the labels
selectable, so they can be easily copy-pasted for lookup.

Since we wanted to use `GListModel`, this commit also introduces a
helper object `GimpMetadataTagObject` which holds both a tag's name and
its value. In the future, we could use this to move the string
formatting logic to that helper object, which we could then in turn use
for more advanced UIs.
2025-07-11 21:44:09 +00:00

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/* GIMP - The GNU Image Manipulation Program
* 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 <libgimp/gimp.h>
#include <libgimp/gimpui.h>
#include "libgimp/stdplugins-intl.h"
#include "metadata-tag-object.h"
#include "metadata-tags.h"
#define PLUG_IN_PROC "plug-in-metadata-viewer"
#define PLUG_IN_BINARY "metadata-viewer"
#define PLUG_IN_ROLE "gimp-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
#define GIMP_TYPE_METADATA_VIEWER (gimp_metadata_viewer_get_type ())
G_DECLARE_FINAL_TYPE (GimpMetadataViewer, gimp_metadata_viewer, GIMP, METADATA_VIEWER, GimpPlugIn)
struct _GimpMetadataViewer
{
GimpPlugIn parent_instance;
};
static GList * metadata_query_procedures (GimpPlugIn *plug_in);
static GimpProcedure * metadata_create_procedure (GimpPlugIn *plug_in,
const gchar *name);
static GimpValueArray * metadata_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
GimpDrawable **drawables,
GimpProcedureConfig *config,
gpointer run_data);
static gboolean metadata_viewer_dialog (GimpImage *image,
GimpMetadata *g_metadata,
GError **error);
static void metadata_dialog_set_metadata (GExiv2Metadata *metadata,
GListStore *exif_store,
GListStore *xmp_store,
GListStore *iptc_store);
static GtkWidget * create_widget_for_tag_object (gpointer item,
gpointer user_data);
static void metadata_dialog_add_multiple_values (GExiv2Metadata *metadata,
const gchar *tag,
GListStore *store);
static void metadata_dialog_append_tags (GExiv2Metadata *metadata,
gchar **tags,
GListStore *store,
gboolean load_iptc);
static void metadata_dialog_add_tag (GListStore *store,
const gchar *tag,
const gchar *value);
static void metadata_dialog_add_translated_tag (GExiv2Metadata *metadata,
GListStore *store,
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 (GimpMetadataViewer, gimp_metadata_viewer, GIMP_TYPE_PLUG_IN)
GIMP_MAIN (GIMP_TYPE_METADATA_VIEWER)
DEFINE_STD_SET_I18N
static void
gimp_metadata_viewer_class_init (GimpMetadataViewerClass *klass)
{
GimpPlugInClass *plug_in_class = GIMP_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
gimp_metadata_viewer_init (GimpMetadataViewer *self)
{
}
static GList *
metadata_query_procedures (GimpPlugIn *plug_in)
{
return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
}
static GimpProcedure *
metadata_create_procedure (GimpPlugIn *plug_in,
const gchar *name)
{
GimpProcedure *procedure = NULL;
if (! strcmp (name, PLUG_IN_PROC))
{
procedure = gimp_image_procedure_new (plug_in, name,
GIMP_PDB_PROC_TYPE_PLUGIN,
metadata_run, NULL, NULL);
gimp_procedure_set_image_types (procedure, "*");
gimp_procedure_set_menu_label (procedure, _("_View Metadata"));
gimp_procedure_add_menu_path (procedure, "<Image>/Image/Metadata");
gimp_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);
gimp_procedure_set_attribution (procedure,
"Hartmut Kuhse, Michael Natterer, "
"Ben Touchette",
"Hartmut Kuhse, Michael Natterer, "
"Ben Touchette",
"2013, 2017");
}
return procedure;
}
static GimpValueArray *
metadata_run (GimpProcedure *procedure,
GimpRunMode run_mode,
GimpImage *image,
GimpDrawable **drawables,
GimpProcedureConfig *config,
gpointer run_data)
{
GimpMetadata *metadata;
GError *error = NULL;
gimp_ui_init (PLUG_IN_BINARY);
metadata = gimp_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 = gimp_metadata_new ();
gimp_image_set_metadata (image, metadata);
}
if (metadata_viewer_dialog (image, metadata, &error))
return gimp_procedure_new_return_values (procedure, GIMP_PDB_SUCCESS, NULL);
else
return gimp_procedure_new_return_values (procedure, GIMP_PDB_EXECUTION_ERROR, error);
}
static gboolean
metadata_viewer_dialog (GimpImage *image,
GimpMetadata *g_metadata,
GError **error)
{
gchar *title;
gchar *name;
GtkWidget *dialog;
GtkWidget *content_area;
GtkWidget *metadata_vbox;
GtkWidget *notebook;
GtkWidget *scrolled_win;
GtkWidget *list_box;
GtkWidget *label;
GListStore *exif_store, *xmp_store, *iptc_store;
GExiv2Metadata *metadata;
metadata = GEXIV2_METADATA(g_metadata);
name = gimp_image_get_name (image);
title = g_strdup_printf (_("Metadata Viewer: %s"), name);
g_free (name);
dialog = gimp_dialog_new (title,
"gimp-metadata-viewer-dialog",
NULL, 0,
gimp_standard_help_func, PLUG_IN_PROC,
_("_Close"), GTK_RESPONSE_CLOSE,
NULL);
gtk_widget_set_size_request(dialog, 650, 500);
g_free (title);
gimp_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 = g_list_store_new (GIMP_TYPE_METADATA_TAG_OBJECT);
list_box = gtk_list_box_new ();
gtk_list_box_set_selection_mode (GTK_LIST_BOX (list_box),
GTK_SELECTION_NONE);
gtk_list_box_bind_model (GTK_LIST_BOX (list_box), G_LIST_MODEL (exif_store),
create_widget_for_tag_object, NULL, NULL);
gtk_widget_set_vexpand (list_box, TRUE);
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_box);
gtk_widget_show (list_box);
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 = g_list_store_new (GIMP_TYPE_METADATA_TAG_OBJECT);
list_box = gtk_list_box_new ();
gtk_list_box_set_selection_mode (GTK_LIST_BOX (list_box),
GTK_SELECTION_NONE);
gtk_list_box_bind_model (GTK_LIST_BOX (list_box), G_LIST_MODEL (xmp_store),
create_widget_for_tag_object, NULL, NULL);
gtk_widget_set_vexpand (list_box, TRUE);
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_box);
gtk_widget_show (list_box);
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 = g_list_store_new (GIMP_TYPE_METADATA_TAG_OBJECT);
list_box = gtk_list_box_new ();
gtk_list_box_set_selection_mode (GTK_LIST_BOX (list_box),
GTK_SELECTION_NONE);
gtk_list_box_bind_model (GTK_LIST_BOX (list_box), G_LIST_MODEL (iptc_store),
create_widget_for_tag_object, NULL, NULL);
gtk_widget_set_vexpand (list_box, TRUE);
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_box);
gtk_widget_show (list_box);
gtk_widget_show (scrolled_win);
gtk_widget_show (notebook);
/* Add the metadata to the list models */
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,
GListStore *exif_store,
GListStore *xmp_store,
GListStore *iptc_store)
{
gchar **tags;
/* load exif tags */
tags = gexiv2_metadata_get_exif_tags (metadata);
metadata_dialog_append_tags (metadata, tags, exif_store, FALSE);
g_strfreev (tags);
/* load xmp tags */
tags = gexiv2_metadata_get_xmp_tags (metadata);
metadata_dialog_append_tags (metadata, tags, xmp_store, FALSE);
g_strfreev (tags);
/* load iptc tags */
tags = gexiv2_metadata_get_iptc_tags (metadata);
metadata_dialog_append_tags (metadata, tags, iptc_store, TRUE);
g_strfreev (tags);
}
static GtkWidget *
create_widget_for_tag_object (gpointer item,
gpointer user_data)
{
GimpMetadataTagObject *tag_obj = GIMP_METADATA_TAG_OBJECT (item);
GtkWidget *row;
GtkWidget *box;
GtkWidget *tag_label;
GtkWidget *value_label;
row = gtk_list_box_row_new ();
gtk_list_box_row_set_activatable (GTK_LIST_BOX_ROW (row), FALSE);
gtk_style_context_add_class (gtk_widget_get_style_context (row),
"metadata-tag-row");
gtk_widget_show (row);
box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 3);
gtk_container_add (GTK_CONTAINER (row), box);
gtk_widget_show (box);
tag_label = gtk_label_new (gimp_metadata_tag_object_get_tag (tag_obj));
gtk_label_set_xalign (GTK_LABEL (tag_label), 0.0);
gtk_label_set_selectable (GTK_LABEL (tag_label), TRUE);
gtk_style_context_add_class (gtk_widget_get_style_context (row),
"metadata-tag-label");
gtk_style_context_add_class (gtk_widget_get_style_context (tag_label),
"dim-label");
gtk_widget_show (tag_label);
gtk_box_pack_start (GTK_BOX (box), tag_label, FALSE, FALSE, 0);
value_label = gtk_label_new (gimp_metadata_tag_object_get_value (tag_obj));
gtk_style_context_add_class (gtk_widget_get_style_context (value_label),
"metadata-value-label");
gtk_label_set_xalign (GTK_LABEL (value_label), 0.0);
gtk_label_set_selectable (GTK_LABEL (value_label), TRUE);
gtk_widget_show (value_label);
gtk_box_pack_start (GTK_BOX (box), value_label, FALSE, FALSE, 0);
return row;
}
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, "Undefined") != 0 &&
g_strcmp0 (tag_type, NULL) != 0);
}
static void
metadata_dialog_add_tag (GListStore *store,
const gchar *tag,
const gchar *value)
{
GimpMetadataTagObject *tag_object;
if (value == NULL)
return;
tag_object = gimp_metadata_tag_object_new (tag, value);
g_list_store_append (store, tag_object);
g_object_unref (tag_object);
}
static void
metadata_dialog_add_translated_tag (GExiv2Metadata *metadata,
GListStore *store,
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, 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,
GListStore *store)
{
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 == NULL)
return;
for (gsize i = 0; values[i] != NULL; i++)
{
gchar *value;
value = metadata_format_string_value (values[i], /* truncate = */ TRUE);
metadata_dialog_add_tag (store, tag, value);
g_free (value);
}
g_strfreev (values);
}
static void
metadata_dialog_append_tags (GExiv2Metadata *metadata,
gchar **tags,
GListStore *store,
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);
}
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,
"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,
"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,
"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,
"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,
"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,
"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, 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);
continue;
}
}
value = metadata_dialog_format_tag_value (metadata, tag,
/* truncate = */ TRUE);
metadata_dialog_add_tag (store, 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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