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/*
* Copyright (C) 2010, Nokia <ivan.frade@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include <libtracker-common/tracker-file-utils.h>
#include <libtracker-extract/tracker-extract.h>
#define ICON_HEADER_SIZE_16 3
#define ICON_IMAGE_METADATA_SIZE_8 16
static gboolean
find_max_width_and_height (const gchar *uri,
guint *width,
guint *height)
{
GError *error = NULL;
GFile *file;
GFileInputStream *stream;
guint n_images;
guint i;
guint16 header [ICON_HEADER_SIZE_16];
*width = 0;
*height = 0;
file = g_file_new_for_uri (uri);
stream = g_file_read (file, NULL, &error);
if (error) {
g_message ("Could not read file '%s': %s",
uri,
error->message);
g_error_free (error);
g_object_unref (file);
return FALSE;
}
/* Header consists of:
* - 2bytes, reserved, must be 0
* - 2bytes, image type (1:icon, 2:cursor, other values invalid)
* - 2bytes, number of images in the file.
*
* Right now we just need the number of images in the file.
*/
if (!g_input_stream_read_all (G_INPUT_STREAM (stream),
header,
ICON_HEADER_SIZE_16 * 2,
NULL,
NULL,
&error)) {
g_message ("Error reading icon header from stream: '%s'",
error->message);
g_error_free (error);
g_object_unref (stream);
g_object_unref (file);
return FALSE;
}
n_images = GUINT16_FROM_LE (header[2]);
g_debug ("Found '%u' images in the icon file...", n_images);
/* Loop images looking for the biggest one... */
for (i = 0; i < n_images; i++) {
guint8 image_metadata [ICON_IMAGE_METADATA_SIZE_8];
/* Image metadata chunk consists of:
* - 1 byte, width in pixels, 0 means 256
* - 1 byte, height in pixels, 0 means 256
* - Plus some other stuff we don't care about...
*/
if (!g_input_stream_read_all (G_INPUT_STREAM (stream),
image_metadata,
ICON_IMAGE_METADATA_SIZE_8,
NULL,
NULL,
&error)) {
g_message ("Error reading icon image metadata '%u' from stream: '%s'",
i,
error->message);
g_error_free (error);
break;
}
g_debug (" Image '%u'; width:%u height:%u",
i,
image_metadata[0],
image_metadata[1]);
/* Width... */
if (image_metadata[0] == 0) {
*width = 256;
} else if (image_metadata[0] > *width) {
*width = image_metadata[0];
}
/* Height... */
if (image_metadata[1] == 0) {
*height = 256;
} else if (image_metadata[1] > *width) {
*height = image_metadata[0];
}
}
g_input_stream_close (G_INPUT_STREAM (stream), NULL, NULL);
g_object_unref (stream);
g_object_unref (file);
return TRUE;
}
G_MODULE_EXPORT gboolean
tracker_extract_get_metadata (TrackerExtractInfo *info)
{
TrackerSparqlBuilder *metadata;
guint max_width;
guint max_height;
GFile *file;
gchar *uri;
metadata = tracker_extract_info_get_metadata_builder (info);
file = tracker_extract_info_get_file (info);
uri = g_file_get_uri (file);
/* The Windows Icon file format may contain the same icon with different
* sizes inside, so there's no clear way of setting single width and
* height values. Thus, we set maximum sizes found. */
tracker_sparql_builder_predicate (metadata, "a");
tracker_sparql_builder_object (metadata, "nfo:Image");
tracker_sparql_builder_object (metadata, "nfo:Icon");
if (find_max_width_and_height (uri, &max_width, &max_height)) {
if (max_width > 0) {
tracker_sparql_builder_predicate (metadata, "nfo:width");
tracker_sparql_builder_object_int64 (metadata, (gint64) max_width);
}
if (max_height > 0) {
tracker_sparql_builder_predicate (metadata, "nfo:height");
tracker_sparql_builder_object_int64 (metadata, (gint64) max_height);
}
}
g_free (uri);
return TRUE;
}
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