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-rw-r--r--src/hotplug-sniffer/shell-mime-sniffer.c590
1 files changed, 590 insertions, 0 deletions
diff --git a/src/hotplug-sniffer/shell-mime-sniffer.c b/src/hotplug-sniffer/shell-mime-sniffer.c
new file mode 100644
index 0000000..7a1c1fe
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+++ b/src/hotplug-sniffer/shell-mime-sniffer.c
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+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/*
+ * Copyright (C) 1999, 2000, 2001 Eazel, Inc.
+ * Copyright (C) 2011 Red Hat, Inc.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Cosimo Cecchi <cosimoc@redhat.com>
+ *
+ * The code for crawling the directory hierarchy is based on
+ * nautilus/libnautilus-private/nautilus-directory-async.c, with
+ * the following copyright and author:
+ *
+ * Copyright (C) 1999, 2000, 2001 Eazel, Inc.
+ * Author: Darin Adler <darin@bentspoon.com>
+ *
+ */
+
+#include "shell-mime-sniffer.h"
+#include "hotplug-mimetypes.h"
+
+#include <glib/gi18n.h>
+
+#include <gdk-pixbuf/gdk-pixbuf.h>
+
+#define LOADER_ATTRS \
+ G_FILE_ATTRIBUTE_STANDARD_TYPE "," \
+ G_FILE_ATTRIBUTE_STANDARD_NAME "," \
+ G_FILE_ATTRIBUTE_STANDARD_CONTENT_TYPE ","
+
+#define WATCHDOG_TIMEOUT 1500
+#define DIRECTORY_LOAD_ITEMS_PER_CALLBACK 100
+#define HIGH_SCORE_RATIO 0.10
+
+enum {
+ PROP_FILE = 1,
+ NUM_PROPERTIES
+};
+
+static GHashTable *image_type_table = NULL;
+static GHashTable *audio_type_table = NULL;
+static GHashTable *video_type_table = NULL;
+static GHashTable *docs_type_table = NULL;
+
+static GParamSpec *properties[NUM_PROPERTIES] = { NULL, };
+
+typedef struct {
+ ShellMimeSniffer *self;
+
+ GFile *file;
+ GFileEnumerator *enumerator;
+ GList *deep_count_subdirectories;
+
+ gint audio_count;
+ gint image_count;
+ gint document_count;
+ gint video_count;
+
+ gint total_items;
+} DeepCountState;
+
+typedef struct _ShellMimeSnifferPrivate ShellMimeSnifferPrivate;
+
+struct _ShellMimeSniffer
+{
+ GObject parent_instance;
+
+ ShellMimeSnifferPrivate *priv;
+};
+
+struct _ShellMimeSnifferPrivate {
+ GFile *file;
+
+ GCancellable *cancellable;
+ guint watchdog_id;
+
+ GTask *task;
+};
+
+G_DEFINE_TYPE_WITH_PRIVATE (ShellMimeSniffer, shell_mime_sniffer, G_TYPE_OBJECT);
+
+static void deep_count_load (DeepCountState *state,
+ GFile *file);
+
+static void
+init_mimetypes (void)
+{
+ static gsize once_init = 0;
+
+ if (g_once_init_enter (&once_init))
+ {
+ GSList *formats, *l;
+ GdkPixbufFormat *format;
+ gchar **types;
+ gint idx;
+
+ image_type_table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, NULL);
+ video_type_table = g_hash_table_new (g_str_hash, g_str_equal);
+ audio_type_table = g_hash_table_new (g_str_hash, g_str_equal);
+ docs_type_table = g_hash_table_new (g_str_hash, g_str_equal);
+
+ formats = gdk_pixbuf_get_formats ();
+
+ for (l = formats; l != NULL; l = l->next)
+ {
+ format = l->data;
+ types = gdk_pixbuf_format_get_mime_types (format);
+
+ for (idx = 0; types[idx] != NULL; idx++)
+ g_hash_table_insert (image_type_table, g_strdup (types[idx]), GINT_TO_POINTER (1));
+
+ g_strfreev (types);
+ }
+
+ g_slist_free (formats);
+
+ for (idx = 0; audio_mimetypes[idx] != NULL; idx++)
+ g_hash_table_insert (audio_type_table, (gpointer) audio_mimetypes[idx], GINT_TO_POINTER (1));
+
+ for (idx = 0; video_mimetypes[idx] != NULL; idx++)
+ g_hash_table_insert (video_type_table, (gpointer) video_mimetypes[idx], GINT_TO_POINTER (1));
+
+ for (idx = 0; docs_mimetypes[idx] != NULL; idx++)
+ g_hash_table_insert (docs_type_table, (gpointer) docs_mimetypes[idx], GINT_TO_POINTER (1));
+
+ g_once_init_leave (&once_init, 1);
+ }
+}
+
+static void
+add_content_type_to_cache (DeepCountState *state,
+ const gchar *content_type)
+{
+ gboolean matched = TRUE;
+
+ if (g_hash_table_lookup (image_type_table, content_type))
+ state->image_count++;
+ else if (g_hash_table_lookup (video_type_table, content_type))
+ state->video_count++;
+ else if (g_hash_table_lookup (docs_type_table, content_type))
+ state->document_count++;
+ else if (g_hash_table_lookup (audio_type_table, content_type))
+ state->audio_count++;
+ else
+ matched = FALSE;
+
+ if (matched)
+ state->total_items++;
+}
+
+typedef struct {
+ const gchar *type;
+ gdouble ratio;
+} SniffedResult;
+
+static gint
+results_cmp_func (gconstpointer a,
+ gconstpointer b)
+{
+ const SniffedResult *sniffed_a = a;
+ const SniffedResult *sniffed_b = b;
+
+ if (sniffed_a->ratio < sniffed_b->ratio)
+ return 1;
+
+ if (sniffed_a->ratio > sniffed_b->ratio)
+ return -1;
+
+ return 0;
+}
+
+static void
+prepare_async_result (DeepCountState *state)
+{
+ ShellMimeSniffer *self = state->self;
+ GArray *results;
+ GPtrArray *sniffed_mime;
+ SniffedResult result;
+ char **mimes;
+
+ sniffed_mime = g_ptr_array_new ();
+ results = g_array_new (TRUE, TRUE, sizeof (SniffedResult));
+
+ if (state->total_items == 0)
+ goto out;
+
+ result.type = "x-content/video";
+ result.ratio = (gdouble) state->video_count / (gdouble) state->total_items;
+ g_array_append_val (results, result);
+
+ result.type = "x-content/audio";
+ result.ratio = (gdouble) state->audio_count / (gdouble) state->total_items;
+ g_array_append_val (results, result);
+
+ result.type = "x-content/pictures";
+ result.ratio = (gdouble) state->image_count / (gdouble) state->total_items;
+ g_array_append_val (results, result);
+
+ result.type = "x-content/documents";
+ result.ratio = (gdouble) state->document_count / (gdouble) state->total_items;
+ g_array_append_val (results, result);
+
+ g_array_sort (results, results_cmp_func);
+
+ result = g_array_index (results, SniffedResult, 0);
+ g_ptr_array_add (sniffed_mime, g_strdup (result.type));
+
+ /* if other types score high in ratio, add them, up to three */
+ result = g_array_index (results, SniffedResult, 1);
+ if (result.ratio < HIGH_SCORE_RATIO)
+ goto out;
+ g_ptr_array_add (sniffed_mime, g_strdup (result.type));
+
+ result = g_array_index (results, SniffedResult, 2);
+ if (result.ratio < HIGH_SCORE_RATIO)
+ goto out;
+ g_ptr_array_add (sniffed_mime, g_strdup (result.type));
+
+ out:
+ g_ptr_array_add (sniffed_mime, NULL);
+ mimes = (gchar **) g_ptr_array_free (sniffed_mime, FALSE);
+
+ g_array_free (results, TRUE);
+ g_task_return_pointer (self->priv->task, mimes, (GDestroyNotify)g_strfreev);
+}
+
+/* adapted from nautilus/libnautilus-private/nautilus-directory-async.c */
+static void
+deep_count_one (DeepCountState *state,
+ GFileInfo *info)
+{
+ GFile *subdir;
+ const char *content_type;
+
+ if (g_file_info_get_file_type (info) == G_FILE_TYPE_DIRECTORY)
+ {
+ /* record the fact that we have to descend into this directory */
+ subdir = g_file_get_child (state->file, g_file_info_get_name (info));
+ state->deep_count_subdirectories =
+ g_list_append (state->deep_count_subdirectories, subdir);
+ }
+ else
+ {
+ content_type = g_file_info_get_content_type (info);
+
+ if (content_type)
+ add_content_type_to_cache (state, content_type);
+ }
+}
+
+static void
+deep_count_finish (DeepCountState *state)
+{
+ prepare_async_result (state);
+
+ if (state->enumerator)
+ {
+ if (!g_file_enumerator_is_closed (state->enumerator))
+ g_file_enumerator_close_async (state->enumerator,
+ 0, NULL, NULL, NULL);
+
+ g_object_unref (state->enumerator);
+ }
+
+ g_cancellable_reset (state->self->priv->cancellable);
+ g_clear_object (&state->file);
+
+ g_list_free_full (state->deep_count_subdirectories, g_object_unref);
+
+ g_free (state);
+}
+
+static void
+deep_count_next_dir (DeepCountState *state)
+{
+ GFile *new_file;
+
+ g_clear_object (&state->file);
+
+ if (state->deep_count_subdirectories != NULL)
+ {
+ /* Work on a new directory. */
+ new_file = state->deep_count_subdirectories->data;
+ state->deep_count_subdirectories =
+ g_list_remove (state->deep_count_subdirectories, new_file);
+
+ deep_count_load (state, new_file);
+ g_object_unref (new_file);
+ }
+ else
+ {
+ deep_count_finish (state);
+ }
+}
+
+static void
+deep_count_more_files_callback (GObject *source_object,
+ GAsyncResult *res,
+ gpointer user_data)
+{
+ DeepCountState *state;
+ GList *files, *l;
+ GFileInfo *info;
+
+ state = user_data;
+
+ if (g_cancellable_is_cancelled (state->self->priv->cancellable))
+ {
+ deep_count_finish (state);
+ return;
+ }
+
+ files = g_file_enumerator_next_files_finish (state->enumerator,
+ res, NULL);
+
+ for (l = files; l != NULL; l = l->next)
+ {
+ info = l->data;
+ deep_count_one (state, info);
+ g_object_unref (info);
+ }
+
+ if (files == NULL)
+ {
+ g_file_enumerator_close_async (state->enumerator, 0, NULL, NULL, NULL);
+ g_object_unref (state->enumerator);
+ state->enumerator = NULL;
+
+ deep_count_next_dir (state);
+ }
+ else
+ {
+ g_file_enumerator_next_files_async (state->enumerator,
+ DIRECTORY_LOAD_ITEMS_PER_CALLBACK,
+ G_PRIORITY_LOW,
+ state->self->priv->cancellable,
+ deep_count_more_files_callback,
+ state);
+ }
+
+ g_list_free (files);
+}
+
+static void
+deep_count_callback (GObject *source_object,
+ GAsyncResult *res,
+ gpointer user_data)
+{
+ DeepCountState *state;
+ GFileEnumerator *enumerator;
+
+ state = user_data;
+
+ if (g_cancellable_is_cancelled (state->self->priv->cancellable))
+ {
+ deep_count_finish (state);
+ return;
+ }
+
+ enumerator = g_file_enumerate_children_finish (G_FILE (source_object),
+ res, NULL);
+
+ if (enumerator == NULL)
+ {
+ deep_count_next_dir (state);
+ }
+ else
+ {
+ state->enumerator = enumerator;
+ g_file_enumerator_next_files_async (state->enumerator,
+ DIRECTORY_LOAD_ITEMS_PER_CALLBACK,
+ G_PRIORITY_LOW,
+ state->self->priv->cancellable,
+ deep_count_more_files_callback,
+ state);
+ }
+}
+
+static void
+deep_count_load (DeepCountState *state,
+ GFile *file)
+{
+ state->file = g_object_ref (file);
+
+ g_file_enumerate_children_async (state->file,
+ LOADER_ATTRS,
+ G_FILE_QUERY_INFO_NOFOLLOW_SYMLINKS, /* flags */
+ G_PRIORITY_LOW, /* prio */
+ state->self->priv->cancellable,
+ deep_count_callback,
+ state);
+}
+
+static void
+deep_count_start (ShellMimeSniffer *self)
+{
+ DeepCountState *state;
+
+ state = g_new0 (DeepCountState, 1);
+ state->self = self;
+
+ deep_count_load (state, self->priv->file);
+}
+
+static void
+query_info_async_ready_cb (GObject *source,
+ GAsyncResult *res,
+ gpointer user_data)
+{
+ GFileInfo *info;
+ GError *error = NULL;
+ ShellMimeSniffer *self = user_data;
+
+ info = g_file_query_info_finish (G_FILE (source),
+ res, &error);
+
+ if (error != NULL)
+ {
+ g_task_return_error (self->priv->task, error);
+
+ return;
+ }
+
+ if (g_file_info_get_file_type (info) != G_FILE_TYPE_DIRECTORY)
+ {
+ g_task_return_new_error (self->priv->task,
+ G_IO_ERROR,
+ G_IO_ERROR_NOT_DIRECTORY,
+ "Not a directory");
+
+ return;
+ }
+
+ deep_count_start (self);
+}
+
+static gboolean
+watchdog_timeout_reached_cb (gpointer user_data)
+{
+ ShellMimeSniffer *self = user_data;
+
+ self->priv->watchdog_id = 0;
+ g_cancellable_cancel (self->priv->cancellable);
+
+ return FALSE;
+}
+
+static void
+start_loading_file (ShellMimeSniffer *self)
+{
+ g_file_query_info_async (self->priv->file,
+ LOADER_ATTRS,
+ G_FILE_QUERY_INFO_NONE,
+ G_PRIORITY_DEFAULT,
+ self->priv->cancellable,
+ query_info_async_ready_cb,
+ self);
+}
+
+static void
+shell_mime_sniffer_set_file (ShellMimeSniffer *self,
+ GFile *file)
+{
+ g_clear_object (&self->priv->file);
+ self->priv->file = g_object_ref (file);
+}
+
+static void
+shell_mime_sniffer_dispose (GObject *object)
+{
+ ShellMimeSniffer *self = SHELL_MIME_SNIFFER (object);
+
+ g_clear_object (&self->priv->file);
+ g_clear_object (&self->priv->cancellable);
+ g_clear_object (&self->priv->task);
+
+ g_clear_handle_id (&self->priv->watchdog_id, g_source_remove);
+
+ G_OBJECT_CLASS (shell_mime_sniffer_parent_class)->dispose (object);
+}
+
+static void
+shell_mime_sniffer_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ ShellMimeSniffer *self = SHELL_MIME_SNIFFER (object);
+
+ switch (prop_id) {
+ case PROP_FILE:
+ g_value_set_object (value, self->priv->file);
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+shell_mime_sniffer_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ ShellMimeSniffer *self = SHELL_MIME_SNIFFER (object);
+
+ switch (prop_id) {
+ case PROP_FILE:
+ shell_mime_sniffer_set_file (self, g_value_get_object (value));
+ break;
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+shell_mime_sniffer_class_init (ShellMimeSnifferClass *klass)
+{
+ GObjectClass *oclass;
+
+ oclass = G_OBJECT_CLASS (klass);
+ oclass->dispose = shell_mime_sniffer_dispose;
+ oclass->get_property = shell_mime_sniffer_get_property;
+ oclass->set_property = shell_mime_sniffer_set_property;
+
+ properties[PROP_FILE] =
+ g_param_spec_object ("file",
+ "File",
+ "The loaded file",
+ G_TYPE_FILE,
+ G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+
+ g_object_class_install_properties (oclass, NUM_PROPERTIES, properties);
+}
+
+static void
+shell_mime_sniffer_init (ShellMimeSniffer *self)
+{
+ self->priv = shell_mime_sniffer_get_instance_private (self);
+ init_mimetypes ();
+}
+
+ShellMimeSniffer *
+shell_mime_sniffer_new (GFile *file)
+{
+ return g_object_new (SHELL_TYPE_MIME_SNIFFER,
+ "file", file,
+ NULL);
+}
+
+void
+shell_mime_sniffer_sniff_async (ShellMimeSniffer *self,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ g_assert (self->priv->watchdog_id == 0);
+ g_assert (self->priv->task == NULL);
+
+ self->priv->cancellable = g_cancellable_new ();
+ self->priv->task = g_task_new (self, self->priv->cancellable,
+ callback, user_data);
+
+ self->priv->watchdog_id =
+ g_timeout_add (WATCHDOG_TIMEOUT,
+ watchdog_timeout_reached_cb, self);
+ g_source_set_name_by_id (self->priv->watchdog_id, "[gnome-shell] watchdog_timeout_reached_cb");
+
+ start_loading_file (self);
+}
+
+gchar **
+shell_mime_sniffer_sniff_finish (ShellMimeSniffer *self,
+ GAsyncResult *res,
+ GError **error)
+{
+ return g_task_propagate_pointer (self->priv->task, error);
+}
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