Import Upstream version 2.72.4
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511
gio/gvfs.c
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511
gio/gvfs.c
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/* GIO - GLib Input, Output and Streaming Library
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*
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* Copyright (C) 2006-2007 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General
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* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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* Author: Alexander Larsson <alexl@redhat.com>
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*/
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#include "config.h"
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#include <string.h>
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#include "gvfs.h"
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#include "glib-private.h"
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#include "glocalvfs.h"
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#include "gresourcefile.h"
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#include "giomodule-priv.h"
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#include "glibintl.h"
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/**
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* SECTION:gvfs
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* @short_description: Virtual File System
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* @include: gio/gio.h
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*
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* Entry point for using GIO functionality.
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*
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*/
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static GRWLock additional_schemes_lock;
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typedef struct _GVfsPrivate {
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GHashTable *additional_schemes;
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char const **supported_schemes;
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} GVfsPrivate;
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typedef struct {
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GVfsFileLookupFunc uri_func;
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gpointer uri_data;
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GDestroyNotify uri_destroy;
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GVfsFileLookupFunc parse_name_func;
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gpointer parse_name_data;
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GDestroyNotify parse_name_destroy;
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} GVfsURISchemeData;
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G_DEFINE_TYPE_WITH_PRIVATE (GVfs, g_vfs, G_TYPE_OBJECT)
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static void
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g_vfs_dispose (GObject *object)
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{
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GVfs *vfs = G_VFS (object);
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GVfsPrivate *priv = g_vfs_get_instance_private (vfs);
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g_clear_pointer (&priv->additional_schemes, g_hash_table_destroy);
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g_clear_pointer (&priv->supported_schemes, g_free);
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G_OBJECT_CLASS (g_vfs_parent_class)->dispose (object);
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}
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static void
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g_vfs_class_init (GVfsClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->dispose = g_vfs_dispose;
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}
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static GFile *
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resource_parse_name (GVfs *vfs,
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const char *parse_name,
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gpointer user_data)
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{
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if (g_str_has_prefix (parse_name, "resource:"))
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return _g_resource_file_new (parse_name);
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return NULL;
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}
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static GFile *
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resource_get_file_for_uri (GVfs *vfs,
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const char *uri,
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gpointer user_data)
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{
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return _g_resource_file_new (uri);
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}
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static void
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g_vfs_uri_lookup_func_closure_free (gpointer data)
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{
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GVfsURISchemeData *closure = data;
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if (closure->uri_destroy)
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closure->uri_destroy (closure->uri_data);
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if (closure->parse_name_destroy)
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closure->parse_name_destroy (closure->parse_name_data);
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g_free (closure);
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}
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static void
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g_vfs_init (GVfs *vfs)
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{
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GVfsPrivate *priv = g_vfs_get_instance_private (vfs);
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priv->additional_schemes =
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g_hash_table_new_full (g_str_hash, g_str_equal,
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g_free, g_vfs_uri_lookup_func_closure_free);
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g_vfs_register_uri_scheme (vfs, "resource",
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resource_get_file_for_uri, NULL, NULL,
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resource_parse_name, NULL, NULL);
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}
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/**
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* g_vfs_is_active:
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* @vfs: a #GVfs.
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*
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* Checks if the VFS is active.
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*
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* Returns: %TRUE if construction of the @vfs was successful
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* and it is now active.
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*/
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gboolean
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g_vfs_is_active (GVfs *vfs)
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{
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GVfsClass *class;
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g_return_val_if_fail (G_IS_VFS (vfs), FALSE);
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class = G_VFS_GET_CLASS (vfs);
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return (* class->is_active) (vfs);
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}
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/**
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* g_vfs_get_file_for_path:
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* @vfs: a #GVfs.
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* @path: a string containing a VFS path.
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*
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* Gets a #GFile for @path.
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*
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* Returns: (transfer full): a #GFile.
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* Free the returned object with g_object_unref().
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*/
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GFile *
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g_vfs_get_file_for_path (GVfs *vfs,
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const char *path)
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{
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GVfsClass *class;
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g_return_val_if_fail (G_IS_VFS (vfs), NULL);
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g_return_val_if_fail (path != NULL, NULL);
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class = G_VFS_GET_CLASS (vfs);
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return (* class->get_file_for_path) (vfs, path);
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}
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static GFile *
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parse_name_internal (GVfs *vfs,
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const char *parse_name)
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{
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GVfsPrivate *priv = g_vfs_get_instance_private (vfs);
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GHashTableIter iter;
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GVfsURISchemeData *closure;
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GFile *ret = NULL;
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g_rw_lock_reader_lock (&additional_schemes_lock);
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g_hash_table_iter_init (&iter, priv->additional_schemes);
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while (g_hash_table_iter_next (&iter, NULL, (gpointer *) &closure))
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{
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ret = closure->parse_name_func (vfs, parse_name,
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closure->parse_name_data);
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if (ret)
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break;
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}
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g_rw_lock_reader_unlock (&additional_schemes_lock);
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return ret;
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}
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static GFile *
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get_file_for_uri_internal (GVfs *vfs,
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const char *uri)
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{
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GVfsPrivate *priv = g_vfs_get_instance_private (vfs);
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GFile *ret = NULL;
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char *scheme;
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GVfsURISchemeData *closure;
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scheme = g_uri_parse_scheme (uri);
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if (scheme == NULL)
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return NULL;
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g_rw_lock_reader_lock (&additional_schemes_lock);
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closure = g_hash_table_lookup (priv->additional_schemes, scheme);
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if (closure)
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ret = closure->uri_func (vfs, uri, closure->uri_data);
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g_rw_lock_reader_unlock (&additional_schemes_lock);
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g_free (scheme);
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return ret;
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}
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/**
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* g_vfs_get_file_for_uri:
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* @vfs: a#GVfs.
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* @uri: a string containing a URI
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*
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* Gets a #GFile for @uri.
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*
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* This operation never fails, but the returned object
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* might not support any I/O operation if the URI
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* is malformed or if the URI scheme is not supported.
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*
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* Returns: (transfer full): a #GFile.
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* Free the returned object with g_object_unref().
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*/
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GFile *
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g_vfs_get_file_for_uri (GVfs *vfs,
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const char *uri)
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{
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GVfsClass *class;
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GFile *ret = NULL;
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g_return_val_if_fail (G_IS_VFS (vfs), NULL);
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g_return_val_if_fail (uri != NULL, NULL);
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class = G_VFS_GET_CLASS (vfs);
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ret = get_file_for_uri_internal (vfs, uri);
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if (!ret)
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ret = (* class->get_file_for_uri) (vfs, uri);
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g_assert (ret != NULL);
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return g_steal_pointer (&ret);
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}
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/**
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* g_vfs_get_supported_uri_schemes:
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* @vfs: a #GVfs.
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*
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* Gets a list of URI schemes supported by @vfs.
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*
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* Returns: (transfer none): a %NULL-terminated array of strings.
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* The returned array belongs to GIO and must
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* not be freed or modified.
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*/
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const gchar * const *
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g_vfs_get_supported_uri_schemes (GVfs *vfs)
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{
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GVfsPrivate *priv;
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g_return_val_if_fail (G_IS_VFS (vfs), NULL);
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priv = g_vfs_get_instance_private (vfs);
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if (!priv->supported_schemes)
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{
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GVfsClass *class;
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const char * const *default_schemes;
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const char *additional_scheme;
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GPtrArray *supported_schemes;
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GHashTableIter iter;
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class = G_VFS_GET_CLASS (vfs);
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default_schemes = (* class->get_supported_uri_schemes) (vfs);
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supported_schemes = g_ptr_array_new ();
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for (; default_schemes && *default_schemes; default_schemes++)
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g_ptr_array_add (supported_schemes, (gpointer) *default_schemes);
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g_rw_lock_reader_lock (&additional_schemes_lock);
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g_hash_table_iter_init (&iter, priv->additional_schemes);
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while (g_hash_table_iter_next
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(&iter, (gpointer *) &additional_scheme, NULL))
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g_ptr_array_add (supported_schemes, (gpointer) additional_scheme);
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g_rw_lock_reader_unlock (&additional_schemes_lock);
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g_ptr_array_add (supported_schemes, NULL);
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g_free (priv->supported_schemes);
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priv->supported_schemes =
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(char const **) g_ptr_array_free (supported_schemes, FALSE);
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}
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return priv->supported_schemes;
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}
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/**
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* g_vfs_parse_name:
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* @vfs: a #GVfs.
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* @parse_name: a string to be parsed by the VFS module.
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*
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* This operation never fails, but the returned object might
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* not support any I/O operations if the @parse_name cannot
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* be parsed by the #GVfs module.
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*
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* Returns: (transfer full): a #GFile for the given @parse_name.
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* Free the returned object with g_object_unref().
|
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*/
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GFile *
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g_vfs_parse_name (GVfs *vfs,
|
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const char *parse_name)
|
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{
|
||||
GVfsClass *class;
|
||||
GFile *ret;
|
||||
|
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g_return_val_if_fail (G_IS_VFS (vfs), NULL);
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g_return_val_if_fail (parse_name != NULL, NULL);
|
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class = G_VFS_GET_CLASS (vfs);
|
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|
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ret = parse_name_internal (vfs, parse_name);
|
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if (ret)
|
||||
return ret;
|
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|
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return (* class->parse_name) (vfs, parse_name);
|
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}
|
||||
|
||||
static GVfs *vfs_default_singleton = NULL; /* (owned) (atomic) */
|
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|
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/**
|
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* g_vfs_get_default:
|
||||
*
|
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* Gets the default #GVfs for the system.
|
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*
|
||||
* Returns: (not nullable) (transfer none): a #GVfs, which will be the local
|
||||
* file system #GVfs if no other implementation is available.
|
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*/
|
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GVfs *
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g_vfs_get_default (void)
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{
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if (GLIB_PRIVATE_CALL (g_check_setuid) ())
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return g_vfs_get_local ();
|
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|
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if (g_once_init_enter (&vfs_default_singleton))
|
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{
|
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GVfs *singleton;
|
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|
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singleton = _g_io_module_get_default (G_VFS_EXTENSION_POINT_NAME,
|
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"GIO_USE_VFS",
|
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(GIOModuleVerifyFunc) g_vfs_is_active);
|
||||
|
||||
g_once_init_leave (&vfs_default_singleton, singleton);
|
||||
}
|
||||
|
||||
return vfs_default_singleton;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_vfs_get_local:
|
||||
*
|
||||
* Gets the local #GVfs for the system.
|
||||
*
|
||||
* Returns: (transfer none): a #GVfs.
|
||||
*/
|
||||
GVfs *
|
||||
g_vfs_get_local (void)
|
||||
{
|
||||
static gsize vfs = 0;
|
||||
|
||||
if (g_once_init_enter (&vfs))
|
||||
g_once_init_leave (&vfs, (gsize)_g_local_vfs_new ());
|
||||
|
||||
return G_VFS (vfs);
|
||||
}
|
||||
|
||||
/**
|
||||
* g_vfs_register_uri_scheme:
|
||||
* @vfs: a #GVfs
|
||||
* @scheme: an URI scheme, e.g. "http"
|
||||
* @uri_func: (scope notified) (nullable): a #GVfsFileLookupFunc
|
||||
* @uri_data: (nullable): custom data passed to be passed to @uri_func, or %NULL
|
||||
* @uri_destroy: (nullable): function to be called when unregistering the
|
||||
* URI scheme, or when @vfs is disposed, to free the resources used
|
||||
* by the URI lookup function
|
||||
* @parse_name_func: (scope notified) (nullable): a #GVfsFileLookupFunc
|
||||
* @parse_name_data: (nullable): custom data passed to be passed to
|
||||
* @parse_name_func, or %NULL
|
||||
* @parse_name_destroy: (nullable): function to be called when unregistering the
|
||||
* URI scheme, or when @vfs is disposed, to free the resources used
|
||||
* by the parse name lookup function
|
||||
*
|
||||
* Registers @uri_func and @parse_name_func as the #GFile URI and parse name
|
||||
* lookup functions for URIs with a scheme matching @scheme.
|
||||
* Note that @scheme is registered only within the running application, as
|
||||
* opposed to desktop-wide as it happens with GVfs backends.
|
||||
*
|
||||
* When a #GFile is requested with an URI containing @scheme (e.g. through
|
||||
* g_file_new_for_uri()), @uri_func will be called to allow a custom
|
||||
* constructor. The implementation of @uri_func should not be blocking, and
|
||||
* must not call g_vfs_register_uri_scheme() or g_vfs_unregister_uri_scheme().
|
||||
*
|
||||
* When g_file_parse_name() is called with a parse name obtained from such file,
|
||||
* @parse_name_func will be called to allow the #GFile to be created again. In
|
||||
* that case, it's responsibility of @parse_name_func to make sure the parse
|
||||
* name matches what the custom #GFile implementation returned when
|
||||
* g_file_get_parse_name() was previously called. The implementation of
|
||||
* @parse_name_func should not be blocking, and must not call
|
||||
* g_vfs_register_uri_scheme() or g_vfs_unregister_uri_scheme().
|
||||
*
|
||||
* It's an error to call this function twice with the same scheme. To unregister
|
||||
* a custom URI scheme, use g_vfs_unregister_uri_scheme().
|
||||
*
|
||||
* Returns: %TRUE if @scheme was successfully registered, or %FALSE if a handler
|
||||
* for @scheme already exists.
|
||||
*
|
||||
* Since: 2.50
|
||||
*/
|
||||
gboolean
|
||||
g_vfs_register_uri_scheme (GVfs *vfs,
|
||||
const char *scheme,
|
||||
GVfsFileLookupFunc uri_func,
|
||||
gpointer uri_data,
|
||||
GDestroyNotify uri_destroy,
|
||||
GVfsFileLookupFunc parse_name_func,
|
||||
gpointer parse_name_data,
|
||||
GDestroyNotify parse_name_destroy)
|
||||
{
|
||||
GVfsPrivate *priv;
|
||||
GVfsURISchemeData *closure;
|
||||
|
||||
g_return_val_if_fail (G_IS_VFS (vfs), FALSE);
|
||||
g_return_val_if_fail (scheme != NULL, FALSE);
|
||||
|
||||
priv = g_vfs_get_instance_private (vfs);
|
||||
|
||||
g_rw_lock_reader_lock (&additional_schemes_lock);
|
||||
closure = g_hash_table_lookup (priv->additional_schemes, scheme);
|
||||
g_rw_lock_reader_unlock (&additional_schemes_lock);
|
||||
|
||||
if (closure != NULL)
|
||||
return FALSE;
|
||||
|
||||
closure = g_new0 (GVfsURISchemeData, 1);
|
||||
closure->uri_func = uri_func;
|
||||
closure->uri_data = uri_data;
|
||||
closure->uri_destroy = uri_destroy;
|
||||
closure->parse_name_func = parse_name_func;
|
||||
closure->parse_name_data = parse_name_data;
|
||||
closure->parse_name_destroy = parse_name_destroy;
|
||||
|
||||
g_rw_lock_writer_lock (&additional_schemes_lock);
|
||||
g_hash_table_insert (priv->additional_schemes, g_strdup (scheme), closure);
|
||||
g_rw_lock_writer_unlock (&additional_schemes_lock);
|
||||
|
||||
/* Invalidate supported schemes */
|
||||
g_clear_pointer (&priv->supported_schemes, g_free);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
/**
|
||||
* g_vfs_unregister_uri_scheme:
|
||||
* @vfs: a #GVfs
|
||||
* @scheme: an URI scheme, e.g. "http"
|
||||
*
|
||||
* Unregisters the URI handler for @scheme previously registered with
|
||||
* g_vfs_register_uri_scheme().
|
||||
*
|
||||
* Returns: %TRUE if @scheme was successfully unregistered, or %FALSE if a
|
||||
* handler for @scheme does not exist.
|
||||
*
|
||||
* Since: 2.50
|
||||
*/
|
||||
gboolean
|
||||
g_vfs_unregister_uri_scheme (GVfs *vfs,
|
||||
const char *scheme)
|
||||
{
|
||||
GVfsPrivate *priv;
|
||||
gboolean res;
|
||||
|
||||
g_return_val_if_fail (G_IS_VFS (vfs), FALSE);
|
||||
g_return_val_if_fail (scheme != NULL, FALSE);
|
||||
|
||||
priv = g_vfs_get_instance_private (vfs);
|
||||
|
||||
g_rw_lock_writer_lock (&additional_schemes_lock);
|
||||
res = g_hash_table_remove (priv->additional_schemes, scheme);
|
||||
g_rw_lock_writer_unlock (&additional_schemes_lock);
|
||||
|
||||
if (res)
|
||||
{
|
||||
/* Invalidate supported schemes */
|
||||
g_clear_pointer (&priv->supported_schemes, g_free);
|
||||
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
return FALSE;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue