1 /* GIO - GLib Input, Output and Streaming Library
3 * Copyright (C) 2006-2007 Red Hat, Inc.
5 * SPDX-License-Identifier: LGPL-2.1-or-later
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General
18 * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 * Author: Alexander Larsson <alexl@redhat.com>
23 #ifndef __G_SEEKABLE_H__
24 #define __G_SEEKABLE_H__
26 #if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
27 #error "Only <gio/gio.h> can be included directly."
30 #include <gio/giotypes.h>
34 #define G_TYPE_SEEKABLE (g_seekable_get_type ())
35 #define G_SEEKABLE(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_SEEKABLE, GSeekable))
36 #define G_IS_SEEKABLE(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), G_TYPE_SEEKABLE))
37 #define G_SEEKABLE_GET_IFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), G_TYPE_SEEKABLE, GSeekableIface))
42 * Seek object for streaming operations.
44 typedef struct _GSeekableIface GSeekableIface;
48 * @g_iface: The parent interface.
49 * @tell: Tells the current location within a stream.
50 * @can_seek: Checks if seeking is supported by the stream.
51 * @seek: Seeks to a location within a stream.
52 * @can_truncate: Checks if truncation is supported by the stream.
53 * @truncate_fn: Truncates a stream.
55 * Provides an interface for implementing seekable functionality on I/O Streams.
57 struct _GSeekableIface
59 GTypeInterface g_iface;
63 goffset (* tell) (GSeekable *seekable);
65 gboolean (* can_seek) (GSeekable *seekable);
66 gboolean (* seek) (GSeekable *seekable,
69 GCancellable *cancellable,
72 gboolean (* can_truncate) (GSeekable *seekable);
73 gboolean (* truncate_fn) (GSeekable *seekable,
75 GCancellable *cancellable,
78 /* TODO: Async seek/truncate */
82 GType g_seekable_get_type (void) G_GNUC_CONST;
85 goffset g_seekable_tell (GSeekable *seekable);
87 gboolean g_seekable_can_seek (GSeekable *seekable);
89 gboolean g_seekable_seek (GSeekable *seekable,
92 GCancellable *cancellable,
95 gboolean g_seekable_can_truncate (GSeekable *seekable);
97 gboolean g_seekable_truncate (GSeekable *seekable,
99 GCancellable *cancellable,
105 #endif /* __G_SEEKABLE_H__ */