gio/gseekable.h

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #ifndef __G_SEEKABLE_H__
  24 #define __G_SEEKABLE_H__
  25
  26 #include <glib-object.h>
  27 #include <gio/gcancellable.h>
  28
  29 G_BEGIN_DECLS
  30
  31 #define G_TYPE_SEEKABLE            (g_seekable_get_type ())
  32 #define G_SEEKABLE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_SEEKABLE, GSeekable))
  33 #define G_IS_SEEKABLE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), G_TYPE_SEEKABLE))
  34 #define G_SEEKABLE_GET_IFACE(obj)  (G_TYPE_INSTANCE_GET_INTERFACE ((obj), G_TYPE_SEEKABLE, GSeekableIface))
  35
  36 typedef struct _GSeekable        GSeekable;
  37 typedef struct _GSeekableIface   GSeekableIface;
  38
  39 struct _GSeekableIface
  40 {
  41   GTypeInterface g_iface;
  42
  43   /* Virtual Table */
  44
  45   goffset     (* tell)           (GSeekable    *seekable);
  46
  47   gboolean    (* can_seek)       (GSeekable    *seekable);
  48   gboolean    (* seek)           (GSeekable    *seekable,
  49                                   goffset       offset,
  50                                   GSeekType     type,
  51                                   GCancellable *cancellable,
  52                                   GError      **error);
  53
  54   gboolean    (* can_truncate)   (GSeekable    *seekable);
  55   gboolean    (* truncate)       (GSeekable    *seekable,
  56                                   goffset       offset,
  57                                   GCancellable *cancellable,
  58                                   GError       **error);
  59
  60   /* TODO: Async seek/truncate */
  61 };
  62
  63 GType g_seekable_get_type (void) G_GNUC_CONST;
  64
  65 goffset  g_seekable_tell         (GSeekable     *seekable);
  66 gboolean g_seekable_can_seek     (GSeekable     *seekable);
  67 gboolean g_seekable_seek         (GSeekable     *seekable,
  68                                   goffset        offset,
  69                                   GSeekType      type,
  70                                   GCancellable  *cancellable,
  71                                   GError       **error);
  72 gboolean g_seekable_can_truncate (GSeekable     *seekable);
  73 gboolean g_seekable_truncate     (GSeekable     *seekable,
  74                                   goffset        offset,
  75                                   GCancellable  *cancellable,
  76                                   GError       **error);
  77
  78 G_END_DECLS
  79
  80
  81 #endif /* __G_SEEKABLE_H__ */