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39cd766e8e
Note: Since we export types with Iface in the name rather than Interface we have to use some typedefs to make this work. New interfaces should probably use Interface as the public name.
180 lines
4.8 KiB
C
180 lines
4.8 KiB
C
/* 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 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307, USA.
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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 "gseekable.h"
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#include "glibintl.h"
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#include "gioalias.h"
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/**
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* SECTION:gseekable
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* @short_description: Stream seeking interface
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* @include: gio/gio.h
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* @see_also: #GInputStream, #GOutputStream
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*
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* #GSeekable is implemented by streams (implementations of
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* #GInputStream or #GOutputStream) that support seeking.
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*
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**/
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typedef GSeekableIface GSeekableInterface;
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G_DEFINE_INTERFACE (GSeekable, g_seekable, G_TYPE_OBJECT)
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static void
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g_seekable_default_init (GSeekableInterface *iface)
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{
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}
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/**
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* g_seekable_tell:
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* @seekable: a #GSeekable.
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*
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* Tells the current position within the stream.
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*
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* Returns: the offset from the beginning of the buffer.
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**/
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goffset
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g_seekable_tell (GSeekable *seekable)
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{
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GSeekableIface *iface;
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g_return_val_if_fail (G_IS_SEEKABLE (seekable), 0);
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iface = G_SEEKABLE_GET_IFACE (seekable);
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return (* iface->tell) (seekable);
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}
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/**
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* g_seekable_can_seek:
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* @seekable: a #GSeekable.
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*
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* Tests if the stream supports the #GSeekableIface.
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*
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* Returns: %TRUE if @seekable can be seeked. %FALSE otherwise.
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**/
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gboolean
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g_seekable_can_seek (GSeekable *seekable)
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{
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GSeekableIface *iface;
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g_return_val_if_fail (G_IS_SEEKABLE (seekable), FALSE);
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iface = G_SEEKABLE_GET_IFACE (seekable);
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return (* iface->can_seek) (seekable);
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}
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/**
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* g_seekable_seek:
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* @seekable: a #GSeekable.
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* @offset: a #goffset.
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* @type: a #GSeekType.
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* @cancellable: optional #GCancellable object, %NULL to ignore.
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* @error: a #GError location to store the error occuring, or %NULL to
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* ignore.
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*
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* Seeks in the stream by the given @offset, modified by @type.
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*
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* If @cancellable is not %NULL, then the operation can be cancelled by
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* triggering the cancellable object from another thread. If the operation
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* was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.
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*
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* Returns: %TRUE if successful. If an error
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* has occurred, this function will return %FALSE and set @error
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* appropriately if present.
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**/
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gboolean
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g_seekable_seek (GSeekable *seekable,
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goffset offset,
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GSeekType type,
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GCancellable *cancellable,
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GError **error)
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{
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GSeekableIface *iface;
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g_return_val_if_fail (G_IS_SEEKABLE (seekable), FALSE);
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iface = G_SEEKABLE_GET_IFACE (seekable);
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return (* iface->seek) (seekable, offset, type, cancellable, error);
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}
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/**
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* g_seekable_can_truncate:
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* @seekable: a #GSeekable.
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*
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* Tests if the stream can be truncated.
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*
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* Returns: %TRUE if the stream can be truncated, %FALSE otherwise.
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**/
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gboolean
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g_seekable_can_truncate (GSeekable *seekable)
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{
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GSeekableIface *iface;
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g_return_val_if_fail (G_IS_SEEKABLE (seekable), FALSE);
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iface = G_SEEKABLE_GET_IFACE (seekable);
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return (* iface->can_truncate) (seekable);
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}
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/**
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* g_seekable_truncate:
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* @seekable: a #GSeekable.
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* @offset: a #goffset.
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* @cancellable: optional #GCancellable object, %NULL to ignore.
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* @error: a #GError location to store the error occuring, or %NULL to
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* ignore.
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*
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* Truncates a stream with a given #offset.
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*
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* If @cancellable is not %NULL, then the operation can be cancelled by
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* triggering the cancellable object from another thread. If the operation
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* was cancelled, the error %G_IO_ERROR_CANCELLED will be returned. If an
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* operation was partially finished when the operation was cancelled the
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* partial result will be returned, without an error.
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*
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* Returns: %TRUE if successful. If an error
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* has occurred, this function will return %FALSE and set @error
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* appropriately if present.
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**/
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gboolean
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g_seekable_truncate (GSeekable *seekable,
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goffset offset,
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GCancellable *cancellable,
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GError **error)
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{
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GSeekableIface *iface;
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g_return_val_if_fail (G_IS_SEEKABLE (seekable), FALSE);
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iface = G_SEEKABLE_GET_IFACE (seekable);
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return (* iface->truncate_fn) (seekable, offset, cancellable, error);
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}
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#define __G_SEEKABLE_C__
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#include "gioaliasdef.c"
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