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glib/gio/gfilterinputstream.c

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/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Christian Kellner <gicmo@gnome.org>
*/
#include "config.h"
#include "gfilterinputstream.h"
#include "ginputstream.h"
#include "glibintl.h"
/**
* SECTION:gfilterinputstream
* @short_description: Filter Input Stream
* @include: gio/gio.h
*
* Base class for input stream implementations that perform some
* kind of filtering operation on a base stream. Typical examples
* of filtering operations are character set conversion, compression
* and byte order flipping.
**/
enum {
PROP_0,
PROP_BASE_STREAM,
PROP_CLOSE_BASE
};
static void g_filter_input_stream_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec);
static void g_filter_input_stream_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec);
static void g_filter_input_stream_finalize (GObject *object);
static gssize g_filter_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error);
static gssize g_filter_input_stream_skip (GInputStream *stream,
gsize count,
GCancellable *cancellable,
GError **error);
static gboolean g_filter_input_stream_close (GInputStream *stream,
GCancellable *cancellable,
GError **error);
G_DEFINE_ABSTRACT_TYPE (GFilterInputStream, g_filter_input_stream, G_TYPE_INPUT_STREAM)
#define GET_PRIVATE(inst) G_TYPE_INSTANCE_GET_PRIVATE (inst, \
G_TYPE_FILTER_INPUT_STREAM, GFilterInputStreamPrivate)
typedef struct
{
gboolean close_base;
} GFilterInputStreamPrivate;
static void
g_filter_input_stream_class_init (GFilterInputStreamClass *klass)
{
GObjectClass *object_class;
GInputStreamClass *istream_class;
object_class = G_OBJECT_CLASS (klass);
object_class->get_property = g_filter_input_stream_get_property;
object_class->set_property = g_filter_input_stream_set_property;
object_class->finalize = g_filter_input_stream_finalize;
istream_class = G_INPUT_STREAM_CLASS (klass);
istream_class->read_fn = g_filter_input_stream_read;
istream_class->skip = g_filter_input_stream_skip;
istream_class->close_fn = g_filter_input_stream_close;
g_type_class_add_private (klass, sizeof (GFilterInputStreamPrivate));
g_object_class_install_property (object_class,
PROP_BASE_STREAM,
g_param_spec_object ("base-stream",
P_("The Filter Base Stream"),
P_("The underlying base stream on which the io ops will be done."),
G_TYPE_INPUT_STREAM,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
g_object_class_install_property (object_class,
PROP_CLOSE_BASE,
g_param_spec_boolean ("close-base-stream",
P_("Close Base Stream"),
P_("If the base stream should be closed when the filter stream is closed."),
TRUE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
}
static void
g_filter_input_stream_set_property (GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GFilterInputStream *filter_stream;
GObject *obj;
filter_stream = G_FILTER_INPUT_STREAM (object);
switch (prop_id)
{
case PROP_BASE_STREAM:
obj = g_value_dup_object (value);
filter_stream->base_stream = G_INPUT_STREAM (obj);
break;
case PROP_CLOSE_BASE:
g_filter_input_stream_set_close_base_stream (filter_stream,
g_value_get_boolean (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_filter_input_stream_get_property (GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GFilterInputStream *filter_stream;
filter_stream = G_FILTER_INPUT_STREAM (object);
switch (prop_id)
{
case PROP_BASE_STREAM:
g_value_set_object (value, filter_stream->base_stream);
break;
case PROP_CLOSE_BASE:
g_value_set_boolean (value, GET_PRIVATE (filter_stream)->close_base);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
g_filter_input_stream_finalize (GObject *object)
{
GFilterInputStream *stream;
stream = G_FILTER_INPUT_STREAM (object);
g_object_unref (stream->base_stream);
G_OBJECT_CLASS (g_filter_input_stream_parent_class)->finalize (object);
}
static void
g_filter_input_stream_init (GFilterInputStream *stream)
{
}
/**
* g_filter_input_stream_get_base_stream:
* @stream: a #GFilterInputStream.
*
* Gets the base stream for the filter stream.
*
* Returns: (transfer none): a #GInputStream.
**/
GInputStream *
g_filter_input_stream_get_base_stream (GFilterInputStream *stream)
{
g_return_val_if_fail (G_IS_FILTER_INPUT_STREAM (stream), NULL);
return stream->base_stream;
}
/**
* g_filter_input_stream_get_close_base_stream:
* @stream: a #GFilterInputStream.
*
* Returns whether the base stream will be closed when @stream is
* closed.
*
* Return value: %TRUE if the base stream will be closed.
**/
gboolean
g_filter_input_stream_get_close_base_stream (GFilterInputStream *stream)
{
g_return_val_if_fail (G_IS_FILTER_INPUT_STREAM (stream), FALSE);
return GET_PRIVATE (stream)->close_base;
}
/**
* g_filter_input_stream_set_close_base_stream:
* @stream: a #GFilterInputStream.
* @close_base: %TRUE to close the base stream.
*
* Sets whether the base stream will be closed when @stream is closed.
**/
void
g_filter_input_stream_set_close_base_stream (GFilterInputStream *stream,
gboolean close_base)
{
GFilterInputStreamPrivate *priv;
g_return_if_fail (G_IS_FILTER_INPUT_STREAM (stream));
close_base = !!close_base;
priv = GET_PRIVATE (stream);
if (priv->close_base != close_base)
{
priv->close_base = close_base;
g_object_notify (G_OBJECT (stream), "close-base-stream");
}
}
static gssize
g_filter_input_stream_read (GInputStream *stream,
void *buffer,
gsize count,
GCancellable *cancellable,
GError **error)
{
GFilterInputStream *filter_stream;
GInputStream *base_stream;
gssize nread;
filter_stream = G_FILTER_INPUT_STREAM (stream);
base_stream = filter_stream->base_stream;
nread = g_input_stream_read (base_stream,
buffer,
count,
cancellable,
error);
return nread;
}
static gssize
g_filter_input_stream_skip (GInputStream *stream,
gsize count,
GCancellable *cancellable,
GError **error)
{
GFilterInputStream *filter_stream;
GInputStream *base_stream;
gssize nskipped;
filter_stream = G_FILTER_INPUT_STREAM (stream);
base_stream = filter_stream->base_stream;
nskipped = g_input_stream_skip (base_stream,
count,
cancellable,
error);
return nskipped;
}
static gboolean
g_filter_input_stream_close (GInputStream *stream,
GCancellable *cancellable,
GError **error)
{
gboolean res = TRUE;
if (GET_PRIVATE (stream)->close_base)
{
GFilterInputStream *filter_stream;
GInputStream *base_stream;
filter_stream = G_FILTER_INPUT_STREAM (stream);
base_stream = filter_stream->base_stream;
res = g_input_stream_close (base_stream,
cancellable,
error);
}
return res;
}
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