Import Upstream version 2.72.4
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gio/gfilteroutputstream.c
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308
gio/gfilteroutputstream.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: Christian Kellner <gicmo@gnome.org>
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*/
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#include "config.h"
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#include "gfilteroutputstream.h"
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#include "goutputstream.h"
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#include "glibintl.h"
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/**
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* SECTION:gfilteroutputstream
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* @short_description: Filter Output Stream
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* @include: gio/gio.h
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*
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* Base class for output stream implementations that perform some
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* kind of filtering operation on a base stream. Typical examples
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* of filtering operations are character set conversion, compression
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* and byte order flipping.
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*/
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enum {
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PROP_0,
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PROP_BASE_STREAM,
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PROP_CLOSE_BASE
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};
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static void g_filter_output_stream_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec);
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static void g_filter_output_stream_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec);
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static void g_filter_output_stream_dispose (GObject *object);
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static gssize g_filter_output_stream_write (GOutputStream *stream,
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const void *buffer,
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gsize count,
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GCancellable *cancellable,
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GError **error);
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static gboolean g_filter_output_stream_flush (GOutputStream *stream,
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GCancellable *cancellable,
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GError **error);
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static gboolean g_filter_output_stream_close (GOutputStream *stream,
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GCancellable *cancellable,
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GError **error);
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typedef struct
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{
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gboolean close_base;
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} GFilterOutputStreamPrivate;
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G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GFilterOutputStream, g_filter_output_stream, G_TYPE_OUTPUT_STREAM)
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static void
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g_filter_output_stream_class_init (GFilterOutputStreamClass *klass)
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{
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GObjectClass *object_class;
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GOutputStreamClass *ostream_class;
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object_class = G_OBJECT_CLASS (klass);
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object_class->get_property = g_filter_output_stream_get_property;
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object_class->set_property = g_filter_output_stream_set_property;
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object_class->dispose = g_filter_output_stream_dispose;
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ostream_class = G_OUTPUT_STREAM_CLASS (klass);
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ostream_class->write_fn = g_filter_output_stream_write;
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ostream_class->flush = g_filter_output_stream_flush;
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ostream_class->close_fn = g_filter_output_stream_close;
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g_object_class_install_property (object_class,
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PROP_BASE_STREAM,
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g_param_spec_object ("base-stream",
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P_("The Filter Base Stream"),
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P_("The underlying base stream on which the io ops will be done."),
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G_TYPE_OUTPUT_STREAM,
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G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
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g_object_class_install_property (object_class,
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PROP_CLOSE_BASE,
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g_param_spec_boolean ("close-base-stream",
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P_("Close Base Stream"),
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P_("If the base stream should be closed when the filter stream is closed."),
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TRUE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY |
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G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
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}
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static void
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g_filter_output_stream_set_property (GObject *object,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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GFilterOutputStream *filter_stream;
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GObject *obj;
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filter_stream = G_FILTER_OUTPUT_STREAM (object);
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switch (prop_id)
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{
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case PROP_BASE_STREAM:
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obj = g_value_dup_object (value);
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filter_stream->base_stream = G_OUTPUT_STREAM (obj);
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break;
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case PROP_CLOSE_BASE:
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g_filter_output_stream_set_close_base_stream (filter_stream,
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g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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g_filter_output_stream_get_property (GObject *object,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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GFilterOutputStream *filter_stream;
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GFilterOutputStreamPrivate *priv;
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filter_stream = G_FILTER_OUTPUT_STREAM (object);
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priv = g_filter_output_stream_get_instance_private (filter_stream);
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switch (prop_id)
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{
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case PROP_BASE_STREAM:
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g_value_set_object (value, filter_stream->base_stream);
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break;
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case PROP_CLOSE_BASE:
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g_value_set_boolean (value, priv->close_base);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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g_filter_output_stream_dispose (GObject *object)
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{
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GFilterOutputStream *stream;
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stream = G_FILTER_OUTPUT_STREAM (object);
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G_OBJECT_CLASS (g_filter_output_stream_parent_class)->dispose (object);
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if (stream->base_stream)
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{
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g_object_unref (stream->base_stream);
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stream->base_stream = NULL;
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}
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}
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static void
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g_filter_output_stream_init (GFilterOutputStream *stream)
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{
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}
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/**
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* g_filter_output_stream_get_base_stream:
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* @stream: a #GFilterOutputStream.
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*
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* Gets the base stream for the filter stream.
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*
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* Returns: (transfer none): a #GOutputStream.
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**/
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GOutputStream *
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g_filter_output_stream_get_base_stream (GFilterOutputStream *stream)
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{
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g_return_val_if_fail (G_IS_FILTER_OUTPUT_STREAM (stream), NULL);
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return stream->base_stream;
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}
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/**
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* g_filter_output_stream_get_close_base_stream:
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* @stream: a #GFilterOutputStream.
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*
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* Returns whether the base stream will be closed when @stream is
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* closed.
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*
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* Returns: %TRUE if the base stream will be closed.
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**/
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gboolean
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g_filter_output_stream_get_close_base_stream (GFilterOutputStream *stream)
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{
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GFilterOutputStreamPrivate *priv;
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g_return_val_if_fail (G_IS_FILTER_OUTPUT_STREAM (stream), FALSE);
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priv = g_filter_output_stream_get_instance_private (stream);
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return priv->close_base;
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}
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/**
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* g_filter_output_stream_set_close_base_stream:
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* @stream: a #GFilterOutputStream.
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* @close_base: %TRUE to close the base stream.
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*
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* Sets whether the base stream will be closed when @stream is closed.
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**/
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void
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g_filter_output_stream_set_close_base_stream (GFilterOutputStream *stream,
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gboolean close_base)
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{
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GFilterOutputStreamPrivate *priv;
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g_return_if_fail (G_IS_FILTER_OUTPUT_STREAM (stream));
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close_base = !!close_base;
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priv = g_filter_output_stream_get_instance_private (stream);
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if (priv->close_base != close_base)
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{
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priv->close_base = close_base;
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g_object_notify (G_OBJECT (stream), "close-base-stream");
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}
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}
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static gssize
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g_filter_output_stream_write (GOutputStream *stream,
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const void *buffer,
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gsize count,
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GCancellable *cancellable,
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GError **error)
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{
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GFilterOutputStream *filter_stream;
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gssize nwritten;
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filter_stream = G_FILTER_OUTPUT_STREAM (stream);
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nwritten = g_output_stream_write (filter_stream->base_stream,
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buffer,
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count,
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cancellable,
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error);
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return nwritten;
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}
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static gboolean
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g_filter_output_stream_flush (GOutputStream *stream,
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GCancellable *cancellable,
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GError **error)
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{
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GFilterOutputStream *filter_stream;
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gboolean res;
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filter_stream = G_FILTER_OUTPUT_STREAM (stream);
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res = g_output_stream_flush (filter_stream->base_stream,
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cancellable,
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error);
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return res;
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}
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static gboolean
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g_filter_output_stream_close (GOutputStream *stream,
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GCancellable *cancellable,
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GError **error)
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{
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GFilterOutputStream *filter_stream = G_FILTER_OUTPUT_STREAM (stream);
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GFilterOutputStreamPrivate *priv = g_filter_output_stream_get_instance_private (filter_stream);
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gboolean res = TRUE;
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if (priv->close_base)
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{
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res = g_output_stream_close (filter_stream->base_stream,
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cancellable,
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error);
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}
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return res;
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}
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