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761 lines
25 KiB
C
761 lines
25 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: Christian Kellner <gicmo@gnome.org>
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*/
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#include "config.h"
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#include "gbufferedoutputstream.h"
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#include "goutputstream.h"
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#include "gsimpleasyncresult.h"
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#include "string.h"
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#include "glibintl.h"
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/**
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* SECTION:gbufferedoutputstream
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* @short_description: Buffered Output Stream
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* @include: gio/gio.h
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* @see_also: #GFilterOutputStream, #GOutputStream
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*
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* Buffered output stream implements #GFilterOutputStream and provides
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* for buffered writes.
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*
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* By default, #GBufferedOutputStream's buffer size is set at 4 kilobytes.
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*
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* To create a buffered output stream, use g_buffered_output_stream_new(),
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* or g_buffered_output_stream_new_sized() to specify the buffer's size
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* at construction.
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*
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* To get the size of a buffer within a buffered input stream, use
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* g_buffered_output_stream_get_buffer_size(). To change the size of a
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* buffered output stream's buffer, use
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* g_buffered_output_stream_set_buffer_size(). Note that the buffer's
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* size cannot be reduced below the size of the data within the buffer.
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**/
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#define DEFAULT_BUFFER_SIZE 4096
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struct _GBufferedOutputStreamPrivate {
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guint8 *buffer;
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gsize len;
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goffset pos;
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gboolean auto_grow;
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};
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enum {
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PROP_0,
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PROP_BUFSIZE,
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PROP_AUTO_GROW
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};
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static void g_buffered_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_buffered_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_buffered_output_stream_finalize (GObject *object);
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static gssize g_buffered_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_buffered_output_stream_flush (GOutputStream *stream,
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GCancellable *cancellable,
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GError **error);
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static gboolean g_buffered_output_stream_close (GOutputStream *stream,
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GCancellable *cancellable,
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GError **error);
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static void g_buffered_output_stream_write_async (GOutputStream *stream,
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const void *buffer,
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gsize count,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer data);
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static gssize g_buffered_output_stream_write_finish (GOutputStream *stream,
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GAsyncResult *result,
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GError **error);
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static void g_buffered_output_stream_flush_async (GOutputStream *stream,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer data);
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static gboolean g_buffered_output_stream_flush_finish (GOutputStream *stream,
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GAsyncResult *result,
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GError **error);
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static void g_buffered_output_stream_close_async (GOutputStream *stream,
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int io_priority,
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GCancellable *cancellable,
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GAsyncReadyCallback callback,
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gpointer data);
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static gboolean g_buffered_output_stream_close_finish (GOutputStream *stream,
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GAsyncResult *result,
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GError **error);
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G_DEFINE_TYPE (GBufferedOutputStream,
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g_buffered_output_stream,
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G_TYPE_FILTER_OUTPUT_STREAM)
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static void
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g_buffered_output_stream_class_init (GBufferedOutputStreamClass *klass)
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{
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GObjectClass *object_class;
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GOutputStreamClass *ostream_class;
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g_type_class_add_private (klass, sizeof (GBufferedOutputStreamPrivate));
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object_class = G_OBJECT_CLASS (klass);
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object_class->get_property = g_buffered_output_stream_get_property;
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object_class->set_property = g_buffered_output_stream_set_property;
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object_class->finalize = g_buffered_output_stream_finalize;
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ostream_class = G_OUTPUT_STREAM_CLASS (klass);
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ostream_class->write_fn = g_buffered_output_stream_write;
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ostream_class->flush = g_buffered_output_stream_flush;
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ostream_class->close_fn = g_buffered_output_stream_close;
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ostream_class->write_async = g_buffered_output_stream_write_async;
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ostream_class->write_finish = g_buffered_output_stream_write_finish;
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ostream_class->flush_async = g_buffered_output_stream_flush_async;
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ostream_class->flush_finish = g_buffered_output_stream_flush_finish;
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ostream_class->close_async = g_buffered_output_stream_close_async;
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ostream_class->close_finish = g_buffered_output_stream_close_finish;
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g_object_class_install_property (object_class,
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PROP_BUFSIZE,
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g_param_spec_uint ("buffer-size",
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P_("Buffer Size"),
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P_("The size of the backend buffer"),
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1,
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G_MAXUINT,
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DEFAULT_BUFFER_SIZE,
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G_PARAM_READWRITE|G_PARAM_CONSTRUCT|
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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_AUTO_GROW,
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g_param_spec_boolean ("auto-grow",
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P_("Auto-grow"),
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P_("Whether the buffer should automatically grow"),
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FALSE,
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G_PARAM_READWRITE|
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G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
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}
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/**
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* g_buffered_output_stream_get_buffer_size:
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* @stream: a #GBufferedOutputStream.
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*
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* Gets the size of the buffer in the @stream.
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*
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* Returns: the current size of the buffer.
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**/
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gsize
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g_buffered_output_stream_get_buffer_size (GBufferedOutputStream *stream)
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{
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g_return_val_if_fail (G_IS_BUFFERED_OUTPUT_STREAM (stream), -1);
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return stream->priv->len;
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}
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/**
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* g_buffered_output_stream_set_buffer_size:
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* @stream: a #GBufferedOutputStream.
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* @size: a #gsize.
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*
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* Sets the size of the internal buffer to @size.
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**/
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void
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g_buffered_output_stream_set_buffer_size (GBufferedOutputStream *stream,
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gsize size)
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{
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GBufferedOutputStreamPrivate *priv;
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guint8 *buffer;
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g_return_if_fail (G_IS_BUFFERED_OUTPUT_STREAM (stream));
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priv = stream->priv;
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if (size == priv->len)
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return;
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if (priv->buffer)
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{
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size = MAX (size, priv->pos);
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buffer = g_malloc (size);
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memcpy (buffer, priv->buffer, priv->pos);
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g_free (priv->buffer);
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priv->buffer = buffer;
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priv->len = size;
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/* Keep old pos */
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}
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else
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{
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priv->buffer = g_malloc (size);
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priv->len = size;
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priv->pos = 0;
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}
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g_object_notify (G_OBJECT (stream), "buffer-size");
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}
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/**
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* g_buffered_output_stream_get_auto_grow:
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* @stream: a #GBufferedOutputStream.
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*
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* Checks if the buffer automatically grows as data is added.
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*
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* Returns: %TRUE if the @stream's buffer automatically grows,
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* %FALSE otherwise.
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**/
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gboolean
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g_buffered_output_stream_get_auto_grow (GBufferedOutputStream *stream)
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{
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g_return_val_if_fail (G_IS_BUFFERED_OUTPUT_STREAM (stream), FALSE);
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return stream->priv->auto_grow;
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}
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/**
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* g_buffered_output_stream_set_auto_grow:
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* @stream: a #GBufferedOutputStream.
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* @auto_grow: a #gboolean.
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*
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* Sets whether or not the @stream's buffer should automatically grow.
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* If @auto_grow is true, then each write will just make the buffer
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* larger, and you must manually flush the buffer to actually write out
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* the data to the underlying stream.
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**/
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void
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g_buffered_output_stream_set_auto_grow (GBufferedOutputStream *stream,
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gboolean auto_grow)
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{
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GBufferedOutputStreamPrivate *priv;
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g_return_if_fail (G_IS_BUFFERED_OUTPUT_STREAM (stream));
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priv = stream->priv;
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auto_grow = auto_grow != FALSE;
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if (priv->auto_grow != auto_grow)
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{
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priv->auto_grow = auto_grow;
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g_object_notify (G_OBJECT (stream), "auto-grow");
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}
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}
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static void
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g_buffered_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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GBufferedOutputStream *stream;
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stream = G_BUFFERED_OUTPUT_STREAM (object);
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switch (prop_id)
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{
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case PROP_BUFSIZE:
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g_buffered_output_stream_set_buffer_size (stream, g_value_get_uint (value));
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break;
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case PROP_AUTO_GROW:
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g_buffered_output_stream_set_auto_grow (stream, 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_buffered_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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GBufferedOutputStream *buffered_stream;
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GBufferedOutputStreamPrivate *priv;
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buffered_stream = G_BUFFERED_OUTPUT_STREAM (object);
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priv = buffered_stream->priv;
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switch (prop_id)
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{
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case PROP_BUFSIZE:
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g_value_set_uint (value, priv->len);
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break;
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case PROP_AUTO_GROW:
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g_value_set_boolean (value, priv->auto_grow);
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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_buffered_output_stream_finalize (GObject *object)
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{
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GBufferedOutputStream *stream;
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GBufferedOutputStreamPrivate *priv;
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stream = G_BUFFERED_OUTPUT_STREAM (object);
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priv = stream->priv;
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g_free (priv->buffer);
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G_OBJECT_CLASS (g_buffered_output_stream_parent_class)->finalize (object);
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}
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static void
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g_buffered_output_stream_init (GBufferedOutputStream *stream)
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{
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stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
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G_TYPE_BUFFERED_OUTPUT_STREAM,
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GBufferedOutputStreamPrivate);
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}
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/**
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* g_buffered_output_stream_new:
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* @base_stream: a #GOutputStream.
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*
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* Creates a new buffered output stream for a base stream.
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*
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* Returns: a #GOutputStream for the given @base_stream.
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**/
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GOutputStream *
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g_buffered_output_stream_new (GOutputStream *base_stream)
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{
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GOutputStream *stream;
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g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);
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stream = g_object_new (G_TYPE_BUFFERED_OUTPUT_STREAM,
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"base-stream", base_stream,
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NULL);
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return stream;
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}
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/**
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* g_buffered_output_stream_new_sized:
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* @base_stream: a #GOutputStream.
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* @size: a #gsize.
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*
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* Creates a new buffered output stream with a given buffer size.
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*
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* Returns: a #GOutputStream with an internal buffer set to @size.
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**/
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GOutputStream *
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g_buffered_output_stream_new_sized (GOutputStream *base_stream,
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gsize size)
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{
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GOutputStream *stream;
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g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);
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stream = g_object_new (G_TYPE_BUFFERED_OUTPUT_STREAM,
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"base-stream", base_stream,
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"buffer-size", size,
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NULL);
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return stream;
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}
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static gboolean
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flush_buffer (GBufferedOutputStream *stream,
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GCancellable *cancellable,
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GError **error)
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{
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GBufferedOutputStreamPrivate *priv;
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GOutputStream *base_stream;
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gboolean res;
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gsize bytes_written;
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gsize count;
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priv = stream->priv;
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bytes_written = 0;
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base_stream = G_FILTER_OUTPUT_STREAM (stream)->base_stream;
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g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), FALSE);
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res = g_output_stream_write_all (base_stream,
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priv->buffer,
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priv->pos,
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&bytes_written,
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cancellable,
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error);
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count = priv->pos - bytes_written;
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if (count > 0)
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g_memmove (priv->buffer, priv->buffer + bytes_written, count);
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priv->pos -= bytes_written;
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return res;
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}
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static gssize
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g_buffered_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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GBufferedOutputStream *bstream;
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GBufferedOutputStreamPrivate *priv;
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gboolean res;
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gsize n;
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gsize new_size;
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bstream = G_BUFFERED_OUTPUT_STREAM (stream);
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priv = bstream->priv;
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n = priv->len - priv->pos;
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if (priv->auto_grow && n < count)
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{
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new_size = MAX (priv->len * 2, priv->len + count);
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g_buffered_output_stream_set_buffer_size (bstream, new_size);
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}
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else if (n == 0)
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{
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res = flush_buffer (bstream, cancellable, error);
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if (res == FALSE)
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return -1;
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}
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n = priv->len - priv->pos;
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count = MIN (count, n);
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memcpy (priv->buffer + priv->pos, buffer, count);
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priv->pos += count;
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return count;
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}
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static gboolean
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g_buffered_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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GBufferedOutputStream *bstream;
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GOutputStream *base_stream;
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gboolean res;
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bstream = G_BUFFERED_OUTPUT_STREAM (stream);
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base_stream = G_FILTER_OUTPUT_STREAM (stream)->base_stream;
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res = flush_buffer (bstream, cancellable, error);
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if (res == FALSE)
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return FALSE;
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res = g_output_stream_flush (base_stream, cancellable, error);
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return res;
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}
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static gboolean
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g_buffered_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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GBufferedOutputStream *bstream;
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GOutputStream *base_stream;
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gboolean res;
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bstream = G_BUFFERED_OUTPUT_STREAM (stream);
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base_stream = G_FILTER_OUTPUT_STREAM (bstream)->base_stream;
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res = flush_buffer (bstream, cancellable, error);
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if (g_filter_output_stream_get_close_base_stream (G_FILTER_OUTPUT_STREAM (stream)))
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{
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/* report the first error but still close the stream */
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if (res)
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res = g_output_stream_close (base_stream, cancellable, error);
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else
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g_output_stream_close (base_stream, cancellable, NULL);
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}
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return res;
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}
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/* ************************** */
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/* Async stuff implementation */
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/* ************************** */
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/* TODO: This should be using the base class async ops, not threads */
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typedef struct {
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guint flush_stream : 1;
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guint close_stream : 1;
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} FlushData;
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static void
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free_flush_data (gpointer data)
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{
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g_slice_free (FlushData, data);
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}
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/* This function is used by all three (i.e.
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* _write, _flush, _close) functions since
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* all of them will need to flush the buffer
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* and so closing and writing is just a special
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* case of flushing + some addition stuff */
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static void
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flush_buffer_thread (GSimpleAsyncResult *result,
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GObject *object,
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GCancellable *cancellable)
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{
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GBufferedOutputStream *stream;
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GOutputStream *base_stream;
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FlushData *fdata;
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gboolean res;
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GError *error = NULL;
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stream = G_BUFFERED_OUTPUT_STREAM (object);
|
|
fdata = g_simple_async_result_get_op_res_gpointer (result);
|
|
base_stream = G_FILTER_OUTPUT_STREAM (stream)->base_stream;
|
|
|
|
res = flush_buffer (stream, cancellable, &error);
|
|
|
|
/* if flushing the buffer didn't work don't even bother
|
|
* to flush the stream but just report that error */
|
|
if (res && fdata->flush_stream)
|
|
res = g_output_stream_flush (base_stream, cancellable, &error);
|
|
|
|
if (fdata->close_stream)
|
|
{
|
|
|
|
/* if flushing the buffer or the stream returned
|
|
* an error report that first error but still try
|
|
* close the stream */
|
|
if (g_filter_output_stream_get_close_base_stream (G_FILTER_OUTPUT_STREAM (stream)))
|
|
{
|
|
if (res == FALSE)
|
|
g_output_stream_close (base_stream, cancellable, NULL);
|
|
else
|
|
res = g_output_stream_close (base_stream, cancellable, &error);
|
|
}
|
|
}
|
|
|
|
if (res == FALSE)
|
|
g_simple_async_result_take_error (result, error);
|
|
}
|
|
|
|
typedef struct {
|
|
|
|
FlushData fdata;
|
|
|
|
gsize count;
|
|
const void *buffer;
|
|
|
|
} WriteData;
|
|
|
|
static void
|
|
free_write_data (gpointer data)
|
|
{
|
|
g_slice_free (WriteData, data);
|
|
}
|
|
|
|
static void
|
|
g_buffered_output_stream_write_async (GOutputStream *stream,
|
|
const void *buffer,
|
|
gsize count,
|
|
int io_priority,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer data)
|
|
{
|
|
GBufferedOutputStream *buffered_stream;
|
|
GBufferedOutputStreamPrivate *priv;
|
|
GSimpleAsyncResult *res;
|
|
WriteData *wdata;
|
|
|
|
buffered_stream = G_BUFFERED_OUTPUT_STREAM (stream);
|
|
priv = buffered_stream->priv;
|
|
|
|
wdata = g_slice_new (WriteData);
|
|
wdata->count = count;
|
|
wdata->buffer = buffer;
|
|
|
|
res = g_simple_async_result_new (G_OBJECT (stream),
|
|
callback,
|
|
data,
|
|
g_buffered_output_stream_write_async);
|
|
|
|
g_simple_async_result_set_op_res_gpointer (res, wdata, free_write_data);
|
|
|
|
/* if we have space left directly call the
|
|
* callback (from idle) otherwise schedule a buffer
|
|
* flush in the thread. In both cases the actual
|
|
* copying of the data to the buffer will be done in
|
|
* the write_finish () func since that should
|
|
* be fast enough */
|
|
if (priv->len - priv->pos > 0)
|
|
{
|
|
g_simple_async_result_complete_in_idle (res);
|
|
}
|
|
else
|
|
{
|
|
wdata->fdata.flush_stream = FALSE;
|
|
wdata->fdata.close_stream = FALSE;
|
|
g_simple_async_result_run_in_thread (res,
|
|
flush_buffer_thread,
|
|
io_priority,
|
|
cancellable);
|
|
g_object_unref (res);
|
|
}
|
|
}
|
|
|
|
static gssize
|
|
g_buffered_output_stream_write_finish (GOutputStream *stream,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
GBufferedOutputStreamPrivate *priv;
|
|
GBufferedOutputStream *buffered_stream;
|
|
GSimpleAsyncResult *simple;
|
|
WriteData *wdata;
|
|
gssize count;
|
|
|
|
simple = G_SIMPLE_ASYNC_RESULT (result);
|
|
buffered_stream = G_BUFFERED_OUTPUT_STREAM (stream);
|
|
priv = buffered_stream->priv;
|
|
|
|
g_warn_if_fail (g_simple_async_result_get_source_tag (simple) ==
|
|
g_buffered_output_stream_write_async);
|
|
|
|
wdata = g_simple_async_result_get_op_res_gpointer (simple);
|
|
|
|
/* Now do the real copying of data to the buffer */
|
|
count = priv->len - priv->pos;
|
|
count = MIN (wdata->count, count);
|
|
|
|
memcpy (priv->buffer + priv->pos, wdata->buffer, count);
|
|
|
|
priv->pos += count;
|
|
|
|
return count;
|
|
}
|
|
|
|
static void
|
|
g_buffered_output_stream_flush_async (GOutputStream *stream,
|
|
int io_priority,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer data)
|
|
{
|
|
GSimpleAsyncResult *res;
|
|
FlushData *fdata;
|
|
|
|
fdata = g_slice_new (FlushData);
|
|
fdata->flush_stream = TRUE;
|
|
fdata->close_stream = FALSE;
|
|
|
|
res = g_simple_async_result_new (G_OBJECT (stream),
|
|
callback,
|
|
data,
|
|
g_buffered_output_stream_flush_async);
|
|
|
|
g_simple_async_result_set_op_res_gpointer (res, fdata, free_flush_data);
|
|
|
|
g_simple_async_result_run_in_thread (res,
|
|
flush_buffer_thread,
|
|
io_priority,
|
|
cancellable);
|
|
g_object_unref (res);
|
|
}
|
|
|
|
static gboolean
|
|
g_buffered_output_stream_flush_finish (GOutputStream *stream,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
GSimpleAsyncResult *simple;
|
|
|
|
simple = G_SIMPLE_ASYNC_RESULT (result);
|
|
|
|
g_warn_if_fail (g_simple_async_result_get_source_tag (simple) ==
|
|
g_buffered_output_stream_flush_async);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
g_buffered_output_stream_close_async (GOutputStream *stream,
|
|
int io_priority,
|
|
GCancellable *cancellable,
|
|
GAsyncReadyCallback callback,
|
|
gpointer data)
|
|
{
|
|
GSimpleAsyncResult *res;
|
|
FlushData *fdata;
|
|
|
|
fdata = g_slice_new (FlushData);
|
|
fdata->close_stream = TRUE;
|
|
|
|
res = g_simple_async_result_new (G_OBJECT (stream),
|
|
callback,
|
|
data,
|
|
g_buffered_output_stream_close_async);
|
|
|
|
g_simple_async_result_set_op_res_gpointer (res, fdata, free_flush_data);
|
|
|
|
g_simple_async_result_run_in_thread (res,
|
|
flush_buffer_thread,
|
|
io_priority,
|
|
cancellable);
|
|
g_object_unref (res);
|
|
}
|
|
|
|
static gboolean
|
|
g_buffered_output_stream_close_finish (GOutputStream *stream,
|
|
GAsyncResult *result,
|
|
GError **error)
|
|
{
|
|
GSimpleAsyncResult *simple;
|
|
|
|
simple = G_SIMPLE_ASYNC_RESULT (result);
|
|
|
|
g_warn_if_fail (g_simple_async_result_get_source_tag (simple) ==
|
|
g_buffered_output_stream_close_async);
|
|
|
|
return TRUE;
|
|
}
|