glib/gio/gdataoutputstream.c - nest-cam/4320010/glib - Git at Google

 /* 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, see <http://www.gnu.org/licenses/>.
  *
  * Author: Alexander Larsson <alexl@redhat.com>
  */

 #include "config.h"
 #include <string.h>
 #include "gdataoutputstream.h"
 #include "gseekable.h"
 #include "gioenumtypes.h"
 #include "gioerror.h"
 #include "glibintl.h"


 /**
  * SECTION:gdataoutputstream
  * @short_description: Data Output Stream
  * @include: gio/gio.h
  * @see_also: #GOutputStream
  *
  * Data output stream implements #GOutputStream and includes functions for
  * writing data directly to an output stream.
  *
  **/


 struct _GDataOutputStreamPrivate {
   GDataStreamByteOrder byte_order;
 };

 enum {
   PROP_0,
   PROP_BYTE_ORDER
 };

 static void g_data_output_stream_set_property (GObject      *object,
 					       guint         prop_id,
 					       const GValue *value,
 					       GParamSpec   *pspec);
 static void g_data_output_stream_get_property (GObject      *object,
 					       guint         prop_id,
 					       GValue       *value,
 					       GParamSpec   *pspec);

 static void     g_data_output_stream_seekable_iface_init (GSeekableIface  *iface);
 static goffset  g_data_output_stream_tell                (GSeekable       *seekable);
 static gboolean g_data_output_stream_can_seek            (GSeekable       *seekable);
 static gboolean g_data_output_stream_seek                (GSeekable       *seekable,
 							  goffset          offset,
 							  GSeekType        type,
 							  GCancellable    *cancellable,
 							  GError         **error);
 static gboolean g_data_output_stream_can_truncate        (GSeekable       *seekable);
 static gboolean g_data_output_stream_truncate            (GSeekable       *seekable,
 							  goffset          offset,
 							  GCancellable    *cancellable,
 							  GError         **error);

 G_DEFINE_TYPE_WITH_CODE (GDataOutputStream,
 			 g_data_output_stream,
 			 G_TYPE_FILTER_OUTPUT_STREAM,
                          G_ADD_PRIVATE (GDataOutputStream)
 			 G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
 						g_data_output_stream_seekable_iface_init))


 static void
 g_data_output_stream_class_init (GDataOutputStreamClass *klass)
 {
   GObjectClass *object_class;

   object_class = G_OBJECT_CLASS (klass);
   object_class->get_property = g_data_output_stream_get_property;
   object_class->set_property = g_data_output_stream_set_property;

   /**
    * GDataOutputStream:byte-order:
    *
    * Determines the byte ordering that is used when writing
    * multi-byte entities (such as integers) to the stream.
    */
   g_object_class_install_property (object_class,
                                    PROP_BYTE_ORDER,
                                    g_param_spec_enum ("byte-order",
                                                       P_("Byte order"),
                                                       P_("The byte order"),
                                                       G_TYPE_DATA_STREAM_BYTE_ORDER,
                                                       G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN,
                                                       G_PARAM_READWRITE|G_PARAM_STATIC_NAME|G_PARAM_STATIC_BLURB));

 }

 static void
 g_data_output_stream_set_property (GObject     *object,
 				  guint         prop_id,
 				  const GValue *value,
 				  GParamSpec   *pspec)
 {
   GDataOutputStream *dstream;

   dstream = G_DATA_OUTPUT_STREAM (object);

   switch (prop_id)
     {
     case PROP_BYTE_ORDER:
       g_data_output_stream_set_byte_order (dstream, g_value_get_enum (value));
       break;

     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
     }
 }

 static void
 g_data_output_stream_get_property (GObject    *object,
 				   guint       prop_id,
 				   GValue     *value,
 				   GParamSpec *pspec)
 {
   GDataOutputStreamPrivate *priv;
   GDataOutputStream        *dstream;

   dstream = G_DATA_OUTPUT_STREAM (object);
   priv = dstream->priv;

   switch (prop_id)
     {
     case PROP_BYTE_ORDER:
       g_value_set_enum (value, priv->byte_order);
       break;

     default:
       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
       break;
     }
 }

 static void
 g_data_output_stream_init (GDataOutputStream *stream)
 {
   stream->priv = g_data_output_stream_get_instance_private (stream);
   stream->priv->byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
 }

 static void
 g_data_output_stream_seekable_iface_init (GSeekableIface *iface)
 {
   iface->tell         = g_data_output_stream_tell;
   iface->can_seek     = g_data_output_stream_can_seek;
   iface->seek         = g_data_output_stream_seek;
   iface->can_truncate = g_data_output_stream_can_truncate;
   iface->truncate_fn  = g_data_output_stream_truncate;
 }

 /**
  * g_data_output_stream_new:
  * @base_stream: a #GOutputStream.
  *
  * Creates a new data output stream for @base_stream.
  *
  * Returns: #GDataOutputStream.
  **/
 GDataOutputStream *
 g_data_output_stream_new (GOutputStream *base_stream)
 {
   GDataOutputStream *stream;

   g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);

   stream = g_object_new (G_TYPE_DATA_OUTPUT_STREAM,
                          "base-stream", base_stream,
                          NULL);

   return stream;
 }

 /**
  * g_data_output_stream_set_byte_order:
  * @stream: a #GDataOutputStream.
  * @order: a %GDataStreamByteOrder.
  *
  * Sets the byte order of the data output stream to @order.
  **/
 void
 g_data_output_stream_set_byte_order (GDataOutputStream    *stream,
                                      GDataStreamByteOrder  order)
 {
   GDataOutputStreamPrivate *priv;
   g_return_if_fail (G_IS_DATA_OUTPUT_STREAM (stream));
   priv = stream->priv;
   if (priv->byte_order != order)
     {
       priv->byte_order = order;
       g_object_notify (G_OBJECT (stream), "byte-order");
     }
 }

 /**
  * g_data_output_stream_get_byte_order:
  * @stream: a #GDataOutputStream.
  *
  * Gets the byte order for the stream.
  *
  * Returns: the #GDataStreamByteOrder for the @stream.
  **/
 GDataStreamByteOrder
 g_data_output_stream_get_byte_order (GDataOutputStream *stream)
 {
   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN);

   return stream->priv->byte_order;
 }

 /**
  * g_data_output_stream_put_byte:
  * @stream: a #GDataOutputStream.
  * @data: a #guchar.
  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a byte into the output stream.
  *
  * Returns: %TRUE if @data was successfully added to the @stream.
  **/
 gboolean
 g_data_output_stream_put_byte (GDataOutputStream  *stream,
 			       guchar              data,
 			       GCancellable       *cancellable,
 			       GError            **error)
 {
   gsize bytes_written;

   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 				    &data, 1,
 				    &bytes_written,
 				    cancellable, error);
 }

 /**
  * g_data_output_stream_put_int16:
  * @stream: a #GDataOutputStream.
  * @data: a #gint16.
  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a signed 16-bit integer into the output stream.
  *
  * Returns: %TRUE if @data was successfully added to the @stream.
  **/
 gboolean
 g_data_output_stream_put_int16 (GDataOutputStream  *stream,
 				gint16              data,
 				GCancellable       *cancellable,
 				GError            **error)
 {
   gsize bytes_written;

   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

   switch (stream->priv->byte_order)
     {
     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
       data = GINT16_TO_BE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
       data = GINT16_TO_LE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
     default:
       break;
     }

   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 				    &data, 2,
 				    &bytes_written,
 				    cancellable, error);
 }

 /**
  * g_data_output_stream_put_uint16:
  * @stream: a #GDataOutputStream.
  * @data: a #guint16.
  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts an unsigned 16-bit integer into the output stream.
  *
  * Returns: %TRUE if @data was successfully added to the @stream.
  **/
 gboolean
 g_data_output_stream_put_uint16 (GDataOutputStream  *stream,
 				 guint16             data,
 				 GCancellable       *cancellable,
 				 GError            **error)
 {
   gsize bytes_written;

   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

   switch (stream->priv->byte_order)
     {
     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
       data = GUINT16_TO_BE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
       data = GUINT16_TO_LE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
     default:
       break;
     }

   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 				    &data, 2,
 				    &bytes_written,
 				    cancellable, error);
 }

 /**
  * g_data_output_stream_put_int32:
  * @stream: a #GDataOutputStream.
  * @data: a #gint32.
  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a signed 32-bit integer into the output stream.
  *
  * Returns: %TRUE if @data was successfully added to the @stream.
  **/
 gboolean
 g_data_output_stream_put_int32 (GDataOutputStream  *stream,
 				gint32              data,
 				GCancellable       *cancellable,
 				GError            **error)
 {
   gsize bytes_written;

   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

   switch (stream->priv->byte_order)
     {
     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
       data = GINT32_TO_BE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
       data = GINT32_TO_LE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
     default:
       break;
     }

   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 				    &data, 4,
 				    &bytes_written,
 				    cancellable, error);
 }

 /**
  * g_data_output_stream_put_uint32:
  * @stream: a #GDataOutputStream.
  * @data: a #guint32.
  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts an unsigned 32-bit integer into the stream.
  *
  * Returns: %TRUE if @data was successfully added to the @stream.
  **/
 gboolean
 g_data_output_stream_put_uint32 (GDataOutputStream  *stream,
 				 guint32             data,
 				 GCancellable       *cancellable,
 				 GError            **error)
 {
   gsize bytes_written;

   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

   switch (stream->priv->byte_order)
     {
     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
       data = GUINT32_TO_BE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
       data = GUINT32_TO_LE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
     default:
       break;
     }

   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 				    &data, 4,
 				    &bytes_written,
 				    cancellable, error);
 }

 /**
  * g_data_output_stream_put_int64:
  * @stream: a #GDataOutputStream.
  * @data: a #gint64.
  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a signed 64-bit integer into the stream.
  *
  * Returns: %TRUE if @data was successfully added to the @stream.
  **/
 gboolean
 g_data_output_stream_put_int64 (GDataOutputStream  *stream,
 				gint64              data,
 				GCancellable       *cancellable,
 				GError            **error)
 {
   gsize bytes_written;

   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

   switch (stream->priv->byte_order)
     {
     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
       data = GINT64_TO_BE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
       data = GINT64_TO_LE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
     default:
       break;
     }

   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 				    &data, 8,
 				    &bytes_written,
 				    cancellable, error);
 }

 /**
  * g_data_output_stream_put_uint64:
  * @stream: a #GDataOutputStream.
  * @data: a #guint64.
  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts an unsigned 64-bit integer into the stream.
  *
  * Returns: %TRUE if @data was successfully added to the @stream.
  **/
 gboolean
 g_data_output_stream_put_uint64 (GDataOutputStream  *stream,
 				 guint64             data,
 				 GCancellable       *cancellable,
 				 GError            **error)
 {
   gsize bytes_written;

   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

   switch (stream->priv->byte_order)
     {
     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
       data = GUINT64_TO_BE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
       data = GUINT64_TO_LE (data);
       break;
     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
     default:
       break;
     }

   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 				    &data, 8,
 				    &bytes_written,
 				    cancellable, error);
 }

 /**
  * g_data_output_stream_put_string:
  * @stream: a #GDataOutputStream.
  * @str: a string.
  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
  * @error: a #GError, %NULL to ignore.
  *
  * Puts a string into the output stream.
  *
  * Returns: %TRUE if @string was successfully added to the @stream.
  **/
 gboolean
 g_data_output_stream_put_string (GDataOutputStream  *stream,
 				 const char         *str,
 				 GCancellable       *cancellable,
 				 GError            **error)
 {
   gsize bytes_written;

   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
   g_return_val_if_fail (str != NULL, FALSE);

   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 				    str, strlen (str),
 				    &bytes_written,
 				    cancellable, error);
 }

 static goffset
 g_data_output_stream_tell (GSeekable *seekable)
 {
   GOutputStream *base_stream;
   GSeekable *base_stream_seekable;

   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
   if (!G_IS_SEEKABLE (base_stream))
     return 0;
   base_stream_seekable = G_SEEKABLE (base_stream);
   return g_seekable_tell (base_stream_seekable);
 }

 static gboolean
 g_data_output_stream_can_seek (GSeekable *seekable)
 {
   GOutputStream *base_stream;

   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
   return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream));
 }

 static gboolean
 g_data_output_stream_seek (GSeekable     *seekable,
 			   goffset        offset,
 			   GSeekType      type,
 			   GCancellable  *cancellable,
 			   GError       **error)
 {
   GOutputStream *base_stream;
   GSeekable *base_stream_seekable;

   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
   if (!G_IS_SEEKABLE (base_stream))
     {
       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                            _("Seek not supported on base stream"));
       return FALSE;
     }

   base_stream_seekable = G_SEEKABLE (base_stream);
   return g_seekable_seek (base_stream_seekable, offset, type, cancellable, error);
 }

 static gboolean
 g_data_output_stream_can_truncate (GSeekable *seekable)
 {
   GOutputStream *base_stream;

   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
   return G_IS_SEEKABLE (base_stream) && g_seekable_can_truncate (G_SEEKABLE (base_stream));
 }

 static gboolean
 g_data_output_stream_truncate (GSeekable     *seekable,
 				   goffset        offset,
 				   GCancellable  *cancellable,
 				   GError       **error)
 {
   GOutputStream *base_stream;
   GSeekable *base_stream_seekable;

   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
   if (!G_IS_SEEKABLE (base_stream))
     {
       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
                            _("Truncate not supported on base stream"));
       return FALSE;
     }

   base_stream_seekable = G_SEEKABLE (base_stream);
   return g_seekable_truncate (base_stream_seekable, offset, cancellable, error);
 }
	/* 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, see <http://www.gnu.org/licenses/>.
	*
	* Author: Alexander Larsson <alexl@redhat.com>
	*/

	#include "config.h"
	#include <string.h>
	#include "gdataoutputstream.h"
	#include "gseekable.h"
	#include "gioenumtypes.h"
	#include "gioerror.h"
	#include "glibintl.h"


	/**
	* SECTION:gdataoutputstream
	* @short_description: Data Output Stream
	* @include: gio/gio.h
	* @see_also: #GOutputStream
	*
	* Data output stream implements #GOutputStream and includes functions for
	* writing data directly to an output stream.
	*
	**/



	struct _GDataOutputStreamPrivate {
	GDataStreamByteOrder byte_order;
	};

	enum {
	PROP_0,
	PROP_BYTE_ORDER
	};

	static void g_data_output_stream_set_property (GObject *object,
	guint prop_id,
	const GValue *value,
	GParamSpec *pspec);
	static void g_data_output_stream_get_property (GObject *object,
	guint prop_id,
	GValue *value,
	GParamSpec *pspec);

	static void g_data_output_stream_seekable_iface_init (GSeekableIface *iface);
	static goffset g_data_output_stream_tell (GSeekable *seekable);
	static gboolean g_data_output_stream_can_seek (GSeekable *seekable);
	static gboolean g_data_output_stream_seek (GSeekable *seekable,
	goffset offset,
	GSeekType type,
	GCancellable *cancellable,
	GError **error);
	static gboolean g_data_output_stream_can_truncate (GSeekable *seekable);
	static gboolean g_data_output_stream_truncate (GSeekable *seekable,
	goffset offset,
	GCancellable *cancellable,
	GError **error);

	G_DEFINE_TYPE_WITH_CODE (GDataOutputStream,
	g_data_output_stream,
	G_TYPE_FILTER_OUTPUT_STREAM,
	G_ADD_PRIVATE (GDataOutputStream)
	G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
	g_data_output_stream_seekable_iface_init))


	static void
	g_data_output_stream_class_init (GDataOutputStreamClass *klass)
	{
	GObjectClass *object_class;

	object_class = G_OBJECT_CLASS (klass);
	object_class->get_property = g_data_output_stream_get_property;
	object_class->set_property = g_data_output_stream_set_property;

	/**
	* GDataOutputStream:byte-order:
	*
	* Determines the byte ordering that is used when writing
	* multi-byte entities (such as integers) to the stream.
	*/
	g_object_class_install_property (object_class,
	PROP_BYTE_ORDER,
	g_param_spec_enum ("byte-order",
	P_("Byte order"),
	P_("The byte order"),
	G_TYPE_DATA_STREAM_BYTE_ORDER,
	G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN,
	G_PARAM_READWRITE\|G_PARAM_STATIC_NAME\|G_PARAM_STATIC_BLURB));

	}

	static void
	g_data_output_stream_set_property (GObject *object,
	guint prop_id,
	const GValue *value,
	GParamSpec *pspec)
	{
	GDataOutputStream *dstream;

	dstream = G_DATA_OUTPUT_STREAM (object);

	switch (prop_id)
	{
	case PROP_BYTE_ORDER:
	g_data_output_stream_set_byte_order (dstream, g_value_get_enum (value));
	break;

	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	g_data_output_stream_get_property (GObject *object,
	guint prop_id,
	GValue *value,
	GParamSpec *pspec)
	{
	GDataOutputStreamPrivate *priv;
	GDataOutputStream *dstream;

	dstream = G_DATA_OUTPUT_STREAM (object);
	priv = dstream->priv;

	switch (prop_id)
	{
	case PROP_BYTE_ORDER:
	g_value_set_enum (value, priv->byte_order);
	break;

	default:
	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
	break;
	}
	}

	static void
	g_data_output_stream_init (GDataOutputStream *stream)
	{
	stream->priv = g_data_output_stream_get_instance_private (stream);
	stream->priv->byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
	}

	static void
	g_data_output_stream_seekable_iface_init (GSeekableIface *iface)
	{
	iface->tell = g_data_output_stream_tell;
	iface->can_seek = g_data_output_stream_can_seek;
	iface->seek = g_data_output_stream_seek;
	iface->can_truncate = g_data_output_stream_can_truncate;
	iface->truncate_fn = g_data_output_stream_truncate;
	}

	/**
	* g_data_output_stream_new:
	* @base_stream: a #GOutputStream.
	*
	* Creates a new data output stream for @base_stream.
	*
	* Returns: #GDataOutputStream.
	**/
	GDataOutputStream *
	g_data_output_stream_new (GOutputStream *base_stream)
	{
	GDataOutputStream *stream;

	g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);

	stream = g_object_new (G_TYPE_DATA_OUTPUT_STREAM,
	"base-stream", base_stream,
	NULL);

	return stream;
	}

	/**
	* g_data_output_stream_set_byte_order:
	* @stream: a #GDataOutputStream.
	* @order: a %GDataStreamByteOrder.
	*
	* Sets the byte order of the data output stream to @order.
	**/
	void
	g_data_output_stream_set_byte_order (GDataOutputStream *stream,
	GDataStreamByteOrder order)
	{
	GDataOutputStreamPrivate *priv;
	g_return_if_fail (G_IS_DATA_OUTPUT_STREAM (stream));
	priv = stream->priv;
	if (priv->byte_order != order)
	{
	priv->byte_order = order;
	g_object_notify (G_OBJECT (stream), "byte-order");
	}
	}

	/**
	* g_data_output_stream_get_byte_order:
	* @stream: a #GDataOutputStream.
	*
	* Gets the byte order for the stream.
	*
	* Returns: the #GDataStreamByteOrder for the @stream.
	**/
	GDataStreamByteOrder
	g_data_output_stream_get_byte_order (GDataOutputStream *stream)
	{
	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN);

	return stream->priv->byte_order;
	}

	/**
	* g_data_output_stream_put_byte:
	* @stream: a #GDataOutputStream.
	* @data: a #guchar.
	* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
	* @error: a #GError, %NULL to ignore.
	*
	* Puts a byte into the output stream.
	*
	* Returns: %TRUE if @data was successfully added to the @stream.
	**/
	gboolean
	g_data_output_stream_put_byte (GDataOutputStream *stream,
	guchar data,
	GCancellable *cancellable,
	GError **error)
	{
	gsize bytes_written;

	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

	return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
	&data, 1,
	&bytes_written,
	cancellable, error);
	}

	/**
	* g_data_output_stream_put_int16:
	* @stream: a #GDataOutputStream.
	* @data: a #gint16.
	* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
	* @error: a #GError, %NULL to ignore.
	*
	* Puts a signed 16-bit integer into the output stream.
	*
	* Returns: %TRUE if @data was successfully added to the @stream.
	**/
	gboolean
	g_data_output_stream_put_int16 (GDataOutputStream *stream,
	gint16 data,
	GCancellable *cancellable,
	GError **error)
	{
	gsize bytes_written;

	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

	switch (stream->priv->byte_order)
	{
	case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
	data = GINT16_TO_BE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
	data = GINT16_TO_LE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
	default:
	break;
	}

	return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
	&data, 2,
	&bytes_written,
	cancellable, error);
	}

	/**
	* g_data_output_stream_put_uint16:
	* @stream: a #GDataOutputStream.
	* @data: a #guint16.
	* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
	* @error: a #GError, %NULL to ignore.
	*
	* Puts an unsigned 16-bit integer into the output stream.
	*
	* Returns: %TRUE if @data was successfully added to the @stream.
	**/
	gboolean
	g_data_output_stream_put_uint16 (GDataOutputStream *stream,
	guint16 data,
	GCancellable *cancellable,
	GError **error)
	{
	gsize bytes_written;

	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

	switch (stream->priv->byte_order)
	{
	case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
	data = GUINT16_TO_BE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
	data = GUINT16_TO_LE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
	default:
	break;
	}

	return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
	&data, 2,
	&bytes_written,
	cancellable, error);
	}

	/**
	* g_data_output_stream_put_int32:
	* @stream: a #GDataOutputStream.
	* @data: a #gint32.
	* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
	* @error: a #GError, %NULL to ignore.
	*
	* Puts a signed 32-bit integer into the output stream.
	*
	* Returns: %TRUE if @data was successfully added to the @stream.
	**/
	gboolean
	g_data_output_stream_put_int32 (GDataOutputStream *stream,
	gint32 data,
	GCancellable *cancellable,
	GError **error)
	{
	gsize bytes_written;

	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

	switch (stream->priv->byte_order)
	{
	case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
	data = GINT32_TO_BE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
	data = GINT32_TO_LE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
	default:
	break;
	}

	return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
	&data, 4,
	&bytes_written,
	cancellable, error);
	}

	/**
	* g_data_output_stream_put_uint32:
	* @stream: a #GDataOutputStream.
	* @data: a #guint32.
	* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
	* @error: a #GError, %NULL to ignore.
	*
	* Puts an unsigned 32-bit integer into the stream.
	*
	* Returns: %TRUE if @data was successfully added to the @stream.
	**/
	gboolean
	g_data_output_stream_put_uint32 (GDataOutputStream *stream,
	guint32 data,
	GCancellable *cancellable,
	GError **error)
	{
	gsize bytes_written;

	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

	switch (stream->priv->byte_order)
	{
	case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
	data = GUINT32_TO_BE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
	data = GUINT32_TO_LE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
	default:
	break;
	}

	return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
	&data, 4,
	&bytes_written,
	cancellable, error);
	}

	/**
	* g_data_output_stream_put_int64:
	* @stream: a #GDataOutputStream.
	* @data: a #gint64.
	* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
	* @error: a #GError, %NULL to ignore.
	*
	* Puts a signed 64-bit integer into the stream.
	*
	* Returns: %TRUE if @data was successfully added to the @stream.
	**/
	gboolean
	g_data_output_stream_put_int64 (GDataOutputStream *stream,
	gint64 data,
	GCancellable *cancellable,
	GError **error)
	{
	gsize bytes_written;

	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

	switch (stream->priv->byte_order)
	{
	case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
	data = GINT64_TO_BE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
	data = GINT64_TO_LE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
	default:
	break;
	}

	return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
	&data, 8,
	&bytes_written,
	cancellable, error);
	}

	/**
	* g_data_output_stream_put_uint64:
	* @stream: a #GDataOutputStream.
	* @data: a #guint64.
	* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
	* @error: a #GError, %NULL to ignore.
	*
	* Puts an unsigned 64-bit integer into the stream.
	*
	* Returns: %TRUE if @data was successfully added to the @stream.
	**/
	gboolean
	g_data_output_stream_put_uint64 (GDataOutputStream *stream,
	guint64 data,
	GCancellable *cancellable,
	GError **error)
	{
	gsize bytes_written;

	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);

	switch (stream->priv->byte_order)
	{
	case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
	data = GUINT64_TO_BE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
	data = GUINT64_TO_LE (data);
	break;
	case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
	default:
	break;
	}

	return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
	&data, 8,
	&bytes_written,
	cancellable, error);
	}

	/**
	* g_data_output_stream_put_string:
	* @stream: a #GDataOutputStream.
	* @str: a string.
	* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
	* @error: a #GError, %NULL to ignore.
	*
	* Puts a string into the output stream.
	*
	* Returns: %TRUE if @string was successfully added to the @stream.
	**/
	gboolean
	g_data_output_stream_put_string (GDataOutputStream *stream,
	const char *str,
	GCancellable *cancellable,
	GError **error)
	{
	gsize bytes_written;

	g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
	g_return_val_if_fail (str != NULL, FALSE);

	return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
	str, strlen (str),
	&bytes_written,
	cancellable, error);
	}

	static goffset
	g_data_output_stream_tell (GSeekable *seekable)
	{
	GOutputStream *base_stream;
	GSeekable *base_stream_seekable;

	base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
	if (!G_IS_SEEKABLE (base_stream))
	return 0;
	base_stream_seekable = G_SEEKABLE (base_stream);
	return g_seekable_tell (base_stream_seekable);
	}

	static gboolean
	g_data_output_stream_can_seek (GSeekable *seekable)
	{
	GOutputStream *base_stream;

	base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
	return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream));
	}

	static gboolean
	g_data_output_stream_seek (GSeekable *seekable,
	goffset offset,
	GSeekType type,
	GCancellable *cancellable,
	GError **error)
	{
	GOutputStream *base_stream;
	GSeekable *base_stream_seekable;

	base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
	if (!G_IS_SEEKABLE (base_stream))
	{
	g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
	_("Seek not supported on base stream"));
	return FALSE;
	}

	base_stream_seekable = G_SEEKABLE (base_stream);
	return g_seekable_seek (base_stream_seekable, offset, type, cancellable, error);
	}

	static gboolean
	g_data_output_stream_can_truncate (GSeekable *seekable)
	{
	GOutputStream *base_stream;

	base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
	return G_IS_SEEKABLE (base_stream) && g_seekable_can_truncate (G_SEEKABLE (base_stream));
	}

	static gboolean
	g_data_output_stream_truncate (GSeekable *seekable,
	goffset offset,
	GCancellable *cancellable,
	GError **error)
	{
	GOutputStream *base_stream;
	GSeekable *base_stream_seekable;

	base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
	if (!G_IS_SEEKABLE (base_stream))
	{
	g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
	_("Truncate not supported on base stream"));
	return FALSE;
	}

	base_stream_seekable = G_SEEKABLE (base_stream);
	return g_seekable_truncate (base_stream_seekable, offset, cancellable, error);
	}