gio/gbufferedoutputstream.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Christian Kellner <gicmo@gnome.org>
  21  */
  22
  23 #include "config.h"
  24 #include "gbufferedoutputstream.h"
  25 #include "goutputstream.h"
  26 #include "gseekable.h"
  27 #include "gtask.h"
  28 #include "string.h"
  29 #include "gioerror.h"
  30 #include "glibintl.h"
  31
  32 /**
  33  * SECTION:gbufferedoutputstream
  34  * @short_description: Buffered Output Stream
  35  * @include: gio/gio.h
  36  * @see_also: #GFilterOutputStream, #GOutputStream
  37  *
  38  * Buffered output stream implements #GFilterOutputStream and provides
  39  * for buffered writes.
  40  *
  41  * By default, #GBufferedOutputStream's buffer size is set at 4 kilobytes.
  42  *
  43  * To create a buffered output stream, use g_buffered_output_stream_new(),
  44  * or g_buffered_output_stream_new_sized() to specify the buffer's size
  45  * at construction.
  46  *
  47  * To get the size of a buffer within a buffered input stream, use
  48  * g_buffered_output_stream_get_buffer_size(). To change the size of a
  49  * buffered output stream's buffer, use
  50  * g_buffered_output_stream_set_buffer_size(). Note that the buffer's
  51  * size cannot be reduced below the size of the data within the buffer.
  52  **/
  53
  54 #define DEFAULT_BUFFER_SIZE 4096
  55
  56 struct _GBufferedOutputStreamPrivate {
  57   guint8 *buffer;
  58   gsize   len;
  59   goffset pos;
  60   gboolean auto_grow;
  61 };
  62
  63 enum {
  64   PROP_0,
  65   PROP_BUFSIZE,
  66   PROP_AUTO_GROW
  67 };
  68
  69 static void     g_buffered_output_stream_set_property (GObject      *object,
  70                                                        guint         prop_id,
  71                                                        const GValue *value,
  72                                                        GParamSpec   *pspec);
  73
  74 static void     g_buffered_output_stream_get_property (GObject    *object,
  75                                                        guint       prop_id,
  76                                                        GValue     *value,
  77                                                        GParamSpec *pspec);
  78 static void     g_buffered_output_stream_finalize     (GObject *object);
  79
  80
  81 static gssize   g_buffered_output_stream_write        (GOutputStream *stream,
  82                                                        const void    *buffer,
  83                                                        gsize          count,
  84                                                        GCancellable  *cancellable,
  85                                                        GError       **error);
  86 static gboolean g_buffered_output_stream_flush        (GOutputStream    *stream,
  87                                                        GCancellable  *cancellable,
  88                                                        GError          **error);
  89 static gboolean g_buffered_output_stream_close        (GOutputStream  *stream,
  90                                                        GCancellable   *cancellable,
  91                                                        GError        **error);
  92
  93 static void     g_buffered_output_stream_flush_async  (GOutputStream        *stream,
  94                                                        int                   io_priority,
  95                                                        GCancellable         *cancellable,
  96                                                        GAsyncReadyCallback   callback,
  97                                                        gpointer              data);
  98 static gboolean g_buffered_output_stream_flush_finish (GOutputStream        *stream,
  99                                                        GAsyncResult         *result,
 100                                                        GError              **error);
 101 static void     g_buffered_output_stream_close_async  (GOutputStream        *stream,
 102                                                        int                   io_priority,
 103                                                        GCancellable         *cancellable,
 104                                                        GAsyncReadyCallback   callback,
 105                                                        gpointer              data);
 106 static gboolean g_buffered_output_stream_close_finish (GOutputStream        *stream,
 107                                                        GAsyncResult         *result,
 108                                                        GError              **error);
 109
 110 static void     g_buffered_output_stream_seekable_iface_init (GSeekableIface  *iface);
 111 static goffset  g_buffered_output_stream_tell                (GSeekable       *seekable);
 112 static gboolean g_buffered_output_stream_can_seek            (GSeekable       *seekable);
 113 static gboolean g_buffered_output_stream_seek                (GSeekable       *seekable,
 114                                                               goffset          offset,
 115                                                               GSeekType        type,
 116                                                               GCancellable    *cancellable,
 117                                                               GError         **error);
 118 static gboolean g_buffered_output_stream_can_truncate        (GSeekable       *seekable);
 119 static gboolean g_buffered_output_stream_truncate            (GSeekable       *seekable,
 120                                                               goffset          offset,
 121                                                               GCancellable    *cancellable,
 122                                                               GError         **error);
 123
 124 G_DEFINE_TYPE_WITH_CODE (GBufferedOutputStream,
 125                          g_buffered_output_stream,
 126                          G_TYPE_FILTER_OUTPUT_STREAM,
 127                          G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
 128                                                 g_buffered_output_stream_seekable_iface_init))
 129
 130
 131 static void
 132 g_buffered_output_stream_class_init (GBufferedOutputStreamClass *klass)
 133 {
 134   GObjectClass *object_class;
 135   GOutputStreamClass *ostream_class;
 136
 137   g_type_class_add_private (klass, sizeof (GBufferedOutputStreamPrivate));
 138
 139   object_class = G_OBJECT_CLASS (klass);
 140   object_class->get_property = g_buffered_output_stream_get_property;
 141   object_class->set_property = g_buffered_output_stream_set_property;
 142   object_class->finalize     = g_buffered_output_stream_finalize;
 143
 144   ostream_class = G_OUTPUT_STREAM_CLASS (klass);
 145   ostream_class->write_fn = g_buffered_output_stream_write;
 146   ostream_class->flush = g_buffered_output_stream_flush;
 147   ostream_class->close_fn = g_buffered_output_stream_close;
 148   ostream_class->flush_async  = g_buffered_output_stream_flush_async;
 149   ostream_class->flush_finish = g_buffered_output_stream_flush_finish;
 150   ostream_class->close_async  = g_buffered_output_stream_close_async;
 151   ostream_class->close_finish = g_buffered_output_stream_close_finish;
 152
 153   g_object_class_install_property (object_class,
 154                                    PROP_BUFSIZE,
 155                                    g_param_spec_uint ("buffer-size",
 156                                                       P_("Buffer Size"),
 157                                                       P_("The size of the backend buffer"),
 158                                                       1,
 159                                                       G_MAXUINT,
 160                                                       DEFAULT_BUFFER_SIZE,
 161                                                       G_PARAM_READWRITE|G_PARAM_CONSTRUCT|
 162                                                       G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 163
 164   g_object_class_install_property (object_class,
 165                                    PROP_AUTO_GROW,
 166                                    g_param_spec_boolean ("auto-grow",
 167                                                          P_("Auto-grow"),
 168                                                          P_("Whether the buffer should automatically grow"),
 169                                                          FALSE,
 170                                                          G_PARAM_READWRITE|
 171                                                          G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
 172
 173 }
 174
 175 /**
 176  * g_buffered_output_stream_get_buffer_size:
 177  * @stream: a #GBufferedOutputStream.
 178  *
 179  * Gets the size of the buffer in the @stream.
 180  *
 181  * Returns: the current size of the buffer.
 182  **/
 183 gsize
 184 g_buffered_output_stream_get_buffer_size (GBufferedOutputStream *stream)
 185 {
 186   g_return_val_if_fail (G_IS_BUFFERED_OUTPUT_STREAM (stream), -1);
 187
 188   return stream->priv->len;
 189 }
 190
 191 /**
 192  * g_buffered_output_stream_set_buffer_size:
 193  * @stream: a #GBufferedOutputStream.
 194  * @size: a #gsize.
 195  *
 196  * Sets the size of the internal buffer to @size.
 197  **/
 198 void
 199 g_buffered_output_stream_set_buffer_size (GBufferedOutputStream *stream,
 200                                           gsize                  size)
 201 {
 202   GBufferedOutputStreamPrivate *priv;
 203   guint8 *buffer;
 204
 205   g_return_if_fail (G_IS_BUFFERED_OUTPUT_STREAM (stream));
 206
 207   priv = stream->priv;
 208
 209   if (size == priv->len)
 210     return;
 211
 212   if (priv->buffer)
 213     {
 214       size = MAX (size, priv->pos);
 215
 216       buffer = g_malloc (size);
 217       memcpy (buffer, priv->buffer, priv->pos);
 218       g_free (priv->buffer);
 219       priv->buffer = buffer;
 220       priv->len = size;
 221       /* Keep old pos */
 222     }
 223   else
 224     {
 225       priv->buffer = g_malloc (size);
 226       priv->len = size;
 227       priv->pos = 0;
 228     }
 229
 230   g_object_notify (G_OBJECT (stream), "buffer-size");
 231 }
 232
 233 /**
 234  * g_buffered_output_stream_get_auto_grow:
 235  * @stream: a #GBufferedOutputStream.
 236  *
 237  * Checks if the buffer automatically grows as data is added.
 238  *
 239  * Returns: %TRUE if the @stream's buffer automatically grows,
 240  * %FALSE otherwise.
 241  **/
 242 gboolean
 243 g_buffered_output_stream_get_auto_grow (GBufferedOutputStream *stream)
 244 {
 245   g_return_val_if_fail (G_IS_BUFFERED_OUTPUT_STREAM (stream), FALSE);
 246
 247   return stream->priv->auto_grow;
 248 }
 249
 250 /**
 251  * g_buffered_output_stream_set_auto_grow:
 252  * @stream: a #GBufferedOutputStream.
 253  * @auto_grow: a #gboolean.
 254  *
 255  * Sets whether or not the @stream's buffer should automatically grow.
 256  * If @auto_grow is true, then each write will just make the buffer
 257  * larger, and you must manually flush the buffer to actually write out
 258  * the data to the underlying stream.
 259  **/
 260 void
 261 g_buffered_output_stream_set_auto_grow (GBufferedOutputStream *stream,
 262                                         gboolean               auto_grow)
 263 {
 264   GBufferedOutputStreamPrivate *priv;
 265   g_return_if_fail (G_IS_BUFFERED_OUTPUT_STREAM (stream));
 266   priv = stream->priv;
 267   auto_grow = auto_grow != FALSE;
 268   if (priv->auto_grow != auto_grow)
 269     {
 270       priv->auto_grow = auto_grow;
 271       g_object_notify (G_OBJECT (stream), "auto-grow");
 272     }
 273 }
 274
 275 static void
 276 g_buffered_output_stream_set_property (GObject      *object,
 277                                        guint         prop_id,
 278                                        const GValue *value,
 279                                        GParamSpec   *pspec)
 280 {
 281   GBufferedOutputStream *stream;
 282
 283   stream = G_BUFFERED_OUTPUT_STREAM (object);
 284
 285   switch (prop_id)
 286     {
 287     case PROP_BUFSIZE:
 288       g_buffered_output_stream_set_buffer_size (stream, g_value_get_uint (value));
 289       break;
 290
 291     case PROP_AUTO_GROW:
 292       g_buffered_output_stream_set_auto_grow (stream, g_value_get_boolean (value));
 293       break;
 294
 295     default:
 296       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 297       break;
 298     }
 299
 300 }
 301
 302 static void
 303 g_buffered_output_stream_get_property (GObject    *object,
 304                                        guint       prop_id,
 305                                        GValue     *value,
 306                                        GParamSpec *pspec)
 307 {
 308   GBufferedOutputStream *buffered_stream;
 309   GBufferedOutputStreamPrivate *priv;
 310
 311   buffered_stream = G_BUFFERED_OUTPUT_STREAM (object);
 312   priv = buffered_stream->priv;
 313
 314   switch (prop_id)
 315     {
 316     case PROP_BUFSIZE:
 317       g_value_set_uint (value, priv->len);
 318       break;
 319
 320     case PROP_AUTO_GROW:
 321       g_value_set_boolean (value, priv->auto_grow);
 322       break;
 323
 324     default:
 325       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 326       break;
 327     }
 328
 329 }
 330
 331 static void
 332 g_buffered_output_stream_finalize (GObject *object)
 333 {
 334   GBufferedOutputStream *stream;
 335   GBufferedOutputStreamPrivate *priv;
 336
 337   stream = G_BUFFERED_OUTPUT_STREAM (object);
 338   priv = stream->priv;
 339
 340   g_free (priv->buffer);
 341
 342   G_OBJECT_CLASS (g_buffered_output_stream_parent_class)->finalize (object);
 343 }
 344
 345 static void
 346 g_buffered_output_stream_init (GBufferedOutputStream *stream)
 347 {
 348   stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
 349                                               G_TYPE_BUFFERED_OUTPUT_STREAM,
 350                                               GBufferedOutputStreamPrivate);
 351
 352 }
 353
 354 static void
 355 g_buffered_output_stream_seekable_iface_init (GSeekableIface *iface)
 356 {
 357   iface->tell         = g_buffered_output_stream_tell;
 358   iface->can_seek     = g_buffered_output_stream_can_seek;
 359   iface->seek         = g_buffered_output_stream_seek;
 360   iface->can_truncate = g_buffered_output_stream_can_truncate;
 361   iface->truncate_fn  = g_buffered_output_stream_truncate;
 362 }
 363
 364 /**
 365  * g_buffered_output_stream_new:
 366  * @base_stream: a #GOutputStream.
 367  *
 368  * Creates a new buffered output stream for a base stream.
 369  *
 370  * Returns: a #GOutputStream for the given @base_stream.
 371  **/
 372 GOutputStream *
 373 g_buffered_output_stream_new (GOutputStream *base_stream)
 374 {
 375   GOutputStream *stream;
 376
 377   g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);
 378
 379   stream = g_object_new (G_TYPE_BUFFERED_OUTPUT_STREAM,
 380                          "base-stream", base_stream,
 381                          NULL);
 382
 383   return stream;
 384 }
 385
 386 /**
 387  * g_buffered_output_stream_new_sized:
 388  * @base_stream: a #GOutputStream.
 389  * @size: a #gsize.
 390  *
 391  * Creates a new buffered output stream with a given buffer size.
 392  *
 393  * Returns: a #GOutputStream with an internal buffer set to @size.
 394  **/
 395 GOutputStream *
 396 g_buffered_output_stream_new_sized (GOutputStream *base_stream,
 397                                     gsize          size)
 398 {
 399   GOutputStream *stream;
 400
 401   g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);
 402
 403   stream = g_object_new (G_TYPE_BUFFERED_OUTPUT_STREAM,
 404                          "base-stream", base_stream,
 405                          "buffer-size", size,
 406                          NULL);
 407
 408   return stream;
 409 }
 410
 411 static gboolean
 412 flush_buffer (GBufferedOutputStream  *stream,
 413               GCancellable           *cancellable,
 414               GError                 **error)
 415 {
 416   GBufferedOutputStreamPrivate *priv;
 417   GOutputStream                *base_stream;
 418   gboolean                      res;
 419   gsize                         bytes_written;
 420   gsize                         count;
 421
 422   priv = stream->priv;
 423   bytes_written = 0;
 424   base_stream = G_FILTER_OUTPUT_STREAM (stream)->base_stream;
 425
 426   g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), FALSE);
 427
 428   res = g_output_stream_write_all (base_stream,
 429                                    priv->buffer,
 430                                    priv->pos,
 431                                    &bytes_written,
 432                                    cancellable,
 433                                    error);
 434
 435   count = priv->pos - bytes_written;
 436
 437   if (count > 0)
 438     g_memmove (priv->buffer, priv->buffer + bytes_written, count);
 439
 440   priv->pos -= bytes_written;
 441
 442   return res;
 443 }
 444
 445 static gssize
 446 g_buffered_output_stream_write  (GOutputStream *stream,
 447                                  const void    *buffer,
 448                                  gsize          count,
 449                                  GCancellable  *cancellable,
 450                                  GError       **error)
 451 {
 452   GBufferedOutputStream        *bstream;
 453   GBufferedOutputStreamPrivate *priv;
 454   gboolean res;
 455   gsize    n;
 456   gsize new_size;
 457
 458   bstream = G_BUFFERED_OUTPUT_STREAM (stream);
 459   priv = bstream->priv;
 460
 461   n = priv->len - priv->pos;
 462
 463   if (priv->auto_grow && n < count)
 464     {
 465       new_size = MAX (priv->len * 2, priv->len + count);
 466       g_buffered_output_stream_set_buffer_size (bstream, new_size);
 467     }
 468   else if (n == 0)
 469     {
 470       res = flush_buffer (bstream, cancellable, error);
 471
 472       if (res == FALSE)
 473         return -1;
 474     }
 475
 476   n = priv->len - priv->pos;
 477
 478   count = MIN (count, n);
 479   memcpy (priv->buffer + priv->pos, buffer, count);
 480   priv->pos += count;
 481
 482   return count;
 483 }
 484
 485 static gboolean
 486 g_buffered_output_stream_flush (GOutputStream  *stream,
 487                                 GCancellable   *cancellable,
 488                                 GError        **error)
 489 {
 490   GBufferedOutputStream *bstream;
 491   GOutputStream                *base_stream;
 492   gboolean res;
 493
 494   bstream = G_BUFFERED_OUTPUT_STREAM (stream);
 495   base_stream = G_FILTER_OUTPUT_STREAM (stream)->base_stream;
 496
 497   res = flush_buffer (bstream, cancellable, error);
 498
 499   if (res == FALSE)
 500     return FALSE;
 501
 502   res = g_output_stream_flush (base_stream, cancellable, error);
 503
 504   return res;
 505 }
 506
 507 static gboolean
 508 g_buffered_output_stream_close (GOutputStream  *stream,
 509                                 GCancellable   *cancellable,
 510                                 GError        **error)
 511 {
 512   GBufferedOutputStream        *bstream;
 513   GOutputStream                *base_stream;
 514   gboolean                      res;
 515
 516   bstream = G_BUFFERED_OUTPUT_STREAM (stream);
 517   base_stream = G_FILTER_OUTPUT_STREAM (bstream)->base_stream;
 518   res = flush_buffer (bstream, cancellable, error);
 519
 520   if (g_filter_output_stream_get_close_base_stream (G_FILTER_OUTPUT_STREAM (stream)))
 521     {
 522       /* report the first error but still close the stream */
 523       if (res)
 524         res = g_output_stream_close (base_stream, cancellable, error);
 525       else
 526         g_output_stream_close (base_stream, cancellable, NULL);
 527     }
 528
 529   return res;
 530 }
 531
 532 static goffset
 533 g_buffered_output_stream_tell (GSeekable *seekable)
 534 {
 535   GBufferedOutputStream        *bstream;
 536   GBufferedOutputStreamPrivate *priv;
 537   GOutputStream *base_stream;
 538   GSeekable    *base_stream_seekable;
 539   goffset base_offset;
 540
 541   bstream = G_BUFFERED_OUTPUT_STREAM (seekable);
 542   priv = bstream->priv;
 543
 544   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 545   if (!G_IS_SEEKABLE (base_stream))
 546     return 0;
 547
 548   base_stream_seekable = G_SEEKABLE (base_stream);
 549
 550   base_offset = g_seekable_tell (base_stream_seekable);
 551   return base_offset + priv->pos;
 552 }
 553
 554 static gboolean
 555 g_buffered_output_stream_can_seek (GSeekable *seekable)
 556 {
 557   GOutputStream *base_stream;
 558
 559   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 560   return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream));
 561 }
 562
 563 static gboolean
 564 g_buffered_output_stream_seek (GSeekable     *seekable,
 565                                goffset        offset,
 566                                GSeekType      type,
 567                                GCancellable  *cancellable,
 568                                GError       **error)
 569 {
 570   GBufferedOutputStream *bstream;
 571   GOutputStream *base_stream;
 572   GSeekable *base_stream_seekable;
 573   gboolean flushed;
 574
 575   bstream = G_BUFFERED_OUTPUT_STREAM (seekable);
 576
 577   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 578   if (!G_IS_SEEKABLE (base_stream))
 579     {
 580       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 581                            _("Seek not supported on base stream"));
 582       return FALSE;
 583     }
 584
 585   base_stream_seekable = G_SEEKABLE (base_stream);
 586   flushed = flush_buffer (bstream, cancellable, error);
 587   if (!flushed)
 588     return FALSE;
 589
 590   return g_seekable_seek (base_stream_seekable, offset, type, cancellable, error);
 591 }
 592
 593 static gboolean
 594 g_buffered_output_stream_can_truncate (GSeekable *seekable)
 595 {
 596   GOutputStream *base_stream;
 597
 598   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 599   return G_IS_SEEKABLE (base_stream) && g_seekable_can_truncate (G_SEEKABLE (base_stream));
 600 }
 601
 602 static gboolean
 603 g_buffered_output_stream_truncate (GSeekable     *seekable,
 604                                    goffset        offset,
 605                                    GCancellable  *cancellable,
 606                                    GError       **error)
 607 {
 608   GBufferedOutputStream        *bstream;
 609   GOutputStream *base_stream;
 610   GSeekable *base_stream_seekable;
 611   gboolean flushed;
 612
 613   bstream = G_BUFFERED_OUTPUT_STREAM (seekable);
 614   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 615   if (!G_IS_SEEKABLE (base_stream))
 616     {
 617       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 618                            _("Truncate not supported on base stream"));
 619       return FALSE;
 620     }
 621
 622   base_stream_seekable = G_SEEKABLE (base_stream);
 623
 624   flushed = flush_buffer (bstream, cancellable, error);
 625   if (!flushed)
 626     return FALSE;
 627   return g_seekable_truncate (base_stream_seekable, offset, cancellable, error);
 628 }
 629
 630 /* ************************** */
 631 /* Async stuff implementation */
 632 /* ************************** */
 633
 634 /* TODO: This should be using the base class async ops, not threads */
 635
 636 typedef struct {
 637
 638   guint flush_stream : 1;
 639   guint close_stream : 1;
 640
 641 } FlushData;
 642
 643 static void
 644 free_flush_data (gpointer data)
 645 {
 646   g_slice_free (FlushData, data);
 647 }
 648
 649 /* This function is used by all three (i.e.
 650  * _write, _flush, _close) functions since
 651  * all of them will need to flush the buffer
 652  * and so closing and writing is just a special
 653  * case of flushing + some addition stuff */
 654 static void
 655 flush_buffer_thread (GTask        *task,
 656                      gpointer      object,
 657                      gpointer      task_data,
 658                      GCancellable *cancellable)
 659 {
 660   GBufferedOutputStream *stream;
 661   GOutputStream *base_stream;
 662   FlushData     *fdata;
 663   gboolean       res;
 664   GError        *error = NULL;
 665
 666   stream = G_BUFFERED_OUTPUT_STREAM (object);
 667   fdata = task_data;
 668   base_stream = G_FILTER_OUTPUT_STREAM (stream)->base_stream;
 669
 670   res = flush_buffer (stream, cancellable, &error);
 671
 672   /* if flushing the buffer didn't work don't even bother
 673    * to flush the stream but just report that error */
 674   if (res && fdata->flush_stream)
 675     res = g_output_stream_flush (base_stream, cancellable, &error);
 676
 677   if (fdata->close_stream)
 678     {
 679
 680       /* if flushing the buffer or the stream returned
 681        * an error report that first error but still try
 682        * close the stream */
 683       if (g_filter_output_stream_get_close_base_stream (G_FILTER_OUTPUT_STREAM (stream)))
 684         {
 685           if (res == FALSE)
 686             g_output_stream_close (base_stream, cancellable, NULL);
 687           else
 688             res = g_output_stream_close (base_stream, cancellable, &error);
 689         }
 690     }
 691
 692   if (res == FALSE)
 693     g_task_return_error (task, error);
 694   else
 695     g_task_return_boolean (task, TRUE);
 696 }
 697
 698 static void
 699 g_buffered_output_stream_flush_async (GOutputStream        *stream,
 700                                       int                   io_priority,
 701                                       GCancellable         *cancellable,
 702                                       GAsyncReadyCallback   callback,
 703                                       gpointer              data)
 704 {
 705   GTask *task;
 706   FlushData *fdata;
 707
 708   fdata = g_slice_new (FlushData);
 709   fdata->flush_stream = TRUE;
 710   fdata->close_stream = FALSE;
 711
 712   task = g_task_new (stream, cancellable, callback, data);
 713   g_task_set_task_data (task, fdata, free_flush_data);
 714   g_task_set_priority (task, io_priority);
 715
 716   g_task_run_in_thread (task, flush_buffer_thread);
 717   g_object_unref (task);
 718 }
 719
 720 static gboolean
 721 g_buffered_output_stream_flush_finish (GOutputStream        *stream,
 722                                        GAsyncResult         *result,
 723                                        GError              **error)
 724 {
 725   g_return_val_if_fail (g_task_is_valid (result, stream), FALSE);
 726
 727   return g_task_propagate_boolean (G_TASK (result), error);
 728 }
 729
 730 static void
 731 g_buffered_output_stream_close_async (GOutputStream        *stream,
 732                                       int                   io_priority,
 733                                       GCancellable         *cancellable,
 734                                       GAsyncReadyCallback   callback,
 735                                       gpointer              data)
 736 {
 737   GTask *task;
 738   FlushData *fdata;
 739
 740   fdata = g_slice_new (FlushData);
 741   fdata->close_stream = TRUE;
 742
 743   task = g_task_new (stream, cancellable, callback, data);
 744   g_task_set_task_data (task, fdata, free_flush_data);
 745   g_task_set_priority (task, io_priority);
 746
 747   g_task_run_in_thread (task, flush_buffer_thread);
 748   g_object_unref (task);
 749 }
 750
 751 static gboolean
 752 g_buffered_output_stream_close_finish (GOutputStream        *stream,
 753                                        GAsyncResult         *result,
 754                                        GError              **error)
 755 {
 756   g_return_val_if_fail (g_task_is_valid (result, stream), FALSE);
 757
 758   return g_task_propagate_boolean (G_TASK (result), error);
 759 }