gio/gdataoutputstream.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: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24 #include <string.h>
  25 #include "gdataoutputstream.h"
  26 #include "gseekable.h"
  27 #include "gioenumtypes.h"
  28 #include "gioerror.h"
  29 #include "glibintl.h"
  30
  31
  32 /**
  33  * SECTION:gdataoutputstream
  34  * @short_description: Data Output Stream
  35  * @include: gio/gio.h
  36  * @see_also: #GOutputStream
  37  *
  38  * Data output stream implements #GOutputStream and includes functions for
  39  * writing data directly to an output stream.
  40  *
  41  **/
  42
  43
  44
  45 struct _GDataOutputStreamPrivate {
  46   GDataStreamByteOrder byte_order;
  47 };
  48
  49 enum {
  50   PROP_0,
  51   PROP_BYTE_ORDER
  52 };
  53
  54 static void g_data_output_stream_set_property (GObject      *object,
  55                                                guint         prop_id,
  56                                                const GValue *value,
  57                                                GParamSpec   *pspec);
  58 static void g_data_output_stream_get_property (GObject      *object,
  59                                                guint         prop_id,
  60                                                GValue       *value,
  61                                                GParamSpec   *pspec);
  62
  63 static void     g_data_output_stream_seekable_iface_init (GSeekableIface  *iface);
  64 static goffset  g_data_output_stream_tell                (GSeekable       *seekable);
  65 static gboolean g_data_output_stream_can_seek            (GSeekable       *seekable);
  66 static gboolean g_data_output_stream_seek                (GSeekable       *seekable,
  67                                                           goffset          offset,
  68                                                           GSeekType        type,
  69                                                           GCancellable    *cancellable,
  70                                                           GError         **error);
  71 static gboolean g_data_output_stream_can_truncate        (GSeekable       *seekable);
  72 static gboolean g_data_output_stream_truncate            (GSeekable       *seekable,
  73                                                           goffset          offset,
  74                                                           GCancellable    *cancellable,
  75                                                           GError         **error);
  76
  77 G_DEFINE_TYPE_WITH_CODE (GDataOutputStream,
  78                          g_data_output_stream,
  79                          G_TYPE_FILTER_OUTPUT_STREAM,
  80                          G_ADD_PRIVATE (GDataOutputStream)
  81                          G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
  82                                                 g_data_output_stream_seekable_iface_init))
  83
  84
  85 static void
  86 g_data_output_stream_class_init (GDataOutputStreamClass *klass)
  87 {
  88   GObjectClass *object_class;
  89
  90   object_class = G_OBJECT_CLASS (klass);
  91   object_class->get_property = g_data_output_stream_get_property;
  92   object_class->set_property = g_data_output_stream_set_property;
  93
  94   /**
  95    * GDataOutputStream:byte-order:
  96    *
  97    * Determines the byte ordering that is used when writing
  98    * multi-byte entities (such as integers) to the stream.
  99    */
 100   g_object_class_install_property (object_class,
 101                                    PROP_BYTE_ORDER,
 102                                    g_param_spec_enum ("byte-order",
 103                                                       P_("Byte order"),
 104                                                       P_("The byte order"),
 105                                                       G_TYPE_DATA_STREAM_BYTE_ORDER,
 106                                                       G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN,
 107                                                       G_PARAM_READWRITE|G_PARAM_STATIC_NAME|G_PARAM_STATIC_BLURB));
 108
 109 }
 110
 111 static void
 112 g_data_output_stream_set_property (GObject     *object,
 113                                   guint         prop_id,
 114                                   const GValue *value,
 115                                   GParamSpec   *pspec)
 116 {
 117   GDataOutputStream *dstream;
 118
 119   dstream = G_DATA_OUTPUT_STREAM (object);
 120
 121   switch (prop_id)
 122     {
 123     case PROP_BYTE_ORDER:
 124       g_data_output_stream_set_byte_order (dstream, g_value_get_enum (value));
 125       break;
 126
 127     default:
 128       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 129       break;
 130     }
 131 }
 132
 133 static void
 134 g_data_output_stream_get_property (GObject    *object,
 135                                    guint       prop_id,
 136                                    GValue     *value,
 137                                    GParamSpec *pspec)
 138 {
 139   GDataOutputStreamPrivate *priv;
 140   GDataOutputStream        *dstream;
 141
 142   dstream = G_DATA_OUTPUT_STREAM (object);
 143   priv = dstream->priv;
 144
 145   switch (prop_id)
 146     {
 147     case PROP_BYTE_ORDER:
 148       g_value_set_enum (value, priv->byte_order);
 149       break;
 150
 151     default:
 152       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 153       break;
 154     }
 155 }
 156
 157 static void
 158 g_data_output_stream_init (GDataOutputStream *stream)
 159 {
 160   stream->priv = g_data_output_stream_get_instance_private (stream);
 161   stream->priv->byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
 162 }
 163
 164 static void
 165 g_data_output_stream_seekable_iface_init (GSeekableIface *iface)
 166 {
 167   iface->tell         = g_data_output_stream_tell;
 168   iface->can_seek     = g_data_output_stream_can_seek;
 169   iface->seek         = g_data_output_stream_seek;
 170   iface->can_truncate = g_data_output_stream_can_truncate;
 171   iface->truncate_fn  = g_data_output_stream_truncate;
 172 }
 173
 174 /**
 175  * g_data_output_stream_new:
 176  * @base_stream: a #GOutputStream.
 177  *
 178  * Creates a new data output stream for @base_stream.
 179  *
 180  * Returns: #GDataOutputStream.
 181  **/
 182 GDataOutputStream *
 183 g_data_output_stream_new (GOutputStream *base_stream)
 184 {
 185   GDataOutputStream *stream;
 186
 187   g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);
 188
 189   stream = g_object_new (G_TYPE_DATA_OUTPUT_STREAM,
 190                          "base-stream", base_stream,
 191                          NULL);
 192
 193   return stream;
 194 }
 195
 196 /**
 197  * g_data_output_stream_set_byte_order:
 198  * @stream: a #GDataOutputStream.
 199  * @order: a %GDataStreamByteOrder.
 200  *
 201  * Sets the byte order of the data output stream to @order.
 202  **/
 203 void
 204 g_data_output_stream_set_byte_order (GDataOutputStream    *stream,
 205                                      GDataStreamByteOrder  order)
 206 {
 207   GDataOutputStreamPrivate *priv;
 208   g_return_if_fail (G_IS_DATA_OUTPUT_STREAM (stream));
 209   priv = stream->priv;
 210   if (priv->byte_order != order)
 211     {
 212       priv->byte_order = order;
 213       g_object_notify (G_OBJECT (stream), "byte-order");
 214     }
 215 }
 216
 217 /**
 218  * g_data_output_stream_get_byte_order:
 219  * @stream: a #GDataOutputStream.
 220  *
 221  * Gets the byte order for the stream.
 222  *
 223  * Returns: the #GDataStreamByteOrder for the @stream.
 224  **/
 225 GDataStreamByteOrder
 226 g_data_output_stream_get_byte_order (GDataOutputStream *stream)
 227 {
 228   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN);
 229
 230   return stream->priv->byte_order;
 231 }
 232
 233 /**
 234  * g_data_output_stream_put_byte:
 235  * @stream: a #GDataOutputStream.
 236  * @data: a #guchar.
 237  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 238  * @error: a #GError, %NULL to ignore.
 239  *
 240  * Puts a byte into the output stream.
 241  *
 242  * Returns: %TRUE if @data was successfully added to the @stream.
 243  **/
 244 gboolean
 245 g_data_output_stream_put_byte (GDataOutputStream  *stream,
 246                                guchar              data,
 247                                GCancellable       *cancellable,
 248                                GError            **error)
 249 {
 250   gsize bytes_written;
 251
 252   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 253
 254   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 255                                     &data, 1,
 256                                     &bytes_written,
 257                                     cancellable, error);
 258 }
 259
 260 /**
 261  * g_data_output_stream_put_int16:
 262  * @stream: a #GDataOutputStream.
 263  * @data: a #gint16.
 264  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 265  * @error: a #GError, %NULL to ignore.
 266  *
 267  * Puts a signed 16-bit integer into the output stream.
 268  *
 269  * Returns: %TRUE if @data was successfully added to the @stream.
 270  **/
 271 gboolean
 272 g_data_output_stream_put_int16 (GDataOutputStream  *stream,
 273                                 gint16              data,
 274                                 GCancellable       *cancellable,
 275                                 GError            **error)
 276 {
 277   gsize bytes_written;
 278
 279   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 280
 281   switch (stream->priv->byte_order)
 282     {
 283     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 284       data = GINT16_TO_BE (data);
 285       break;
 286     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 287       data = GINT16_TO_LE (data);
 288       break;
 289     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 290     default:
 291       break;
 292     }
 293
 294   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 295                                     &data, 2,
 296                                     &bytes_written,
 297                                     cancellable, error);
 298 }
 299
 300 /**
 301  * g_data_output_stream_put_uint16:
 302  * @stream: a #GDataOutputStream.
 303  * @data: a #guint16.
 304  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 305  * @error: a #GError, %NULL to ignore.
 306  *
 307  * Puts an unsigned 16-bit integer into the output stream.
 308  *
 309  * Returns: %TRUE if @data was successfully added to the @stream.
 310  **/
 311 gboolean
 312 g_data_output_stream_put_uint16 (GDataOutputStream  *stream,
 313                                  guint16             data,
 314                                  GCancellable       *cancellable,
 315                                  GError            **error)
 316 {
 317   gsize bytes_written;
 318
 319   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 320
 321   switch (stream->priv->byte_order)
 322     {
 323     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 324       data = GUINT16_TO_BE (data);
 325       break;
 326     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 327       data = GUINT16_TO_LE (data);
 328       break;
 329     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 330     default:
 331       break;
 332     }
 333
 334   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 335                                     &data, 2,
 336                                     &bytes_written,
 337                                     cancellable, error);
 338 }
 339
 340 /**
 341  * g_data_output_stream_put_int32:
 342  * @stream: a #GDataOutputStream.
 343  * @data: a #gint32.
 344  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 345  * @error: a #GError, %NULL to ignore.
 346  *
 347  * Puts a signed 32-bit integer into the output stream.
 348  *
 349  * Returns: %TRUE if @data was successfully added to the @stream.
 350  **/
 351 gboolean
 352 g_data_output_stream_put_int32 (GDataOutputStream  *stream,
 353                                 gint32              data,
 354                                 GCancellable       *cancellable,
 355                                 GError            **error)
 356 {
 357   gsize bytes_written;
 358
 359   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 360
 361   switch (stream->priv->byte_order)
 362     {
 363     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 364       data = GINT32_TO_BE (data);
 365       break;
 366     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 367       data = GINT32_TO_LE (data);
 368       break;
 369     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 370     default:
 371       break;
 372     }
 373
 374   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 375                                     &data, 4,
 376                                     &bytes_written,
 377                                     cancellable, error);
 378 }
 379
 380 /**
 381  * g_data_output_stream_put_uint32:
 382  * @stream: a #GDataOutputStream.
 383  * @data: a #guint32.
 384  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 385  * @error: a #GError, %NULL to ignore.
 386  *
 387  * Puts an unsigned 32-bit integer into the stream.
 388  *
 389  * Returns: %TRUE if @data was successfully added to the @stream.
 390  **/
 391 gboolean
 392 g_data_output_stream_put_uint32 (GDataOutputStream  *stream,
 393                                  guint32             data,
 394                                  GCancellable       *cancellable,
 395                                  GError            **error)
 396 {
 397   gsize bytes_written;
 398
 399   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 400
 401   switch (stream->priv->byte_order)
 402     {
 403     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 404       data = GUINT32_TO_BE (data);
 405       break;
 406     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 407       data = GUINT32_TO_LE (data);
 408       break;
 409     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 410     default:
 411       break;
 412     }
 413
 414   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 415                                     &data, 4,
 416                                     &bytes_written,
 417                                     cancellable, error);
 418 }
 419
 420 /**
 421  * g_data_output_stream_put_int64:
 422  * @stream: a #GDataOutputStream.
 423  * @data: a #gint64.
 424  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 425  * @error: a #GError, %NULL to ignore.
 426  *
 427  * Puts a signed 64-bit integer into the stream.
 428  *
 429  * Returns: %TRUE if @data was successfully added to the @stream.
 430  **/
 431 gboolean
 432 g_data_output_stream_put_int64 (GDataOutputStream  *stream,
 433                                 gint64              data,
 434                                 GCancellable       *cancellable,
 435                                 GError            **error)
 436 {
 437   gsize bytes_written;
 438
 439   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 440
 441   switch (stream->priv->byte_order)
 442     {
 443     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 444       data = GINT64_TO_BE (data);
 445       break;
 446     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 447       data = GINT64_TO_LE (data);
 448       break;
 449     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 450     default:
 451       break;
 452     }
 453
 454   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 455                                     &data, 8,
 456                                     &bytes_written,
 457                                     cancellable, error);
 458 }
 459
 460 /**
 461  * g_data_output_stream_put_uint64:
 462  * @stream: a #GDataOutputStream.
 463  * @data: a #guint64.
 464  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 465  * @error: a #GError, %NULL to ignore.
 466  *
 467  * Puts an unsigned 64-bit integer into the stream.
 468  *
 469  * Returns: %TRUE if @data was successfully added to the @stream.
 470  **/
 471 gboolean
 472 g_data_output_stream_put_uint64 (GDataOutputStream  *stream,
 473                                  guint64             data,
 474                                  GCancellable       *cancellable,
 475                                  GError            **error)
 476 {
 477   gsize bytes_written;
 478
 479   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 480
 481   switch (stream->priv->byte_order)
 482     {
 483     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 484       data = GUINT64_TO_BE (data);
 485       break;
 486     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 487       data = GUINT64_TO_LE (data);
 488       break;
 489     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 490     default:
 491       break;
 492     }
 493
 494   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 495                                     &data, 8,
 496                                     &bytes_written,
 497                                     cancellable, error);
 498 }
 499
 500 /**
 501  * g_data_output_stream_put_string:
 502  * @stream: a #GDataOutputStream.
 503  * @str: a string.
 504  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 505  * @error: a #GError, %NULL to ignore.
 506  *
 507  * Puts a string into the output stream.
 508  *
 509  * Returns: %TRUE if @string was successfully added to the @stream.
 510  **/
 511 gboolean
 512 g_data_output_stream_put_string (GDataOutputStream  *stream,
 513                                  const char         *str,
 514                                  GCancellable       *cancellable,
 515                                  GError            **error)
 516 {
 517   gsize bytes_written;
 518
 519   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 520   g_return_val_if_fail (str != NULL, FALSE);
 521
 522   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 523                                     str, strlen (str),
 524                                     &bytes_written,
 525                                     cancellable, error);
 526 }
 527
 528 static goffset
 529 g_data_output_stream_tell (GSeekable *seekable)
 530 {
 531   GOutputStream *base_stream;
 532   GSeekable *base_stream_seekable;
 533
 534   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 535   if (!G_IS_SEEKABLE (base_stream))
 536     return 0;
 537   base_stream_seekable = G_SEEKABLE (base_stream);
 538   return g_seekable_tell (base_stream_seekable);
 539 }
 540
 541 static gboolean
 542 g_data_output_stream_can_seek (GSeekable *seekable)
 543 {
 544   GOutputStream *base_stream;
 545
 546   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 547   return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream));
 548 }
 549
 550 static gboolean
 551 g_data_output_stream_seek (GSeekable     *seekable,
 552                            goffset        offset,
 553                            GSeekType      type,
 554                            GCancellable  *cancellable,
 555                            GError       **error)
 556 {
 557   GOutputStream *base_stream;
 558   GSeekable *base_stream_seekable;
 559
 560   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 561   if (!G_IS_SEEKABLE (base_stream))
 562     {
 563       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 564                            _("Seek not supported on base stream"));
 565       return FALSE;
 566     }
 567
 568   base_stream_seekable = G_SEEKABLE (base_stream);
 569   return g_seekable_seek (base_stream_seekable, offset, type, cancellable, error);
 570 }
 571
 572 static gboolean
 573 g_data_output_stream_can_truncate (GSeekable *seekable)
 574 {
 575   GOutputStream *base_stream;
 576
 577   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 578   return G_IS_SEEKABLE (base_stream) && g_seekable_can_truncate (G_SEEKABLE (base_stream));
 579 }
 580
 581 static gboolean
 582 g_data_output_stream_truncate (GSeekable     *seekable,
 583                                    goffset        offset,
 584                                    GCancellable  *cancellable,
 585                                    GError       **error)
 586 {
 587   GOutputStream *base_stream;
 588   GSeekable *base_stream_seekable;
 589
 590   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 591   if (!G_IS_SEEKABLE (base_stream))
 592     {
 593       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 594                            _("Truncate not supported on base stream"));
 595       return FALSE;
 596     }
 597
 598   base_stream_seekable = G_SEEKABLE (base_stream);
 599   return g_seekable_truncate (base_stream_seekable, offset, cancellable, error);
 600 }