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_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
  81                                                 g_data_output_stream_seekable_iface_init))
  82
  83
  84 static void
  85 g_data_output_stream_class_init (GDataOutputStreamClass *klass)
  86 {
  87   GObjectClass *object_class;
  88
  89   g_type_class_add_private (klass, sizeof (GDataOutputStreamPrivate));
  90
  91   object_class = G_OBJECT_CLASS (klass);
  92   object_class->get_property = g_data_output_stream_get_property;
  93   object_class->set_property = g_data_output_stream_set_property;
  94
  95   /**
  96    * GDataOutputStream:byte-order:
  97    *
  98    * Determines the byte ordering that is used when writing
  99    * multi-byte entities (such as integers) to the stream.
 100    */
 101   g_object_class_install_property (object_class,
 102                                    PROP_BYTE_ORDER,
 103                                    g_param_spec_enum ("byte-order",
 104                                                       P_("Byte order"),
 105                                                       P_("The byte order"),
 106                                                       G_TYPE_DATA_STREAM_BYTE_ORDER,
 107                                                       G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN,
 108                                                       G_PARAM_READWRITE|G_PARAM_STATIC_NAME|G_PARAM_STATIC_BLURB));
 109
 110 }
 111
 112 static void
 113 g_data_output_stream_set_property (GObject     *object,
 114                                   guint         prop_id,
 115                                   const GValue *value,
 116                                   GParamSpec   *pspec)
 117 {
 118   GDataOutputStream *dstream;
 119
 120   dstream = G_DATA_OUTPUT_STREAM (object);
 121
 122   switch (prop_id)
 123     {
 124     case PROP_BYTE_ORDER:
 125       g_data_output_stream_set_byte_order (dstream, g_value_get_enum (value));
 126       break;
 127
 128     default:
 129       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 130       break;
 131     }
 132 }
 133
 134 static void
 135 g_data_output_stream_get_property (GObject    *object,
 136                                    guint       prop_id,
 137                                    GValue     *value,
 138                                    GParamSpec *pspec)
 139 {
 140   GDataOutputStreamPrivate *priv;
 141   GDataOutputStream        *dstream;
 142
 143   dstream = G_DATA_OUTPUT_STREAM (object);
 144   priv = dstream->priv;
 145
 146   switch (prop_id)
 147     {
 148     case PROP_BYTE_ORDER:
 149       g_value_set_enum (value, priv->byte_order);
 150       break;
 151
 152     default:
 153       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 154       break;
 155     }
 156 }
 157
 158 static void
 159 g_data_output_stream_init (GDataOutputStream *stream)
 160 {
 161   stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
 162                                               G_TYPE_DATA_OUTPUT_STREAM,
 163                                               GDataOutputStreamPrivate);
 164
 165   stream->priv->byte_order = G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN;
 166 }
 167
 168 static void
 169 g_data_output_stream_seekable_iface_init (GSeekableIface *iface)
 170 {
 171   iface->tell         = g_data_output_stream_tell;
 172   iface->can_seek     = g_data_output_stream_can_seek;
 173   iface->seek         = g_data_output_stream_seek;
 174   iface->can_truncate = g_data_output_stream_can_truncate;
 175   iface->truncate_fn  = g_data_output_stream_truncate;
 176 }
 177
 178 /**
 179  * g_data_output_stream_new:
 180  * @base_stream: a #GOutputStream.
 181  *
 182  * Creates a new data output stream for @base_stream.
 183  *
 184  * Returns: #GDataOutputStream.
 185  **/
 186 GDataOutputStream *
 187 g_data_output_stream_new (GOutputStream *base_stream)
 188 {
 189   GDataOutputStream *stream;
 190
 191   g_return_val_if_fail (G_IS_OUTPUT_STREAM (base_stream), NULL);
 192
 193   stream = g_object_new (G_TYPE_DATA_OUTPUT_STREAM,
 194                          "base-stream", base_stream,
 195                          NULL);
 196
 197   return stream;
 198 }
 199
 200 /**
 201  * g_data_output_stream_set_byte_order:
 202  * @stream: a #GDataOutputStream.
 203  * @order: a %GDataStreamByteOrder.
 204  *
 205  * Sets the byte order of the data output stream to @order.
 206  **/
 207 void
 208 g_data_output_stream_set_byte_order (GDataOutputStream    *stream,
 209                                      GDataStreamByteOrder  order)
 210 {
 211   GDataOutputStreamPrivate *priv;
 212   g_return_if_fail (G_IS_DATA_OUTPUT_STREAM (stream));
 213   priv = stream->priv;
 214   if (priv->byte_order != order)
 215     {
 216       priv->byte_order = order;
 217       g_object_notify (G_OBJECT (stream), "byte-order");
 218     }
 219 }
 220
 221 /**
 222  * g_data_output_stream_get_byte_order:
 223  * @stream: a #GDataOutputStream.
 224  *
 225  * Gets the byte order for the stream.
 226  *
 227  * Returns: the #GDataStreamByteOrder for the @stream.
 228  **/
 229 GDataStreamByteOrder
 230 g_data_output_stream_get_byte_order (GDataOutputStream *stream)
 231 {
 232   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN);
 233
 234   return stream->priv->byte_order;
 235 }
 236
 237 /**
 238  * g_data_output_stream_put_byte:
 239  * @stream: a #GDataOutputStream.
 240  * @data: a #guchar.
 241  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 242  * @error: a #GError, %NULL to ignore.
 243  *
 244  * Puts a byte into the output stream.
 245  *
 246  * Returns: %TRUE if @data was successfully added to the @stream.
 247  **/
 248 gboolean
 249 g_data_output_stream_put_byte (GDataOutputStream  *stream,
 250                                guchar              data,
 251                                GCancellable       *cancellable,
 252                                GError            **error)
 253 {
 254   gsize bytes_written;
 255
 256   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 257
 258   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 259                                     &data, 1,
 260                                     &bytes_written,
 261                                     cancellable, error);
 262 }
 263
 264 /**
 265  * g_data_output_stream_put_int16:
 266  * @stream: a #GDataOutputStream.
 267  * @data: a #gint16.
 268  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 269  * @error: a #GError, %NULL to ignore.
 270  *
 271  * Puts a signed 16-bit integer into the output stream.
 272  *
 273  * Returns: %TRUE if @data was successfully added to the @stream.
 274  **/
 275 gboolean
 276 g_data_output_stream_put_int16 (GDataOutputStream  *stream,
 277                                 gint16              data,
 278                                 GCancellable       *cancellable,
 279                                 GError            **error)
 280 {
 281   gsize bytes_written;
 282
 283   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 284
 285   switch (stream->priv->byte_order)
 286     {
 287     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 288       data = GINT16_TO_BE (data);
 289       break;
 290     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 291       data = GINT16_TO_LE (data);
 292       break;
 293     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 294     default:
 295       break;
 296     }
 297
 298   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 299                                     &data, 2,
 300                                     &bytes_written,
 301                                     cancellable, error);
 302 }
 303
 304 /**
 305  * g_data_output_stream_put_uint16:
 306  * @stream: a #GDataOutputStream.
 307  * @data: a #guint16.
 308  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 309  * @error: a #GError, %NULL to ignore.
 310  *
 311  * Puts an unsigned 16-bit integer into the output stream.
 312  *
 313  * Returns: %TRUE if @data was successfully added to the @stream.
 314  **/
 315 gboolean
 316 g_data_output_stream_put_uint16 (GDataOutputStream  *stream,
 317                                  guint16             data,
 318                                  GCancellable       *cancellable,
 319                                  GError            **error)
 320 {
 321   gsize bytes_written;
 322
 323   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 324
 325   switch (stream->priv->byte_order)
 326     {
 327     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 328       data = GUINT16_TO_BE (data);
 329       break;
 330     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 331       data = GUINT16_TO_LE (data);
 332       break;
 333     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 334     default:
 335       break;
 336     }
 337
 338   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 339                                     &data, 2,
 340                                     &bytes_written,
 341                                     cancellable, error);
 342 }
 343
 344 /**
 345  * g_data_output_stream_put_int32:
 346  * @stream: a #GDataOutputStream.
 347  * @data: a #gint32.
 348  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 349  * @error: a #GError, %NULL to ignore.
 350  *
 351  * Puts a signed 32-bit integer into the output stream.
 352  *
 353  * Returns: %TRUE if @data was successfully added to the @stream.
 354  **/
 355 gboolean
 356 g_data_output_stream_put_int32 (GDataOutputStream  *stream,
 357                                 gint32              data,
 358                                 GCancellable       *cancellable,
 359                                 GError            **error)
 360 {
 361   gsize bytes_written;
 362
 363   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 364
 365   switch (stream->priv->byte_order)
 366     {
 367     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 368       data = GINT32_TO_BE (data);
 369       break;
 370     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 371       data = GINT32_TO_LE (data);
 372       break;
 373     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 374     default:
 375       break;
 376     }
 377
 378   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 379                                     &data, 4,
 380                                     &bytes_written,
 381                                     cancellable, error);
 382 }
 383
 384 /**
 385  * g_data_output_stream_put_uint32:
 386  * @stream: a #GDataOutputStream.
 387  * @data: a #guint32.
 388  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 389  * @error: a #GError, %NULL to ignore.
 390  *
 391  * Puts an unsigned 32-bit integer into the stream.
 392  *
 393  * Returns: %TRUE if @data was successfully added to the @stream.
 394  **/
 395 gboolean
 396 g_data_output_stream_put_uint32 (GDataOutputStream  *stream,
 397                                  guint32             data,
 398                                  GCancellable       *cancellable,
 399                                  GError            **error)
 400 {
 401   gsize bytes_written;
 402
 403   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 404
 405   switch (stream->priv->byte_order)
 406     {
 407     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 408       data = GUINT32_TO_BE (data);
 409       break;
 410     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 411       data = GUINT32_TO_LE (data);
 412       break;
 413     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 414     default:
 415       break;
 416     }
 417
 418   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 419                                     &data, 4,
 420                                     &bytes_written,
 421                                     cancellable, error);
 422 }
 423
 424 /**
 425  * g_data_output_stream_put_int64:
 426  * @stream: a #GDataOutputStream.
 427  * @data: a #gint64.
 428  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 429  * @error: a #GError, %NULL to ignore.
 430  *
 431  * Puts a signed 64-bit integer into the stream.
 432  *
 433  * Returns: %TRUE if @data was successfully added to the @stream.
 434  **/
 435 gboolean
 436 g_data_output_stream_put_int64 (GDataOutputStream  *stream,
 437                                 gint64              data,
 438                                 GCancellable       *cancellable,
 439                                 GError            **error)
 440 {
 441   gsize bytes_written;
 442
 443   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 444
 445   switch (stream->priv->byte_order)
 446     {
 447     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 448       data = GINT64_TO_BE (data);
 449       break;
 450     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 451       data = GINT64_TO_LE (data);
 452       break;
 453     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 454     default:
 455       break;
 456     }
 457
 458   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 459                                     &data, 8,
 460                                     &bytes_written,
 461                                     cancellable, error);
 462 }
 463
 464 /**
 465  * g_data_output_stream_put_uint64:
 466  * @stream: a #GDataOutputStream.
 467  * @data: a #guint64.
 468  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 469  * @error: a #GError, %NULL to ignore.
 470  *
 471  * Puts an unsigned 64-bit integer into the stream.
 472  *
 473  * Returns: %TRUE if @data was successfully added to the @stream.
 474  **/
 475 gboolean
 476 g_data_output_stream_put_uint64 (GDataOutputStream  *stream,
 477                                  guint64             data,
 478                                  GCancellable       *cancellable,
 479                                  GError            **error)
 480 {
 481   gsize bytes_written;
 482
 483   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 484
 485   switch (stream->priv->byte_order)
 486     {
 487     case G_DATA_STREAM_BYTE_ORDER_BIG_ENDIAN:
 488       data = GUINT64_TO_BE (data);
 489       break;
 490     case G_DATA_STREAM_BYTE_ORDER_LITTLE_ENDIAN:
 491       data = GUINT64_TO_LE (data);
 492       break;
 493     case G_DATA_STREAM_BYTE_ORDER_HOST_ENDIAN:
 494     default:
 495       break;
 496     }
 497
 498   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 499                                     &data, 8,
 500                                     &bytes_written,
 501                                     cancellable, error);
 502 }
 503
 504 /**
 505  * g_data_output_stream_put_string:
 506  * @stream: a #GDataOutputStream.
 507  * @str: a string.
 508  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 509  * @error: a #GError, %NULL to ignore.
 510  *
 511  * Puts a string into the output stream.
 512  *
 513  * Returns: %TRUE if @string was successfully added to the @stream.
 514  **/
 515 gboolean
 516 g_data_output_stream_put_string (GDataOutputStream  *stream,
 517                                  const char         *str,
 518                                  GCancellable       *cancellable,
 519                                  GError            **error)
 520 {
 521   gsize bytes_written;
 522
 523   g_return_val_if_fail (G_IS_DATA_OUTPUT_STREAM (stream), FALSE);
 524   g_return_val_if_fail (str != NULL, FALSE);
 525
 526   return g_output_stream_write_all (G_OUTPUT_STREAM (stream),
 527                                     str, strlen (str),
 528                                     &bytes_written,
 529                                     cancellable, error);
 530 }
 531
 532 static goffset
 533 g_data_output_stream_tell (GSeekable *seekable)
 534 {
 535   GOutputStream *base_stream;
 536   GSeekable *base_stream_seekable;
 537
 538   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 539   if (!G_IS_SEEKABLE (base_stream))
 540     return 0;
 541   base_stream_seekable = G_SEEKABLE (base_stream);
 542   return g_seekable_tell (base_stream_seekable);
 543 }
 544
 545 static gboolean
 546 g_data_output_stream_can_seek (GSeekable *seekable)
 547 {
 548   GOutputStream *base_stream;
 549
 550   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 551   return G_IS_SEEKABLE (base_stream) && g_seekable_can_seek (G_SEEKABLE (base_stream));
 552 }
 553
 554 static gboolean
 555 g_data_output_stream_seek (GSeekable     *seekable,
 556                            goffset        offset,
 557                            GSeekType      type,
 558                            GCancellable  *cancellable,
 559                            GError       **error)
 560 {
 561   GOutputStream *base_stream;
 562   GSeekable *base_stream_seekable;
 563
 564   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 565   if (!G_IS_SEEKABLE (base_stream))
 566     {
 567       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 568                            _("Seek not supported on base stream"));
 569       return FALSE;
 570     }
 571
 572   base_stream_seekable = G_SEEKABLE (base_stream);
 573   return g_seekable_seek (base_stream_seekable, offset, type, cancellable, error);
 574 }
 575
 576 static gboolean
 577 g_data_output_stream_can_truncate (GSeekable *seekable)
 578 {
 579   GOutputStream *base_stream;
 580
 581   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 582   return G_IS_SEEKABLE (base_stream) && g_seekable_can_truncate (G_SEEKABLE (base_stream));
 583 }
 584
 585 static gboolean
 586 g_data_output_stream_truncate (GSeekable     *seekable,
 587                                    goffset        offset,
 588                                    GCancellable  *cancellable,
 589                                    GError       **error)
 590 {
 591   GOutputStream *base_stream;
 592   GSeekable *base_stream_seekable;
 593
 594   base_stream = G_FILTER_OUTPUT_STREAM (seekable)->base_stream;
 595   if (!G_IS_SEEKABLE (base_stream))
 596     {
 597       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 598                            _("Truncate not supported on base stream"));
 599       return FALSE;
 600     }
 601
 602   base_stream_seekable = G_SEEKABLE (base_stream);
 603   return g_seekable_truncate (base_stream_seekable, offset, cancellable, error);
 604 }