File: gfilterinputstream.c

package info (click to toggle)
glib2.0 2.42.1-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-backports, jessie-kfreebsd, jessie-kfreebsd-proposed-updates
  • size: 82,084 kB
  • sloc: ansic: 411,692; xml: 15,280; sh: 12,977; python: 5,145; makefile: 3,567; perl: 1,422; cpp: 9
file content (309 lines) | stat: -rw-r--r-- 10,442 bytes parent folder | download | duplicates (4)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
/* 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: Christian Kellner <gicmo@gnome.org> 
 */

#include "config.h"
#include "gfilterinputstream.h"
#include "ginputstream.h"
#include "glibintl.h"


/**
 * SECTION:gfilterinputstream
 * @short_description: Filter Input Stream
 * @include: gio/gio.h
 *
 * Base class for input stream implementations that perform some
 * kind of filtering operation on a base stream. Typical examples
 * of filtering operations are character set conversion, compression
 * and byte order flipping.
 **/

enum {
  PROP_0,
  PROP_BASE_STREAM,
  PROP_CLOSE_BASE
};

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

static void     g_filter_input_stream_get_property (GObject      *object,
                                                    guint         prop_id,
                                                    GValue       *value,
                                                    GParamSpec   *pspec);
static void     g_filter_input_stream_finalize     (GObject *object);


static gssize   g_filter_input_stream_read         (GInputStream         *stream,
                                                    void                 *buffer,
                                                    gsize                 count,
                                                    GCancellable         *cancellable,
                                                    GError              **error);
static gssize   g_filter_input_stream_skip         (GInputStream         *stream,
                                                    gsize                 count,
                                                    GCancellable         *cancellable,
                                                    GError              **error);
static gboolean g_filter_input_stream_close        (GInputStream         *stream,
                                                    GCancellable         *cancellable,
                                                    GError              **error);

typedef struct
{
  gboolean close_base;
} GFilterInputStreamPrivate;

G_DEFINE_ABSTRACT_TYPE_WITH_PRIVATE (GFilterInputStream, g_filter_input_stream, G_TYPE_INPUT_STREAM)

static void
g_filter_input_stream_class_init (GFilterInputStreamClass *klass)
{
  GObjectClass *object_class;
  GInputStreamClass *istream_class;

  object_class = G_OBJECT_CLASS (klass);
  object_class->get_property = g_filter_input_stream_get_property;
  object_class->set_property = g_filter_input_stream_set_property;
  object_class->finalize     = g_filter_input_stream_finalize;

  istream_class = G_INPUT_STREAM_CLASS (klass);
  istream_class->read_fn  = g_filter_input_stream_read;
  istream_class->skip  = g_filter_input_stream_skip;
  istream_class->close_fn = g_filter_input_stream_close;

  g_object_class_install_property (object_class,
                                   PROP_BASE_STREAM,
                                   g_param_spec_object ("base-stream",
                                                         P_("The Filter Base Stream"),
                                                         P_("The underlying base stream on which the io ops will be done."),
                                                         G_TYPE_INPUT_STREAM,
                                                         G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | 
                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));

  g_object_class_install_property (object_class,
                                   PROP_CLOSE_BASE,
                                   g_param_spec_boolean ("close-base-stream",
                                                         P_("Close Base Stream"),
                                                         P_("If the base stream should be closed when the filter stream is closed."),
                                                         TRUE, G_PARAM_READWRITE | G_PARAM_CONSTRUCT |
                                                         G_PARAM_STATIC_NAME|G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
}

static void
g_filter_input_stream_set_property (GObject         *object,
                                    guint            prop_id,
                                    const GValue    *value,
                                    GParamSpec      *pspec)
{
  GFilterInputStream *filter_stream;
  GObject *obj;

  filter_stream = G_FILTER_INPUT_STREAM (object);

  switch (prop_id) 
    {
    case PROP_BASE_STREAM:
      obj = g_value_dup_object (value);
      filter_stream->base_stream = G_INPUT_STREAM (obj); 
      break;

    case PROP_CLOSE_BASE:
      g_filter_input_stream_set_close_base_stream (filter_stream,
                                                   g_value_get_boolean (value));
      break;

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

}

static void
g_filter_input_stream_get_property (GObject    *object,
                                    guint       prop_id,
                                    GValue     *value,
                                    GParamSpec *pspec)
{
  GFilterInputStream *filter_stream;
  GFilterInputStreamPrivate *priv;

  filter_stream = G_FILTER_INPUT_STREAM (object);
  priv = g_filter_input_stream_get_instance_private (filter_stream);

  switch (prop_id)
    {
    case PROP_BASE_STREAM:
      g_value_set_object (value, filter_stream->base_stream);
      break;

    case PROP_CLOSE_BASE:
      g_value_set_boolean (value, priv->close_base);
      break;

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

}

static void
g_filter_input_stream_finalize (GObject *object)
{
  GFilterInputStream *stream;

  stream = G_FILTER_INPUT_STREAM (object);

  g_object_unref (stream->base_stream);

  G_OBJECT_CLASS (g_filter_input_stream_parent_class)->finalize (object);
}

static void
g_filter_input_stream_init (GFilterInputStream *stream)
{
}

/**
 * g_filter_input_stream_get_base_stream:
 * @stream: a #GFilterInputStream.
 * 
 * Gets the base stream for the filter stream.
 *
 * Returns: (transfer none): a #GInputStream.
 **/
GInputStream *
g_filter_input_stream_get_base_stream (GFilterInputStream *stream)
{
  g_return_val_if_fail (G_IS_FILTER_INPUT_STREAM (stream), NULL);

  return stream->base_stream;
}

/**
 * g_filter_input_stream_get_close_base_stream:
 * @stream: a #GFilterInputStream.
 *
 * Returns whether the base stream will be closed when @stream is
 * closed.
 *
 * Returns: %TRUE if the base stream will be closed.
 **/
gboolean
g_filter_input_stream_get_close_base_stream (GFilterInputStream *stream)
{
  GFilterInputStreamPrivate *priv;

  g_return_val_if_fail (G_IS_FILTER_INPUT_STREAM (stream), FALSE);

  priv = g_filter_input_stream_get_instance_private (stream);

  return priv->close_base;
}

/**
 * g_filter_input_stream_set_close_base_stream:
 * @stream: a #GFilterInputStream.
 * @close_base: %TRUE to close the base stream.
 *
 * Sets whether the base stream will be closed when @stream is closed.
 **/
void
g_filter_input_stream_set_close_base_stream (GFilterInputStream *stream,
                                             gboolean            close_base)
{
  GFilterInputStreamPrivate *priv;

  g_return_if_fail (G_IS_FILTER_INPUT_STREAM (stream));

  close_base = !!close_base;
 
  priv = g_filter_input_stream_get_instance_private (stream);

  if (priv->close_base != close_base)
    {
      priv->close_base = close_base;
      g_object_notify (G_OBJECT (stream), "close-base-stream");
    }
}

static gssize
g_filter_input_stream_read (GInputStream  *stream,
                            void          *buffer,
                            gsize          count,
                            GCancellable  *cancellable,
                            GError       **error)
{
  GFilterInputStream *filter_stream;
  GInputStream       *base_stream;
  gssize              nread;

  filter_stream = G_FILTER_INPUT_STREAM (stream);
  base_stream = filter_stream->base_stream;

  nread = g_input_stream_read (base_stream,
                               buffer,
                               count,
                               cancellable,
                               error);

  return nread;
}

static gssize
g_filter_input_stream_skip (GInputStream  *stream,
                            gsize          count,
                            GCancellable  *cancellable,
                            GError       **error)
{
  GFilterInputStream *filter_stream;
  GInputStream       *base_stream;
  gssize              nskipped;

  filter_stream = G_FILTER_INPUT_STREAM (stream);
  base_stream = filter_stream->base_stream;

  nskipped = g_input_stream_skip (base_stream,
                                  count,
                                  cancellable,
                                  error);
  return nskipped;
}

static gboolean
g_filter_input_stream_close (GInputStream  *stream,
                             GCancellable  *cancellable,
                             GError       **error)
{
  GFilterInputStream *filter_stream = G_FILTER_INPUT_STREAM (stream);
  GFilterInputStreamPrivate *priv = g_filter_input_stream_get_instance_private (filter_stream);
  gboolean res = TRUE;

  if (priv->close_base)
    {
      res = g_input_stream_close (filter_stream->base_stream,
                                  cancellable,
                                  error);
    }

  return res;
}