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
25 #include <sys/types.h>
26 #include <sys/stat.h>
27 #include <fcntl.h>
28 #ifdef HAVE_UNISTD_H
29 #include <unistd.h>
30 #endif
31 #include <errno.h>
32
33 #include <glib.h>
34 #include <glib/gstdio.h>
35 #include "gcancellable.h"
36 #include "gioerror.h"
37 #include "glocalfileinputstream.h"
38 #include "glocalfileinfo.h"
39 #include "glibintl.h"
40
41 #ifdef G_OS_WIN32
42 #include <io.h>
43 #endif
44
45 #include "gioalias.h"
46
47 #define g_local_file_input_stream_get_type _g_local_file_input_stream_get_type
48 G_DEFINE_TYPE (GLocalFileInputStream, g_local_file_input_stream, G_TYPE_FILE_INPUT_STREAM);
49
50 struct _GLocalFileInputStreamPrivate {
51 int fd;
52 };
53
54 static gssize g_local_file_input_stream_read (GInputStream *stream,
55 void *buffer,
56 gsize count,
57 GCancellable *cancellable,
58 GError **error);
59 static gssize g_local_file_input_stream_skip (GInputStream *stream,
60 gsize count,
61 GCancellable *cancellable,
62 GError **error);
63 static gboolean g_local_file_input_stream_close (GInputStream *stream,
64 GCancellable *cancellable,
65 GError **error);
66 static goffset g_local_file_input_stream_tell (GFileInputStream *stream);
67 static gboolean g_local_file_input_stream_can_seek (GFileInputStream *stream);
68 static gboolean g_local_file_input_stream_seek (GFileInputStream *stream,
69 goffset offset,
70 GSeekType type,
71 GCancellable *cancellable,
72 GError **error);
73 static GFileInfo *g_local_file_input_stream_query_info (GFileInputStream *stream,
74 const char *attributes,
75 GCancellable *cancellable,
76 GError **error);
77
78 static void
g_local_file_input_stream_finalize(GObject * object)79 g_local_file_input_stream_finalize (GObject *object)
80 {
81 GLocalFileInputStream *file;
82
83 file = G_LOCAL_FILE_INPUT_STREAM (object);
84
85 G_OBJECT_CLASS (g_local_file_input_stream_parent_class)->finalize (object);
86 }
87
88 static void
g_local_file_input_stream_class_init(GLocalFileInputStreamClass * klass)89 g_local_file_input_stream_class_init (GLocalFileInputStreamClass *klass)
90 {
91 GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
92 GInputStreamClass *stream_class = G_INPUT_STREAM_CLASS (klass);
93 GFileInputStreamClass *file_stream_class = G_FILE_INPUT_STREAM_CLASS (klass);
94
95 g_type_class_add_private (klass, sizeof (GLocalFileInputStreamPrivate));
96
97 gobject_class->finalize = g_local_file_input_stream_finalize;
98
99 stream_class->read_fn = g_local_file_input_stream_read;
100 stream_class->skip = g_local_file_input_stream_skip;
101 stream_class->close_fn = g_local_file_input_stream_close;
102 file_stream_class->tell = g_local_file_input_stream_tell;
103 file_stream_class->can_seek = g_local_file_input_stream_can_seek;
104 file_stream_class->seek = g_local_file_input_stream_seek;
105 file_stream_class->query_info = g_local_file_input_stream_query_info;
106 }
107
108 static void
g_local_file_input_stream_init(GLocalFileInputStream * info)109 g_local_file_input_stream_init (GLocalFileInputStream *info)
110 {
111 info->priv = G_TYPE_INSTANCE_GET_PRIVATE (info,
112 G_TYPE_LOCAL_FILE_INPUT_STREAM,
113 GLocalFileInputStreamPrivate);
114 }
115
116 /**
117 * g_local_file_input_stream_new:
118 * @fd: File Descriptor.
119 *
120 * Returns: #GFileInputStream for the given file descriptor.
121 **/
122 GFileInputStream *
_g_local_file_input_stream_new(int fd)123 _g_local_file_input_stream_new (int fd)
124 {
125 GLocalFileInputStream *stream;
126
127 stream = g_object_new (G_TYPE_LOCAL_FILE_INPUT_STREAM, NULL);
128 stream->priv->fd = fd;
129
130 return G_FILE_INPUT_STREAM (stream);
131 }
132
133 static gssize
g_local_file_input_stream_read(GInputStream * stream,void * buffer,gsize count,GCancellable * cancellable,GError ** error)134 g_local_file_input_stream_read (GInputStream *stream,
135 void *buffer,
136 gsize count,
137 GCancellable *cancellable,
138 GError **error)
139 {
140 GLocalFileInputStream *file;
141 gssize res;
142
143 file = G_LOCAL_FILE_INPUT_STREAM (stream);
144
145 res = -1;
146 while (1)
147 {
148 if (g_cancellable_set_error_if_cancelled (cancellable, error))
149 break;
150 res = read (file->priv->fd, buffer, count);
151 if (res == -1)
152 {
153 int errsv = errno;
154
155 if (errsv == EINTR)
156 continue;
157
158 g_set_error (error, G_IO_ERROR,
159 g_io_error_from_errno (errsv),
160 _("Error reading from file: %s"),
161 g_strerror (errsv));
162 }
163
164 break;
165 }
166
167 return res;
168 }
169
170 static gssize
g_local_file_input_stream_skip(GInputStream * stream,gsize count,GCancellable * cancellable,GError ** error)171 g_local_file_input_stream_skip (GInputStream *stream,
172 gsize count,
173 GCancellable *cancellable,
174 GError **error)
175 {
176 off_t res, start;
177 GLocalFileInputStream *file;
178
179 file = G_LOCAL_FILE_INPUT_STREAM (stream);
180
181 if (g_cancellable_set_error_if_cancelled (cancellable, error))
182 return -1;
183
184 start = lseek (file->priv->fd, 0, SEEK_CUR);
185 if (start == -1)
186 {
187 int errsv = errno;
188
189 g_set_error (error, G_IO_ERROR,
190 g_io_error_from_errno (errsv),
191 _("Error seeking in file: %s"),
192 g_strerror (errsv));
193 return -1;
194 }
195
196 res = lseek (file->priv->fd, count, SEEK_CUR);
197 if (res == -1)
198 {
199 int errsv = errno;
200
201 g_set_error (error, G_IO_ERROR,
202 g_io_error_from_errno (errsv),
203 _("Error seeking in file: %s"),
204 g_strerror (errsv));
205 return -1;
206 }
207
208 return res - start;
209 }
210
211 static gboolean
g_local_file_input_stream_close(GInputStream * stream,GCancellable * cancellable,GError ** error)212 g_local_file_input_stream_close (GInputStream *stream,
213 GCancellable *cancellable,
214 GError **error)
215 {
216 GLocalFileInputStream *file;
217 int res;
218
219 file = G_LOCAL_FILE_INPUT_STREAM (stream);
220
221 if (file->priv->fd == -1)
222 return TRUE;
223
224 while (1)
225 {
226 res = close (file->priv->fd);
227 if (res == -1)
228 {
229 int errsv = errno;
230
231 g_set_error (error, G_IO_ERROR,
232 g_io_error_from_errno (errsv),
233 _("Error closing file: %s"),
234 g_strerror (errsv));
235 }
236 break;
237 }
238
239 return res != -1;
240 }
241
242
243 static goffset
g_local_file_input_stream_tell(GFileInputStream * stream)244 g_local_file_input_stream_tell (GFileInputStream *stream)
245 {
246 GLocalFileInputStream *file;
247 off_t pos;
248
249 file = G_LOCAL_FILE_INPUT_STREAM (stream);
250
251 pos = lseek (file->priv->fd, 0, SEEK_CUR);
252
253 if (pos == (off_t)-1)
254 return 0;
255
256 return pos;
257 }
258
259 static gboolean
g_local_file_input_stream_can_seek(GFileInputStream * stream)260 g_local_file_input_stream_can_seek (GFileInputStream *stream)
261 {
262 GLocalFileInputStream *file;
263 off_t pos;
264
265 file = G_LOCAL_FILE_INPUT_STREAM (stream);
266
267 pos = lseek (file->priv->fd, 0, SEEK_CUR);
268
269 if (pos == (off_t)-1 && errno == ESPIPE)
270 return FALSE;
271
272 return TRUE;
273 }
274
275 static int
seek_type_to_lseek(GSeekType type)276 seek_type_to_lseek (GSeekType type)
277 {
278 switch (type)
279 {
280 default:
281 case G_SEEK_CUR:
282 return SEEK_CUR;
283
284 case G_SEEK_SET:
285 return SEEK_SET;
286
287 case G_SEEK_END:
288 return SEEK_END;
289 }
290 }
291
292 static gboolean
g_local_file_input_stream_seek(GFileInputStream * stream,goffset offset,GSeekType type,GCancellable * cancellable,GError ** error)293 g_local_file_input_stream_seek (GFileInputStream *stream,
294 goffset offset,
295 GSeekType type,
296 GCancellable *cancellable,
297 GError **error)
298 {
299 GLocalFileInputStream *file;
300 off_t pos;
301
302 file = G_LOCAL_FILE_INPUT_STREAM (stream);
303
304 pos = lseek (file->priv->fd, offset, seek_type_to_lseek (type));
305
306 if (pos == (off_t)-1)
307 {
308 int errsv = errno;
309
310 g_set_error (error, G_IO_ERROR,
311 g_io_error_from_errno (errsv),
312 _("Error seeking in file: %s"),
313 g_strerror (errsv));
314 return FALSE;
315 }
316
317 return TRUE;
318 }
319
320 static GFileInfo *
g_local_file_input_stream_query_info(GFileInputStream * stream,const char * attributes,GCancellable * cancellable,GError ** error)321 g_local_file_input_stream_query_info (GFileInputStream *stream,
322 const char *attributes,
323 GCancellable *cancellable,
324 GError **error)
325 {
326 GLocalFileInputStream *file;
327
328 file = G_LOCAL_FILE_INPUT_STREAM (stream);
329
330 if (g_cancellable_set_error_if_cancelled (cancellable, error))
331 return NULL;
332
333 return _g_local_file_info_get_from_fd (file->priv->fd,
334 attributes,
335 error);
336 }
337