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
|
/* 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, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
*/
#include "config.h"
#include "gseekable.h"
#include "glibintl.h"
#include "gioalias.h"
/**
* SECTION:gseekable
* @short_description: Stream seeking interface
* @include: gio/gio.h
* @see_also: #GInputStream, #GOutputStream
*
* #GSeekable is implemented by streams (implementations of
* #GInputStream or #GOutputStream) that support seeking.
*
**/
static void g_seekable_base_init (gpointer g_class);
GType
g_seekable_get_type (void)
{
static volatile gsize g_define_type_id__volatile = 0;
if (g_once_init_enter (&g_define_type_id__volatile))
{
const GTypeInfo seekable_info =
{
sizeof (GSeekableIface), /* class_size */
g_seekable_base_init, /* base_init */
NULL, /* base_finalize */
NULL,
NULL, /* class_finalize */
NULL, /* class_data */
0,
0, /* n_preallocs */
NULL
};
GType g_define_type_id =
g_type_register_static (G_TYPE_INTERFACE, I_("GSeekable"),
&seekable_info, 0);
g_type_interface_add_prerequisite (g_define_type_id, G_TYPE_OBJECT);
g_once_init_leave (&g_define_type_id__volatile, g_define_type_id);
}
return g_define_type_id__volatile;
}
static void
g_seekable_base_init (gpointer g_class)
{
}
/**
* g_seekable_tell:
* @seekable: a #GSeekable.
*
* Tells the current position within the stream.
*
* Returns: the offset from the beginning of the buffer.
**/
goffset
g_seekable_tell (GSeekable *seekable)
{
GSeekableIface *iface;
g_return_val_if_fail (G_IS_SEEKABLE (seekable), 0);
iface = G_SEEKABLE_GET_IFACE (seekable);
return (* iface->tell) (seekable);
}
/**
* g_seekable_can_seek:
* @seekable: a #GSeekable.
*
* Tests if the stream supports the #GSeekableIface.
*
* Returns: %TRUE if @seekable can be seeked. %FALSE otherwise.
**/
gboolean
g_seekable_can_seek (GSeekable *seekable)
{
GSeekableIface *iface;
g_return_val_if_fail (G_IS_SEEKABLE (seekable), FALSE);
iface = G_SEEKABLE_GET_IFACE (seekable);
return (* iface->can_seek) (seekable);
}
/**
* g_seekable_seek:
* @seekable: a #GSeekable.
* @offset: a #goffset.
* @type: a #GSeekType.
* @cancellable: optional #GCancellable object, %NULL to ignore.
* @error: a #GError location to store the error occuring, or %NULL to
* ignore.
*
* Seeks in the stream by the given @offset, modified by @type.
*
* If @cancellable is not %NULL, then the operation can be cancelled by
* triggering the cancellable object from another thread. If the operation
* was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.
*
* Returns: %TRUE if successful. If an error
* has occurred, this function will return %FALSE and set @error
* appropriately if present.
**/
gboolean
g_seekable_seek (GSeekable *seekable,
goffset offset,
GSeekType type,
GCancellable *cancellable,
GError **error)
{
GSeekableIface *iface;
g_return_val_if_fail (G_IS_SEEKABLE (seekable), FALSE);
iface = G_SEEKABLE_GET_IFACE (seekable);
return (* iface->seek) (seekable, offset, type, cancellable, error);
}
/**
* g_seekable_can_truncate:
* @seekable: a #GSeekable.
*
* Tests if the stream can be truncated.
*
* Returns: %TRUE if the stream can be truncated, %FALSE otherwise.
**/
gboolean
g_seekable_can_truncate (GSeekable *seekable)
{
GSeekableIface *iface;
g_return_val_if_fail (G_IS_SEEKABLE (seekable), FALSE);
iface = G_SEEKABLE_GET_IFACE (seekable);
return (* iface->can_truncate) (seekable);
}
/**
* g_seekable_truncate:
* @seekable: a #GSeekable.
* @offset: a #goffset.
* @cancellable: optional #GCancellable object, %NULL to ignore.
* @error: a #GError location to store the error occuring, or %NULL to
* ignore.
*
* Truncates a stream with a given #offset.
*
* If @cancellable is not %NULL, then the operation can be cancelled by
* triggering the cancellable object from another thread. If the operation
* was cancelled, the error %G_IO_ERROR_CANCELLED will be returned. If an
* operation was partially finished when the operation was cancelled the
* partial result will be returned, without an error.
*
* Returns: %TRUE if successful. If an error
* has occurred, this function will return %FALSE and set @error
* appropriately if present.
**/
gboolean
g_seekable_truncate (GSeekable *seekable,
goffset offset,
GCancellable *cancellable,
GError **error)
{
GSeekableIface *iface;
g_return_val_if_fail (G_IS_SEEKABLE (seekable), FALSE);
iface = G_SEEKABLE_GET_IFACE (seekable);
return (* iface->truncate_fn) (seekable, offset, cancellable, error);
}
#define __G_SEEKABLE_C__
#include "gioaliasdef.c"
|
