1 | /* |
2 | * QEMU I/O channels memory buffer driver |
3 | * |
4 | * Copyright (c) 2015 Red Hat, Inc. |
5 | * |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2 of the License, or (at your option) any later version. |
10 | * |
11 | * This library is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
18 | * |
19 | */ |
20 | |
21 | #ifndef QIO_CHANNEL_BUFFER_H |
22 | #define QIO_CHANNEL_BUFFER_H |
23 | |
24 | #include "io/channel.h" |
25 | |
26 | #define TYPE_QIO_CHANNEL_BUFFER "qio-channel-buffer" |
27 | #define QIO_CHANNEL_BUFFER(obj) \ |
28 | OBJECT_CHECK(QIOChannelBuffer, (obj), TYPE_QIO_CHANNEL_BUFFER) |
29 | |
30 | typedef struct QIOChannelBuffer QIOChannelBuffer; |
31 | |
32 | /** |
33 | * QIOChannelBuffer: |
34 | * |
35 | * The QIOChannelBuffer object provides a channel implementation |
36 | * that is able to perform I/O to/from a memory buffer. |
37 | * |
38 | */ |
39 | |
40 | struct QIOChannelBuffer { |
41 | QIOChannel parent; |
42 | size_t capacity; /* Total allocated memory */ |
43 | size_t usage; /* Current size of data */ |
44 | size_t offset; /* Offset for future I/O ops */ |
45 | uint8_t *data; |
46 | }; |
47 | |
48 | |
49 | /** |
50 | * qio_channel_buffer_new: |
51 | * @capacity: the initial buffer capacity to allocate |
52 | * |
53 | * Allocate a new buffer which is initially empty |
54 | * |
55 | * Returns: the new channel object |
56 | */ |
57 | QIOChannelBuffer * |
58 | qio_channel_buffer_new(size_t capacity); |
59 | |
60 | #endif /* QIO_CHANNEL_BUFFER_H */ |
61 | |