| 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 2.1 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 | #include "qom/object.h" |
| 26 | |
| 27 | #define TYPE_QIO_CHANNEL_BUFFER "qio-channel-buffer" |
| 28 | OBJECT_DECLARE_SIMPLE_TYPE(QIOChannelBuffer, QIO_CHANNEL_BUFFER) |
| 29 | |
| 30 | |
| 31 | /** |
| 32 | * QIOChannelBuffer: |
| 33 | * |
| 34 | * The QIOChannelBuffer object provides a channel implementation |
| 35 | * that is able to perform I/O to/from a memory buffer. |
| 36 | * |
| 37 | */ |
| 38 | |
| 39 | struct QIOChannelBuffer { |
| 40 | QIOChannel parent; |
| 41 | size_t capacity; /* Total allocated memory */ |
| 42 | size_t usage; /* Current size of data */ |
| 43 | size_t offset; /* Offset for future I/O ops */ |
| 44 | uint8_t *data; |
| 45 | }; |
| 46 | |
| 47 | |
| 48 | /** |
| 49 | * qio_channel_buffer_new: |
| 50 | * @capacity: the initial buffer capacity to allocate |
| 51 | * |
| 52 | * Allocate a new buffer which is initially empty |
| 53 | * |
| 54 | * Returns: the new channel object |
| 55 | */ |
| 56 | QIOChannelBuffer * |
| 57 | qio_channel_buffer_new(size_t capacity); |
| 58 | |
| 59 | #endif /* QIO_CHANNEL_BUFFER_H */ |