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 #include "qom/object.h" 26 27 #define TYPE_QIO_CHANNEL_BUFFER "qio-channel-buffer" 28 typedef struct QIOChannelBuffer QIOChannelBuffer; 29 DECLARE_INSTANCE_CHECKER(QIOChannelBuffer, QIO_CHANNEL_BUFFER, 30 TYPE_QIO_CHANNEL_BUFFER) 31 32 33 /** 34 * QIOChannelBuffer: 35 * 36 * The QIOChannelBuffer object provides a channel implementation 37 * that is able to perform I/O to/from a memory buffer. 38 * 39 */ 40 41 struct QIOChannelBuffer { 42 QIOChannel parent; 43 size_t capacity; /* Total allocated memory */ 44 size_t usage; /* Current size of data */ 45 size_t offset; /* Offset for future I/O ops */ 46 uint8_t *data; 47 }; 48 49 50 /** 51 * qio_channel_buffer_new: 52 * @capacity: the initial buffer capacity to allocate 53 * 54 * Allocate a new buffer which is initially empty 55 * 56 * Returns: the new channel object 57 */ 58 QIOChannelBuffer * 59 qio_channel_buffer_new(size_t capacity); 60 61 #endif /* QIO_CHANNEL_BUFFER_H */ 62