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