61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
|
/*
|
||
|
|
* QEMU I/O channels memory buffer driver
|
||
|
|
*
|
||
|
|
* Copyright (c) 2015 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, see <http://www.gnu.org/licenses/>.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef QIO_CHANNEL_BUFFER_H__
|
||
|
|
#define QIO_CHANNEL_BUFFER_H__
|
||
|
|
|
||
|
|
#include "io/channel.h"
|
||
|
|
|
||
|
|
#define TYPE_QIO_CHANNEL_BUFFER "qio-channel-buffer"
|
||
|
|
#define QIO_CHANNEL_BUFFER(obj) \
|
||
|
|
OBJECT_CHECK(QIOChannelBuffer, (obj), TYPE_QIO_CHANNEL_BUFFER)
|
||
|
|
|
||
|
|
typedef struct QIOChannelBuffer QIOChannelBuffer;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* QIOChannelBuffer:
|
||
|
|
*
|
||
|
|
* The QIOChannelBuffer object provides a channel implementation
|
||
|
|
* that is able to perform I/O to/from a memory buffer.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct QIOChannelBuffer {
|
||
|
|
QIOChannel parent;
|
||
|
|
size_t capacity; /* Total allocated memory */
|
||
|
|
size_t usage; /* Current size of data */
|
||
|
|
size_t offset; /* Offset for future I/O ops */
|
||
|
|
char *data;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* qio_channel_buffer_new:
|
||
|
|
* @capacity: the initial buffer capacity to allocate
|
||
|
|
*
|
||
|
|
* Allocate a new buffer which is initially empty
|
||
|
|
*
|
||
|
|
* Returns: the new channel object
|
||
|
|
*/
|
||
|
|
QIOChannelBuffer *
|
||
|
|
qio_channel_buffer_new(size_t capacity);
|
||
|
|
|
||
|
|
#endif /* QIO_CHANNEL_BUFFER_H__ */
|