d98e4eb7de
Add a QIOChannel subclass that is capable of performing I/O to/from a memory buffer. This implementation does not attempt to support concurrent readers & writers. It is designed for serialized access where by a single thread at a time may write data, seek and then read data back out. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
61 lines
1.7 KiB
C
61 lines
1.7 KiB
C
/*
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* QEMU I/O channels memory buffer driver
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef QIO_CHANNEL_BUFFER_H__
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#define QIO_CHANNEL_BUFFER_H__
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#include "io/channel.h"
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#define TYPE_QIO_CHANNEL_BUFFER "qio-channel-buffer"
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#define QIO_CHANNEL_BUFFER(obj) \
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OBJECT_CHECK(QIOChannelBuffer, (obj), TYPE_QIO_CHANNEL_BUFFER)
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typedef struct QIOChannelBuffer QIOChannelBuffer;
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/**
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* QIOChannelBuffer:
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*
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* The QIOChannelBuffer object provides a channel implementation
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* that is able to perform I/O to/from a memory buffer.
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*
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*/
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struct QIOChannelBuffer {
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QIOChannel parent;
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size_t capacity; /* Total allocated memory */
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size_t usage; /* Current size of data */
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size_t offset; /* Offset for future I/O ops */
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char *data;
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};
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/**
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* qio_channel_buffer_new:
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* @capacity: the initial buffer capacity to allocate
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*
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* Allocate a new buffer which is initially empty
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*
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* Returns: the new channel object
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*/
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QIOChannelBuffer *
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qio_channel_buffer_new(size_t capacity);
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#endif /* QIO_CHANNEL_BUFFER_H__ */
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