1/*-
 2 * SPDX-License-Identifier: BSD-2-Clause
 3 *
 4 * Copyright (c) 2014, 2017 Mark Johnston <markj@FreeBSD.org>
 5 *
 6 * Redistribution and use in source and binary forms, with or without
 7 * modification, are permitted provided that the following conditions are
 8 * met:
 9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in
13 *    the documentation and/or other materials provided with the
14 *    distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _SYS__COMPRESSOR_H_
30#define _SYS__COMPRESSOR_H_
31
32#ifdef _KERNEL
33
34/* Supported formats. */
35#define	COMPRESS_GZIP	1
36#define	COMPRESS_ZSTD	2
37
38typedef int (*compressor_cb_t)(void *, size_t, off_t, void *);
39
40struct compressor;
41
42bool		compressor_avail(int format);
43struct compressor *compressor_init(compressor_cb_t cb, int format,
44		    size_t maxiosize, int level, void *arg);
45void		compressor_reset(struct compressor *stream);
46int		compressor_write(struct compressor *stream, void *data,
47		    size_t len);
48int		compressor_flush(struct compressor *stream);
49void		compressor_fini(struct compressor *stream);
50
51#endif /* _KERNEL */
52#endif /* _SYS__COMPRESSOR_H_ */