1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are 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 the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <err.h>
32#include <limits.h>
33#include <stddef.h>
34#include <stdint.h>
35
36#include <zstd.h>
37
38#include "mkuzip.h"
39#include "mkuz_blk.h"
40#include "mkuz_zstd.h"
41
42size_t
43mkuz_zstd_cbound(size_t blksz)
44{
45	return (ZSTD_compressBound(blksz));
46}
47
48void *
49mkuz_zstd_init(int *comp_level)
50{
51	ZSTD_CCtx *cctx;
52	size_t rc;
53
54	/* Default chosen for near-parity with mkuzip zlib default. */
55	if (*comp_level == USE_DEFAULT_LEVEL)
56		*comp_level = 9;
57	if (*comp_level < ZSTD_minCLevel() || *comp_level == 0 ||
58	    *comp_level > ZSTD_maxCLevel())
59		errx(1, "provided compression level %d is invalid",
60		    *comp_level);
61
62	cctx = ZSTD_createCCtx();
63	if (cctx == NULL)
64		errx(1, "could not allocate Zstd context");
65
66	rc = ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel,
67	    *comp_level);
68	if (ZSTD_isError(rc))
69		errx(1, "Could not set zstd compression level %d: %s",
70		    *comp_level, ZSTD_getErrorName(rc));
71
72	rc = ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1);
73	if (ZSTD_isError(rc))
74		errx(1, "Could not enable zstd checksum: %s",
75		    ZSTD_getErrorName(rc));
76
77	return (cctx);
78}
79
80void
81mkuz_zstd_compress(void *p, const struct mkuz_blk *iblk, struct mkuz_blk *oblk)
82{
83	ZSTD_CCtx *cctx;
84	size_t rc;
85
86	cctx = p;
87
88	rc = ZSTD_compress2(cctx, oblk->data, oblk->alen, iblk->data,
89	    iblk->info.len);
90	if (ZSTD_isError(rc))
91		errx(1, "could not compress data: ZSTD_compress2: %s",
92		    ZSTD_getErrorName(rc));
93
94	oblk->info.len = rc;
95}
96