1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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#include <err.h>
30#include <limits.h>
31#include <stddef.h>
32#include <stdint.h>
33
34#include <zstd.h>
35
36#include "mkuzip.h"
37#include "mkuz_blk.h"
38#include "mkuz_zstd.h"
39
40size_t
41mkuz_zstd_cbound(size_t blksz)
42{
43	return (ZSTD_compressBound(blksz));
44}
45
46void *
47mkuz_zstd_init(int *comp_level)
48{
49	ZSTD_CCtx *cctx;
50	size_t rc;
51
52	/* Default chosen for near-parity with mkuzip zlib default. */
53	if (*comp_level == USE_DEFAULT_LEVEL)
54		*comp_level = 9;
55	if (*comp_level < ZSTD_minCLevel() || *comp_level == 0 ||
56	    *comp_level > ZSTD_maxCLevel())
57		errx(1, "provided compression level %d is invalid",
58		    *comp_level);
59
60	cctx = ZSTD_createCCtx();
61	if (cctx == NULL)
62		errx(1, "could not allocate Zstd context");
63
64	rc = ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel,
65	    *comp_level);
66	if (ZSTD_isError(rc))
67		errx(1, "Could not set zstd compression level %d: %s",
68		    *comp_level, ZSTD_getErrorName(rc));
69
70	rc = ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1);
71	if (ZSTD_isError(rc))
72		errx(1, "Could not enable zstd checksum: %s",
73		    ZSTD_getErrorName(rc));
74
75	return (cctx);
76}
77
78void
79mkuz_zstd_compress(void *p, const struct mkuz_blk *iblk, struct mkuz_blk *oblk)
80{
81	ZSTD_CCtx *cctx;
82	size_t rc;
83
84	cctx = p;
85
86	rc = ZSTD_compress2(cctx, oblk->data, oblk->alen, iblk->data,
87	    iblk->info.len);
88	if (ZSTD_isError(rc))
89		errx(1, "could not compress data: ZSTD_compress2: %s",
90		    ZSTD_getErrorName(rc));
91
92	oblk->info.len = rc;
93}
94