1/*
2 * Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/param.h>
28#include <err.h>
29#include <stdint.h>
30
31#include <zlib.h>
32
33#include "mkuzip.h"
34#include "mkuz_blk.h"
35#include "mkuz_zlib.h"
36
37struct mkuz_zlib {
38	int comp_level;
39};
40
41size_t
42mkuz_zlib_cbound(size_t blksz)
43{
44	return (compressBound(blksz));
45}
46
47void *
48mkuz_zlib_init(int *comp_level)
49{
50	struct mkuz_zlib *zp;
51
52	if (*comp_level == USE_DEFAULT_LEVEL)
53		*comp_level = Z_BEST_COMPRESSION;
54	if (*comp_level < Z_BEST_SPEED || *comp_level > Z_BEST_COMPRESSION)
55		errx(1, "provided compression level %d is invalid",
56		    *comp_level);
57		/* Not reached */
58
59	zp = mkuz_safe_zmalloc(sizeof(struct mkuz_zlib));
60	zp->comp_level = *comp_level;
61
62	return (zp);
63}
64
65void
66mkuz_zlib_compress(void *p, const struct mkuz_blk *iblk, struct mkuz_blk *oblk)
67{
68	uLongf destlen_z;
69	struct mkuz_zlib *zp;
70
71	zp = (struct mkuz_zlib *)p;
72
73	destlen_z = oblk->alen;
74	if (compress2(oblk->data, &destlen_z, iblk->data, iblk->info.len,
75	    zp->comp_level) != Z_OK) {
76		errx(1, "can't compress data: compress2() failed");
77		/* Not reached */
78	}
79
80	oblk->info.len = (uint32_t)destlen_z;
81}
82