1104349Sphk/*
2104349Sphk * Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org>
3104349Sphk * All rights reserved.
4104349Sphk *
5104349Sphk * Redistribution and use in source and binary forms, with or without
6104349Sphk * modification, are permitted provided that the following conditions
7104349Sphk * are met:
8104349Sphk * 1. Redistributions of source code must retain the above copyright
9104349Sphk *    notice, this list of conditions and the following disclaimer.
10104349Sphk * 2. Redistributions in binary form must reproduce the above copyright
11104349Sphk *    notice, this list of conditions and the following disclaimer in the
12104349Sphk *    documentation and/or other materials provided with the distribution.
13104349Sphk *
14104349Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15104349Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16104349Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17104349Sphk * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18104349Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19104349Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20104349Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21104349Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22104349Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23104349Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24104349Sphk * SUCH DAMAGE.
25104349Sphk */
26104349Sphk
27104349Sphk#include <sys/param.h>
28104349Sphk#include <err.h>
29104349Sphk#include <stdint.h>
30104349Sphk
31104349Sphk#include <zlib.h>
32104349Sphk
33104349Sphk#include "mkuzip.h"
34104349Sphk#include "mkuz_blk.h"
35104349Sphk#include "mkuz_zlib.h"
36104349Sphk
37104349Sphkstruct 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