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/cdefs.h>
28 #include <sys/param.h>
29 #include <err.h>
30 #include <stdint.h>
31
32 #include <zlib.h>
33
34 #include "mkuzip.h"
35 #include "mkuz_blk.h"
36 #include "mkuz_zlib.h"
37
38 struct mkuz_zlib {
39 int comp_level;
40 };
41
42 size_t
mkuz_zlib_cbound(size_t blksz)43 mkuz_zlib_cbound(size_t blksz)
44 {
45 return (compressBound(blksz));
46 }
47
48 void *
mkuz_zlib_init(int * comp_level)49 mkuz_zlib_init(int *comp_level)
50 {
51 struct mkuz_zlib *zp;
52
53 if (*comp_level == USE_DEFAULT_LEVEL)
54 *comp_level = Z_BEST_COMPRESSION;
55 if (*comp_level < Z_BEST_SPEED || *comp_level > Z_BEST_COMPRESSION)
56 errx(1, "provided compression level %d is invalid",
57 *comp_level);
58 /* Not reached */
59
60 zp = mkuz_safe_zmalloc(sizeof(struct mkuz_zlib));
61 zp->comp_level = *comp_level;
62
63 return (zp);
64 }
65
66 void
mkuz_zlib_compress(void * p,const struct mkuz_blk * iblk,struct mkuz_blk * oblk)67 mkuz_zlib_compress(void *p, const struct mkuz_blk *iblk, struct mkuz_blk *oblk)
68 {
69 uLongf destlen_z;
70 struct mkuz_zlib *zp;
71
72 zp = (struct mkuz_zlib *)p;
73
74 destlen_z = oblk->alen;
75 if (compress2(oblk->data, &destlen_z, iblk->data, iblk->info.len,
76 zp->comp_level) != Z_OK) {
77 errx(1, "can't compress data: compress2() failed");
78 /* Not reached */
79 }
80
81 oblk->info.len = (uint32_t)destlen_z;
82 }
83