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
37 struct mkuz_zlib {
38 int comp_level;
39 };
40
41 size_t
mkuz_zlib_cbound(size_t blksz)42 mkuz_zlib_cbound(size_t blksz)
43 {
44 return (compressBound(blksz));
45 }
46
47 void *
mkuz_zlib_init(int * comp_level)48 mkuz_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
65 void
mkuz_zlib_compress(void * p,const struct mkuz_blk * iblk,struct mkuz_blk * oblk)66 mkuz_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