1/*-
2 * Copyright (c) 2004 Max Khon
3 * Copyright (c) 2014 Juniper Networks, Inc.
4 * Copyright (c) 2006-2016 Maxim Sobolev <sobomax@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/types.h>
33#include <sys/systm.h>
34#include <sys/malloc.h>
35
36#include <sys/zlib.h>
37
38#include <geom/uzip/g_uzip.h>
39#include <geom/uzip/g_uzip_dapi.h>
40#include <geom/uzip/g_uzip_zlib.h>
41
42struct g_uzip_zlib {
43	uint32_t blksz;
44	struct g_uzip_dapi pub;
45	/* Zlib decoder structs */
46	z_stream zs;
47};
48
49static void *z_alloc(void *, u_int, u_int);
50static void z_free(void *, void *);
51static int g_uzip_zlib_rewind(struct g_uzip_dapi *, const char *);
52
53static void
54g_uzip_zlib_free(struct g_uzip_dapi *zpp)
55{
56	struct g_uzip_zlib *zp;
57
58	zp = (struct g_uzip_zlib *)zpp->pvt;
59	inflateEnd(&zp->zs);
60	free(zp, M_GEOM_UZIP);
61}
62
63static int
64g_uzip_zlib_decompress(struct g_uzip_dapi *zpp, const char *gp_name, void *ibp,
65    size_t ilen, void *obp)
66{
67	int err;
68	struct g_uzip_zlib *zp;
69
70	zp = (struct g_uzip_zlib *)zpp->pvt;
71
72	zp->zs.next_in = ibp;
73	zp->zs.avail_in = ilen;
74	zp->zs.next_out = obp;
75	zp->zs.avail_out = zp->blksz;
76
77	err = (inflate(&zp->zs, Z_FINISH) != Z_STREAM_END) ? 1 : 0;
78	if (err != 0) {
79		printf("%s: UZIP(zlib) inflate() failed\n", gp_name);
80	}
81	return (err);
82}
83
84static int
85g_uzip_zlib_rewind(struct g_uzip_dapi *zpp, const char *gp_name)
86{
87	int err;
88	struct g_uzip_zlib *zp;
89
90	zp = (struct g_uzip_zlib *)zpp->pvt;
91
92	err = 0;
93	if (inflateReset(&zp->zs) != Z_OK) {
94		printf("%s: UZIP(zlib) decoder reset failed\n", gp_name);
95		err = 1;
96	}
97	return (err);
98}
99
100static int
101z_compressBound(int len)
102{
103
104	return (len + (len >> 12) + (len >> 14) + 11);
105}
106
107struct g_uzip_dapi *
108g_uzip_zlib_ctor(uint32_t blksz)
109{
110	struct g_uzip_zlib *zp;
111
112	zp = malloc(sizeof(struct g_uzip_zlib), M_GEOM_UZIP, M_WAITOK);
113	zp->zs.zalloc = z_alloc;
114	zp->zs.zfree = z_free;
115	if (inflateInit(&zp->zs) != Z_OK) {
116		goto e1;
117	}
118	zp->blksz = blksz;
119	zp->pub.max_blen = z_compressBound(blksz);
120	zp->pub.decompress = &g_uzip_zlib_decompress;
121	zp->pub.free = &g_uzip_zlib_free;
122	zp->pub.rewind = &g_uzip_zlib_rewind;
123	zp->pub.pvt = (void *)zp;
124	return (&zp->pub);
125e1:
126	free(zp, M_GEOM_UZIP);
127	return (NULL);
128}
129
130static void *
131z_alloc(void *nil, u_int type, u_int size)
132{
133        void *ptr;
134
135        ptr = malloc(type * size, M_GEOM_UZIP, M_NOWAIT);
136
137        return (ptr);
138}
139
140static void
141z_free(void *nil, void *ptr)
142{
143
144        free(ptr, M_GEOM_UZIP);
145}
146