1 /* $OpenBSD: deflate.c,v 1.3 2001/08/20 02:45:22 hugh Exp $ */
2
3 /*-
4 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
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 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 /*
31 * This file contains a wrapper around the deflate algo compression
32 * functions using the zlib library (see net/zlib.{c,h})
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: src/sys/opencrypto/deflate.c,v 1.5 2008/10/23 15:53:51 des Exp $");
37
38 #include <sys/types.h>
39 #include <sys/param.h>
40 #include <sys/malloc.h>
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <net/zlib.h>
44
45 #include <opencrypto/cryptodev.h>
46 #include <opencrypto/deflate.h>
47
48 int window_inflate = -1 * MAX_WBITS;
49 int window_deflate = -12;
50
51 /*
52 * This function takes a block of data and (de)compress it using the deflate
53 * algorithm
54 */
55
56 u_int32_t
57 deflate_global(data, size, decomp, out)
58 u_int8_t *data;
59 u_int32_t size;
60 int decomp;
61 u_int8_t **out;
62 {
63 /* decomp indicates whether we compress (0) or decompress (1) */
64
65 z_stream zbuf;
66 u_int8_t *output;
67 u_int32_t count, result;
68 int error, i = 0, j;
69 struct deflate_buf buf[ZBUF];
70
71 bzero(&zbuf, sizeof(z_stream));
72 for (j = 0; j < ZBUF; j++)
73 buf[j].flag = 0;
74
75 zbuf.next_in = data; /* data that is going to be processed */
76 zbuf.zalloc = z_alloc;
77 zbuf.zfree = z_free;
78 zbuf.opaque = Z_NULL;
79 zbuf.avail_in = size; /* Total length of data to be processed */
80
81 if (!decomp) {
82 buf[i].out = malloc((u_long) size, M_CRYPTO_DATA,
83 M_NOWAIT);
84 if (buf[i].out == NULL)
85 goto bad;
86 buf[i].size = size;
87 buf[i].flag = 1;
88 i++;
89 } else {
90 /*
91 * Choose a buffer with 4x the size of the input buffer
92 * for the size of the output buffer in the case of
93 * decompression. If it's not sufficient, it will need to be
94 * updated while the decompression is going on
95 */
96
97 buf[i].out = malloc((u_long) (size * 4),
98 M_CRYPTO_DATA, M_NOWAIT);
99 if (buf[i].out == NULL)
100 goto bad;
101 buf[i].size = size * 4;
102 buf[i].flag = 1;
103 i++;
104 }
105
106 zbuf.next_out = buf[0].out;
107 zbuf.avail_out = buf[0].size;
108
109 error = decomp ? inflateInit2(&zbuf, window_inflate) :
110 deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
111 window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
112
113 if (error != Z_OK)
114 goto bad;
115 for (;;) {
116 error = decomp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
117 deflate(&zbuf, Z_PARTIAL_FLUSH);
118 if (error != Z_OK && error != Z_STREAM_END)
119 goto bad;
120 else if (zbuf.avail_in == 0 && zbuf.avail_out != 0)
121 goto end;
122 else if (zbuf.avail_out == 0 && i < (ZBUF - 1)) {
123 /* we need more output space, allocate size */
124 buf[i].out = malloc((u_long) size,
125 M_CRYPTO_DATA, M_NOWAIT);
126 if (buf[i].out == NULL)
127 goto bad;
128 zbuf.next_out = buf[i].out;
129 buf[i].size = size;
130 buf[i].flag = 1;
131 zbuf.avail_out = buf[i].size;
132 i++;
133 } else
134 goto bad;
135 }
136
137 end:
138 result = count = zbuf.total_out;
139
140 *out = malloc((u_long) result, M_CRYPTO_DATA, M_NOWAIT);
141 if (*out == NULL)
142 goto bad;
143 if (decomp)
144 inflateEnd(&zbuf);
145 else
146 deflateEnd(&zbuf);
147 output = *out;
148 for (j = 0; buf[j].flag != 0; j++) {
149 if (count > buf[j].size) {
150 bcopy(buf[j].out, *out, buf[j].size);
151 *out += buf[j].size;
152 free(buf[j].out, M_CRYPTO_DATA);
153 count -= buf[j].size;
154 } else {
155 /* it should be the last buffer */
156 bcopy(buf[j].out, *out, count);
157 *out += count;
158 free(buf[j].out, M_CRYPTO_DATA);
159 count = 0;
160 }
161 }
162 *out = output;
163 return result;
164
165 bad:
166 *out = NULL;
167 for (j = 0; buf[j].flag != 0; j++)
168 free(buf[j].out, M_CRYPTO_DATA);
169 if (decomp)
170 inflateEnd(&zbuf);
171 else
172 deflateEnd(&zbuf);
173 return 0;
174 }
175
176 void *
177 z_alloc(nil, type, size)
178 void *nil;
179 u_int type, size;
180 {
181 void *ptr;
182
183 ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
184 return ptr;
185 }
186
187 void
188 z_free(nil, ptr)
189 void *nil, *ptr;
190 {
191 free(ptr, M_CRYPTO_DATA);
192 }
193
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