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 sys/contrib/zlib)
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <sys/types.h>
39 #include <sys/param.h>
40 #include <sys/malloc.h>
41 #include <sys/param.h>
42 #include <sys/kernel.h>
43 #include <sys/sdt.h>
44 #include <sys/systm.h>
45 #include <contrib/zlib/zlib.h>
46
47 #include <opencrypto/cryptodev.h>
48 #include <opencrypto/deflate.h>
49
50 SDT_PROVIDER_DECLARE(opencrypto);
51 SDT_PROBE_DEFINE2(opencrypto, deflate, deflate_global, entry,
52 "int", "uint32_t");
53 SDT_PROBE_DEFINE6(opencrypto, deflate, deflate_global, bad,
54 "int", "int", "int", "int", "int", "int");
55 SDT_PROBE_DEFINE6(opencrypto, deflate, deflate_global, iter,
56 "int", "int", "int", "int", "int", "int");
57 SDT_PROBE_DEFINE2(opencrypto, deflate, deflate_global, return,
58 "int", "uint32_t");
59
60 int window_inflate = -1 * MAX_WBITS;
61 int window_deflate = -12;
62
63 static void *
64 crypto_zalloc(void *nil, u_int type, u_int size)
65 {
66 void *ptr;
67
68 ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
69 return ptr;
70 }
71
72 static void
73 crypto_zfree(void *nil, void *ptr)
74 {
75
76 free(ptr, M_CRYPTO_DATA);
77 }
78
79 /*
80 * This function takes a block of data and (de)compress it using the deflate
81 * algorithm
82 */
83
84 uint32_t
85 deflate_global(uint8_t *data, uint32_t size, int decomp, uint8_t **out)
86 {
87 /* decomp indicates whether we compress (0) or decompress (1) */
88
89 z_stream zbuf;
90 uint8_t *output;
91 uint32_t count, result;
92 int error, i;
93 struct deflate_buf *bufh, *bufp;
94
95 SDT_PROBE2(opencrypto, deflate, deflate_global, entry, decomp, size);
96
97 bufh = bufp = NULL;
98 if (!decomp) {
99 i = 1;
100 } else {
101 /*
102 * Choose a buffer with 4x the size of the input buffer
103 * for the size of the output buffer in the case of
104 * decompression. If it's not sufficient, it will need to be
105 * updated while the decompression is going on.
106 */
107 i = 4;
108 }
109 /*
110 * Make sure we do have enough output space. Repeated calls to
111 * deflate need at least 6 bytes of output buffer space to avoid
112 * repeated markers. We will always provide at least 16 bytes.
113 */
114 while ((size * i) < 16)
115 i++;
116
117 bufh = bufp = malloc(sizeof(*bufp) + (size_t)(size * i),
118 M_CRYPTO_DATA, M_NOWAIT);
119 if (bufp == NULL) {
120 SDT_PROBE6(opencrypto, deflate, deflate_global, bad,
121 decomp, 0, __LINE__, 0, 0, 0);
122 goto bad2;
123 }
124 bufp->next = NULL;
125 bufp->size = size * i;
126
127 bzero(&zbuf, sizeof(z_stream));
128 zbuf.zalloc = crypto_zalloc;
129 zbuf.zfree = crypto_zfree;
130 zbuf.opaque = Z_NULL;
131 zbuf.next_in = data; /* Data that is going to be processed. */
132 zbuf.avail_in = size; /* Total length of data to be processed. */
133 zbuf.next_out = bufp->data;
134 zbuf.avail_out = bufp->size;
135
136 error = decomp ? inflateInit2(&zbuf, window_inflate) :
137 deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
138 window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
139 if (error != Z_OK) {
140 SDT_PROBE6(opencrypto, deflate, deflate_global, bad,
141 decomp, error, __LINE__, 0, 0, 0);
142 goto bad;
143 }
144
145 for (;;) {
146 error = decomp ? inflate(&zbuf, Z_SYNC_FLUSH) :
147 deflate(&zbuf, Z_FINISH);
148 if (error != Z_OK && error != Z_STREAM_END) {
149 SDT_PROBE6(opencrypto, deflate, deflate_global, bad,
150 decomp, error, __LINE__,
151 zbuf.avail_in, zbuf.avail_out, zbuf.total_out);
152 goto bad;
153 }
154 SDT_PROBE6(opencrypto, deflate, deflate_global, iter,
155 decomp, error, __LINE__,
156 zbuf.avail_in, zbuf.avail_out, zbuf.total_out);
157 if (decomp && zbuf.avail_in == 0 && error == Z_STREAM_END) {
158 /* Done. */
159 break;
160 } else if (!decomp && error == Z_STREAM_END) {
161 /* Done. */
162 break;
163 } else if (zbuf.avail_out == 0) {
164 struct deflate_buf *p;
165
166 /* We need more output space for another iteration. */
167 p = malloc(sizeof(*p) + (size_t)(size * i),
168 M_CRYPTO_DATA, M_NOWAIT);
169 if (p == NULL) {
170 SDT_PROBE6(opencrypto, deflate, deflate_global,
171 bad, decomp, 0, __LINE__, 0, 0, 0);
172 goto bad;
173 }
174 p->next = NULL;
175 p->size = size * i;
176 bufp->next = p;
177 bufp = p;
178 zbuf.next_out = bufp->data;
179 zbuf.avail_out = bufp->size;
180 } else {
181 /* Unexpect result. */
182 SDT_PROBE6(opencrypto, deflate, deflate_global,
183 bad, decomp, error, __LINE__,
184 zbuf.avail_in, zbuf.avail_out, zbuf.total_out);
185 goto bad;
186 }
187 }
188
189 result = count = zbuf.total_out;
190
191 *out = malloc(result, M_CRYPTO_DATA, M_NOWAIT);
192 if (*out == NULL) {
193 SDT_PROBE6(opencrypto, deflate, deflate_global, bad,
194 decomp, 0, __LINE__, 0, 0, 0);
195 goto bad;
196 }
197 if (decomp)
198 inflateEnd(&zbuf);
199 else
200 deflateEnd(&zbuf);
201 output = *out;
202 for (bufp = bufh; bufp != NULL; ) {
203 if (count > bufp->size) {
204 struct deflate_buf *p;
205
206 bcopy(bufp->data, *out, bufp->size);
207 *out += bufp->size;
208 count -= bufp->size;
209 p = bufp;
210 bufp = bufp->next;
211 free(p, M_CRYPTO_DATA);
212 } else {
213 /* It should be the last buffer. */
214 bcopy(bufp->data, *out, count);
215 *out += count;
216 free(bufp, M_CRYPTO_DATA);
217 bufp = NULL;
218 count = 0;
219 }
220 }
221 *out = output;
222 SDT_PROBE2(opencrypto, deflate, deflate_global, return, decomp, result);
223 return result;
224
225 bad:
226 if (decomp)
227 inflateEnd(&zbuf);
228 else
229 deflateEnd(&zbuf);
230 for (bufp = bufh; bufp != NULL; ) {
231 struct deflate_buf *p;
232
233 p = bufp;
234 bufp = bufp->next;
235 free(p, M_CRYPTO_DATA);
236 }
237 bad2:
238 *out = NULL;
239 return 0;
240 }
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