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sysctl(9): Fix a few mandoc related issues
[FreeBSD/FreeBSD.git] / sys / opencrypto / cryptodeflate.c
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 }