1 /* $FreeBSD: src/sys/opencrypto/deflate.c,v 1.1.2.1 2002/11/21 23:34:23 sam Exp $ */
2 /* $DragonFly: src/sys/opencrypto/deflate.c,v 1.2 2003/06/17 04:28:54 dillon Exp $ */
3 /* $OpenBSD: deflate.c,v 1.3 2001/08/20 02:45:22 hugh Exp $ */
6 * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * This file contains a wrapper around the deflate algo compression
34 * functions using the zlib library (see net/zlib.{c,h})
37 #include <sys/types.h>
38 #include <sys/malloc.h>
39 #include <sys/param.h>
40 #include <sys/systm.h>
43 #include <opencrypto/cryptodev.h>
44 #include <opencrypto/deflate.h>
46 int window_inflate = -1 * MAX_WBITS;
47 int window_deflate = -12;
50 * This function takes a block of data and (de)compress it using the deflate
55 deflate_global(data, size, decomp, out)
61 /* decomp indicates whether we compress (0) or decompress (1) */
65 u_int32_t count, result;
67 struct deflate_buf buf[ZBUF];
69 bzero(&zbuf, sizeof(z_stream));
70 for (j = 0; j < ZBUF; j++)
73 zbuf.next_in = data; /* data that is going to be processed */
74 zbuf.zalloc = z_alloc;
77 zbuf.avail_in = size; /* Total length of data to be processed */
80 MALLOC(buf[i].out, u_int8_t *, (u_long) size, M_CRYPTO_DATA,
82 if (buf[i].out == NULL)
89 * Choose a buffer with 4x the size of the input buffer
90 * for the size of the output buffer in the case of
91 * decompression. If it's not sufficient, it will need to be
92 * updated while the decompression is going on
95 MALLOC(buf[i].out, u_int8_t *, (u_long) (size * 4),
96 M_CRYPTO_DATA, M_NOWAIT);
97 if (buf[i].out == NULL)
99 buf[i].size = size * 4;
104 zbuf.next_out = buf[0].out;
105 zbuf.avail_out = buf[0].size;
107 error = decomp ? inflateInit2(&zbuf, window_inflate) :
108 deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
109 window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
114 error = decomp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
115 deflate(&zbuf, Z_PARTIAL_FLUSH);
116 if (error != Z_OK && error != Z_STREAM_END)
118 else if (zbuf.avail_in == 0 && zbuf.avail_out != 0)
120 else if (zbuf.avail_out == 0 && i < (ZBUF - 1)) {
121 /* we need more output space, allocate size */
122 MALLOC(buf[i].out, u_int8_t *, (u_long) size,
123 M_CRYPTO_DATA, M_NOWAIT);
124 if (buf[i].out == NULL)
126 zbuf.next_out = buf[i].out;
129 zbuf.avail_out = buf[i].size;
136 result = count = zbuf.total_out;
138 MALLOC(*out, u_int8_t *, (u_long) result, M_CRYPTO_DATA, M_NOWAIT);
146 for (j = 0; buf[j].flag != 0; j++) {
147 if (count > buf[j].size) {
148 bcopy(buf[j].out, *out, buf[j].size);
150 FREE(buf[j].out, M_CRYPTO_DATA);
151 count -= buf[j].size;
153 /* it should be the last buffer */
154 bcopy(buf[j].out, *out, count);
156 FREE(buf[j].out, M_CRYPTO_DATA);
165 for (j = 0; buf[j].flag != 0; j++)
166 FREE(buf[j].out, M_CRYPTO_DATA);
175 z_alloc(nil, type, size)
181 ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
189 free(ptr, M_CRYPTO_DATA);