sys/opencrypto/deflate.c

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