The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/opencrypto/deflate.c

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    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 1.2.4.1 2005/01/31 23:26:48 imp Exp $");
   37 
   38 #include <sys/types.h>
   39 #include <sys/malloc.h>
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <net/zlib.h>
   43 
   44 #include <opencrypto/cryptodev.h>
   45 #include <opencrypto/deflate.h>
   46 
   47 int window_inflate = -1 * MAX_WBITS;
   48 int window_deflate = -12;
   49 
   50 /*
   51  * This function takes a block of data and (de)compress it using the deflate
   52  * algorithm
   53  */
   54 
   55 u_int32_t
   56 deflate_global(data, size, decomp, out)
   57         u_int8_t *data;
   58         u_int32_t size;
   59         int decomp;
   60         u_int8_t **out;
   61 {
   62         /* decomp indicates whether we compress (0) or decompress (1) */
   63 
   64         z_stream zbuf;
   65         u_int8_t *output;
   66         u_int32_t count, result;
   67         int error, i = 0, j;
   68         struct deflate_buf buf[ZBUF];
   69 
   70         bzero(&zbuf, sizeof(z_stream));
   71         for (j = 0; j < ZBUF; j++)
   72                 buf[j].flag = 0;
   73 
   74         zbuf.next_in = data;    /* data that is going to be processed */
   75         zbuf.zalloc = z_alloc;
   76         zbuf.zfree = z_free;
   77         zbuf.opaque = Z_NULL;
   78         zbuf.avail_in = size;   /* Total length of data to be processed */
   79 
   80         if (!decomp) {
   81                 MALLOC(buf[i].out, u_int8_t *, (u_long) size, M_CRYPTO_DATA, 
   82                     M_NOWAIT);
   83                 if (buf[i].out == NULL)
   84                         goto bad;
   85                 buf[i].size = size;
   86                 buf[i].flag = 1;
   87                 i++;
   88         } else {
   89                 /*
   90                  * Choose a buffer with 4x the size of the input buffer
   91                  * for the size of the output buffer in the case of
   92                  * decompression. If it's not sufficient, it will need to be
   93                  * updated while the decompression is going on
   94                  */
   95 
   96                 MALLOC(buf[i].out, u_int8_t *, (u_long) (size * 4), 
   97                     M_CRYPTO_DATA, M_NOWAIT);
   98                 if (buf[i].out == NULL)
   99                         goto bad;
  100                 buf[i].size = size * 4;
  101                 buf[i].flag = 1;
  102                 i++;
  103         }
  104 
  105         zbuf.next_out = buf[0].out;
  106         zbuf.avail_out = buf[0].size;
  107 
  108         error = decomp ? inflateInit2(&zbuf, window_inflate) :
  109             deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
  110                     window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
  111 
  112         if (error != Z_OK)
  113                 goto bad;
  114         for (;;) {
  115                 error = decomp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
  116                                  deflate(&zbuf, Z_PARTIAL_FLUSH);
  117                 if (error != Z_OK && error != Z_STREAM_END)
  118                         goto bad;
  119                 else if (zbuf.avail_in == 0 && zbuf.avail_out != 0)
  120                         goto end;
  121                 else if (zbuf.avail_out == 0 && i < (ZBUF - 1)) {
  122                         /* we need more output space, allocate size */
  123                         MALLOC(buf[i].out, u_int8_t *, (u_long) size,
  124                             M_CRYPTO_DATA, M_NOWAIT);
  125                         if (buf[i].out == NULL)
  126                                 goto bad;
  127                         zbuf.next_out = buf[i].out;
  128                         buf[i].size = size;
  129                         buf[i].flag = 1;
  130                         zbuf.avail_out = buf[i].size;
  131                         i++;
  132                 } else
  133                         goto bad;
  134         }
  135 
  136 end:
  137         result = count = zbuf.total_out;
  138 
  139         MALLOC(*out, u_int8_t *, (u_long) result, M_CRYPTO_DATA, M_NOWAIT);
  140         if (*out == NULL)
  141                 goto bad;
  142         if (decomp)
  143                 inflateEnd(&zbuf);
  144         else
  145                 deflateEnd(&zbuf);
  146         output = *out;
  147         for (j = 0; buf[j].flag != 0; j++) {
  148                 if (count > buf[j].size) {
  149                         bcopy(buf[j].out, *out, buf[j].size);
  150                         *out += buf[j].size;
  151                         FREE(buf[j].out, M_CRYPTO_DATA);
  152                         count -= buf[j].size;
  153                 } else {
  154                         /* it should be the last buffer */
  155                         bcopy(buf[j].out, *out, count);
  156                         *out += count;
  157                         FREE(buf[j].out, M_CRYPTO_DATA);
  158                         count = 0;
  159                 }
  160         }
  161         *out = output;
  162         return result;
  163 
  164 bad:
  165         *out = NULL;
  166         for (j = 0; buf[j].flag != 0; j++)
  167                 FREE(buf[j].out, M_CRYPTO_DATA);
  168         if (decomp)
  169                 inflateEnd(&zbuf);
  170         else
  171                 deflateEnd(&zbuf);
  172         return 0;
  173 }
  174 
  175 void *
  176 z_alloc(nil, type, size)
  177         void *nil;
  178         u_int type, size;
  179 {
  180         void *ptr;
  181 
  182         ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
  183         return ptr;
  184 }
  185 
  186 void
  187 z_free(nil, ptr)
  188         void *nil, *ptr;
  189 {
  190         free(ptr, M_CRYPTO_DATA);
  191 }

Cache object: 469fb887fba6c3590980d1c2aea64ca0


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