deflate.c

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    1 /*      $NetBSD: deflate.c,v 1.2 2003/08/27 00:12:37 thorpej Exp $ */
    2 /*      $FreeBSD: src/sys/opencrypto/deflate.c,v 1.1.2.1 2002/11/21 23:34:23 sam Exp $  */
    3 /* $OpenBSD: deflate.c,v 1.3 2001/08/20 02:45:22 hugh Exp $ */
    4 
    5 /*
    6  * Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  *
   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.
   19  *
   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.
   30  */
   31 
   32 /*
   33  * This file contains a wrapper around the deflate algo compression
   34  * functions using the zlib library (see net/zlib.{c,h})
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __KERNEL_RCSID(0, "$NetBSD: deflate.c,v 1.2 2003/08/27 00:12:37 thorpej Exp $");
   39 
   40 #include <sys/types.h>
   41 #include <sys/malloc.h>
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <net/zlib.h>
   45 
   46 #include <opencrypto/cryptodev.h>
   47 #include <opencrypto/deflate.h>
   48 
   49 int window_inflate = -1 * MAX_WBITS;
   50 int window_deflate = -12;
   51 
   52 /*
   53  * This function takes a block of data and (de)compress it using the deflate
   54  * algorithm
   55  */
   56 
   57 static void *
   58 ocf_zalloc(void *nil, u_int type, u_int size)
   59 {
   60         void *ptr;
   61 
   62         ptr = malloc(type *size, M_CRYPTO_DATA, M_NOWAIT);
   63         return ptr;
   64 }
   65 
   66 static void
   67 ocf_zfree(void *nil, void *ptr)
   68 {
   69         free(ptr, M_CRYPTO_DATA);
   70 }
   71 
   72 u_int32_t
   73 deflate_global(data, size, decomp, out)
   74         u_int8_t *data;
   75         u_int32_t size;
   76         int decomp;
   77         u_int8_t **out;
   78 {
   79         /* decomp indicates whether we compress (0) or decompress (1) */
   80 
   81         z_stream zbuf;
   82         u_int8_t *output;
   83         u_int32_t count, result;
   84         int error, i = 0, j;
   85         struct deflate_buf buf[ZBUF];
   86 
   87         bzero(&zbuf, sizeof(z_stream));
   88         for (j = 0; j < ZBUF; j++)
   89                 buf[j].flag = 0;
   90 
   91         zbuf.next_in = data;    /* data that is going to be processed */
   92         zbuf.zalloc = ocf_zalloc;
   93         zbuf.zfree = ocf_zfree;
   94         zbuf.opaque = Z_NULL;
   95         zbuf.avail_in = size;   /* Total length of data to be processed */
   96 
   97         if (!decomp) {
   98                 MALLOC(buf[i].out, u_int8_t *, (u_long) size, M_CRYPTO_DATA, 
   99                     M_NOWAIT);
  100                 if (buf[i].out == NULL)
  101                         goto bad;
  102                 buf[i].size = size;
  103                 buf[i].flag = 1;
  104                 i++;
  105         } else {
  106                 /*
  107                  * Choose a buffer with 4x the size of the input buffer
  108                  * for the size of the output buffer in the case of
  109                  * decompression. If it's not sufficient, it will need to be
  110                  * updated while the decompression is going on
  111                  */
  112 
  113                 MALLOC(buf[i].out, u_int8_t *, (u_long) (size * 4), 
  114                     M_CRYPTO_DATA, M_NOWAIT);
  115                 if (buf[i].out == NULL)
  116                         goto bad;
  117                 buf[i].size = size * 4;
  118                 buf[i].flag = 1;
  119                 i++;
  120         }
  121 
  122         zbuf.next_out = buf[0].out;
  123         zbuf.avail_out = buf[0].size;
  124 
  125         error = decomp ? inflateInit2(&zbuf, window_inflate) :
  126             deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
  127                     window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
  128 
  129         if (error != Z_OK)
  130                 goto bad;
  131         for (;;) {
  132                 error = decomp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
  133                                  deflate(&zbuf, Z_PARTIAL_FLUSH);
  134                 if (error != Z_OK && error != Z_STREAM_END)
  135                         goto bad;
  136                 else if (zbuf.avail_in == 0 && zbuf.avail_out != 0)
  137                         goto end;
  138                 else if (zbuf.avail_out == 0 && i < (ZBUF - 1)) {
  139                         /* we need more output space, allocate size */
  140                         MALLOC(buf[i].out, u_int8_t *, (u_long) size,
  141                             M_CRYPTO_DATA, M_NOWAIT);
  142                         if (buf[i].out == NULL)
  143                                 goto bad;
  144                         zbuf.next_out = buf[i].out;
  145                         buf[i].size = size;
  146                         buf[i].flag = 1;
  147                         zbuf.avail_out = buf[i].size;
  148                         i++;
  149                 } else
  150                         goto bad;
  151         }
  152 
  153 end:
  154         result = count = zbuf.total_out;
  155 
  156         MALLOC(*out, u_int8_t *, (u_long) result, M_CRYPTO_DATA, M_NOWAIT);
  157         if (*out == NULL)
  158                 goto bad;
  159         if (decomp)
  160                 inflateEnd(&zbuf);
  161         else
  162                 deflateEnd(&zbuf);
  163         output = *out;
  164         for (j = 0; buf[j].flag != 0; j++) {
  165                 if (count > buf[j].size) {
  166                         bcopy(buf[j].out, *out, buf[j].size);
  167                         *out += buf[j].size;
  168                         FREE(buf[j].out, M_CRYPTO_DATA);
  169                         count -= buf[j].size;
  170                 } else {
  171                         /* it should be the last buffer */
  172                         bcopy(buf[j].out, *out, count);
  173                         *out += count;
  174                         FREE(buf[j].out, M_CRYPTO_DATA);
  175                         count = 0;
  176                 }
  177         }
  178         *out = output;
  179         return result;
  180 
  181 bad:
  182         *out = NULL;
  183         for (j = 0; buf[j].flag != 0; j++)
  184                 FREE(buf[j].out, M_CRYPTO_DATA);
  185         if (decomp)
  186                 inflateEnd(&zbuf);
  187         else
  188                 deflateEnd(&zbuf);
  189         return 0;
  190 }

Cache object: 3363e0c90b148dce6a3afa523ff13d2f

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

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