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 /*      $NetBSD: deflate.c,v 1.7.2.2 2007/09/25 00:49:39 xtraeme 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 1.7.2.2 2007/09/25 00:49:39 xtraeme 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, *tmp;
   86         size_t len, old_len;
   87 
   88         len = ZBUF;
   89         buf = malloc(len*sizeof(struct deflate_buf), M_CRYPTO_DATA, M_NOWAIT);
   90         if (buf == NULL)
   91                 return 0;
   92 
   93         memset(&zbuf, 0, sizeof(z_stream));
   94         for (j = 0; j < len; j++)
   95                 buf[j].flag = 0;
   96 
   97         zbuf.next_in = data;    /* data that is going to be processed */
   98         zbuf.zalloc = ocf_zalloc;
   99         zbuf.zfree = ocf_zfree;
  100         zbuf.opaque = Z_NULL;
  101         zbuf.avail_in = size;   /* Total length of data to be processed */
  102 
  103         if (!decomp) {
  104                 buf[i].out = malloc(size, M_CRYPTO_DATA, M_NOWAIT);
  105                 if (buf[i].out == NULL)
  106                         goto bad;
  107                 buf[i].size = size;
  108                 buf[i].flag = 1;
  109                 i++;
  110         } else {
  111                 /*
  112                  * Choose a buffer with 4x the size of the input buffer
  113                  * for the size of the output buffer in the case of
  114                  * decompression. If it's not sufficient, it will need to be
  115                  * updated while the decompression is going on
  116                  */
  117 
  118                 buf[i].size = size * 4;
  119                 buf[i].out = malloc(buf[i].size, M_CRYPTO_DATA, M_NOWAIT);
  120                 if (buf[i].out == NULL)
  121                         goto bad;
  122                 buf[i].flag = 1;
  123                 i++;
  124         }
  125 
  126         zbuf.next_out = buf[0].out;
  127         zbuf.avail_out = buf[0].size;
  128 
  129         error = decomp ? inflateInit2(&zbuf, window_inflate) :
  130             deflateInit2(&zbuf, Z_DEFAULT_COMPRESSION, Z_METHOD,
  131                     window_deflate, Z_MEMLEVEL, Z_DEFAULT_STRATEGY);
  132 
  133         if (error != Z_OK)
  134                 goto bad;
  135         for (;;) {
  136                 error = decomp ? inflate(&zbuf, Z_PARTIAL_FLUSH) :
  137                                  deflate(&zbuf, Z_PARTIAL_FLUSH);
  138                 if (error != Z_OK && error != Z_STREAM_END)
  139                         goto bad;
  140                 else if (zbuf.avail_in == 0 && zbuf.avail_out != 0)
  141                         goto end;
  142                 else if (zbuf.avail_out == 0) {
  143                         if (i == (len-1)) {
  144                                 old_len = i;
  145                                 len += ZBUF;
  146                                 tmp = realloc(buf,len*sizeof(struct deflate_buf),
  147                                                           M_CRYPTO_DATA, M_NOWAIT);
  148                                 if (tmp == NULL)
  149                                         goto bad;
  150                                 buf = tmp;
  151                                 for (j = old_len; j < len; j++)
  152                                         buf[j].flag = 0;
  153                         }
  154                         /* we need more output space, allocate size */
  155                         buf[i].out = malloc(size, M_CRYPTO_DATA, M_NOWAIT);
  156                         if (buf[i].out == NULL)
  157                                 goto bad;
  158                         zbuf.next_out = buf[i].out;
  159                         buf[i].size = size;
  160                         buf[i].flag = 1;
  161                         zbuf.avail_out = buf[i].size;
  162                         i++;
  163                 } else
  164                         goto bad;
  165         }
  166 
  167 end:
  168         result = count = zbuf.total_out;
  169 
  170         *out = malloc(result, M_CRYPTO_DATA, M_NOWAIT);
  171         if (*out == NULL)
  172                 goto bad;
  173         if (decomp)
  174                 inflateEnd(&zbuf);
  175         else
  176                 deflateEnd(&zbuf);
  177         output = *out;
  178         for (j = 0; buf[j].flag != 0; j++) {
  179                 if (count > buf[j].size) {
  180                         memcpy(*out, buf[j].out, buf[j].size);
  181                         *out += buf[j].size;
  182                         free(buf[j].out, M_CRYPTO_DATA);
  183                         count -= buf[j].size;
  184                 } else {
  185                         /* it should be the last buffer */
  186                         memcpy(*out, buf[j].out, count);
  187                         *out += count;
  188                         free(buf[j].out, M_CRYPTO_DATA);
  189                         count = 0;
  190                 }
  191         }
  192         free(buf, M_CRYPTO_DATA);
  193         *out = output;
  194         return result;
  195 
  196 bad:
  197         *out = NULL;
  198         for (j = 0; buf[j].flag != 0; j++)
  199                 free(buf[j].out, M_CRYPTO_DATA);
  200         free(buf, M_CRYPTO_DATA);
  201         if (decomp)
  202                 inflateEnd(&zbuf);
  203         else
  204                 deflateEnd(&zbuf);
  205         return 0;
  206 }

Cache object: 09eaf19bfa55054647bdddb1338540b2


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