g_uzip_zlib.c

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    1 /*-
    2  * Copyright (c) 2004 Max Khon
    3  * Copyright (c) 2014 Juniper Networks, Inc.
    4  * Copyright (c) 2006-2016 Maxim Sobolev <sobomax@FreeBSD.org>
    5  * All rights reserved.
    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  * 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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/types.h>
   33 #include <sys/systm.h>
   34 #include <sys/malloc.h>
   35 
   36 #include <contrib/zlib/zlib.h>
   37 #include <dev/zlib/zcalloc.h>
   38 
   39 #include <geom/uzip/g_uzip.h>
   40 #include <geom/uzip/g_uzip_dapi.h>
   41 #include <geom/uzip/g_uzip_zlib.h>
   42 
   43 struct g_uzip_zlib {
   44         uint32_t blksz;
   45         struct g_uzip_dapi pub;
   46         /* Zlib decoder structs */
   47         z_stream zs;
   48 };
   49 
   50 static int g_uzip_zlib_rewind(struct g_uzip_dapi *, const char *);
   51 
   52 static void
   53 g_uzip_zlib_free(struct g_uzip_dapi *zpp)
   54 {
   55         struct g_uzip_zlib *zp;
   56 
   57         zp = (struct g_uzip_zlib *)zpp->pvt;
   58         inflateEnd(&zp->zs);
   59         free(zp, M_GEOM_UZIP);
   60 }
   61 
   62 static int
   63 g_uzip_zlib_decompress(struct g_uzip_dapi *zpp, const char *gp_name, void *ibp,
   64     size_t ilen, void *obp)
   65 {
   66         int err;
   67         struct g_uzip_zlib *zp;
   68 
   69         zp = (struct g_uzip_zlib *)zpp->pvt;
   70 
   71         zp->zs.next_in = ibp;
   72         zp->zs.avail_in = ilen;
   73         zp->zs.next_out = obp;
   74         zp->zs.avail_out = zp->blksz;
   75 
   76         err = (inflate(&zp->zs, Z_FINISH) != Z_STREAM_END) ? 1 : 0;
   77         if (err != 0) {
   78                 printf("%s: UZIP(zlib) inflate() failed\n", gp_name);
   79         }
   80         return (err);
   81 }
   82 
   83 static int
   84 g_uzip_zlib_rewind(struct g_uzip_dapi *zpp, const char *gp_name)
   85 {
   86         int err;
   87         struct g_uzip_zlib *zp;
   88 
   89         zp = (struct g_uzip_zlib *)zpp->pvt;
   90 
   91         err = 0;
   92         if (inflateReset(&zp->zs) != Z_OK) {
   93                 printf("%s: UZIP(zlib) decoder reset failed\n", gp_name);
   94                 err = 1;
   95         }
   96         return (err);
   97 }
   98 
   99 struct g_uzip_dapi *
  100 g_uzip_zlib_ctor(uint32_t blksz)
  101 {
  102         struct g_uzip_zlib *zp;
  103 
  104         zp = malloc(sizeof(struct g_uzip_zlib), M_GEOM_UZIP, M_WAITOK | M_ZERO);
  105         if (inflateInit(&zp->zs) != Z_OK) {
  106                 goto e1;
  107         }
  108         zp->blksz = blksz;
  109         zp->pub.max_blen = compressBound(blksz);
  110         zp->pub.decompress = &g_uzip_zlib_decompress;
  111         zp->pub.free = &g_uzip_zlib_free;
  112         zp->pub.rewind = &g_uzip_zlib_rewind;
  113         zp->pub.pvt = (void *)zp;
  114         return (&zp->pub);
  115 e1:
  116         free(zp, M_GEOM_UZIP);
  117         return (NULL);
  118 }

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FreeBSD/Linux Kernel Cross Reference sys/geom/uzip/g_uzip_zlib.c

FreeBSD/Linux Kernel Cross Reference
sys/geom/uzip/g_uzip_zlib.c