zmod.c

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    1 /*
    2  * CDDL HEADER START
    3  *
    4  * The contents of this file are subject to the terms of the
    5  * Common Development and Distribution License (the "License").
    6  * You may not use this file except in compliance with the License.
    7  *
    8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
    9  * or http://www.opensolaris.org/os/licensing.
   10  * See the License for the specific language governing permissions
   11  * and limitations under the License.
   12  *
   13  * When distributing Covered Code, include this CDDL HEADER in each
   14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
   15  * If applicable, add the following below this CDDL HEADER, with the
   16  * fields enclosed by brackets "[]" replaced with your own identifying
   17  * information: Portions Copyright [yyyy] [name of copyright owner]
   18  *
   19  * CDDL HEADER END
   20  */
   21 
   22 /*
   23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   24  * Use is subject to license terms.
   25  */
   26 
   27 #include <sys/types.h>
   28 #include <sys/cmn_err.h>
   29 #include <sys/systm.h>
   30 #include <sys/kmem.h>
   31 #include <sys/zmod.h>
   32 
   33 #include <contrib/zlib/zlib.h>
   34 #include <contrib/zlib/zutil.h>
   35 
   36 /*ARGSUSED*/
   37 static void *
   38 zfs_zcalloc(void *opaque, uint_t items, uint_t size)
   39 {
   40         void *ptr;
   41 
   42         ptr = malloc((size_t)items * size, M_SOLARIS, M_NOWAIT);
   43         return ptr;
   44 }
   45 
   46 /*ARGSUSED*/
   47 static void
   48 zfs_zcfree(void *opaque, void *ptr)
   49 {
   50 
   51         free(ptr, M_SOLARIS);
   52 }
   53 
   54 /*
   55  * Uncompress the buffer 'src' into the buffer 'dst'.  The caller must store
   56  * the expected decompressed data size externally so it can be passed in.
   57  * The resulting decompressed size is then returned through dstlen.  This
   58  * function return Z_OK on success, or another error code on failure.
   59  */
   60 int
   61 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
   62 {
   63         z_stream zs;
   64         int err;
   65 
   66         bzero(&zs, sizeof (zs));
   67         zs.next_in = (uchar_t *)src;
   68         zs.avail_in = srclen;
   69         zs.next_out = dst;
   70         zs.avail_out = *dstlen;
   71         zs.zalloc = zfs_zcalloc;
   72         zs.zfree = zfs_zcfree;
   73 
   74         /*
   75          * Call inflateInit2() specifying a window size of DEF_WBITS
   76          * with the 6th bit set to indicate that the compression format
   77          * type (zlib or gzip) should be automatically detected.
   78          */
   79         if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != Z_OK)
   80                 return (err);
   81 
   82         if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
   83                 (void) inflateEnd(&zs);
   84                 return (err == Z_OK ? Z_BUF_ERROR : err);
   85         }
   86 
   87         *dstlen = zs.total_out;
   88         return (inflateEnd(&zs));
   89 }
   90 
   91 int
   92 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
   93     int level)
   94 {
   95 
   96         z_stream zs;
   97         int err;
   98 
   99         bzero(&zs, sizeof (zs));
  100         zs.next_in = (uchar_t *)src;
  101         zs.avail_in = srclen;
  102         zs.next_out = dst;
  103         zs.avail_out = *dstlen;
  104         zs.zalloc = zfs_zcalloc;
  105         zs.zfree = zfs_zcfree;
  106 
  107         if ((err = deflateInit(&zs, level)) != Z_OK)
  108                 return (err);
  109 
  110         if ((err = deflate(&zs, Z_FINISH)) != Z_STREAM_END) {
  111                 (void) deflateEnd(&zs);
  112                 return (err == Z_OK ? Z_BUF_ERROR : err);
  113         }
  114 
  115         *dstlen = zs.total_out;
  116         return (deflateEnd(&zs));
  117 }
  118 
  119 int
  120 z_compress(void *dst, size_t *dstlen, const void *src, size_t srclen)
  121 {
  122         return (z_compress_level(dst, dstlen, src, srclen,
  123             Z_DEFAULT_COMPRESSION));
  124 }
  125 
  126 /*
  127  * Convert a zlib error code into a string error message.
  128  */
  129 const char *
  130 z_strerror(int err)
  131 {
  132         int i = Z_NEED_DICT - err;
  133 
  134         if (i < 0 || i > Z_NEED_DICT - Z_VERSION_ERROR)
  135                 return ("unknown error");
  136 
  137         return (zError(err));
  138 }

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FreeBSD/Linux Kernel Cross Reference sys/cddl/contrib/opensolaris/uts/common/zmod/zmod.c

FreeBSD/Linux Kernel Cross Reference
sys/cddl/contrib/opensolaris/uts/common/zmod/zmod.c