gzip.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 2007 Sun Microsystems, Inc.  All rights reserved.
   24  * Use is subject to license terms.
   25  */
   26 
   27 /*
   28  * Portions Copyright 2022 Mikhail Zakharov <zmey20000@yahoo.com>
   29  */
   30 
   31 #include <contrib/zlib/zlib.h>
   32 #include <contrib/zlib/zutil.h>
   33 
   34 static void *
   35 zfs_zcalloc(void *opaque __unused, uint_t items, uint_t size)
   36 {
   37 
   38         return (calloc(items, size));
   39 }
   40 
   41 static void
   42 zfs_zcfree(void *opaque __unused, void *ptr)
   43 {
   44         free(ptr);
   45 }
   46 
   47 /*
   48  * Uncompress the buffer 'src' into the buffer 'dst'.  The caller must store
   49  * the expected decompressed data size externally so it can be passed in.
   50  * The resulting decompressed size is then returned through dstlen.  This
   51  * function return Z_OK on success, or another error code on failure.
   52  */
   53 static inline int
   54 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
   55 {
   56         z_stream zs;
   57         int err;
   58 
   59         bzero(&zs, sizeof (zs));
   60         zs.next_in = (unsigned char *)src;
   61         zs.avail_in = srclen;
   62         zs.next_out = dst;
   63         zs.avail_out = *dstlen;
   64         zs.zalloc = zfs_zcalloc;
   65         zs.zfree = zfs_zcfree;
   66 
   67         /*
   68          * Call inflateInit2() specifying a window size of DEF_WBITS
   69          * with the 6th bit set to indicate that the compression format
   70          * type (zlib or gzip) should be automatically detected.
   71          */
   72         if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != Z_OK)
   73                 return (err);
   74 
   75         if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
   76                 (void) inflateEnd(&zs);
   77                 return (err == Z_OK ? Z_BUF_ERROR : err);
   78         }
   79 
   80         *dstlen = zs.total_out;
   81         return (inflateEnd(&zs));
   82 }
   83 
   84 static int
   85 gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len,
   86     int n __unused)
   87 {
   88         size_t dstlen = d_len;
   89 
   90         ASSERT(d_len >= s_len);
   91 
   92         if (z_uncompress(d_start, &dstlen, s_start, s_len) != Z_OK)
   93                 return (-1);
   94 
   95         return (0);
   96 }

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FreeBSD/Linux Kernel Cross Reference sys/cddl/boot/zfs/gzip.c

FreeBSD/Linux Kernel Cross Reference
sys/cddl/boot/zfs/gzip.c