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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Portions Copyright 2022 Mikhail Zakharov <zmey20000@yahoo.com>
*/
#include <contrib/zlib/zlib.h>
#include <contrib/zlib/zutil.h>
static void *
zfs_zcalloc(void *opaque __unused, uint_t items, uint_t size)
{
return (calloc(items, size));
}
static void
zfs_zcfree(void *opaque __unused, void *ptr)
{
free(ptr);
}
/*
* Uncompress the buffer 'src' into the buffer 'dst'. The caller must store
* the expected decompressed data size externally so it can be passed in.
* The resulting decompressed size is then returned through dstlen. This
* function return Z_OK on success, or another error code on failure.
*/
static inline int
z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
{
z_stream zs;
int err;
bzero(&zs, sizeof (zs));
zs.next_in = (unsigned char *)src;
zs.avail_in = srclen;
zs.next_out = dst;
zs.avail_out = *dstlen;
zs.zalloc = zfs_zcalloc;
zs.zfree = zfs_zcfree;
/*
* Call inflateInit2() specifying a window size of DEF_WBITS
* with the 6th bit set to indicate that the compression format
* type (zlib or gzip) should be automatically detected.
*/
if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != Z_OK)
return (err);
if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
(void) inflateEnd(&zs);
return (err == Z_OK ? Z_BUF_ERROR : err);
}
*dstlen = zs.total_out;
return (inflateEnd(&zs));
}
static int
gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len,
int n __unused)
{
size_t dstlen = d_len;
ASSERT(d_len >= s_len);
if (z_uncompress(d_start, &dstlen, s_start, s_len) != Z_OK)
return (-1);
return (0);
}
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