e50e40684a
As we do have zlib code in loader, we should also support gzip compression in zfs. PR: 153173 Submitted by: Mikhail Zakharov <zmey20000@yahoo.com> Reviewed by: imp, markj, delphij Differential Revision: https://reviews.freebsd.org/D35320 MFC after: 1 month
97 lines
2.5 KiB
C
97 lines
2.5 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Portions Copyright 2022 Mikhail Zakharov <zmey20000@yahoo.com>
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*/
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#include <contrib/zlib/zlib.h>
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#include <contrib/zlib/zutil.h>
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static void *
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zfs_zcalloc(void *opaque __unused, uint_t items, uint_t size)
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{
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return (calloc(items, size));
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}
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static void
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zfs_zcfree(void *opaque __unused, void *ptr)
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{
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free(ptr);
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}
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/*
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* Uncompress the buffer 'src' into the buffer 'dst'. The caller must store
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* the expected decompressed data size externally so it can be passed in.
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* The resulting decompressed size is then returned through dstlen. This
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* function return Z_OK on success, or another error code on failure.
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*/
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static inline int
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z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
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{
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z_stream zs;
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int err;
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bzero(&zs, sizeof (zs));
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zs.next_in = (unsigned char *)src;
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zs.avail_in = srclen;
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zs.next_out = dst;
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zs.avail_out = *dstlen;
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zs.zalloc = zfs_zcalloc;
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zs.zfree = zfs_zcfree;
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/*
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* Call inflateInit2() specifying a window size of DEF_WBITS
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* with the 6th bit set to indicate that the compression format
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* type (zlib or gzip) should be automatically detected.
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*/
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if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != Z_OK)
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return (err);
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if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
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(void) inflateEnd(&zs);
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return (err == Z_OK ? Z_BUF_ERROR : err);
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}
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*dstlen = zs.total_out;
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return (inflateEnd(&zs));
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}
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static int
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gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len,
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int n __unused)
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{
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size_t dstlen = d_len;
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ASSERT(d_len >= s_len);
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if (z_uncompress(d_start, &dstlen, s_start, s_len) != Z_OK)
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return (-1);
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return (0);
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}
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