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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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     28 
     29 #include <sys/debug.h>
     30 #include <sys/types.h>
     31 #include <sys/zmod.h>
     32 
     33 #ifdef _KERNEL
     34 #include <sys/systm.h>
     35 #else
     36 #include <strings.h>
     37 #endif
     38 
     39 size_t
     40 gzip_compress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
     41 {
     42 	size_t dstlen = d_len;
     43 
     44 	ASSERT(d_len <= s_len);
     45 
     46 	if (z_compress_level(d_start, &dstlen, s_start, s_len, n) != Z_OK) {
     47 		if (d_len != s_len)
     48 			return (s_len);
     49 
     50 		bcopy(s_start, d_start, s_len);
     51 		return (s_len);
     52 	}
     53 
     54 	return (dstlen);
     55 }
     56 
     57 /*ARGSUSED*/
     58 int
     59 gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n)
     60 {
     61 	size_t dstlen = d_len;
     62 
     63 	ASSERT(d_len >= s_len);
     64 
     65 	if (z_uncompress(d_start, &dstlen, s_start, s_len) != Z_OK)
     66 		return (-1);
     67 
     68 	return (0);
     69 }
     70