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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 #ifndef _SYS_ZIO_COMPRESS_H
     28 #define	_SYS_ZIO_COMPRESS_H
     29 
     30 #pragma ident	"@(#)zio_compress.h	1.2	07/03/22 SMI"
     31 
     32 #include <sys/zio.h>
     33 
     34 #ifdef	__cplusplus
     35 extern "C" {
     36 #endif
     37 
     38 /*
     39  * Common signature for all zio compress/decompress functions.
     40  */
     41 typedef size_t zio_compress_func_t(void *src, void *dst,
     42     size_t s_len, size_t d_len, int);
     43 typedef int zio_decompress_func_t(void *src, void *dst,
     44     size_t s_len, size_t d_len, int);
     45 
     46 /*
     47  * Information about each compression function.
     48  */
     49 typedef struct zio_compress_info {
     50 	zio_compress_func_t	*ci_compress;	/* compression function */
     51 	zio_decompress_func_t	*ci_decompress;	/* decompression function */
     52 	int			ci_level;	/* level parameter */
     53 	char			*ci_name;	/* algorithm name */
     54 } zio_compress_info_t;
     55 
     56 extern zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS];
     57 
     58 /*
     59  * Compression routines.
     60  */
     61 extern size_t lzjb_compress(void *src, void *dst, size_t s_len, size_t d_len,
     62     int level);
     63 extern int lzjb_decompress(void *src, void *dst, size_t s_len, size_t d_len,
     64     int level);
     65 extern size_t gzip_compress(void *src, void *dst, size_t s_len, size_t d_len,
     66     int level);
     67 extern int gzip_decompress(void *src, void *dst, size_t s_len, size_t d_len,
     68     int level);
     69 
     70 /*
     71  * Compress and decompress data if necessary.
     72  */
     73 extern int zio_compress_data(int cpfunc, void *src, uint64_t srcsize,
     74     void **destp, uint64_t *destsizep, uint64_t *destbufsizep);
     75 extern int zio_decompress_data(int cpfunc, void *src, uint64_t srcsize,
     76     void *dest, uint64_t destsize);
     77 
     78 #ifdef	__cplusplus
     79 }
     80 #endif
     81 
     82 #endif	/* _SYS_ZIO_COMPRESS_H */
     83