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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 2009 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 #include <sys/zio.h>
     31 
     32 #ifdef	__cplusplus
     33 extern "C" {
     34 #endif
     35 
     36 /*
     37  * Common signature for all zio compress/decompress functions.
     38  */
     39 typedef size_t zio_compress_func_t(void *src, void *dst,
     40     size_t s_len, size_t d_len, int);
     41 typedef int zio_decompress_func_t(void *src, void *dst,
     42     size_t s_len, size_t d_len, int);
     43 
     44 /*
     45  * Information about each compression function.
     46  */
     47 typedef struct zio_compress_info {
     48 	zio_compress_func_t	*ci_compress;	/* compression function */
     49 	zio_decompress_func_t	*ci_decompress;	/* decompression function */
     50 	int			ci_level;	/* level parameter */
     51 	char			*ci_name;	/* algorithm name */
     52 } zio_compress_info_t;
     53 
     54 extern zio_compress_info_t zio_compress_table[ZIO_COMPRESS_FUNCTIONS];
     55 
     56 /*
     57  * Compression routines.
     58  */
     59 extern size_t lzjb_compress(void *src, void *dst, size_t s_len, size_t d_len,
     60     int level);
     61 extern int lzjb_decompress(void *src, void *dst, size_t s_len, size_t d_len,
     62     int level);
     63 extern size_t gzip_compress(void *src, void *dst, size_t s_len, size_t d_len,
     64     int level);
     65 extern int gzip_decompress(void *src, void *dst, size_t s_len, size_t d_len,
     66     int level);
     67 extern size_t zle_compress(void *src, void *dst, size_t s_len, size_t d_len,
     68     int level);
     69 extern int zle_decompress(void *src, void *dst, size_t s_len, size_t d_len,
     70     int level);
     71 
     72 /*
     73  * Compress and decompress data if necessary.
     74  */
     75 extern size_t zio_compress_data(enum zio_compress c, void *src, void *dst,
     76     size_t s_len);
     77 extern int zio_decompress_data(enum zio_compress c, void *src, void *dst,
     78     size_t s_len, size_t d_len);
     79 
     80 #ifdef	__cplusplus
     81 }
     82 #endif
     83 
     84 #endif	/* _SYS_ZIO_COMPRESS_H */
     85