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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  * Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
     28  */
     29 
     30 #ifndef _SYS_ZIO_COMPRESS_H
     31 #define	_SYS_ZIO_COMPRESS_H
     32 
     33 #include <sys/zio.h>
     34 
     35 #ifdef	__cplusplus
     36 extern "C" {
     37 #endif
     38 
     39 /* Common signature for all zio compress functions. */
     40 typedef size_t zio_compress_func_t(void *src, void *dst,
     41     size_t s_len, size_t d_len, int);
     42 /* Common signature for all zio decompress functions. */
     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 extern size_t zle_compress(void *src, void *dst, size_t s_len, size_t d_len,
     70     int level);
     71 extern int zle_decompress(void *src, void *dst, size_t s_len, size_t d_len,
     72     int level);
     73 #ifdef __FreeBSD__
     74 extern void lz4_init(void);
     75 extern void lz4_fini(void);
     76 #else
     77 #define lz4_init() /* nothing */
     78 #define lz4_fini() /* nothing */
     79 #endif
     80 extern size_t lz4_compress(void *src, void *dst, size_t s_len, size_t d_len,
     81     int level);
     82 extern int lz4_decompress(void *src, void *dst, size_t s_len, size_t d_len,
     83     int level);
     84 
     85 /*
     86  * Compress and decompress data if necessary.
     87  */
     88 extern size_t zio_compress_data(enum zio_compress c, void *src, void *dst,
     89     size_t s_len);
     90 extern int zio_decompress_data(enum zio_compress c, void *src, void *dst,
     91     size_t s_len, size_t d_len);
     92 
     93 /*
     94  * Module lifetime management.
     95  */
     96 extern void zio_compress_init(void);
     97 extern void zio_compress_fini(void);
     98 
     99 #ifdef	__cplusplus
    100 }
    101 #endif
    102 
    103 #endif	/* _SYS_ZIO_COMPRESS_H */
    104