zfs/lib/libzpool/include/sys/zio_compress.h

   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   "%Z%%M% %I%     %E% 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 */