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/*****************************************************************************
Copyright (C) 2013 SkySQL Ab. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
#ifndef fil0pagecompress_h
#define fil0pagecompress_h
#include "fsp0fsp.h"
#include "fsp0pagecompress.h"
/******************************************************************//**
@file include/fil0pagecompress.h
Helper functions for extracting/storing page compression and
atomic writes information to table space.
Created 11/12/2013 Jan Lindström jan.lindstrom@skysql.com
***********************************************************************/
/*******************************************************************//**
Returns the page compression level flag of the space, or 0 if the space
is not compressed. The tablespace must be cached in the memory cache.
@return page compression level if page compressed, ULINT_UNDEFINED if space not found */
ulint
fil_space_get_page_compression_level(
/*=================================*/
ulint id); /*!< in: space id */
/*******************************************************************//**
Returns the page compression flag of the space, or false if the space
is not compressed. The tablespace must be cached in the memory cache.
@return true if page compressed, false if not or space not found */
ibool
fil_space_is_page_compressed(
/*=========================*/
ulint id); /*!< in: space id */
/*******************************************************************//**
Returns the atomic writes flag of the space, or false if the space
is not using atomic writes. The tablespace must be cached in the memory cache.
@return atomic write table option value */
atomic_writes_t
fil_space_get_atomic_writes(
/*=========================*/
ulint id); /*!< in: space id */
/*******************************************************************//**
Find out wheather the page is index page or not
@return true if page type index page, false if not */
ibool
fil_page_is_index_page(
/*===================*/
byte *buf); /*!< in: page */
/****************************************************************//**
Get the name of the compression algorithm used for page
compression.
@return compression algorithm name or "UNKNOWN" if not known*/
const char*
fil_get_compression_alg_name(
/*=========================*/
ulint comp_alg); /*!<in: compression algorithm number */
/****************************************************************//**
For page compressed pages compress the page before actual write
operation.
@return compressed page to be written*/
byte*
fil_compress_page(
/*==============*/
ulint space_id, /*!< in: tablespace id of the
table. */
byte* buf, /*!< in: buffer from which to write; in aio
this must be appropriately aligned */
byte* out_buf, /*!< out: compressed buffer */
ulint len, /*!< in: length of input buffer.*/
ulint* out_len); /*!< out: actual length of compressed page */
/****************************************************************//**
For page compressed pages decompress the page after actual read
operation.
@return uncompressed page */
void
fil_decompress_page(
/*================*/
byte* page_buf, /*!< in: preallocated buffer or NULL */
byte* buf, /*!< out: buffer from which to read; in aio
this must be appropriately aligned */
ulint len); /*!< in: length of output buffer.*/
/****************************************************************//**
Get space id from fil node
@return space id*/
ulint
fil_node_get_space_id(
/*==================*/
fil_node_t* node); /*!< in: Node where to get space id*/
/*******************************************************************//**
Find out wheather the page is page compressed
@return true if page is page compressed*/
ibool
fil_page_is_compressed(
/*===================*/
byte *buf); /*!< in: page */
#endif
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