mariadb/storage/xtradb/include/fil0pagecompress.h

/*****************************************************************************

Copyright (C) 2013, 2018 MariaDB Corporation.

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 02110-1335 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
***********************************************************************/

/** Compress a page_compressed page before writing to a data file.
@param[in]	buf		page to be compressed
@param[out]	out_buf		compressed page
@param[in]	level		compression level
@param[in]	block_size	file system block size
@param[in]	encrypted	whether the page will be subsequently encrypted
@return actual length of compressed page
@retval	0	if the page was not compressed */
UNIV_INTERN ulint fil_page_compress(const byte* buf, byte* out_buf, ulint level,
				    ulint block_size, bool encrypted)
	MY_ATTRIBUTE((nonnull, warn_unused_result));

/** Decompress a page that may be subject to page_compressed compression.
@param[in,out]	tmp_buf		temporary buffer (of innodb_page_size)
@param[in,out]	buf		compressed page buffer
@return size of the compressed data
@retval	0		if decompression failed
@retval	srv_page_size	if the page was not compressed */
UNIV_INTERN ulint fil_page_decompress(byte* tmp_buf, byte* buf)
	MY_ATTRIBUTE((nonnull, warn_unused_result));

/****************************************************************//**
Get block size from fil node
@return block size*/
UNIV_INLINE
ulint
fil_node_get_block_size(
	fil_node_t*	node);	/*!< in: Node where to get block
				size */
/*******************************************************************//**
Find out wheather the page is page compressed
@return	true if page is page compressed*/
UNIV_INLINE
ibool
fil_page_is_compressed(
/*===================*/
	byte*	buf);	/*!< in: page */

/*******************************************************************//**
Find out wheather the page is page compressed
@return	true if page is page compressed*/
UNIV_INLINE
ibool
fil_page_is_compressed_encrypted(
/*=============================*/
	byte*	buf);	/*!< in: page */
#endif