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

Copyright (C) 2013, 2017, MariaDB Corporation. 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

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

/******************************************************************//**
@file include/fsp0pagecompress.ic
Implementation for helper functions for extracting/storing page
compression and atomic writes information to file space.

Created 11/12/2013 Jan Lindström jan.lindstrom@mariadb.com

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

/********************************************************************//**
Determine the tablespace is page compression level from dict_table_t::flags.
@return	page compression level or 0 if not compressed*/
UNIV_INLINE
ulint
fsp_flags_get_page_compression_level(
/*=================================*/
	ulint	flags)	/*!< in: tablespace flags */
{
	return(FSP_FLAGS_GET_PAGE_COMPRESSION_LEVEL(flags));
}

/********************************************************************//**
Determine the tablespace is using atomic writes from dict_table_t::flags.
@return	true if atomic writes is used, false if not */
UNIV_INLINE
atomic_writes_t
fsp_flags_get_atomic_writes(
/*========================*/
	ulint	flags)	/*!< in: tablespace flags */
{
	return((atomic_writes_t)FSP_FLAGS_GET_ATOMIC_WRITES(flags));
}

/*******************************************************************//**
Find out wheather the page is index page or not
@return	true if page type index page, false if not */
UNIV_INLINE
ibool
fil_page_is_index_page(
/*===================*/
	byte*	buf)	/*!< in: page */
{
	return(mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_INDEX);
}

/*******************************************************************//**
Find out wheather the page is page compressed
@return	true if page is page compressed, false if not */
UNIV_INLINE
ibool
fil_page_is_compressed(
/*===================*/
	byte*	buf)	/*!< in: page */
{
	return(mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_PAGE_COMPRESSED);
}

/*******************************************************************//**
Find out wheather the page is page compressed
@return	true if page is page compressed, false if not */
UNIV_INLINE
ibool
fil_page_is_compressed_encrypted(
/*=============================*/
	byte*	buf)	/*!< in: page */
{
	return(mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED);
}

/****************************************************************//**
Get the name of the compression algorithm used for page
compression.
@return compression algorithm name or "UNKNOWN" if not known*/
UNIV_INLINE
const char*
fil_get_compression_alg_name(
/*=========================*/
       ulint	comp_alg)	/*!<in: compression algorithm number */
{
	switch(comp_alg) {
	case PAGE_UNCOMPRESSED:
		return ("uncompressed");
		break;
	case PAGE_ZLIB_ALGORITHM:
		return ("ZLIB");
		break;
	case PAGE_LZ4_ALGORITHM:
		return ("LZ4");
		break;
	case PAGE_LZO_ALGORITHM:
		return ("LZO");
		break;
	case PAGE_LZMA_ALGORITHM:
		return ("LZMA");
		break;
	case PAGE_BZIP2_ALGORITHM:
		return ("BZIP2");
		break;
	case PAGE_SNAPPY_ALGORITHM:
		return ("SNAPPY");
		break;
	/* No default to get compiler warning */
	}

	return ("NULL");
}

#ifndef UNIV_INNOCHECKSUM
/*******************************************************************//**
Find out wheather the page is page compressed with lzo method
@return	true if page is page compressed with lzo method, false if not */
UNIV_INLINE
ibool
fil_page_is_lzo_compressed(
/*=======================*/
	byte*	buf)	/*!< in: page */
{
	return((mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_PAGE_COMPRESSED &&
			mach_read_from_8(buf+FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION) == PAGE_LZO_ALGORITHM) ||
	       (mach_read_from_2(buf+FIL_PAGE_TYPE) == FIL_PAGE_PAGE_COMPRESSED_ENCRYPTED &&
			mach_read_from_2(buf+FIL_PAGE_DATA+FIL_PAGE_COMPRESSED_SIZE) == PAGE_LZO_ALGORITHM));
}

#endif /* UNIV_INNOCHECKSUM */