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Diffstat (limited to 'storage/innobase/include/buf0checksum.h')
-rw-r--r-- | storage/innobase/include/buf0checksum.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/storage/innobase/include/buf0checksum.h b/storage/innobase/include/buf0checksum.h new file mode 100644 index 00000000000..cd21781dc6e --- /dev/null +++ b/storage/innobase/include/buf0checksum.h @@ -0,0 +1,88 @@ +/***************************************************************************** + +Copyright (c) 1995, 2011, Oracle and/or its affiliates. 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 Street, Suite 500, Boston, MA 02110-1335 USA + +*****************************************************************************/ + +/**************************************************//** +@file buf/buf0checksum.h +Buffer pool checksum functions, also linked from /extra/innochecksum.cc + +Created Aug 11, 2011 Vasil Dimov +*******************************************************/ + +#ifndef buf0checksum_h +#define buf0checksum_h + +#include "univ.i" + +#ifndef UNIV_INNOCHECKSUM + +#include "buf0types.h" + +#endif /* !UNIV_INNOCHECKSUM */ + +/********************************************************************//** +Calculates a page CRC32 which is stored to the page when it is written +to a file. Note that we must be careful to calculate the same value on +32-bit and 64-bit architectures. +@return checksum */ +UNIV_INTERN +ib_uint32_t +buf_calc_page_crc32( +/*================*/ + const byte* page); /*!< in: buffer page */ + +/********************************************************************//** +Calculates a page checksum which is stored to the page when it is written +to a file. Note that we must be careful to calculate the same value on +32-bit and 64-bit architectures. +@return checksum */ +UNIV_INTERN +ulint +buf_calc_page_new_checksum( +/*=======================*/ + const byte* page); /*!< in: buffer page */ + +/********************************************************************//** +In versions < 4.0.14 and < 4.1.1 there was a bug that the checksum only +looked at the first few bytes of the page. This calculates that old +checksum. +NOTE: we must first store the new formula checksum to +FIL_PAGE_SPACE_OR_CHKSUM before calculating and storing this old checksum +because this takes that field as an input! +@return checksum */ +UNIV_INTERN +ulint +buf_calc_page_old_checksum( +/*=======================*/ + const byte* page); /*!< in: buffer page */ + +#ifndef UNIV_INNOCHECKSUM + +/********************************************************************//** +Return a printable string describing the checksum algorithm. +@return algorithm name */ +UNIV_INTERN +const char* +buf_checksum_algorithm_name( +/*========================*/ + srv_checksum_algorithm_t algo); /*!< in: algorithm */ + +extern ulong srv_checksum_algorithm; + +#endif /* !UNIV_INNOCHECKSUM */ + +#endif /* buf0checksum_h */ |