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83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/*****************************************************************************
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Copyright (c) 1995, 2011, Oracle and/or its affiliates. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file buf/buf0checksum.h
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Buffer pool checksum functions, also linked from /extra/innochecksum.cc
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Created Aug 11, 2011 Vasil Dimov
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*******************************************************/
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#ifndef buf0checksum_h
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#define buf0checksum_h
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#include "univ.i"
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#include "buf0types.h"
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/** Magic value to use instead of checksums when they are disabled */
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#define BUF_NO_CHECKSUM_MAGIC 0xDEADBEEFUL
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/********************************************************************//**
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Calculates a page CRC32 which is stored to the page when it is written
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to a file. Note that we must be careful to calculate the same value on
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32-bit and 64-bit architectures.
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@return checksum */
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UNIV_INTERN
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ib_uint32_t
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buf_calc_page_crc32(
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/*================*/
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const byte* page); /*!< in: buffer page */
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/********************************************************************//**
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Calculates a page checksum which is stored to the page when it is written
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to a file. Note that we must be careful to calculate the same value on
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32-bit and 64-bit architectures.
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@return checksum */
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UNIV_INTERN
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ulint
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buf_calc_page_new_checksum(
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/*=======================*/
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const byte* page); /*!< in: buffer page */
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/********************************************************************//**
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In versions < 4.0.14 and < 4.1.1 there was a bug that the checksum only
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looked at the first few bytes of the page. This calculates that old
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checksum.
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NOTE: we must first store the new formula checksum to
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FIL_PAGE_SPACE_OR_CHKSUM before calculating and storing this old checksum
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because this takes that field as an input!
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@return checksum */
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UNIV_INTERN
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ulint
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buf_calc_page_old_checksum(
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/*=======================*/
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const byte* page); /*!< in: buffer page */
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/********************************************************************//**
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Return a printable string describing the checksum algorithm.
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@return algorithm name */
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UNIV_INTERN
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const char*
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buf_checksum_algorithm_name(
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/*========================*/
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srv_checksum_algorithm_t algo); /*!< in: algorithm */
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extern ulong srv_checksum_algorithm;
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#endif /* buf0checksum_h */
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