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4dd6131711
Now that ut_fold_ulint_pair() and ut_fold_binary() are no longer needed for anything else than compatibility with old InnoDB data files that may use innodb_checksum_algorithm=innodb, let us move the code to a single compilation unit. Reviewed by: Vladislav Lesin
55 lines
2.3 KiB
C
55 lines
2.3 KiB
C
/*****************************************************************************
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Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2017, 2021, MariaDB Corporation.
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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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#pragma once
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#include "buf0types.h"
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/** Calculate the CRC32 checksum of a page. The value is stored to the page
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when it is written to a file and also checked for a match when reading from
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the file. Note that we must be careful to calculate the same value on all
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architectures.
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@param[in] page buffer page (srv_page_size bytes)
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@return CRC-32C */
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uint32_t buf_calc_page_crc32(const byte *page) noexcept;
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#ifndef UNIV_INNOCHECKSUM
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/** Fold a binary string, similar to innodb_checksum_algorithm=innodb.
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@return folded value */
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ulint ut_fold_binary(const byte *str, size_t len) noexcept;
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/** Calculate a 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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@param[in] page file page (srv_page_size bytes)
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@return checksum */
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uint32_t
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buf_calc_page_new_checksum(const byte *page) noexcept;
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/** In MySQL before 4.0.14 or 4.1.1 there was an InnoDB bug that
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the checksum only looked at the first few bytes of the page.
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This calculates that old checksum. */
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# define buf_calc_page_old_checksum(page) uint32_t(ut_fold_binary(page, 26))
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#endif /* !UNIV_INNOCHECKSUM */
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