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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
130 lines
4.5 KiB
C++
130 lines
4.5 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, 2022, 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.cc
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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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#include "buf0checksum.h"
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#include "fil0fil.h"
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#include "my_sys.h"
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#ifndef UNIV_INNOCHECKSUM
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# include "srv0srv.h"
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#endif /* !UNIV_INNOCHECKSUM */
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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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{
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/* Note: innodb_checksum_algorithm=crc32 could and should have
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included the entire page in the checksum, and CRC-32 values
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should be combined with the CRC-32 function, not with
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exclusive OR. We stick to the current algorithm in order to
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remain compatible with old data files. */
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return my_crc32c(0, page + FIL_PAGE_OFFSET,
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FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION
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- FIL_PAGE_OFFSET)
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^ my_crc32c(0, page + FIL_PAGE_DATA,
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srv_page_size
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- (FIL_PAGE_DATA + FIL_PAGE_END_LSN_OLD_CHKSUM));
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}
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#ifndef UNIV_INNOCHECKSUM
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static inline ulint ut_fold_ulint_pair(ulint n1, ulint n2)
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{
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return ((((n1 ^ n2 ^ 1653893711) << 8) + n1) ^ 1463735687) + n2;
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}
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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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{
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ulint fold= 0;
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for (const byte *const str_end= str + (len & 0xFFFFFFF8); str < str_end;
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str+= 8)
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{
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fold= ut_fold_ulint_pair(fold, str[0]);
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fold= ut_fold_ulint_pair(fold, str[1]);
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fold= ut_fold_ulint_pair(fold, str[2]);
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fold= ut_fold_ulint_pair(fold, str[3]);
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fold= ut_fold_ulint_pair(fold, str[4]);
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fold= ut_fold_ulint_pair(fold, str[5]);
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fold= ut_fold_ulint_pair(fold, str[6]);
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fold= ut_fold_ulint_pair(fold, str[7]);
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}
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switch (len & 0x7) {
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case 7:
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fold= ut_fold_ulint_pair(fold, *str++);
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/* fall through */
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case 6:
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fold= ut_fold_ulint_pair(fold, *str++);
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/* fall through */
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case 5:
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fold= ut_fold_ulint_pair(fold, *str++);
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/* fall through */
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case 4:
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fold= ut_fold_ulint_pair(fold, *str++);
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/* fall through */
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case 3:
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fold= ut_fold_ulint_pair(fold, *str++);
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/* fall through */
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case 2:
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fold= ut_fold_ulint_pair(fold, *str++);
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/* fall through */
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case 1:
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fold= ut_fold_ulint_pair(fold, *str++);
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}
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return fold;
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}
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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 buf_calc_page_new_checksum(const byte *page) noexcept
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{
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ulint checksum;
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/* Since the field FIL_PAGE_FILE_FLUSH_LSN, and in versions <= 4.1.x
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FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID, are written outside the buffer pool
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to the first pages of data files, we have to skip them in the page
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checksum calculation.
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We must also skip the field FIL_PAGE_SPACE_OR_CHKSUM where the
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checksum is stored, and also the last 8 bytes of page because
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there we store the old formula checksum. */
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checksum = ut_fold_binary(page + FIL_PAGE_OFFSET,
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FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION
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- FIL_PAGE_OFFSET)
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+ ut_fold_binary(page + FIL_PAGE_DATA,
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srv_page_size - FIL_PAGE_DATA
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- FIL_PAGE_END_LSN_OLD_CHKSUM);
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return(static_cast<uint32_t>(checksum));
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}
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#endif /* !UNIV_INNOCHECKSUM */
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