mirror of
https://github.com/MariaDB/server.git
synced 2025-11-03 20:36:16 +01:00
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++
/*****************************************************************************
|
|
|
|
Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
|
|
Copyright (c) 2017, 2022, MariaDB Corporation.
|
|
|
|
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, Fifth Floor, Boston, MA 02110-1335 USA
|
|
|
|
*****************************************************************************/
|
|
|
|
/**************************************************//**
|
|
@file buf/buf0checksum.cc
|
|
Buffer pool checksum functions, also linked from /extra/innochecksum.cc
|
|
|
|
Created Aug 11, 2011 Vasil Dimov
|
|
*******************************************************/
|
|
|
|
#include "buf0checksum.h"
|
|
#include "fil0fil.h"
|
|
#include "my_sys.h"
|
|
|
|
#ifndef UNIV_INNOCHECKSUM
|
|
# include "srv0srv.h"
|
|
#endif /* !UNIV_INNOCHECKSUM */
|
|
|
|
/** Calculate the CRC32 checksum of a page. The value is stored to the page
|
|
when it is written to a file and also checked for a match when reading from
|
|
the file. Note that we must be careful to calculate the same value on all
|
|
architectures.
|
|
@param[in] page buffer page (srv_page_size bytes)
|
|
@return CRC-32C */
|
|
uint32_t buf_calc_page_crc32(const byte *page) noexcept
|
|
{
|
|
/* Note: innodb_checksum_algorithm=crc32 could and should have
|
|
included the entire page in the checksum, and CRC-32 values
|
|
should be combined with the CRC-32 function, not with
|
|
exclusive OR. We stick to the current algorithm in order to
|
|
remain compatible with old data files. */
|
|
return my_crc32c(0, page + FIL_PAGE_OFFSET,
|
|
FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION
|
|
- FIL_PAGE_OFFSET)
|
|
^ my_crc32c(0, page + FIL_PAGE_DATA,
|
|
srv_page_size
|
|
- (FIL_PAGE_DATA + FIL_PAGE_END_LSN_OLD_CHKSUM));
|
|
}
|
|
|
|
#ifndef UNIV_INNOCHECKSUM
|
|
static inline ulint ut_fold_ulint_pair(ulint n1, ulint n2)
|
|
{
|
|
return ((((n1 ^ n2 ^ 1653893711) << 8) + n1) ^ 1463735687) + n2;
|
|
}
|
|
|
|
/** Fold a binary string, similar to innodb_checksum_algorithm=innodb.
|
|
@return folded value */
|
|
ulint ut_fold_binary(const byte *str, size_t len) noexcept
|
|
{
|
|
ulint fold= 0;
|
|
for (const byte *const str_end= str + (len & 0xFFFFFFF8); str < str_end;
|
|
str+= 8)
|
|
{
|
|
fold= ut_fold_ulint_pair(fold, str[0]);
|
|
fold= ut_fold_ulint_pair(fold, str[1]);
|
|
fold= ut_fold_ulint_pair(fold, str[2]);
|
|
fold= ut_fold_ulint_pair(fold, str[3]);
|
|
fold= ut_fold_ulint_pair(fold, str[4]);
|
|
fold= ut_fold_ulint_pair(fold, str[5]);
|
|
fold= ut_fold_ulint_pair(fold, str[6]);
|
|
fold= ut_fold_ulint_pair(fold, str[7]);
|
|
}
|
|
|
|
switch (len & 0x7) {
|
|
case 7:
|
|
fold= ut_fold_ulint_pair(fold, *str++);
|
|
/* fall through */
|
|
case 6:
|
|
fold= ut_fold_ulint_pair(fold, *str++);
|
|
/* fall through */
|
|
case 5:
|
|
fold= ut_fold_ulint_pair(fold, *str++);
|
|
/* fall through */
|
|
case 4:
|
|
fold= ut_fold_ulint_pair(fold, *str++);
|
|
/* fall through */
|
|
case 3:
|
|
fold= ut_fold_ulint_pair(fold, *str++);
|
|
/* fall through */
|
|
case 2:
|
|
fold= ut_fold_ulint_pair(fold, *str++);
|
|
/* fall through */
|
|
case 1:
|
|
fold= ut_fold_ulint_pair(fold, *str++);
|
|
}
|
|
return fold;
|
|
}
|
|
|
|
/** Calculate a 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.
|
|
@param[in] page file page (srv_page_size bytes)
|
|
@return checksum */
|
|
uint32_t buf_calc_page_new_checksum(const byte *page) noexcept
|
|
{
|
|
ulint checksum;
|
|
|
|
/* Since the field FIL_PAGE_FILE_FLUSH_LSN, and in versions <= 4.1.x
|
|
FIL_PAGE_ARCH_LOG_NO_OR_SPACE_ID, are written outside the buffer pool
|
|
to the first pages of data files, we have to skip them in the page
|
|
checksum calculation.
|
|
We must also skip the field FIL_PAGE_SPACE_OR_CHKSUM where the
|
|
checksum is stored, and also the last 8 bytes of page because
|
|
there we store the old formula checksum. */
|
|
|
|
checksum = ut_fold_binary(page + FIL_PAGE_OFFSET,
|
|
FIL_PAGE_FILE_FLUSH_LSN_OR_KEY_VERSION
|
|
- FIL_PAGE_OFFSET)
|
|
+ ut_fold_binary(page + FIL_PAGE_DATA,
|
|
srv_page_size - FIL_PAGE_DATA
|
|
- FIL_PAGE_END_LSN_OLD_CHKSUM);
|
|
return(static_cast<uint32_t>(checksum));
|
|
}
|
|
#endif /* !UNIV_INNOCHECKSUM */
|