diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 12:24:36 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-13 12:24:36 +0000 |
commit | 06eaf7232e9a920468c0f8d74dcf2fe8b555501c (patch) | |
tree | e2c7b5777f728320e5b5542b6213fd3591ba51e2 /storage/maria/ma_checksum.c | |
parent | Initial commit. (diff) | |
download | mariadb-06eaf7232e9a920468c0f8d74dcf2fe8b555501c.tar.xz mariadb-06eaf7232e9a920468c0f8d74dcf2fe8b555501c.zip |
Adding upstream version 1:10.11.6.upstream/1%10.11.6
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'storage/maria/ma_checksum.c')
-rw-r--r-- | storage/maria/ma_checksum.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/storage/maria/ma_checksum.c b/storage/maria/ma_checksum.c new file mode 100644 index 00000000..baac18af --- /dev/null +++ b/storage/maria/ma_checksum.c @@ -0,0 +1,89 @@ +/* Copyright (C) 2006 MySQL AB & MySQL Finland AB & TCX DataKonsult AB + + 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 */ + +/* Calculate a checksum for a row */ + +#include "maria_def.h" + +/** + Calculate a checksum for the record + + _ma_checksum() + @param info Maria handler + @param record Record + + @note + To ensure that the checksum is independent of the row format + we need to always calculate the checksum in the original field order. + + @return checksum +*/ + +ha_checksum _ma_checksum(MARIA_HA *info, const uchar *record) +{ + ha_checksum crc=0; + uint i,end; + MARIA_COLUMNDEF *base_column= info->s->columndef; + uint16 *column_nr= info->s->column_nr; + + if (info->s->base.null_bytes) + crc= my_checksum(crc, record, info->s->base.null_bytes); + + for (i= 0, end= info->s->base.fields ; i < end ; i++) + { + MARIA_COLUMNDEF *column= base_column + column_nr[i]; + const uchar *pos; + ulong length; + + if (record[column->null_pos] & column->null_bit) + continue; /* Null field */ + + pos= record + column->offset; + switch (column->type) { + case FIELD_BLOB: + { + uint blob_size_length= column->length- portable_sizeof_char_ptr; + length= _ma_calc_blob_length(blob_size_length, pos); + if (length) + { + memcpy((char**) &pos, pos + blob_size_length, sizeof(char*)); + crc= my_checksum(crc, pos, length); + } + continue; + } + case FIELD_VARCHAR: + { + uint pack_length= column->fill_length; + if (pack_length == 1) + length= (ulong) *pos; + else + length= uint2korr(pos); + pos+= pack_length; /* Skip length information */ + break; + } + default: + length= column->length; + break; + } + crc= my_checksum(crc, pos, length); + } + return crc; +} + + +ha_checksum _ma_static_checksum(MARIA_HA *info, const uchar *pos) +{ + return my_checksum(0, pos, info->s->base.reclength); +} |