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52 lines
1.6 KiB
C++
52 lines
1.6 KiB
C++
/*
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Copyright (C) 2021, 2022 MariaDB Corporation
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; version 2 of
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the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* handling of the conversion of string prefixes to int64_t for quick range checking */
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#include "collation.h"
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#include "joblisttypes.h"
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#include "string_prefixes.h"
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// XXX: string (or, actually, a BLOB) with all NUL chars will be encoded into zero. Which corresponds to
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// encoding of empty string, or NULL.
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int64_t encodeStringPrefix(const uint8_t* str, size_t len, int charsetNumber)
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{
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datatypes::Charset cset(charsetNumber);
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uint8_t fixedLenPrefix[8];
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memset(fixedLenPrefix, 0, sizeof(fixedLenPrefix));
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cset.strnxfrm(fixedLenPrefix, sizeof(fixedLenPrefix), 8, str, len, 0);
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int64_t acc = 0;
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size_t i;
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for (i = 0; i < 8; i++)
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{
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uint8_t byte = fixedLenPrefix[i];
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acc = (acc << 8) + byte;
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}
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return acc;
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}
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int64_t encodeStringPrefix_check_null(const uint8_t* str, size_t len, int charsetNumber)
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{
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if (len < 1)
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{
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return joblist::UBIGINTNULL;
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}
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return encodeStringPrefix(str, len, charsetNumber);
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}
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