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104 lines
2.4 KiB
C++
104 lines
2.4 KiB
C++
/* Copyright (C) 2014 InfiniDB, Inc.
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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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/****************************************************************************
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* $Id: func_unhex.cpp 3923 2013-06-19 21:43:06Z bwilkinson $
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*
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*
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****************************************************************************/
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#include <cstdlib>
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#include <string>
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#include <sstream>
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using namespace std;
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#include "functor_str.h"
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#include "funchelpers.h"
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#include "functioncolumn.h"
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#include "rowgroup.h"
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using namespace execplan;
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#include "dataconvert.h"
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namespace
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{
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int64_t hex_to_int(char c)
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{
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if (c <= '9' && c >= '0')
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return c-'0';
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c = toupper(c);
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if (c <= 'F' && c >= 'A')
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return c-'A'+10;
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return -1;
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}
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}
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namespace funcexp
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{
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CalpontSystemCatalog::ColType Func_unhex::operationType( FunctionParm& fp, CalpontSystemCatalog::ColType& resultType )
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{
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return resultType;
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}
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string Func_unhex::getStrVal(rowgroup::Row& row,
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FunctionParm& parm,
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bool& isNull,
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CalpontSystemCatalog::ColType& op_ct)
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{
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const string& from = parm[0]->data()->getStrVal(row, isNull);
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char* to = new char[2 + from.length()/2];
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if (!to)
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{
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isNull = true;
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return "";
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}
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uint64_t from_pos = 0, to_pos = 0;
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int64_t hex_char = 0;
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if (strlen(from.c_str()) % 2)
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{
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hex_char = hex_to_int(from[from_pos++]);
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to[to_pos++] = hex_char;
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if (hex_char == -1)
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goto nullHandling;
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}
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for (; from_pos < strlen(from.c_str()); from_pos+=2)
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{
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hex_char = hex_to_int(from[from_pos]) << 4;
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if (hex_char == -1)
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goto nullHandling;
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to[to_pos] = hex_char;
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hex_char = hex_to_int(from[from_pos+1]);
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if (hex_char == -1)
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goto nullHandling;
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to[to_pos++] |= hex_char;
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}
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to[to_pos] = 0;
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return string(to);
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nullHandling:
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isNull = true;
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return "";
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}
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} // namespace funcexp
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// vim:ts=4 sw=4:
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