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75 lines
1.8 KiB
75 lines
1.8 KiB
/*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "ASCIIHexDecode.h"
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#include <string>
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#include "Utils.h"
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using namespace merge_lib;
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const std::string WHITESPACES(" \t\f\v\n\r");
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#define HEX_TO_VAL(char_c) (char_c)>9?'A'+(char_c)-10:'0'+(char_c);
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static unsigned int convertHexVal(unsigned char c)
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{
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if(c >= '0' && c <= '9')
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{
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return (c - '0');
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}
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if(c >= 'A' && c <= 'F')
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{
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return (c - 'A' + 10);
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}
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if(c >= 'a' && c <= 'f')
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{
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return (c - 'a' + 10);
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}
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return 0;
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}
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bool ASCIIHexDecode::decode(std::string & encoded)
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{
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bool isLow = true;
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unsigned char decodedChar = '\0';
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int len = encoded.size();
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std::string decoded ="";
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for(int i = 0;i<len;i++)
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{
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unsigned char ch = encoded[i];
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if( WHITESPACES.find(ch) != std::string::npos )
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{
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continue;
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}
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if( ch == '>' )
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{
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continue; // EOD found
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}
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ch = convertHexVal(ch);
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if( isLow )
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{
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decodedChar = (ch & 0x0F);
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isLow = false;
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}
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else
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{
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decodedChar = ((decodedChar << 4) | ch);
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isLow = true;
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decoded += decodedChar;
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}
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}
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encoded = decoded;
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return true;
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}
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