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OpenBoard/src/pdf-merger/ASCIIHexDecode.cpp

89 lines
2.0 KiB

13 years ago
/*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "ASCIIHexDecode.h"
#include <QtGlobal>
#include <string>
#include "Utils.h"
#include "core/memcheck.h"
using namespace merge_lib;
const std::string WHITESPACES(" \t\f\v\n\r");
#define HEX_TO_VAL(char_c) (char_c)>9?'A'+(char_c)-10:'0'+(char_c);
static unsigned int convertHexVal(unsigned char c)
{
if(c >= '0' && c <= '9')
{
return (c - '0');
}
if(c >= 'A' && c <= 'F')
{
return (c - 'A' + 10);
}
if(c >= 'a' && c <= 'f')
{
return (c - 'a' + 10);
}
return 0;
}
bool ASCIIHexDecode::encode(std::string & decoded)
{
Q_UNUSED(decoded);
return false;
}
bool ASCIIHexDecode::decode(std::string & encoded)
{
bool isLow = true;
unsigned char decodedChar = '\0';
int len = encoded.size();
std::string decoded ="";
for(int i = 0;i<len;i++)
{
unsigned char ch = encoded[i];
if((int) WHITESPACES.find(ch) != -1 )
{
continue;
}
if( ch == '>' )
{
continue; // EOD found
}
ch = convertHexVal(ch);
if( isLow )
{
decodedChar = (ch & 0x0F);
isLow = false;
}
else
{
decodedChar = ((decodedChar << 4) | ch);
isLow = true;
decoded += decodedChar;
}
}
encoded = decoded;
return true;
}
void ASCIIHexDecode::initialize(Object * objectWithStram)
{
Q_UNUSED(objectWithStram);
}