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OpenBoard/thirdparty/mera/pdf-merger/ASCIIHexDecode.cpp

61 lines
1.2 KiB

#include "ASCIIHexDecode.h"
#include <string>
#include "Utils.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::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( WHITESPACES.find(ch) != std::string::npos )
{
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;
}