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URLEncode.h

URLEncode.cpp

// HEX Values array
char hexVals[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};






// UNSAFE String
CString CURLEncode::csUnsafeString= "\"<>%\\^[]`+$,@:;/!#?=&";

// PURPOSE OF THIS FUNCTION IS TO CONVERT A GIVEN CHAR TO URL HEX FORM
CString CURLEncode::convert(char val) 
{
    CString csRet;
    csRet += "%";
    csRet += decToHex(val, 16); 
    return  csRet;
}

// THIS IS A HELPER FUNCTION.
// PURPOSE OF THIS FUNCTION IS TO GENERATE A HEX REPRESENTATION OF GIVEN CHARACTER
CString CURLEncode::decToHex(char num, int radix)
{   
    int temp=0; 
    CString csTmp;
    int num_char;
    num_char = (int) num;
    
    // ISO-8859-1 
    // IF THE IF LOOP IS COMMENTED, THE CODE WILL FAIL TO GENERATE A 
    // PROPER URL ENCODE FOR THE CHARACTERS WHOSE RANGE IN 127-255(DECIMAL)
    if (num_char < 0)
        num_char = 256 + num_char;

    while (num_char >= radix)
    {
        temp = num_char % radix;
        num_char = (int)floor(num_char / radix);
        csTmp = hexVals[temp];
    }
    
    csTmp += hexVals[num_char];

    if(csTmp.GetLength() < 2)
    {
        csTmp += '0';
    }

    CString strdecToHex(csTmp);
    // Reverse the String
    strdecToHex.MakeReverse(); 
    
    return strdecToHex;
}

// PURPOSE OF THIS FUNCTION IS TO CHECK TO SEE IF A CHAR IS URL UNSAFE.
// TRUE = UNSAFE, FALSE = SAFE
bool CURLEncode::isUnsafe(char compareChar)
{
    bool bcharfound = false;
    char tmpsafeChar;
    int m_strLen = 0;
    
    m_strLen = csUnsafeString.GetLength();
    for(int ichar_pos = 0; ichar_pos < m_strLen ;ichar_pos++)
    {
        tmpsafeChar = csUnsafeString.GetAt(ichar_pos); 
        if(tmpsafeChar == compareChar)
        { 
            bcharfound = true;
            break;
        } 
    }
    int char_ascii_value = 0;
    //char_ascii_value = __toascii(compareChar);
    char_ascii_value = (int) compareChar;

    if(bcharfound == false &&  char_ascii_value > 32 && char_ascii_value < 123)
    {
        return false;
    }
    // found no unsafe chars, return false      
    else
    {
        return true;
    }
    
    return true;
}

// PURPOSE OF THIS FUNCTION IS TO CONVERT A STRING 
// TO URL ENCODE FORM.
CString CURLEncode::URLEncode(CString pcsEncode)
{   
    int ichar_pos;
    CString csEncode;
    CString csEncoded;  
    int m_length;
    int ascii_value;

    csEncode = pcsEncode;
    m_length = csEncode.GetLength();
    
    for(ichar_pos = 0; ichar_pos < m_length; ichar_pos++)
    {
        char ch = csEncode.GetAt(ichar_pos);
        if (ch < ' ') 
        {
            ch = ch;
        }       
        if(!isUnsafe(ch))
        {
            // Safe Character               
            csEncoded += CString(ch);
        }
        else
        {
            // get Hex Value of the Character
            csEncoded += convert(ch);
        }
    }
    

    return csEncoded;

}

CString CURLDecoder::decode(CString str) {
    int len = str.GetLength();
    char* buff = new char[len + 1];
    strcpy(buff,str);
    CString ret = "";
    for(int i=0;i<len;i++) {
        if(buff[i] == '+') {
            ret = ret + " ";
        }else if(buff[i] == '%') {
            char tmp[4];
            char hex[4];            
            hex[0] = buff[++i];
            hex[1] = buff[++i];
            hex[2] = '\0';      
            //int hex_i = atoi(hex);
            sprintf(tmp,"%c",convertToDec(hex));
            ret = ret + tmp;
        }else {
            ret = ret + buff[i];
        }
    }
    delete[] buff;
    return ret;
}

int CURLDecoder::convertToDec(const char* hex) {
    char buff[12];
    sprintf(buff,"%s",hex);
    int ret = 0;
    int len = strlen(buff);
    for(int i=0;i<len;i++) {
        char tmp[4];
        tmp[0] = buff[i];
        tmp[1] = '\0';
        getAsDec(tmp);
        int tmp_i = atoi(tmp);
        int rs = 1;
        for(int j=i;j<(len-1);j++) {
            rs *= 16;
        }
        ret += (rs * tmp_i);
    }
    return ret;
}

void CURLDecoder::getAsDec(char* hex) {
    char tmp = tolower(hex[0]);
    if(tmp == 'a') {
        strcpy(hex,"10");
    }else if(tmp == 'b') {
        strcpy(hex,"11");
    }else if(tmp == 'c') {
        strcpy(hex,"12");
    }else if(tmp == 'd') {
        strcpy(hex,"13");
    }else if(tmp == 'e') {
        strcpy(hex,"14");
    }else if(tmp == 'f') {
        strcpy(hex,"15");
    }else if(tmp == 'g') {
        strcpy(hex,"16");
    }
}