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URLEncode

, 25 Jun 2001
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Convert string using URLEncode method
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URLEncode

I use this functions to prepare POST strings with XML data. The first function URLEncode1 uses less memory but is slower than the second URLEncode2. Both functions return a CString and get a CString as the input parameter.

The demo project contains sample usage with execution time of presented functions.

Source

Helper function

inline BYTE toHex(const BYTE &x)
{
	return x > 9 ? x + 55: x + 48;
}

URLEncode1

CString URLEncode1(CString sIn)
{
    CString sOut;
	
    int k;
    const int nLen = sIn.GetLength() + 1;

    register LPBYTE pOutTmp = NULL;
    LPBYTE pOutBuf = NULL;
    register LPBYTE pInTmp = NULL;
    LPBYTE pInBuf =(LPBYTE)sIn.GetBuffer(nLen);
    BYTE b = 0;

    //count not alphanumeric characters
    k = 0;
	
    pInTmp = pInBuf;
    while(*pInTmp)
    {
        if (!isalnum(*pInTmp) && !isalnum(*pInTmp))
            k++;
        pInTmp++;
    }

    //alloc out buffer
    pOutBuf = (LPBYTE)sOut.GetBuffer(nLen  + 2 * k); //new BYTE [nLen  + 3 * k];

    if(pOutBuf)
    {
        pInTmp	= pInBuf;
	pOutTmp = pOutBuf;
		
	// do encoding
	while (*pInTmp)
        {
	    if(isalnum(*pInTmp))
                *pOutTmp++ = *pInTmp;
	    else
		if(isspace(*pInTmp))
		    *pOutTmp++ = '+';
		else
		{
		    *pOutTmp++ = '%';
		    *pOutTmp++ = toHex(*pInTmp>>4);
		     *pOutTmp++ = toHex(*pInTmp%16);
		}
	    pInTmp++;
	}
	
	*pOutTmp = '\0';
	//sOut=pOutBuf;
	//delete [] pOutBuf;
	sOut.ReleaseBuffer();
    }
    sIn.ReleaseBuffer();
    return sOut;
}

URLEncode2

CString URLEncode2(CString sIn)
{
    CString sOut;
	
    const int nLen = sIn.GetLength() + 1;

    register LPBYTE pOutTmp = NULL;
    LPBYTE pOutBuf = NULL;
    register LPBYTE pInTmp = NULL;
    LPBYTE pInBuf =(LPBYTE)sIn.GetBuffer(nLen);
    BYTE b = 0;
	
    //alloc out buffer
    pOutBuf = (LPBYTE)sOut.GetBuffer(nLen  * 3 - 2);//new BYTE [nLen  * 3];

    if(pOutBuf)
    {
        pInTmp	= pInBuf;
	pOutTmp = pOutBuf;
		
	// do encoding
	while (*pInTmp)
	{
	    if(isalnum(*pInTmp))
	        *pOutTmp++ = *pInTmp;
	    else
	        if(isspace(*pInTmp))
		    *pOutTmp++ = '+';
		else
		{
		    *pOutTmp++ = '%';
		    *pOutTmp++ = toHex(*pInTmp>>4);
		    *pOutTmp++ = toHex(*pInTmp%16);
		}
	    pInTmp++;
	}
	*pOutTmp = '\0';
	//sOut=pOutBuf;
	//delete [] pOutBuf;
	sOut.ReleaseBuffer();
    }
    sIn.ReleaseBuffer();
    return sOut;
}

Modifications

26.06.2001 - changed out buffer memory allocation (thx 2 Marc Brooks and Matthias)

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here

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About the Author

Ryszard Krakowiak
Web Developer
Poland Poland
No Biography provided

Comments and Discussions

 
GeneralUnicode solution Pinmemberangelo moscati4-Jul-05 3:41 
GeneralRe: Unicode solution Pinmemberangelo moscati4-Jul-05 5:24 

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