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URLEncode

By , 25 Jun 2001
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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

About the Author

Ryszard Krakowiak
Web Developer
Poland Poland
No Biography provided

Comments and Discussions

 
QuestionThis is slightly broke, and to clear up some confussion [modified] PinmemberKevinSW21-Sep-12 1:35 
GeneralHere's a much simpler method that supports Unicode Pinmemberdc_200025-Apr-11 0:59 
Questionwtf is "if (!isalnum(*pInTmp) && !isalnum(*pInTmp))" ? Pinmembers98769026-Jul-07 23:34 
GeneralURLEncode2() Unicode version Pinmembermcanti2-May-06 2:28 
GeneralUnicode solution Pinmemberangelo moscati4-Jul-05 3:41 
GeneralRe: Unicode solution Pinmemberangelo moscati4-Jul-05 5:24 
GeneralNot support UNICODE Pinmemberchinkuanyeh10-Oct-04 21:28 
GeneralCR LF support Pinmemberlittle.mole3-Jul-04 10:29 
Questionmistake? Pinmember3m2u16-Mar-04 23:02 
Questionhow to converts a string that has been encoded for transmission in a URL into a decoded string? Pinmemberrafaelcn24-Mar-03 6:25 
AnswerRe: how to converts a string that has been encoded for transmission in a URL into a decoded string? Pinmemberlittle.mole3-Jul-04 11:23 
QuestionUnicode? PinmemberAlexMarbus6-Nov-02 3:11 
Generalnot portable Pinmemberpamela7-Oct-01 2:42 
GeneralRe: not portable PinsussAnonymous17-May-03 9:15 
QuestionHow to add a dialog before Windows's explore working PinmemberNewLearnXZX12-Jul-01 14:48 
GeneralWindows already does (most) of this, methinks... PinmemberArnt Witteveen4-Jul-01 0:57 
GeneralRe: Windows already does (most) of this, methinks... PinmemberRyszard Krakowiak9-Jul-01 4:35 
GeneralRe: Windows already does (most) of this, methinks... Pinmemberwangjj23-Jul-01 15:29 
GeneralRe: Windows already does (most) of this, methinks... PinsussAnonymous29-Aug-02 1:29 
GeneralMinor correction in UrlEncode1 PinmemberMarc Brooks25-Jun-01 18:14 
GeneralGetBuffer instead of new PinmemberAnonymous25-Jun-01 5:08 
GeneralGetBuffer instead of new PinmemberAnonymous25-Jun-01 5:08 
GeneralRe: GetBuffer instead of new PinmemberWictor Wilén1-Aug-01 10:59 

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