common/src/main/java/com/genexus/util/Codecs.java
/**
     * Translates a string into <code>application/x-www-form-urlencoded</code>
     * format using a specific encoding scheme. This method uses the
     * supplied encoding scheme to obtain the bytes for unsafe
     * characters.
     * <p>
     * <em><strong>Note:</strong> The <a href=
     * "http://www.w3.org/TR/html40/appendix/notes.html#non-ascii-chars">
     * World Wide Web Consortium Recommendation</a> states that
     * UTF-8 should be used. Not doing so may introduce
     * incompatibilites.</em>
     *
     * @param   s   <code>String</code> to be translated.
     * @param   enc   The name of a supported
     *    <a href="../lang/package-summary.html#charenc">character
     *    encoding</a>.
     * @return  the translated <code>String</code>.
     * @exception  UnsupportedEncodingException
     *             If the named encoding is not supported
     * @see URLDecoder#decode(java.lang.String, java.lang.String)
     * @since 1.4
     */
Translates a string into application/x-www-form-urlencoded
format using a specific encoding scheme. This method uses the
supplied encoding scheme to obtain the bytes for unsafe
characters.

Note: The 
World Wide Web Consortium Recommendation states that
UTF-8 should be used. Not doing so may introduce
incompatibilites.

@param   s   String to be translated.
@param   enc   The name of a supported
character
encoding.
@return  the translated String.
Translates a string into application / x - www - form - urlencoded format using a specific encoding scheme . This method uses the supplied encoding scheme to obtain the bytes for unsafe characters . Note : The World Wide Web Consortium Recommendation states that UTF - 8 should be used . Not doing so may introduce incompatibilites . @param s String to be translated . @param enc The name of a supported character encoding . @return the translated String .
public static String encode(String s, String enc)
	throws UnsupportedEncodingException {
	boolean needToChange = false;
	boolean wroteUnencodedChar = false;
	int maxBytesPerChar = 10; 
        StringBuffer out = new StringBuffer(s.length());
	ByteArrayOutputStream buf = new ByteArrayOutputStream(maxBytesPerChar);
	OutputStreamWriter writer = new OutputStreamWriter(buf, enc);
	for (int i = 0; i < s.length(); i++) {
	    int c = (int) s.charAt(i);
	    if (dontNeedEncoding.get(c)) {
		if (c == ' ') {
		    c = '+';
		    needToChange = true;
		}
		out.append((char)c);
		wroteUnencodedChar = true;
	    } else {
		try {
		    if (wroteUnencodedChar) { 
		    	writer = new OutputStreamWriter(buf, enc);
			wroteUnencodedChar = false;
		    }
		    writer.write(c);
		    /*
		     * If this character represents the start of a Unicode
		     * surrogate pair, then pass in two characters. It's not
		     * clear what should be done if a bytes reserved in the
		     * surrogate pairs range occurs outside of a legal
		     * surrogate pair. For now, just treat it as if it were
		     * any other character.
		     */
		    if (c >= 0xD800 && c <= 0xDBFF) {
			/*
			  System.out.println(Integer.toHexString(c)
			  + " is high surrogate");
			*/
			if ( (i+1) < s.length()) {
			    int d = (int) s.charAt(i+1);
			    /*
			      System.out.println("\tExamining "
			      + Integer.toHexString(d));
			    */
			    if (d >= 0xDC00 && d <= 0xDFFF) {
				/*
				  System.out.println("\t"
				  + Integer.toHexString(d)
				  + " is low surrogate");
				*/
				writer.write(d);
				i++;
			    }
			}
		    }
		    writer.flush();
		} catch(IOException e) {
		    buf.reset();
		    continue;
		}
		byte[] ba = buf.toByteArray();
		for (int j = 0; j < ba.length; j++) {
		    out.append('%');
		    char ch = Character.forDigit((ba[j] >> 4) & 0xF, 16);
		    if (Character.isLetter(ch)) {
			ch -= caseDiff;
		    }
		    out.append(ch);
		    ch = Character.forDigit(ba[j] & 0xF, 16);
		    if (Character.isLetter(ch)) {
			ch -= caseDiff;
		    }
		    out.append(ch);
		}
		buf.reset();
		needToChange = true;
	    }
	}
	return (needToChange? out.toString() : s);
	}
public static String encode ( String s , String enc ) throws UnsupportedEncodingException { boolean needToChange = false ; boolean wroteUnencodedChar = false ; int maxBytesPerChar = 10 ; StringBuffer out = new StringBuffer ( s . length ( ) ) ; ByteArrayOutputStream buf = new ByteArrayOutputStream ( maxBytesPerChar ) ; OutputStreamWriter writer = new OutputStreamWriter ( buf , enc ) ; for ( int i = 0 ; i < s . length ( ) ; i ++ ) { int c = ( int ) s . charAt ( i ) ; if ( dontNeedEncoding . get ( c ) ) { if ( c == ' ' ) { c = '+' ; needToChange = true ; } out . append ( ( char ) c ) ; wroteUnencodedChar = true ; } else { try { if ( wroteUnencodedChar ) { writer = new OutputStreamWriter ( buf , enc ) ; wroteUnencodedChar = false ; } writer . write ( c ) ; /*
		     * If this character represents the start of a Unicode
		     * surrogate pair, then pass in two characters. It's not
		     * clear what should be done if a bytes reserved in the
		     * surrogate pairs range occurs outside of a legal
		     * surrogate pair. For now, just treat it as if it were
		     * any other character.
		     */ if ( c >= 0xD800 && c <= 0xDBFF ) { /*
			  System.out.println(Integer.toHexString(c)
			  + " is high surrogate");
			*/ if ( ( i + 1 ) < s . length ( ) ) { int d = ( int ) s . charAt ( i + 1 ) ; /*
			      System.out.println("\tExamining "
			      + Integer.toHexString(d));
			    */ if ( d >= 0xDC00 && d <= 0xDFFF ) { /*
				  System.out.println("\t"
				  + Integer.toHexString(d)
				  + " is low surrogate");
				*/ writer . write ( d ) ; i ++ ; } } } writer . flush ( ) ; } catch ( IOException e ) { buf . reset ( ) ; continue ; } byte [ ] ba = buf . toByteArray ( ) ; for ( int j = 0 ; j < ba . length ; j ++ ) { out . append ( '%' ) ; char ch = Character . forDigit ( ( ba [ j ] >> 4 ) & 0xF , 16 ) ; if ( Character . isLetter ( ch ) ) { ch -= caseDiff ; } out . append ( ch ) ; ch = Character . forDigit ( ba [ j ] & 0xF , 16 ) ; if ( Character . isLetter ( ch ) ) { ch -= caseDiff ; } out . append ( ch ) ; } buf . reset ( ) ; needToChange = true ; } } return ( needToChange ? out . toString ( ) : s ) ; }
Translates a string into <code>application/x-www-form-urlencoded</code>
 format using a specific encoding scheme.
Translates a string into <code > application / x - www - form - urlencoded< / code > format using a specific encoding scheme .
// rather arbitrary limit, but safe for now //System.out.println("Examining character: " + c); //System.out.println("Storing: " + c); // convert to external encoding before hex conversion // Fix for 4407610 // converting to use uppercase letter as part of // the hex value if ch is a letter.