/* ====================================================================
*       URLEncode and URLDecode functions
*
* Copyright Albion Research Ltd. 2002
* http://www.albionresearch.com/
*
* Modifed by Jeremiah LaBresh
* ====================================================================
* 
*/

 
function URLEncode(strDecoded)
{
	/* The Javascript escape and unescape functions do not correspond
	 * with what browsers actually do...
	 */ 
	var SAFECHARS = "0123456789" +					/* Numeric */
					"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +	/* Alphabetic */
					"abcdefghijklmnopqrstuvwxyz" +
					"-_.!~*'()";					/* RFC2396 Mark characters*/
	var HEX = "0123456789ABCDEF";

	var plaintext = strDecoded;
	var encoded = "";
	for (var i = 0; i < plaintext.length; i++ ) {
		var ch = plaintext.charAt(i);
	    if (ch == " ") {
		    encoded += "+";				/* x-www-urlencoded, rather than %20*/
		} else if (SAFECHARS.indexOf(ch) != -1) {
		    encoded += ch;
		} else {
		    var charCode = ch.charCodeAt(0);
			if (charCode > 255) {
			    alert( "Unicode Character '" 
                        + ch 
                        + "' cannot be encoded using standard URL encoding.\n" +
				          "(URL encoding only supports 8-bit characters.)\n" +
						  "A space (+) will be substituted." );
				encoded += "+";
			} else {
				encoded += "%";
				encoded += HEX.charAt((charCode >> 4) & 0xF);
				encoded += HEX.charAt(charCode & 0xF);
			}
		}
	} /* for */

	return encoded;
};

function URLDecode(strEncoded)
{
   /* Replace + with ' '
    * Replace %xx with equivalent character
    * Put [ERROR] in output if %xx is invalid.
    */
   var HEXCHARS = "0123456789ABCDEFabcdef"; 
   var encoded = strEncoded;
   var plaintext = "";
   var i = 0;
   while (i < encoded.length) {
       var ch = encoded.charAt(i);
	   if (ch == "+") {
	       plaintext += " ";
		   i++;
	   } else if (ch == "%") {
			if (i < (encoded.length-2) 
					&& HEXCHARS.indexOf(encoded.charAt(i+1)) != -1 
					&& HEXCHARS.indexOf(encoded.charAt(i+2)) != -1 ) {
				plaintext += unescape( encoded.substr(i,3) );
				i += 3;
			} else {
				alert( 'Bad escape combination near ...' + encoded.substr(i) );
				plaintext += "%[ERROR]";
				i++;
			}
		} else {
		   plaintext += ch;
		   i++;
		}
	} /* while */

   return plaintext;
};