// JScript 文件

function URLEncode(plaintext)
{
    // The Javascript escape and unescape functions do not correspond 
    // with what browsers actually do... 
    var SAFECHARS = "0123456789" + // Numeric 
        "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + // Alphabetci 
        "abcdefghijklmnopqrstuvwxyz" + 
        "-_.!~*'()"; // RFC2396 Mark characters 
    var HEX = "0123456789ABCDEF";
    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(encoded)
{
    // Replace + with ' '
    // Replace %xx with equivalent character
    var plaintext = "";
    var i = 0;
    while (i < (encoded.length-2)) {
        var ch = encoded.charAt(i);
        if (ch == "+") {
            plaintext += " "; i++;
        }
        else if (ch == "%" && encoded.charAt(i+1) != "%") {
            plaintext += unescape( encoded.substr(i,3) );
            i += 3;
        }
        else {
            plaintext += ch;
            i++;
        }
   } // while
   if (i < encoded.length) {
        plaintext += encoded.substr(i,encoded.length-i);
   }
   return unescape(plaintext);
}

var keyStr = "ABCDEFGHIJKLMNOP" +
"QRSTUVWXYZabcdef" +
"ghijklmnopqrstuv" +
"wxyz0123456789+/" +
"=";
function Encode64(input) {
input = escape(input);
var output = "";
var chr1, chr2, chr3 = "";
var enc1, enc2, enc3, enc4 = "";
var i = 0;
do {
chr1 = input.charCodeAt(i++);
chr2 = input.charCodeAt(i++);
chr3 = input.charCodeAt(i++);
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output + 
keyStr.charAt(enc1) + 
keyStr.charAt(enc2) + 
keyStr.charAt(enc3) + 
keyStr.charAt(enc4);
chr1 = chr2 = chr3 = "";
enc1 = enc2 = enc3 = enc4 = "";

} while (i < input.length);

return output;

}

function Decode64(input) {
var output = "";
var chr1, chr2, chr3 = "";
var enc1, enc2, enc3, enc4 = "";
var i = 0;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
var base64test = /[^A-Za-z0-9\+\/\=]/g;
if (base64test.exec(input)) {
alert("There were invalid base64 characters in the input text.\n" +
"Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +
"EXPect errors in decoding.");
}

input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
do {
enc1 = keyStr.indexOf(input.charAt(i++));
enc2 = keyStr.indexOf(input.charAt(i++));
enc3 = keyStr.indexOf(input.charAt(i++));
enc4 = keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 != 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 != 64) {
output = output + String.fromCharCode(chr3);
}
chr1 = chr2 = chr3 = "";
enc1 = enc2 = enc3 = enc4 = "";
} while (i < input.length);
return unescape(output);
}