var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

var base64DecodeChars = new Array(

    -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -,

    -, -, -, -, -, -, -, -, -, -, -, -, -, -, -, -,

    -, -, -, -, -, -, -, -, -, -, -, , -, -, -, ,

    , , , , , , , , , , -, -, -, -, -, -,

    -,  ,  ,  ,  ,  ,  ,  ,  ,  ,  , , , , , ,

    , , , , , , , , , , , -, -, -, -, -,

    -, , , , , , , , , , , , , , , ,

    , , , , , , , , , , , -, -, -, -, -);

function base64encode(str) {

    var out, i, len;

    var c1, c2, c3;

    len = str.length;

    i = ;

    out = "";

    while(i < len) {

    c1 = str.charCodeAt(i++) & 0xff;

    if(i == len)

    {

        out += base64EncodeChars.charAt(c1 >> );

        out += base64EncodeChars.charAt((c1 & 0x3) << );

        out += "==";

        break;

    }

    c2 = str.charCodeAt(i++);

    if(i == len)

    {

        out += base64EncodeChars.charAt(c1 >> );

        out += base64EncodeChars.charAt(((c1 & 0x3)<< ) | ((c2 & 0xF0) >> ));

        out += base64EncodeChars.charAt((c2 & 0xF) << );

        out += "=";

        break;

    }

    c3 = str.charCodeAt(i++);

    out += base64EncodeChars.charAt(c1 >> );

    out += base64EncodeChars.charAt(((c1 & 0x3)<< ) | ((c2 & 0xF0) >> ));

    out += base64EncodeChars.charAt(((c2 & 0xF) << ) | ((c3 & 0xC0) >>));

    out += base64EncodeChars.charAt(c3 & 0x3F);

    }

    return out;

}

function base64decode(str) {

    var c1, c2, c3, c4;

    var i, len, out;

    len = str.length;

    i = ;

    out = "";

    while(i < len) {

    /* c1 */

    do {

        c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];

    } while(i < len && c1 == -);

    if(c1 == -)

        break;

    /* c2 */

    do {

        c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];

    } while(i < len && c2 == -);

    if(c2 == -)

        break;

    out += String.fromCharCode((c1 << ) | ((c2 & 0x30) >> ));

    /* c3 */

    do {

        c3 = str.charCodeAt(i++) & 0xff;

        if(c3 == )

        return out;

        c3 = base64DecodeChars[c3];

    } while(i < len && c3 == -);

    if(c3 == -)

        break;

    out += String.fromCharCode(((c2 & 0XF) << ) | ((c3 & 0x3C) >> ));

    /* c4 */

    do {

        c4 = str.charCodeAt(i++) & 0xff;

        if(c4 == )

        return out;

        c4 = base64DecodeChars[c4];

    } while(i < len && c4 == -);

    if(c4 == -)

        break;

    out += String.fromCharCode(((c3 & 0x03) << ) | c4);

    }

    return out;

}

function utf16to8(str) {

    var out, i, len, c;

    out = "";

    len = str.length;

    for(i = ; i < len; i++) {

    c = str.charCodeAt(i);

    if ((c >= 0x0001) && (c <= 0x007F)) {

        out += str.charAt(i);

    } else if (c > 0x07FF) {

        out += String.fromCharCode(0xE0 | ((c >> ) & 0x0F));

        out += String.fromCharCode(0x80 | ((c >>  ) & 0x3F));

        out += String.fromCharCode(0x80 | ((c >>  ) & 0x3F));

    } else {

        out += String.fromCharCode(0xC0 | ((c >>  ) & 0x1F));

        out += String.fromCharCode(0x80 | ((c >>  ) & 0x3F));

    }

    }

    return out;

}

function utf8to16(str) {

    var out, i, len, c;

    var char2, char3;

    out = "";

    len = str.length;

    i = ;

    while(i < len) {

    c = str.charCodeAt(i++);

    switch(c >> )

    {

      case : case : case : case : case : case : case : case :

        // 0xxxxxxx

        out += str.charAt(i-);

        break;

      case : case :

        // 110x xxxx   10xx xxxx

        char2 = str.charCodeAt(i++);

        out += String.fromCharCode(((c & 0x1F) << ) | (char2 & 0x3F));

        break;

      case :

        // 1110 xxxx  10xx xxxx  10xx xxxx

        char2 = str.charCodeAt(i++);

        char3 = str.charCodeAt(i++);

        out += String.fromCharCode(((c & 0x0F) << ) |

                       ((char2 & 0x3F) << ) |

                       ((char3 & 0x3F) << ));

        break;

    }

    }

    return out;

}

function CharToHex(str) {

    var out, i, len, c, h;

    out = "";

    len = str.length;

    i = ;

    while(i < len)

    {

        c = str.charCodeAt(i++);

        h = c.toString();

        if(h.length < )

            h = "" + h;

        out += "\\x" + h + " ";

        if(i >  && i %  == )

            out += "\r\n";

    }

    return out;

}

function doEncode() {

    var src = document.getElementById('src').value;

    document.getElementById('dest').value = base64encode(utf16to8(src));    //调用这里加密

}

function doDecode() {

    var src = document.getElementById('src').value;

    var opts = document.getElementById('opt');

    if(opts.checked)

    {

        document.getElementById('dest').value = CharToHex(base64decode(src));   //调用这里解密

    }

    else

    {

        document.getElementById('dest').value = utf8to16(base64decode(src));

    }

}

//window.BASE64 = __BASE64;

function ss(){

    return '';

}