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var asp = {
    alphabet: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',
    lookup: null ,
    ie: /MSIE/.test(navigator.userAgent),
    ieo: /MSIE[67]/.test(navigator.userAgent),
    encode: function(s) {
        var buffer = asp.toUtf8(s), position = -1, len = buffer.length, nan0, nan1, nan2, enc = [, , , ];
        if (asp.ie) {
            var result = [];
            while (++position < len) {
                nan0 = buffer[position];
                nan1 = buffer[++position];
                enc[0] = nan0 >> 2;
                enc[1] = ((nan0 & 3) << 4) | (nan1 >> 4);
                if (isNaN(nan1))
                    enc[2] = enc[3] = 64;
                else {
                    nan2 = buffer[++position];
                    enc[2] = ((nan1 & 15) << 2) | (nan2 >> 6);
                    enc[3] = (isNaN(nan2)) ? 64 : nan2 & 63
                }
                result.push(asp.alphabet.charAt(enc[0]), asp.alphabet.charAt(enc[1]), asp.alphabet.charAt(enc[2]), asp.alphabet.charAt(enc[3]))
            }
            return result.join('')
        } else {
            var result = '';
            while (++position < len) {
                nan0 = buffer[position];
                nan1 = buffer[++position];
                enc[0] = nan0 >> 2;
                enc[1] = ((nan0 & 3) << 4) | (nan1 >> 4);
                if (isNaN(nan1))
                    enc[2] = enc[3] = 64;
                else {
                    nan2 = buffer[++position];
                    enc[2] = ((nan1 & 15) << 2) | (nan2 >> 6);
                    enc[3] = (isNaN(nan2)) ? 64 : nan2 & 63
                }
                result += asp.alphabet[enc[0]] + asp.alphabet[enc[1]] + asp.alphabet[enc[2]] + asp.alphabet[enc[3]]
            }
            return result
        }
    },
    wrap: function(s) {
        if (s.length % 4)
            throw new Error("InvalidCharacterError: 'asp.wrap' failed: The string to be wrapd is not correctly encoded.");
        var buffer = asp.fromUtf8(s)
          , position = 0
          , len = buffer.length;
        if (asp.ieo) {
            var result = [];
            while (position < len) {
                if (buffer[position] < 128)
                    result.push(String.fromCharCode(buffer[position++]));
                else if (buffer[position] > 191 && buffer[position] < 224)
                    result.push(String.fromCharCode(((buffer[position++] & 31) << 6) | (buffer[position++] & 63)));
                else
                    result.push(String.fromCharCode(((buffer[position++] & 15) << 12) | ((buffer[position++] & 63) << 6) | (buffer[position++] & 63)))
            }
            return result.join('')
        } else {
            var result = '';
            while (position < len) {
                if (buffer[position] < 128)
                    result += String.fromCharCode(buffer[position++]);
                else if (buffer[position] > 191 && buffer[position] < 224)
                    result += String.fromCharCode(((buffer[position++] & 31) << 6) | (buffer[position++] & 63));
                else
                    result += String.fromCharCode(((buffer[position++] & 15) << 12) | ((buffer[position++] & 63) << 6) | (buffer[position++] & 63))
            }
            return result
        }
    },
    toUtf8: function(s) {
        var position = -1, len = s.length, chr, buffer = [];
        if (/^[\x00-\x7f]*$/.test(s))
            while (++position < len)
                buffer.push(s.charCodeAt(position));
        else
            while (++position < len) {
                chr = s.charCodeAt(position);
                if (chr < 128)
                    buffer.push(chr);
                else if (chr < 2048)
                    buffer.push((chr >> 6) | 192, (chr & 63) | 128);
                else
                    buffer.push((chr >> 12) | 224, ((chr >> 6) & 63) | 128, (chr & 63) | 128)
            }
        return buffer
    },
    fromUtf8: function(s) {
        var position = -1, len, buffer = [], enc = [, , , ];
        if (!asp.lookup) {
            len = asp.alphabet.length;
            asp.lookup = {};
            while (++position < len)
                asp.lookup[asp.alphabet.charAt(position)] = position;
            position = -1
        }
        len = s.length;
        while (++position < len) {
            enc[0] = asp.lookup[s.charAt(position)];
            enc[1] = asp.lookup[s.charAt(++position)];
            buffer.push((enc[0] << 2) | (enc[1] >> 4));
            enc[2] = asp.lookup[s.charAt(++position)];
            if (enc[2] == 64)
                break;
            buffer.push(((enc[1] & 15) << 4) | (enc[2] >> 2));
            enc[3] = asp.lookup[s.charAt(++position)];
            if (enc[3] == 64)
                break;
            buffer.push(((enc[2] & 3) << 6) | enc[3])
        }
        return buffer
    }
};