lib.utf.js

                 0x80 | ((c >>> 6) & 0x3f),
                 0x80 | (c & 0x3f));
                 }
                 else {
                 out[j] = '?';
                 }
                }
                else {
                 i--;
                 out[j] = '?';
                }
            }
            else {
                i--;
                out[j] = '?';
            }
        }
    }
    return out.join('');
}

function utf8to16(str) {
    if ((str.match(/^[x00-x7f]*$/) != null) ||
        (str.match(/^[x00-xff]*$/) == null)) {
        return str;
    }
    var out, i, j, len, c, c2, c3, c4, s;

    out = [];
    len = str.length;
    i = j = 0;
    while (i < len) {
        c = str.charCodeAt(i++);
        switch (c >> 4) {
            case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
            // 0xxx xxxx
out[j++] = str.charAt(i - 1);
            break;
            case 12: case 13:
            // 110x xxxx 10xx xxxx
c2 = str.charCodeAt(i++);
            out[j++] = String.fromCharCode(((c & 0x1f) << 6) |