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var binary = require('./binary');
/*** encode
converts a Unicode character string into a UTF-8
character stream.
*/
exports.encode = function (string) {
string = string.replace(/\r\n/g,"\n");
var utftext = [];
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext.push(c);
}
else if((c > 127) && (c < 2048)) {
utftext.push((c >> 6) | 192);
utftext.push((c & 63) | 128);
}
else {
utftext.push((c >> 12) | 224);
utftext.push(((c >> 6) & 63) | 128);
utftext.push((c & 63) | 128);
}
}
return binary.ByteString(utftext);
};
/*** decode
Converts a UTF-8 character string into a
Unicode character string.
*/
exports.decode = function (utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;
while (i < utftext.length) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
} else if ((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i+1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
} else {
c2 = utftext.charCodeAt(i+1);
c3 = utftext.charCodeAt(i+2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
};
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