Titanium Filesystem.write() file encoding always UTF8

Hi i want to create a simple pdf file with spanish characters like: á é í ó ú.

The encoding for the pdf must be WinAnsiEncoding or MacRomanEncoding (Iso-LATIN 1)

The function write() of Ti.Filesystem always creates a file with utf8 encoding regardles of the encoding of the string i use (converted with TI.codec).

If i open the pdf in notepad++ the encoding is always UTF8 and the characters are broken, if i tranform the encoding to ANSI using notrepad++ the pdf file shows the correct characters.

My question is how to force the encoding in the write() function?

In androids java i can use:

OutputStreamWriter osw = new OutputStreamWriter(
                        new FileOutputStream(file), "MacRoman");

var doc = require('jspdf_old');
 
 
doc.jsPDF();
 
 doc.text(20, 20, 'hello, I am PDF.');
 
 doc.text(20, 30, 'i was created in the browser using javascript.');
 
 doc.text(20, 40, 'o = ó    a = á   e = é   i= í   u = ú   ');
 
var res;
 
res = doc.output();
 
var buffer = Ti.createBuffer({ length: 5000 });
 
var length = Ti.Codec.encodeString({
    source: res,
    dest: buffer,
    charset: Ti.Codec.CHARSET_ISO_LATIN_1
});
buffer.length = length;
var string = Ti.Codec.decodeString({
  source: buffer,
  charset: Ti.Codec.CHARSET_ISO_LATIN_1
});
 
Ti.API.info(string);
 
  if(Ti.Filesystem.isExternalStoragePresent()){
     var file = Ti.Filesystem.getFile(Ti.Filesystem.externalStorageDirectory,'test.pdf');
   }
 
 
   else {
     var file = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, 'test.pdf');
   }
 file.write(string);
 
   if(file.exists) {
     Ti.API.info('[saveFile] Saved: YES! (' + file.nativePath + ')');
   } else {
     Ti.API.info('[saveFile] Saved: NO!');
   }