public String detectFileCharset(File file) throws FileNotFoundException, IOException {
detector.Init(
new nsICharsetDetectionObserver() {
@Override
public void Notify(String arg0) {
found = true;
charset = arg0;
}
});
byte[] buffer = new byte[2048];
int length;
BufferedInputStream stream = new BufferedInputStream(new FileInputStream(file));
boolean done = false;
boolean isAscii = true;
while ((length = stream.read(buffer, 0, buffer.length)) != -1) {
if (isAscii) {
isAscii = detector.isAscii(buffer, length);
}
if (!isAscii && !done) {
done = detector.DoIt(buffer, length, false);
}
}
detector.DataEnd();
stream.close();
if (isAscii) {
charset = "us-ascii";
found = true;
}
if (!found) {
return null;
}
return charset;
}
