Use OpenCSV to convert CSV file in XML File using byte[] in input

I have a question:

I'm trying to convert my CSV file to XML file and I'm seeing the response of this post: Java lib or app to convert CSV to XML file?

I see that I need use this OpenCSV library and in particular, I must use this code:

CSVReader reader = new CSVReader(new FileReader(startFile));

where String startFile = "./startData.csv";

Now, I don't get a String as startFile, but I have a byte[] because, for other question, I have convert my file in byte[]. How can I use this code with byte[]?

Are there alternatives?

Thanks