InputStreamReader buffering issue

Question

I am reading data from a file that has, unfortunately, two types of character encoding.

There is a header and a body. The header is always in ASCII and defines the char

Answer 1

If you wrap the InputStream and limit all reads to just 1 byte at a time, it seems to disable the buffering inside of InputStreamReader.

This way we don't have to rewrite the InputStreamReader logic.

public class OneByteReadInputStream extends InputStream
{
    private final InputStream inputStream;

    public OneByteReadInputStream(InputStream inputStream)
    {
        this.inputStream = inputStream;
    }

    @Override
    public int read() throws IOException
    {
        return inputStream.read();
    }

    @Override
    public int read(byte[] b, int off, int len) throws IOException
    {
        return super.read(b, off, 1);
    }
}

To construct:

new InputStreamReader(new OneByteReadInputStream(inputStream));