ReplacingInputStream.java

public class ReplacingInputStream extends FilterInputStream
public ReplacingInputStream(InputStream in) {
    super(in);
    this.in = in;
}
public int read() throws IOException {
    int read = super.read();
    if (read!=-1 && read<0x20 && !(read==0x9 || read==0xA || read==0xB))
    { read = 0x20;}
    return read;
}
}