Added XOR Scrambler for Brew data

Very fast obfuscator for brew data so that a client cant easily read it

src/com/dre/brewery/lore/XORScrambleStream.java

@@ -0,0 +1,67 @@
+package com.dre.brewery.lore;
+
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.util.Random;
+
+public class XORScrambleStream extends FilterOutputStream {
+
+	private final long seed;
+	private SeedInputStream xorStream;
+	private boolean running;
+
+	public XORScrambleStream(OutputStream out, long seed) {
+		super(out);
+		this.seed = seed;
+	}
+
+	public void start() throws IOException {
+		running = true;
+		if (xorStream == null) {
+			short id = 0;
+			while (id == 0) {
+				id = (short) new Random().nextInt();
+			}
+			xorStream = new SeedInputStream(seed ^ id);
+			out.write((byte) (id >> 8));
+			out.write((byte) id);
+		}
+	}
+
+	public void stop() {
+		running = false;
+	}
+
+	@Override
+	public void write(int b) throws IOException {
+		if (!running) {
+			out.write(b);
+			return;
+		}
+		out.write(b ^ xorStream.read());
+	}
+
+	@Override
+	public void write(byte[] b, int off, int len) throws IOException {
+		if (!running) {
+			out.write(b, off, len);
+			return;
+		}
+		byte[] xored = new byte[len];
+		xorStream.read(xored);
+		int j = off;
+		for (int i = 0; i < len; i++) {
+			xored[i] ^= b[j++];
+		}
+		out.write(xored);
+	}
+
+	@Override
+	public void close() throws IOException {
+		running = false;
+		xorStream = null;
+		super.close();
+	}
+}