TransformicePacket.java

package com.nanomice.nanomice;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;

/**
 *
 * @author Ruslan Devsaider <me@devsaider.ru>
 */
public class TransformicePacket {
    public ByteArrayOutputStream rawb = new ByteArrayOutputStream();
    public DataOutputStream b = new DataOutputStream(rawb);
    public final int CC;
    public final int C;

    private static final int[] SECRET_KEY = {19, 41, 50, 15, 47, 56, 5, 49, 33, 36, 109, 72, 112, 109, 86, 116, 97, 98, 88, 74};

    public TransformicePacket(int C, int CC) throws IOException {
        this.C = C;
        this.CC = CC;
        this.b.writeByte(C);
        this.b.writeByte(CC);
    }

    static DataInputStream decode(int fingerprint, DataInputStream dis) throws IOException {
        ByteArrayOutputStream rawnewdis = new ByteArrayOutputStream();
        DataOutputStream newdis = new DataOutputStream(rawnewdis);
        while (dis.available() > 0) {
            fingerprint = (fingerprint + 1) % SECRET_KEY.length;
            newdis.write(dis.readByte() ^ SECRET_KEY[fingerprint]);
        }
        return new DataInputStream(new ByteArrayInputStream(rawnewdis.toByteArray()));
    }
}