added simple method for wrapping serial data in SLIP packets

tools/cooja/java/se/sics/cooja/plugins/SLIP.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2009, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $Id: SLIP.java,v 1.1 2009/01/15 13:13:47 fros4943 Exp $
+ */
+
+package se.sics.cooja.plugins;
+
+import java.util.ArrayList;
+
+import org.apache.log4j.Logger;
+
+public class SLIP {
+  private static Logger logger = Logger.getLogger(SLIP.class);
+
+  private final static byte SLIP_END = (byte)0300;
+  private final static byte SLIP_ESC = (byte)0333;
+  private final static byte SLIP_ESC_END = (byte)0334;
+  private final static byte SLIP_ESC_ESC = (byte)0335;
+
+  /**
+   * Wraps packet as SLIP.
+   *
+   * @param packet Packet data
+   */
+  public static byte[] asSlip(byte[] packet) {
+    ArrayList<Byte> bytes = new ArrayList<Byte>();
+
+    bytes.add(SLIP_END);
+
+    for (byte b: packet) {
+      if (b == SLIP_END) {
+        bytes.add(SLIP_ESC);
+        bytes.add(SLIP_ESC_END);
+      } else if (b == SLIP_ESC) {
+        bytes.add(SLIP_ESC);
+        bytes.add(SLIP_ESC_ESC);
+      } else {
+        bytes.add(b);
+      }
+    }
+
+    bytes.add(SLIP_END);
+
+    byte[] arr = new byte[bytes.size()];
+    for (int i=0; i < bytes.size(); i++) {
+      arr[i] = (bytes.get(i)).byteValue();
+    }
+    return arr;
+  }
+}