[Mspsim-commit] SF.net SVN: mspsim:[418] mspsim/se/sics/mspsim/util/CCITT_CRC.java

[<jo...@us...>]

Revision: 418
          http://mspsim.svn.sourceforge.net/mspsim/?rev=418&view=rev
Author:   joxe
Date:     2008-11-09 20:05:53 +0000 (Sun, 09 Nov 2008)

Log Message:
-----------
added CRC class

Added Paths:
-----------
    mspsim/se/sics/mspsim/util/CCITT_CRC.java

Added: mspsim/se/sics/mspsim/util/CCITT_CRC.java
===================================================================
--- mspsim/se/sics/mspsim/util/CCITT_CRC.java	                        (rev 0)
+++ mspsim/se/sics/mspsim/util/CCITT_CRC.java	2008-11-09 20:05:53 UTC (rev 418)
@@ -0,0 +1,59 @@
+/**
+ * Copyright (c) 2008, 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.
+ *
+ * This file is part of MSPSim.
+ *
+ * -----------------------------------------------------------------
+ *
+ * Author  : Joakim Eriksson
+ */
+
+package se.sics.mspsim.util;
+
+/* basic CRC-CCITT code */
+public class CCITT_CRC {
+  int crc;
+
+  public int getCRC() {
+    return crc;
+  }
+  
+  public void clr() {
+    crc = 0xffff;
+  }
+  
+  public int add(int data) {
+    int newCrc = (crc >> 8) | (crc << 8) & 0xffff;
+    newCrc ^= data & 0xff;
+    newCrc ^= (newCrc & 0xff) >> 4;
+    newCrc ^= (newCrc << 12);
+    newCrc ^= (newCrc & 0xff) << 5;
+    crc = newCrc;
+    return crc;
+  }
+  
+}


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