Initial code check in continued

src/crc/CRCUtil.java

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+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 Dennis Sheirer
+ * 
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>
+ ******************************************************************************/
+package crc;
+
+import java.util.BitSet;
+
+public class CRCUtil
+{
+    public static BitSet check( BitSet originalMessage,
+                         int messageLength,
+                         BitSet polynomial,
+                         int polynomialLength )
+    {
+        //Make a copy of the message, since we're going to modify it
+        BitSet copy = originalMessage.get( 0, messageLength );
+
+        //Iterate through the message bits
+        for( int x = 0; x < messageLength; x++ )
+        {
+            //If we're aligned against a starting 1 in the message, divide it
+            if( copy.get( 0 ) )
+            {
+                copy.xor( polynomial );
+            }
+            
+            //Left shift the message
+            copy = copy.get( 1, messageLength + polynomialLength - x );
+        }
+        
+        return copy.get( 0, polynomialLength );
+    }
+    
+    public static void log( String message )
+    {
+        System.out.println( message );
+    }
+    
+    public enum Status
+    {
+        PASS, FAIL, BITINVERTED, WORDINVERTED;
+    }
+
+}