Added CRC

- CRC checking now works
#story[782]

network/src/main/java/seng302/Networking/BinaryMessageDecoder.java

@@ -49,11 +49,13 @@ public class BinaryMessageDecoder {
 
         //get crc
         this.crc = Arrays.copyOfRange(this.fullMessage, this.fullMessage.length - 4, fullMessage.length);
-
+        ByteBuffer bytes = ByteBuffer.allocate(this.header.length + this.message.length);
+        bytes.put(this.header);
+        bytes.put(this.message);
 
         CRC32 crc = new CRC32();
         crc.reset();
-        crc.update(this.fullMessage);
+        crc.update(bytes.array(), 0, bytes.array().length);
 
         //run through the checks
         if (this.message.length != ByteConverter.bytesToShort(this.headerMessageLength)){//keep like this - hba65
@@ -67,11 +69,11 @@ public class BinaryMessageDecoder {
         }else if(this.headerSync2 !=(byte) 0x83){
             System.err.println("Sync byte 2 is wrong: " + this.headerSync2);
             return null;
-        }/*else if(crc.getValue() != 0){
+        }else if(crc.getValue() != ByteConverter.bytesToLong(this.crc)){
             //todo check crc
-            System.err.println("CRC is not 0 and is instead:" + crc.getValue());
-            return;
-        }*/
+            System.err.println("CRC is not "+ByteConverter.bytesToLong(this.crc)+" and is instead:" + crc.getValue());
+            return null;
+        }
 
         MessageType mType = MessageType.valueOf(this.headerMessageType);
         AC35Data data = null;

network/src/main/java/seng302/Networking/PacketDump/AC35DumpReader.java

@@ -14,6 +14,8 @@ import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.zip.CRC32;
+import java.util.zip.Checksum;
 
 /**
  * Created by fwy13 on 25/04/17.