Added DNS message compression, it does not handle it right now

src/zutil/converter/Converter.java

@@ -128,8 +128,9 @@ public class Converter {
 	 * 
 	 * @param 	hex     is the hex value
 	 * @return a byte that corresponds to the hex
+	 * @throws IllegalArgumentException if hex is not a valid hex character
 	 */
-	public static byte hexToByte( char hex ){
+	public static byte hexToByte( char hex ) throws IllegalArgumentException{
 		switch( Character.toLowerCase(hex) ){
 		case '0': return 0x00;
 		case '1': return 0x01;
@@ -147,8 +148,9 @@ public class Converter {
 		case 'd': return 0x0d;
 		case 'e': return 0x0e;
 		case 'f': return 0x0f;
+		default:
+			throw new IllegalArgumentException("'"+hex+"' is an illegal hex character only 0-9 and a-f characters allowed");
 		}
-		return (byte)0;
 	}
 
 	/** 

src/zutil/net/dns/DNSPacket.java

@@ -11,7 +11,8 @@ import java.util.List;
 /**
  * This class is a general wrapper for a whole DNS packet.
  *
- * Created by Ziver on 2016-04-11.
+ * @see <a href="https://tools.ietf.org/html/rfc1035">rfc1035</a>
+ * @author Ziver on 2016-04-11.
  */
 public class DNSPacket {
     private DNSPacketHeader header;

src/zutil/net/dns/DNSPacketQuestion.java

@@ -151,13 +151,22 @@ public class DNSPacketQuestion implements BinaryStruct {
         public String read(InputStream in, BinaryFieldData field) throws IOException {
             StringBuilder str = new StringBuilder();
             int c = in.read();
-            while (c > 0){
-                for (int i=0; i<c; ++i){
-                    str.append((char)in.read());
+            // Is this a pointer
+            if ((c & 0b1100_0000) == 0b1100_0000 ){
+                int offset = (c & 0b0011_1111) << 8;
+                offset |= in.read() & 0b1111_1111;
+                str.append(offset);
+            }
+            // Normal Domain String
+            else {
+                while (c > 0) {
+                    for (int i = 0; i < c; ++i) {
+                        str.append((char) in.read());
+                    }
+                    c = in.read();
+                    if (c > 0)
+                        str.append('.');
                 }
-                c = in.read();
-                if (c > 0)
-                    str.append('.');
             }
             return str.toString();
         }

src/zutil/parser/binary/BinaryFieldData.java

@@ -156,4 +156,18 @@ public class BinaryFieldData {
     public BinaryFieldSerializer getSerializer(){
         return serializer;
     }
+
+
+    @Override
+    public String toString(){
+        return field.getDeclaringClass().getSimpleName() + "::" + field.getName() +
+                " (" +
+                (lengthField != null ?
+                    "LengthField: " + lengthField +", LengthMultiplier: "+lengthMultiplier :
+                    length+" bits") +
+                (serializer != null ?
+                    ", Serializer: " + serializer.getClass().getName() : "") +
+                ")";
+
+    }
 }