* I2NP: Add UnknownI2NPMessage so we can route unknown message types

router/java/src/net/i2p/data/i2np/UnknownI2NPMessage.java

@@ -0,0 +1,114 @@
+package net.i2p.data.i2np;
+/*
+ * free (adj.): unencumbered; not under the control of others
+ * Written by jrandom in 2003 and released into the public domain
+ * with no warranty of any kind, either expressed or implied.
+ * It probably won't make your computer catch on fire, or eat
+ * your children, but it might.  Use at your own risk.
+ *
+ */
+
+import java.io.IOException;
+
+import net.i2p.I2PAppContext;
+import net.i2p.data.DataHelper;
+
+/**
+ * This is the same as DataMessage but with a variable message type.
+ * This is defined so routers can route messages they don't know about.
+ * We don't extend DataMessage so that any code that does (instanceof DataMessage)
+ * won't return true for this type. Load tests use DataMessage, for example.
+ * See InboundMessageDistributor.
+ *
+ * There is no setData() method, the only way to create one of these is to
+ * read it with readMessage() (i.e., it came from some other router)
+ *
+ * @since 0.7.12
+ */
+public class UnknownI2NPMessage extends I2NPMessageImpl {
+    private byte _data[];
+    private int _type;
+    
+    /** @param type 0-255 */
+    public UnknownI2NPMessage(I2PAppContext context, int type) {
+        super(context);
+        _type = type;
+    }
+    
+    /** warning - only public for equals() */
+    public byte[] getData() { 
+        verifyUnwritten();
+        return _data; 
+    }
+
+    public void readMessage(byte data[], int offset, int dataSize, int type) throws I2NPMessageException, IOException {
+        if (type != _type) throw new I2NPMessageException("Message type is incorrect for this message");
+        int curIndex = offset;
+        long size = DataHelper.fromLong(data, curIndex, 4);
+        curIndex += 4;
+        if (size > MAX_SIZE)
+            throw new I2NPMessageException("wtf, size=" + size);
+        _data = new byte[(int)size];
+        System.arraycopy(data, curIndex, _data, 0, (int)size);
+    }
+    
+    /** calculate the message body's length (not including the header and footer */
+    protected int calculateWrittenLength() { 
+        if (_data == null) 
+            return 4;
+        else
+            return 4 + _data.length;
+    }
+
+    /** write the message body to the output array, starting at the given index */
+    protected int writeMessageBody(byte out[], int curIndex) {
+        verifyUnwritten();
+        if (_data == null) {
+            out[curIndex++] = 0x0;
+            out[curIndex++] = 0x0;
+            out[curIndex++] = 0x0;
+            out[curIndex++] = 0x0;
+        } else {
+            byte len[] = DataHelper.toLong(4, _data.length);
+            System.arraycopy(len, 0, out, curIndex, 4);
+            curIndex += 4;
+            System.arraycopy(_data, 0, out, curIndex, _data.length);
+            curIndex += _data.length;
+        }
+        return curIndex;
+    }
+    
+    @Override
+    protected void written() {
+        super.written();
+        _data = null;
+    }
+    
+    /** @return 0-255 */
+    public int getType() { return _type; }
+    
+    @Override
+    public int hashCode() {
+        return _type + DataHelper.hashCode(getData());
+    }
+    
+    @Override
+    public boolean equals(Object object) {
+        if ( (object != null) && (object instanceof UnknownI2NPMessage) ) {
+            UnknownI2NPMessage msg = (UnknownI2NPMessage)object;
+            return _type == msg.getType() && DataHelper.eq(getData(), msg.getData());
+        } else {
+            return false;
+        }
+    }
+    
+    @Override
+    public String toString() {
+        StringBuilder buf = new StringBuilder();
+        buf.append("[UnknownI2NPMessage: ");
+        buf.append("\n\tType: ").append(_type);
+        buf.append("\n\tLength: ").append(calculateWrittenLength() - 4);
+        buf.append("]");
+        return buf.toString();
+    }
+}