beginning of branch i2p.i2p.i2p

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

@@ -0,0 +1,84 @@
+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.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import net.i2p.data.DataFormatException;
+import net.i2p.data.DataHelper;
+import net.i2p.util.Log;
+
+/**
+ * Defines a message containing arbitrary bytes of data
+ *
+ * @author jrandom
+ */
+public class DataMessage extends I2NPMessageImpl {
+    private final static Log _log = new Log(DataMessage.class);
+    public final static int MESSAGE_TYPE = 20;
+    private byte _data[];
+    
+    public DataMessage() { 
+	_data = null;
+    }
+    
+    public byte[] getData() { return _data; }
+    public void setData(byte data[]) { _data = data; }
+    
+    public int getSize() { return _data.length; }
+    
+    public void readMessage(InputStream in, int type) throws I2NPMessageException, IOException {
+	if (type != MESSAGE_TYPE) throw new I2NPMessageException("Message type is incorrect for this message");
+        try {
+	    int size = (int)DataHelper.readLong(in, 4);
+	    _data = new byte[size];
+	    int read = read(in, _data);
+	    if (read != size) 
+		throw new DataFormatException("Not enough bytes to read (read = " + read + ", expected = " + size + ")");
+        } catch (DataFormatException dfe) {
+            throw new I2NPMessageException("Unable to load the message data", dfe);
+        }
+    }
+    
+    protected byte[] writeMessage() throws I2NPMessageException, IOException {
+	ByteArrayOutputStream os = new ByteArrayOutputStream((_data != null ? _data.length + 4 : 4));
+        try {
+	    DataHelper.writeLong(os, 4, (_data != null ? _data.length : 0));
+	    os.write(_data);
+        } catch (DataFormatException dfe) {
+            throw new I2NPMessageException("Error writing out the message data", dfe);
+        }
+        return os.toByteArray();
+    }
+    
+    public int getType() { return MESSAGE_TYPE; }
+    
+    public int hashCode() {
+	return DataHelper.hashCode(getData());
+    }
+    
+    public boolean equals(Object object) {
+        if ( (object != null) && (object instanceof DataMessage) ) {
+            DataMessage msg = (DataMessage)object;
+            return DataHelper.eq(getData(),msg.getData());
+        } else {
+            return false;
+        }
+    }
+    
+    public String toString() { 
+        StringBuffer buf = new StringBuffer();
+        buf.append("[DataMessage: ");
+        buf.append("\n\tData: ").append(DataHelper.toString(getData(), 64));
+        buf.append("]");
+        return buf.toString();
+    }
+}