Added DataFileMessage and GetDataFileMessage, used for requesting and sending files between peers.

src/main/java/org/qortal/network/message/DataFileMessage.java

@@ -0,0 +1,44 @@
+package org.qortal.network.message;
+
+import org.qortal.storage.DataFile;
+
+import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
+
+public class DataFileMessage extends Message {
+	
+	private final DataFile dataFile;
+
+	public DataFileMessage(DataFile dataFile) {
+		super(MessageType.DATA_FILE);
+
+		this.dataFile = dataFile;
+	}
+
+	public DataFile getDataFile() {
+		return this.dataFile;
+	}
+
+	public static Message fromByteBuffer(int id, ByteBuffer byteBuffer) throws UnsupportedEncodingException {
+		byte[] bytes = new byte[byteBuffer.remaining()];
+		byteBuffer.get(bytes);
+		DataFile dataFile = new DataFile(bytes);
+
+		return new DataFileMessage(dataFile);
+	}
+
+	@Override
+	protected byte[] toData() {
+		if (this.dataFile == null)
+			return null;
+
+		return this.dataFile.getBytes();
+	}
+
+	public DataFileMessage cloneWithNewId(int newId) {
+		DataFileMessage clone = new DataFileMessage(this.dataFile);
+		clone.setId(newId);
+		return clone;
+	}
+
+}

src/main/java/org/qortal/network/message/GetDataFileMessage.java

@@ -0,0 +1,52 @@
+package org.qortal.network.message;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
+
+public class GetDataFileMessage extends Message {
+
+	private static final int DIGEST_LENGTH = 32;
+
+	private final byte[] digest;
+
+	public GetDataFileMessage(byte[] digest) {
+		this(-1, digest);
+	}
+
+	private GetDataFileMessage(int id, byte[] digest) {
+		super(id, MessageType.GET_DATA_FILE);
+
+		this.digest = digest;
+	}
+
+	public byte[] getDigest() {
+		return this.digest;
+	}
+
+	public static Message fromByteBuffer(int id, ByteBuffer bytes) throws UnsupportedEncodingException {
+		if (bytes.remaining() != DIGEST_LENGTH)
+			return null;
+
+		byte[] digest = new byte[DIGEST_LENGTH];
+
+		bytes.get(digest);
+
+		return new GetDataFileMessage(id, digest);
+	}
+
+	@Override
+	protected byte[] toData() {
+		try {
+			ByteArrayOutputStream bytes = new ByteArrayOutputStream();
+
+			bytes.write(this.digest);
+
+			return bytes.toByteArray();
+		} catch (IOException e) {
+			return null;
+		}
+	}
+
+}