package net.i2p.data.i2cp;
/*
* 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 java.io.InputStream;
import java.io.OutputStream;
import net.i2p.data.DataFormatException;
import net.i2p.data.DataHelper;
import net.i2p.data.Payload;
/**
* Defines the payload message a router sends to the client
*
* @author jrandom
*/
public class MessagePayloadMessage extends I2CPMessageImpl {
public final static int MESSAGE_TYPE = 31;
private int _sessionId;
private long _messageId;
private Payload _payload;
public MessagePayloadMessage() {
_sessionId = -1;
_messageId = -1;
}
public long getSessionId() {
return _sessionId;
}
/**
* Return the SessionId for this message.
*
* @since 0.9.21
*/
@Override
public SessionId sessionId() {
return _sessionId >= 0 ? new SessionId(_sessionId) : null;
}
/** @param id 0-65535 */
public void setSessionId(long id) {
_sessionId = (int) id;
}
public long getMessageId() {
return _messageId;
}
public void setMessageId(long id) {
_messageId = id;
}
public Payload getPayload() {
return _payload;
}
public void setPayload(Payload payload) {
_payload = payload;
}
@Override
protected void doReadMessage(InputStream in, int size) throws I2CPMessageException, IOException {
try {
_sessionId = (int) DataHelper.readLong(in, 2);
_messageId = DataHelper.readLong(in, 4);
_payload = new Payload();
_payload.readBytes(in);
} catch (DataFormatException dfe) {
throw new I2CPMessageException("Unable to load the message data", dfe);
}
}
/**
* @throws UnsupportedOperationException always
*/
@Override
protected byte[] doWriteMessage() throws I2CPMessageException, IOException {
throw new UnsupportedOperationException();
}
/**
* Write out the full message to the stream, including the 4 byte size and 1
* byte type header.
*
* @throws IOException
*/
@Override
public void writeMessage(OutputStream out) throws I2CPMessageException, IOException {
if (_sessionId <= 0)
throw new I2CPMessageException("Unable to write out the message, as the session ID has not been defined");
if (_messageId < 0)
throw new I2CPMessageException("Unable to write out the message, as the message ID has not been defined");
if (_payload == null)
throw new I2CPMessageException("Unable to write out the message, as the payload has not been defined");
int size = 2 + 4 + 4 + _payload.getSize();
try {
DataHelper.writeLong(out, 4, size);
out.write((byte) MESSAGE_TYPE);
DataHelper.writeLong(out, 2, _sessionId);
DataHelper.writeLong(out, 4, _messageId);
DataHelper.writeLong(out, 4, _payload.getSize());
out.write(_payload.getEncryptedData());
} catch (DataFormatException dfe) {
throw new I2CPMessageException("Unable to write the message length or type", dfe);
}
}
public int getType() {
return MESSAGE_TYPE;
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append("[MessagePayloadMessage: ");
buf.append("\n\tSessionId: ").append(_sessionId);
buf.append("\n\tMessageId: ").append(_messageId);
buf.append("\n\tPayload: ").append(_payload);
buf.append("]");
return buf.toString();
}
}