/*
* LoginSeedPacket.java
*
* Created on May 13, 2007, 5:36 PM
*************************************************************************
* Copyright 2008 Paul Smith
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package ao.protocol.packets.toclient;
import ao.protocol.packets.*;
import ao.protocol.packets.utils.PacketParser;
import ao.protocol.packets.utils.PacketSerializer;
import java.io.IOException;
/**
* <p>LoginSeedPacket is sent from the AO server to the client
* when a connection between them is established. The seed that
* the server sends to the client is used in the autentication process.
* Currently the seed is always a 32 character hexadecimal string (128 bit).</p>
*
* <p>PACKET TYPE: {@value #TYPE}
* <br>FORMAT: S
* <br>DIRECTION: in</p>
*
* @author Paul Smith
* @see ao.protocol.packets.toserver.LoginRequestPacket
*/
public class LoginSeedPacket extends Packet {
public static final short TYPE = 0;
private final String m_seed;
private final byte[] m_data;
/**
* Creates a new instance of LoginSeedPacket
*
* @param seed
* the seed that will be sent to the client
* @throws NullPointerException
* if seed is null
*/
public LoginSeedPacket(String seed) {
if (seed == null) {
throw new NullPointerException("No seed was passed.");
}
m_seed = seed;
// Serialize the packet
PacketSerializer serializer =
new PacketSerializer(2 + m_seed.length());
serializer.write(m_seed);
m_data = serializer.getResult();
serializer.close();
} // end LoginSeedPacket()
/**
* Creates a new instance of LoginSeedPacket
*
* @param data
* the binary data of this packet (without the type and length bytes)
* @throws NullPointerException
* if data is null
* @throws MalformedPacketException
* if the packet is malformed
*/
public LoginSeedPacket(byte[] data) throws MalformedPacketException {
if (data == null) {
throw new NullPointerException("No binary data was passed.");
}
try {
m_data = data;
PacketParser parser = new PacketParser(data);
// Parse the packet
m_seed = parser.parseString();
parser.close();
} catch (IOException e) {
throw new MalformedPacketException(
"The packet could not be parsed.", e, new UnparsablePacket(TYPE, data, Direction.TO_CLIENT));
} // end catch
} // end LoginSeedPacket()
/** Returns the seed that was recieved from the server */
public String getLoginSeed() {
return m_seed;
}
/** Always returns {@value #TYPE} */
public short getType() {
return TYPE;
}
public byte[] getData() {
return m_data;
}
/** Always returns {@code Direction.TO_CLIENT} */
public Direction getDirection() {
return Direction.TO_CLIENT;
}
@Override
public String toString() {
return "[" + TYPE + "]LoginSeedPacket: " + m_seed;
} // end toString()
} // end class LoginSeedPacket