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  /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.commons.net.tftp;
 
A final class derived from TFTPPacket definiing the TFTP Acknowledgement packet type.

Details regarding the TFTP protocol and the format of TFTP packets can be found in RFC 783. But the point of these classes is to keep you from having to worry about the internals. Additionally, only very few people should have to care about any of the TFTPPacket classes or derived classes. Almost all users should only be concerned with the TFTPClient class receiveFile() and sendFile() methods.

 
 
 public final class TFTPAckPacket extends TFTPPacket
 {
    
The block number being acknowledged by the packet. *
 
     int _blockNumber;

    
Creates an acknowledgment packet to be sent to a host at a given port acknowledging receipt of a block.

Parameters:
destination The host to which the packet is going to be sent.
port The port to which the packet is going to be sent.
blockNumber The block number being acknowledged.
 
     public TFTPAckPacket(InetAddress destinationint portint blockNumber)
     {
         super(.destinationport);
          = blockNumber;
     }

    
Creates an acknowledgement packet based from a received datagram. Assumes the datagram is at least length 4, else an ArrayIndexOutOfBoundsException may be thrown.

Parameters:
datagram The datagram containing the received acknowledgement.
Throws:
TFTPPacketException If the datagram isn't a valid TFTP acknowledgement packet.
 
     TFTPAckPacket(DatagramPacket datagramthrows TFTPPacketException
     {
         super(.datagram.getAddress(),
               datagram.getPort());
         byte[] data;
 
         data = datagram.getData();
 
         if (getType() != data[1]) {
             throw new TFTPPacketException("TFTP operator code does not match type.");
         }
 
          = (((data[2] & 0xff) << 8) | (data[3] & 0xff));
     }

    
This is a method only available within the package for implementing efficient datagram transport by elminating buffering. It takes a datagram as an argument, and a byte buffer in which to store the raw datagram data. Inside the method, the data is set as the datagram's data and the datagram returned.

Parameters:
datagram The datagram to create.
data The buffer to store the packet and to use in the datagram.
Returns:
The datagram argument.
 
     @Override
     DatagramPacket _newDatagram(DatagramPacket datagrambyte[] data)
    {
        data[0] = 0;
        data[1] = (byte);
        data[2] = (byte)(( & 0xffff) >> 8);
        data[3] = (byte)( & 0xff);
        datagram.setAddress();
        datagram.setPort();
        datagram.setData(data);
        datagram.setLength(4);
        return datagram;
    }


    
Creates a UDP datagram containing all the TFTP acknowledgement packet data in the proper format. This is a method exposed to the programmer in case he wants to implement his own TFTP client instead of using the TFTPClient class. Under normal circumstances, you should not have a need to call this method.

Returns:
A UDP datagram containing the TFTP acknowledgement packet.
    @Override
    public DatagramPacket newDatagram()
    {
        byte[] data;
        data = new byte[4];
        data[0] = 0;
        data[1] = (byte);
        data[2] = (byte)(( & 0xffff) >> 8);
        data[3] = (byte)( & 0xff);
        return new DatagramPacket(datadata.length);
    }


    
Returns the block number of the acknowledgement.

Returns:
The block number of the acknowledgement.
    public int getBlockNumber()
    {
        return ;
    }


    
Sets the block number of the acknowledgement. *
    public void setBlockNumber(int blockNumber)
    {
         = blockNumber;
    }
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