/*
* bitlet - Simple bittorrent library
* Copyright (C) 2008 Alessandro Bahgat Shehata, Daniele Castagna
*
* 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 org.bitlet.wetorrent.peer.message;
import java.io.IOException;
import org.bitlet.wetorrent.disk.TorrentDisk;
import org.bitlet.wetorrent.util.Utils;
public class Piece extends Message {
private int index;
private int length;
private int begin;
private TorrentDisk torrentDisk;
/** Creates a new instance of Piece */
public Piece(int index, int begin, int length, TorrentDisk torrentDisk) {
super(Message.PIECE, null);
this.torrentDisk = torrentDisk;
this.index = index;
this.length = length;
this.begin = begin;
}
public int getIndex() {
return index;
}
public int getLength() {
return length;
}
public int getBegin() {
return begin;
}
public byte[] getPayload() {
if (super.getPayload() == null) {
try {
byte[] block = torrentDisk.read(index, begin, length);
byte[] payload = new byte[block.length + 8];
System.arraycopy(block, 0, payload, 8, block.length);
System.arraycopy(Utils.intToByteArray(index), 0, payload, 0, 4);
System.arraycopy(Utils.intToByteArray(begin), 0, payload, 4, 4);
setPayload(payload);
} catch (IOException ex) {
}
}
return super.getPayload();
}
}