/*
* Created on Apr 30, 2004
* Created by Alon Rohter
* Copyright (C) 2004, 2005, 2006 Aelitis, All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* AELITIS, SAS au capital de 46,603.30 euros
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*
*/
package com.aelitis.azureus.core.peermanager.messaging.bittorrent;
import org.gudy.azureus2.core3.util.*;
import com.aelitis.azureus.core.peermanager.messaging.Message;
import com.aelitis.azureus.core.peermanager.messaging.MessageException;
/**
* BitTorrent piece message.
*/
public class BTPiece implements BTMessage {
private byte version;
private final DirectByteBuffer[] buffer = new DirectByteBuffer[ 2 ];
private String description;
private final int piece_number;
private final int piece_offset;
private final int piece_length;
public BTPiece( int piece_number, int piece_offset, DirectByteBuffer data, byte version ) {
this.piece_number = piece_number;
this.piece_offset = piece_offset;
this.piece_length = data == null ? 0 : data.remaining( DirectByteBuffer.SS_MSG );
buffer[1] = data;
this.version = version;
}
public int getPieceNumber() { return piece_number; }
public int getPieceOffset() { return piece_offset; }
public DirectByteBuffer getPieceData() { return buffer[1]; }
public String getID() { return BTMessage.ID_BT_PIECE; }
public byte[] getIDBytes() { return BTMessage.ID_BT_PIECE_BYTES; }
public String getFeatureID() { return BTMessage.BT_FEATURE_ID; }
public int getFeatureSubID() { return BTMessage.SUBID_BT_PIECE; }
public int getType() { return Message.TYPE_DATA_PAYLOAD; }
public byte getVersion() { return version; };
public String getDescription() {
if( description == null ) {
description = BTMessage.ID_BT_PIECE + " data for piece #" + piece_number + ":" + piece_offset + "->" + (piece_offset + piece_length -1);
}
return description;
}
public DirectByteBuffer[] getData() {
if( buffer[0] == null ) {
buffer[0] = DirectByteBufferPool.getBuffer( DirectByteBuffer.AL_MSG_BT_PIECE, 8 );
buffer[0].putInt( DirectByteBuffer.SS_MSG, piece_number );
buffer[0].putInt( DirectByteBuffer.SS_MSG, piece_offset );
buffer[0].flip( DirectByteBuffer.SS_MSG );
}
return buffer;
}
public Message deserialize( DirectByteBuffer data, byte version ) throws MessageException {
if( data == null ) {
throw new MessageException( "[" +getID() + "] decode error: data == null" );
}
if( data.remaining( DirectByteBuffer.SS_MSG ) < 8 ) {
throw new MessageException( "[" +getID()+ "] decode error: payload.remaining[" +data.remaining( DirectByteBuffer.SS_MSG )+ "] < 8" );
}
int number = data.getInt( DirectByteBuffer.SS_MSG );
if( number < 0 ) {
throw new MessageException( "[" +getID() +"] decode error: number < 0" );
}
int offset = data.getInt( DirectByteBuffer.SS_MSG );
if( offset < 0 ) {
throw new MessageException( "[" +getID() + "] decode error: offset < 0" );
}
return new BTPiece( number, offset, data, version );
}
public void destroy() {
if( buffer[0] != null ) buffer[0].returnToPool();
if( buffer[1] != null ) buffer[1].returnToPool();
}
}
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