/*
* LumaQQ - Java QQ Client
*
* Copyright (C) 2004 luma <stubma@163.com>
*
* 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
*/
package edu.tsinghua.lumaqq.qq.packets.in;

import java.nio.ByteBuffer;

import edu.tsinghua.lumaqq.qq.PacketParseException;
import edu.tsinghua.lumaqq.qq.QQ;
import edu.tsinghua.lumaqq.qq.packets.InPacket;


/**
 * <pre>
 * 請(qǐng)求密鑰的回復(fù)包，格式為:
 * 1. 頭部
 * 2. 密鑰類型，一字節(jié)
 * 3. 未知字節(jié)，應(yīng)該是回復(fù)碼，0表示成功
 * 4. 密鑰，16字節(jié)
 * 5. 未知的8字節(jié)，全0
 * 6. 未知的4字節(jié)，全0
 * 7. 文件中轉(zhuǎn)認(rèn)證令牌字節(jié)長(zhǎng)度
 * 8. 令牌
 * 9. 未知的4字節(jié)，全0
 * 10. 尾部
 * </pre>
 *
 * @author 馬若劼
 */
public class RequestKeyReplyPacket extends InPacket {
    public byte[] key;
    public byte[] token;
    public byte keyType;
    public byte replyCode;
    
    /**
     * 構(gòu)造函數(shù)
     * @param buf 緩沖區(qū)
     * @param length 包長(zhǎng)度
     * @throws PacketParseException 解析錯(cuò)誤
     */
    public RequestKeyReplyPacket(ByteBuffer buf, int length) throws PacketParseException {
        super(buf, length);
    }   
    
    /* (non-Javadoc)
     * @see edu.tsinghua.lumaqq.qq.packets.InPacket#parseBody(java.nio.ByteBuffer)
     */
    protected void parseBody(ByteBuffer buf) throws PacketParseException {
        // 密鑰類型
        keyType = buf.get();
        // 回復(fù)碼
        replyCode = buf.get();
        if(replyCode == QQ.QQ_REQUEST_KEY_REPLY_OK) {
	        // 密鑰
	        key = new byte[QQ.QQ_KEY_LENGTH];
	        buf.get(key);
	        // 未知的8字節(jié)，全0
	        // 未知的4字節(jié)，全0
	        buf.position(buf.position() + 12);
	        // 文件中轉(zhuǎn)認(rèn)證令牌字節(jié)長(zhǎng)度
	        int len = buf.get() & 0xFF;
	        // 令牌
	        token = new byte[len];
	        buf.get(token);            
        }
    }
}