//*************************************************************************
// OutPacket.h: interface for the COutPacket class.
// Version : 1.000
// Date : July 2007
// Author : Ye Feng
// Email :  vcye23@gmail.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., 675 Mass Ave, Cambridge, MA 02139, USA.
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_OUTPACKET_H__8093B5C6_46AA_4DE9_9D7A_39F786FF3E29__INCLUDED_)
#define AFX_OUTPACKET_H__8093B5C6_46AA_4DE9_9D7A_39F786FF3E29__INCLUDED_

#include "QQUser.h"
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#define MAX_SEND_PACKET_SIZE                800    // 最大发送包是800

#define PUT_BYTE(pbBuf, iBufLen, b)    \
{    \
    *pbBuf = b;    \
    pbBuf += sizeof(BYTE);    \
    iBufLen += sizeof(BYTE);    \
}

#define PUT_WORD(pbBuf, iBufLen, w)    \
{    \
    *pbBuf = (w & 0xFF00) >> 8;    \
    *(pbBuf + 1) = w & 0xFF;    \
    pbBuf += sizeof(WORD);    \
    iBufLen += sizeof(WORD);    \
}

#define PUT_DWORD(pbBuf, iBufLen, dw)    \
{    \
    *pbBuf = (dw & 0xFF000000) >> 24;    \
    *(pbBuf + 1) = (dw & 0xFF0000) >> 16;    \
    *(pbBuf + 2) = (dw & 0xFF00) >> 8;    \
    *(pbBuf + 3) = dw & 0xFF;    \
    pbBuf += sizeof(DWORD);    \
    iBufLen += sizeof(DWORD);    \
}

#define PUT_BYTES(pbBuf, iBufLen, pbBytes, cBytes)    \
{    \
    memcpy(pbBuf, pbBytes, cBytes);    \
    pbBuf += cBytes;    \
    iBufLen += cBytes;    \
}

#define FILL_BYTES(pbBuf, iBufLen, cTotalBytes)    \
{    \
    if( iBufLen < cTotalBytes )    \
    {    \
        memset(pbBuf, 0, cTotalBytes - iBufLen);    \
        pbBuf += cTotalBytes - iBufLen;    \
        iBufLen = cTotalBytes;    \
    }    \
}

class COutPacket  
{
public:
    COutPacket(BYTE bHeader, short sCommand, bool bAck, CQQUser* pQQUser);
    COutPacket(BYTE* pbBuf, size_t iBufLen);
    virtual ~COutPacket();

public:
    size_t FillBuffer(BYTE* pbBuf, size_t iBufLen) const;
    // 只有reply包有权调用SetSequence（和源包的sequence相同）
    void SetSequence(short sSequence) { m_sSequence = sSequence; }
    short GetSequence() const { return m_sSequence; }
    short GetCommand() const { return m_sCommand; }

protected:
    virtual size_t EncryptBody(BYTE* pbBody, size_t iBodyLen, BYTE* pbBuf, size_t iBufLen) const = 0;
    /**
     * 回填，有些字段必须填完整个包才能确定其内容，比如长度字段，那么这个方法将在
     * 尾部填充之后调用
     * 
     * @param buf
     *         ByteBuffer
     * @param startPos
     *         包起始位置
     */
    virtual size_t PostFill(BYTE* pbBufStart, size_t iBufLen) const = 0;

    virtual size_t PutHeader(BYTE* pbBuf, size_t iBufLen) const = 0;
    virtual size_t PutTail(BYTE* pbBuf, size_t iBufLen) const = 0;
    virtual size_t PutBody(BYTE* pbBuf, size_t iBufLen) const = 0;

    BYTE m_bHeader;
    short m_sSource;
    short m_sCommand;
    /** 包起始序列号 */
    short m_sSequence;
    /** 是否需要回应 */
    bool m_bAck;
    CQQUser* m_pQQUser;

};

#endif // !defined(AFX_OUTPACKET_H__8093B5C6_46AA_4DE9_9D7A_39F786FF3E29__INCLUDED_)