GGEP.h

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//
// GGEP.h
//
// Copyright (c) Shareaza Development Team, 2002-2005.
// This file is part of SHAREAZA (www.shareaza.com)
//
// Shareaza 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.
//
// Shareaza 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 Shareaza; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//

#if !defined(AFX_GGEP_H__7081FCAC_A207_412A_BD18_A72F09F89F05__INCLUDED_)
#define AFX_GGEP_H__7081FCAC_A207_412A_BD18_A72F09F89F05__INCLUDED_

#pragma once

class CGGEPBlock;
class CGGEPItem;
class CPacket;


class CGGEPBlock
{
// Construction
public:
        CGGEPBlock();
        virtual ~CGGEPBlock();

// Attributes
public:
        CGGEPItem*      m_pFirst;
        CGGEPItem*      m_pLast;
        BYTE*           m_pInput;
        DWORD           m_nInput;

// Operations
public:
        void            Clear();
        CGGEPItem*      Add(LPCTSTR pszID);
        CGGEPItem*      Find(LPCTSTR pszID, DWORD nMinLength = 0);
public:
        BOOL            ReadFromPacket(CPacket* pPacket);
        BOOL            ReadFromString(LPCTSTR pszData);
        void            Write(CPacket* pPacket);
        void            Write(CString& str);
        static          CGGEPBlock* FromPacket(CPacket* pPacket);
protected:
        BOOL    ReadInternal();
        BYTE    ReadByte();

        friend class CGGEPItem;
};


class CGGEPItem
{
// Construction
public:
        CGGEPItem(LPCTSTR pszID = NULL);
        virtual ~CGGEPItem();

// Attributes
public:
        CGGEPItem*      m_pNext;
        CString         m_sID;
        BYTE*           m_pBuffer;
        DWORD           m_nLength;
        DWORD           m_nPosition;

// Operations
public:
        BOOL    IsNamed(LPCTSTR pszID);
        void    Read(LPVOID pData, int nLength);
        BYTE    ReadByte();
        void    Write(LPCVOID pData, int nLength);
        void    WriteByte(BYTE nValue);
        CString ToString();
protected:
        BOOL    ReadFrom(CGGEPBlock* pBlock, BYTE nFlags);
        void    WriteTo(CPacket* pPacket);
        void    WriteTo(CString& str);
protected:
        BOOL    Encode(BOOL bIfZeros = FALSE);
        BOOL    Decode();
        BOOL    Deflate(BOOL bIfSmaller = FALSE);
        BOOL    Inflate();

        friend class CGGEPBlock;
};

//
// Constants
//

#define GGEP_HDR_LAST           0x80
#define GGEP_HDR_COBS           0x40
#define GGEP_HDR_DEFLATE        0x20
#define GGEP_HDR_IDLEN          0x0F
#define GGEP_LEN_MORE           0x80
#define GGEP_LEN_LAST           0x40
#define GGEP_LEN_MASK           0x3F

#endif // !defined(AFX_GGEP_H__7081FCAC_A207_412A_BD18_A72F09F89F05__INCLUDED_)

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