/*
Module : Base64Coder.CPP
Purpose: Definition for the Base64 encoder / decoder class
Created: PJN / 20-06-2000
History: None

Copyright (c) 1998 - 2002 by PJ Naughter.  
All rights reserved.

*/

/////////////////////////////// Defines ///////////////////////////////////////
#ifndef __BASE64CODER_H__
#define __BASE64CODER_H__


/////////////////////////////// Classes ///////////////////////////////////////

class CBase64Coder  
{
public:
//Constructors / Destructors
	CBase64Coder();
	virtual ~CBase64Coder();

//方法
	virtual void	 Encode(const PBYTE, DWORD);
	virtual void	 Decode(const PBYTE, DWORD);
	virtual void	 Encode(LPCSTR sMessage);
	virtual void	 Decode(LPCSTR sMessage);
	virtual LPSTR  DecodedMessage() const;
	virtual LPSTR  EncodedMessage() const;
	virtual LONG	 DecodedMessageSize() const;
	virtual LONG	 EncodedMessageSize() const;

protected:
// Internal bucket class.
	class TempBucket
	{
	public:
		BYTE		nData[4];
		BYTE		nSize;
		void		Clear() { ::ZeroMemory(nData, 4); nSize = 0; };
	};

//變量
	PBYTE	m_pDBuffer;
	PBYTE	m_pEBuffer;
	DWORD	m_nDBufLen;
	DWORD	m_nEBufLen;
	DWORD	m_nDDataLen;
	DWORD	m_nEDataLen;
	static char m_DecodeTable[256];
	static BOOL m_Init;

//M方法
	virtual void	 AllocEncode(DWORD);
	virtual void	 AllocDecode(DWORD);
	virtual void	 SetEncodeBuffer(const PBYTE pBuffer, DWORD nBufLen);
	virtual void	 SetDecodeBuffer(const PBYTE pBuffer, DWORD nBufLen);
	virtual void	_EncodeToBuffer(const TempBucket &Decode, PBYTE pBuffer);
	virtual ULONG	_DecodeToBuffer(const TempBucket &Decode, PBYTE pBuffer);
	virtual void	_EncodeRaw(TempBucket &, const TempBucket &);
	virtual void	_DecodeRaw(TempBucket &, const TempBucket &);
	virtual BOOL	_IsBadMimeChar(BYTE);
	void					_Init();
};


#endif //__BASE64CODER_H__