fileblowfish.h

BlowFish算法的压缩源码

/**********************************************************************
 * Developed by;
 *	Neal Horman - [e-mail] - http://www.wanlink.com
 *	Copyright (c) 2002 Neal Horman, All Rights Reserved
 *
 * This file/code may be used, modified, and distributed, for any 
 * purpose providing that this notice and the copyright notice above
 * is left fully intact, unaltered, and any modifications, additions, 
 * or bug fixes are clearly marked as such.
 *
 * This file/code is provided "as is" with no express or implied 
 * warranty of any kind whatsoever. The author expressly accepts no 
 * liability for any possible damages incurred as a result of it's use.
 * Use it at your own risk.
 *
 * Expect bugs.
 *
 * Portions Copyright (C) Microsoft Corporation
 *
 *		RCSID:  $Id$
 *
 * DESCRIPTION:
 *		application:	BlowFishDocView Demo
 *		source module:	FileBlowFish.h
 *
 **********************************************************************/

// FileBlowFish.h: interface for the CFileBlowFish class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_FILEBLOWFISH_H__BD9474CE_BA29_4442_8E5C_B68FE4396144__INCLUDED_)
#define AFX_FILEBLOWFISH_H__BD9474CE_BA29_4442_8E5C_B68FE4396144__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "BlowFish.h"

class CFileBlowFish : public CFile  
{
public:
// Construction
	DECLARE_DYNAMIC(CFileBlowFish);

	CFileBlowFish() { MemberInit(); };
	CFileBlowFish(int hFile) : CFile(hFile) { MemberInit(); };
	CFileBlowFish(LPCTSTR lpszFileName, UINT nOpenFlags) : CFile(lpszFileName, nOpenFlags) { MemberInit(); };

// Destruction
	virtual ~CFileBlowFish();

// Overridables
	virtual BOOL Open( LPCTSTR lpszFileName, UINT nOpenFlags, CFileException* pError = NULL );

	virtual LONG Seek( LONG lOff, UINT nFrom );
	virtual DWORD GetPosition( ) const;
	virtual void SetLength( DWORD dwNewLen );

	virtual CFile *Duplicate() const;

	virtual UINT Read(void* lpBuf, UINT nCount);
	virtual void Write(const void* lpBuf, UINT nCount);
protected:
	void * GetCodecBuf(unsigned int nCount = (64 * 1024));
	void MemberInit();

	CBlowFish		m_Cypher;
	void			*m_pCodecBuf;
	unsigned int	m_CodecBufSize;
	char			m_magicCookie[8];
	BOOL			m_bFirstWrite;
	BOOL			m_bCodecIng;
};

#endif // !defined(AFX_FILEBLOWFISH_H__BD9474CE_BA29_4442_8E5C_B68FE4396144__INCLUDED_)