fragmentedfile.h

著名的下载软件核心Shareaza

//
// FragmentedFile.h
//
// Copyright (c) Shareaza Development Team, 2002-2004.
// 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_FRAGMENTEDFILE_H__03EF9CB6_10EC_43A5_B6E0_D74B54044B51__INCLUDED_)
#define AFX_FRAGMENTEDFILE_H__03EF9CB6_10EC_43A5_B6E0_D74B54044B51__INCLUDED_

#pragma once

#include "FileFragment.h"

class CTransferFile;
class CEDPartImporter;


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

// Attributes
protected:
	CTransferFile*	m_pFile;
	QWORD			m_nTotal;
	QWORD			m_nRemaining;
	QWORD			m_nUnflushed;
protected:
	DWORD			m_nFragments;
	CFileFragment*	m_pFirst;
	CFileFragment*	m_pLast;
	
// Operations
public:
	BOOL			Create(LPCTSTR pszFile, QWORD nLength);
	BOOL			Open(LPCTSTR pszFile);
	BOOL			Flush();
	void			Close();
	void			Clear();
	BOOL			MakeComplete();
	void			Serialize(CArchive& ar, int nVersion);
public:
	void			SetEmptyFragments(CFileFragment* pInput);
	CFileFragment*	CopyFreeFragments() const;
	CFileFragment*	CopyFilledFragments() const;
	BOOL			IsPositionRemaining(QWORD nOffset) const;
	BOOL			DoesRangeOverlap(QWORD nOffset, QWORD nLength) const;
	QWORD			GetRangeOverlap(QWORD nOffset, QWORD nLength) const;
	BOOL			WriteRange(QWORD nOffset, LPCVOID pData, QWORD nLength);
	BOOL			ReadRange(QWORD nOffset, LPVOID pData, QWORD nLength);
	QWORD			InvalidateRange(QWORD nOffset, QWORD nLength);
	
// Operations
public:
	inline BOOL IsValid() const
	{
		return ( this != NULL ) && ( m_nTotal > 0 );
	}
	
	inline BOOL IsOpen() const
	{
		return ( this != NULL ) && ( m_pFile != NULL );
	}
	
	inline QWORD GetTotal() const
	{
		return m_nTotal;
	}
	
	inline QWORD GetRemaining() const
	{
		return m_nRemaining;
	}
	
	inline QWORD GetCompleted() const
	{
		return IsValid() ? m_nTotal - m_nRemaining : 0;
	}
	
	inline CFileFragment* GetFirstEmptyFragment() const
	{
		return m_pFirst;
	}
	
	inline QWORD GetEmptyFragmentCount() const
	{
		return m_nFragments;
	}
	
	inline BOOL IsFlushNeeded() const
	{
		return ( m_pFile != NULL ) && ( m_nUnflushed > 0 );
	}

	friend class CEDPartImporter;
};


#endif // !defined(AFX_FRAGMENTEDFILE_H__03EF9CB6_10EC_43A5_B6E0_D74B54044B51__INCLUDED_)