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传世WPF文件读取c++源码 Delphi
单机社区 6月前 
bool CWpf::WpfOpen(const char * strPathName,__int64 iOffset,DWORD dwOpenType)
{
	if(strPathName == NULL || dwOpenType == 0)
	{
		m_eWrLastError = EWR_PARA_ERROR;
		return false;
	}

	if(m_bSaving)
	{
		m_eWrLastError = EWR_FILE_SAVING;
		return false;
	}

	//先关闭当前打开的wpf文件
	WpfClose();

	m_strWpfDir = strPathName;
	replace(m_strWpfDir.begin(),m_strWpfDir.end(),'/','\\');
	size_t iPos = m_strWpfDir.find_last_of("\\");
	if (iPos != string::npos)
	{
		m_strWpfFileName = m_strWpfDir.substr(iPos + 1,m_strWpfDir.length() - iPos - 1);
		m_strWpfDir = m_strWpfDir.substr(0,iPos);
	}
	//打开或创建文件
	errno_t err = 0;
	if (dwOpenType & EWOT_RDWR)
	{
		err = 	_sopen_s(&(m_iFileHandle[EFT_MAIN]), strPathName, _O_BINARY | _O_RDWR , _SH_DENYWR,  _S_IREAD | _S_IWRITE );
		dwOpenType |= EWOT_LISTDIR;
	}
	else
	{
		err = 	_sopen_s(&(m_iFileHandle[EFT_MAIN]), strPathName, _O_BINARY | _O_RDONLY , /*_SH_DENYWR*/_SH_DENYNO,  _S_IREAD);
		if (dwOpenType & EWOT_READONLY)
		{
			dwOpenType |= EWOT_LISTHASH;
		}
	}

	if(err != 0)
	{
		m_eWrLastError = EWR_FILE_OPEN_FAIL;
		return false;
	}

	for (int i = EFT_THREAD ; i < EFT_NUM; i ++)
	{
		err = 	_sopen_s(&(m_iFileHandle[i]), strPathName, _O_BINARY | _O_RDONLY , _SH_DENYNO,  _S_IREAD);

		if(err != 0)
		{
			m_eWrLastError = EWR_FILE_OPEN_FAIL;
			return false;
		}
	}

	m_iWpfStartPos = iOffset;
	m_WpfHeader.dwMagic = 0;//防止有些文件长度不够sizeof(S_WpfHeader),取到默认值
	m_WpfHeader_Bak.dwMagic = 0;//防止有些文件长度不够sizeof(S_WpfHeader),取到默认值
	m_WpfHeader.bySavingHeader = TRUE;//防止有些文件长度不够sizeof(S_WpfHeader),取到默认值
	m_WpfHeader_Bak.bySavingHeader = TRUE;//防止有些文件长度不够sizeof(S_WpfHeader),取到默认值

	//读入文件头
	_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos,SEEK_SET);
	_read(m_iFileHandle[EFT_MAIN],&m_WpfHeader,sizeof(S_WpfHeader));

	//读入文件头备份
	_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos + sizeof(S_WpfHeader),SEEK_SET);
	_read(m_iFileHandle[EFT_MAIN],&m_WpfHeader_Bak,sizeof(S_WpfHeader));

	if(m_WpfHeader.bySavingHeader && m_WpfHeader_Bak.bySavingHeader)//该文件在创建的时候出现异常,如断点,程序崩溃等情况,没有正常写入头
	{
		return false;
	}
	
	//如果上次文件头没有正确保存,读取必份的文件
	if (m_WpfHeader.bySavingHeader)
	{
		m_WpfHeader = m_WpfHeader_Bak;
		m_bModifyed = true;//原来没有保存好,用了备份的,那么这次即使没有修改也要重新保存
	}

	m_WpfHeader_Disk = m_WpfHeader;

	if(m_WpfHeader.dwMagic != WPF_MAGIC)
	{
		m_eWrLastError = EWR_NOT_WPF_FILE;
		WpfClose();
		return false;
	}

	m_WpfHeader.bySavingHeader = FALSE;//理论上不可能出现文件头及备份文件头m_WpfHeader.bySavingHeader同时为TRUE,还是清一下标记
	m_dwOpenType = dwOpenType;

	//如果以写方式打开要求读入空闲块描述信息
	if ((m_dwOpenType & EWOT_RDWR) && m_WpfHeader.dwBlankBlockSize > 0)
	{
		PBlankBlock pBlock = new BlankBlock[m_WpfHeader.dwBlankBlockSize];
		_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos + m_WpfHeader.iBlankBlockPos,SEEK_SET);
		_read(m_iFileHandle[EFT_MAIN],pBlock,m_WpfHeader.dwBlankBlockSize * sizeof(BlankBlock));

		PBlankBlock p = pBlock;
		PBlankBlockNode pList = NULL,pList2 = NULL;

		pList = new BlankBlockNode();
		pList->blankBlock.dwStart = p->dwStart;
		pList->blankBlock.dwSize = p->dwSize;
		pList->pParent = NULL;
		pList->pNext = NULL;
		m_pBlankBlockList = pList;
		pList2 = pList;
		p ++;

		for (DWORD i = 1; i < m_WpfHeader.dwBlankBlockSize; i++,p++)
		{
			pList = new BlankBlockNode();
			pList->blankBlock.dwStart = p->dwStart;
			pList->blankBlock.dwSize = p->dwSize;
			pList->pParent = pList2;
			pList2->pNext = pList;
			pList2 = pList;
		}

		pList2->pNext = NULL;

		SAFE_DELETE_ARRAY(pBlock);
	}

	//载入文件分配表
	return WpfLoadFat();	
}


bool CWpf::WpfLoadFat()
{
	if(!IsOpenWpfFile())
	{
		m_eWrLastError = EWR_FILE_NOT_OPEN;
		return false;
	}

	if(m_WpfHeader.dwDirCount < 1)
	{
		m_eWrLastError = EWR_NOT_WPF_FILE;
		return false;
	}

	_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos + m_WpfHeader.iFatPos,SEEK_SET);

	DWORD dwCount = m_WpfHeader.dwDirCount + m_WpfHeader.dwFileCount;

	if (m_bSpeedPrior)
	{
		m_pFcb1List = new FCB1[dwCount];
		_read(m_iFileHandle[EFT_MAIN],m_pFcb1List,dwCount * FCB1_SIZE);

		if (m_dwOpenType & EWOT_LISTHASH)
		{
			//hash map
			PFCB1 pfcb1 = m_pFcb1List;
			for (DWORD i = 0; i < dwCount; i++,pfcb1++)
			{
#ifdef _DEBUG
				if (pfcb1->iHashKey != 0 && m_MhashFcb1.find(pfcb1->iHashKey) != m_MhashFcb1.end())
				{
					int i = 3;
				}
#endif
				if (pfcb1->iHashKey != 0)
				{
					m_MhashFcb1[pfcb1->iHashKey] = pfcb1;
				}
			}
		}	


		if (m_dwOpenType & EWOT_LISTDIR)//要求构造目录结构
		{
			m_pFcb2List = new FCB2[dwCount];
			_read(m_iFileHandle[EFT_MAIN],m_pFcb2List,dwCount * FCB2_SIZE);

			m_pFcbList = new FCB[dwCount];
			memset(m_pFcbList,0,dwCount * sizeof(FCB));

			m_pDirList = new WpfFileList[m_WpfHeader.dwDirCount];

			//递归构造目录
			vector<PWpfFileList> VDirs;
			m_pWpfRoot = &(m_pDirList[0]);
			m_pWpfRoot->pfcb = &(m_pFcbList[0]);
			m_pWpfRoot->pfcb->pfcb1 = &(m_pFcb1List[0]);
			m_pWpfRoot->pfcb->pfcb2 = &(m_pFcb2List[0]);
			VDirs.push_back(m_pWpfRoot);

			DWORD dwDirNo = 1,dwPos = 0;
			PWpfFileList pFront = NULL;
			while(!VDirs.empty())
			{
				pFront = VDirs.front();

				dwPos = pFront->pfcb->pfcb1->dwStart;
				for (DWORD i = 0; i < pFront->pfcb->pfcb1->dwSize; i++,dwPos++)
				{
					PFCB2 fcb2 = &(m_pFcb2List[dwPos]);
					if(fcb2->dwAttribute & EFA_DIR)
					{
						PWpfFileList sublist = &(m_pDirList[dwDirNo]);
						dwDirNo ++;
						PFCB newfcb = &(m_pFcbList[dwPos]);
						newfcb->pfcb1 = &(m_pFcb1List[dwPos]);
						newfcb->pfcb2 = &(m_pFcb2List[dwPos]);
						newfcb->pParent = pFront;
						sublist->pfcb = newfcb;

						VDirs.push_back(sublist);
						pFront->MDirs[fcb2->strName] = sublist;

					}
					else if (fcb2->dwAttribute & EFA_FILE)
					{
						PFCB newfcb = &(m_pFcbList[dwPos]);
						newfcb->pfcb1 = &(m_pFcb1List[dwPos]);
						newfcb->pfcb2 = &(m_pFcb2List[dwPos]);
						newfcb->pParent = pFront;

						pFront->MFiles[fcb2->strName] = newfcb;

						if (m_dwOpenType & EWOT_LISTFCBHASH)
						{
							m_MhashFcb[newfcb->pfcb1->iHashKey] = newfcb;
						}
					}
				}

				VDirs.erase(VDirs.begin());
			}
		}

	}
	else
	{
		m_pFcb1List = NULL;
		m_pFcb2List = NULL;
		m_pFcbList = NULL;
		m_pDirList = NULL;

		
		if (m_dwOpenType & EWOT_LISTHASH)
		{
			for (DWORD index = 0; index < dwCount; index ++)
			{
				PFCB1 pfcb1 = new FCB1();
				_read(m_iFileHandle[EFT_MAIN],pfcb1,FCB1_SIZE);

				//hash map
#ifdef _DEBUG
				if (pfcb1->iHashKey != 0 && m_MhashFcb1.find(pfcb1->iHashKey) != m_MhashFcb1.end())
				{
					int i = 3;
				}
#endif
				if (pfcb1->iHashKey != 0)
				{
					m_MhashFcb1[pfcb1->iHashKey] = pfcb1;
				}
			}
		}

		if (m_dwOpenType & EWOT_LISTDIR)//要求构造目录结构
		{
			//递归构造目录
			vector<PWpfFileList> VDirs;
			m_pWpfRoot = new WpfFileList();
			m_pWpfRoot->pfcb = new FCB();
			m_pWpfRoot->pfcb->pfcb1 = new FCB1();
			m_pWpfRoot->pfcb->pfcb2 = new FCB2();
			VDirs.push_back(m_pWpfRoot);

			//读取第一个根目录
			_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos + m_WpfHeader.iFatPos,SEEK_SET);
			_read(m_iFileHandle[EFT_MAIN],m_pWpfRoot->pfcb->pfcb1,FCB1_SIZE);

			_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos + m_WpfHeader.iFatPos + dwCount * FCB1_SIZE,SEEK_SET);
			_read(m_iFileHandle[EFT_MAIN],m_pWpfRoot->pfcb->pfcb2,FCB2_SIZE);

		
			PWpfFileList pFront = NULL;
			while(!VDirs.empty())
			{
				pFront = VDirs.front();

				for (DWORD dwPos = pFront->pfcb->pfcb1->dwStart; dwPos < pFront->pfcb->pfcb1->dwStart + pFront->pfcb->pfcb1->dwSize; dwPos++)
				{
					PFCB2 fcb2 = new FCB2();
					//读取这一条fcb2
					_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos + m_WpfHeader.iFatPos + dwCount * FCB1_SIZE + dwPos * FCB2_SIZE,SEEK_SET);
					_read(m_iFileHandle[EFT_MAIN],fcb2,FCB2_SIZE);

					if(fcb2->dwAttribute & EFA_DIR)
					{
						PFCB newfcb = new FCB();
						newfcb->pfcb1 = new FCB1();
					    //读取这一条fcb1
						_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos + m_WpfHeader.iFatPos + dwPos * FCB1_SIZE,SEEK_SET);
						_read(m_iFileHandle[EFT_MAIN],newfcb->pfcb1,FCB1_SIZE);

						PWpfFileList sublist = new WpfFileList();

						newfcb->pfcb2 = fcb2;
						newfcb->pParent = pFront;
						sublist->pfcb = newfcb;

						VDirs.push_back(sublist);
						pFront->MDirs[fcb2->strName] = sublist;
					}
					else if (fcb2->dwAttribute & EFA_FILE)
					{
						PFCB newfcb = new FCB();
						newfcb->pfcb1 = new FCB1();
						//读取这一条fcb1
						_lseeki64(m_iFileHandle[EFT_MAIN],m_iWpfStartPos + m_WpfHeader.iFatPos + dwPos * FCB1_SIZE,SEEK_SET);
						_read(m_iFileHandle[EFT_MAIN],newfcb->pfcb1,FCB1_SIZE);

						newfcb->pfcb2 = fcb2;
						newfcb->pParent = pFront;

						pFront->MFiles[fcb2->strName] = newfcb;

						if (m_dwOpenType & EWOT_LISTFCBHASH)
						{
							m_MhashFcb[newfcb->pfcb1->iHashKey] = newfcb;
						}
					}
				}

				VDirs.erase(VDirs.begin());
			}
		}

	}



	return true;
}
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