init repo

ActiveX/Common/FileWriter.h

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+/*
+ * (c) Copyright Ascensio System SIA 2010-2014
+ *
+ * This program is a free software product. You can redistribute it and/or 
+ * modify it under the terms of the GNU Affero General Public License (AGPL) 
+ * version 3 as published by the Free Software Foundation. In accordance with 
+ * Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect 
+ * that Ascensio System SIA expressly excludes the warranty of non-infringement
+ * of any third-party rights.
+ *
+ * This program is distributed WITHOUT ANY WARRANTY; without even the implied 
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For 
+ * details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
+ *
+ * You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia,
+ * EU, LV-1021.
+ *
+ * The  interactive user interfaces in modified source and object code versions
+ * of the Program must display Appropriate Legal Notices, as required under 
+ * Section 5 of the GNU AGPL version 3.
+ *
+ * Pursuant to Section 7(b) of the License you must retain the original Product
+ * logo when distributing the program. Pursuant to Section 7(e) we decline to
+ * grant you any rights under trademark law for use of our trademarks.
+ *
+ * All the Product's GUI elements, including illustrations and icon sets, as
+ * well as technical writing content are licensed under the terms of the
+ * Creative Commons Attribution-ShareAlike 4.0 International. See the License
+ * terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
+ *
+ */
+ #pragma once
+
+namespace NFileWriter
+{
+	
+	
+	
+	
+	
+
+	class CFileWriter
+	{
+	public :
+
+		
+		virtual VOID Write ( LPBYTE lpData, LONG64 lDataLength ) = 0;
+		
+		virtual VOID Flush () = 0;
+		
+		virtual VOID Seek ( LONG64 lPosition, DWORD dwFrom = FILE_CURRENT ) = 0;
+		
+		virtual VOID GetPosition(ULONGLONG& nPos) = 0;
+		
+		virtual VOID GetSize(ULONGLONG& nLen) = 0;
+
+	public :
+
+		
+		CFileWriter ()
+		{
+		}
+		
+		virtual ~CFileWriter ()
+		{
+		}
+	};
+
+	
+	
+	
+	
+	
+
+	class CBufferedFileWriter : public CFileWriter
+	{
+	private :
+
+		HANDLE m_hFile;									
+
+		LONG64 m_lBufferSize;							
+
+		LPBYTE m_lpBuffer;								
+
+		LONG64 m_lWritePointer;							
+
+	public :
+
+		
+		CBufferedFileWriter ( TCHAR *lpszFile, LONG64 lBufferSize = 10 * 1024 * 1024 ) : CFileWriter ()
+		{
+			
+			m_hFile = CreateFile (lpszFile, GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL );
+
+			
+			if ( INVALID_HANDLE_VALUE == m_hFile )
+			{
+				
+				throw 1;
+			}
+
+			
+			m_lBufferSize		= lBufferSize;
+
+			
+			m_lWritePointer		= 0;
+
+			
+			m_lpBuffer = ( LPBYTE ) ::HeapAlloc ( GetProcessHeap (), HEAP_ZERO_MEMORY, (size_t) m_lBufferSize );
+
+			
+			if ( !m_lpBuffer )
+			{
+				
+				throw 1;
+			}
+
+			
+		}
+
+		
+		virtual ~CBufferedFileWriter ()
+		{
+			
+			if ( m_hFile && m_hFile != INVALID_HANDLE_VALUE )
+			{
+				
+				try
+				{
+					
+					Flush ();
+				}
+				catch ( ... )
+				{
+				}
+				CloseHandle ( m_hFile );
+				m_hFile = NULL;
+			}
+
+			
+			if ( m_lpBuffer )
+			{
+				::HeapFree ( GetProcessHeap (), 0, m_lpBuffer );
+				m_lpBuffer = NULL;
+			}
+		}
+		
+		virtual VOID Write ( LPBYTE lpData, LONG64 lDataLength )
+		{
+			
+			while ( 0 < lDataLength )
+			{
+				
+				LONG64 lBufferFreeLength = 0;
+
+				
+				while ( 0 >= ( lBufferFreeLength = m_lBufferSize - m_lWritePointer ) )
+				{
+					
+					if ( FALSE == WriteBuffer ( m_lBufferSize ) )
+						throw 1;
+				}
+
+				
+				if ( lBufferFreeLength > lDataLength )
+					lBufferFreeLength = lDataLength;
+
+				
+				memcpy ( m_lpBuffer + m_lWritePointer, lpData, (size_t) lBufferFreeLength);
+
+				
+				lDataLength -= lBufferFreeLength;
+				
+				lpData = lpData + lBufferFreeLength;
+				
+				m_lWritePointer += lBufferFreeLength;
+			}
+		}
+		
+		virtual VOID Flush ()
+		{
+			
+			if ( 0 < m_lWritePointer )
+			{
+				
+				if ( FALSE == WriteBuffer ( m_lWritePointer ) )
+					throw 1;
+			}
+		}
+		
+		virtual VOID Seek ( LONG64 lPosition, DWORD dwFrom = FILE_CURRENT )
+		{
+
+			
+			Flush ();
+
+			
+			LARGE_INTEGER liOffset;
+			liOffset.QuadPart = lPosition;
+			DWORD nNewPos = ::SetFilePointer(m_hFile, liOffset.LowPart, &liOffset.HighPart, dwFrom);
+			
+			if (nNewPos == INVALID_SET_FILE_POINTER)
+			{
+				HRESULT hr;
+
+				hr = AtlHresultFromLastError();
+				if (FAILED(hr))
+					throw 1;
+			}
+
+		}
+		
+		virtual VOID GetPosition(ULONGLONG& nPos)
+		{
+			nPos=0;
+			if(m_hFile == NULL)return;
+
+			LARGE_INTEGER liOffset;
+			liOffset.QuadPart = 0;
+			liOffset.LowPart = ::SetFilePointer(m_hFile, 0, &liOffset.HighPart, FILE_CURRENT);
+			if (liOffset.LowPart == INVALID_SET_FILE_POINTER)
+			{
+				HRESULT hr;
+
+				hr = AtlHresultFromLastError();
+				if (FAILED(hr))
+					throw 1;
+			}
+			nPos = liOffset.QuadPart + m_lWritePointer;
+		}
+		
+		virtual void GetSize(ULONGLONG& nLen) 
+		{
+			nLen=0;
+			if(m_hFile == NULL)return;
+			
+			LARGE_INTEGER liOffset;
+			ULARGE_INTEGER liFileSize;
+			
+			liOffset.QuadPart = 0;
+			liOffset.LowPart = ::SetFilePointer(m_hFile, 0, &liOffset.HighPart, FILE_CURRENT);
+
+			liFileSize.LowPart = ::GetFileSize(m_hFile, &liFileSize.HighPart);
+			
+			if (liFileSize.LowPart == INVALID_FILE_SIZE || liOffset.LowPart == INVALID_SET_FILE_POINTER)
+			{
+				HRESULT hr;
+
+				hr = AtlHresultFromLastError();
+				if (FAILED(hr))
+					throw 1;
+			}
+
+			nLen = liFileSize.QuadPart;
+
+			if (liFileSize.QuadPart==liOffset.QuadPart) 
+			{
+				nLen += m_lWritePointer;
+			}
+		}
+	private :
+
+		
+		BOOL WriteBuffer ( LONG64 lSize )
+		{
+			
+			if ( INVALID_HANDLE_VALUE == m_hFile || 0 == lSize )
+				return FALSE;
+
+			
+			DWORD dwBytesWrite = 0;
+
+			
+			if ( !WriteFile ( m_hFile, m_lpBuffer, ( DWORD ) lSize, &dwBytesWrite, NULL ) )
+			{
+				
+				return FALSE;
+			}
+
+			
+			if ( ( LONG64 ) dwBytesWrite != lSize )
+				return FALSE;
+
+			
+			m_lWritePointer = 0;
+			return TRUE;
+		}
+	};
+}