158 lines
4.0 KiB
C++
158 lines
4.0 KiB
C++
/*
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* (c) Copyright Ascensio System SIA 2010-2023
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*
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* This program is a free software product. You can redistribute it and/or
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* modify it under the terms of the GNU Affero General Public License (AGPL)
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* version 3 as published by the Free Software Foundation. In accordance with
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* Section 7(a) of the GNU AGPL its Section 15 shall be amended to the effect
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* that Ascensio System SIA expressly excludes the warranty of non-infringement
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* of any third-party rights.
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*
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* This program is distributed WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For
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* details, see the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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*
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* You can contact Ascensio System SIA at 20A-6 Ernesta Birznieka-Upish
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* street, Riga, Latvia, EU, LV-1050.
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*
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* The interactive user interfaces in modified source and object code versions
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* of the Program must display Appropriate Legal Notices, as required under
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* Section 5 of the GNU AGPL version 3.
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*
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* Pursuant to Section 7(b) of the License you must retain the original Product
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* logo when distributing the program. Pursuant to Section 7(e) we decline to
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* grant you any rights under trademark law for use of our trademarks.
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*
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* All the Product's GUI elements, including illustrations and icon sets, as
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* well as technical writing content are licensed under the terms of the
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* Creative Commons Attribution-ShareAlike 4.0 International. See the License
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* terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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*
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*/
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#pragma once
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#include "../OOXML/SystemUtility/File.h"
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namespace NFileWriter
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{
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class CFileWriter
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{
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public :
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virtual void Write ( BYTE* lpData, LONG64 lDataLength ) = 0;
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virtual void Flush () = 0;
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virtual void Seek(LONG64 lPosition, DWORD dwFrom = 0) = 0;
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virtual void GetPosition(ULONG64& nPos) = 0;
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virtual void GetSize(ULONG64& nLen) = 0;
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CFileWriter ()
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{
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}
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virtual ~CFileWriter ()
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{
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}
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};
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class CBufferedFileWriter : public CFileWriter
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{
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private :
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NSFile::CFileBinary m_oFile;
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LONG64 m_lBufferSize; // Размер буффера
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BYTE* m_lpBuffer; // Сам буффер
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LONG64 m_lWritePointer; // Позиция для записи данных в буффер
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public :
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CBufferedFileWriter ( std::wstring & sFileName, LONG64 lBufferSize = 10 * 1024 * 1024 ) : CFileWriter ()
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{
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if (false == m_oFile.CreateFileW(sFileName))
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{
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throw 1;
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}
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m_lBufferSize = lBufferSize;
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m_lWritePointer = 0;
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m_lpBuffer = ( BYTE* ) new BYTE[ m_lBufferSize ];
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if ( !m_lpBuffer )
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{
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throw 1;
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}
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}
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virtual ~CBufferedFileWriter ()
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{
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Flush();
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m_oFile.CloseFile();
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RELEASEARRAYOBJECTS(m_lpBuffer);
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}
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virtual void Write ( BYTE* lpData, LONG64 lDataLength )
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{
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while ( 0 < lDataLength )
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{
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LONG64 lBufferFreeLength = 0;
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while ( 0 >= ( lBufferFreeLength = m_lBufferSize - m_lWritePointer ) )
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{
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if ( false == WriteBuffer ( m_lBufferSize ) )
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throw 1;
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}
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if ( lBufferFreeLength > lDataLength )
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lBufferFreeLength = lDataLength;
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memcpy ( m_lpBuffer + m_lWritePointer, lpData, (size_t) lBufferFreeLength);
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lDataLength -= lBufferFreeLength;
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lpData = lpData + lBufferFreeLength;
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m_lWritePointer += lBufferFreeLength;
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}
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}
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virtual void Flush ()
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{
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if ( 0 < m_lWritePointer )
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{
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if ( false == WriteBuffer ( m_lWritePointer ) )
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throw 1;
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}
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}
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virtual void Seek ( LONG64 lPosition, DWORD dwFrom/* = FILE_CURRENT */)
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{
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Flush ();
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if (dwFrom == 1/*FILE_CURRENT*/)
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{
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dwFrom += (DWORD)m_oFile.GetPosition();
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}
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if (false == m_oFile.SetPosition((ULONG)lPosition))
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throw 1;
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}
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virtual void GetPosition(ULONG64& nPos)
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{
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nPos = m_oFile.GetPosition() + m_lWritePointer;
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}
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virtual void GetSize(ULONG64& nLen)
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{
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nLen = m_oFile.GetFileSize() + m_lWritePointer;
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}
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private :
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bool WriteBuffer ( LONG64 lSize )
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{
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if (false == m_oFile.WriteFile(m_lpBuffer, ( DWORD ) lSize))
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{
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return false;
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}
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m_lWritePointer = 0;
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return true;
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}
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};
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}
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