106 lines
2.9 KiB
C++
106 lines
2.9 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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#include "CalculatorCRC32.h"
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CCalculatorCRC32::CCalculatorCRC32()
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{
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m_dwMagicWord = 0xEDB88320;
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m_dwInitCrc = 0xFFFFFFFF;
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m_bInitTable = false;
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}
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DWORD CCalculatorCRC32::Calc(BYTE const*pStream, int nSize)
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{
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InitCRCTable();
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DWORD dwRes = m_dwInitCrc;
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for (int i=0;i<nSize;i++)
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{
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dwRes = m_arCRCTable[(dwRes ^ pStream[i])& 0xFF] ^ (dwRes >> 8);
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}
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dwRes = dwRes ^ 0xFFFFFFFF;
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return dwRes;
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}
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DWORD CCalculatorCRC32::Calc(const std::wstring &sStream)
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{
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InitCRCTable();
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DWORD dwRes = m_dwInitCrc;
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for (size_t i=0; i < sStream.length(); i++)
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{
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dwRes = m_arCRCTable[(dwRes ^ (BYTE)sStream[i]) & 0xFF] ^ (dwRes >> 8);
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}
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dwRes = dwRes ^ 0xFFFFFFFF;
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return dwRes;
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}
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DWORD CCalculatorCRC32::CalcPartFile(const std::wstring &sFilepath)
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{
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DWORD dwRet = 0xFFFFFFFF;
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//LPBYTE pBuffer = new BYTE[g_clFilePartSize];
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//if (NULL==pBuffer)
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// return dwRet;
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//FILE *pFile = fopen(sFilepath, "rb");
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//if (NULL==pFile)
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//{
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// delete [] pBuffer;
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// return dwRet;
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//}
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//size_t nReaded = fread(pBuffer, 1, 1024, pFile);
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//fclose(pFile);
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//dwRet = CCalculatorCRC32::Calc(pBuffer, nReaded);
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//
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//delete [] pBuffer;
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return dwRet;
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}
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void CCalculatorCRC32::InitCRCTable()
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{
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if (m_bInitTable)
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return;
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DWORD dwTemp;
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for (int i = 0; i < 256; i++)
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{
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dwTemp = i;
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for (int j = 0;j < 8;j++)
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{
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if (0x1==(dwTemp & 0x1))
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dwTemp = (dwTemp >> 1) ^ m_dwMagicWord;
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else
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dwTemp = dwTemp >> 1;
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}
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m_arCRCTable[i] = dwTemp;
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}
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}
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