mirror of
https://github.com/ONLYOFFICE/core.git
synced 2026-07-11 06:22:44 +08:00
76ee07f61c
Co-authored-by: Alexander Trofimov <alexander.trofimov@onlyoffice.com> Co-committed-by: Alexander Trofimov <alexander.trofimov@onlyoffice.com>
109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
/*
|
|
* Copyright (C) Ascensio System SIA, 2009-2026
|
|
*
|
|
* 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, together with the
|
|
* additional terms provided in the LICENSE file.
|
|
*
|
|
* 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: https://www.gnu.org/licenses/agpl-3.0.html
|
|
*
|
|
* You can contact Ascensio System SIA by email at info@onlyoffice.com
|
|
* or by postal mail at 20A-6 Ernesta Birznieka-Upisha Street, Riga,
|
|
* LV-1050, Latvia, European Union.
|
|
*
|
|
* The interactive user interfaces in modified versions of the Program
|
|
* are required to display Appropriate Legal Notices in accordance with
|
|
* Section 5 of the GNU AGPL version 3.
|
|
*
|
|
* No trademark rights are granted under this License.
|
|
*
|
|
* All non-code elements of the Product, including illustrations,
|
|
* icon sets, and technical writing content, are licensed under the
|
|
* Creative Commons Attribution-ShareAlike 4.0 International License:
|
|
* https://creativecommons.org/licenses/by-sa/4.0/legalcode
|
|
*
|
|
* This license applies only to such non-code elements and does not
|
|
* modify or replace the licensing terms applicable to the Program's
|
|
* source code, which remains licensed under the GNU Affero General
|
|
* Public License v3.
|
|
*
|
|
* SPDX-License-Identifier: AGPL-3.0-only
|
|
*/
|
|
|
|
#include "CalculatorCRC32.h"
|
|
|
|
CCalculatorCRC32::CCalculatorCRC32()
|
|
{
|
|
m_dwMagicWord = 0xEDB88320;
|
|
m_dwInitCrc = 0xFFFFFFFF;
|
|
m_bInitTable = false;
|
|
}
|
|
DWORD CCalculatorCRC32::Calc(BYTE const*pStream, int nSize)
|
|
{
|
|
InitCRCTable();
|
|
DWORD dwRes = m_dwInitCrc;
|
|
for (int i=0;i<nSize;i++)
|
|
{
|
|
dwRes = m_arCRCTable[(dwRes ^ pStream[i])& 0xFF] ^ (dwRes >> 8);
|
|
}
|
|
|
|
dwRes = dwRes ^ 0xFFFFFFFF;
|
|
return dwRes;
|
|
}
|
|
DWORD CCalculatorCRC32::Calc(const std::wstring &sStream)
|
|
{
|
|
InitCRCTable();
|
|
DWORD dwRes = m_dwInitCrc;
|
|
|
|
for (size_t i=0; i < sStream.length(); i++)
|
|
{
|
|
dwRes = m_arCRCTable[(dwRes ^ (BYTE)sStream[i]) & 0xFF] ^ (dwRes >> 8);
|
|
}
|
|
|
|
dwRes = dwRes ^ 0xFFFFFFFF;
|
|
return dwRes;
|
|
}
|
|
DWORD CCalculatorCRC32::CalcPartFile(const std::wstring &sFilepath)
|
|
{
|
|
DWORD dwRet = 0xFFFFFFFF;
|
|
//LPBYTE pBuffer = new BYTE[g_clFilePartSize];
|
|
//if (NULL==pBuffer)
|
|
// return dwRet;
|
|
//FILE *pFile = fopen(sFilepath, "rb");
|
|
//if (NULL==pFile)
|
|
//{
|
|
// delete [] pBuffer;
|
|
// return dwRet;
|
|
//}
|
|
|
|
//size_t nReaded = fread(pBuffer, 1, 1024, pFile);
|
|
//fclose(pFile);
|
|
|
|
//dwRet = CCalculatorCRC32::Calc(pBuffer, nReaded);
|
|
//
|
|
//delete [] pBuffer;
|
|
return dwRet;
|
|
}
|
|
void CCalculatorCRC32::InitCRCTable()
|
|
{
|
|
if (m_bInitTable)
|
|
return;
|
|
|
|
DWORD dwTemp;
|
|
for (int i = 0; i < 256; i++)
|
|
{
|
|
dwTemp = i;
|
|
for (int j = 0;j < 8;j++)
|
|
{
|
|
if (0x1==(dwTemp & 0x1))
|
|
dwTemp = (dwTemp >> 1) ^ m_dwMagicWord;
|
|
else
|
|
dwTemp = dwTemp >> 1;
|
|
}
|
|
m_arCRCTable[i] = dwTemp;
|
|
}
|
|
}
|