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https://github.com/Team-Resurgent/XBMC4Xbox.git
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Rocky5
921f9fe9f8
If ever adding the XBMC4Xbox source to GitHub use "git add -f -A" or it wont add all the files.
90 lines
3.0 KiB
C++
90 lines
3.0 KiB
C++
/*
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**********************************
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**********************************
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** BROUGHT TO YOU BY: **
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**********************************
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**********************************
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** **
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** [TEAM ASSEMBLY] **
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** **
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** www.team-assembly.com **
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** **
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******************************************************************************************************
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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******************************************************************************************************
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********************************************************************************************************
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** XKCRC.CPP - General CRC Class' Implementation
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********************************************************************************************************
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**
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** Containss functions to do a simple CRC check on a block of data..
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** might be more ways of elegantly doing this, but for now this has to work...
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**
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********************************************************************************************************
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UPDATE LOG:
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--------------------------------------------------------------------------------------------------------
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Date: 02/18/2003
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By: UNDEAD [team-assembly]
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Reason: Prepared 0.2 for Public Release
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--------------------------------------------------------------------------------------------------------
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Date: 01/06/2003
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By: UNDEAD [team-assembly]
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Reason: Prepared for Public Release
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--------------------------------------------------------------------------------------------------------
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*/
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#include "XKCRC.h"
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XKCRC::XKCRC(void)
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{}
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XKCRC::~XKCRC(void)
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{}
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void XKCRC::QuickCRC(UCHAR* CRCVAL, UCHAR* inData, DWORD dataLen)
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{
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LPBYTE CRC_Data = new BYTE[dataLen + 4];
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ZeroMemory(CRC_Data, dataLen + 4);
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memcpy(CRC_Data + 0x01 , inData, dataLen - 1); //We Circle shift the whole bunch 1 byte to the right
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memcpy(CRC_Data, inData + dataLen - 1, 0x01); //We Circle shift the whole bunch 1 byte to the right
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BYTE CRCVALUE[4];
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ZeroMemory(CRCVALUE, 4);
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for (int CRCPos = 0; CRCPos < 4; CRCPos++)
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{
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WORD CRCPosVal = 0xFFFF;
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for (DWORD l = CRCPos; l < dataLen; l += 4)
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{
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LPWORD tmpWrd = (LPWORD)(&CRC_Data[l]);
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WORD ival = *tmpWrd;
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CRCPosVal = CRCPosVal - ival;
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}
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CRCPosVal &= 0xFF00;
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CRCVALUE[CRCPos] = (BYTE) (CRCPosVal >> 8);
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}
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memcpy(CRCVAL, CRCVALUE, 4);
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delete[] CRC_Data;
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}
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