2016-03-12 01:20:51 +01:00
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/* Copyright (c) 2002-2012 Croteam Ltd.
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This program is free software; you can redistribute it and/or modify
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it under the terms of version 2 of the GNU General Public License as published by
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the Free Software Foundation
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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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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */
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2016-03-11 14:57:17 +01:00
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#ifndef SE_INCL_CRC_H
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#define SE_INCL_CRC_H
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#ifdef PRAGMA_ONCE
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#pragma once
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#endif
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extern ENGINE_API ULONG crc_aulCRCTable[256];
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// begin crc calculation
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inline void CRC_Start(ULONG &ulCRC) { ulCRC = 0xFFFFFFFF; };
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// add data to a crc value
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inline void CRC_AddBYTE( ULONG &ulCRC, UBYTE ub)
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{
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ulCRC = (ulCRC>>8)^crc_aulCRCTable[UBYTE(ulCRC)^ub];
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};
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inline void CRC_AddWORD( ULONG &ulCRC, UBYTE uw)
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{
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CRC_AddBYTE(ulCRC, UBYTE(uw>> 8));
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CRC_AddBYTE(ulCRC, UBYTE(uw>> 0));
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};
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inline void CRC_AddLONG( ULONG &ulCRC, ULONG ul)
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{
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CRC_AddBYTE(ulCRC, UBYTE(ul>>24));
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CRC_AddBYTE(ulCRC, UBYTE(ul>>16));
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CRC_AddBYTE(ulCRC, UBYTE(ul>> 8));
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CRC_AddBYTE(ulCRC, UBYTE(ul>> 0));
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};
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inline void CRC_AddFLOAT(ULONG &ulCRC, FLOAT f)
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{
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CRC_AddLONG(ulCRC, *(ULONG*)&f);
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};
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// add memory block to a CRC value
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inline void CRC_AddBlock(ULONG &ulCRC, UBYTE *pubBlock, ULONG ulSize)
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{
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for( INDEX i=0; i<ulSize; i++) CRC_AddBYTE( ulCRC, pubBlock[i]);
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};
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// end crc calculation
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inline void CRC_Finish(ULONG &ulCRC) { ulCRC ^= 0xFFFFFFFF; };
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#endif /* include-once check. */
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