/* Copyright (c) 2002-2012 Croteam Ltd. This program is free software; you can redistribute it and/or modify it under the terms of version 2 of the GNU General Public License as published by the Free Software Foundation This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifndef SE_INCL_CRC_H #define SE_INCL_CRC_H #ifdef PRAGMA_ONCE #pragma once #endif extern ENGINE_API ULONG crc_aulCRCTable[256]; // begin crc calculation inline void CRC_Start(ULONG &ulCRC) { ulCRC = 0xFFFFFFFF; }; // add data to a crc value inline void CRC_AddBYTE( ULONG &ulCRC, UBYTE ub) { ulCRC = (ulCRC>>8)^crc_aulCRCTable[UBYTE(ulCRC)^ub]; }; inline void CRC_AddWORD( ULONG &ulCRC, UWORD uw) { CRC_AddBYTE(ulCRC, UBYTE(uw>> 8)); CRC_AddBYTE(ulCRC, UBYTE(uw>> 0)); }; inline void CRC_AddLONG( ULONG &ulCRC, ULONG ul) { CRC_AddBYTE(ulCRC, UBYTE(ul>>24)); CRC_AddBYTE(ulCRC, UBYTE(ul>>16)); CRC_AddBYTE(ulCRC, UBYTE(ul>> 8)); CRC_AddBYTE(ulCRC, UBYTE(ul>> 0)); }; inline void CRC_AddLONGLONG( ULONG &ulCRC, __uint64 x) { CRC_AddBYTE(ulCRC, UBYTE(x>>56)); CRC_AddBYTE(ulCRC, UBYTE(x>>48)); CRC_AddBYTE(ulCRC, UBYTE(x>>40)); CRC_AddBYTE(ulCRC, UBYTE(x>>32)); CRC_AddBYTE(ulCRC, UBYTE(x>>24)); CRC_AddBYTE(ulCRC, UBYTE(x>>16)); CRC_AddBYTE(ulCRC, UBYTE(x>> 8)); CRC_AddBYTE(ulCRC, UBYTE(x>> 0)); } inline void CRC_AddFLOAT(ULONG &ulCRC, FLOAT f) { CRC_AddLONG(ulCRC, *(ULONG*)&f); }; // add memory block to a CRC value inline void CRC_AddBlock(ULONG &ulCRC, UBYTE *pubBlock, ULONG ulSize) { for( INDEX i=0; (ULONG)i<ulSize; i++) CRC_AddBYTE( ulCRC, pubBlock[i]); }; // end crc calculation inline void CRC_Finish(ULONG &ulCRC) { ulCRC ^= 0xFFFFFFFF; }; // in 32bit mode, it just returns iPtr ULONG, // in 64bit mode it returns the CRC hash of iPtr (or 0 if ptr == NULL) // so either way you should get a value that very likely uniquely identifies the pointer inline ULONG IntPtrToID(size_t iPtr) { #if PLATFORM_32BIT return (ULONG)iPtr; #else // in case the code relies on 0 having special meaning because of NULL-pointers... if(iPtr == 0) return 0; ULONG ret; CRC_Start(ret); CRC_AddLONGLONG(ret, iPtr); CRC_Finish(ret); return ret; #endif } // in 32bit mode, it just returns the pointer's address as ULONG, // in 64bit mode it returns the CRC hash of the pointer's address (or 0 if ptr == NULL) // so either way you should get a value that very likely uniquely identifies the pointer inline ULONG PointerToID(void* ptr) { #if PLATFORM_32BIT return (ULONG)(size_t)ptr; #else return IntPtrToID((size_t)ptr); #endif } #endif /* include-once check. */