How I can checksum Lager file !

this code anti hack skill by winhex for PR Sv!

Quote:

#include <iostream.h>
#include "stdafx.h"
#include "Antihack.h"
#include <tlhelp32.h>
#include <windows.h>
#include <stdlib.h>
#include "crc.h"

void CheckCRC32() {

CCRC32 MyCRC32;
MyCRC32.Initialize();

unsigned long ulCRC2 = MyCRC32.FileCRC("../Data/data.pak");

if(ulCRC2 != 0x9ebad964)
{
ExitProcess(0);
}

}

void Return()
{
again:
CheckCRC32();
Sleep(10000);
goto again;
}

extern "C" __declspec(dllexport) void DekaronChecksum() {
CreateThread(NULL,NULL,LPTHREAD_START_ROUTINE(Retu rn),NULL,0,0);

CheckCRC32();

}

this crc.cpp

Quote:

#ifndef _CCRC32_CPP
#define _CCRC32_CPP

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>

#include "crc.h"

void CCRC32::Initialize(void)
{
memset(&this->ulTable, 0, sizeof(this->ulTable));

// 256 values representing ASCII character codes.
for(int iCodes = 0; iCodes <= 0xFF; iCodes++)
{
this->ulTable[iCodes] = this->Reflect(iCodes, 8) << 24;

for(int iPos = 0; iPos < 8; iPos++)
{
this->ulTable[iCodes] = (this->ulTable[iCodes] << 1) ^
(this->ulTable[iCodes] & (1 << 31) ? CRC32_POLYNOMIAL : 0);
}

this->ulTable[iCodes] = this->Reflect(this->ulTable[iCodes], 32);
}
}

// Reflection is a requirement for the official CRC-32 standard.
// You can create CRCs without it, but they won't conform to the standard.

unsigned long CCRC32::Reflect(unsigned long ulReflect, char cChar)
{
unsigned long ulValue = 0;

// Swap bit 0 for bit 7 bit 1 For bit 6, etc....
for(int iPos = 1; iPos < (cChar + 1); iPos++)
{
if(ulReflect & 1) ulValue |= 1 << (cChar - iPos);
ulReflect >>= 1;
}

return ulValue;
}

unsigned long CCRC32::FileCRC(const char *sFileName)
{
unsigned long ulCRC = 0xffffffff;

FILE *fSource = NULL;
unsigned char sBuf[CRC32BUFSZ];
int iBytesRead = 0;

if( (fSource = fopen(sFileName, "rb")) == NULL)
{
return 0xffffffff;
}

do{
iBytesRead = fread(sBuf, sizeof(char), CRC32BUFSZ, fSource);
this->PartialCRC(&ulCRC, sBuf, iBytesRead);
}while(iBytesRead == CRC32BUFSZ);

fclose(fSource);

return(ulCRC ^ 0xffffffff);
}

unsigned long CCRC32::FullCRC(unsigned char *sData, unsigned long ulLength)
{
unsigned long ulCRC = 0xffffffff;
this->PartialCRC(&ulCRC, sData, ulLength);
return ulCRC ^ 0xffffffff;
}

//For Example usage example, see FileCRC().
void CCRC32::PartialCRC(unsigned long *ulInCRC, unsigned char *sData, unsigned long ulLength)
{
while(ulLength--)
{
*ulInCRC = (*ulInCRC >> 8) ^ this->ulTable[(*ulInCRC & 0xFF) ^ *sData++];
}
}

#endif

Using 32BitGen checksum data.pak!
But it's can't check data.pak lager ! > 3.5GB
What can i do it can check file lager !
Please help me !