Windows C++ / Performing Code Checksum

Code

DWORD CalcFuncCrc(PUCHAR funcBegin, PUCHAR funcEnd)
{
    DWORD crc = 0;
    for (; funcBegin < funcEnd; ++funcBegin)
    {
        crc += *funcBegin;
    }
    return crc;
}
#pragma auto_inline(off)
VOID DebuggeeFunction()
{
    int calc = 0;
    calc += 2;
    calc <<= 8;
    calc -= 3;
}
VOID DebuggeeFunctionEnd()
{
};
#pragma auto_inline(on)
DWORD g_origCrc = 0x2bd0;
int main()
{
    DWORD crc = CalcFuncCrc((PUCHAR)DebuggeeFunction, (PUCHAR)DebuggeeFunctionEnd);
    if (g_origCrc != crc)
    {
        std::cout << "Stop debugging program!" << std::endl;
        exit(-1);
    }
    return 0;
} It was originally published on https://www.apriorit.com/