vxunderground-VX-API/VX-API/HashStringRotr32.cpp

#include "Win32Helper.h"

UINT32 HashStringRotr32SubA(UINT32 Value, UINT Count)
{
	DWORD Mask = (CHAR_BIT * sizeof(Value) - 1);
	Count &= Mask;
#pragma warning( push )
#pragma warning( disable : 4146)
	return (Value >> Count) | (Value << ((-Count) & Mask));
#pragma warning( pop ) 
}

INT HashStringRotr32A(_In_ PCHAR String)
{
	INT Value = 0;

	for (INT Index = 0; Index < StringLengthA(String); Index++)
		Value = String[Index] + HashStringRotr32SubA(Value, 7);

	return Value;
}

UINT32 HashStringRotr32SubW(UINT32 Value, UINT Count)
{
	DWORD Mask = (CHAR_BIT * sizeof(Value) - 1);
	Count &= Mask;
#pragma warning( push )
#pragma warning( disable : 4146)
	return (Value >> Count) | (Value << ((-Count) & Mask));
#pragma warning( pop ) 
}

INT HashStringRotr32W(_In_ PWCHAR String)
{
	INT Value = 0;

	for (INT Index = 0; Index < StringLengthW(String); Index++)
		Value = String[Index] + HashStringRotr32SubW(Value, 7);

	return Value;
}