ZeroMemory

VOID ImplZeroMemory1(PVOID Destination, SIZE_T Size)
{
    PBYTE Dest = (PBYTE)Destination;
    while (Size--)
    {
        *Dest++ = 0;
    }
}

VOID ImplZeroMemory2(PVOID Destination, SIZE_T Size)
{
    PCHAR Pointer = (PCHAR)Destination;
    PCHAR End = Pointer + Size;

    for (;;)
    {
        if (Pointer >= End) break; *Pointer++ = 0;
        if (Pointer >= End) break; *Pointer++ = 0;
        if (Pointer >= End) break; *Pointer++ = 0;
        if (Pointer >= End) break; *Pointer++ = 0;
    }
}

VOID ImplZeroMemory3(PVOID Destination, SIZE_T Size)
{
    PBYTE Dest = (PBYTE)Destination;

    while (Size >= sizeof(ULONG64))
    {
        *(PULONG64)Dest = 0;
        Dest += sizeof(ULONG64);
        Size -= sizeof(ULONG64);
    }

    while (Size--)
        *Dest++ = 0;
}

VOID ImplZeroMemory4(PVOID Destination, SIZE_T Size)
{
    PBYTE Dest = (PBYTE)Destination;

    for (SIZE_T i = 0; i < Size; i++)
        Dest[i] = 0;
}

VOID ImplZeroMemory5(PVOID Destination, SIZE_T Size)
{
    PBYTE p = (PBYTE)Destination;
    PBYTE end = p + Size;

    while (p < end)
        *p++ = 0;
}

VOID ImplZeroMemory6(PVOID Destination, SIZE_T Size)
{
    PBYTE Dest = (PBYTE)Destination;

    while (Size >= 8)
    {
        Dest[0] = 0;
        Dest[1] = 0;
        Dest[2] = 0;
        Dest[3] = 0;
        Dest[4] = 0;
        Dest[5] = 0;
        Dest[6] = 0;
        Dest[7] = 0;
        Dest += 8;
        Size -= 8;
    }

    while (Size--)
        *Dest++ = 0;
}

VOID ImplZeroMemory7(PVOID Destination, SIZE_T Size)
{
    PBYTE Dest = (PBYTE)Destination;

    while (Size && ((ULONG_PTR)Dest & 7))
    {
        *Dest++ = 0;
        Size--;
    }

    while (Size >= sizeof(ULONG64))
    {
        *(PULONG64)Dest = 0;
        Dest += sizeof(ULONG64);
        Size -= sizeof(ULONG64);
    }

    while (Size--)
        *Dest++ = 0;
}