CopyMemory

Custom implementation of CopyMemory.

PVOID CopyMemoryEx(PVOID Destination, CONST PVOID Source, SIZE_T Length)
{
    PBYTE D = (PBYTE)Destination;
    PBYTE S = (PBYTE)Source;

    while (Length--)
        *D++ = *S++;

    return Destination;
}

PVOID CopyMemoryEx2(PVOID Destination, CONST PVOID Source, SIZE_T Length)
{
    PBYTE D = (PBYTE)Destination;
    PBYTE S = (PBYTE)Source;

    if (((ULONG_PTR)D & 7) == 0 && ((ULONG_PTR)S & 7) == 0)
    {
        while (Length >= sizeof(ULONG64))
        {
            *(PULONG64)D = *(PULONG64)S;
            D += sizeof(ULONG64);
            S += sizeof(ULONG64);
            Length -= sizeof(ULONG64);
        }
    }

    while (Length--)
        *D++ = *S++;

    return Destination;
}

PVOID CopyMemoryEx3(PVOID Destination, CONST PVOID Source, SIZE_T Length)
{
    PBYTE D = (PBYTE)Destination;
    PBYTE S = (PBYTE)Source;
    SIZE_T Size = Length;

    while (Size >= 4)
    {
        D[0] = S[0];
        D[1] = S[1];
        D[2] = S[2];
        D[3] = S[3];
        D += 4; S += 4;
        Size -= 4;
    }

    while (Size--)
        *D++ = *S++;

    return Destination;
}