memcpy

void * memcpy(void *out, const void *in, int size)
{
    byte *pout = out;
    byte *pin = (byte *)in;
    while(size) {
        if(size >= 4) {
            *((u32*)pout) = *((u32*)pin);
            size -= 4; pout += 4; pin += 4;
        } else if(size >= 2) {
            *((u16*)pout) = *((u16*)pin);
            size -= 2; pout += 2; pin += 2;
        } else {
            *pout++ = *pin++;
            --size;
        }
    }
    return out;
}