* @todo Perhaps get rid of md and just pass in the address each time.
* Very slightly clearer and slower.
**/
-void sum_update(char *p, int32 len)
+void sum_update(const char *p, int32 len)
{
if (len + sumresidue < CSUM_CHUNK) {
memcpy(sumrbuf + sumresidue, p, len);