[xxh3] Fix flaws in streaming implementation

core/hash/xxhash/streaming.odin

@@ -52,9 +52,6 @@ XXH3_128_reset_with_seed :: proc(state: ^XXH3_state, seed: XXH64_hash) -> (err:
 XXH3_64_reset_with_seed :: XXH3_128_reset_with_seed
 
 XXH3_128_update :: proc(state: ^XXH3_state, input: []u8) -> (err: Error) {
-	if len(input) < XXH3_MIDSIZE_MAX {
-		return .Error
-	}
 	return XXH3_update(state, input, XXH3_accumulate_512, XXH3_scramble_accumulator)
 }
 XXH3_64_update :: XXH3_128_update
@@ -127,6 +124,7 @@ XXH3_create_state :: proc(allocator := context.allocator) -> (res: ^XXH3_state,
 	err = nil if mem_error == nil else .Error
 
 	XXH3_init_state(state)
+	XXH3_128_reset(state)
 	return state, nil
 }
 
@@ -234,7 +232,9 @@ XXH3_update :: #force_inline proc(
 	*/
 	if state.buffered_size > 0 {
 		load_size := int(XXH3_INTERNAL_BUFFER_SIZE - state.buffered_size)
-		mem_copy(&state.buffer[state.buffered_size], &input[0], load_size)
+
+		state_ptr := rawptr(uintptr(raw_data(state.buffer[:])) + uintptr(state.buffered_size))
+		mem_copy(state_ptr, raw_data(input), load_size)
 		input = input[load_size:]
 
 		XXH3_consume_stripes(