2 * Copyright (C) 2018 "IoT.bzh"
3 * Author: José Bollo <jose.bollo@iot.bzh>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
21 * Returns a tiny hash value for the 'text'.
23 * Tiny hash function inspired from pearson
25 uint8_t pearson4(const char *text)
27 static uint8_t T[16] = {
28 4, 1, 6, 0, 9, 14, 11, 5,
29 2, 3, 12, 15, 10, 7, 8, 13
33 for (r = 0; (c = (uint8_t)*text) ; text++) {
37 return r; // % HEADCOUNT;