File indexing completed on 2024-11-24 04:54:36 

0001 /*
0002     SPDX-License-Identifier: MPL-2.0
0003 */
0004 
0005 /* Copyright (c) 2015 Brian R. Bondy. Distributed under the MPL2 license.
0006  * This Source Code Form is subject to the terms of the Mozilla Public
0007  * License, v. 2.0. If a copy of the MPL was not distributed with this
0008  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
0009 
0010 #include "./hashFn.h"
0011 
0012 uint64_t HashFn::operator()(const char *input, int len,
0013     unsigned char lastCharCode, uint64_t lastHash) {
0014     // See the abracadabra example:
0015     // https://en.wikipedia.org/wiki/Rabin%E2%80%93Karp_algorithm
0016     return (lastHash - lastCharCode *
0017       customPow(&precomputedPowers, precompute, p, len - 1)) *
0018       p + input[len - 1];
0019 }
0020 
0021 uint64_t HashFn::operator()(const char *input, int len) {
0022     uint64_t total = 0;
0023     for (int i = 0; i < len; i++) {
0024       total += input[i] *
0025         customPow(&precomputedPowers, precompute, p, len - i - 1);
0026     }
0027     return total;
0028 }