1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0
10 *
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.
16 */
17
18 package org.apache.commons.codec.digest;
19
20 /**
21 * Commons implementation methods for MurmurHash* classes in this package.
22 */
23 final class MurmurHash {
24
25 /**
26 * Gets the little-endian int from 4 bytes starting at the specified index.
27 *
28 * @param data The data
29 * @param index The index
30 * @return The little-endian int
31 */
32 static int getLittleEndianInt(final byte[] data, final int index) {
33 // @formatter:off
34 return data[index ] & 0xff |
35 (data[index + 1] & 0xff) << 8 |
36 (data[index + 2] & 0xff) << 16 |
37 (data[index + 3] & 0xff) << 24;
38 // @formatter:on
39 }
40
41 /**
42 * Gets the little-endian long from 8 bytes starting at the specified index.
43 *
44 * @param data The data
45 * @param index The index
46 * @return The little-endian long
47 */
48 static long getLittleEndianLong(final byte[] data, final int index) {
49 // @formatter:off
50 return (long) data[index ] & 0xff |
51 ((long) data[index + 1] & 0xff) << 8 |
52 ((long) data[index + 2] & 0xff) << 16 |
53 ((long) data[index + 3] & 0xff) << 24 |
54 ((long) data[index + 4] & 0xff) << 32 |
55 ((long) data[index + 5] & 0xff) << 40 |
56 ((long) data[index + 6] & 0xff) << 48 |
57 ((long) data[index + 7] & 0xff) << 56;
58 // @formatter:on
59 }
60 }