1 /*
2 * #%L
3 * EndianUtils.java - mongodb-async-driver - Allanbank Consulting, Inc.
4 * %%
5 * Copyright (C) 2011 - 2014 Allanbank Consulting, Inc.
6 * %%
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * #L%
19 */
20 package com.allanbank.mongodb.bson.io;
21
22 /**
23 * Utilities to deal with integer endian differences.
24 *
25 * @api.no This class is <b>NOT</b> part of the drivers API. This class may be
26 * mutated in incompatible ways between any two releases of the driver.
27 * @copyright 2011-2013, Allanbank Consulting, Inc., All Rights Reserved
28 */
29 public final class EndianUtils {
30 /**
31 * Performs a byte-order swap for a 32-bit signed integer.
32 *
33 * @param value
34 * The value to swap.
35 * @return The swapped value.
36 */
37 public static int swap(final int value) {
38 return (((value << 24) & 0xFF000000) | ((value << 8) & 0x00FF0000)
39 | ((value >> 8) & 0x0000FF00) | ((value >> 24) & 0x000000FF));
40 }
41
42 /**
43 * Performs a byte-order swap for a 64-bit signed integer.
44 *
45 * @param value
46 * The value to swap.
47 * @return The swapped value.
48 */
49 public static long swap(final long value) {
50 return (((value << 56) & 0xFF00000000000000L)
51 | ((value << 40) & 0x00FF000000000000L)
52 | ((value << 24) & 0x0000FF0000000000L)
53 | ((value << 8) & 0x000000FF00000000L)
54 | ((value >> 8) & 0x00000000FF000000L)
55 | ((value >> 24) & 0x0000000000FF0000L)
56 | ((value >> 40) & 0x000000000000FF00L) | ((value >> 56) & 0x00000000000000FFL));
57 }
58
59 }