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1 | /******************************************************************************* |
2 | * Copyright (c) 2011-2012 Ericsson, Ecole Polytechnique de Montreal and others | |
3 | * | |
4 | * All rights reserved. This program and the accompanying materials are made | |
5 | * available under the terms of the Eclipse Public License v1.0 which | |
6 | * accompanies this distribution, and is available at | |
7 | * http://www.eclipse.org/legal/epl-v10.html | |
8 | * | |
9 | * Contributors: Matthew Khouzam - Initial API and implementation | |
10 | * Contributors: Simon Marchi - Initial API and implementation | |
11 | *******************************************************************************/ | |
12 | ||
13 | package org.eclipse.linuxtools.ctf.core.trace; | |
14 | ||
15 | import java.util.UUID; | |
16 | ||
17 | /** | |
18 | * <b><u>Utils</u></b> | |
19 | * <p> | |
20 | * Various utilities. | |
21 | */ | |
22 | public class Utils { | |
23 | ||
24 | // ------------------------------------------------------------------------ | |
25 | // Constants | |
26 | // ------------------------------------------------------------------------ | |
27 | ||
28 | /** | |
9ac2eb62 | 29 | * CTF magic number. (sort of looks like CTF CTF CT) |
866e5b51 FC |
30 | */ |
31 | public final static int CTF_MAGIC = 0xC1FC1FC1; | |
32 | ||
33 | /** | |
9ac2eb62 | 34 | * TSDL magic number. (sort of looks like TSDL LSDT) |
866e5b51 FC |
35 | */ |
36 | public final static int TSDL_MAGIC = 0x75D11D57; | |
37 | ||
38 | /** | |
39 | * TSDL magic number length in bytes. | |
40 | */ | |
41 | public final static int TSDL_MAGIC_LEN = 4; | |
42 | ||
43 | /** | |
44 | * Directory separator on the current platform. | |
45 | */ | |
46 | public final static String SEPARATOR = System.getProperty("file.separator"); //$NON-NLS-1$ | |
47 | ||
48 | /** | |
49 | * Length in bytes of a UUID value. | |
50 | */ | |
51 | public final static int UUID_LEN = 16; | |
52 | ||
53 | // ------------------------------------------------------------------------ | |
54 | // Operations | |
55 | // ------------------------------------------------------------------------ | |
56 | ||
57 | /** | |
58 | * Unsigned long comparison. | |
59 | * | |
60 | * @param a | |
61 | * First operand. | |
62 | * @param b | |
63 | * Second operand. | |
64 | * @return -1 if a < b, 1 if a > b, 0 if a == b. | |
65 | */ | |
66 | public static int unsignedCompare(long a, long b) { | |
67 | boolean aLeftBit = (a & (1 << (Long.SIZE - 1))) != 0; | |
68 | boolean bLeftBit = (b & (1 << (Long.SIZE - 1))) != 0; | |
69 | ||
70 | if (aLeftBit && !bLeftBit) { | |
71 | return 1; | |
72 | } else if (!aLeftBit && bLeftBit) { | |
73 | return -1; | |
74 | } else { | |
75 | if (a < b) { | |
76 | return -1; | |
77 | } else if (a > b) { | |
78 | return 1; | |
79 | } else { | |
80 | return 0; | |
81 | } | |
82 | } | |
83 | } | |
84 | ||
85 | /** | |
86 | * Creates a UUID object from an array of 16 bytes. | |
87 | * | |
88 | * @param bytes | |
89 | * Array of 16 bytes. | |
90 | * @return A UUID object. | |
91 | */ | |
92 | public static UUID makeUUID(byte bytes[]) { | |
93 | long high = 0; | |
94 | long low = 0; | |
95 | ||
96 | assert (bytes.length == Utils.UUID_LEN); | |
97 | ||
98 | for (int i = 0; i < 8; i++) { | |
99 | low = (low << 8) | (bytes[i + 8] & 0xFF); | |
100 | high = (high << 8) | (bytes[i] & 0xFF); | |
101 | } | |
102 | ||
103 | UUID uuid = new UUID(high, low); | |
104 | ||
105 | return uuid; | |
106 | } | |
107 | ||
108 | } |