1 /*
 2  * Copyright (c) 2014, 2019, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  */
23 package org.openjdk.asmtools.asmutils;
24 
25 /**
26  *
27  */
28 public class HexUtils {
29     /*======================================================== Hex */
30 
31     private static final String hexString = "0123456789ABCDEF";
32     private static final char hexTable[] = hexString.toCharArray();
33 
34     public static String toHex(long val, int width) {
35         StringBuffer sb = new StringBuffer();
36         for (int i = width - 1; i >= 0; i--) {
37             sb.append(hexTable[((int) (val >> (4 * i))) & 0xF]);
38         }
39         String s = sb.toString();
40         return "0x" + (s.isEmpty() ? "0" : s);
41     }
42 
43     public static String toHex(long val) {
44         int width;
45         for (width = 16; width > 0; width--) {
46             if ((val >> (width - 1) * 4) != 0) {
47                 break;
48             }
49         }
50         return toHex(val, width);
51     }
52 
53     public static String toHex(int val) {
54         int width;
55         for (width = 8; width > 0; width--) {
56             if ((val >> (width - 1) * 4) != 0) {
57                 break;
58             }
59         }
60         return toHex(val, width);
61     }
62 
63 }