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Java > Open Source Codes > com > sun > jmx > snmp > internal > SnmpTools


1 /*
2  * @(#)file SnmpTools.java
3  * @(#)author Sun Microsystems, Inc.
4  * @(#)version 1.15
5  * @(#)date 08/02/09
6  *
7  * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
8  * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
9  *
10  */
11 package com.sun.jmx.snmp.internal;
12
13 import com.sun.jmx.snmp.SnmpDefinitions;
14 /**
15  * Utility class used to deal with various data representations.
16  * <p><b>This API is a Sun Microsystems internal API and is subject
17  * to change without notice.</b></p>
18  * @since 1.5
19  */
20 public class SnmpTools implements SnmpDefinitions {
21
22     /**
23      * Translates a binary representation in an ASCII one. The returned string is an hexadecimal string starting with 0x.
24      * @param data Binary to translate.
25      * @return Translated binary.
26      */
27     static public String JavaDoc binary2ascii(byte[] data, int length)
28     {
29     if(data == null) return null;
30     final int size = (length * 2) + 2;
31     byte[] asciiData = new byte[size];
32     asciiData[0] = (byte) '0';
33     asciiData[1] = (byte) 'x';
34     for (int i=0; i < length; i++) {
35         int j = i*2;
36         int v = (data[i] & 0xf0);
37         v = v >> 4;
38         if (v < 10)
39         asciiData[j+2] = (byte) ('0' + v);
40         else
41         asciiData[j+2] = (byte) ('A' + (v - 10));
42         v = ((data[i] & 0xf));
43         if (v < 10)
44         asciiData[j+1+2] = (byte) ('0' + v);
45         else
46         asciiData[j+1+2] = (byte) ('A' + (v - 10));
47     }
48     return new String JavaDoc(asciiData);
49     }
50     
51     /**
52      * Translates a binary representation in an ASCII one. The returned string is an hexadecimal string starting with 0x.
53      * @param data Binary to translate.
54      * @return Translated binary.
55      */
56     static public String JavaDoc binary2ascii(byte[] data)
57     {
58     return binary2ascii(data, data.length);
59     }
60     /**
61      * Translates a stringified representation in a binary one. The passed string is an hexadecimal one starting with 0x.
62      * @param str String to translate.
63      * @return Translated string.
64      */
65     static public byte[] ascii2binary(String JavaDoc str) {
66     if(str == null) return null;
67     String JavaDoc val = str.substring(2);
68     
69     int size = val.length();
70     byte []buf = new byte[size/2];
71     byte []p = val.getBytes();
72     
73     for(int i = 0; i < (int) (size / 2); i++)
74     {
75         int j = i * 2;
76         byte v = 0;
77         if (p[j] >= '0' && p[j] <= '9') {
78         v = (byte) ((p[j] - '0') << 4);
79         }
80         else if (p[j] >= 'a' && p[j] <= 'f') {
81         v = (byte) ((p[j] - 'a' + 10) << 4);
82         }
83         else if (p[j] >= 'A' && p[j] <= 'F') {
84         v = (byte) ((p[j] - 'A' + 10) << 4);
85         }
86         else
87         throw new Error JavaDoc("BAD format :" + str);
88         
89         if (p[j+1] >= '0' && p[j+1] <= '9') {
90         //System.out.println("ascii : " + p[j+1]);
91 v += (p[j+1] - '0');
92         //System.out.println("binary : " + v);
93 }
94         else if (p[j+1] >= 'a' && p[j+1] <= 'f') {
95         //System.out.println("ascii : " + p[j+1]);
96 v += (p[j+1] - 'a' + 10);
97         //System.out.println("binary : " + v+1);
98 }
99         else if (p[j+1] >= 'A' && p[j+1] <= 'F') {
100         //System.out.println("ascii : " + p[j+1]);
101 v += (p[j+1] - 'A' + 10);
102         //System.out.println("binary : " + v);
103 }
104         else
105         throw new Error JavaDoc("BAD format :" + str);
106         
107         buf[i] = (byte) v;
108     }
109     return buf;
110     }
111 }
112
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