/*
* Copyright (c) 2001, 2006, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package com.sun.jmx.snmp.internal;
import com.sun.jmx.snmp.SnmpDefinitions;
/**
* Utility class used to deal with various data representations.
* <p><b>This API is a Sun Microsystems internal API and is subject
* to change without notice.</b></p>
* @since 1.5
*/
public class SnmpTools implements SnmpDefinitions {
/**
* Translates a binary representation in an ASCII one. The returned string is an hexadecimal string starting with 0x.
* @param data Binary to translate.
* @return Translated binary.
*/
static public String binary2ascii(byte[] data, int length)
{
if(data == null) return null;
final int size = (length * 2) + 2;
byte[] asciiData = new byte[size];
asciiData[0] = (byte) '0';
asciiData[1] = (byte) 'x';
for (int i=0; i < length; i++) {
int j = i*2;
int v = (data[i] & 0xf0);
v = v >> 4;
if (v < 10)
asciiData[j+2] = (byte) ('0' + v);
else
asciiData[j+2] = (byte) ('A' + (v - 10));
v = ((data[i] & 0xf));
if (v < 10)
asciiData[j+1+2] = (byte) ('0' + v);
else
asciiData[j+1+2] = (byte) ('A' + (v - 10));
}
return new String(asciiData);
}
/**
* Translates a binary representation in an ASCII one. The returned string is an hexadecimal string starting with 0x.
* @param data Binary to translate.
* @return Translated binary.
*/
static public String binary2ascii(byte[] data)
{
return binary2ascii(data, data.length);
}
/**
* Translates a stringified representation in a binary one. The passed string is an hexadecimal one starting with 0x.
* @param str String to translate.
* @return Translated string.
*/
static public byte[] ascii2binary(String str) {
if(str == null) return null;
String val = str.substring(2);
int size = val.length();
byte []buf = new byte[size/2];
byte []p = val.getBytes();
for(int i = 0; i < (size / 2); i++)
{
int j = i * 2;
byte v = 0;
if (p[j] >= '0' && p[j] <= '9') {
v = (byte) ((p[j] - '0') << 4);
}
else if (p[j] >= 'a' && p[j] <= 'f') {
v = (byte) ((p[j] - 'a' + 10) << 4);
}
else if (p[j] >= 'A' && p[j] <= 'F') {
v = (byte) ((p[j] - 'A' + 10) << 4);
}
else
throw new Error("BAD format :" + str);
if (p[j+1] >= '0' && p[j+1] <= '9') {
//System.out.println("ascii : " + p[j+1]);
v += (p[j+1] - '0');
//System.out.println("binary : " + v);
}
else if (p[j+1] >= 'a' && p[j+1] <= 'f') {
//System.out.println("ascii : " + p[j+1]);
v += (p[j+1] - 'a' + 10);
//System.out.println("binary : " + v+1);
}
else if (p[j+1] >= 'A' && p[j+1] <= 'F') {
//System.out.println("ascii : " + p[j+1]);
v += (p[j+1] - 'A' + 10);
//System.out.println("binary : " + v);
}
else
throw new Error("BAD format :" + str);
buf[i] = v;
}
return buf;
}
}