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// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
package org.xbill.DNS.utils;
/**
* A routine to produce a nice looking hex dump
*
* @author Brian Wellington
*/
public class hexdump {
private static final char [] hex = "0123456789ABCDEF".toCharArray();
/**
* Dumps a byte array into hex format.
* @param description If not null, a description of the data.
* @param b The data to be printed.
* @param offset The start of the data in the array.
* @param length The length of the data in the array.
*/
public static String
dump(String description, byte [] b, int offset, int length) {
StringBuffer sb = new StringBuffer();
sb.append(length + "b");
if (description != null)
sb.append(" (" + description + ")");
sb.append(':');
int prefixlen = sb.toString().length();
prefixlen = (prefixlen + 8) & ~ 7;
sb.append('\t');
int perline = (80 - prefixlen) / 3;
for (int i = 0; i < length; i++) {
if (i != 0 && i % perline == 0) {
sb.append('\n');
for (int j = 0; j < prefixlen / 8 ; j++)
sb.append('\t');
}
int value = (int)(b[i + offset]) & 0xFF;
sb.append(hex[(value >> 4)]);
sb.append(hex[(value & 0xF)]);
sb.append(' ');
}
sb.append('\n');
return sb.toString();
}
public static String
dump(String s, byte [] b) {
return dump(s, b, 0, b.length);
}
}
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