| // 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); |
| } |
| |
| } |