66 lines
1.7 KiB
Java
66 lines
1.7 KiB
Java
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// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
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package org.xbill.DNS2.clients;
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/**
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* A routine to produce a nice looking hex dump
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*
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* @author Brian Wellington
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*/
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public
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class hexdump {
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private static final char[] hex = "0123456789ABCDEF".toCharArray();
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public static
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String dump(String s, byte[] b) {
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return dump(s, b, 0, b.length);
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}
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/**
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* Dumps a byte array into hex format.
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*
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* @param description If not null, a description of the data.
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* @param b The data to be printed.
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* @param offset The start of the data in the array.
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* @param length The length of the data in the array.
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*/
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public static
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String dump(String description, byte[] b, int offset, int length) {
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StringBuilder sb = new StringBuilder();
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sb.append(length)
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.append("b");
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if (description != null) {
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sb.append(" (")
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.append(description)
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.append(")");
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}
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sb.append(':');
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int prefixlen = sb.toString()
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.length();
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prefixlen = (prefixlen + 8) & ~7;
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sb.append('\t');
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int perline = (80 - prefixlen) / 3;
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for (int i = 0; i < length; i++) {
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if (i != 0 && i % perline == 0) {
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sb.append('\n');
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for (int j = 0; j < prefixlen / 8; j++) {
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sb.append('\t');
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}
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}
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int value = (int) (b[i + offset]) & 0xFF;
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sb.append(hex[(value >> 4)]);
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sb.append(hex[(value & 0xF)]);
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sb.append(' ');
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}
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sb.append('\n');
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return sb.toString();
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}
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}
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