56 lines
1.7 KiB
Java
56 lines
1.7 KiB
Java
// Copyright (C) 2001-2003, 2022 VeriSign, Inc.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.verisignlabs.dnssec.security;
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import java.util.Comparator;
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import java.util.logging.Logger;
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/**
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* This class implements a basic comparator for byte arrays. It is primarily
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* useful for comparing RDATA portions of DNS records in doing DNSSEC canonical
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* ordering.
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*
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* @author David Blacka
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*/
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public class ByteArrayComparator implements Comparator<byte[]> {
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private int mOffset = 0;
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private boolean mDebug = false;
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private Logger log;
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public ByteArrayComparator() {
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}
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public ByteArrayComparator(int offset, boolean debug) {
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mOffset = offset;
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mDebug = debug;
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}
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public int compare(byte[] b1, byte[] b2) {
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for (int i = mOffset; i < b1.length && i < b2.length; i++) {
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if (b1[i] != b2[i]) {
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if (mDebug) {
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log.info("offset " + i + " differs (this is "
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+ (i - mOffset) + " bytes in from our offset.)");
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}
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return (b1[i] & 0xFF) - (b2[i] & 0xFF);
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}
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}
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return b1.length - b2.length;
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}
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}
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