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/*
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* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.smartcardio;
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import java.util.*;
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/**
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* A Smart Card's answer-to-reset bytes. A Card's ATR object can be obtained
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* by calling {@linkplain Card#getATR}.
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* This class does not attempt to verify that the ATR encodes a semantically
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* valid structure.
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*
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* <p>Instances of this class are immutable. Where data is passed in or out
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* via byte arrays, defensive cloning is performed.
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*
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* @see Card#getATR
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*
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* @since 1.6
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* @author Andreas Sterbenz
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* @author JSR 268 Expert Group
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*/
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public final class ATR implements java.io.Serializable {
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private static final long serialVersionUID = 6695383790847736493L;
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private byte[] atr;
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private transient int startHistorical, nHistorical;
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/**
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* Constructs an ATR from a byte array.
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*
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* @param atr the byte array containing the answer-to-reset bytes
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* @throws NullPointerException if <code>atr</code> is null
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*/
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public ATR(byte[] atr) {
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this.atr = atr.clone();
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parse();
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}
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private void parse() {
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if (atr.length < 2) {
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return;
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}
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if ((atr[0] != 0x3b) && (atr[0] != 0x3f)) {
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return;
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}
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int t0 = (atr[1] & 0xf0) >> 4;
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int n = atr[1] & 0xf;
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int i = 2;
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while ((t0 != 0) && (i < atr.length)) {
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if ((t0 & 1) != 0) {
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i++;
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}
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if ((t0 & 2) != 0) {
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i++;
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}
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if ((t0 & 4) != 0) {
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i++;
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}
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if ((t0 & 8) != 0) {
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if (i >= atr.length) {
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return;
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}
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t0 = (atr[i++] & 0xf0) >> 4;
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} else {
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t0 = 0;
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}
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}
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int k = i + n;
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if ((k == atr.length) || (k == atr.length - 1)) {
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startHistorical = i;
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nHistorical = n;
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}
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}
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/**
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* Returns a copy of the bytes in this ATR.
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*
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* @return a copy of the bytes in this ATR.
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*/
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public byte[] getBytes() {
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return atr.clone();
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}
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/**
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* Returns a copy of the historical bytes in this ATR.
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* If this ATR does not contain historical bytes, an array of length
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* zero is returned.
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*
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* @return a copy of the historical bytes in this ATR.
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*/
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public byte[] getHistoricalBytes() {
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byte[] b = new byte[nHistorical];
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System.arraycopy(atr, startHistorical, b, 0, nHistorical);
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return b;
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}
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/**
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* Returns a string representation of this ATR.
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*
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* @return a String representation of this ATR.
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*/
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public String toString() {
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return "ATR: " + atr.length + " bytes";
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}
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/**
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* Compares the specified object with this ATR for equality.
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* Returns true if the given object is also an ATR and its bytes are
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* identical to the bytes in this ATR.
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*
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* @param obj the object to be compared for equality with this ATR
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* @return true if the specified object is equal to this ATR
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*/
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (obj instanceof ATR == false) {
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return false;
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}
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ATR other = (ATR)obj;
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return Arrays.equals(this.atr, other.atr);
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}
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/**
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* Returns the hash code value for this ATR.
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*
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* @return the hash code value for this ATR.
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*/
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public int hashCode() {
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return Arrays.hashCode(atr);
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}
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private void readObject(java.io.ObjectInputStream in)
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throws java.io.IOException, ClassNotFoundException {
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atr = (byte[])in.readUnshared();
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parse();
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}
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}
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