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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* accompanied this code).
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package javax.smartcardio;
import java.util.*;
A Smart Card's answer-to-reset bytes. A Card's ATR object can be obtained by calling Card.getATR. This class does not attempt to verify that the ATR encodes a semantically valid structure. Instances of this class are immutable. Where data is passed in or out
via byte arrays, defensive cloning is performed.
Author: Andreas Sterbenz, JSR 268 Expert Group See Also: Since: 1.6
/**
* A Smart Card's answer-to-reset bytes. A Card's ATR object can be obtained
* by calling {@linkplain Card#getATR}.
* This class does not attempt to verify that the ATR encodes a semantically
* valid structure.
*
* <p>Instances of this class are immutable. Where data is passed in or out
* via byte arrays, defensive cloning is performed.
*
* @see Card#getATR
*
* @since 1.6
* @author Andreas Sterbenz
* @author JSR 268 Expert Group
*/
public final class ATR implements java.io.Serializable {
private static final long serialVersionUID = 6695383790847736493L;
private byte[] atr;
private transient int startHistorical, nHistorical;
Constructs an ATR from a byte array.
Params: - atr – the byte array containing the answer-to-reset bytes
Throws: - NullPointerException – if
atr is null
/**
* Constructs an ATR from a byte array.
*
* @param atr the byte array containing the answer-to-reset bytes
* @throws NullPointerException if <code>atr</code> is null
*/
public ATR(byte[] atr) {
this.atr = atr.clone();
parse();
}
private void parse() {
if (atr.length < 2) {
return;
}
if ((atr[0] != 0x3b) && (atr[0] != 0x3f)) {
return;
}
int t0 = (atr[1] & 0xf0) >> 4;
int n = atr[1] & 0xf;
int i = 2;
while ((t0 != 0) && (i < atr.length)) {
if ((t0 & 1) != 0) {
i++;
}
if ((t0 & 2) != 0) {
i++;
}
if ((t0 & 4) != 0) {
i++;
}
if ((t0 & 8) != 0) {
if (i >= atr.length) {
return;
}
t0 = (atr[i++] & 0xf0) >> 4;
} else {
t0 = 0;
}
}
int k = i + n;
if ((k == atr.length) || (k == atr.length - 1)) {
startHistorical = i;
nHistorical = n;
}
}
Returns a copy of the bytes in this ATR.
Returns: a copy of the bytes in this ATR.
/**
* Returns a copy of the bytes in this ATR.
*
* @return a copy of the bytes in this ATR.
*/
public byte[] getBytes() {
return atr.clone();
}
Returns a copy of the historical bytes in this ATR.
If this ATR does not contain historical bytes, an array of length
zero is returned.
Returns: a copy of the historical bytes in this ATR.
/**
* Returns a copy of the historical bytes in this ATR.
* If this ATR does not contain historical bytes, an array of length
* zero is returned.
*
* @return a copy of the historical bytes in this ATR.
*/
public byte[] getHistoricalBytes() {
byte[] b = new byte[nHistorical];
System.arraycopy(atr, startHistorical, b, 0, nHistorical);
return b;
}
Returns a string representation of this ATR.
Returns: a String representation of this ATR.
/**
* Returns a string representation of this ATR.
*
* @return a String representation of this ATR.
*/
public String toString() {
return "ATR: " + atr.length + " bytes";
}
Compares the specified object with this ATR for equality.
Returns true if the given object is also an ATR and its bytes are
identical to the bytes in this ATR.
Params: - obj – the object to be compared for equality with this ATR
Returns: true if the specified object is equal to this ATR
/**
* Compares the specified object with this ATR for equality.
* Returns true if the given object is also an ATR and its bytes are
* identical to the bytes in this ATR.
*
* @param obj the object to be compared for equality with this ATR
* @return true if the specified object is equal to this ATR
*/
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof ATR == false) {
return false;
}
ATR other = (ATR)obj;
return Arrays.equals(this.atr, other.atr);
}
Returns the hash code value for this ATR.
Returns: the hash code value for this ATR.
/**
* Returns the hash code value for this ATR.
*
* @return the hash code value for this ATR.
*/
public int hashCode() {
return Arrays.hashCode(atr);
}
private void readObject(java.io.ObjectInputStream in)
throws java.io.IOException, ClassNotFoundException {
atr = (byte[])in.readUnshared();
parse();
}
}