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// --- BEGIN COPYRIGHT BLOCK ---
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
// (C) 2007 Red Hat, Inc.
// All rights reserved.
// --- END COPYRIGHT BLOCK ---
package netscape.security.x509;
import java.io.*;
import netscape.security.util.*;
/**
* Represent the GeneralSubtree ASN.1 object, whose syntax is:
* <pre>
* GeneralSubtree ::= SEQUENCE {
* base GeneralName,
* minimum [0] BaseDistance DEFAULT 0,
* maximum [1] BaseDistance OPTIONAL
* }
* BaseDistance ::= INTEGER (0..MAX)
* </pre>
* @version 1.5
* @author Amit Kapoor
* @author Hemma Prafullchandra
*/
public class GeneralSubtree {
private static final byte TAG_MIN = 0;
private static final byte TAG_MAX = 1;
private static final int MIN_DEFAULT = 0;
private GeneralName name;
private int minimum = MIN_DEFAULT;
private int maximum = -1;
private PrettyPrintFormat pp = new PrettyPrintFormat(":");
/**
* The default constructor for the class.
*
* @param name the GeneralName
* @param min the minimum BaseDistance
* @param max the maximum BaseDistance
*/
public GeneralSubtree(GeneralName name, int min, int max) {
this.name = name;
this.minimum = min;
this.maximum = max;
}
/**
* Create the object from its DER encoded form.
*
* @param val the DER encoded from of the same.
*/
public GeneralSubtree(DerValue val) throws IOException {
if (val.tag != DerValue.tag_Sequence) {
throw new IOException("Invalid encoding for GeneralSubtree.");
}
name = new GeneralName(val.data.getDerValue());
// NB. this is always encoded with the IMPLICIT tag
// The checks only make sense if we assume implicit tagging,
// with explicit tagging the form is always constructed.
while (val.data.available() != 0) {
DerValue opt = val.data.getDerValue();
if (opt.isContextSpecific(TAG_MIN) && !opt.isConstructed()) {
opt.resetTag(DerValue.tag_Integer);
minimum = (opt.getInteger()).toInt();
} else if (opt.isContextSpecific(TAG_MAX) && !opt.isConstructed()) {
opt.resetTag(DerValue.tag_Integer);
maximum = (opt.getInteger()).toInt();
} else
throw new IOException("Invalid encoding of GeneralSubtree.");
}
}
/**
* Return a printable string of the GeneralSubtree.
*/
public String toString() {
String s = "\n GeneralSubtree: [\n" +
" GeneralName: " + ((name == null) ? "" : name.toString()) +
"\n Minimum: " + minimum;
if (maximum == -1) {
s += "\t Maximum: undefined";
} else
s += "\t Maximum: " + maximum;
s += " ]\n";
return (s);
}
public String toPrint(int indent) {
String s = "\n"+pp.indent(indent) + "GeneralSubtree: [\n" + pp.indent(indent+2) +
"GeneralName: " + ((name == null) ? "" : name.toString()) +
"\n"+pp.indent(indent+2) + "Minimum: " + minimum;
if (maximum == -1) {
s += "\n" + pp.indent(indent+2) + "Maximum: undefined";
} else
s += "\n" + pp.indent(indent+2) + "Maximum: " + maximum;
s += "]\n";
return (s);
}
/**
* Encode the GeneralSubtree.
*
* @param out the DerOutputStream to encode this object to.
*/
public void encode(DerOutputStream out) throws IOException {
DerOutputStream seq = new DerOutputStream();
name.encode(seq);
if (minimum != MIN_DEFAULT)
{
DerOutputStream tmp = new DerOutputStream();
tmp.putInteger(new BigInt(minimum));
seq.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
false, TAG_MIN), tmp);
}
if (maximum != -1) {
DerOutputStream tmp = new DerOutputStream();
tmp.putInteger(new BigInt(maximum));
seq.writeImplicit(DerValue.createTag(DerValue.TAG_CONTEXT,
false, TAG_MAX), tmp);
}
out.write(DerValue.tag_Sequence,seq);
}
public GeneralName getGeneralName() {
return name;
}
public int getMaxValue() {
return maximum;
}
public int getMinValue() {
return minimum;
}
}
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