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package org.bouncycastle.asn1;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Enumeration;
/**
* A DER encoded set object
*/
public class DERSet
extends ASN1Set
{
/**
* create an empty set
*/
public DERSet()
{
}
/**
* @param obj - a single object that makes up the set.
*/
public DERSet(
DEREncodable obj)
{
this.addObject(obj);
}
/**
* @param v - a vector of objects making up the set.
*/
public DERSet(
DEREncodableVector v)
{
this(v, true);
}
/**
* create a set from an array of objects.
*/
public DERSet(
ASN1Encodable[] a)
{
for (int i = 0; i != a.length; i++)
{
this.addObject(a[i]);
}
this.sort();
}
/**
* @param v - a vector of objects making up the set.
*/
DERSet(
DEREncodableVector v,
boolean needsSorting)
{
for (int i = 0; i != v.size(); i++)
{
this.addObject(v.get(i));
}
if (needsSorting)
{
this.sort();
}
}
/*
* A note on the implementation:
* <p>
* As DER requires the constructed, definite-length model to
* be used for structured types, this varies slightly from the
* ASN.1 descriptions given. Rather than just outputing SET,
* we also have to specify CONSTRUCTED, and the objects length.
*/
void encode(
DEROutputStream out)
throws IOException
{
// TODO Intermediate buffer could be avoided if we could calculate expected length
ByteArrayOutputStream bOut = new ByteArrayOutputStream();
DEROutputStream dOut = new DEROutputStream(bOut);
Enumeration e = this.getObjects();
while (e.hasMoreElements())
{
Object obj = e.nextElement();
dOut.writeObject(obj);
}
dOut.close();
byte[] bytes = bOut.toByteArray();
out.writeEncoded(SET | CONSTRUCTED, bytes);
}
}
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