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package org.bouncycastle.asn1;
import java.io.IOException;
import java.util.Enumeration;
/**
* BER TaggedObject - in ASN.1 notation this is any object preceded by
* a [n] where n is some number - these are assumed to follow the construction
* rules (as with sequences).
*/
public class BERTaggedObject
extends ASN1TaggedObject
{
/**
* @param tagNo the tag number for this object.
* @param obj the tagged object.
*/
public BERTaggedObject(
int tagNo,
ASN1Encodable obj)
{
super(true, tagNo, obj);
}
/**
* @param explicit true if an explicitly tagged object.
* @param tagNo the tag number for this object.
* @param obj the tagged object.
*/
public BERTaggedObject(
boolean explicit,
int tagNo,
ASN1Encodable obj)
{
super(explicit, tagNo, obj);
}
/**
* create an implicitly tagged object that contains a zero
* length sequence.
*/
public BERTaggedObject(
int tagNo)
{
super(false, tagNo, new BERSequence());
}
boolean isConstructed()
{
if (!empty)
{
if (explicit)
{
return true;
}
else
{
ASN1Primitive primitive = obj.toASN1Primitive().toDERObject();
return primitive.isConstructed();
}
}
else
{
return true;
}
}
int encodedLength()
throws IOException
{
if (!empty)
{
ASN1Primitive primitive = obj.toASN1Primitive();
int length = primitive.encodedLength();
if (explicit)
{
return StreamUtil.calculateTagLength(tagNo) + StreamUtil.calculateBodyLength(length) + length;
}
else
{
// header length already in calculation
length = length - 1;
return StreamUtil.calculateTagLength(tagNo) + length;
}
}
else
{
return StreamUtil.calculateTagLength(tagNo) + 1;
}
}
void encode(
ASN1OutputStream out)
throws IOException
{
out.writeTag(BERTags.CONSTRUCTED | BERTags.TAGGED, tagNo);
out.write(0x80);
if (!empty)
{
if (!explicit)
{
Enumeration e;
if (obj instanceof ASN1OctetString)
{
if (obj instanceof BEROctetString)
{
e = ((BEROctetString)obj).getObjects();
}
else
{
ASN1OctetString octs = (ASN1OctetString)obj;
BEROctetString berO = new BEROctetString(octs.getOctets());
e = berO.getObjects();
}
}
else if (obj instanceof ASN1Sequence)
{
e = ((ASN1Sequence)obj).getObjects();
}
else if (obj instanceof ASN1Set)
{
e = ((ASN1Set)obj).getObjects();
}
else
{
throw new RuntimeException("not implemented: " + obj.getClass().getName());
}
while (e.hasMoreElements())
{
out.writeObject((ASN1Encodable)e.nextElement());
}
}
else
{
out.writeObject(obj);
}
}
out.write(0x00);
out.write(0x00);
}
}
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