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package org.bouncycastle.asn1;
import java.io.IOException;
/**
* DER 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 DERTaggedObject
extends ASN1TaggedObject
{
private static final byte[] ZERO_BYTES = new byte[0];
/**
* @param explicit true if an explicitly tagged object.
* @param tagNo the tag number for this object.
* @param obj the tagged object.
*/
public DERTaggedObject(
boolean explicit,
int tagNo,
ASN1Encodable obj)
{
super(explicit, tagNo, obj);
}
public DERTaggedObject(int tagNo, ASN1Encodable encodable)
{
super(true, tagNo, encodable);
}
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().toDERObject();
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
{
if (!empty)
{
ASN1Primitive primitive = obj.toASN1Primitive().toDERObject();
if (explicit)
{
out.writeTag(BERTags.CONSTRUCTED | BERTags.TAGGED, tagNo);
out.writeLength(primitive.encodedLength());
out.writeObject(primitive);
}
else
{
//
// need to mark constructed types...
//
int flags;
if (primitive.isConstructed())
{
flags = BERTags.CONSTRUCTED | BERTags.TAGGED;
}
else
{
flags = BERTags.TAGGED;
}
out.writeTag(flags, tagNo);
out.writeImplicitObject(primitive);
}
}
else
{
out.writeEncoded(BERTags.CONSTRUCTED | BERTags.TAGGED, tagNo, ZERO_BYTES);
}
}
}
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