| 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); |
| } |
| } |
| } |