| 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 tagNo the tag number for this object. |
| * @param obj the tagged object. |
| */ |
| public DERTaggedObject( |
| int tagNo, |
| DEREncodable obj) |
| { |
| super(tagNo, obj); |
| } |
| |
| /** |
| * @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, |
| DEREncodable obj) |
| { |
| super(explicit, tagNo, obj); |
| } |
| |
| /** |
| * create an implicitly tagged object that contains a zero |
| * length sequence. |
| */ |
| public DERTaggedObject( |
| int tagNo) |
| { |
| super(false, tagNo, new DERSequence()); |
| } |
| |
| void encode( |
| DEROutputStream out) |
| throws IOException |
| { |
| if (!empty) |
| { |
| byte[] bytes = obj.getDERObject().getEncoded(DER); |
| |
| if (explicit) |
| { |
| out.writeEncoded(CONSTRUCTED | TAGGED, tagNo, bytes); |
| } |
| else |
| { |
| // |
| // need to mark constructed types... |
| // |
| int flags; |
| if ((bytes[0] & CONSTRUCTED) != 0) |
| { |
| flags = CONSTRUCTED | TAGGED; |
| } |
| else |
| { |
| flags = TAGGED; |
| } |
| |
| out.writeTag(flags, tagNo); |
| out.write(bytes, 1, bytes.length - 1); |
| } |
| } |
| else |
| { |
| out.writeEncoded(CONSTRUCTED | TAGGED, tagNo, ZERO_BYTES); |
| } |
| } |
| } |