org.bouncycastle.asn1.BERTaggedObject.java Source code

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Here is the source code for org.bouncycastle.asn1.BERTaggedObject.java

Source

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() {
        return explicit || obj.toASN1Primitive().isConstructed();
    }

    int encodedLength() throws IOException {
        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;
        }
    }

    void encode(ASN1OutputStream out, boolean withTag) throws IOException {
        out.writeTag(withTag, BERTags.CONSTRUCTED | BERTags.TAGGED, tagNo);
        out.write(0x80);

        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 ASN1Exception("not implemented: " + obj.getClass().getName());
            }

            out.writeElements(e);
        } else {
            out.writePrimitive(obj.toASN1Primitive(), true);
        }

        out.write(0x00);
        out.write(0x00);

        //        ASN1Primitive primitive = obj.toASN1Primitive();
        //
        //        int flags = BERTags.TAGGED;
        //        if (explicit || primitive.isConstructed())
        //        {
        //            flags |= BERTags.CONSTRUCTED;
        //        }
        //
        //        out.writeTag(withTag, flags, tagNo);
        //
        //        if (explicit)
        //        {
        //            out.write(0x80);
        //            out.writePrimitive(obj.toASN1Primitive(), true);
        //            out.write(0x00);
        //            out.write(0x00);
        //        }
        //        else
        //        {
        //            out.writePrimitive(obj.toASN1Primitive(), false);
        //        }
    }
}