org.bouncycastle.asn1.cms.CompressedData.java Source code

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Here is the source code for org.bouncycastle.asn1.cms.CompressedData.java

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package org.bouncycastle.asn1.cms;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/** 
 * <a href="http://tools.ietf.org/html/rfc3274">RFC 3274</a>: CMS Compressed Data.
 * 
 * <pre>
 * CompressedData ::= SEQUENCE {
 *     version CMSVersion,
 *     compressionAlgorithm CompressionAlgorithmIdentifier,
 *     encapContentInfo EncapsulatedContentInfo
 * }
 * </pre>
 */
public class CompressedData extends ASN1Object {
    private ASN1Integer version;
    private AlgorithmIdentifier compressionAlgorithm;
    private ContentInfo encapContentInfo;

    public CompressedData(AlgorithmIdentifier compressionAlgorithm, ContentInfo encapContentInfo) {
        this.version = new ASN1Integer(0);
        this.compressionAlgorithm = compressionAlgorithm;
        this.encapContentInfo = encapContentInfo;
    }

    private CompressedData(ASN1Sequence seq) {
        this.version = (ASN1Integer) seq.getObjectAt(0);
        this.compressionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
        this.encapContentInfo = ContentInfo.getInstance(seq.getObjectAt(2));
    }

    /**
     * Return a CompressedData object from a tagged object.
     *
     * @param ato the tagged object holding the object we want.
     * @param isExplicit true if the object is meant to be explicitly
     *              tagged false otherwise.
     * @exception IllegalArgumentException if the object held by the
     *          tagged object cannot be converted.
     */
    public static CompressedData getInstance(ASN1TaggedObject ato, boolean isExplicit) {
        return getInstance(ASN1Sequence.getInstance(ato, isExplicit));
    }

    /**
     * Return a CompressedData object from the given object.
     * <p>
     * Accepted inputs:
     * <ul>
     * <li> null &rarr; null
     * <li> {@link CompressedData} object
     * <li> {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with CompressedData structure inside
     * </ul>
     *
     * @param obj the object we want converted.
     * @exception IllegalArgumentException if the object cannot be converted.
     */
    public static CompressedData getInstance(Object obj) {
        if (obj instanceof CompressedData) {
            return (CompressedData) obj;
        }

        if (obj != null) {
            return new CompressedData(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public ASN1Integer getVersion() {
        return version;
    }

    public AlgorithmIdentifier getCompressionAlgorithmIdentifier() {
        return compressionAlgorithm;
    }

    public ContentInfo getEncapContentInfo() {
        return encapContentInfo;
    }

    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(version);
        v.add(compressionAlgorithm);
        v.add(encapContentInfo);

        return new BERSequence(v);
    }
}