org.bouncycastle.asn1.cms.CompressedData Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of bcutil-jdk15on Show documentation

The Bouncy Castle Java APIs for ASN.1 extension and utility APIs used to support bcpkix and bctls. This jar contains APIs for JDK 1.5 and up.

There is a newer version: 1.70

Show newest version

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;

/** 
 * RFC 3274: CMS Compressed Data.
 * 
 *  * CompressedData ::= SEQUENCE {
 *     version CMSVersion,
 *     compressionAlgorithm CompressionAlgorithmIdentifier,
 *     encapContentInfo EncapsulatedContentInfo
 * }
 * 
 */
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.
     * 
     * Accepted inputs:
     * 

     *  null → null
     * 
 {@link CompressedData} object
     * 
 {@link org.bouncycastle.asn1.ASN1Sequence#getInstance(java.lang.Object) ASN1Sequence} input formats with CompressedData structure inside
     * 
     *
     * @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);
    }
}