http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
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package org.bouncycastle.asn1.cms;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;


Parser of RFC 3274 CompressedData object. 


CompressedData ::= SEQUENCE {
    version CMSVersion,
    compressionAlgorithm CompressionAlgorithmIdentifier,
    encapContentInfo EncapsulatedContentInfo
}



/**
 * Parser of <a href="http://tools.ietf.org/html/rfc3274">RFC 3274</a> {@link CompressedData} object.
 * <p>
 * <pre>
 * CompressedData ::= SEQUENCE {
 *     version CMSVersion,
 *     compressionAlgorithm CompressionAlgorithmIdentifier,
 *     encapContentInfo EncapsulatedContentInfo
 * }
 * </pre>
 */
public class CompressedDataParser
{
    private ASN1Integer _version;
    private AlgorithmIdentifier _compressionAlgorithm;
    private ContentInfoParser _encapContentInfo;

    public CompressedDataParser(
        ASN1SequenceParser seq)
        throws IOException
    {
        this._version = (ASN1Integer)seq.readObject();
        this._compressionAlgorithm = AlgorithmIdentifier.getInstance(seq.readObject().toASN1Primitive());
        this._encapContentInfo = new ContentInfoParser((ASN1SequenceParser)seq.readObject());
    }

    public ASN1Integer getVersion()
    {
        return _version;
    }

    public AlgorithmIdentifier getCompressionAlgorithmIdentifier()
    {
        return _compressionAlgorithm;
    }

    public ContentInfoParser getEncapContentInfo()
    {
        return _encapContentInfo;
    }
}