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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.4. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.cms;

import java.io.IOException;
import java.io.InputStream;
import java.util.zip.InflaterInputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.cms.CompressedData;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.operator.InputExpander;
import org.bouncycastle.operator.InputExpanderProvider;

/**
 * containing class for an CMS Compressed Data object
 *  *     CMSCompressedData cd = new CMSCompressedData(inputStream);
 *
 *     process(cd.getContent(new ZlibExpanderProvider()));
 * 
 */
public class CMSCompressedData
{
    ContentInfo                 contentInfo;
    CompressedData              comData;

    public CMSCompressedData(
        byte[]    compressedData) 
        throws CMSException
    {
        this(CMSUtils.readContentInfo(compressedData));
    }

    public CMSCompressedData(
        InputStream    compressedData) 
        throws CMSException
    {
        this(CMSUtils.readContentInfo(compressedData));
    }

    public CMSCompressedData(
        ContentInfo contentInfo)
        throws CMSException
    {
        this.contentInfo = contentInfo;

        try
        {
            this.comData = CompressedData.getInstance(contentInfo.getContent());
        }
        catch (ClassCastException e)
        {
            throw new CMSException("Malformed content.", e);
        }
        catch (IllegalArgumentException e)
        {
            throw new CMSException("Malformed content.", e);
        }
    }

    /**
     * Return the uncompressed content.
     *
     * @return the uncompressed content
     * @throws CMSException if there is an exception uncompressing the data.
     * @deprecated use getContent(InputExpanderProvider)
     */
    public byte[] getContent()
        throws CMSException
    {
        ContentInfo     content = comData.getEncapContentInfo();

        ASN1OctetString bytes = (ASN1OctetString)content.getContent();

        InflaterInputStream     zIn = new InflaterInputStream(bytes.getOctetStream());

        try
        {
            return CMSUtils.streamToByteArray(zIn);
        }
        catch (IOException e)
        {
            throw new CMSException("exception reading compressed stream.", e);
        }
    }

    /**
     * Return the uncompressed content, throwing an exception if the data size
     * is greater than the passed in limit. If the content is exceeded getCause()
     * on the CMSException will contain a StreamOverflowException
     *
     * @param limit maximum number of bytes to read
     * @return the content read
     * @throws CMSException if there is an exception uncompressing the data.
     * @deprecated use getContent(InputExpanderProvider)
     */
    public byte[] getContent(int limit)
        throws CMSException
    {
        ContentInfo     content = comData.getEncapContentInfo();

        ASN1OctetString bytes = (ASN1OctetString)content.getContent();

        InflaterInputStream     zIn = new InflaterInputStream(bytes.getOctetStream());

        try
        {
            return CMSUtils.streamToByteArray(zIn, limit);
        }
        catch (IOException e)
        {
            throw new CMSException("exception reading compressed stream.", e);
        }
    }

    public ASN1ObjectIdentifier getContentType()
    {
        return contentInfo.getContentType();
    }

    /**
     * Return the uncompressed content.
     *
     * @param expanderProvider a provider of expander algorithm implementations.
     * @return the uncompressed content
     * @throws CMSException if there is an exception un-compressing the data.
     */
    public byte[] getContent(InputExpanderProvider expanderProvider)
        throws CMSException
    {
        ContentInfo     content = comData.getEncapContentInfo();

        ASN1OctetString bytes = (ASN1OctetString)content.getContent();
        InputExpander   expander = expanderProvider.get(comData.getCompressionAlgorithmIdentifier());
        InputStream     zIn = expander.getInputStream(bytes.getOctetStream());

        try
        {
            return CMSUtils.streamToByteArray(zIn);
        }
        catch (IOException e)
        {
            throw new CMSException("exception reading compressed stream.", e);
        }
    }

    /**
     * return the ContentInfo 
     * @deprecated use toASN1Structure()
     */
    public ContentInfo getContentInfo()
    {
        return contentInfo;
    }

    /**
     * return the ContentInfo
     */
    public ContentInfo toASN1Structure()
    {
        return contentInfo;
    }
    
    /**
     * return the ASN.1 encoded representation of this object.
     */
    public byte[] getEncoded()
        throws IOException
    {
        return contentInfo.getEncoded();
    }
}