package org.bouncycastle.cms;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.InflaterInputStream;
import org.bouncycastle.asn1.cms.CompressedDataParser;
import org.bouncycastle.asn1.cms.ContentInfoParser;
import org.bouncycastle.asn1.ASN1OctetStringParser;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.DERTags;
/**
* Class for reading a CMS Compressed Data stream.
* <pre>
* CMSCompressedDataParser cp = new CMSCompressedDataParser(inputStream);
*
* process(cp.getContent().getContentStream());
* </pre>
* Note: this class does not introduce buffering - if you are processing large files you should create
* the parser with:
* <pre>
* CMSCompressedDataParser ep = new CMSCompressedDataParser(new BufferedInputStream(inputStream, bufSize));
* </pre>
* where bufSize is a suitably large buffer size.
*/
public class CMSCompressedDataParser
extends CMSContentInfoParser
{
public CMSCompressedDataParser(
byte[] compressedData)
throws CMSException
{
this(new ByteArrayInputStream(compressedData));
}
public CMSCompressedDataParser(
InputStream compressedData)
throws CMSException
{
super(compressedData);
}
public CMSTypedStream getContent()
throws CMSException
{
try
{
CompressedDataParser comData = new CompressedDataParser((ASN1SequenceParser)_contentInfo.getContent(DERTags.SEQUENCE));
ContentInfoParser content = comData.getEncapContentInfo();
ASN1OctetStringParser bytes = (ASN1OctetStringParser)content.getContent(DERTags.OCTET_STRING);
return new CMSTypedStream(content.getContentType().toString(), new InflaterInputStream(bytes.getOctetStream()));
}
catch (IOException e)
{
throw new CMSException("IOException reading compressed content.", e);
}
}
}