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org.bouncycastle.cms.CMSCompressedDataParser Maven / Gradle / Ivy

package org.bouncycastle.cms;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.asn1.ASN1OctetStringParser;
import org.bouncycastle.asn1.ASN1SequenceParser;
import org.bouncycastle.asn1.BERTags;
import org.bouncycastle.asn1.cms.CompressedDataParser;
import org.bouncycastle.asn1.cms.ContentInfoParser;
import org.bouncycastle.operator.InputExpander;
import org.bouncycastle.operator.InputExpanderProvider;

/**
 * Class for reading a CMS Compressed Data stream.
 *  
 *     CMSCompressedDataParser cp = new CMSCompressedDataParser(inputStream);
 *      
 *     process(cp.getContent(new ZlibExpanderProvider()).getContentStream());
 * 
* Note: this class does not introduce buffering - if you are processing large files you should create * the parser with: * * CMSCompressedDataParser ep = new CMSCompressedDataParser(new BufferedInputStream(inputStream, bufSize)); * * 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); } /** * Return a typed stream which will allow the reading of the compressed content in * expanded form. * * @param expanderProvider a provider of expander algorithm implementations. * @return a type stream which will yield the un-compressed content. * @throws CMSException if there is an exception parsing the CompressedData object. */ public CMSTypedStream getContent(InputExpanderProvider expanderProvider) throws CMSException { try { CompressedDataParser comData = new CompressedDataParser((ASN1SequenceParser)_contentInfo.getContent(BERTags.SEQUENCE)); ContentInfoParser content = comData.getEncapContentInfo(); InputExpander expander = expanderProvider.get(comData.getCompressionAlgorithmIdentifier()); ASN1OctetStringParser bytes = (ASN1OctetStringParser)content.getContent(BERTags.OCTET_STRING); return new CMSTypedStream(content.getContentType(), expander.getInputStream(bytes.getOctetStream())); } catch (IOException e) { throw new CMSException("IOException reading compressed content.", e); } } }



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