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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
* <pre>
* CMSCompressedData cd = new CMSCompressedData(inputStream);
*
* process(cd.getContent(new ZlibExpanderProvider()));
* </pre>
*/
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();
}
}
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