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using System;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Cms;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Zlib;
namespace Org.BouncyCastle.Cms
{
/**
* containing class for an CMS Compressed Data object
*/
public class CmsCompressedData
{
internal ContentInfo contentInfo;
public CmsCompressedData(
byte[] compressedData)
: this(CmsUtilities.ReadContentInfo(compressedData))
{
}
public CmsCompressedData(
Stream compressedDataStream)
: this(CmsUtilities.ReadContentInfo(compressedDataStream))
{
}
public CmsCompressedData(
ContentInfo contentInfo)
{
this.contentInfo = contentInfo;
}
/**
* Return the uncompressed content.
*
* @return the uncompressed content
* @throws CmsException if there is an exception uncompressing the data.
*/
public byte[] GetContent()
{
CompressedData comData = CompressedData.GetInstance(contentInfo.Content);
ContentInfo content = comData.EncapContentInfo;
Asn1OctetString bytes = (Asn1OctetString) content.Content;
ZInputStream zIn = new ZInputStream(bytes.GetOctetStream());
try
{
return CmsUtilities.StreamToByteArray(zIn);
}
catch (IOException e)
{
throw new CmsException("exception reading compressed stream.", e);
}
finally
{
Platform.Dispose(zIn);
}
}
/**
* 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.
*/
public byte[] GetContent(int limit)
{
CompressedData comData = CompressedData.GetInstance(contentInfo.Content);
ContentInfo content = comData.EncapContentInfo;
Asn1OctetString bytes = (Asn1OctetString)content.Content;
ZInputStream zIn = new ZInputStream(new MemoryStream(bytes.GetOctets(), false));
try
{
return CmsUtilities.StreamToByteArray(zIn, limit);
}
catch (IOException e)
{
throw new CmsException("exception reading compressed stream.", e);
}
}
/**
* return the ContentInfo
*/
public ContentInfo ContentInfo
{
get { return contentInfo; }
}
/**
* return the ASN.1 encoded representation of this object.
*/
public byte[] GetEncoded()
{
return contentInfo.GetEncoded();
}
}
}
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