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using System;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Cms
{
/**
* RFC 3274 - CMS Compressed Data.
* <pre>
* CompressedData ::= Sequence {
* version CMSVersion,
* compressionAlgorithm CompressionAlgorithmIdentifier,
* encapContentInfo EncapsulatedContentInfo
* }
* </pre>
*/
public class CompressedData
: Asn1Encodable
{
private DerInteger version;
private AlgorithmIdentifier compressionAlgorithm;
private ContentInfo encapContentInfo;
public CompressedData(
AlgorithmIdentifier compressionAlgorithm,
ContentInfo encapContentInfo)
{
this.version = new DerInteger(0);
this.compressionAlgorithm = compressionAlgorithm;
this.encapContentInfo = encapContentInfo;
}
public CompressedData(
Asn1Sequence seq)
{
this.version = (DerInteger) seq[0];
this.compressionAlgorithm = AlgorithmIdentifier.GetInstance(seq[1]);
this.encapContentInfo = ContentInfo.GetInstance(seq[2]);
}
/**
* return a CompressedData object from a tagged object.
*
* @param ato the tagged object holding the object we want.
* @param explicitly true if the object is meant to be explicitly
* tagged false otherwise.
* @exception ArgumentException if the object held by the
* tagged object cannot be converted.
*/
public static CompressedData GetInstance(
Asn1TaggedObject ato,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(ato, explicitly));
}
/**
* return a CompressedData object from the given object.
*
* @param _obj the object we want converted.
* @exception ArgumentException if the object cannot be converted.
*/
public static CompressedData GetInstance(
object obj)
{
if (obj == null || obj is CompressedData)
return (CompressedData)obj;
if (obj is Asn1Sequence)
return new CompressedData((Asn1Sequence) obj);
throw new ArgumentException("Invalid CompressedData: " + Platform.GetTypeName(obj));
}
public DerInteger Version
{
get { return version; }
}
public AlgorithmIdentifier CompressionAlgorithmIdentifier
{
get { return compressionAlgorithm; }
}
public ContentInfo EncapContentInfo
{
get { return encapContentInfo; }
}
public override Asn1Object ToAsn1Object()
{
return new BerSequence(version, compressionAlgorithm, encapContentInfo);
}
}
}
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