package org.bouncycastle.asn1.cms;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.BERSequence;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
/**
* RFC 3274 - CMS Compressed Data.
* <pre>
* CompressedData ::= SEQUENCE {
* version CMSVersion,
* compressionAlgorithm CompressionAlgorithmIdentifier,
* encapContentInfo EncapsulatedContentInfo
* }
* </pre>
*/
public class CompressedData
extends ASN1Object
{
private ASN1Integer version;
private AlgorithmIdentifier compressionAlgorithm;
private ContentInfo encapContentInfo;
public CompressedData(
AlgorithmIdentifier compressionAlgorithm,
ContentInfo encapContentInfo)
{
this.version = new ASN1Integer(0);
this.compressionAlgorithm = compressionAlgorithm;
this.encapContentInfo = encapContentInfo;
}
private CompressedData(
ASN1Sequence seq)
{
this.version = (ASN1Integer)seq.getObjectAt(0);
this.compressionAlgorithm = AlgorithmIdentifier.getInstance(seq.getObjectAt(1));
this.encapContentInfo = ContentInfo.getInstance(seq.getObjectAt(2));
}
/**
* return a CompressedData object from a tagged object.
*
* @param _ato the tagged object holding the object we want.
* @param _explicit true if the object is meant to be explicitly
* tagged false otherwise.
* @exception IllegalArgumentException if the object held by the
* tagged object cannot be converted.
*/
public static CompressedData getInstance(
ASN1TaggedObject _ato,
boolean _explicit)
{
return getInstance(ASN1Sequence.getInstance(_ato, _explicit));
}
/**
* return a CompressedData object from the given object.
*
* @param obj the object we want converted.
* @exception IllegalArgumentException if the object cannot be converted.
*/
public static CompressedData getInstance(
Object obj)
{
if (obj instanceof CompressedData)
{
return (CompressedData)obj;
}
if (obj != null)
{
return new CompressedData(ASN1Sequence.getInstance(obj));
}
return null;
}
public ASN1Integer getVersion()
{
return version;
}
public AlgorithmIdentifier getCompressionAlgorithmIdentifier()
{
return compressionAlgorithm;
}
public ContentInfo getEncapContentInfo()
{
return encapContentInfo;
}
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
v.add(version);
v.add(compressionAlgorithm);
v.add(encapContentInfo);
return new BERSequence(v);
}
}