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