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using System;
using System.Collections;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.Cms
{
public class ContentInfo
: Asn1Encodable
{
private readonly DerObjectIdentifier contentType;
private readonly Asn1Encodable content;
public static ContentInfo GetInstance(
object obj)
{
if (obj == null || obj is ContentInfo)
return (ContentInfo) obj;
if (obj is Asn1Sequence)
return new ContentInfo((Asn1Sequence) obj);
throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(obj));
}
public static ContentInfo GetInstance(Asn1TaggedObject obj, bool isExplicit)
{
return GetInstance(Asn1Sequence.GetInstance(obj, isExplicit));
}
private ContentInfo(
Asn1Sequence seq)
{
if (seq.Count < 1 || seq.Count > 2)
throw new ArgumentException("Bad sequence size: " + seq.Count, "seq");
contentType = (DerObjectIdentifier) seq[0];
if (seq.Count > 1)
{
Asn1TaggedObject tagged = (Asn1TaggedObject) seq[1];
if (!tagged.IsExplicit() || tagged.TagNo != 0)
throw new ArgumentException("Bad tag for 'content'", "seq");
content = tagged.GetObject();
}
}
public ContentInfo(
DerObjectIdentifier contentType,
Asn1Encodable content)
{
this.contentType = contentType;
this.content = content;
}
public DerObjectIdentifier ContentType
{
get { return contentType; }
}
public Asn1Encodable Content
{
get { return content; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* ContentInfo ::= Sequence {
* contentType ContentType,
* content
* [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(contentType);
if (content != null)
{
v.Add(new BerTaggedObject(0, content));
}
return new BerSequence(v);
}
}
}
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