Initial Commit

iTechSharp/srcbc/asn1/cms/ContentInfo.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1;
+
+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: " + obj.GetType().Name);
+		}
+
+		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 optOcts = (Asn1TaggedObject) seq[1];
+				if (optOcts.TagNo != 0)
+					throw new ArgumentException("Tag number for 'content' must be 0");
+
+				content = optOcts.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);
+		}
+	}
+}