Initial Commit

iTechSharp/srcbc/asn1/cms/CompressedData.cs

@@ -0,0 +1,100 @@
+using System;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+
+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: " + obj.GetType().Name);
+        }
+
+		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);
+        }
+    }
+}