Add DLSequence, DLSet for internal use

- improve sorting of sets

1 files changed, 96 insertions, 0 deletions

diff --git a/crypto/src/asn1/DLSequence.cs b/crypto/src/asn1/DLSequence.cs
new file mode 100644
index 000000000..56a0e6932
--- /dev/null
+++ b/crypto/src/asn1/DLSequence.cs
@@ -0,0 +1,96 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1
+{
+    internal class DLSequence
+        : DerSequence
+    {
+        internal static new readonly DLSequence Empty = new DLSequence();
+
+        internal static new DLSequence FromVector(Asn1EncodableVector elementVector)
+        {
+            return elementVector.Count < 1 ? Empty : new DLSequence(elementVector);
+        }
+
+        /**
+		 * create an empty sequence
+		 */
+        internal DLSequence()
+            : base()
+        {
+        }
+
+        /**
+		 * create a sequence containing one object
+		 */
+        internal DLSequence(Asn1Encodable element)
+            : base(element)
+        {
+        }
+
+        internal DLSequence(params Asn1Encodable[] elements)
+            : base(elements)
+        {
+        }
+
+        /**
+		 * create a sequence containing a vector of objects.
+		 */
+        internal DLSequence(Asn1EncodableVector elementVector)
+            : base(elementVector)
+        {
+        }
+
+        internal DLSequence(Asn1Encodable[] elements, bool clone)
+            : base(elements, clone)
+        {
+        }
+
+        internal override int EncodedLength(bool withID)
+        {
+            throw Platform.CreateNotImplementedException("DLSequence.EncodedLength");
+        }
+
+        internal override void Encode(Asn1OutputStream asn1Out, bool withID)
+        {
+            if (asn1Out.IsDer)
+            {
+                base.Encode(asn1Out, withID);
+                return;
+            }
+
+            if (Count < 1)
+            {
+                asn1Out.WriteEncodingDL(withID, Asn1Tags.Constructed | Asn1Tags.Sequence, Asn1OctetString.EmptyOctets);
+                return;
+            }
+
+            // TODO Intermediate buffer could be avoided if we could calculate expected length
+            MemoryStream bOut = new MemoryStream();
+            // TODO Once DLOutputStream exists, this should create one
+            Asn1OutputStream dOut = Asn1OutputStream.Create(bOut);
+            dOut.WriteElements(elements);
+            dOut.FlushInternal();
+
+#if PORTABLE
+            byte[] bytes = bOut.ToArray();
+            int length = bytes.Length;
+#else
+            byte[] bytes = bOut.GetBuffer();
+            int length = (int)bOut.Position;
+#endif
+
+            asn1Out.WriteEncodingDL(withID, Asn1Tags.Constructed | Asn1Tags.Sequence, bytes, 0, length);
+
+            Platform.Dispose(dOut);
+        }
+
+        internal override Asn1Set ToAsn1Set()
+        {
+            return new DLSet(false, elements);
+        }
+    }
+}