Initial Commit

iTechSharp/srcbc/asn1/Asn1Sequence.cs

@@ -0,0 +1,231 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Asn1
+{
+    public abstract class Asn1Sequence
+		: Asn1Object, IEnumerable
+    {
+        private readonly ArrayList seq;
+
+		/**
+         * return an Asn1Sequence from the given object.
+         *
+         * @param obj the object we want converted.
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static Asn1Sequence GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is Asn1Sequence)
+            {
+                return (Asn1Sequence)obj;
+            }
+
+			throw new ArgumentException("Unknown object in GetInstance: " + obj.GetType().FullName, "obj");
+		}
+
+		/**
+         * Return an ASN1 sequence from a tagged object. There is a special
+         * case here, if an object appears to have been explicitly tagged on
+         * reading but we were expecting it to be implicitly tagged in the
+         * normal course of events it indicates that we lost the surrounding
+         * sequence - so we need to add it back (this will happen if the tagged
+         * object is a sequence that contains other sequences). If you are
+         * dealing with implicitly tagged sequences you really <b>should</b>
+         * be using this method.
+         *
+         * @param obj the tagged object.
+         * @param explicitly true if the object is meant to be explicitly tagged,
+         *          false otherwise.
+         * @exception ArgumentException if the tagged object cannot
+         *          be converted.
+         */
+        public static Asn1Sequence GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+			Asn1Object inner = obj.GetObject();
+
+			if (explicitly)
+            {
+                if (!obj.IsExplicit())
+                    throw new ArgumentException("object implicit - explicit expected.");
+
+				return (Asn1Sequence) inner;
+            }
+
+			//
+            // constructed object which appears to be explicitly tagged
+            // when it should be implicit means we have to add the
+            // surrounding sequence.
+            //
+            if (obj.IsExplicit())
+            {
+                if (obj is BerTaggedObject)
+                {
+                    return new BerSequence(inner);
+                }
+
+				return new DerSequence(inner);
+            }
+
+			if (inner is Asn1Sequence)
+            {
+                return (Asn1Sequence) inner;
+            }
+
+			throw new ArgumentException("Unknown object in GetInstance: " + obj.GetType().FullName, "obj");
+		}
+
+		protected internal Asn1Sequence(
+			int capacity)
+		{
+			seq = new ArrayList(capacity);
+		}
+
+		public virtual IEnumerator GetEnumerator()
+		{
+			return seq.GetEnumerator();
+		}
+
+		[Obsolete("Use GetEnumerator() instead")]
+		public IEnumerator GetObjects()
+        {
+            return GetEnumerator();
+        }
+
+		private class Asn1SequenceParserImpl
+			: Asn1SequenceParser
+		{
+			private readonly Asn1Sequence outer;
+			private readonly int max;
+			private int index;
+
+			public Asn1SequenceParserImpl(
+				Asn1Sequence outer)
+			{
+				this.outer = outer;
+				this.max = outer.Count;
+			}
+
+			public IAsn1Convertible ReadObject()
+			{
+				if (index == max)
+					return null;
+
+				Asn1Encodable obj = outer[index++];
+
+				if (obj is Asn1Sequence)
+					return ((Asn1Sequence)obj).Parser;
+
+				if (obj is Asn1Set)
+					return ((Asn1Set)obj).Parser;
+
+				// NB: Asn1OctetString implements Asn1OctetStringParser directly
+//				if (obj is Asn1OctetString)
+//					return ((Asn1OctetString)obj).Parser;
+
+				return obj;
+			}
+
+			public Asn1Object ToAsn1Object()
+			{
+				return outer;
+			}
+		}
+
+		public virtual Asn1SequenceParser Parser
+		{
+			get { return new Asn1SequenceParserImpl(this); }
+		}
+
+        /**
+         * return the object at the sequence position indicated by index.
+         *
+         * @param index the sequence number (starting at zero) of the object
+         * @return the object at the sequence position indicated by index.
+         */
+		public virtual Asn1Encodable this[int index]
+		{
+			get { return (Asn1Encodable) seq[index]; }
+		}
+
+		[Obsolete("Use 'object[index]' syntax instead")]
+        public Asn1Encodable GetObjectAt(
+            int index)
+        {
+             return this[index];
+        }
+
+		[Obsolete("Use 'Count' property instead")]
+		public int Size
+        {
+			get { return Count; }
+        }
+
+		public virtual int Count
+		{
+			get { return seq.Count; }
+		}
+
+		protected override int Asn1GetHashCode()
+		{
+			int hc = Count;
+
+			foreach (object o in this)
+			{
+				hc *= 17;
+				if (o != null)
+                {
+					hc ^= o.GetHashCode();
+                }
+            }
+
+			return hc;
+        }
+
+		protected override bool Asn1Equals(
+			Asn1Object asn1Object)
+		{
+			Asn1Sequence other = asn1Object as Asn1Sequence;
+
+			if (other == null)
+                return false;
+
+			if (Count != other.Count)
+            {
+                return false;
+            }
+
+            IEnumerator s1 = GetEnumerator();
+            IEnumerator s2 = other.GetEnumerator();
+
+			while (s1.MoveNext() && s2.MoveNext())
+			{
+//				if (!Platform.Equals(s1.Current, s2.Current))
+				Asn1Object o1 = ((Asn1Encodable) s1.Current).ToAsn1Object();
+
+				if (!o1.Equals(s2.Current))
+				{
+					return false;
+				}
+			}
+
+			return true;
+        }
+
+		protected internal void AddObject(
+            Asn1Encodable obj)
+        {
+            seq.Add(obj);
+        }
+
+		public override string ToString()
+		{
+			return CollectionUtilities.ToString(seq);
+		}
+    }
+}