Initial Commit

iTechSharp/srcbc/asn1/Asn1Set.cs

@@ -0,0 +1,307 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Asn1
+{
+    abstract public class Asn1Set
+        : Asn1Object, IEnumerable
+    {
+        private readonly ArrayList _set;
+
+		/**
+         * return an ASN1Set from the given object.
+         *
+         * @param obj the object we want converted.
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static Asn1Set GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is Asn1Set)
+            {
+                return (Asn1Set)obj;
+            }
+
+			throw new ArgumentException("Unknown object in GetInstance: " + obj.GetType().FullName, "obj");
+        }
+
+        /**
+         * Return an ASN1 set 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
+         * set - 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 sets 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 Asn1Set GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+			Asn1Object inner = obj.GetObject();
+
+			if (explicitly)
+            {
+                if (!obj.IsExplicit())
+                    throw new ArgumentException("object implicit - explicit expected.");
+
+				return (Asn1Set) inner;
+            }
+
+			//
+            // constructed object which appears to be explicitly tagged
+            // and it's really implicit means we have to add the
+            // surrounding sequence.
+            //
+            if (obj.IsExplicit())
+            {
+                return new DerSet(inner);
+            }
+
+			if (inner is Asn1Set)
+            {
+                return (Asn1Set) inner;
+            }
+
+            //
+            // in this case the parser returns a sequence, convert it
+            // into a set.
+            //
+			if (inner is Asn1Sequence)
+            {
+				Asn1EncodableVector v = new Asn1EncodableVector();
+				Asn1Sequence s = (Asn1Sequence) inner;
+
+				foreach (Asn1Encodable ae in s)
+				{
+                    v.Add(ae);
+                }
+
+				// TODO Should be able to construct set directly from sequence?
+				return new DerSet(v, false);
+            }
+
+			throw new ArgumentException("Unknown object in GetInstance: " + obj.GetType().FullName, "obj");
+		}
+
+		protected internal Asn1Set(
+			int capacity)
+        {
+			_set = new ArrayList(capacity);
+        }
+
+		public virtual IEnumerator GetEnumerator()
+		{
+			return _set.GetEnumerator();
+		}
+
+		[Obsolete("Use GetEnumerator() instead")]
+        public IEnumerator GetObjects()
+        {
+            return GetEnumerator();
+        }
+
+		/**
+         * return the object at the set position indicated by index.
+         *
+         * @param index the set number (starting at zero) of the object
+         * @return the object at the set position indicated by index.
+         */
+		public virtual Asn1Encodable this[int index]
+		{
+			get { return (Asn1Encodable) _set[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 _set.Count; }
+		}
+
+		private class Asn1SetParserImpl
+			: Asn1SetParser
+		{
+			private readonly Asn1Set outer;
+			private readonly int max;
+			private int index;
+
+			public Asn1SetParserImpl(
+				Asn1Set 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 virtual Asn1Object ToAsn1Object()
+			{
+				return outer;
+			}
+		}
+
+		public Asn1SetParser Parser
+		{
+			get { return new Asn1SetParserImpl(this); }
+		}
+
+		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)
+        {
+			Asn1Set other = asn1Object as Asn1Set;
+
+			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;
+        }
+
+		/**
+         * return true if a &lt;= b (arrays are assumed padded with zeros).
+         */
+        private bool LessThanOrEqual(
+             byte[] a,
+             byte[] b)
+        {
+			int cmpLen = System.Math.Min(a.Length, b.Length);
+
+			for (int i = 0; i < cmpLen; ++i)
+			{
+				byte l = a[i];
+				byte r = b[i];
+
+				if (l != r)
+				{
+					return r > l ? true : false;
+				}
+			}
+
+			return a.Length <= b.Length;
+        }
+
+		protected internal void Sort()
+        {
+			if (_set.Count > 1)
+			{
+				bool swapped = true;
+				int lastSwap = _set.Count - 1;
+
+				while (swapped)
+				{
+					int index = 0;
+					int swapIndex = 0;
+					byte[] a = ((Asn1Encodable) _set[0]).GetEncoded();
+
+					swapped = false;
+
+					while (index != lastSwap)
+					{
+						byte[] b = ((Asn1Encodable) _set[index + 1]).GetEncoded();
+
+						if (LessThanOrEqual(a, b))
+						{
+							a = b;
+						}
+						else
+						{
+							object o = _set[index];
+							_set[index] = _set[index + 1];
+							_set[index + 1] = o;
+
+							swapped = true;
+							swapIndex = index;
+						}
+
+						index++;
+					}
+
+					lastSwap = swapIndex;
+				}
+			}
+        }
+
+		protected internal void AddObject(
+			Asn1Encodable obj)
+        {
+            _set.Add(obj);
+        }
+
+		public override string ToString()
+		{
+			return CollectionUtilities.ToString(_set);
+		}
+	}
+}