Initial Commit

iTechSharp/srcbc/asn1/DerBoolean.cs

@@ -0,0 +1,110 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1
+{
+    public class DerBoolean
+        : Asn1Object
+    {
+        private readonly byte value;
+
+		public static readonly DerBoolean False = new DerBoolean(false);
+        public static readonly DerBoolean True  = new DerBoolean(true);
+
+		/**
+         * return a bool from the passed in object.
+         *
+         * @exception ArgumentException if the object cannot be converted.
+         */
+        public static DerBoolean GetInstance(
+            object obj)
+        {
+            if (obj == null || obj is DerBoolean)
+            {
+                return (DerBoolean) obj;
+            }
+
+			if (obj is Asn1OctetString)
+            {
+                return new DerBoolean(((Asn1OctetString) obj).GetOctets());
+            }
+
+			if (obj is Asn1TaggedObject)
+            {
+                return GetInstance(((Asn1TaggedObject) obj).GetObject());
+            }
+
+			throw new ArgumentException("illegal object in GetInstance: " + obj.GetType().Name);
+        }
+
+		/**
+         * return a DerBoolean from the passed in bool.
+         */
+        public static DerBoolean GetInstance(
+            bool value)
+        {
+            return value ? True : False;
+        }
+
+		/**
+         * return a Boolean from a tagged object.
+         *
+         * @param obj 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 tagged object cannot
+         *               be converted.
+         */
+        public static DerBoolean GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+            return GetInstance(obj.GetObject());
+        }
+
+		public DerBoolean(
+            byte[] value)
+        {
+			// TODO Are there any constraints on the possible byte values?
+            this.value = value[0];
+        }
+
+		private DerBoolean(
+            bool value)
+        {
+            this.value = value ? (byte)0xff : (byte)0;
+        }
+
+		public bool IsTrue
+		{
+			get { return value != 0; }
+		}
+
+		internal override void Encode(
+            DerOutputStream derOut)
+        {
+			// TODO Should we make sure the byte value is one of '0' or '0xff' here?
+			derOut.WriteEncoded(Asn1Tags.Boolean, new byte[]{ value });
+        }
+
+		protected override bool Asn1Equals(
+			Asn1Object asn1Object)
+        {
+			DerBoolean other = asn1Object as DerBoolean;
+
+			if (other == null)
+				return false;
+
+			return IsTrue == other.IsTrue;
+        }
+
+		protected override int Asn1GetHashCode()
+		{
+			return IsTrue.GetHashCode();
+        }
+
+		public override string ToString()
+		{
+			return IsTrue ? "TRUE" : "FALSE";
+		}
+	}
+}