Initial import of old CVS repository

1 files changed, 268 insertions, 0 deletions

diff --git a/crypto/src/asn1/Asn1Sequence.cs b/crypto/src/asn1/Asn1Sequence.cs
new file mode 100644
index 000000000..5f9ea4460
--- /dev/null
+++ b/crypto/src/asn1/Asn1Sequence.cs
@@ -0,0 +1,268 @@
+using System;
+using System.Collections;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Asn1
+{
+    public abstract class Asn1Sequence
+        : Asn1Object, IEnumerable
+    {
+        private readonly IList 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;
+            }
+            else if (obj is Asn1SequenceParser)
+            {
+                return Asn1Sequence.GetInstance(((Asn1SequenceParser)obj).ToAsn1Object());
+            }
+            else if (obj is byte[])
+            {
+                try
+                {
+                    return Asn1Sequence.GetInstance(FromByteArray((byte[])obj));
+                }
+                catch (IOException e)
+                {
+                    throw new ArgumentException("failed to construct sequence from byte[]: " + e.Message);
+                }
+            }
+            else if (obj is Asn1Encodable)
+            {
+                Asn1Object primitive = ((Asn1Encodable)obj).ToAsn1Object();
+                
+                if (primitive is Asn1Sequence)
+                {
+                    return (Asn1Sequence)primitive;
+                }
+            }
+
+            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 = Platform.CreateArrayList(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 ^= DerNull.Instance.GetHashCode();
+                }
+                else
+                {
+                    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())
+            {
+                Asn1Object o1 = GetCurrent(s1).ToAsn1Object();
+                Asn1Object o2 = GetCurrent(s2).ToAsn1Object();
+
+                if (!o1.Equals(o2))
+                    return false;
+            }
+
+            return true;
+        }
+
+        private Asn1Encodable GetCurrent(IEnumerator e)
+        {
+            Asn1Encodable encObj = (Asn1Encodable)e.Current;
+
+            // unfortunately null was allowed as a substitute for DER null
+            if (encObj == null)
+                return DerNull.Instance;
+
+            return encObj;
+        }
+
+        protected internal void AddObject(
+            Asn1Encodable obj)
+        {
+            seq.Add(obj);
+        }
+
+        public override string ToString()
+        {
+            return CollectionUtilities.ToString(seq);
+        }
+    }
+}