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Assets/BestHTTP/SecureProtocol/asn1/Asn1Set.cs

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+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+using System;
+using System.Collections;
+using System.IO;
+
+#if PORTABLE || NETFX_CORE
+using System.Collections.Generic;
+using System.Linq;
+#endif
+
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Asn1
+{
+    abstract public class Asn1Set
+        : Asn1Object, IEnumerable
+    {
+        private readonly IList _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;
+            }
+            else if (obj is Asn1SetParser)
+            {
+                return Asn1Set.GetInstance(((Asn1SetParser)obj).ToAsn1Object());
+            }
+            else if (obj is byte[])
+            {
+                try
+                {
+                    return Asn1Set.GetInstance(FromByteArray((byte[])obj));
+                }
+                catch (IOException e)
+                {
+                    throw new ArgumentException("failed to construct set from byte[]: " + e.Message);
+                }
+            }
+            else if (obj is Asn1Encodable)
+            {
+                Asn1Object primitive = ((Asn1Encodable)obj).ToAsn1Object();
+
+                if (primitive is Asn1Set)
+                {
+                    return (Asn1Set)primitive;
+                }
+            }
+
+            throw new ArgumentException("Unknown object in GetInstance: " + Platform.GetTypeName(obj), "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: " + Platform.GetTypeName(obj), "obj");
+        }
+
+        protected internal Asn1Set(
+            int capacity)
+        {
+            _set = Platform.CreateArrayList(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; }
+        }
+
+        public virtual Asn1Encodable[] ToArray()
+        {
+            Asn1Encodable[] values = new Asn1Encodable[this.Count];
+            for (int i = 0; i < this.Count; ++i)
+            {
+                values[i] = this[i];
+            }
+            return values;
+        }
+
+        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 ^= DerNull.Instance.GetHashCode();
+                }
+                else
+                {
+                    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())
+            {
+                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 Sort()
+        {
+            if (_set.Count < 2)
+                return;
+
+#if PORTABLE || NETFX_CORE
+            var sorted = _set.Cast<Asn1Encodable>()
+                             .Select(a => new { Item = a, Key = a.GetEncoded(Asn1Encodable.Der) })
+                             .OrderBy(t => t.Key, new DerComparer())
+                             .Select(t => t.Item)
+                             .ToList();
+
+            for (int i = 0; i < _set.Count; ++i)
+            {
+                _set[i] = sorted[i];
+            }
+#else
+            Asn1Encodable[] items = new Asn1Encodable[_set.Count];
+            byte[][] keys = new byte[_set.Count][];
+
+            for (int i = 0; i < _set.Count; ++i)
+            {
+                Asn1Encodable item = (Asn1Encodable)_set[i];
+                items[i] = item;
+                keys[i] = item.GetEncoded(Asn1Encodable.Der);
+            }
+
+            Array.Sort(keys, items, new DerComparer());
+
+            for (int i = 0; i < _set.Count; ++i)
+            {
+                _set[i] = items[i];
+            }
+#endif
+        }
+
+        protected internal void AddObject(Asn1Encodable obj)
+        {
+            _set.Add(obj);
+        }
+
+        public override string ToString()
+        {
+            return CollectionUtilities.ToString(_set);
+        }
+
+#if PORTABLE || NETFX_CORE
+        private class DerComparer
+            : IComparer<byte[]>
+        {
+            public int Compare(byte[] x, byte[] y)
+            {
+                byte[] a = x, b = y;
+#else
+        private class DerComparer
+            : IComparer
+        {
+            public int Compare(object x, object y)
+            {
+                byte[] a = (byte[])x, b = (byte[])y;
+#endif
+                int len = System.Math.Min(a.Length, b.Length);
+                for (int i = 0; i != len; ++i)
+                {
+                    byte ai = a[i], bi = b[i];
+                    if (ai != bi)
+                        return ai < bi ? -1 : 1;
+                }
+                if (a.Length > b.Length)
+                    return AllZeroesFrom(a, len) ? 0 : 1;
+                if (a.Length < b.Length)
+                    return AllZeroesFrom(b, len) ? 0 : -1;
+                return 0;
+            }
+
+            private bool AllZeroesFrom(byte[] bs, int pos)
+            {
+                while (pos < bs.Length)
+                {
+                    if (bs[pos++] != 0)
+                        return false;
+                }
+                return true;
+            }
+        }
+    }
+}
+
+#endif