init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Utilities/Collections/CollectionUtilities.cs

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+using System;
+using System.Collections;
+using System.Text;
+
+namespace Org.BouncyCastle.Utilities.Collections;
+
+public abstract class CollectionUtilities
+{
+	public static void AddRange(IList to, IEnumerable range)
+	{
+		foreach (object item in range)
+		{
+			to.Add(item);
+		}
+	}
+
+	public static bool CheckElementsAreOfType(IEnumerable e, Type t)
+	{
+		foreach (object item in e)
+		{
+			if (!t.IsInstanceOfType(item))
+			{
+				return false;
+			}
+		}
+		return true;
+	}
+
+	public static IDictionary ReadOnly(IDictionary d)
+	{
+		return new UnmodifiableDictionaryProxy(d);
+	}
+
+	public static IList ReadOnly(IList l)
+	{
+		return new UnmodifiableListProxy(l);
+	}
+
+	public static ISet ReadOnly(ISet s)
+	{
+		return new UnmodifiableSetProxy(s);
+	}
+
+	public static object RequireNext(IEnumerator e)
+	{
+		if (!e.MoveNext())
+		{
+			throw new InvalidOperationException();
+		}
+		return e.Current;
+	}
+
+	public static string ToString(IEnumerable c)
+	{
+		StringBuilder stringBuilder = new StringBuilder("[");
+		IEnumerator enumerator = c.GetEnumerator();
+		if (enumerator.MoveNext())
+		{
+			stringBuilder.Append(enumerator.Current.ToString());
+			while (enumerator.MoveNext())
+			{
+				stringBuilder.Append(", ");
+				stringBuilder.Append(enumerator.Current.ToString());
+			}
+		}
+		stringBuilder.Append(']');
+		return stringBuilder.ToString();
+	}
+}