Asn1Null
using Org.BouncyCastle.Utilities;
using System;
using System.IO;
namespace Org.BouncyCastle.Asn1
{
public abstract class Asn1Null : Asn1Object
{
internal class Meta : Asn1UniversalType
{
internal static readonly Asn1UniversalType Instance = new Meta();
private Meta()
: base(typeof(Asn1Null), 5)
{
}
internal override Asn1Object FromImplicitPrimitive(DerOctetString octetString)
{
return CreatePrimitive(octetString.GetOctets());
}
}
public static Asn1Null GetInstance(object obj)
{
if (obj == null)
return null;
Asn1Null asn1Null = obj as Asn1Null;
if (asn1Null != null)
return asn1Null;
IAsn1Convertible asn1Convertible = obj as IAsn1Convertible;
if (asn1Convertible != null) {
Asn1Null asn1Null2 = asn1Convertible.ToAsn1Object() as Asn1Null;
if (asn1Null2 != null)
return asn1Null2;
} else {
byte[] array = obj as byte[];
if (array != null)
try {
return (Asn1Null)Meta.Instance.FromByteArray(array);
} catch (IOException ex) {
throw new ArgumentException("failed to construct NULL from byte[]: " + ex.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj));
}
public static Asn1Null GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return (Asn1Null)Meta.Instance.GetContextInstance(taggedObject, declaredExplicit);
}
internal Asn1Null()
{
}
public override string ToString()
{
return "NULL";
}
internal static Asn1Null CreatePrimitive(byte[] contents)
{
if (contents.Length != 0)
throw new InvalidOperationException("malformed NULL encoding encountered");
return DerNull.Instance;
}
}
}