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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public sealed class Asn1ObjectDescriptor
: Asn1Object
{
/**
* Return an ObjectDescriptor from the passed in object.
*
* @param obj an ASN1ObjectDescriptor or an object that can be converted into one.
* @exception IllegalArgumentException if the object cannot be converted.
* @return an ASN1ObjectDescriptor instance, or null.
*/
public static Asn1ObjectDescriptor GetInstance(object obj)
{
if (obj == null || obj is Asn1ObjectDescriptor)
{
return (Asn1ObjectDescriptor)obj;
}
else if (obj is IAsn1Convertible)
{
Asn1Object asn1Object = ((IAsn1Convertible)obj).ToAsn1Object();
if (asn1Object is Asn1ObjectDescriptor)
return (Asn1ObjectDescriptor)asn1Object;
}
else if (obj is byte[])
{
try
{
return GetInstance(FromByteArray((byte[])obj));
}
catch (IOException e)
{
throw new ArgumentException("failed to construct object descriptor from byte[]: " + e.Message);
}
}
throw new ArgumentException("illegal object in GetInstance: " + Platform.GetTypeName(obj), "obj");
}
/**
* Return an ObjectDescriptor from a tagged object.
*
* @param taggedObject the tagged object holding the object we want.
* @param explicit true if the object is meant to be explicitly tagged,
* false otherwise.
* @exception IllegalArgumentException if the tagged object cannot be converted.
* @return an ASN1ObjectDescriptor instance, or null.
*/
public static Asn1ObjectDescriptor GetInstance(Asn1TaggedObject taggedObject, bool isExplicit)
{
Asn1Object baseObject = taggedObject.GetObject();
if (isExplicit || baseObject is Asn1ObjectDescriptor)
{
return GetInstance(baseObject);
}
return new Asn1ObjectDescriptor(new DerGraphicString(((Asn1OctetString)baseObject).GetOctets()));
}
private readonly DerGraphicString m_baseGraphicString;
public Asn1ObjectDescriptor(DerGraphicString baseGraphicString)
{
if (null == baseGraphicString)
throw new ArgumentNullException("baseGraphicString");
this.m_baseGraphicString = baseGraphicString;
}
public DerGraphicString BaseGraphicString
{
get { return m_baseGraphicString; }
}
internal override bool EncodeConstructed(int encoding)
{
return false;
}
internal override int EncodedLength(int encoding, bool withID)
{
return m_baseGraphicString.EncodedLength(encoding, withID);
}
internal override void Encode(Asn1OutputStream asn1Out, bool withID)
{
asn1Out.WriteIdentifier(withID, Asn1Tags.ObjectDescriptor);
m_baseGraphicString.Encode(asn1Out, false);
}
protected override int Asn1GetHashCode()
{
return ~m_baseGraphicString.CallAsn1GetHashCode();
}
protected override bool Asn1Equals(Asn1Object asn1Object)
{
Asn1ObjectDescriptor that = asn1Object as Asn1ObjectDescriptor;
return null != that
&& this.m_baseGraphicString.CallAsn1Equals(that.m_baseGraphicString);
}
internal static Asn1ObjectDescriptor CreatePrimitive(byte[] contents)
{
return new Asn1ObjectDescriptor(DerGraphicString.CreatePrimitive(contents));
}
}
}
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