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using System;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
/**
* A Der encoded set object
*/
public class DerSet
: Asn1Set
{
public static readonly DerSet Empty = new DerSet();
public static DerSet FromVector(Asn1EncodableVector elementVector)
{
return elementVector.Count < 1 ? Empty : new DerSet(elementVector);
}
internal static DerSet FromVector(Asn1EncodableVector elementVector, bool needsSorting)
{
return elementVector.Count < 1 ? Empty : new DerSet(elementVector, needsSorting);
}
/**
* create an empty set
*/
public DerSet()
: base()
{
}
/**
* @param obj - a single object that makes up the set.
*/
public DerSet(Asn1Encodable element)
: base(element)
{
}
public DerSet(params Asn1Encodable[] elements)
: base(elements)
{
Sort();
}
/**
* @param v - a vector of objects making up the set.
*/
public DerSet(Asn1EncodableVector elementVector)
: this(elementVector, true)
{
}
internal DerSet(Asn1EncodableVector elementVector, bool needsSorting)
: base(elementVector)
{
if (needsSorting)
{
Sort();
}
}
/*
* A note on the implementation:
* <p>
* As Der requires the constructed, definite-length model to
* be used for structured types, this varies slightly from the
* ASN.1 descriptions given. Rather than just outputing Set,
* we also have to specify Constructed, and the objects length.
*/
internal override void Encode(Asn1OutputStream asn1Out)
{
if (Count < 1)
{
asn1Out.WriteEncoded(Asn1Tags.Set | Asn1Tags.Constructed, Asn1OctetString.EmptyOctets);
return;
}
// TODO Intermediate buffer could be avoided if we could calculate expected length
MemoryStream bOut = new MemoryStream();
Asn1OutputStream dOut = Asn1OutputStream.Create(bOut, Asn1Encodable.Der);
foreach (Asn1Encodable obj in this)
{
obj.ToAsn1Object().Encode(dOut);
}
dOut.Flush();
#if PORTABLE
byte[] bytes = bOut.ToArray();
int length = bytes.Length;
#else
byte[] bytes = bOut.GetBuffer();
int length = (int)bOut.Position;
#endif
asn1Out.WriteEncoded(Asn1Tags.Set | Asn1Tags.Constructed, bytes, 0, length);
Platform.Dispose(dOut);
}
}
}
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