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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public class DerSequence
: Asn1Sequence
{
public static readonly DerSequence Empty = new DerSequence();
public static DerSequence FromVector(Asn1EncodableVector elementVector)
{
return elementVector.Count < 1 ? Empty : new DerSequence(elementVector);
}
/**
* create an empty sequence
*/
public DerSequence()
: base()
{
}
/**
* create a sequence containing one object
*/
public DerSequence(Asn1Encodable element)
: base(element)
{
}
public DerSequence(params Asn1Encodable[] elements)
: base(elements)
{
}
/**
* create a sequence containing a vector of objects.
*/
public DerSequence(Asn1EncodableVector elementVector)
: base(elementVector)
{
}
/*
* 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 Sequence,
* we also have to specify Constructed, and the objects length.
*/
internal override void Encode(DerOutputStream derOut)
{
if (Count < 1)
{
derOut.WriteEncoded(Asn1Tags.Sequence | Asn1Tags.Constructed, Asn1OctetString.EmptyOctets);
return;
}
// TODO Intermediate buffer could be avoided if we could calculate expected length
MemoryStream bOut = new MemoryStream();
DerOutputStream dOut = new DerOutputStream(bOut);
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
derOut.WriteEncoded(Asn1Tags.Sequence | Asn1Tags.Constructed, bytes, 0, length);
Platform.Dispose(dOut);
}
}
}
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