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using System.Collections;
using System.IO;
namespace Org.BouncyCastle.Asn1
{
public class DerSequence
: Asn1Sequence
{
public static readonly DerSequence Empty = new DerSequence();
public static DerSequence FromVector(
Asn1EncodableVector v)
{
return v.Count < 1 ? Empty : new DerSequence(v);
}
/**
* create an empty sequence
*/
public DerSequence()
: base(0)
{
}
/**
* create a sequence containing one object
*/
public DerSequence(
Asn1Encodable obj)
: base(1)
{
AddObject(obj);
}
public DerSequence(
params Asn1Encodable[] v)
: base(v.Length)
{
foreach (Asn1Encodable ae in v)
{
AddObject(ae);
}
}
/**
* create a sequence containing a vector of objects.
*/
public DerSequence(
Asn1EncodableVector v)
: base(v.Count)
{
foreach (Asn1Encodable ae in v)
{
AddObject(ae);
}
}
/*
* 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)
{
// 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)
{
dOut.WriteObject(obj);
}
dOut.Dispose();
byte[] bytes = bOut.ToArray();
derOut.WriteEncoded(Asn1Tags.Sequence | Asn1Tags.Constructed, bytes);
}
}
}
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