LazyDERSequence.cs :  » PDF » iTextSharp » Org » BouncyCastle » Asn1 » C# / CSharp Open Source

using System;
using System.Collections;
using System.Diagnostics;

namespace Org.BouncyCastle.Asn1{
  internal class LazyDerSequence
    : DerSequence
  {
    private byte[]  encoded;
    private bool  parsed = false;

    internal LazyDerSequence(
      byte[] encoded)
    {
      this.encoded = encoded;
    }

    private void Parse()
    {
      Debug.Assert(parsed == false);

      Asn1InputStream e = new LazyAsn1InputStream(encoded);

      Asn1Object o;
      while ((o = e.ReadObject()) != null)
      {
        AddObject(o);
      }

      encoded = null;
      parsed = true;
    }

    public override Asn1Encodable this[int index]
    {
      get
      {
        if (!parsed)
        {
          Parse();
        }

        return base[index];
      }
    }

    public override IEnumerator GetEnumerator()
    {
      if (!parsed)
      {
        Parse();
      }

      return base.GetEnumerator();
    }

    public override int Count
    {
      get
      {
        if (!parsed)
        {
          Parse();
        }

        return base.Count;
      }
    }

    internal override void Encode(
      DerOutputStream derOut)
    {
      if (parsed)
      {
        base.Encode(derOut);
      }
      else
      {
        derOut.WriteEncoded(Asn1Tags.Sequence | Asn1Tags.Constructed, encoded);
      }
    }
  }
}