CMSTypedStream.cs :  » PDF » iTextSharp » Org » BouncyCastle » Cms » C# / CSharp Open Source

using System;
using System.IO;

using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Utilities.IO;

namespace Org.BouncyCastle.Cms{
  public class CmsTypedStream
  {
    private const int BufferSize = 32 * 1024;

    private readonly string  _oid;
    private readonly Stream  _in;

    public CmsTypedStream(
      Stream inStream)
      : this(PkcsObjectIdentifiers.Data.Id, inStream, BufferSize)
    {
    }

    public CmsTypedStream(
      string oid,
      Stream inStream)
      : this(oid, inStream, BufferSize)
    {
    }

    public CmsTypedStream(
      string  oid,
      Stream  inStream,
      int    bufSize)
    {
      _oid = oid;
      _in = new FullReaderStream(inStream, bufSize);
    }

    public string ContentType
    {
      get { return _oid; }
    }

    public Stream ContentStream
    {
      get { return _in; }
    }

    public void Drain()
    {
      Streams.Drain(_in);
      _in.Close();
    }

    private class FullReaderStream
      : BaseInputStream
    {
      internal Stream _stream;

      internal FullReaderStream(
        Stream  inStream,
        int    bufSize)
      {
        _stream = inStream;
      }

      public override int ReadByte()
      {
        return _stream.ReadByte();
      }

      public override int Read(
        byte[]  buf,
        int    off,
        int    len)
      {
        return Streams.ReadFully(_stream, buf, off, len);
      }

      public override void Close()
      {
        _stream.Close();
        base.Close();
      }
    }
  }
}