PgpCompressedData.cs :  » PDF » iTextSharp » Org » BouncyCastle » Bcpg » OpenPgp » C# / CSharp Open Source

using System.IO;

using Org.BouncyCastle.Apache.Bzip2;
using Org.BouncyCastle.Utilities.Zlib;

namespace Org.BouncyCastle.Bcpg.OpenPgp{
  /// <remarks>Compressed data objects</remarks>
    public class PgpCompressedData
    : PgpObject
    {
        private readonly CompressedDataPacket data;

    public PgpCompressedData(
            BcpgInputStream bcpgInput)
        {
            data = (CompressedDataPacket) bcpgInput.ReadPacket();
        }

    /// <summary>The algorithm used for compression</summary>
        public CompressionAlgorithmTag Algorithm
        {
      get { return data.Algorithm; }
        }

    /// <summary>Get the raw input stream contained in the object.</summary>
        public Stream GetInputStream()
        {
            return data.GetInputStream();
        }

    /// <summary>Return an uncompressed input stream which allows reading of the compressed data.</summary>
        public Stream GetDataStream()
        {
            switch (Algorithm)
            {
        case CompressionAlgorithmTag.Uncompressed:
          return GetInputStream();
        case CompressionAlgorithmTag.Zip:
          return new ZInflaterInputStream(GetInputStream(), true);
                case CompressionAlgorithmTag.ZLib:
          return new ZInflaterInputStream(GetInputStream());
        case CompressionAlgorithmTag.BZip2:
          return new CBZip2InputStream(GetInputStream());
                default:
                    throw new PgpException("can't recognise compression algorithm: " + Algorithm);
            }
        }
    }
}