init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Bcpg/OpenPgp/PgpCompressedData.cs

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+using System.IO;
+using Org.BouncyCastle.Apache.Bzip2;
+using Org.BouncyCastle.Utilities.Zlib;
+
+namespace Org.BouncyCastle.Bcpg.OpenPgp;
+
+public class PgpCompressedData : PgpObject
+{
+	private readonly CompressedDataPacket data;
+
+	public CompressionAlgorithmTag Algorithm => data.Algorithm;
+
+	public PgpCompressedData(BcpgInputStream bcpgInput)
+	{
+		data = (CompressedDataPacket)bcpgInput.ReadPacket();
+	}
+
+	public Stream GetInputStream()
+	{
+		return data.GetInputStream();
+	}
+
+	public Stream GetDataStream()
+	{
+		return Algorithm switch
+		{
+			CompressionAlgorithmTag.Uncompressed => GetInputStream(), 
+			CompressionAlgorithmTag.Zip => new ZInputStream(GetInputStream(), nowrap: true), 
+			CompressionAlgorithmTag.ZLib => new ZInputStream(GetInputStream()), 
+			CompressionAlgorithmTag.BZip2 => new CBZip2InputStream(GetInputStream()), 
+			_ => throw new PgpException("can't recognise compression algorithm: " + Algorithm), 
+		};
+	}
+}