init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Cms/CmsCompressedDataStreamGenerator.cs

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+using System.IO;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.Cms;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.IO;
+using Org.BouncyCastle.Utilities.Zlib;
+
+namespace Org.BouncyCastle.Cms;
+
+public class CmsCompressedDataStreamGenerator
+{
+	private class CmsCompressedOutputStream : BaseOutputStream
+	{
+		private ZOutputStream _out;
+
+		private BerSequenceGenerator _sGen;
+
+		private BerSequenceGenerator _cGen;
+
+		private BerSequenceGenerator _eiGen;
+
+		internal CmsCompressedOutputStream(ZOutputStream outStream, BerSequenceGenerator sGen, BerSequenceGenerator cGen, BerSequenceGenerator eiGen)
+		{
+			_out = outStream;
+			_sGen = sGen;
+			_cGen = cGen;
+			_eiGen = eiGen;
+		}
+
+		public override void WriteByte(byte b)
+		{
+			_out.WriteByte(b);
+		}
+
+		public override void Write(byte[] bytes, int off, int len)
+		{
+			_out.Write(bytes, off, len);
+		}
+
+		public override void Close()
+		{
+			Platform.Dispose(_out);
+			_eiGen.Close();
+			_cGen.Close();
+			_sGen.Close();
+			base.Close();
+		}
+	}
+
+	public const string ZLib = "1.2.840.113549.1.9.16.3.8";
+
+	private int _bufferSize;
+
+	public void SetBufferSize(int bufferSize)
+	{
+		_bufferSize = bufferSize;
+	}
+
+	public Stream Open(Stream outStream, string compressionOID)
+	{
+		return Open(outStream, CmsObjectIdentifiers.Data.Id, compressionOID);
+	}
+
+	public Stream Open(Stream outStream, string contentOID, string compressionOID)
+	{
+		BerSequenceGenerator berSequenceGenerator = new BerSequenceGenerator(outStream);
+		berSequenceGenerator.AddObject(CmsObjectIdentifiers.CompressedData);
+		BerSequenceGenerator berSequenceGenerator2 = new BerSequenceGenerator(berSequenceGenerator.GetRawOutputStream(), 0, isExplicit: true);
+		berSequenceGenerator2.AddObject(new DerInteger(0));
+		berSequenceGenerator2.AddObject(new AlgorithmIdentifier(new DerObjectIdentifier("1.2.840.113549.1.9.16.3.8")));
+		BerSequenceGenerator berSequenceGenerator3 = new BerSequenceGenerator(berSequenceGenerator2.GetRawOutputStream());
+		berSequenceGenerator3.AddObject(new DerObjectIdentifier(contentOID));
+		Stream output = CmsUtilities.CreateBerOctetOutputStream(berSequenceGenerator3.GetRawOutputStream(), 0, isExplicit: true, _bufferSize);
+		return new CmsCompressedOutputStream(new ZOutputStream(output, -1), berSequenceGenerator, berSequenceGenerator2, berSequenceGenerator3);
+	}
+}