init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/X509/X509CertPairParser.cs

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+using System;
+using System.Collections;
+using System.IO;
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Asn1.X509;
+using Org.BouncyCastle.Security.Certificates;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.IO;
+
+namespace Org.BouncyCastle.X509;
+
+public class X509CertPairParser
+{
+	private Stream currentStream;
+
+	private X509CertificatePair ReadDerCrossCertificatePair(Stream inStream)
+	{
+		Asn1InputStream asn1InputStream = new Asn1InputStream(inStream);
+		Asn1Sequence obj = (Asn1Sequence)asn1InputStream.ReadObject();
+		CertificatePair instance = CertificatePair.GetInstance(obj);
+		return new X509CertificatePair(instance);
+	}
+
+	public X509CertificatePair ReadCertPair(byte[] input)
+	{
+		return ReadCertPair(new MemoryStream(input, writable: false));
+	}
+
+	public ICollection ReadCertPairs(byte[] input)
+	{
+		return ReadCertPairs(new MemoryStream(input, writable: false));
+	}
+
+	public X509CertificatePair ReadCertPair(Stream inStream)
+	{
+		if (inStream == null)
+		{
+			throw new ArgumentNullException("inStream");
+		}
+		if (!inStream.CanRead)
+		{
+			throw new ArgumentException("inStream must be read-able", "inStream");
+		}
+		if (currentStream == null)
+		{
+			currentStream = inStream;
+		}
+		else if (currentStream != inStream)
+		{
+			currentStream = inStream;
+		}
+		try
+		{
+			PushbackStream pushbackStream = new PushbackStream(inStream);
+			int num = pushbackStream.ReadByte();
+			if (num < 0)
+			{
+				return null;
+			}
+			pushbackStream.Unread(num);
+			return ReadDerCrossCertificatePair(pushbackStream);
+		}
+		catch (Exception ex)
+		{
+			throw new CertificateException(ex.ToString());
+		}
+	}
+
+	public ICollection ReadCertPairs(Stream inStream)
+	{
+		IList list = Platform.CreateArrayList();
+		X509CertificatePair value;
+		while ((value = ReadCertPair(inStream)) != null)
+		{
+			list.Add(value);
+		}
+		return list;
+	}
+}