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using System;
using System.Collections.Generic;
using System.IO;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Security.Certificates;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.X509
{
public class X509CertPairParser
{
private Stream currentStream;
private X509CertificatePair ReadDerCrossCertificatePair(
Stream inStream)
{
Asn1InputStream dIn = new Asn1InputStream(inStream);//, ProviderUtil.getReadLimit(in));
Asn1Sequence seq = (Asn1Sequence)dIn.ReadObject();
CertificatePair pair = CertificatePair.GetInstance(seq);
return new X509CertificatePair(pair);
}
/// <summary>
/// Create loading data from byte array.
/// </summary>
/// <param name="input"></param>
public X509CertificatePair ReadCertPair(byte[] input)
{
return ReadCertPair(new MemoryStream(input, false));
}
/// <summary>
/// Create loading data from byte array.
/// </summary>
/// <param name="input"></param>
public IList<X509CertificatePair> ReadCertPairs(byte[] input)
{
return ReadCertPairs(new MemoryStream(input, 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) // reset if input stream has changed
{
currentStream = inStream;
}
try
{
int tag = inStream.ReadByte();
if (tag < 0)
return null;
if (inStream.CanSeek)
{
inStream.Seek(-1L, SeekOrigin.Current);
}
else
{
PushbackStream pis = new PushbackStream(inStream);
pis.Unread(tag);
inStream = pis;
}
return ReadDerCrossCertificatePair(inStream);
}
catch (Exception e)
{
throw new CertificateException(e.ToString());
}
}
public IList<X509CertificatePair> ReadCertPairs(Stream inStream)
{
var certPairs = new List<X509CertificatePair>();
X509CertificatePair certPair;
while ((certPair = ReadCertPair(inStream)) != null)
{
certPairs.Add(certPair);
}
return certPairs;
}
}
}
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