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using System;
using System.IO;
namespace Org.BouncyCastle.Asn1
{
/**
* Parser for definite-length tagged objects.
*/
internal class DLTaggedObjectParser
: BerTaggedObjectParser
{
private readonly bool m_constructed;
internal DLTaggedObjectParser(int tagClass, int tagNo, bool constructed, Asn1StreamParser parser)
: base(tagClass, tagNo, parser)
{
m_constructed = constructed;
}
public override bool IsConstructed
{
get { return m_constructed; }
}
public override IAsn1Convertible ParseBaseUniversal(bool declaredExplicit, int baseTagNo)
{
if (declaredExplicit)
{
if (!m_constructed)
throw new IOException("Explicit tags must be constructed (see X.690 8.14.2)");
return m_parser.ParseObject(baseTagNo);
}
return m_constructed
? m_parser.ParseImplicitConstructedDL(baseTagNo)
: m_parser.ParseImplicitPrimitive(baseTagNo);
}
public override IAsn1Convertible ParseExplicitBaseObject()
{
if (!m_constructed)
throw new IOException("Explicit tags must be constructed (see X.690 8.14.2)");
return m_parser.ReadObject();
}
public override Asn1TaggedObjectParser ParseExplicitBaseTagged()
{
if (!m_constructed)
throw new IOException("Explicit tags must be constructed (see X.690 8.14.2)");
return m_parser.ParseTaggedObject();
}
public override Asn1TaggedObjectParser ParseImplicitBaseTagged(int baseTagClass, int baseTagNo)
{
// TODO[asn1] Special handling can be removed once ASN1ApplicationSpecificParser types removed.
if (Asn1Tags.Application == baseTagClass)
{
// This cast is ensuring the current user-expected return type.
return (DLApplicationSpecific)m_parser.LoadTaggedDL(baseTagClass, baseTagNo, m_constructed);
}
return new DLTaggedObjectParser(baseTagClass, baseTagNo, m_constructed, m_parser);
}
public override Asn1Object ToAsn1Object()
{
try
{
return m_parser.LoadTaggedDL(TagClass, TagNo, m_constructed);
}
catch (IOException e)
{
throw new Asn1ParsingException(e.Message);
}
}
}
}
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