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using System;
namespace Org.BouncyCastle.Asn1
{
public abstract class Asn1Utilities
{
public static string GetTagText(Asn1TaggedObject taggedObject)
{
return GetTagText(taggedObject.TagClass, taggedObject.TagNo);
}
public static string GetTagText(int tagClass, int tagNo)
{
switch (tagClass)
{
case Asn1Tags.Application:
return "[APPLICATION " + tagNo + "]";
case Asn1Tags.ContextSpecific:
return "[CONTEXT " + tagNo + "]";
case Asn1Tags.Private:
return "[PRIVATE " + tagNo + "]";
default:
return "[UNIVERSAL " + tagNo + "]";
}
}
/*
* Wrappers for Asn1TaggedObject.GetExplicitBaseObject
*/
public static Asn1Encodable GetExplicitBaseObject(Asn1TaggedObject taggedObject, int tagClass, int tagNo)
{
if (!taggedObject.HasTag(tagClass, tagNo))
{
string expected = GetTagText(tagClass, tagNo);
string found = GetTagText(taggedObject);
throw new InvalidOperationException("Expected " + expected + " tag but found " + found);
}
return taggedObject.GetExplicitBaseObject();
}
public static Asn1Encodable GetExplicitContextBaseObject(Asn1TaggedObject taggedObject, int tagNo)
{
return GetExplicitBaseObject(taggedObject, Asn1Tags.ContextSpecific, tagNo);
}
public static Asn1Encodable TryGetExplicitBaseObject(Asn1TaggedObject taggedObject, int tagClass, int tagNo)
{
if (!taggedObject.HasTag(tagClass, tagNo))
return null;
return taggedObject.GetExplicitBaseObject();
}
public static Asn1Encodable TryGetExplicitContextBaseObject(Asn1TaggedObject taggedObject, int tagNo)
{
return TryGetExplicitBaseObject(taggedObject, Asn1Tags.ContextSpecific, tagNo);
}
/*
* Wrappers for Asn1TaggedObject.GetExplicitBaseTagged
*/
public static Asn1TaggedObject GetExplicitBaseTagged(Asn1TaggedObject taggedObject, int tagClass, int tagNo)
{
if (!taggedObject.HasTag(tagClass, tagNo))
{
string expected = GetTagText(tagClass, tagNo);
string found = GetTagText(taggedObject);
throw new InvalidOperationException("Expected " + expected + " tag but found " + found);
}
return taggedObject.GetExplicitBaseTagged();
}
public static Asn1TaggedObject GetExplicitContextBaseTagged(Asn1TaggedObject taggedObject, int tagNo)
{
return GetExplicitBaseTagged(taggedObject, Asn1Tags.ContextSpecific, tagNo);
}
public static Asn1TaggedObject TryGetExplicitBaseTagged(Asn1TaggedObject taggedObject, int tagClass, int tagNo)
{
if (!taggedObject.HasTag(tagClass, tagNo))
return null;
return taggedObject.GetExplicitBaseTagged();
}
public static Asn1TaggedObject TryGetExplicitContextBaseTagged(Asn1TaggedObject taggedObject, int tagNo)
{
return TryGetExplicitBaseTagged(taggedObject, Asn1Tags.ContextSpecific, tagNo);
}
}
}
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