From 39a846768e82cd1439bcb165665593c9baae5ffb Mon Sep 17 00:00:00 2001
From: Peter Dettman <peter.dettman@bouncycastle.org>
Date: Mon, 8 Nov 2021 16:44:49 +0700
Subject: More tagged object work from bc-java

---
 crypto/src/asn1/Asn1Utilities.cs | 69 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

(limited to 'crypto/src/asn1/Asn1Utilities.cs')

diff --git a/crypto/src/asn1/Asn1Utilities.cs b/crypto/src/asn1/Asn1Utilities.cs
index dca2253ec..fe6db2df7 100644
--- a/crypto/src/asn1/Asn1Utilities.cs
+++ b/crypto/src/asn1/Asn1Utilities.cs
@@ -23,5 +23,74 @@ namespace Org.BouncyCastle.Asn1
                 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);
+        }
     }
 }
-- 
cgit 1.4.1