adjusted null syntax

Author: Crypt32

Asn1Parser/Asn1InvalidTagException.cs

@@ -39,6 +39,7 @@ public Asn1InvalidTagException(String message, Exception innerException) : base(
     /// <param name="info">The object that holds the serialized object data.</param>
     /// <param name="context">The contextual information about the source or destination.</param>
     /// <remarks>This constructor is called during deserialization to reconstitute the exception object transmitted over a stream.</remarks>
+    [Obsolete("This overload is obsolete by SYSLIB0051.", true)]
     public Asn1InvalidTagException(SerializationInfo info, StreamingContext context) : base(info, context) { }
     /// <summary>
     /// Gets the offset at which invalid ASN tag appear.

Asn1Parser/Asn1Reader.cs

@@ -537,7 +537,7 @@ public void MoveNextSiblingAndExpectTags(params Asn1Type[] expectedTags) {
     /// method calls are not necessary.
     /// </remarks>
     public Boolean Seek(Int32 newPosition) {
-        if (!_offsetMap.TryGetValue(newPosition, out AsnInternalMap value)) {
+        if (!_offsetMap.TryGetValue(newPosition, out AsnInternalMap? value)) {
             return false;
         }
         currentPosition = value;

Asn1Parser/Asn1Utils.cs

@@ -187,10 +187,11 @@ public static Asn1Reader EncodeAsReader(ReadOnlySpan<Byte> rawData, Byte enclosi
 
     #region internal
     public static String GetViewValue(Asn1Reader asn) {
-        if (asn.PayloadLength == 0 && asn.Tag != (Byte)Asn1Type.NULL) { return "NULL"; }
+        if (asn.PayloadLength == 0 && asn.Tag != (Byte)Asn1Type.NULL) {
+            return "NULL";
+        }
 
         return asn.Tag switch {
-
             (Byte)Asn1Type.BOOLEAN           => new Asn1Boolean(asn).Value.ToString(),
             (Byte)Asn1Type.INTEGER           => new Asn1Integer(asn).Value.ToString(),
             (Byte)Asn1Type.BIT_STRING        => decodeBitString(asn),

Asn1Parser/AsnFormatter.cs

@@ -105,7 +105,7 @@ public static String BinaryToString(Asn1Reader asn, EncodingType encoding = Enco
     /// </para>
     /// </remarks>
     public static Byte[] StringToBinary(String input, EncodingType encoding = EncodingType.Base64) {
-        Byte[] rawData;
+        Byte[]? rawData;
         if (PemHeader.ContainsEncoding(encoding)) {
             var pemHeader = PemHeader.GetHeader(encoding);
             rawData = StringToBinaryFormatter.FromBase64Header(input, pemHeader.GetHeader(), pemHeader.GetFooter());

Asn1Parser/Universal/Asn1DateTime.cs

@@ -54,7 +54,7 @@ void m_encode(Asn1Type type, DateTime time, TimeZoneInfo? zone, Boolean preciseT
     void m_decode(ReadOnlyMemory<Byte> rawData) {
         var asn = new Asn1Reader(rawData);
         Initialize(asn);
-        Value = DateTimeUtils.Decode(asn, out TimeZoneInfo zoneInfo);
+        Value = DateTimeUtils.Decode(asn, out TimeZoneInfo? zoneInfo);
         ZoneInfo = zoneInfo;
     }
 

Asn1Parser/Universal/Asn1ObjectIdentifier.cs

@@ -170,7 +170,7 @@ static Boolean validateOidString(String oid, out List<BigInteger> tokens) {
     /// <inheritdoc/>
     public override String GetDisplayValue() {
         return String.IsNullOrEmpty(Value.FriendlyName)
-            ? Value.Value
+            ? Value.Value!
             : $"{Value.FriendlyName} ({Value.Value})";
     }
 }

Asn1Parser/Universal/Asn1String.cs

@@ -88,7 +88,7 @@ public static Asn1String DecodeAnyString(ReadOnlyMemory<Byte> rawData, IEnumerab
             throw new ArgumentException("Raw data must have at least tag (1 byte) and length components (1 byte) in TLV structure.");
         }
 
-        IEnumerable<Asn1Type> asn1Types = allowedStringTypes?.ToList();
+        IEnumerable<Asn1Type>? asn1Types = allowedStringTypes?.ToList();
         if (asn1Types is not null && !asn1Types.Contains((Asn1Type)rawData.Span[0])) {
             throw new ArgumentException("Input string is not permitted by restriction.");
         }