[NRBF] More bug fixes

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/ArrayInfo.cs

@@ -13,7 +13,7 @@ namespace System.Formats.Nrbf;
 /// <remarks>
 /// ArrayInfo structures are described in <see href="https://learn.microsoft.com/openspecs/windows_protocols/ms-nrbf/8fac763f-e46d-43a1-b360-80eb83d2c5fb">[MS-NRBF] 2.4.2.1</see>.
 /// </remarks>
-[DebuggerDisplay("Length={Length}, {ArrayType}, rank={Rank}")]
+[DebuggerDisplay("{ArrayType}, rank={Rank}")]
 internal readonly struct ArrayInfo
 {
     internal const int MaxArrayLength = 2147483591; // Array.MaxLength

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/ArraySinglePrimitiveRecord.cs

@@ -41,17 +41,9 @@ internal ArraySinglePrimitiveRecord(ArrayInfo arrayInfo, IReadOnlyList<T> values
     public override T[] GetArray(bool allowNulls = true)
         => (T[])(_arrayNullsNotAllowed ??= (Values is T[] array ? array : Values.ToArray()));
 
-    internal override (AllowedRecordTypes allowed, PrimitiveType primitiveType) GetAllowedRecordType()
-    {
-        Debug.Fail("GetAllowedRecordType should never be called on ArraySinglePrimitiveRecord");
-        throw new InvalidOperationException();
-    }
+    internal override (AllowedRecordTypes allowed, PrimitiveType primitiveType) GetAllowedRecordType() => throw new InvalidOperationException();
 
-    private protected override void AddValue(object value)
-    {
-        Debug.Fail("AddValue should never be called on ArraySinglePrimitiveRecord");
-        throw new InvalidOperationException();
-    }
+    private protected override void AddValue(object value) => throw new InvalidOperationException();
 
     internal static IReadOnlyList<T> DecodePrimitiveTypes(BinaryReader reader, int count)
     {
@@ -94,7 +86,7 @@ internal static IReadOnlyList<T> DecodePrimitiveTypes(BinaryReader reader, int c
 #if NET
         reader.BaseStream.ReadExactly(resultAsBytes);
 #else
-        byte[] bytes = ArrayPool<byte>.Shared.Rent(Math.Min(count * Unsafe.SizeOf<T>(), 256_000));
+        byte[] bytes = ArrayPool<byte>.Shared.Rent((int)Math.Min(requiredBytes, 256_000));
 
         while (!resultAsBytes.IsEmpty)
         {
@@ -159,31 +151,10 @@ internal static IReadOnlyList<T> DecodePrimitiveTypes(BinaryReader reader, int c
     private static List<decimal> DecodeDecimals(BinaryReader reader, int count)
     {
         List<decimal> values = new();
-#if NET
-        Span<byte> buffer = stackalloc byte[256];
-        for (int i = 0; i < count; i++)
-        {
-            int stringLength = reader.Read7BitEncodedInt();
-            if (!(stringLength > 0 && stringLength <= buffer.Length))
-            {
-                ThrowHelper.ThrowInvalidValue(stringLength);
-            }
-
-            reader.BaseStream.ReadExactly(buffer.Slice(0, stringLength));
-
-            if (!decimal.TryParse(buffer.Slice(0, stringLength), NumberStyles.Number, CultureInfo.InvariantCulture, out decimal value))
-            {
-                ThrowHelper.ThrowInvalidFormat();
-            }
-
-            values.Add(value);
-        }
-#else
         for (int i = 0; i < count; i++)
         {
             values.Add(reader.ParseDecimal());
         }
-#endif
         return values;
     }
 
@@ -244,12 +215,14 @@ private static List<T> DecodeFromNonSeekableStream(BinaryReader reader, int coun
             {
                 values.Add((T)(object)Utils.BinaryReaderExtensions.CreateDateTimeFromData(reader.ReadUInt64()));
             }
-            else
+            else if (typeof(T) == typeof(TimeSpan))
             {
-                Debug.Assert(typeof(T) == typeof(TimeSpan));
-
                 values.Add((T)(object)new TimeSpan(reader.ReadInt64()));
             }
+            else
+            {
+                throw new InvalidOperationException();
+            }
         }
 
         return values;

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/ArraySingleStringRecord.cs

@@ -21,7 +21,7 @@ internal sealed class ArraySingleStringRecord : SZArrayRecord<string?>
     public override SerializationRecordType RecordType => SerializationRecordType.ArraySingleString;
 
     /// <inheritdoc />
-    public override TypeName TypeName => TypeNameHelpers.GetPrimitiveSZArrayTypeName(PrimitiveType.String);
+    public override TypeName TypeName => TypeNameHelpers.GetPrimitiveSZArrayTypeName(TypeNameHelpers.StringPrimitiveType);
 
     private List<SerializationRecord> Records { get; }
 

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/BinaryArrayRecord.cs

@@ -138,7 +138,7 @@ internal static ArrayRecord Decode(BinaryReader reader, RecordMap recordMap, Pay
             lengths[i] = ArrayInfo.ParseValidArrayLength(reader);
             totalElementCount *= lengths[i];
 
-            if (totalElementCount > uint.MaxValue)
+            if (totalElementCount > ArrayInfo.MaxArrayLength)
             {
                 ThrowHelper.ThrowInvalidValue(lengths[i]); // max array size exceeded
             }

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/BinaryLibraryRecord.cs

@@ -30,14 +30,7 @@ private BinaryLibraryRecord(SerializationRecordId libraryId, AssemblyNameInfo li
 
     public override SerializationRecordType RecordType => SerializationRecordType.BinaryLibrary;
 
-    public override TypeName TypeName
-    {
-        get
-        {
-            Debug.Fail("TypeName should never be called on BinaryLibraryRecord");
-            return TypeName.Parse(nameof(BinaryLibraryRecord).AsSpan());
-        }
-    }
+    public override TypeName TypeName => TypeName.Parse(nameof(BinaryLibraryRecord).AsSpan());
 
     internal string? RawLibraryName { get; }
 

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/MemberTypeInfo.cs

@@ -53,10 +53,14 @@ internal static MemberTypeInfo Decode(BinaryReader reader, int count, PayloadOpt
                 case BinaryType.Class:
                     info[i] = (type, ClassTypeInfo.Decode(reader, options, recordMap));
                     break;
-                default:
-                    // Other types have no additional data.
-                    Debug.Assert(type is BinaryType.String or BinaryType.ObjectArray or BinaryType.StringArray or BinaryType.Object);
+                case BinaryType.String:
+                case BinaryType.StringArray:
+                case BinaryType.Object:
+                case BinaryType.ObjectArray:
+                    // These types have no additional data.
                     break;
+                default:
+                    throw new InvalidOperationException();
             }
         }
 
@@ -97,7 +101,8 @@ internal static MemberTypeInfo Decode(BinaryReader reader, int count, PayloadOpt
             BinaryType.PrimitiveArray => (PrimitiveArray, default),
             BinaryType.Class => (NonSystemClass, default),
             BinaryType.SystemClass => (SystemClass, default),
-            _ => (ObjectArray, default)
+            BinaryType.ObjectArray => (ObjectArray, default),
+            _ => throw new InvalidOperationException()
         };
     }
 
@@ -144,15 +149,15 @@ internal TypeName GetArrayTypeName(ArrayInfo arrayInfo)
 
         TypeName elementTypeName = binaryType switch
         {
-            BinaryType.String => TypeNameHelpers.GetPrimitiveTypeName(PrimitiveType.String),
-            BinaryType.StringArray => TypeNameHelpers.GetPrimitiveSZArrayTypeName(PrimitiveType.String),
+            BinaryType.String => TypeNameHelpers.GetPrimitiveTypeName(TypeNameHelpers.StringPrimitiveType),
+            BinaryType.StringArray => TypeNameHelpers.GetPrimitiveSZArrayTypeName(TypeNameHelpers.StringPrimitiveType),
             BinaryType.Primitive => TypeNameHelpers.GetPrimitiveTypeName((PrimitiveType)additionalInfo!),
             BinaryType.PrimitiveArray => TypeNameHelpers.GetPrimitiveSZArrayTypeName((PrimitiveType)additionalInfo!),
             BinaryType.Object => TypeNameHelpers.GetPrimitiveTypeName(TypeNameHelpers.ObjectPrimitiveType),
             BinaryType.ObjectArray => TypeNameHelpers.GetPrimitiveSZArrayTypeName(TypeNameHelpers.ObjectPrimitiveType),
             BinaryType.SystemClass => (TypeName)additionalInfo!,
             BinaryType.Class => ((ClassTypeInfo)additionalInfo!).TypeName,
-            _ => throw new ArgumentOutOfRangeException(paramName: nameof(binaryType), actualValue: binaryType, message: null)
+            _ => throw new InvalidOperationException()
         };
 
         // In general, arrayRank == 1 may have two different meanings:

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/MessageEndRecord.cs

@@ -24,12 +24,5 @@ private MessageEndRecord()
 
     public override SerializationRecordId Id => SerializationRecordId.NoId;
 
-    public override TypeName TypeName
-    {
-        get
-        {
-            Debug.Fail("TypeName should never be called on MessageEndRecord");
-            return TypeName.Parse(nameof(MessageEndRecord).AsSpan());
-        }
-    }
+    public override TypeName TypeName => TypeName.Parse(nameof(MessageEndRecord).AsSpan());
 }

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/NrbfDecoder.cs

@@ -69,28 +69,22 @@ public static bool StartsWithPayloadHeader(Stream stream)
             return false;
         }
 
-        try
+        byte[] buffer = new byte[SerializedStreamHeaderRecord.Size];
+        int offset = 0;
+        while (offset < buffer.Length)
         {
-#if NET
-            Span<byte> buffer = stackalloc byte[SerializedStreamHeaderRecord.Size];
-            stream.ReadExactly(buffer);
-#else
-            byte[] buffer = new byte[SerializedStreamHeaderRecord.Size];
-            int offset = 0;
-            while (offset < buffer.Length)
+            int read = stream.Read(buffer, offset, buffer.Length - offset);
+            if (read == 0)
             {
-                int read = stream.Read(buffer, offset, buffer.Length - offset);
-                if (read == 0)
-                    throw new EndOfStreamException();
-                offset += read;
+                stream.Position = beginning;
+                return false;
             }
-#endif
-            return StartsWithPayloadHeader(buffer);
-        }
-        finally
-        {
-            stream.Position = beginning;
+            offset += read;
         }
+
+        bool result = StartsWithPayloadHeader(buffer);
+        stream.Position = beginning;
+        return result;
     }
 
     /// <summary>
@@ -241,7 +235,8 @@ private static SerializationRecord DecodeNext(BinaryReader reader, RecordMap rec
             SerializationRecordType.ObjectNullMultiple => ObjectNullMultipleRecord.Decode(reader),
             SerializationRecordType.ObjectNullMultiple256 => ObjectNullMultiple256Record.Decode(reader),
             SerializationRecordType.SerializedStreamHeader => SerializedStreamHeaderRecord.Decode(reader),
-            _ => SystemClassWithMembersAndTypesRecord.Decode(reader, recordMap, options),
+            SerializationRecordType.SystemClassWithMembersAndTypes => SystemClassWithMembersAndTypesRecord.Decode(reader, recordMap, options),
+            _ => throw new InvalidOperationException()
         };
 
         recordMap.Add(record);
@@ -269,8 +264,8 @@ private static SerializationRecord DecodeMemberPrimitiveTypedRecord(BinaryReader
             PrimitiveType.Double => new MemberPrimitiveTypedRecord<double>(reader.ReadDouble()),
             PrimitiveType.Decimal => new MemberPrimitiveTypedRecord<decimal>(reader.ParseDecimal()),
             PrimitiveType.DateTime => new MemberPrimitiveTypedRecord<DateTime>(Utils.BinaryReaderExtensions.CreateDateTimeFromData(reader.ReadUInt64())),
-            // String is handled with a record, never on it's own
-            _ => new MemberPrimitiveTypedRecord<TimeSpan>(new TimeSpan(reader.ReadInt64())),
+            PrimitiveType.TimeSpan => new MemberPrimitiveTypedRecord<TimeSpan>(new TimeSpan(reader.ReadInt64())),
+            _ => throw new InvalidOperationException()
         };
     }
 
@@ -295,7 +290,8 @@ private static SerializationRecord DecodeArraySinglePrimitiveRecord(BinaryReader
             PrimitiveType.Double => Decode<double>(info, reader),
             PrimitiveType.Decimal => Decode<decimal>(info, reader),
             PrimitiveType.DateTime => Decode<DateTime>(info, reader),
-            _ => Decode<TimeSpan>(info, reader),
+            PrimitiveType.TimeSpan => Decode<TimeSpan>(info, reader),
+            _ => throw new InvalidOperationException()
         };
 
         static SerializationRecord Decode<T>(ArrayInfo info, BinaryReader reader) where T : unmanaged

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/NullsRecord.cs

@@ -12,12 +12,5 @@ internal abstract class NullsRecord : SerializationRecord
 
     public override SerializationRecordId Id => SerializationRecordId.NoId;
 
-    public override TypeName TypeName
-    {
-        get
-        {
-            Debug.Fail($"TypeName should never be called on {GetType().Name}");
-            return TypeName.Parse(GetType().Name.AsSpan());
-        }
-    }
+    public override TypeName TypeName => TypeName.Parse(GetType().Name.AsSpan());
 }

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/PrimitiveType.cs

@@ -11,10 +11,6 @@ namespace System.Formats.Nrbf;
 /// </remarks>
 internal enum PrimitiveType : byte
 {
-    /// <summary>
-    /// Used internally to express no value
-    /// </summary>
-    None = 0,
     Boolean = 1,
     Byte = 2,
     Char = 3,
@@ -30,7 +26,19 @@ internal enum PrimitiveType : byte
     DateTime = 13,
     UInt16 = 14,
     UInt32 = 15,
-    UInt64 = 16,
-    Null = 17,
-    String = 18
+    UInt64 = 16
+    // This internal enum no longer contains Null and String as they were always illegal:
+    // - In case of BinaryArray (NRBF 2.4.3.1):
+    // "If the BinaryTypeEnum value is Primitive, the PrimitiveTypeEnumeration
+    // value in AdditionalTypeInfo MUST NOT be Null (17) or String (18)."
+    // - In case of MemberPrimitiveTyped (NRBF 2.5.1):
+    // "PrimitiveTypeEnum (1 byte): A PrimitiveTypeEnumeration
+    // value that specifies the Primitive Type of data that is being transmitted.
+    // This field MUST NOT contain a value of 17 (Null) or 18 (String)."
+    // - In case of ArraySinglePrimitive (NRBF 2.4.3.3):
+    // "A PrimitiveTypeEnumeration value that identifies the Primitive Type
+    // of the items of the Array. The value MUST NOT be 17 (Null) or 18 (String)."
+    // - In case of MemberTypeInfo (NRBF 2.3.1.2):
+    // "When the BinaryTypeEnum value is Primitive, the PrimitiveTypeEnumeration
+    // value in AdditionalInfo MUST NOT be Null (17) or String (18)."
 }

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/RecordMap.cs

@@ -56,7 +56,7 @@ internal void Add(SerializationRecord record)
                     return;
                 }
 #endif
-                throw new SerializationException(SR.Format(SR.Serialization_DuplicateSerializationRecordId, record.Id));
+                throw new SerializationException(SR.Format(SR.Serialization_DuplicateSerializationRecordId, record.Id._id));
             }
         }
     }

src/libraries/System.Formats.Nrbf/src/System/Formats/Nrbf/RectangularArrayRecord.cs

@@ -14,7 +14,7 @@ namespace System.Formats.Nrbf;
 internal sealed class RectangularArrayRecord : ArrayRecord
 {
     private readonly int[] _lengths;
-    private readonly ICollection<object> _values;
+    private readonly List<object> _values;
     private TypeName? _typeName;
 
     private RectangularArrayRecord(Type elementType, ArrayInfo arrayInfo,
@@ -24,18 +24,8 @@ private RectangularArrayRecord(Type elementType, ArrayInfo arrayInfo,
         MemberTypeInfo = memberTypeInfo;
         _lengths = lengths;
 
-        // A List<T> can hold as many objects as an array, so for multi-dimensional arrays
-        // with more elements than Array.MaxLength we use LinkedList.
-        // Testing that many elements takes a LOT of time, so to ensure that both code paths are tested,
-        // we always use LinkedList code path for Debug builds.
-#if DEBUG
-        _values = new LinkedList<object>();
-#else
-        _values = arrayInfo.TotalElementsCount <= ArrayInfo.MaxArrayLength
-            ? new List<object>(canPreAllocate ? arrayInfo.GetSZArrayLength() : Math.Min(4, arrayInfo.GetSZArrayLength()))
-            : new LinkedList<object>();
-#endif
-
+        // ArrayInfo.GetSZArrayLength ensures to return a value <= Array.MaxLength
+        _values = new List<object>(canPreAllocate ? arrayInfo.GetSZArrayLength() : Math.Min(4, arrayInfo.GetSZArrayLength()));
     }
 
     public override SerializationRecordType RecordType => SerializationRecordType.BinaryArray;
@@ -108,6 +98,7 @@ private protected override Array Deserialize(Type arrayType, bool allowNulls)
             else if (ElementType == typeof(TimeSpan)) CopyTo<TimeSpan>(_values, result);
             else if (ElementType == typeof(DateTime)) CopyTo<DateTime>(_values, result);
             else if (ElementType == typeof(decimal)) CopyTo<decimal>(_values, result);
+            else throw new InvalidOperationException();
         }
         else
         {
@@ -116,7 +107,7 @@ private protected override Array Deserialize(Type arrayType, bool allowNulls)
 
         return result;
 
-        static void CopyTo<T>(ICollection<object> list, Array array)
+        static void CopyTo<T>(List<object> list, Array array)
         {
             ref byte arrayDataRef = ref MemoryMarshal.GetArrayDataReference(array);
             ref T firstElementRef = ref Unsafe.As<byte, T>(ref arrayDataRef);
@@ -176,7 +167,10 @@ internal static RectangularArrayRecord Create(BinaryReader reader, ArrayInfo arr
                 PrimitiveType.Int64 => sizeof(long),
                 PrimitiveType.UInt64 => sizeof(ulong),
                 PrimitiveType.Double => sizeof(double),
-                _ => -1
+                PrimitiveType.TimeSpan => sizeof(ulong),
+                PrimitiveType.DateTime => sizeof(ulong),
+                PrimitiveType.Decimal => -1, // represented as variable-length string
+                _ => throw new InvalidOperationException()
             };
 
             if (sizeOfSingleValue > 0)
@@ -215,7 +209,8 @@ private static Type MapPrimitive(PrimitiveType primitiveType)
             PrimitiveType.DateTime => typeof(DateTime),
             PrimitiveType.UInt16 => typeof(ushort),
             PrimitiveType.UInt32 => typeof(uint),
-            _ => typeof(ulong)
+            PrimitiveType.UInt64 => typeof(ulong),
+            _ => throw new InvalidOperationException()
         };
 
     private static Type MapPrimitiveArray(PrimitiveType primitiveType)
@@ -235,7 +230,8 @@ private static Type MapPrimitiveArray(PrimitiveType primitiveType)
             PrimitiveType.DateTime => typeof(DateTime[]),
             PrimitiveType.UInt16 => typeof(ushort[]),
             PrimitiveType.UInt32 => typeof(uint[]),
-            _ => typeof(ulong[]),
+            PrimitiveType.UInt64 => typeof(ulong[]),
+            _ => throw new InvalidOperationException()
         };
 
     private static object? GetActualValue(object value)