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src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Decoder.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Runtime.CompilerServices;
+using static System.Buffers.Text.Base64Helper;
 
 namespace System.Buffers.Text
 {
@@ -29,7 +30,7 @@ public static partial class Base64
         ///   or if the input is incomplete (i.e. not a multiple of 4) and <paramref name="isFinalBlock"/> is <see langword="true"/>.
         /// </returns>
         public static OperationStatus DecodeFromUtf8(ReadOnlySpan<byte> utf8, Span<byte> bytes, out int bytesConsumed, out int bytesWritten, bool isFinalBlock = true) =>
-            Base64Helper.DecodeFrom(Base64Helper.s_base64ByteDecoder, utf8, bytes, out bytesConsumed, out bytesWritten, isFinalBlock, ignoreWhiteSpace: true);
+            DecodeFrom(default(Base64DecoderByte), utf8, bytes, out bytesConsumed, out bytesWritten, isFinalBlock, ignoreWhiteSpace: true);
 
         /// <summary>
         /// Returns the maximum length (in bytes) of the result if you were to decode base 64 encoded text within a byte span of size "length".
@@ -61,6 +62,6 @@ public static int GetMaxDecodedFromUtf8Length(int length)
         /// hence can only be called once with all the data in the buffer.
         /// </returns>
         public static OperationStatus DecodeFromUtf8InPlace(Span<byte> buffer, out int bytesWritten) =>
-            Base64Helper.DecodeFromUtf8InPlace(Base64Helper.s_base64ByteDecoder, buffer, out bytesWritten, ignoreWhiteSpace: true);
+            Base64Helper.DecodeFromUtf8InPlace(default(Base64DecoderByte), buffer, out bytesWritten, ignoreWhiteSpace: true);
     }
 }

src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Encoder.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Runtime.CompilerServices;
+using static System.Buffers.Text.Base64Helper;
 
 namespace System.Buffers.Text
 {
@@ -13,7 +14,6 @@ namespace System.Buffers.Text
     /// </summary>
     public static partial class Base64
     {
-
         /// <summary>
         /// Encode the span of binary data into UTF-8 encoded text represented as base64.
         /// </summary>
@@ -32,7 +32,7 @@ public static partial class Base64
         /// It does not return InvalidData since that is not possible for base64 encoding.
         /// </returns>
         public static OperationStatus EncodeToUtf8(ReadOnlySpan<byte> bytes, Span<byte> utf8, out int bytesConsumed, out int bytesWritten, bool isFinalBlock = true) =>
-            Base64Helper.EncodeTo(Base64Helper.s_base64ByteEncoder, bytes, utf8, out bytesConsumed, out bytesWritten, isFinalBlock);
+            EncodeTo(default(Base64EncoderByte), bytes, utf8, out bytesConsumed, out bytesWritten, isFinalBlock);
 
         /// <summary>
         /// Returns the maximum length (in bytes) of the result if you were to encode binary data within a byte span of size "length".
@@ -43,7 +43,7 @@ public static OperationStatus EncodeToUtf8(ReadOnlySpan<byte> bytes, Span<byte>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static int GetMaxEncodedToUtf8Length(int length)
         {
-            ArgumentOutOfRangeException.ThrowIfGreaterThan<uint>((uint)length, Base64Helper.MaximumEncodeLength);
+            ArgumentOutOfRangeException.ThrowIfGreaterThan<uint>((uint)length, MaximumEncodeLength);
 
             return ((length + 2) / 3) * 4;
         }
@@ -64,6 +64,6 @@ public static int GetMaxEncodedToUtf8Length(int length)
         /// It does not return InvalidData since that is not possible for base 64 encoding.
         /// </returns>
         public static OperationStatus EncodeToUtf8InPlace(Span<byte> buffer, int dataLength, out int bytesWritten) =>
-            Base64Helper.EncodeToUtf8InPlace(Base64Helper.s_base64ByteEncoder, buffer, dataLength, out bytesWritten);
+            Base64Helper.EncodeToUtf8InPlace(default(Base64EncoderByte), buffer, dataLength, out bytesWritten);
     }
 }

src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Helper/Base64DecoderHelper.cs

@@ -4,7 +4,7 @@
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-#if NETCOREAPP
+#if NET
 using System.Runtime.Intrinsics.Arm;
 using System.Runtime.Intrinsics.X86;
 using System.Runtime.Intrinsics;
@@ -14,10 +14,6 @@ namespace System.Buffers.Text
 {
     internal static partial class Base64Helper
     {
-#pragma warning disable CA1805 // Member 's_base64ByteDecoder' is explicitly initialized to its default value
-        internal static Base64DecoderByte s_base64ByteDecoder = default;
-#pragma warning restore CA1805
-
         internal static unsafe OperationStatus DecodeFrom<TBase64Decoder, T>(TBase64Decoder decoder, ReadOnlySpan<T> source, Span<byte> bytes,
             out int bytesConsumed, out int bytesWritten, bool isFinalBlock, bool ignoreWhiteSpace)
             where TBase64Decoder : IBase64Decoder<T>
@@ -50,7 +46,7 @@ internal static unsafe OperationStatus DecodeFrom<TBase64Decoder, T>(TBase64Deco
                 T* srcEnd = srcBytes + (uint)srcLength;
                 T* srcMax = srcBytes + (uint)maxSrcLength;
 
-#if NETCOREAPP
+#if NET
                 if (maxSrcLength >= 24)
                 {
                     T* end = srcMax - 88;
@@ -112,7 +108,7 @@ internal static unsafe OperationStatus DecodeFrom<TBase64Decoder, T>(TBase64Deco
                     // This should never overflow since destLength here is less than int.MaxValue / 4 * 3 (i.e. 1610612733)
                     // Therefore, (destLength / 3) * 4 will always be less than 2147483641
                     Debug.Assert(destLength < (int.MaxValue / 4 * 3));
-#if NETCOREAPP
+#if NET
                     (maxSrcLength, int remainder) = int.DivRem(destLength, 3);
                     maxSrcLength *= 4;
 #else
@@ -643,13 +639,13 @@ private static OperationStatus DecodeWithWhiteSpaceFromUtf8InPlace<TBase64Decode
             return status;
         }
 
-#if NETCOREAPP
+#if NET
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         [CompExactlyDependsOn(typeof(Avx512BW))]
         [CompExactlyDependsOn(typeof(Avx512Vbmi))]
         private static unsafe void Avx512Decode<TBase64Decoder, T>(TBase64Decoder decoder, ref T* srcBytes, ref byte* destBytes, T* srcEnd, int sourceLength, int destLength, T* srcStart, byte* destStart)
-     where TBase64Decoder : IBase64Decoder<T>
-     where T : unmanaged
+            where TBase64Decoder : IBase64Decoder<T>
+            where T : unmanaged
         {
             // Reference for VBMI implementation : https://github.com/WojciechMula/base64simd/tree/master/decode
             // If we have AVX512 support, pick off 64 bytes at a time for as long as we can,
@@ -1243,20 +1239,15 @@ internal static bool IsWhiteSpace(int value)
 
             public uint AdvSimdLutTwo3Uint1 => 0x1B1AFFFF;
 
-            public int GetMaxDecodedLength(int utf8Length) =>
-#if NETCOREAPP
-                Base64.GetMaxDecodedFromUtf8Length(utf8Length);
-#else
-                0;
-#endif
+            public int GetMaxDecodedLength(int utf8Length) => Base64.GetMaxDecodedFromUtf8Length(utf8Length);
 
             public bool IsInvalidLength(int bufferLength) => bufferLength % 4 != 0; // only decode input if it is a multiple of 4
 
             public bool IsValidPadding(uint padChar) => padChar == EncodingPad;
 
             public int SrcLength(bool _, int utf8Length) => utf8Length & ~0x3;  // only decode input up to the closest multiple of 4.
 
-#if NETCOREAPP
+#if NET
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             [CompExactlyDependsOn(typeof(AdvSimd.Arm64))]
             [CompExactlyDependsOn(typeof(Ssse3))]

src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Helper/Base64EncoderHelper.cs

@@ -3,7 +3,7 @@
 
 using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
-#if NETCOREAPP
+#if NET
 using System.Runtime.Intrinsics;
 using System.Runtime.Intrinsics.Arm;
 using System.Runtime.Intrinsics.X86;
@@ -13,10 +13,6 @@ namespace System.Buffers.Text
 {
     internal static partial class Base64Helper
     {
-#pragma warning disable CA1805 // Member 's_base64ByteEncoder' is explicitly initialized to its default value
-        internal static Base64EncoderByte s_base64ByteEncoder = default;
-#pragma warning restore CA1805
-
         internal static unsafe OperationStatus EncodeTo<TBase64Encoder, T>(TBase64Encoder encoder, ReadOnlySpan<byte> source,
             Span<T> destination, out int bytesConsumed, out int bytesWritten, bool isFinalBlock = true)
             where TBase64Encoder : IBase64Encoder<T>
@@ -41,7 +37,7 @@ internal static unsafe OperationStatus EncodeTo<TBase64Encoder, T>(TBase64Encode
                 byte* srcEnd = srcBytes + (uint)srcLength;
                 byte* srcMax = srcBytes + (uint)maxSrcLength;
 
-#if NETCOREAPP
+#if NET
                 if (maxSrcLength >= 16)
                 {
                     byte* end = srcMax - 64;
@@ -132,13 +128,13 @@ internal static unsafe OperationStatus EncodeTo<TBase64Encoder, T>(TBase64Encode
             }
         }
 
-#if NETCOREAPP
+#if NET
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         [CompExactlyDependsOn(typeof(Avx512BW))]
         [CompExactlyDependsOn(typeof(Avx512Vbmi))]
         private static unsafe void Avx512Encode<TBase64Encoder, T>(TBase64Encoder encoder, ref byte* srcBytes, ref T* destBytes, byte* srcEnd, int sourceLength, int destLength, byte* srcStart, T* destStart)
-    where TBase64Encoder : IBase64Encoder<T>
-    where T : unmanaged
+            where TBase64Encoder : IBase64Encoder<T>
+            where T : unmanaged
         {
             // Reference for VBMI implementation : https://github.com/WojciechMula/base64simd/tree/master/encode
             // If we have AVX512 support, pick off 48 bytes at a time for as long as we can.
@@ -664,21 +660,12 @@ private static unsafe uint Encode(byte* threeBytes, ref byte encodingMap)
 
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public int GetMaxSrcLength(int srcLength, int destLength) =>
-#if NETCOREAPP
                 srcLength <= MaximumEncodeLength && destLength >= Base64.GetMaxEncodedToUtf8Length(srcLength) ?
                 srcLength : (destLength >> 2) * 3;
-#else
-                0;
-#endif
 
             public uint GetInPlaceDestinationLength(int encodedLength, int _) => (uint)(encodedLength - 4);
 
-            public int GetMaxEncodedLength(int srcLength) =>
-#if NETCOREAPP
-                Base64.GetMaxEncodedToUtf8Length(srcLength);
-#else
-                0;
-#endif
+            public int GetMaxEncodedLength(int srcLength) => Base64.GetMaxEncodedToUtf8Length(srcLength);
 
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public unsafe void EncodeOneOptionallyPadTwo(byte* oneByte, byte* dest, ref byte encodingMap)
@@ -734,7 +721,7 @@ public unsafe void EncodeTwoOptionallyPadOne(byte* twoBytes, byte* dest, ref byt
                 }
             }
 
-#if NETCOREAPP
+#if NET
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             public unsafe void StoreVector512ToDestination(byte* dest, byte* destStart, int destLength, Vector512<byte> str)
             {

src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Helper/Base64Helper.cs

@@ -3,7 +3,7 @@
 
 using System.Diagnostics;
 using System.Runtime.CompilerServices;
-#if NETCOREAPP
+#if NET
 using System.Runtime.Intrinsics;
 #endif
 
@@ -82,7 +82,7 @@ internal interface IBase64Encoder<T> where T : unmanaged
             unsafe void EncodeThreeAndWrite(byte* threeBytes, T* destination, ref byte encodingMap);
             int IncrementPadTwo { get; }
             int IncrementPadOne { get; }
-#if NETCOREAPP
+#if NET
             unsafe void StoreVector512ToDestination(T* dest, T* destStart, int destLength, Vector512<byte> str);
             unsafe void StoreVector256ToDestination(T* dest, T* destStart, int destLength, Vector256<byte> str);
             unsafe void StoreVector128ToDestination(T* dest, T* destStart, int destLength, Vector128<byte> str);
@@ -109,7 +109,7 @@ internal interface IBase64Decoder<T> where T : unmanaged
             int GetMaxDecodedLength(int sourceLength);
             bool IsInvalidLength(int bufferLength);
             bool IsValidPadding(uint padChar);
-#if NETCOREAPP
+#if NET
             bool TryDecode128Core(
                 Vector128<byte> str,
                 Vector128<byte> hiNibbles,

src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Helper/Base64ValidatorHelper.cs

@@ -7,19 +7,14 @@ namespace System.Buffers.Text
 {
     internal static partial class Base64Helper
     {
-#pragma warning disable CA1805 // Member 's_base64ByteEncoder' is explicitly initialized to its default value
-        internal static Base64ByteValidatable s_base64ByteValidatable = default;
-        internal static Base64CharValidatable s_base64CharValidatable = default;
-#pragma warning restore CA1805
-
         internal static bool IsValid<T, TBase64Validatable>(TBase64Validatable validatable, ReadOnlySpan<T> base64Text, out int decodedLength)
             where TBase64Validatable : IBase64Validatable<T>
         {
             int length = 0, paddingCount = 0;
 
             if (!base64Text.IsEmpty)
             {
-#if NETCOREAPP
+#if NET
                 while (true)
                 {
 
@@ -128,7 +123,7 @@ internal static bool IsValid<T, TBase64Validatable>(TBase64Validatable validatab
 
         internal interface IBase64Validatable<T>
         {
-#if NETCOREAPP
+#if NET
             int IndexOfAnyExcept(ReadOnlySpan<T> span);
 #else
             int DecodeValue(T value);
@@ -140,7 +135,7 @@ internal interface IBase64Validatable<T>
 
         internal readonly struct Base64CharValidatable : IBase64Validatable<char>
         {
-#if NETCOREAPP
+#if NET
             private static readonly SearchValues<char> s_validBase64Chars = SearchValues.Create("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
 
             public int IndexOfAnyExcept(ReadOnlySpan<char> span) => span.IndexOfAnyExcept(s_validBase64Chars);
@@ -153,24 +148,23 @@ public int DecodeValue(char value)
                     return -2;
                 }
 
-                return s_base64ByteDecoder.DecodingMap[value];
+                return default(Base64DecoderByte).DecodingMap[value];
             }
 #endif
             public bool IsWhiteSpace(char value) => Base64Helper.IsWhiteSpace(value);
             public bool IsEncodingPad(char value) => value == EncodingPad;
             public bool ValidateAndDecodeLength(int length, int paddingCount, out int decodedLength) =>
-                s_base64ByteValidatable.ValidateAndDecodeLength(length, paddingCount, out decodedLength);
+                default(Base64ByteValidatable).ValidateAndDecodeLength(length, paddingCount, out decodedLength);
         }
 
         internal readonly struct Base64ByteValidatable : IBase64Validatable<byte>
         {
-#if NETCOREAPP
-            private static readonly SearchValues<byte> s_validBase64Chars = SearchValues.Create(s_base64ByteEncoder.EncodingMap);
+#if NET
+            private static readonly SearchValues<byte> s_validBase64Chars = SearchValues.Create(default(Base64EncoderByte).EncodingMap);
 
             public int IndexOfAnyExcept(ReadOnlySpan<byte> span) => span.IndexOfAnyExcept(s_validBase64Chars);
 #else
-            public int DecodeValue(byte value) =>
-                s_base64ByteDecoder.DecodingMap[value];
+            public int DecodeValue(byte value) => default(Base64DecoderByte).DecodingMap[value];
 #endif
             public bool IsWhiteSpace(byte value) => Base64Helper.IsWhiteSpace(value);
             public bool IsEncodingPad(byte value) => value == EncodingPad;