Add a few missing Stream overrides

src/libraries/System.IO.Compression/ref/System.IO.Compression.cs

@@ -49,6 +49,7 @@ public override void Flush() { }
         public override void SetLength(long value) { }
         public override void Write(byte[] buffer, int offset, int count) { }
         public override void Write(System.ReadOnlySpan<byte> buffer) { }
+        public override void WriteByte(byte value) { }
         public override System.Threading.Tasks.Task WriteAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }
         public override System.Threading.Tasks.ValueTask WriteAsync(System.ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
     }
@@ -83,6 +84,7 @@ public override void Flush() { }
         public override void SetLength(long value) { }
         public override void Write(byte[] buffer, int offset, int count) { }
         public override void Write(System.ReadOnlySpan<byte> buffer) { }
+        public override void WriteByte(byte value) { }
         public override System.Threading.Tasks.Task WriteAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }
         public override System.Threading.Tasks.ValueTask WriteAsync(System.ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
     }

src/libraries/System.IO.Compression/src/System/IO/Compression/DeflateZLib/DeflateStream.cs

@@ -457,6 +457,21 @@ public override void Write(byte[] buffer, int offset, int count)
             WriteCore(new ReadOnlySpan<byte>(buffer, offset, count));
         }
 
+        public override void WriteByte(byte value)
+        {
+            if (GetType() != typeof(DeflateStream))
+            {
+                // DeflateStream is not sealed, and a derived type may have overridden Write(byte[], int, int) prior
+                // to this WriteByte override being introduced.  In that case, this WriteByte override
+                // should use the behavior of the Write(byte[],int,int) overload.
+                base.WriteByte(value);
+            }
+            else
+            {
+                WriteCore(MemoryMarshal.CreateReadOnlySpan(ref value, 1));
+            }
+        }
+
         public override void Write(ReadOnlySpan<byte> buffer)
         {
             if (GetType() != typeof(DeflateStream))

src/libraries/System.IO.Compression/src/System/IO/Compression/GZipStream.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -111,6 +112,22 @@ public override void Write(byte[] buffer, int offset, int count)
             _deflateStream.Write(buffer, offset, count);
         }
 
+        public override void WriteByte(byte value)
+        {
+            if (GetType() != typeof(GZipStream))
+            {
+                // GZipStream is not sealed, and a derived type may have overridden Write(byte[], int, int) prior
+                // to this WriteByte override being introduced.  In that case, this WriteByte override
+                // should use the behavior of the Write(byte[],int,int) overload.
+                base.WriteByte(value);
+            }
+            else
+            {
+                CheckDeflateStream();
+                _deflateStream.WriteCore(MemoryMarshal.CreateReadOnlySpan(ref value, 1));
+            }
+        }
+
         public override void Write(ReadOnlySpan<byte> buffer)
         {
             if (GetType() != typeof(GZipStream))

src/libraries/System.Net.Quic/ref/System.Net.Quic.cs

@@ -102,6 +102,7 @@ public override void Flush() { }
         public override System.Threading.Tasks.Task FlushAsync(System.Threading.CancellationToken cancellationToken) { throw null; }
         public override int Read(byte[] buffer, int offset, int count) { throw null; }
         public override int Read(System.Span<byte> buffer) { throw null; }
+        public override int ReadByte() { throw null; }
         public override System.Threading.Tasks.Task<int> ReadAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }
         public override System.Threading.Tasks.ValueTask<int> ReadAsync(System.Memory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override int ReadTimeout { get { throw null; } set { } }
@@ -112,6 +113,7 @@ public void Shutdown() { }
         public System.Threading.Tasks.ValueTask WaitForWriteCompletionAsync(System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override void Write(byte[] buffer, int offset, int count) { }
         public override void Write(System.ReadOnlySpan<byte> buffer) { }
+        public override void WriteByte(byte value) { }
         public System.Threading.Tasks.ValueTask WriteAsync(System.Buffers.ReadOnlySequence<byte> buffers, bool endStream, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public System.Threading.Tasks.ValueTask WriteAsync(System.Buffers.ReadOnlySequence<byte> buffers, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.Task WriteAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }

src/libraries/System.Net.Quic/src/System/Net/Quic/QuicStream.cs

@@ -4,6 +4,7 @@
 using System.Buffers;
 using System.IO;
 using System.Net.Quic.Implementations;
+using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -46,6 +47,12 @@ public override int Read(byte[] buffer, int offset, int count)
             return Read(buffer.AsSpan(offset, count));
         }
 
+        public override int ReadByte()
+        {
+            byte b = 0;
+            return Read(MemoryMarshal.CreateSpan(ref b, 1)) != 0 ? b : -1;
+        }
+
         public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
             ValidateBufferArguments(buffer, offset, count);
@@ -58,6 +65,11 @@ public override void Write(byte[] buffer, int offset, int count)
             Write(buffer.AsSpan(offset, count));
         }
 
+        public override void WriteByte(byte value)
+        {
+            Write(MemoryMarshal.CreateReadOnlySpan(ref value, 1));
+        }
+
         public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
         {
             ValidateBufferArguments(buffer, offset, count);