Sync shared code from runtime

src/Shared/runtime/Http3/QPack/H3StaticTable.Http3.cs

@@ -48,7 +48,7 @@ public static bool TryGetStatusIndex(int status, out int index)
         // TODO: just use Dictionary directly to avoid interface dispatch.
         public static IReadOnlyDictionary<HttpMethod, int> MethodIndex => s_methodIndex;
 
-        public static ref HeaderField Get(int index) => ref s_staticTable[index];
+        public static HeaderField GetHeaderFieldAt(int index) => s_staticTable[index];
 
         private static readonly HeaderField[] s_staticTable = new HeaderField[]
         {

src/Shared/runtime/Http3/QPack/QPackDecoder.cs

@@ -180,36 +180,18 @@ public void Decode(in ReadOnlySequence<byte> headerBlock, bool endHeaders, IHttp
         {
             foreach (ReadOnlyMemory<byte> segment in headerBlock)
             {
-                DecodeCore(segment.Span, handler);
+                Decode(segment.Span, endHeaders: false, handler);
             }
-            CheckIncompleteHeaderBlock(endHeaders);
         }
 
         public void Decode(ReadOnlySpan<byte> headerBlock, bool endHeaders, IHttpHeadersHandler handler)
-        {
-            DecodeCore(headerBlock, handler);
-            CheckIncompleteHeaderBlock(endHeaders);
-        }
-
-        private void DecodeCore(ReadOnlySpan<byte> headerBlock, IHttpHeadersHandler handler)
         {
             foreach (byte b in headerBlock)
             {
                 OnByte(b, handler);
             }
         }
 
-        private void CheckIncompleteHeaderBlock(bool endHeaders)
-        {
-            if (endHeaders)
-            {
-                if (_state != State.CompressedHeaders)
-                {
-                    throw new QPackDecodingException(SR.net_http_hpack_incomplete_header_block);
-                }
-            }
-        }
-
         private void OnByte(byte b, IHttpHeadersHandler handler)
         {
             int intResult;