HTTP/3: Remove ASP.NET Core specific code from QPackEncoder (#54378)

src/libraries/Common/src/System/Net/Http/aspnetcore/Http3/QPack/QPackEncoder.cs

@@ -9,10 +9,8 @@
 
 namespace System.Net.Http.QPack
 {
- internal sealed class QPackEncoder
+ internal static class QPackEncoder
  {
- private IEnumerator<KeyValuePair<string, string>>? _enumerator;
-
  // https://tools.ietf.org/html/draft-ietf-quic-qpack-11#section-4.5.2
  // 0 1 2 3 4 5 6 7
  // +---+---+---+---+---+---+---+---+
@@ -403,93 +401,5 @@ private static bool EncodeHeaderBlockPrefix(Span<byte> destination, out int byte
 
  return true;
  }
-
- public bool BeginEncode(IEnumerable<KeyValuePair<string, string>> headers, Span<byte> buffer, out int length)
- {
- _enumerator = headers.GetEnumerator();
-
- bool hasValue = _enumerator.MoveNext();
- Debug.Assert(hasValue == true);
-
- buffer[0] = 0;
- buffer[1] = 0;
-
- bool doneEncode = Encode(buffer.Slice(2), out length);
-
- // Add two for the first two bytes.
- length += 2;
- return doneEncode;
- }
-
- public bool BeginEncode(int statusCode, IEnumerable<KeyValuePair<string, string>> headers, Span<byte> buffer, out int length)
- {
- _enumerator = headers.GetEnumerator();
-
- bool hasValue = _enumerator.MoveNext();
- Debug.Assert(hasValue == true);
-
- // https://quicwg.org/base-drafts/draft-ietf-quic-qpack.html#header-prefix
- buffer[0] = 0;
- buffer[1] = 0;
-
- int statusCodeLength = EncodeStatusCode(statusCode, buffer.Slice(2));
- bool done = Encode(buffer.Slice(statusCodeLength + 2), throwIfNoneEncoded: false, out int headersLength);
- length = statusCodeLength + headersLength + 2;
-
- return done;
- }
-
- public bool Encode(Span<byte> buffer, out int length)
- {
- return Encode(buffer, throwIfNoneEncoded: true, out length);
- }
-
- private bool Encode(Span<byte> buffer, bool throwIfNoneEncoded, out int length)
- {
- length = 0;
-
- do
- {
- if (!EncodeLiteralHeaderFieldWithoutNameReference(_enumerator!.Current.Key, _enumerator.Current.Value, buffer.Slice(length), out int headerLength))
- {
- if (length == 0 && throwIfNoneEncoded)
- {
- throw new QPackEncodingException("TODO sync with corefx" /* CoreStrings.HPackErrorNotEnoughBuffer */);
- }
- return false;
- }
-
- length += headerLength;
- } while (_enumerator.MoveNext());
-
- return true;
- }
-
- private int EncodeStatusCode(int statusCode, Span<byte> buffer)
- {
- switch (statusCode)
- {
- case 200:
- case 204:
- case 206:
- case 304:
- case 400:
- case 404:
- case 500:
- EncodeStaticIndexedHeaderField(H3StaticTable.StatusIndex[statusCode], buffer, out var bytesWritten);
- return bytesWritten;
- default:
- // https://tools.ietf.org/html/draft-ietf-quic-qpack-21#section-4.5.4
- // Index is 63 - :status
- buffer[0] = 0b01011111;
- buffer[1] = 0b00110000;
-
- ReadOnlySpan<byte> statusBytes = StatusCodes.ToStatusBytes(statusCode);
- buffer[2] = (byte)statusBytes.Length;
- statusBytes.CopyTo(buffer.Slice(3));
-
- return 3 + statusBytes.Length;
- }
- }
  }
 }