// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <fuzzer/FuzzedDataProvider.h>

#include <cstddef>
#include <cstdint>

#include "quic/core/qpack/qpack_decoder_stream_sender.h"
#include "quic/core/quic_types.h"
#include "quic/test_tools/qpack/qpack_test_utils.h"

namespace quic {
namespace test {

// This fuzzer exercises QpackDecoderStreamSender.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  NoopQpackStreamSenderDelegate delegate;
  QpackDecoderStreamSender sender;
  sender.set_qpack_stream_sender_delegate(&delegate);

  FuzzedDataProvider provider(data, size);

  while (provider.remaining_bytes() != 0) {
    switch (provider.ConsumeIntegral<uint8_t>() % 4) {
      case 0: {
        uint64_t increment = provider.ConsumeIntegral<uint64_t>();
        sender.SendInsertCountIncrement(increment);
        break;
      }
      case 1: {
        QuicStreamId stream_id = provider.ConsumeIntegral<QuicStreamId>();
        sender.SendHeaderAcknowledgement(stream_id);
        break;
      }
      case 2: {
        QuicStreamId stream_id = provider.ConsumeIntegral<QuicStreamId>();
        sender.SendStreamCancellation(stream_id);
        break;
      }
      case 3: {
        sender.Flush();
        break;
      }
    }
  }

  sender.Flush();
  return 0;
}

}  // namespace test
}  // namespace quic