// Copyright (c) 2012 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 "net/third_party/quiche/src/quic/core/quic_packet_creator.h"

#include <cstdint>
#include <memory>
#include <ostream>
#include <string>

#include "net/third_party/quiche/src/quic/core/crypto/null_decrypter.h"
#include "net/third_party/quiche/src/quic/core/crypto/null_encrypter.h"
#include "net/third_party/quiche/src/quic/core/crypto/quic_decrypter.h"
#include "net/third_party/quiche/src/quic/core/crypto/quic_encrypter.h"
#include "net/third_party/quiche/src/quic/core/quic_data_writer.h"
#include "net/third_party/quiche/src/quic/core/quic_pending_retransmission.h"
#include "net/third_party/quiche/src/quic/core/quic_simple_buffer_allocator.h"
#include "net/third_party/quiche/src/quic/core/quic_types.h"
#include "net/third_party/quiche/src/quic/core/quic_utils.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_arraysize.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_expect_bug.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_socket_address.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_string_piece.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_test.h"
#include "net/third_party/quiche/src/quic/test_tools/quic_framer_peer.h"
#include "net/third_party/quiche/src/quic/test_tools/quic_packet_creator_peer.h"
#include "net/third_party/quiche/src/quic/test_tools/quic_test_utils.h"
#include "net/third_party/quiche/src/quic/test_tools/simple_data_producer.h"

using testing::_;
using testing::DoAll;
using testing::InSequence;
using testing::Invoke;
using testing::Return;
using testing::SaveArg;
using testing::StrictMock;

namespace quic {
namespace test {
namespace {

const QuicPacketNumber kPacketNumber = QuicPacketNumber(UINT64_C(0x12345678));
// Use fields in which each byte is distinct to ensure that every byte is
// framed correctly. The values are otherwise arbitrary.
const QuicConnectionId kTestConnectionId =
    TestConnectionId(UINT64_C(0xFEDCBA9876543210));

// Run tests with combinations of {ParsedQuicVersion,
// ToggleVersionSerialization}.
struct TestParams {
  TestParams(ParsedQuicVersion version, bool version_serialization)
      : version(version), version_serialization(version_serialization) {}

  ParsedQuicVersion version;
  bool version_serialization;
};

// Used by ::testing::PrintToStringParamName().
std::string PrintToString(const TestParams& p) {
  return QuicStrCat(ParsedQuicVersionToString(p.version), "_",
                    (p.version_serialization ? "Include" : "No"), "Version");
}

// Constructs various test permutations.
std::vector<TestParams> GetTestParams() {
  std::vector<TestParams> params;
  ParsedQuicVersionVector all_supported_versions = AllSupportedVersions();
  for (size_t i = 0; i < all_supported_versions.size(); ++i) {
    params.push_back(TestParams(all_supported_versions[i], true));
    params.push_back(TestParams(all_supported_versions[i], false));
  }
  return params;
}

class MockDebugDelegate : public QuicPacketCreator::DebugDelegate {
 public:
  ~MockDebugDelegate() override = default;

  MOCK_METHOD1(OnFrameAddedToPacket, void(const QuicFrame& frame));
};

class TestPacketCreator : public QuicPacketCreator {
 public:
  TestPacketCreator(QuicConnectionId connection_id,
                    QuicFramer* framer,
                    DelegateInterface* delegate,
                    SimpleDataProducer* producer)
      : QuicPacketCreator(connection_id, framer, delegate),
        producer_(producer),
        version_(framer->transport_version()) {}

  bool ConsumeDataToFillCurrentPacket(QuicStreamId id,
                                      const struct iovec* iov,
                                      int iov_count,
                                      size_t total_length,
                                      size_t iov_offset,
                                      QuicStreamOffset offset,
                                      bool fin,
                                      bool needs_full_padding,
                                      TransmissionType transmission_type,
                                      QuicFrame* frame) {
    // Save data before data is consumed.
    QuicByteCount data_length = total_length - iov_offset;
    if (data_length > 0) {
      producer_->SaveStreamData(id, iov, iov_count, iov_offset, data_length);
    }
    return QuicPacketCreator::ConsumeDataToFillCurrentPacket(
        id, data_length - iov_offset, offset, fin, needs_full_padding,
        transmission_type, frame);
  }

  void StopSendingVersion() {
    if (VersionHasIetfInvariantHeader(version_)) {
      set_encryption_level(ENCRYPTION_FORWARD_SECURE);
      return;
    }
    QuicPacketCreator::StopSendingVersion();
  }

  SimpleDataProducer* producer_;
  QuicTransportVersion version_;
};

class QuicPacketCreatorTest : public QuicTestWithParam<TestParams> {
 public:
  void ClearSerializedPacketForTests(SerializedPacket* serialized_packet) {
    if (serialized_packet == nullptr) {
      return;
    }
    ClearSerializedPacket(serialized_packet);
  }

  void SaveSerializedPacket(SerializedPacket* serialized_packet) {
    if (serialized_packet == nullptr) {
      return;
    }
    delete[] serialized_packet_.encrypted_buffer;
    serialized_packet_ = *serialized_packet;
    serialized_packet_.encrypted_buffer = CopyBuffer(*serialized_packet);
    serialized_packet->retransmittable_frames.clear();
  }

  void DeleteSerializedPacket() {
    delete[] serialized_packet_.encrypted_buffer;
    serialized_packet_.encrypted_buffer = nullptr;
    ClearSerializedPacket(&serialized_packet_);
  }

 protected:
  QuicPacketCreatorTest()
      : connection_id_(TestConnectionId(2)),
        server_framer_(SupportedVersions(GetParam().version),
                       QuicTime::Zero(),
                       Perspective::IS_SERVER,
                       connection_id_.length()),
        client_framer_(SupportedVersions(GetParam().version),
                       QuicTime::Zero(),
                       Perspective::IS_CLIENT,
                       connection_id_.length()),
        data_("foo"),
        creator_(connection_id_, &client_framer_, &delegate_, &producer_),
        serialized_packet_(creator_.NoPacket()) {
    EXPECT_CALL(delegate_, GetPacketBuffer()).WillRepeatedly(Return(nullptr));
    creator_.SetEncrypter(ENCRYPTION_INITIAL, std::make_unique<NullEncrypter>(
                                                  Perspective::IS_CLIENT));
    creator_.SetEncrypter(ENCRYPTION_HANDSHAKE, std::make_unique<NullEncrypter>(
                                                    Perspective::IS_CLIENT));
    creator_.SetEncrypter(ENCRYPTION_ZERO_RTT, std::make_unique<NullEncrypter>(
                                                   Perspective::IS_CLIENT));
    creator_.SetEncrypter(
        ENCRYPTION_FORWARD_SECURE,
        std::make_unique<NullEncrypter>(Perspective::IS_CLIENT));
    client_framer_.set_visitor(&framer_visitor_);
    server_framer_.set_visitor(&framer_visitor_);
    client_framer_.set_data_producer(&producer_);
    if (server_framer_.version().KnowsWhichDecrypterToUse()) {
      server_framer_.InstallDecrypter(
          ENCRYPTION_INITIAL,
          std::make_unique<NullDecrypter>(Perspective::IS_SERVER));
      server_framer_.InstallDecrypter(
          ENCRYPTION_ZERO_RTT,
          std::make_unique<NullDecrypter>(Perspective::IS_SERVER));
      server_framer_.InstallDecrypter(
          ENCRYPTION_HANDSHAKE,
          std::make_unique<NullDecrypter>(Perspective::IS_SERVER));
      server_framer_.InstallDecrypter(
          ENCRYPTION_FORWARD_SECURE,
          std::make_unique<NullDecrypter>(Perspective::IS_SERVER));
    } else {
      server_framer_.SetDecrypter(
          ENCRYPTION_INITIAL,
          std::make_unique<NullDecrypter>(Perspective::IS_SERVER));
    }
  }

  ~QuicPacketCreatorTest() override {
    delete[] serialized_packet_.encrypted_buffer;
    ClearSerializedPacket(&serialized_packet_);
  }

  SerializedPacket SerializeAllFrames(const QuicFrames& frames) {
    SerializedPacket packet = QuicPacketCreatorPeer::SerializeAllFrames(
        &creator_, frames, buffer_, kMaxOutgoingPacketSize);
    EXPECT_EQ(QuicPacketCreatorPeer::GetEncryptionLevel(&creator_),
              packet.encryption_level);
    return packet;
  }

  void ProcessPacket(const SerializedPacket& packet) {
    QuicEncryptedPacket encrypted_packet(packet.encrypted_buffer,
                                         packet.encrypted_length);
    server_framer_.ProcessPacket(encrypted_packet);
  }

  void CheckStreamFrame(const QuicFrame& frame,
                        QuicStreamId stream_id,
                        const std::string& data,
                        QuicStreamOffset offset,
                        bool fin) {
    EXPECT_EQ(STREAM_FRAME, frame.type);
    EXPECT_EQ(stream_id, frame.stream_frame.stream_id);
    char buf[kMaxOutgoingPacketSize];
    QuicDataWriter writer(kMaxOutgoingPacketSize, buf, HOST_BYTE_ORDER);
    if (frame.stream_frame.data_length > 0) {
      producer_.WriteStreamData(stream_id, frame.stream_frame.offset,
                                frame.stream_frame.data_length, &writer);
    }
    EXPECT_EQ(data, QuicStringPiece(buf, frame.stream_frame.data_length));
    EXPECT_EQ(offset, frame.stream_frame.offset);
    EXPECT_EQ(fin, frame.stream_frame.fin);
  }

  // Returns the number of bytes consumed by the header of packet, including
  // the version.
  size_t GetPacketHeaderOverhead(QuicTransportVersion version) {
    return GetPacketHeaderSize(
        version, creator_.GetDestinationConnectionIdLength(),
        creator_.GetSourceConnectionIdLength(),
        QuicPacketCreatorPeer::SendVersionInPacket(&creator_),
        !kIncludeDiversificationNonce,
        QuicPacketCreatorPeer::GetPacketNumberLength(&creator_),
        QuicPacketCreatorPeer::GetRetryTokenLengthLength(&creator_), 0,
        QuicPacketCreatorPeer::GetLengthLength(&creator_));
  }

  // Returns the number of bytes of overhead that will be added to a packet
  // of maximum length.
  size_t GetEncryptionOverhead() {
    return creator_.max_packet_length() -
           client_framer_.GetMaxPlaintextSize(creator_.max_packet_length());
  }

  // Returns the number of bytes consumed by the non-data fields of a stream
  // frame, assuming it is the last frame in the packet
  size_t GetStreamFrameOverhead(QuicTransportVersion version) {
    return QuicFramer::GetMinStreamFrameSize(
        version, GetNthClientInitiatedStreamId(1), kOffset, true,
        /* data_length= */ 0);
  }

  QuicPendingRetransmission CreateRetransmission(
      const QuicFrames& retransmittable_frames,
      bool has_crypto_handshake,
      int num_padding_bytes,
      EncryptionLevel encryption_level,
      QuicPacketNumberLength packet_number_length) {
    return QuicPendingRetransmission(QuicPacketNumber(1u), NOT_RETRANSMISSION,
                                     retransmittable_frames,
                                     has_crypto_handshake, num_padding_bytes,
                                     encryption_level, packet_number_length);
  }

  bool IsDefaultTestConfiguration() {
    TestParams p = GetParam();
    return p.version == AllSupportedVersions()[0] && p.version_serialization;
  }

  QuicStreamId GetNthClientInitiatedStreamId(int n) const {
    return QuicUtils::GetFirstBidirectionalStreamId(
               creator_.transport_version(), Perspective::IS_CLIENT) +
           n * 2;
  }

  static const QuicStreamOffset kOffset = 0u;

  char buffer_[kMaxOutgoingPacketSize];
  QuicConnectionId connection_id_;
  QuicFrames frames_;
  QuicFramer server_framer_;
  QuicFramer client_framer_;
  StrictMock<MockFramerVisitor> framer_visitor_;
  StrictMock<MockPacketCreatorDelegate> delegate_;
  std::string data_;
  struct iovec iov_;
  TestPacketCreator creator_;
  SerializedPacket serialized_packet_;
  SimpleDataProducer producer_;
  SimpleBufferAllocator allocator_;
};

// Run all packet creator tests with all supported versions of QUIC, and with
// and without version in the packet header, as well as doing a run for each
// length of truncated connection id.
INSTANTIATE_TEST_SUITE_P(QuicPacketCreatorTests,
                         QuicPacketCreatorTest,
                         ::testing::ValuesIn(GetTestParams()),
                         ::testing::PrintToStringParamName());

TEST_P(QuicPacketCreatorTest, SerializeFrames) {
  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);
    creator_.set_encryption_level(level);
    frames_.push_back(QuicFrame(new QuicAckFrame(InitAckFrame(1))));
    QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
        client_framer_.transport_version(), Perspective::IS_CLIENT);
    if (level != ENCRYPTION_INITIAL && level != ENCRYPTION_HANDSHAKE) {
      frames_.push_back(
          QuicFrame(QuicStreamFrame(stream_id, false, 0u, QuicStringPiece())));
      frames_.push_back(
          QuicFrame(QuicStreamFrame(stream_id, true, 0u, QuicStringPiece())));
    }
    SerializedPacket serialized = SerializeAllFrames(frames_);
    EXPECT_EQ(level, serialized.encryption_level);
    delete frames_[0].ack_frame;
    frames_.clear();

    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      EXPECT_CALL(framer_visitor_, OnAckFrameStart(_, _))
          .WillOnce(Return(true));
      EXPECT_CALL(framer_visitor_,
                  OnAckRange(QuicPacketNumber(1), QuicPacketNumber(2)))
          .WillOnce(Return(true));
      EXPECT_CALL(framer_visitor_, OnAckFrameEnd(QuicPacketNumber(1)))
          .WillOnce(Return(true));
      if (level != ENCRYPTION_INITIAL && level != ENCRYPTION_HANDSHAKE) {
        EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
        EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
      }
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    ProcessPacket(serialized);
  }
}

TEST_P(QuicPacketCreatorTest, ReserializeFramesWithSequenceNumberLength) {
  if (VersionHasIetfInvariantHeader(client_framer_.transport_version())) {
    creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  }
  // If the original packet number length, the current packet number
  // length, and the configured send packet number length are different, the
  // retransmit must sent with the original length and the others do not change.
  QuicPacketCreatorPeer::SetPacketNumberLength(&creator_,
                                               PACKET_2BYTE_PACKET_NUMBER);
  QuicFrames frames;
  std::string data("a");
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    QuicStreamFrame stream_frame(
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
        /*fin=*/false, 0u, QuicStringPiece());
    frames.push_back(QuicFrame(stream_frame));
  } else {
    producer_.SaveCryptoData(ENCRYPTION_INITIAL, 0, data);
    frames.push_back(
        QuicFrame(new QuicCryptoFrame(ENCRYPTION_INITIAL, 0, data.length())));
  }
  char buffer[kMaxOutgoingPacketSize];
  QuicPendingRetransmission retransmission(CreateRetransmission(
      frames, true /* has_crypto_handshake */, -1 /* needs full padding */,
      ENCRYPTION_INITIAL, PACKET_4BYTE_PACKET_NUMBER));
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  creator_.ReserializeAllFrames(retransmission, buffer, kMaxOutgoingPacketSize);
  // The packet number length is updated after every packet is sent,
  // so there is no need to restore the old length after sending.
  EXPECT_EQ(PACKET_4BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
  EXPECT_EQ(PACKET_4BYTE_PACKET_NUMBER,
            serialized_packet_.packet_number_length);

  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
    if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
      EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    } else {
      EXPECT_CALL(framer_visitor_, OnCryptoFrame(_));
    }
    EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized_packet_);
  DeleteFrames(&frames);
}

TEST_P(QuicPacketCreatorTest, ReserializeCryptoFrameWithForwardSecurity) {
  QuicFrames frames;
  std::string data("a");
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    QuicStreamFrame stream_frame(
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
        /*fin=*/false, 0u, QuicStringPiece());
    frames.push_back(QuicFrame(stream_frame));
  } else {
    producer_.SaveCryptoData(ENCRYPTION_INITIAL, 0, data);
    frames.push_back(
        QuicFrame(new QuicCryptoFrame(ENCRYPTION_INITIAL, 0, data.length())));
  }
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  char buffer[kMaxOutgoingPacketSize];
  QuicPendingRetransmission retransmission(CreateRetransmission(
      frames, true /* has_crypto_handshake */, -1 /* needs full padding */,
      ENCRYPTION_INITIAL,
      QuicPacketCreatorPeer::GetPacketNumberLength(&creator_)));
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  creator_.ReserializeAllFrames(retransmission, buffer, kMaxOutgoingPacketSize);
  EXPECT_EQ(ENCRYPTION_INITIAL, serialized_packet_.encryption_level);
  DeleteFrames(&frames);
}

TEST_P(QuicPacketCreatorTest, ReserializeFrameWithForwardSecurity) {
  QuicStreamFrame stream_frame(0u, /*fin=*/false, 0u, QuicStringPiece());
  QuicFrames frames;
  frames.push_back(QuicFrame(stream_frame));
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  char buffer[kMaxOutgoingPacketSize];
  QuicPendingRetransmission retransmission(CreateRetransmission(
      frames, false /* has_crypto_handshake */, 0 /* no padding */,
      ENCRYPTION_INITIAL,
      QuicPacketCreatorPeer::GetPacketNumberLength(&creator_)));
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  creator_.ReserializeAllFrames(retransmission, buffer, kMaxOutgoingPacketSize);
  EXPECT_EQ(ENCRYPTION_FORWARD_SECURE, serialized_packet_.encryption_level);
}

TEST_P(QuicPacketCreatorTest, ReserializeFramesWithFullPadding) {
  QuicFrame frame;
  std::string data = "fake handshake message data";
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    MakeIOVector(data, &iov_);
    producer_.SaveStreamData(
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()), &iov_,
        1u, 0u, iov_.iov_len);
    QuicPacketCreatorPeer::CreateStreamFrame(
        &creator_,
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
        iov_.iov_len, 0u, false, &frame);
  } else {
    producer_.SaveCryptoData(ENCRYPTION_INITIAL, 0, data);
    EXPECT_TRUE(QuicPacketCreatorPeer::CreateCryptoFrame(
        &creator_, ENCRYPTION_INITIAL, data.length(), 0, &frame));
  }
  QuicFrames frames;
  frames.push_back(frame);
  char buffer[kMaxOutgoingPacketSize];
  QuicPendingRetransmission retransmission(CreateRetransmission(
      frames, true /* has_crypto_handshake */, -1 /* needs full padding */,
      ENCRYPTION_INITIAL,
      QuicPacketCreatorPeer::GetPacketNumberLength(&creator_)));
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  creator_.ReserializeAllFrames(retransmission, buffer, kMaxOutgoingPacketSize);
  EXPECT_EQ(kDefaultMaxPacketSize, serialized_packet_.encrypted_length);
  DeleteFrames(&frames);
}

TEST_P(QuicPacketCreatorTest, DoNotRetransmitPendingPadding) {
  QuicFrame frame;
  std::string data = "fake message data";
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    MakeIOVector(data, &iov_);
    producer_.SaveStreamData(
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()), &iov_,
        1u, 0u, iov_.iov_len);
    QuicPacketCreatorPeer::CreateStreamFrame(
        &creator_,
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
        iov_.iov_len, 0u, false, &frame);
  } else {
    producer_.SaveCryptoData(ENCRYPTION_INITIAL, 0, data);
    EXPECT_TRUE(QuicPacketCreatorPeer::CreateCryptoFrame(
        &creator_, ENCRYPTION_INITIAL, data.length(), 0, &frame));
  }

  const int kNumPaddingBytes1 = 4;
  int packet_size = 0;
  {
    QuicFrames frames;
    frames.push_back(frame);
    char buffer[kMaxOutgoingPacketSize];
    QuicPendingRetransmission retransmission(CreateRetransmission(
        frames, false /* has_crypto_handshake */,
        kNumPaddingBytes1 /* padding bytes */, ENCRYPTION_INITIAL,
        QuicPacketCreatorPeer::GetPacketNumberLength(&creator_)));
    EXPECT_CALL(delegate_, OnSerializedPacket(_))
        .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
    creator_.ReserializeAllFrames(retransmission, buffer,
                                  kMaxOutgoingPacketSize);
    packet_size = serialized_packet_.encrypted_length;
  }

  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
    if (QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
      EXPECT_CALL(framer_visitor_, OnCryptoFrame(_));
    } else {
      EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    }
    // Pending paddings are not retransmitted.
    EXPECT_CALL(framer_visitor_, OnPaddingFrame(_)).Times(0);
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized_packet_);

  const int kNumPaddingBytes2 = 44;
  QuicFrames frames;
  frames.push_back(frame);
  char buffer[kMaxOutgoingPacketSize];
  QuicPendingRetransmission retransmission(CreateRetransmission(
      frames, false /* has_crypto_handshake */,
      kNumPaddingBytes2 /* padding bytes */, ENCRYPTION_INITIAL,
      QuicPacketCreatorPeer::GetPacketNumberLength(&creator_)));
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  creator_.ReserializeAllFrames(retransmission, buffer, kMaxOutgoingPacketSize);

  EXPECT_EQ(packet_size, serialized_packet_.encrypted_length);
  DeleteFrames(&frames);
}

TEST_P(QuicPacketCreatorTest, ReserializeFramesWithFullPacketAndPadding) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  const size_t overhead =
      GetPacketHeaderOverhead(client_framer_.transport_version()) +
      GetEncryptionOverhead() +
      GetStreamFrameOverhead(client_framer_.transport_version());
  size_t capacity = kDefaultMaxPacketSize - overhead;
  for (int delta = -5; delta <= 0; ++delta) {
    std::string data(capacity + delta, 'A');
    size_t bytes_free = 0 - delta;

    QuicFrame frame;
    SimpleDataProducer producer;
    QuicPacketCreatorPeer::framer(&creator_)->set_data_producer(&producer);
    MakeIOVector(data, &iov_);
    QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
        client_framer_.transport_version(), Perspective::IS_CLIENT);
    producer.SaveStreamData(stream_id, &iov_, 1u, 0u, iov_.iov_len);
    QuicPacketCreatorPeer::CreateStreamFrame(&creator_, stream_id, iov_.iov_len,
                                             kOffset, false, &frame);
    QuicFrames frames;
    frames.push_back(frame);
    char buffer[kMaxOutgoingPacketSize];
    QuicPendingRetransmission retransmission(CreateRetransmission(
        frames, false /* has_crypto_handshake */, -1 /* needs full padding */,
        ENCRYPTION_FORWARD_SECURE,
        QuicPacketCreatorPeer::GetPacketNumberLength(&creator_)));
    EXPECT_CALL(delegate_, OnSerializedPacket(_))
        .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
    creator_.ReserializeAllFrames(retransmission, buffer,
                                  kMaxOutgoingPacketSize);

    // If there is not enough space in the packet to fit a padding frame
    // (1 byte) and to expand the stream frame (another 2 bytes) the packet
    // will not be padded.
    if (bytes_free < 3) {
      EXPECT_EQ(kDefaultMaxPacketSize - bytes_free,
                serialized_packet_.encrypted_length);
    } else {
      EXPECT_EQ(kDefaultMaxPacketSize, serialized_packet_.encrypted_length);
    }

    frames_.clear();
  }
}

TEST_P(QuicPacketCreatorTest, SerializeConnectionClose) {
  QuicConnectionCloseFrame frame(creator_.transport_version(), QUIC_NO_ERROR,
                                 "error",
                                 /*transport_close_frame_type=*/0);

  QuicFrames frames;
  frames.push_back(QuicFrame(&frame));
  SerializedPacket serialized = SerializeAllFrames(frames);
  EXPECT_EQ(ENCRYPTION_INITIAL, serialized.encryption_level);
  ASSERT_EQ(QuicPacketNumber(1u), serialized.packet_number);
  ASSERT_EQ(QuicPacketNumber(1u), creator_.packet_number());

  InSequence s;
  EXPECT_CALL(framer_visitor_, OnPacket());
  EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
  EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
  EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
  EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
  EXPECT_CALL(framer_visitor_, OnConnectionCloseFrame(_));
  EXPECT_CALL(framer_visitor_, OnPacketComplete());

  ProcessPacket(serialized);
}

TEST_P(QuicPacketCreatorTest, ConsumeCryptoDataToFillCurrentPacket) {
  std::string data = "crypto data";
  QuicFrame frame;
  ASSERT_TRUE(creator_.ConsumeCryptoDataToFillCurrentPacket(
      ENCRYPTION_INITIAL, data.length(), 0,
      /*needs_full_padding=*/true, NOT_RETRANSMISSION, &frame));
  EXPECT_EQ(frame.crypto_frame->data_length, data.length());
  EXPECT_TRUE(creator_.HasPendingFrames());
}

TEST_P(QuicPacketCreatorTest, ConsumeDataToFillCurrentPacket) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  QuicFrame frame;
  MakeIOVector("test", &iov_);
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
      stream_id, &iov_, 1u, iov_.iov_len, 0u, 0u, false, false,
      NOT_RETRANSMISSION, &frame));
  size_t consumed = frame.stream_frame.data_length;
  EXPECT_EQ(4u, consumed);
  CheckStreamFrame(frame, stream_id, "test", 0u, false);
  EXPECT_TRUE(creator_.HasPendingFrames());
}

TEST_P(QuicPacketCreatorTest, ConsumeDataFin) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  QuicFrame frame;
  MakeIOVector("test", &iov_);
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
      stream_id, &iov_, 1u, iov_.iov_len, 0u, 0u, true, false,
      NOT_RETRANSMISSION, &frame));
  size_t consumed = frame.stream_frame.data_length;
  EXPECT_EQ(4u, consumed);
  CheckStreamFrame(frame, stream_id, "test", 0u, true);
  EXPECT_TRUE(creator_.HasPendingFrames());
}

TEST_P(QuicPacketCreatorTest, ConsumeDataFinOnly) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  QuicFrame frame;
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
      stream_id, nullptr, 0u, 0u, 0u, 0u, true, false, NOT_RETRANSMISSION,
      &frame));
  size_t consumed = frame.stream_frame.data_length;
  EXPECT_EQ(0u, consumed);
  CheckStreamFrame(frame, stream_id, std::string(), 0u, true);
  EXPECT_TRUE(creator_.HasPendingFrames());
}

TEST_P(QuicPacketCreatorTest, CreateAllFreeBytesForStreamFrames) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  const size_t overhead =
      GetPacketHeaderOverhead(client_framer_.transport_version()) +
      GetEncryptionOverhead();
  for (size_t i = overhead + QuicPacketCreator::MinPlaintextPacketSize(
                                 client_framer_.version());
       i < overhead + 100; ++i) {
    SCOPED_TRACE(i);
    creator_.SetMaxPacketLength(i);
    const bool should_have_room =
        i >
        overhead + GetStreamFrameOverhead(client_framer_.transport_version());
    ASSERT_EQ(should_have_room,
              creator_.HasRoomForStreamFrame(GetNthClientInitiatedStreamId(1),
                                             kOffset, /* data_size=*/0xffff));
    if (should_have_room) {
      QuicFrame frame;
      MakeIOVector("testdata", &iov_);
      EXPECT_CALL(delegate_, OnSerializedPacket(_))
          .WillRepeatedly(Invoke(
              this, &QuicPacketCreatorTest::ClearSerializedPacketForTests));
      ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
          GetNthClientInitiatedStreamId(1), &iov_, 1u, iov_.iov_len, 0u,
          kOffset, false, false, NOT_RETRANSMISSION, &frame));
      size_t bytes_consumed = frame.stream_frame.data_length;
      EXPECT_LT(0u, bytes_consumed);
      creator_.FlushCurrentPacket();
    }
  }
}

TEST_P(QuicPacketCreatorTest, StreamFrameConsumption) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  // Compute the total overhead for a single frame in packet.
  const size_t overhead =
      GetPacketHeaderOverhead(client_framer_.transport_version()) +
      GetEncryptionOverhead() +
      GetStreamFrameOverhead(client_framer_.transport_version());
  size_t capacity = kDefaultMaxPacketSize - overhead;
  // Now, test various sizes around this size.
  for (int delta = -5; delta <= 5; ++delta) {
    std::string data(capacity + delta, 'A');
    size_t bytes_free = delta > 0 ? 0 : 0 - delta;
    QuicFrame frame;
    MakeIOVector(data, &iov_);
    ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
        GetNthClientInitiatedStreamId(1), &iov_, 1u, iov_.iov_len, 0u, kOffset,
        false, false, NOT_RETRANSMISSION, &frame));

    // BytesFree() returns bytes available for the next frame, which will
    // be two bytes smaller since the stream frame would need to be grown.
    EXPECT_EQ(2u, creator_.ExpansionOnNewFrame());
    size_t expected_bytes_free = bytes_free < 3 ? 0 : bytes_free - 2;
    EXPECT_EQ(expected_bytes_free, creator_.BytesFree()) << "delta: " << delta;
    EXPECT_CALL(delegate_, OnSerializedPacket(_))
        .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
    creator_.FlushCurrentPacket();
    ASSERT_TRUE(serialized_packet_.encrypted_buffer);
    DeleteSerializedPacket();
  }
}

TEST_P(QuicPacketCreatorTest, CryptoStreamFramePacketPadding) {
  // This test serializes crypto payloads slightly larger than a packet, which
  // Causes the multi-packet ClientHello check to fail.
  SetQuicFlag(FLAGS_quic_enforce_single_packet_chlo, false);
  // Compute the total overhead for a single frame in packet.
  size_t overhead =
      GetPacketHeaderOverhead(client_framer_.transport_version()) +
      GetEncryptionOverhead();
  if (QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    overhead +=
        QuicFramer::GetMinCryptoFrameSize(kOffset, kMaxOutgoingPacketSize);
  } else {
    overhead += GetStreamFrameOverhead(client_framer_.transport_version());
  }
  ASSERT_GT(kMaxOutgoingPacketSize, overhead);
  size_t capacity = kDefaultMaxPacketSize - overhead;
  // Now, test various sizes around this size.
  for (int delta = -5; delta <= 5; ++delta) {
    SCOPED_TRACE(delta);
    std::string data(capacity + delta, 'A');
    size_t bytes_free = delta > 0 ? 0 : 0 - delta;

    QuicFrame frame;
    MakeIOVector(data, &iov_);
    EXPECT_CALL(delegate_, OnSerializedPacket(_))
        .WillRepeatedly(
            Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
    if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
      ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
          QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
          &iov_, 1u, iov_.iov_len, 0u, kOffset, false, true, NOT_RETRANSMISSION,
          &frame));
      size_t bytes_consumed = frame.stream_frame.data_length;
      EXPECT_LT(0u, bytes_consumed);
    } else {
      producer_.SaveCryptoData(ENCRYPTION_INITIAL, kOffset, data);
      ASSERT_TRUE(creator_.ConsumeCryptoDataToFillCurrentPacket(
          ENCRYPTION_INITIAL, data.length(), kOffset,
          /*needs_full_padding=*/true, NOT_RETRANSMISSION, &frame));
      size_t bytes_consumed = frame.crypto_frame->data_length;
      EXPECT_LT(0u, bytes_consumed);
    }
    creator_.FlushCurrentPacket();
    ASSERT_TRUE(serialized_packet_.encrypted_buffer);
    // If there is not enough space in the packet to fit a padding frame
    // (1 byte) and to expand the stream frame (another 2 bytes) the packet
    // will not be padded.
    if (bytes_free < 3 &&
        !QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
      EXPECT_EQ(kDefaultMaxPacketSize - bytes_free,
                serialized_packet_.encrypted_length);
    } else {
      EXPECT_EQ(kDefaultMaxPacketSize, serialized_packet_.encrypted_length);
    }
    DeleteSerializedPacket();
  }
}

TEST_P(QuicPacketCreatorTest, NonCryptoStreamFramePacketNonPadding) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  // Compute the total overhead for a single frame in packet.
  const size_t overhead =
      GetPacketHeaderOverhead(client_framer_.transport_version()) +
      GetEncryptionOverhead() +
      GetStreamFrameOverhead(client_framer_.transport_version());
  ASSERT_GT(kDefaultMaxPacketSize, overhead);
  size_t capacity = kDefaultMaxPacketSize - overhead;
  // Now, test various sizes around this size.
  for (int delta = -5; delta <= 5; ++delta) {
    std::string data(capacity + delta, 'A');
    size_t bytes_free = delta > 0 ? 0 : 0 - delta;

    QuicFrame frame;
    MakeIOVector(data, &iov_);
    EXPECT_CALL(delegate_, OnSerializedPacket(_))
        .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
    ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
        GetNthClientInitiatedStreamId(1), &iov_, 1u, iov_.iov_len, 0u, kOffset,
        false, false, NOT_RETRANSMISSION, &frame));
    size_t bytes_consumed = frame.stream_frame.data_length;
    EXPECT_LT(0u, bytes_consumed);
    creator_.FlushCurrentPacket();
    ASSERT_TRUE(serialized_packet_.encrypted_buffer);
    if (bytes_free > 0) {
      EXPECT_EQ(kDefaultMaxPacketSize - bytes_free,
                serialized_packet_.encrypted_length);
    } else {
      EXPECT_EQ(kDefaultMaxPacketSize, serialized_packet_.encrypted_length);
    }
    DeleteSerializedPacket();
  }
}

TEST_P(QuicPacketCreatorTest, SerializeVersionNegotiationPacket) {
  QuicFramerPeer::SetPerspective(&client_framer_, Perspective::IS_SERVER);
  ParsedQuicVersionVector versions;
  versions.push_back(test::QuicVersionMax());
  const bool ietf_quic =
      VersionHasIetfInvariantHeader(creator_.transport_version());
  const bool has_length_prefix =
      GetParam().version.HasLengthPrefixedConnectionIds();
  std::unique_ptr<QuicEncryptedPacket> encrypted(
      creator_.SerializeVersionNegotiationPacket(ietf_quic, has_length_prefix,
                                                 versions));

  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnVersionNegotiationPacket(_));
  }
  QuicFramerPeer::SetPerspective(&client_framer_, Perspective::IS_CLIENT);
  client_framer_.ProcessPacket(*encrypted);
}

// Test that the path challenge connectivity probing packet is serialized
// correctly as a padded PATH CHALLENGE packet.
TEST_P(QuicPacketCreatorTest, BuildPathChallengePacket) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    // This frame is only for IETF QUIC.
    return;
  }

  QuicPacketHeader header;
  header.destination_connection_id = kTestConnectionId;
  header.reset_flag = false;
  header.version_flag = false;
  header.packet_number = kPacketNumber;
  QuicPathFrameBuffer payload;

  // clang-format off
  unsigned char packet[] = {
    // type (short header, 4 byte packet number)
    0x43,
    // connection_id
    0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    // packet number
    0x12, 0x34, 0x56, 0x78,

    // Path Challenge Frame type (IETF_PATH_CHALLENGE)
    0x1a,
    // 8 "random" bytes, MockRandom makes lots of r's
    'r', 'r', 'r', 'r', 'r', 'r', 'r', 'r',
    // frame type (padding frame)
    0x00,
    0x00, 0x00, 0x00, 0x00
  };
  // clang-format on

  std::unique_ptr<char[]> buffer(new char[kMaxOutgoingPacketSize]);
  MockRandom randomizer;

  size_t length = creator_.BuildPaddedPathChallengePacket(
      header, buffer.get(), QUIC_ARRAYSIZE(packet), &payload, &randomizer,
      ENCRYPTION_INITIAL);
  EXPECT_EQ(length, QUIC_ARRAYSIZE(packet));

  // Payload has the random bytes that were generated. Copy them into packet,
  // above, before checking that the generated packet is correct.
  EXPECT_EQ(kQuicPathFrameBufferSize, payload.size());

  QuicPacket data(creator_.transport_version(), buffer.release(), length, true,
                  header);

  test::CompareCharArraysWithHexError(
      "constructed packet", data.data(), data.length(),
      reinterpret_cast<char*>(packet), QUIC_ARRAYSIZE(packet));
}

TEST_P(QuicPacketCreatorTest, BuildConnectivityProbingPacket) {
  QuicPacketHeader header;
  header.destination_connection_id = kTestConnectionId;
  header.reset_flag = false;
  header.version_flag = false;
  header.packet_number = kPacketNumber;

  // clang-format off
  unsigned char packet[] = {
    // public flags (8 byte connection_id)
    0x2C,
    // connection_id
    0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    // packet number
    0x12, 0x34, 0x56, 0x78,

    // frame type (ping frame)
    0x07,
    // frame type (padding frame)
    0x00,
    0x00, 0x00, 0x00, 0x00
  };

  unsigned char packet46[] = {
    // type (short header, 4 byte packet number)
    0x43,
    // connection_id
    0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    // packet number
    0x12, 0x34, 0x56, 0x78,

    // frame type
    0x07,
    // frame type (padding frame)
    0x00,
    0x00, 0x00, 0x00, 0x00
  };

  unsigned char packet99[] = {
    // type (short header, 4 byte packet number)
    0x43,
    // connection_id
    0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    // packet number
    0x12, 0x34, 0x56, 0x78,

    // frame type (IETF_PING frame)
    0x01,
    // frame type (padding frame)
    0x00,
    0x00, 0x00, 0x00, 0x00
  };
  // clang-format on

  unsigned char* p = packet;
  size_t packet_size = QUIC_ARRAYSIZE(packet);
  if (VersionHasIetfQuicFrames(creator_.transport_version())) {
    p = packet99;
    packet_size = QUIC_ARRAYSIZE(packet99);
  } else if (creator_.transport_version() >= QUIC_VERSION_46) {
    p = packet46;
    packet_size = QUIC_ARRAYSIZE(packet46);
  }

  std::unique_ptr<char[]> buffer(new char[kMaxOutgoingPacketSize]);

  size_t length = creator_.BuildConnectivityProbingPacket(
      header, buffer.get(), packet_size, ENCRYPTION_INITIAL);

  EXPECT_NE(0u, length);
  QuicPacket data(creator_.transport_version(), buffer.release(), length, true,
                  header);

  test::CompareCharArraysWithHexError("constructed packet", data.data(),
                                      data.length(), reinterpret_cast<char*>(p),
                                      packet_size);
}

// Several tests that the path response connectivity probing packet is
// serialized correctly as either a padded and unpadded PATH RESPONSE
// packet. Also generates packets with 1 and 3 PATH_RESPONSES in them to
// exercised the single- and multiple- payload cases.
TEST_P(QuicPacketCreatorTest, BuildPathResponsePacket1ResponseUnpadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    // This frame is only for IETF QUIC.
    return;
  }

  QuicPacketHeader header;
  header.destination_connection_id = kTestConnectionId;
  header.reset_flag = false;
  header.version_flag = false;
  header.packet_number = kPacketNumber;
  QuicPathFrameBuffer payload0 = {
      {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}};

  // Build 1 PATH RESPONSE, not padded
  // clang-format off
  unsigned char packet[] = {
    // type (short header, 4 byte packet number)
    0x43,
    // connection_id
    0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    // packet number
    0x12, 0x34, 0x56, 0x78,

    // Path Response Frame type (IETF_PATH_RESPONSE)
    0x1b,
    // 8 "random" bytes
    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
  };
  // clang-format on
  std::unique_ptr<char[]> buffer(new char[kMaxOutgoingPacketSize]);
  QuicDeque<QuicPathFrameBuffer> payloads;
  payloads.push_back(payload0);
  size_t length = creator_.BuildPathResponsePacket(
      header, buffer.get(), QUIC_ARRAYSIZE(packet), payloads,
      /*is_padded=*/false, ENCRYPTION_INITIAL);
  EXPECT_EQ(length, QUIC_ARRAYSIZE(packet));
  QuicPacket data(creator_.transport_version(), buffer.release(), length, true,
                  header);

  test::CompareCharArraysWithHexError(
      "constructed packet", data.data(), data.length(),
      reinterpret_cast<char*>(packet), QUIC_ARRAYSIZE(packet));
}

TEST_P(QuicPacketCreatorTest, BuildPathResponsePacket1ResponsePadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    // This frame is only for IETF QUIC.
    return;
  }

  QuicPacketHeader header;
  header.destination_connection_id = kTestConnectionId;
  header.reset_flag = false;
  header.version_flag = false;
  header.packet_number = kPacketNumber;
  QuicPathFrameBuffer payload0 = {
      {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}};

  // Build 1 PATH RESPONSE, padded
  // clang-format off
  unsigned char packet[] = {
    // type (short header, 4 byte packet number)
    0x43,
    // connection_id
    0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    // packet number
    0x12, 0x34, 0x56, 0x78,

    // Path Response Frame type (IETF_PATH_RESPONSE)
    0x1b,
    // 8 "random" bytes
    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
    // Padding type and pad
    0x00, 0x00, 0x00, 0x00, 0x00
  };
  // clang-format on
  std::unique_ptr<char[]> buffer(new char[kMaxOutgoingPacketSize]);
  QuicDeque<QuicPathFrameBuffer> payloads;
  payloads.push_back(payload0);
  size_t length = creator_.BuildPathResponsePacket(
      header, buffer.get(), QUIC_ARRAYSIZE(packet), payloads,
      /*is_padded=*/true, ENCRYPTION_INITIAL);
  EXPECT_EQ(length, QUIC_ARRAYSIZE(packet));
  QuicPacket data(creator_.transport_version(), buffer.release(), length, true,
                  header);

  test::CompareCharArraysWithHexError(
      "constructed packet", data.data(), data.length(),
      reinterpret_cast<char*>(packet), QUIC_ARRAYSIZE(packet));
}

TEST_P(QuicPacketCreatorTest, BuildPathResponsePacket3ResponsesUnpadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    // This frame is only for IETF QUIC.
    return;
  }

  QuicPacketHeader header;
  header.destination_connection_id = kTestConnectionId;
  header.reset_flag = false;
  header.version_flag = false;
  header.packet_number = kPacketNumber;
  QuicPathFrameBuffer payload0 = {
      {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}};
  QuicPathFrameBuffer payload1 = {
      {0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18}};
  QuicPathFrameBuffer payload2 = {
      {0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28}};

  // Build one packet with 3 PATH RESPONSES, no padding
  // clang-format off
  unsigned char packet[] = {
    // type (short header, 4 byte packet number)
    0x43,
    // connection_id
    0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    // packet number
    0x12, 0x34, 0x56, 0x78,

    // 3 path response frames (IETF_PATH_RESPONSE type byte and payload)
    0x1b, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
    0x1b, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
    0x1b, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
  };
  // clang-format on

  std::unique_ptr<char[]> buffer(new char[kMaxOutgoingPacketSize]);
  QuicDeque<QuicPathFrameBuffer> payloads;
  payloads.push_back(payload0);
  payloads.push_back(payload1);
  payloads.push_back(payload2);
  size_t length = creator_.BuildPathResponsePacket(
      header, buffer.get(), QUIC_ARRAYSIZE(packet), payloads,
      /*is_padded=*/false, ENCRYPTION_INITIAL);
  EXPECT_EQ(length, QUIC_ARRAYSIZE(packet));
  QuicPacket data(creator_.transport_version(), buffer.release(), length, true,
                  header);

  test::CompareCharArraysWithHexError(
      "constructed packet", data.data(), data.length(),
      reinterpret_cast<char*>(packet), QUIC_ARRAYSIZE(packet));
}

TEST_P(QuicPacketCreatorTest, BuildPathResponsePacket3ResponsesPadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    // This frame is only for IETF QUIC.
    return;
  }

  QuicPacketHeader header;
  header.destination_connection_id = kTestConnectionId;
  header.reset_flag = false;
  header.version_flag = false;
  header.packet_number = kPacketNumber;
  QuicPathFrameBuffer payload0 = {
      {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08}};
  QuicPathFrameBuffer payload1 = {
      {0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18}};
  QuicPathFrameBuffer payload2 = {
      {0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28}};

  // Build one packet with 3 PATH RESPONSES, with padding
  // clang-format off
  unsigned char packet[] = {
    // type (short header, 4 byte packet number)
    0x43,
    // connection_id
    0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10,
    // packet number
    0x12, 0x34, 0x56, 0x78,

    // 3 path response frames (IETF_PATH_RESPONSE byte and payload)
    0x1b, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
    0x1b, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
    0x1b, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
    // Padding
    0x00, 0x00, 0x00, 0x00, 0x00
  };
  // clang-format on

  std::unique_ptr<char[]> buffer(new char[kMaxOutgoingPacketSize]);
  QuicDeque<QuicPathFrameBuffer> payloads;
  payloads.push_back(payload0);
  payloads.push_back(payload1);
  payloads.push_back(payload2);
  size_t length = creator_.BuildPathResponsePacket(
      header, buffer.get(), QUIC_ARRAYSIZE(packet), payloads,
      /*is_padded=*/true, ENCRYPTION_INITIAL);
  EXPECT_EQ(length, QUIC_ARRAYSIZE(packet));
  QuicPacket data(creator_.transport_version(), buffer.release(), length, true,
                  header);

  test::CompareCharArraysWithHexError(
      "constructed packet", data.data(), data.length(),
      reinterpret_cast<char*>(packet), QUIC_ARRAYSIZE(packet));
}

TEST_P(QuicPacketCreatorTest, SerializeConnectivityProbingPacket) {
  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);

    creator_.set_encryption_level(level);

    OwningSerializedPacketPointer encrypted;
    if (VersionHasIetfQuicFrames(creator_.transport_version())) {
      QuicPathFrameBuffer payload = {
          {0xde, 0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xfe}};
      encrypted =
          creator_.SerializePathChallengeConnectivityProbingPacket(&payload);
    } else {
      encrypted = creator_.SerializeConnectivityProbingPacket();
    }
    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      if (VersionHasIetfQuicFrames(creator_.transport_version())) {
        EXPECT_CALL(framer_visitor_, OnPathChallengeFrame(_));
        EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
      } else {
        EXPECT_CALL(framer_visitor_, OnPingFrame(_));
        EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
      }
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    // QuicFramerPeer::SetPerspective(&client_framer_, Perspective::IS_SERVER);
    server_framer_.ProcessPacket(QuicEncryptedPacket(
        encrypted->encrypted_buffer, encrypted->encrypted_length));
  }
}

TEST_P(QuicPacketCreatorTest, SerializePathChallengeProbePacket) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    return;
  }
  QuicPathFrameBuffer payload = {
      {0xde, 0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee}};

  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);

    creator_.set_encryption_level(level);

    OwningSerializedPacketPointer encrypted(
        creator_.SerializePathChallengeConnectivityProbingPacket(&payload));
    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      EXPECT_CALL(framer_visitor_, OnPathChallengeFrame(_));
      EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    // QuicFramerPeer::SetPerspective(&client_framer_, Perspective::IS_SERVER);
    server_framer_.ProcessPacket(QuicEncryptedPacket(
        encrypted->encrypted_buffer, encrypted->encrypted_length));
  }
}

TEST_P(QuicPacketCreatorTest, SerializePathResponseProbePacket1PayloadPadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    return;
  }
  QuicPathFrameBuffer payload0 = {
      {0xde, 0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee}};

  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);
    creator_.set_encryption_level(level);

    QuicDeque<QuicPathFrameBuffer> payloads;
    payloads.push_back(payload0);

    OwningSerializedPacketPointer encrypted(
        creator_.SerializePathResponseConnectivityProbingPacket(payloads,
                                                                true));
    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      EXPECT_CALL(framer_visitor_, OnPathResponseFrame(_));
      EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    server_framer_.ProcessPacket(QuicEncryptedPacket(
        encrypted->encrypted_buffer, encrypted->encrypted_length));
  }
}

TEST_P(QuicPacketCreatorTest,
       SerializePathResponseProbePacket1PayloadUnPadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    return;
  }
  QuicPathFrameBuffer payload0 = {
      {0xde, 0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee}};

  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);
    creator_.set_encryption_level(level);

    QuicDeque<QuicPathFrameBuffer> payloads;
    payloads.push_back(payload0);

    OwningSerializedPacketPointer encrypted(
        creator_.SerializePathResponseConnectivityProbingPacket(payloads,
                                                                false));
    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      EXPECT_CALL(framer_visitor_, OnPathResponseFrame(_));
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    server_framer_.ProcessPacket(QuicEncryptedPacket(
        encrypted->encrypted_buffer, encrypted->encrypted_length));
  }
}

TEST_P(QuicPacketCreatorTest, SerializePathResponseProbePacket2PayloadsPadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    return;
  }
  QuicPathFrameBuffer payload0 = {
      {0xde, 0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee}};
  QuicPathFrameBuffer payload1 = {
      {0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee, 0xde}};

  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);
    creator_.set_encryption_level(level);

    QuicDeque<QuicPathFrameBuffer> payloads;
    payloads.push_back(payload0);
    payloads.push_back(payload1);

    OwningSerializedPacketPointer encrypted(
        creator_.SerializePathResponseConnectivityProbingPacket(payloads,
                                                                true));
    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      EXPECT_CALL(framer_visitor_, OnPathResponseFrame(_)).Times(2);
      EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    server_framer_.ProcessPacket(QuicEncryptedPacket(
        encrypted->encrypted_buffer, encrypted->encrypted_length));
  }
}

TEST_P(QuicPacketCreatorTest,
       SerializePathResponseProbePacket2PayloadsUnPadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    return;
  }
  QuicPathFrameBuffer payload0 = {
      {0xde, 0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee}};
  QuicPathFrameBuffer payload1 = {
      {0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee, 0xde}};

  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);
    creator_.set_encryption_level(level);

    QuicDeque<QuicPathFrameBuffer> payloads;
    payloads.push_back(payload0);
    payloads.push_back(payload1);

    OwningSerializedPacketPointer encrypted(
        creator_.SerializePathResponseConnectivityProbingPacket(payloads,
                                                                false));
    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      EXPECT_CALL(framer_visitor_, OnPathResponseFrame(_)).Times(2);
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    server_framer_.ProcessPacket(QuicEncryptedPacket(
        encrypted->encrypted_buffer, encrypted->encrypted_length));
  }
}

TEST_P(QuicPacketCreatorTest, SerializePathResponseProbePacket3PayloadsPadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    return;
  }
  QuicPathFrameBuffer payload0 = {
      {0xde, 0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee}};
  QuicPathFrameBuffer payload1 = {
      {0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee, 0xde}};
  QuicPathFrameBuffer payload2 = {
      {0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee, 0xde, 0xad}};

  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);
    creator_.set_encryption_level(level);

    QuicDeque<QuicPathFrameBuffer> payloads;
    payloads.push_back(payload0);
    payloads.push_back(payload1);
    payloads.push_back(payload2);

    OwningSerializedPacketPointer encrypted(
        creator_.SerializePathResponseConnectivityProbingPacket(payloads,
                                                                true));
    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      EXPECT_CALL(framer_visitor_, OnPathResponseFrame(_)).Times(3);
      EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    server_framer_.ProcessPacket(QuicEncryptedPacket(
        encrypted->encrypted_buffer, encrypted->encrypted_length));
  }
}

TEST_P(QuicPacketCreatorTest,
       SerializePathResponseProbePacket3PayloadsUnpadded) {
  if (!VersionHasIetfQuicFrames(creator_.transport_version())) {
    return;
  }
  QuicPathFrameBuffer payload0 = {
      {0xde, 0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee}};
  QuicPathFrameBuffer payload1 = {
      {0xad, 0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee, 0xde}};
  QuicPathFrameBuffer payload2 = {
      {0xbe, 0xef, 0xba, 0xdc, 0x0f, 0xee, 0xde, 0xad}};

  for (int i = ENCRYPTION_INITIAL; i < NUM_ENCRYPTION_LEVELS; ++i) {
    EncryptionLevel level = static_cast<EncryptionLevel>(i);
    creator_.set_encryption_level(level);

    QuicDeque<QuicPathFrameBuffer> payloads;
    payloads.push_back(payload0);
    payloads.push_back(payload1);
    payloads.push_back(payload2);

    OwningSerializedPacketPointer encrypted(
        creator_.SerializePathResponseConnectivityProbingPacket(payloads,
                                                                false));
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
    EXPECT_CALL(framer_visitor_, OnPathResponseFrame(_)).Times(3);
    EXPECT_CALL(framer_visitor_, OnPacketComplete());

    server_framer_.ProcessPacket(QuicEncryptedPacket(
        encrypted->encrypted_buffer, encrypted->encrypted_length));
  }
}

TEST_P(QuicPacketCreatorTest, UpdatePacketSequenceNumberLengthLeastAwaiting) {
  if (VersionHasIetfInvariantHeader(creator_.transport_version()) &&
      !GetParam().version.SendsVariableLengthPacketNumberInLongHeader()) {
    EXPECT_EQ(PACKET_4BYTE_PACKET_NUMBER,
              QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
    creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  } else {
    EXPECT_EQ(PACKET_1BYTE_PACKET_NUMBER,
              QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
  }

  QuicPacketCreatorPeer::SetPacketNumber(&creator_, 64);
  creator_.UpdatePacketNumberLength(QuicPacketNumber(2),
                                    10000 / kDefaultMaxPacketSize);
  EXPECT_EQ(PACKET_1BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));

  QuicPacketCreatorPeer::SetPacketNumber(&creator_, 64 * 256);
  creator_.UpdatePacketNumberLength(QuicPacketNumber(2),
                                    10000 / kDefaultMaxPacketSize);
  EXPECT_EQ(PACKET_2BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));

  QuicPacketCreatorPeer::SetPacketNumber(&creator_, 64 * 256 * 256);
  creator_.UpdatePacketNumberLength(QuicPacketNumber(2),
                                    10000 / kDefaultMaxPacketSize);
  EXPECT_EQ(PACKET_4BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));

  QuicPacketCreatorPeer::SetPacketNumber(&creator_,
                                         UINT64_C(64) * 256 * 256 * 256 * 256);
  creator_.UpdatePacketNumberLength(QuicPacketNumber(2),
                                    10000 / kDefaultMaxPacketSize);
  EXPECT_EQ(PACKET_6BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
}

TEST_P(QuicPacketCreatorTest, UpdatePacketSequenceNumberLengthCwnd) {
  QuicPacketCreatorPeer::SetPacketNumber(&creator_, 1);
  if (VersionHasIetfInvariantHeader(creator_.transport_version()) &&
      !GetParam().version.SendsVariableLengthPacketNumberInLongHeader()) {
    EXPECT_EQ(PACKET_4BYTE_PACKET_NUMBER,
              QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
    creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  } else {
    EXPECT_EQ(PACKET_1BYTE_PACKET_NUMBER,
              QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
  }

  creator_.UpdatePacketNumberLength(QuicPacketNumber(1),
                                    10000 / kDefaultMaxPacketSize);
  EXPECT_EQ(PACKET_1BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));

  creator_.UpdatePacketNumberLength(QuicPacketNumber(1),
                                    10000 * 256 / kDefaultMaxPacketSize);
  EXPECT_EQ(PACKET_2BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));

  creator_.UpdatePacketNumberLength(QuicPacketNumber(1),
                                    10000 * 256 * 256 / kDefaultMaxPacketSize);
  EXPECT_EQ(PACKET_4BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));

  creator_.UpdatePacketNumberLength(
      QuicPacketNumber(1),
      UINT64_C(1000) * 256 * 256 * 256 * 256 / kDefaultMaxPacketSize);
  EXPECT_EQ(PACKET_6BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
}

TEST_P(QuicPacketCreatorTest, SkipNPacketNumbers) {
  QuicPacketCreatorPeer::SetPacketNumber(&creator_, 1);
  if (VersionHasIetfInvariantHeader(creator_.transport_version()) &&
      !GetParam().version.SendsVariableLengthPacketNumberInLongHeader()) {
    EXPECT_EQ(PACKET_4BYTE_PACKET_NUMBER,
              QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
    creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  } else {
    EXPECT_EQ(PACKET_1BYTE_PACKET_NUMBER,
              QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
  }
  creator_.SkipNPacketNumbers(63, QuicPacketNumber(2),
                              10000 / kDefaultMaxPacketSize);
  EXPECT_EQ(QuicPacketNumber(64), creator_.packet_number());
  EXPECT_EQ(PACKET_1BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));

  creator_.SkipNPacketNumbers(64 * 255, QuicPacketNumber(2),
                              10000 / kDefaultMaxPacketSize);
  EXPECT_EQ(QuicPacketNumber(64 * 256), creator_.packet_number());
  EXPECT_EQ(PACKET_2BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));

  creator_.SkipNPacketNumbers(64 * 256 * 255, QuicPacketNumber(2),
                              10000 / kDefaultMaxPacketSize);
  EXPECT_EQ(QuicPacketNumber(64 * 256 * 256), creator_.packet_number());
  EXPECT_EQ(PACKET_4BYTE_PACKET_NUMBER,
            QuicPacketCreatorPeer::GetPacketNumberLength(&creator_));
}

TEST_P(QuicPacketCreatorTest, SerializeFrame) {
  if (!GetParam().version_serialization) {
    creator_.StopSendingVersion();
  }
  std::string data("test data");
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    QuicStreamFrame stream_frame(
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
        /*fin=*/false, 0u, QuicStringPiece());
    frames_.push_back(QuicFrame(stream_frame));
  } else {
    producer_.SaveCryptoData(ENCRYPTION_INITIAL, 0, data);
    frames_.push_back(
        QuicFrame(new QuicCryptoFrame(ENCRYPTION_INITIAL, 0, data.length())));
  }
  SerializedPacket serialized = SerializeAllFrames(frames_);

  QuicPacketHeader header;
  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_))
        .WillOnce(DoAll(SaveArg<0>(&header), Return(true)));
    if (QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
      EXPECT_CALL(framer_visitor_, OnCryptoFrame(_));
    } else {
      EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    }
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized);
  EXPECT_EQ(GetParam().version_serialization, header.version_flag);
  DeleteFrames(&frames_);
}

TEST_P(QuicPacketCreatorTest, SerializeFrameShortData) {
  if (!GetParam().version_serialization) {
    creator_.StopSendingVersion();
  }
  std::string data("a");
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    QuicStreamFrame stream_frame(
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
        /*fin=*/false, 0u, QuicStringPiece());
    frames_.push_back(QuicFrame(stream_frame));
  } else {
    producer_.SaveCryptoData(ENCRYPTION_INITIAL, 0, data);
    frames_.push_back(
        QuicFrame(new QuicCryptoFrame(ENCRYPTION_INITIAL, 0, data.length())));
  }
  SerializedPacket serialized = SerializeAllFrames(frames_);

  QuicPacketHeader header;
  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_))
        .WillOnce(DoAll(SaveArg<0>(&header), Return(true)));
    if (QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
      EXPECT_CALL(framer_visitor_, OnCryptoFrame(_));
    } else {
      EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    }
    if (client_framer_.version().HasHeaderProtection()) {
      EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
    }
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized);
  EXPECT_EQ(GetParam().version_serialization, header.version_flag);
  DeleteFrames(&frames_);
}

TEST_P(QuicPacketCreatorTest, ConsumeDataLargerThanOneStreamFrame) {
  if (!GetParam().version_serialization) {
    creator_.StopSendingVersion();
  }
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  // A string larger than fits into a frame.
  QuicFrame frame;
  size_t payload_length = creator_.max_packet_length();
  const std::string too_long_payload(payload_length, 'a');
  MakeIOVector(too_long_payload, &iov_);
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
      stream_id, &iov_, 1u, iov_.iov_len, 0u, 0u, true, false,
      NOT_RETRANSMISSION, &frame));
  size_t consumed = frame.stream_frame.data_length;
  // The entire payload could not be consumed.
  EXPECT_GT(payload_length, consumed);
  creator_.FlushCurrentPacket();
  DeleteSerializedPacket();
}

TEST_P(QuicPacketCreatorTest, AddFrameAndFlush) {
  if (!GetParam().version_serialization) {
    creator_.StopSendingVersion();
  }
  const size_t max_plaintext_size =
      client_framer_.GetMaxPlaintextSize(creator_.max_packet_length());
  EXPECT_FALSE(creator_.HasPendingFrames());
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    stream_id =
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version());
  }
  EXPECT_FALSE(creator_.HasPendingStreamFramesOfStream(stream_id));
  EXPECT_EQ(max_plaintext_size -
                GetPacketHeaderSize(
                    client_framer_.transport_version(),
                    creator_.GetDestinationConnectionIdLength(),
                    creator_.GetSourceConnectionIdLength(),
                    QuicPacketCreatorPeer::SendVersionInPacket(&creator_),
                    !kIncludeDiversificationNonce,
                    QuicPacketCreatorPeer::GetPacketNumberLength(&creator_),
                    QuicPacketCreatorPeer::GetRetryTokenLengthLength(&creator_),
                    0, QuicPacketCreatorPeer::GetLengthLength(&creator_)),
            creator_.BytesFree());
  StrictMock<MockDebugDelegate> debug;
  creator_.set_debug_delegate(&debug);

  // Add a variety of frame types and then a padding frame.
  QuicAckFrame ack_frame(InitAckFrame(10u));
  EXPECT_CALL(debug, OnFrameAddedToPacket(_));
  EXPECT_TRUE(
      creator_.AddSavedFrame(QuicFrame(&ack_frame), NOT_RETRANSMISSION));
  EXPECT_TRUE(creator_.HasPendingFrames());
  EXPECT_FALSE(creator_.HasPendingStreamFramesOfStream(stream_id));

  QuicFrame frame;
  MakeIOVector("test", &iov_);
  EXPECT_CALL(debug, OnFrameAddedToPacket(_));
  ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
      stream_id, &iov_, 1u, iov_.iov_len, 0u, 0u, false, false,
      NOT_RETRANSMISSION, &frame));
  size_t consumed = frame.stream_frame.data_length;
  EXPECT_EQ(4u, consumed);
  EXPECT_TRUE(creator_.HasPendingFrames());
  EXPECT_TRUE(creator_.HasPendingStreamFramesOfStream(stream_id));

  QuicPaddingFrame padding_frame;
  EXPECT_CALL(debug, OnFrameAddedToPacket(_));
  EXPECT_TRUE(
      creator_.AddSavedFrame(QuicFrame(padding_frame), NOT_RETRANSMISSION));
  EXPECT_TRUE(creator_.HasPendingFrames());
  EXPECT_EQ(0u, creator_.BytesFree());

  // Packet is full. Creator will flush.
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  EXPECT_FALSE(
      creator_.AddSavedFrame(QuicFrame(&ack_frame), NOT_RETRANSMISSION));

  // Ensure the packet is successfully created.
  ASSERT_TRUE(serialized_packet_.encrypted_buffer);
  ASSERT_FALSE(serialized_packet_.retransmittable_frames.empty());
  const QuicFrames& retransmittable = serialized_packet_.retransmittable_frames;
  ASSERT_EQ(1u, retransmittable.size());
  EXPECT_EQ(STREAM_FRAME, retransmittable[0].type);
  EXPECT_TRUE(serialized_packet_.has_ack);
  EXPECT_EQ(QuicPacketNumber(10u), serialized_packet_.largest_acked);
  DeleteSerializedPacket();

  EXPECT_FALSE(creator_.HasPendingFrames());
  EXPECT_FALSE(creator_.HasPendingStreamFramesOfStream(stream_id));
  EXPECT_EQ(max_plaintext_size -
                GetPacketHeaderSize(
                    client_framer_.transport_version(),
                    creator_.GetDestinationConnectionIdLength(),
                    creator_.GetSourceConnectionIdLength(),
                    QuicPacketCreatorPeer::SendVersionInPacket(&creator_),
                    !kIncludeDiversificationNonce,
                    QuicPacketCreatorPeer::GetPacketNumberLength(&creator_),
                    QuicPacketCreatorPeer::GetRetryTokenLengthLength(&creator_),
                    0, QuicPacketCreatorPeer::GetLengthLength(&creator_)),
            creator_.BytesFree());
}

TEST_P(QuicPacketCreatorTest, SerializeAndSendStreamFrame) {
  if (!GetParam().version_serialization) {
    creator_.StopSendingVersion();
  }
  EXPECT_FALSE(creator_.HasPendingFrames());

  MakeIOVector("test", &iov_);
  producer_.SaveStreamData(GetNthClientInitiatedStreamId(0), &iov_, 1u, 0u,
                           iov_.iov_len);
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  size_t num_bytes_consumed;
  StrictMock<MockDebugDelegate> debug;
  creator_.set_debug_delegate(&debug);
  EXPECT_CALL(debug, OnFrameAddedToPacket(_));
  creator_.CreateAndSerializeStreamFrame(
      GetNthClientInitiatedStreamId(0), iov_.iov_len, 0, 0, true,
      NOT_RETRANSMISSION, &num_bytes_consumed);
  EXPECT_EQ(4u, num_bytes_consumed);

  // Ensure the packet is successfully created.
  ASSERT_TRUE(serialized_packet_.encrypted_buffer);
  ASSERT_FALSE(serialized_packet_.retransmittable_frames.empty());
  const QuicFrames& retransmittable = serialized_packet_.retransmittable_frames;
  ASSERT_EQ(1u, retransmittable.size());
  EXPECT_EQ(STREAM_FRAME, retransmittable[0].type);
  DeleteSerializedPacket();

  EXPECT_FALSE(creator_.HasPendingFrames());
}

TEST_P(QuicPacketCreatorTest, SerializeStreamFrameWithPadding) {
  // Regression test to check that CreateAndSerializeStreamFrame uses a
  // correctly formatted stream frame header when appending padding.

  if (!GetParam().version_serialization) {
    creator_.StopSendingVersion();
  }
  EXPECT_FALSE(creator_.HasPendingFrames());

  // Send one byte of stream data.
  MakeIOVector("a", &iov_);
  producer_.SaveStreamData(GetNthClientInitiatedStreamId(0), &iov_, 1u, 0u,
                           iov_.iov_len);
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  size_t num_bytes_consumed;
  creator_.CreateAndSerializeStreamFrame(
      GetNthClientInitiatedStreamId(0), iov_.iov_len, 0, 0, true,
      NOT_RETRANSMISSION, &num_bytes_consumed);
  EXPECT_EQ(1u, num_bytes_consumed);

  // Check that a packet is created.
  ASSERT_TRUE(serialized_packet_.encrypted_buffer);
  ASSERT_FALSE(serialized_packet_.retransmittable_frames.empty());
  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
    EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    if (client_framer_.version().HasHeaderProtection()) {
      EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
    }
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized_packet_);
}

TEST_P(QuicPacketCreatorTest, AddUnencryptedStreamDataClosesConnection) {
  // EXPECT_QUIC_BUG tests are expensive so only run one instance of them.
  if (!IsDefaultTestConfiguration()) {
    return;
  }

  creator_.set_encryption_level(ENCRYPTION_INITIAL);
  EXPECT_CALL(delegate_, OnUnrecoverableError(_, _));
  QuicStreamFrame stream_frame(GetNthClientInitiatedStreamId(0),
                               /*fin=*/false, 0u, QuicStringPiece());
  EXPECT_QUIC_BUG(
      creator_.AddSavedFrame(QuicFrame(stream_frame), NOT_RETRANSMISSION),
      "Cannot send stream data with level: ENCRYPTION_INITIAL");
}

TEST_P(QuicPacketCreatorTest, SendStreamDataWithEncryptionHandshake) {
  // EXPECT_QUIC_BUG tests are expensive so only run one instance of them.
  if (!IsDefaultTestConfiguration()) {
    return;
  }

  creator_.set_encryption_level(ENCRYPTION_HANDSHAKE);
  EXPECT_CALL(delegate_, OnUnrecoverableError(_, _));
  QuicStreamFrame stream_frame(GetNthClientInitiatedStreamId(0),
                               /*fin=*/false, 0u, QuicStringPiece());
  EXPECT_QUIC_BUG(
      creator_.AddSavedFrame(QuicFrame(stream_frame), NOT_RETRANSMISSION),
      "Cannot send stream data with level: ENCRYPTION_HANDSHAKE");
}

TEST_P(QuicPacketCreatorTest, ChloTooLarge) {
  // EXPECT_QUIC_BUG tests are expensive so only run one instance of them.
  if (!IsDefaultTestConfiguration()) {
    return;
  }

  // This test only matters when the crypto handshake is sent in stream frames.
  // TODO(b/128596274): Re-enable when this check is supported for CRYPTO
  // frames.
  if (QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    return;
  }

  CryptoHandshakeMessage message;
  message.set_tag(kCHLO);
  message.set_minimum_size(kMaxOutgoingPacketSize);
  CryptoFramer framer;
  std::unique_ptr<QuicData> message_data;
  message_data = framer.ConstructHandshakeMessage(message);

  struct iovec iov;
  MakeIOVector(QuicStringPiece(message_data->data(), message_data->length()),
               &iov);
  QuicFrame frame;
  EXPECT_CALL(delegate_, OnUnrecoverableError(QUIC_CRYPTO_CHLO_TOO_LARGE, _));
  EXPECT_QUIC_BUG(
      creator_.ConsumeDataToFillCurrentPacket(
          QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
          &iov, 1u, iov.iov_len, 0u, 0u, false, false, NOT_RETRANSMISSION,
          &frame),
      "Client hello won't fit in a single packet.");
}

TEST_P(QuicPacketCreatorTest, PendingPadding) {
  EXPECT_EQ(0u, creator_.pending_padding_bytes());
  creator_.AddPendingPadding(kMaxNumRandomPaddingBytes * 10);
  EXPECT_EQ(kMaxNumRandomPaddingBytes * 10, creator_.pending_padding_bytes());

  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillRepeatedly(
          Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  // Flush all paddings.
  while (creator_.pending_padding_bytes() > 0) {
    creator_.FlushCurrentPacket();
    {
      InSequence s;
      EXPECT_CALL(framer_visitor_, OnPacket());
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
      EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
      EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
      EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
      EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
      EXPECT_CALL(framer_visitor_, OnPacketComplete());
    }
    // Packet only contains padding.
    ProcessPacket(serialized_packet_);
  }
  EXPECT_EQ(0u, creator_.pending_padding_bytes());
}

TEST_P(QuicPacketCreatorTest, FullPaddingDoesNotConsumePendingPadding) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  creator_.AddPendingPadding(kMaxNumRandomPaddingBytes);
  QuicFrame frame;
  MakeIOVector("test", &iov_);
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
      stream_id, &iov_, 1u, iov_.iov_len, 0u, 0u, false,
      /*needs_full_padding=*/true, NOT_RETRANSMISSION, &frame));
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  creator_.FlushCurrentPacket();
  EXPECT_EQ(kMaxNumRandomPaddingBytes, creator_.pending_padding_bytes());
}

TEST_P(QuicPacketCreatorTest, SendPendingPaddingInRetransmission) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  QuicStreamFrame stream_frame(stream_id,
                               /*fin=*/false, 0u, QuicStringPiece());
  QuicFrames frames;
  frames.push_back(QuicFrame(stream_frame));
  char buffer[kMaxOutgoingPacketSize];
  QuicPendingRetransmission retransmission(CreateRetransmission(
      frames, true, /*num_padding_bytes=*/0, ENCRYPTION_FORWARD_SECURE,
      QuicPacketCreatorPeer::GetPacketNumberLength(&creator_)));
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  creator_.AddPendingPadding(kMaxNumRandomPaddingBytes);
  creator_.ReserializeAllFrames(retransmission, buffer, kMaxOutgoingPacketSize);
  EXPECT_EQ(0u, creator_.pending_padding_bytes());
  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
    EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized_packet_);
}

TEST_P(QuicPacketCreatorTest, SendPacketAfterFullPaddingRetransmission) {
  // Making sure needs_full_padding gets reset after a full padding
  // retransmission.
  EXPECT_EQ(0u, creator_.pending_padding_bytes());
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  QuicFrame frame;
  std::string data = "fake handshake message data";
  MakeIOVector(data, &iov_);
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    stream_id =
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version());
  }
  producer_.SaveStreamData(stream_id, &iov_, 1u, 0u, iov_.iov_len);
  QuicPacketCreatorPeer::CreateStreamFrame(&creator_, stream_id, iov_.iov_len,
                                           0u, false, &frame);
  QuicFrames frames;
  frames.push_back(frame);
  char buffer[kMaxOutgoingPacketSize];
  QuicPendingRetransmission retransmission(CreateRetransmission(
      frames, true, /*num_padding_bytes=*/-1, ENCRYPTION_FORWARD_SECURE,
      QuicPacketCreatorPeer::GetPacketNumberLength(&creator_)));
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillRepeatedly(
          Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  creator_.ReserializeAllFrames(retransmission, buffer, kMaxOutgoingPacketSize);
  EXPECT_EQ(kDefaultMaxPacketSize, serialized_packet_.encrypted_length);
  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
    EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    // Full padding.
    EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized_packet_);

  creator_.ConsumeDataToFillCurrentPacket(stream_id, &iov_, 1u, iov_.iov_len,
                                          0u, 0u, false, false,
                                          NOT_RETRANSMISSION, &frame);
  creator_.FlushCurrentPacket();
  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
    EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    // needs_full_padding gets reset.
    EXPECT_CALL(framer_visitor_, OnPaddingFrame(_)).Times(0);
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized_packet_);
  DeleteFrames(&frames);
}

TEST_P(QuicPacketCreatorTest, ConsumeDataAndRandomPadding) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  const QuicByteCount kStreamFramePayloadSize = 100u;
  // Set the packet size be enough for one stream frame with 0 stream offset +
  // 1.
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  size_t length =
      GetPacketHeaderOverhead(client_framer_.transport_version()) +
      GetEncryptionOverhead() +
      QuicFramer::GetMinStreamFrameSize(
          client_framer_.transport_version(), stream_id, 0,
          /*last_frame_in_packet=*/false, kStreamFramePayloadSize + 1) +
      kStreamFramePayloadSize + 1;
  creator_.SetMaxPacketLength(length);
  creator_.AddPendingPadding(kMaxNumRandomPaddingBytes);
  QuicByteCount pending_padding_bytes = creator_.pending_padding_bytes();
  QuicFrame frame;
  char buf[kStreamFramePayloadSize + 1] = {};
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillRepeatedly(
          Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
  // Send stream frame of size kStreamFramePayloadSize.
  MakeIOVector(QuicStringPiece(buf, kStreamFramePayloadSize), &iov_);
  creator_.ConsumeDataToFillCurrentPacket(stream_id, &iov_, 1u, iov_.iov_len,
                                          0u, 0u, false, false,
                                          NOT_RETRANSMISSION, &frame);
  creator_.FlushCurrentPacket();
  // 1 byte padding is sent.
  EXPECT_EQ(pending_padding_bytes - 1, creator_.pending_padding_bytes());
  // Send stream frame of size kStreamFramePayloadSize + 1.
  MakeIOVector(QuicStringPiece(buf, kStreamFramePayloadSize + 1), &iov_);
  creator_.ConsumeDataToFillCurrentPacket(stream_id, &iov_, 1u, iov_.iov_len,
                                          0u, kStreamFramePayloadSize, false,
                                          false, NOT_RETRANSMISSION, &frame);
  // No padding is sent.
  creator_.FlushCurrentPacket();
  EXPECT_EQ(pending_padding_bytes - 1, creator_.pending_padding_bytes());
  // Flush all paddings.
  while (creator_.pending_padding_bytes() > 0) {
    creator_.FlushCurrentPacket();
  }
  EXPECT_EQ(0u, creator_.pending_padding_bytes());
}

TEST_P(QuicPacketCreatorTest, FlushWithExternalBuffer) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  char external_buffer[kMaxOutgoingPacketSize];
  char* expected_buffer = external_buffer;
  EXPECT_CALL(delegate_, GetPacketBuffer()).WillOnce(Return(expected_buffer));

  QuicFrame frame;
  MakeIOVector("test", &iov_);
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  ASSERT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
      stream_id, &iov_, 1u, iov_.iov_len, 0u, 0u, false,
      /*needs_full_padding=*/true, NOT_RETRANSMISSION, &frame));

  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke([expected_buffer](SerializedPacket* serialized_packet) {
        EXPECT_EQ(expected_buffer, serialized_packet->encrypted_buffer);
        ClearSerializedPacket(serialized_packet);
      }));
  creator_.FlushCurrentPacket();
}

// Test for error found in
// https://bugs.chromium.org/p/chromium/issues/detail?id=859949 where a gap
// length that crosses an IETF VarInt length boundary would cause a
// failure. While this test is not applicable to versions other than version 99,
// it should still work. Hence, it is not made version-specific.
TEST_P(QuicPacketCreatorTest, IetfAckGapErrorRegression) {
  QuicAckFrame ack_frame =
      InitAckFrame({{QuicPacketNumber(60), QuicPacketNumber(61)},
                    {QuicPacketNumber(125), QuicPacketNumber(126)}});
  frames_.push_back(QuicFrame(&ack_frame));
  SerializeAllFrames(frames_);
}

TEST_P(QuicPacketCreatorTest, AddMessageFrame) {
  if (!VersionSupportsMessageFrames(client_framer_.transport_version())) {
    return;
  }
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .Times(3)
      .WillRepeatedly(
          Invoke(this, &QuicPacketCreatorTest::ClearSerializedPacketForTests));
  QuicMemSliceStorage storage(nullptr, 0, nullptr, 0);
  // Verify that there is enough room for the largest message payload.
  EXPECT_TRUE(creator_.HasRoomForMessageFrame(
      creator_.GetCurrentLargestMessagePayload()));
  std::string message(creator_.GetCurrentLargestMessagePayload(), 'a');
  QuicMessageFrame* message_frame =
      new QuicMessageFrame(1, MakeSpan(&allocator_, message, &storage));
  EXPECT_TRUE(
      creator_.AddSavedFrame(QuicFrame(message_frame), NOT_RETRANSMISSION));
  EXPECT_TRUE(creator_.HasPendingFrames());
  creator_.FlushCurrentPacket();

  QuicMessageFrame* frame2 =
      new QuicMessageFrame(2, MakeSpan(&allocator_, "message", &storage));
  EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(frame2), NOT_RETRANSMISSION));
  EXPECT_TRUE(creator_.HasPendingFrames());
  // Verify if a new frame is added, 1 byte message length will be added.
  EXPECT_EQ(1u, creator_.ExpansionOnNewFrame());
  QuicMessageFrame* frame3 =
      new QuicMessageFrame(3, MakeSpan(&allocator_, "message2", &storage));
  EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(frame3), NOT_RETRANSMISSION));
  EXPECT_EQ(1u, creator_.ExpansionOnNewFrame());
  creator_.FlushCurrentPacket();

  QuicFrame frame;
  MakeIOVector("test", &iov_);
  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  EXPECT_TRUE(creator_.ConsumeDataToFillCurrentPacket(
      stream_id, &iov_, 1u, iov_.iov_len, 0u, 0u, false, false,
      NOT_RETRANSMISSION, &frame));
  QuicMessageFrame* frame4 =
      new QuicMessageFrame(4, MakeSpan(&allocator_, "message", &storage));
  EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(frame4), NOT_RETRANSMISSION));
  EXPECT_TRUE(creator_.HasPendingFrames());
  // Verify there is not enough room for largest payload.
  EXPECT_FALSE(creator_.HasRoomForMessageFrame(
      creator_.GetCurrentLargestMessagePayload()));
  // Add largest message will causes the flush of the stream frame.
  QuicMessageFrame frame5(5, MakeSpan(&allocator_, message, &storage));
  EXPECT_FALSE(creator_.AddSavedFrame(QuicFrame(&frame5), NOT_RETRANSMISSION));
  EXPECT_FALSE(creator_.HasPendingFrames());
}

TEST_P(QuicPacketCreatorTest, MessageFrameConsumption) {
  if (!VersionSupportsMessageFrames(client_framer_.transport_version())) {
    return;
  }
  std::string message_data(kDefaultMaxPacketSize, 'a');
  QuicStringPiece message_buffer(message_data);
  QuicMemSliceStorage storage(nullptr, 0, nullptr, 0);
  // Test all possible encryption levels of message frames.
  for (EncryptionLevel level :
       {ENCRYPTION_ZERO_RTT, ENCRYPTION_FORWARD_SECURE}) {
    creator_.set_encryption_level(level);
    // Test all possible sizes of message frames.
    for (size_t message_size = 0;
         message_size <= creator_.GetCurrentLargestMessagePayload();
         ++message_size) {
      QuicMessageFrame* frame = new QuicMessageFrame(
          0, MakeSpan(&allocator_,
                      QuicStringPiece(message_buffer.data(), message_size),
                      &storage));
      EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(frame), NOT_RETRANSMISSION));
      EXPECT_TRUE(creator_.HasPendingFrames());

      size_t expansion_bytes = message_size >= 64 ? 2 : 1;
      EXPECT_EQ(expansion_bytes, creator_.ExpansionOnNewFrame());
      // Verify BytesFree returns bytes available for the next frame, which
      // should subtract the message length.
      size_t expected_bytes_free =
          creator_.GetCurrentLargestMessagePayload() - message_size <
                  expansion_bytes
              ? 0
              : creator_.GetCurrentLargestMessagePayload() - expansion_bytes -
                    message_size;
      EXPECT_EQ(expected_bytes_free, creator_.BytesFree());
      EXPECT_LE(creator_.GetGuaranteedLargestMessagePayload(),
                creator_.GetCurrentLargestMessagePayload());
      EXPECT_CALL(delegate_, OnSerializedPacket(_))
          .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));
      creator_.FlushCurrentPacket();
      ASSERT_TRUE(serialized_packet_.encrypted_buffer);
      DeleteSerializedPacket();
    }
  }
}

// Regression test for bugfix of GetPacketHeaderSize.
TEST_P(QuicPacketCreatorTest, GetGuaranteedLargestMessagePayload) {
  QuicTransportVersion version = creator_.transport_version();
  if (!VersionSupportsMessageFrames(version)) {
    return;
  }
  QuicPacketLength expected_largest_payload = 1319;
  if (QuicVersionHasLongHeaderLengths(version)) {
    expected_largest_payload -= 2;
  }
  if (GetParam().version.HasLengthPrefixedConnectionIds()) {
    expected_largest_payload -= 1;
  }
  EXPECT_EQ(expected_largest_payload,
            creator_.GetGuaranteedLargestMessagePayload());
}

TEST_P(QuicPacketCreatorTest, PacketTransmissionType) {
  creator_.set_encryption_level(ENCRYPTION_FORWARD_SECURE);
  creator_.set_can_set_transmission_type(true);
  creator_.SetTransmissionTypeOfNextPackets(NOT_RETRANSMISSION);

  QuicAckFrame temp_ack_frame = InitAckFrame(1);
  QuicFrame ack_frame(&temp_ack_frame);
  ASSERT_FALSE(QuicUtils::IsRetransmittableFrame(ack_frame.type));

  QuicStreamId stream_id = QuicUtils::GetFirstBidirectionalStreamId(
      client_framer_.transport_version(), Perspective::IS_CLIENT);
  QuicFrame stream_frame(QuicStreamFrame(stream_id,
                                         /*fin=*/false, 0u, QuicStringPiece()));
  ASSERT_TRUE(QuicUtils::IsRetransmittableFrame(stream_frame.type));

  QuicFrame padding_frame{QuicPaddingFrame()};
  ASSERT_FALSE(QuicUtils::IsRetransmittableFrame(padding_frame.type));

  EXPECT_CALL(delegate_, OnSerializedPacket(_))
      .WillOnce(Invoke(this, &QuicPacketCreatorTest::SaveSerializedPacket));

  EXPECT_TRUE(creator_.AddSavedFrame(ack_frame, LOSS_RETRANSMISSION));
  ASSERT_FALSE(serialized_packet_.encrypted_buffer);

  EXPECT_TRUE(creator_.AddSavedFrame(stream_frame, RTO_RETRANSMISSION));
  ASSERT_FALSE(serialized_packet_.encrypted_buffer);

  EXPECT_TRUE(creator_.AddSavedFrame(padding_frame, TLP_RETRANSMISSION));
  creator_.FlushCurrentPacket();
  ASSERT_TRUE(serialized_packet_.encrypted_buffer);

  if (creator_.can_set_transmission_type()) {
    // The last retransmittable frame on packet is a stream frame, the packet's
    // transmission type should be the same as the stream frame's.
    EXPECT_EQ(serialized_packet_.transmission_type, RTO_RETRANSMISSION);
  } else {
    EXPECT_EQ(serialized_packet_.transmission_type, NOT_RETRANSMISSION);
  }
  DeleteSerializedPacket();
}

TEST_P(QuicPacketCreatorTest, RetryToken) {
  if (!GetParam().version_serialization ||
      !QuicVersionHasLongHeaderLengths(client_framer_.transport_version())) {
    return;
  }

  char retry_token_bytes[] = {1, 2,  3,  4,  5,  6,  7,  8,
                              9, 10, 11, 12, 13, 14, 15, 16};

  creator_.SetRetryToken(
      std::string(retry_token_bytes, sizeof(retry_token_bytes)));

  std::string data("a");
  if (!QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
    QuicStreamFrame stream_frame(
        QuicUtils::GetCryptoStreamId(client_framer_.transport_version()),
        /*fin=*/false, 0u, QuicStringPiece());
    frames_.push_back(QuicFrame(stream_frame));
  } else {
    producer_.SaveCryptoData(ENCRYPTION_INITIAL, 0, data);
    frames_.push_back(
        QuicFrame(new QuicCryptoFrame(ENCRYPTION_INITIAL, 0, data.length())));
  }
  SerializedPacket serialized = SerializeAllFrames(frames_);

  QuicPacketHeader header;
  {
    InSequence s;
    EXPECT_CALL(framer_visitor_, OnPacket());
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
    EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
    EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
    EXPECT_CALL(framer_visitor_, OnPacketHeader(_))
        .WillOnce(DoAll(SaveArg<0>(&header), Return(true)));
    if (QuicVersionUsesCryptoFrames(client_framer_.transport_version())) {
      EXPECT_CALL(framer_visitor_, OnCryptoFrame(_));
    } else {
      EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
    }
    if (client_framer_.version().HasHeaderProtection()) {
      EXPECT_CALL(framer_visitor_, OnPaddingFrame(_));
    }
    EXPECT_CALL(framer_visitor_, OnPacketComplete());
  }
  ProcessPacket(serialized);
  ASSERT_TRUE(header.version_flag);
  ASSERT_EQ(header.long_packet_type, INITIAL);
  ASSERT_EQ(header.retry_token.length(), sizeof(retry_token_bytes));
  test::CompareCharArraysWithHexError(
      "retry token", header.retry_token.data(), header.retry_token.length(),
      retry_token_bytes, sizeof(retry_token_bytes));
  DeleteFrames(&frames_);
}

TEST_P(QuicPacketCreatorTest, GetConnectionId) {
  EXPECT_EQ(TestConnectionId(2), creator_.GetDestinationConnectionId());
  EXPECT_EQ(EmptyQuicConnectionId(), creator_.GetSourceConnectionId());
}

TEST_P(QuicPacketCreatorTest, ClientConnectionId) {
  if (!client_framer_.version().SupportsClientConnectionIds()) {
    return;
  }
  EXPECT_EQ(TestConnectionId(2), creator_.GetDestinationConnectionId());
  EXPECT_EQ(EmptyQuicConnectionId(), creator_.GetSourceConnectionId());
  creator_.SetClientConnectionId(TestConnectionId(0x33));
  EXPECT_EQ(TestConnectionId(2), creator_.GetDestinationConnectionId());
  EXPECT_EQ(TestConnectionId(0x33), creator_.GetSourceConnectionId());
}

}  // namespace
}  // namespace test
}  // namespace quic