net/quic/quic_packet_creator_test.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/quic/quic_packet_creator.h"
   6
   7 #include "base/stl_util.h"
   8 #include "net/quic/crypto/null_encrypter.h"
   9 #include "net/quic/crypto/quic_decrypter.h"
  10 #include "net/quic/crypto/quic_encrypter.h"
  11 #include "net/quic/quic_utils.h"
  12 #include "net/quic/test_tools/mock_random.h"
  13 #include "net/quic/test_tools/quic_framer_peer.h"
  14 #include "net/quic/test_tools/quic_packet_creator_peer.h"
  15 #include "net/quic/test_tools/quic_test_utils.h"
  16 #include "net/test/gtest_util.h"
  17 #include "testing/gmock/include/gmock/gmock.h"
  18
  19 using base::StringPiece;
  20 using std::ostream;
  21 using std::string;
  22 using std::vector;
  23 using testing::DoAll;
  24 using testing::InSequence;
  25 using testing::Return;
  26 using testing::SaveArg;
  27 using testing::_;
  28
  29 namespace net {
  30 namespace test {
  31 namespace {
  32
  33 // Run tests with combinations of {QuicVersion, ToggleVersionSerialization}.
  34 struct TestParams {
  35   TestParams(QuicVersion version,
  36              bool version_serialization)
  37       : version(version),
  38         version_serialization(version_serialization) {
  39   }
  40
  41   friend ostream& operator<<(ostream& os, const TestParams& p) {
  42     os << "{ client_version: " << QuicVersionToString(p.version)
  43        << " include version: " << p.version_serialization << " }";
  44     return os;
  45   }
  46
  47   QuicVersion version;
  48   bool version_serialization;
  49 };
  50
  51 // Constructs various test permutations.
  52 vector<TestParams> GetTestParams() {
  53   vector<TestParams> params;
  54   QuicVersionVector all_supported_versions = QuicSupportedVersions();
  55   for (size_t i = 0; i < all_supported_versions.size(); ++i) {
  56     params.push_back(TestParams(all_supported_versions[i], true));
  57     params.push_back(TestParams(all_supported_versions[i], false));
  58   }
  59   return params;
  60 }
  61
  62 class QuicPacketCreatorTest : public ::testing::TestWithParam<TestParams> {
  63  protected:
  64   QuicPacketCreatorTest()
  65       : server_framer_(SupportedVersions(GetParam().version), QuicTime::Zero(),
  66                        true),
  67         client_framer_(SupportedVersions(GetParam().version), QuicTime::Zero(),
  68                        false),
  69         sequence_number_(0),
  70         connection_id_(2),
  71         data_("foo"),
  72         creator_(connection_id_, &client_framer_, &mock_random_) {
  73     client_framer_.set_visitor(&framer_visitor_);
  74     client_framer_.set_received_entropy_calculator(&entropy_calculator_);
  75     server_framer_.set_visitor(&framer_visitor_);
  76   }
  77
  78   virtual ~QuicPacketCreatorTest() OVERRIDE {
  79   }
  80
  81   void ProcessPacket(QuicPacket* packet) {
  82     scoped_ptr<QuicEncryptedPacket> encrypted(
  83         server_framer_.EncryptPacket(ENCRYPTION_NONE, sequence_number_,
  84                                      *packet));
  85     server_framer_.ProcessPacket(*encrypted);
  86   }
  87
  88   void CheckStreamFrame(const QuicFrame& frame,
  89                         QuicStreamId stream_id,
  90                         const string& data,
  91                         QuicStreamOffset offset,
  92                         bool fin) {
  93     EXPECT_EQ(STREAM_FRAME, frame.type);
  94     ASSERT_TRUE(frame.stream_frame);
  95     EXPECT_EQ(stream_id, frame.stream_frame->stream_id);
  96     scoped_ptr<string> frame_data(frame.stream_frame->GetDataAsString());
  97     EXPECT_EQ(data, *frame_data);
  98     EXPECT_EQ(offset, frame.stream_frame->offset);
  99     EXPECT_EQ(fin, frame.stream_frame->fin);
 100   }
 101
 102   // Returns the number of bytes consumed by the header of packet, including
 103   // the version.
 104   size_t GetPacketHeaderOverhead(InFecGroup is_in_fec_group) {
 105     return GetPacketHeaderSize(creator_.connection_id_length(),
 106                                kIncludeVersion,
 107                                creator_.next_sequence_number_length(),
 108                                is_in_fec_group);
 109   }
 110
 111   // Returns the number of bytes of overhead that will be added to a packet
 112   // of maximum length.
 113   size_t GetEncryptionOverhead() {
 114     return creator_.max_packet_length() - client_framer_.GetMaxPlaintextSize(
 115         creator_.max_packet_length());
 116   }
 117
 118   // Returns the number of bytes consumed by the non-data fields of a stream
 119   // frame, assuming it is the last frame in the packet
 120   size_t GetStreamFrameOverhead(InFecGroup is_in_fec_group) {
 121     return QuicFramer::GetMinStreamFrameSize(kClientDataStreamId1, kOffset,
 122                                              true, is_in_fec_group);
 123   }
 124
 125   // Enables and turns on FEC protection. Returns true if FEC protection is on.
 126   bool SwitchFecProtectionOn(size_t max_packets_per_fec_group) {
 127     creator_.set_max_packets_per_fec_group(max_packets_per_fec_group);
 128     creator_.StartFecProtectingPackets();
 129     return creator_.IsFecProtected();
 130   }
 131
 132   static const QuicStreamOffset kOffset = 1u;
 133
 134   QuicFrames frames_;
 135   QuicFramer server_framer_;
 136   QuicFramer client_framer_;
 137   testing::StrictMock<MockFramerVisitor> framer_visitor_;
 138   QuicPacketSequenceNumber sequence_number_;
 139   QuicConnectionId connection_id_;
 140   string data_;
 141   MockRandom mock_random_;
 142   QuicPacketCreator creator_;
 143   MockEntropyCalculator entropy_calculator_;
 144 };
 145
 146 // Run all packet creator tests with all supported versions of QUIC, and with
 147 // and without version in the packet header.
 148 INSTANTIATE_TEST_CASE_P(QuicPacketCreatorTests,
 149                         QuicPacketCreatorTest,
 150                         ::testing::ValuesIn(GetTestParams()));
 151
 152 TEST_P(QuicPacketCreatorTest, SerializeFrames) {
 153   frames_.push_back(QuicFrame(new QuicAckFrame(MakeAckFrame(0u))));
 154   frames_.push_back(QuicFrame(new QuicStreamFrame(0u, false, 0u, IOVector())));
 155   frames_.push_back(QuicFrame(new QuicStreamFrame(0u, true, 0u, IOVector())));
 156   SerializedPacket serialized = creator_.SerializeAllFrames(frames_);
 157   delete frames_[0].ack_frame;
 158   delete frames_[1].stream_frame;
 159   delete frames_[2].stream_frame;
 160
 161   {
 162     InSequence s;
 163     EXPECT_CALL(framer_visitor_, OnPacket());
 164     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 165     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 166     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 167     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 168     EXPECT_CALL(framer_visitor_, OnAckFrame(_));
 169     EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
 170     EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
 171     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 172   }
 173   ProcessPacket(serialized.packet);
 174   delete serialized.packet;
 175 }
 176
 177 TEST_P(QuicPacketCreatorTest, SerializeWithFEC) {
 178   // Enable FEC protection, and send FEC packet every 6 packets.
 179   EXPECT_TRUE(SwitchFecProtectionOn(6));
 180   // Should return false since we do not have enough packets in the FEC group to
 181   // trigger an FEC packet.
 182   ASSERT_FALSE(creator_.ShouldSendFec(/*force_close=*/false));
 183
 184   frames_.push_back(QuicFrame(new QuicStreamFrame(0u, false, 0u, IOVector())));
 185   SerializedPacket serialized = creator_.SerializeAllFrames(frames_);
 186   delete frames_[0].stream_frame;
 187
 188   {
 189     InSequence s;
 190     EXPECT_CALL(framer_visitor_, OnPacket());
 191     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 192     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 193     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 194     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 195     EXPECT_CALL(framer_visitor_, OnFecProtectedPayload(_));
 196     EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
 197     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 198   }
 199   ProcessPacket(serialized.packet);
 200   delete serialized.packet;
 201
 202   // Should return false since we do not have enough packets in the FEC group to
 203   // trigger an FEC packet.
 204   ASSERT_FALSE(creator_.ShouldSendFec(/*force_close=*/false));
 205   // Should return true since there are packets in the FEC group.
 206   ASSERT_TRUE(creator_.ShouldSendFec(/*force_close=*/true));
 207
 208   serialized = creator_.SerializeFec();
 209   ASSERT_EQ(2u, serialized.sequence_number);
 210   {
 211     InSequence s;
 212     EXPECT_CALL(framer_visitor_, OnPacket());
 213     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 214     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 215     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 216     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 217     EXPECT_CALL(framer_visitor_, OnFecData(_));
 218     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 219   }
 220   ProcessPacket(serialized.packet);
 221   delete serialized.packet;
 222 }
 223
 224 TEST_P(QuicPacketCreatorTest, SerializeChangingSequenceNumberLength) {
 225   frames_.push_back(QuicFrame(new QuicAckFrame(MakeAckFrame(0u))));
 226   creator_.AddSavedFrame(frames_[0]);
 227   creator_.set_next_sequence_number_length(PACKET_4BYTE_SEQUENCE_NUMBER);
 228   SerializedPacket serialized = creator_.SerializePacket();
 229   // The sequence number length will not change mid-packet.
 230   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 231
 232   {
 233     InSequence s;
 234     EXPECT_CALL(framer_visitor_, OnPacket());
 235     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 236     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 237     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 238     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 239     EXPECT_CALL(framer_visitor_, OnAckFrame(_));
 240     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 241   }
 242   ProcessPacket(serialized.packet);
 243   delete serialized.packet;
 244
 245   creator_.AddSavedFrame(frames_[0]);
 246   serialized = creator_.SerializePacket();
 247   // Now the actual sequence number length should have changed.
 248   EXPECT_EQ(PACKET_4BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 249   delete frames_[0].ack_frame;
 250
 251   {
 252     InSequence s;
 253     EXPECT_CALL(framer_visitor_, OnPacket());
 254     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 255     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 256     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 257     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 258     EXPECT_CALL(framer_visitor_, OnAckFrame(_));
 259     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 260   }
 261   ProcessPacket(serialized.packet);
 262   delete serialized.packet;
 263 }
 264
 265 TEST_P(QuicPacketCreatorTest, ChangeSequenceNumberLengthMidPacket) {
 266   // Changing the sequence number length with queued frames in the creator
 267   // should hold the change until after any currently queued frames are
 268   // serialized.
 269
 270   // Packet 1.
 271   // Queue a frame in the creator.
 272   EXPECT_FALSE(creator_.HasPendingFrames());
 273   QuicFrame ack_frame = QuicFrame(new QuicAckFrame(MakeAckFrame(0u)));
 274   creator_.AddSavedFrame(ack_frame);
 275
 276   // Now change sequence number length.
 277   creator_.set_next_sequence_number_length(PACKET_4BYTE_SEQUENCE_NUMBER);
 278
 279   // Add a STOP_WAITING frame since it contains a packet sequence number,
 280   // whose length should be 1.
 281   QuicStopWaitingFrame stop_waiting_frame;
 282   EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(&stop_waiting_frame)));
 283   EXPECT_TRUE(creator_.HasPendingFrames());
 284
 285   // Ensure the packet is successfully created.
 286   SerializedPacket serialized = creator_.SerializePacket();
 287   ASSERT_TRUE(serialized.packet);
 288   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 289
 290   // Verify that header in transmitted packet has 1 byte sequence length.
 291   QuicPacketHeader header;
 292   {
 293     InSequence s;
 294     EXPECT_CALL(framer_visitor_, OnPacket());
 295     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 296     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 297     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 298     EXPECT_CALL(framer_visitor_, OnPacketHeader(_)).WillOnce(
 299         DoAll(SaveArg<0>(&header), Return(true)));
 300     EXPECT_CALL(framer_visitor_, OnAckFrame(_));
 301     EXPECT_CALL(framer_visitor_, OnStopWaitingFrame(_));
 302     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 303   }
 304   ProcessPacket(serialized.packet);
 305   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER,
 306             header.public_header.sequence_number_length);
 307   delete serialized.packet;
 308
 309   // Packet 2.
 310   EXPECT_FALSE(creator_.HasPendingFrames());
 311   // Generate Packet 2 with one frame -- sequence number length should now
 312   // change to 4 bytes.
 313   EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(&stop_waiting_frame)));
 314   EXPECT_TRUE(creator_.HasPendingFrames());
 315
 316   // Ensure the packet is successfully created.
 317   serialized = creator_.SerializePacket();
 318   ASSERT_TRUE(serialized.packet);
 319   EXPECT_EQ(PACKET_4BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 320
 321   // Verify that header in transmitted packet has 4 byte sequence length.
 322   {
 323     InSequence s;
 324     EXPECT_CALL(framer_visitor_, OnPacket());
 325     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 326     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 327     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 328     EXPECT_CALL(framer_visitor_, OnPacketHeader(_)).WillOnce(
 329         DoAll(SaveArg<0>(&header), Return(true)));
 330     EXPECT_CALL(framer_visitor_, OnStopWaitingFrame(_));
 331     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 332   }
 333   ProcessPacket(serialized.packet);
 334   EXPECT_EQ(PACKET_4BYTE_SEQUENCE_NUMBER,
 335             header.public_header.sequence_number_length);
 336
 337   delete serialized.packet;
 338   delete ack_frame.ack_frame;
 339 }
 340
 341 TEST_P(QuicPacketCreatorTest, SerializeWithFECChangingSequenceNumberLength) {
 342   // Test goal is to test the following sequence (P1 => generate Packet 1):
 343   // P1 <change seq num length> P2 FEC,
 344   // and we expect that sequence number length should not change until the end
 345   // of the open FEC group.
 346
 347   // Enable FEC protection, and send FEC packet every 6 packets.
 348   EXPECT_TRUE(SwitchFecProtectionOn(6));
 349   // Should return false since we do not have enough packets in the FEC group to
 350   // trigger an FEC packet.
 351   ASSERT_FALSE(creator_.ShouldSendFec(/*force_close=*/false));
 352   frames_.push_back(QuicFrame(new QuicAckFrame(MakeAckFrame(0u))));
 353
 354   // Generate Packet 1.
 355   creator_.AddSavedFrame(frames_[0]);
 356   // Change the sequence number length mid-FEC group and it should not change.
 357   creator_.set_next_sequence_number_length(PACKET_4BYTE_SEQUENCE_NUMBER);
 358   SerializedPacket serialized = creator_.SerializePacket();
 359   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 360
 361   {
 362     InSequence s;
 363     EXPECT_CALL(framer_visitor_, OnPacket());
 364     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 365     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 366     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 367     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 368     EXPECT_CALL(framer_visitor_, OnFecProtectedPayload(_));
 369     EXPECT_CALL(framer_visitor_, OnAckFrame(_));
 370     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 371   }
 372   ProcessPacket(serialized.packet);
 373   delete serialized.packet;
 374
 375   // Generate Packet 2.
 376   creator_.AddSavedFrame(frames_[0]);
 377   serialized = creator_.SerializePacket();
 378   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 379
 380   {
 381     InSequence s;
 382     EXPECT_CALL(framer_visitor_, OnPacket());
 383     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 384     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 385     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 386     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 387     EXPECT_CALL(framer_visitor_, OnFecProtectedPayload(_));
 388     EXPECT_CALL(framer_visitor_, OnAckFrame(_));
 389     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 390   }
 391   ProcessPacket(serialized.packet);
 392   delete serialized.packet;
 393
 394   // Should return false since we do not have enough packets in the FEC group to
 395   // trigger an FEC packet.
 396   ASSERT_FALSE(creator_.ShouldSendFec(/*force_close=*/false));
 397   // Should return true since there are packets in the FEC group.
 398   ASSERT_TRUE(creator_.ShouldSendFec(/*force_close=*/true));
 399
 400   // Force generation of FEC packet.
 401   serialized = creator_.SerializeFec();
 402   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 403   ASSERT_EQ(3u, serialized.sequence_number);
 404
 405   {
 406     InSequence s;
 407     EXPECT_CALL(framer_visitor_, OnPacket());
 408     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 409     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 410     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 411     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 412     EXPECT_CALL(framer_visitor_, OnFecData(_));
 413     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 414   }
 415   ProcessPacket(serialized.packet);
 416   delete serialized.packet;
 417
 418   // Ensure the next FEC group starts using the new sequence number length.
 419   serialized = creator_.SerializeAllFrames(frames_);
 420   EXPECT_EQ(PACKET_4BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 421   delete frames_[0].ack_frame;
 422   delete serialized.packet;
 423 }
 424
 425 TEST_P(QuicPacketCreatorTest, ReserializeFramesWithSequenceNumberLength) {
 426   // If the original packet sequence number length, the current sequence number
 427   // length, and the configured send sequence number length are different, the
 428   // retransmit must sent with the original length and the others do not change.
 429   creator_.set_next_sequence_number_length(PACKET_4BYTE_SEQUENCE_NUMBER);
 430   QuicPacketCreatorPeer::SetSequenceNumberLength(&creator_,
 431                                                  PACKET_2BYTE_SEQUENCE_NUMBER);
 432   frames_.push_back(QuicFrame(new QuicStreamFrame(0u, false, 0u, IOVector())));
 433   SerializedPacket serialized =
 434       creator_.ReserializeAllFrames(frames_, PACKET_1BYTE_SEQUENCE_NUMBER);
 435   EXPECT_EQ(PACKET_4BYTE_SEQUENCE_NUMBER,
 436             creator_.next_sequence_number_length());
 437   EXPECT_EQ(PACKET_2BYTE_SEQUENCE_NUMBER,
 438             QuicPacketCreatorPeer::GetSequenceNumberLength(&creator_));
 439   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER, serialized.sequence_number_length);
 440   delete frames_[0].stream_frame;
 441
 442   {
 443     InSequence s;
 444     EXPECT_CALL(framer_visitor_, OnPacket());
 445     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 446     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 447     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 448     EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 449     EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
 450     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 451   }
 452   ProcessPacket(serialized.packet);
 453   delete serialized.packet;
 454 }
 455
 456 TEST_P(QuicPacketCreatorTest, SerializeConnectionClose) {
 457   QuicConnectionCloseFrame frame;
 458   frame.error_code = QUIC_NO_ERROR;
 459   frame.error_details = "error";
 460
 461   SerializedPacket serialized = creator_.SerializeConnectionClose(&frame);
 462   ASSERT_EQ(1u, serialized.sequence_number);
 463   ASSERT_EQ(1u, creator_.sequence_number());
 464
 465   InSequence s;
 466   EXPECT_CALL(framer_visitor_, OnPacket());
 467   EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 468   EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 469   EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 470   EXPECT_CALL(framer_visitor_, OnPacketHeader(_));
 471   EXPECT_CALL(framer_visitor_, OnConnectionCloseFrame(_));
 472   EXPECT_CALL(framer_visitor_, OnPacketComplete());
 473
 474   ProcessPacket(serialized.packet);
 475   delete serialized.packet;
 476 }
 477
 478 TEST_P(QuicPacketCreatorTest, SwitchFecOnOffWithNoGroup) {
 479   // Enable FEC protection.
 480   creator_.set_max_packets_per_fec_group(6);
 481   EXPECT_TRUE(creator_.IsFecEnabled());
 482   EXPECT_FALSE(creator_.IsFecProtected());
 483
 484   // Turn on FEC protection.
 485   creator_.StartFecProtectingPackets();
 486   EXPECT_TRUE(creator_.IsFecProtected());
 487   // We have no packets in the FEC group, so no FEC packet can be created.
 488   EXPECT_FALSE(creator_.ShouldSendFec(/*force_close=*/true));
 489   // Since no packets are in FEC group yet, we should be able to turn FEC
 490   // off with no trouble.
 491   creator_.StopFecProtectingPackets();
 492   EXPECT_FALSE(creator_.IsFecProtected());
 493 }
 494
 495 TEST_P(QuicPacketCreatorTest, SwitchFecOnOffWithGroupInProgress) {
 496   // Enable FEC protection, and send FEC packet every 6 packets.
 497   EXPECT_TRUE(SwitchFecProtectionOn(6));
 498   frames_.push_back(QuicFrame(new QuicStreamFrame(0u, false, 0u, IOVector())));
 499   SerializedPacket serialized = creator_.SerializeAllFrames(frames_);
 500   delete frames_[0].stream_frame;
 501   delete serialized.packet;
 502
 503   EXPECT_TRUE(creator_.IsFecProtected());
 504   // We do not have enough packets in the FEC group to trigger an FEC packet.
 505   EXPECT_FALSE(creator_.ShouldSendFec(/*force_close=*/false));
 506   // Should return true since there are packets in the FEC group.
 507   EXPECT_TRUE(creator_.ShouldSendFec(/*force_close=*/true));
 508
 509   // Switching FEC off should not change creator state, since there is an
 510   // FEC packet under construction.
 511   EXPECT_DFATAL(creator_.StopFecProtectingPackets(),
 512                 "Cannot stop FEC protection with open FEC group.");
 513   EXPECT_TRUE(creator_.IsFecProtected());
 514   // Confirm that FEC packet is still under construction.
 515   EXPECT_TRUE(creator_.ShouldSendFec(/*force_close=*/true));
 516
 517   serialized = creator_.SerializeFec();
 518   delete serialized.packet;
 519
 520   // Switching FEC on/off should work now.
 521   creator_.StopFecProtectingPackets();
 522   EXPECT_FALSE(creator_.IsFecProtected());
 523   creator_.StartFecProtectingPackets();
 524   EXPECT_TRUE(creator_.IsFecProtected());
 525 }
 526
 527 TEST_P(QuicPacketCreatorTest, SwitchFecOnWithStreamFrameQueued) {
 528   // Add a stream frame to the creator.
 529   QuicFrame frame;
 530   size_t consumed = creator_.CreateStreamFrame(
 531       1u, MakeIOVector("test"), 0u, false, &frame);
 532   EXPECT_EQ(4u, consumed);
 533   ASSERT_TRUE(frame.stream_frame);
 534   EXPECT_TRUE(creator_.AddSavedFrame(frame));
 535   EXPECT_TRUE(creator_.HasPendingFrames());
 536
 537   // Enable FEC protection, and send FEC packet every 6 packets.
 538   creator_.set_max_packets_per_fec_group(6);
 539   EXPECT_TRUE(creator_.IsFecEnabled());
 540   EXPECT_DFATAL(creator_.StartFecProtectingPackets(),
 541                 "Cannot start FEC protection with pending frames.");
 542   EXPECT_FALSE(creator_.IsFecProtected());
 543
 544   // Serialize packet for transmission.
 545   SerializedPacket serialized = creator_.SerializePacket();
 546   delete serialized.packet;
 547   delete serialized.retransmittable_frames;
 548   EXPECT_FALSE(creator_.HasPendingFrames());
 549
 550   // Since all pending frames have been serialized, turning FEC on should work.
 551   creator_.StartFecProtectingPackets();
 552   EXPECT_TRUE(creator_.IsFecProtected());
 553 }
 554
 555 TEST_P(QuicPacketCreatorTest, CreateStreamFrame) {
 556   QuicFrame frame;
 557   size_t consumed = creator_.CreateStreamFrame(1u, MakeIOVector("test"), 0u,
 558                                                false, &frame);
 559   EXPECT_EQ(4u, consumed);
 560   CheckStreamFrame(frame, 1u, "test", 0u, false);
 561   delete frame.stream_frame;
 562 }
 563
 564 TEST_P(QuicPacketCreatorTest, CreateStreamFrameFin) {
 565   QuicFrame frame;
 566   size_t consumed = creator_.CreateStreamFrame(1u, MakeIOVector("test"), 10u,
 567                                                true, &frame);
 568   EXPECT_EQ(4u, consumed);
 569   CheckStreamFrame(frame, 1u, "test", 10u, true);
 570   delete frame.stream_frame;
 571 }
 572
 573 TEST_P(QuicPacketCreatorTest, CreateStreamFrameFinOnly) {
 574   QuicFrame frame;
 575   size_t consumed = creator_.CreateStreamFrame(1u, IOVector(), 0u, true,
 576                                                &frame);
 577   EXPECT_EQ(0u, consumed);
 578   CheckStreamFrame(frame, 1u, string(), 0u, true);
 579   delete frame.stream_frame;
 580 }
 581
 582 TEST_P(QuicPacketCreatorTest, CreateAllFreeBytesForStreamFrames) {
 583   const size_t overhead = GetPacketHeaderOverhead(NOT_IN_FEC_GROUP)
 584                           + GetEncryptionOverhead();
 585   for (size_t i = overhead; i < overhead + 100; ++i) {
 586     creator_.set_max_packet_length(i);
 587     const bool should_have_room = i > overhead + GetStreamFrameOverhead(
 588         NOT_IN_FEC_GROUP);
 589     ASSERT_EQ(should_have_room, creator_.HasRoomForStreamFrame(
 590                                     kClientDataStreamId1, kOffset));
 591     if (should_have_room) {
 592       QuicFrame frame;
 593       size_t bytes_consumed = creator_.CreateStreamFrame(
 594           kClientDataStreamId1, MakeIOVector("testdata"), kOffset, false,
 595           &frame);
 596       EXPECT_LT(0u, bytes_consumed);
 597       ASSERT_TRUE(creator_.AddSavedFrame(frame));
 598       SerializedPacket serialized_packet = creator_.SerializePacket();
 599       ASSERT_TRUE(serialized_packet.packet);
 600       delete serialized_packet.packet;
 601       delete serialized_packet.retransmittable_frames;
 602     }
 603   }
 604 }
 605
 606 TEST_P(QuicPacketCreatorTest, StreamFrameConsumption) {
 607   // Compute the total overhead for a single frame in packet.
 608   const size_t overhead = GetPacketHeaderOverhead(NOT_IN_FEC_GROUP)
 609       + GetEncryptionOverhead() + GetStreamFrameOverhead(NOT_IN_FEC_GROUP);
 610   size_t capacity = kDefaultMaxPacketSize - overhead;
 611   // Now, test various sizes around this size.
 612   for (int delta = -5; delta <= 5; ++delta) {
 613     string data(capacity + delta, 'A');
 614     size_t bytes_free = delta > 0 ? 0 : 0 - delta;
 615     QuicFrame frame;
 616     size_t bytes_consumed = creator_.CreateStreamFrame(
 617         kClientDataStreamId1, MakeIOVector(data), kOffset, false, &frame);
 618     EXPECT_EQ(capacity - bytes_free, bytes_consumed);
 619
 620     ASSERT_TRUE(creator_.AddSavedFrame(frame));
 621     // BytesFree() returns bytes available for the next frame, which will
 622     // be two bytes smaller since the stream frame would need to be grown.
 623     EXPECT_EQ(2u, creator_.ExpansionOnNewFrame());
 624     size_t expected_bytes_free = bytes_free < 3 ? 0 : bytes_free - 2;
 625     EXPECT_EQ(expected_bytes_free, creator_.BytesFree()) << "delta: " << delta;
 626     SerializedPacket serialized_packet = creator_.SerializePacket();
 627     ASSERT_TRUE(serialized_packet.packet);
 628     delete serialized_packet.packet;
 629     delete serialized_packet.retransmittable_frames;
 630   }
 631 }
 632
 633 TEST_P(QuicPacketCreatorTest, StreamFrameConsumptionWithFec) {
 634   // Enable FEC protection, and send FEC packet every 6 packets.
 635   EXPECT_TRUE(SwitchFecProtectionOn(6));
 636   // Compute the total overhead for a single frame in packet.
 637   const size_t overhead = GetPacketHeaderOverhead(IN_FEC_GROUP)
 638       + GetEncryptionOverhead() + GetStreamFrameOverhead(IN_FEC_GROUP);
 639   size_t capacity = kDefaultMaxPacketSize - overhead;
 640   // Now, test various sizes around this size.
 641   for (int delta = -5; delta <= 5; ++delta) {
 642     string data(capacity + delta, 'A');
 643     size_t bytes_free = delta > 0 ? 0 : 0 - delta;
 644     QuicFrame frame;
 645     size_t bytes_consumed = creator_.CreateStreamFrame(
 646         kClientDataStreamId1, MakeIOVector(data), kOffset, false, &frame);
 647     EXPECT_EQ(capacity - bytes_free, bytes_consumed);
 648
 649     ASSERT_TRUE(creator_.AddSavedFrame(frame));
 650     // BytesFree() returns bytes available for the next frame. Since stream
 651     // frame does not grow for FEC protected packets, this should be the same
 652     // as bytes_free (bound by 0).
 653     EXPECT_EQ(0u, creator_.ExpansionOnNewFrame());
 654     size_t expected_bytes_free = bytes_free > 0 ? bytes_free : 0;
 655     EXPECT_EQ(expected_bytes_free, creator_.BytesFree()) << "delta: " << delta;
 656     SerializedPacket serialized_packet = creator_.SerializePacket();
 657     ASSERT_TRUE(serialized_packet.packet);
 658     delete serialized_packet.packet;
 659     delete serialized_packet.retransmittable_frames;
 660   }
 661 }
 662
 663 TEST_P(QuicPacketCreatorTest, CryptoStreamFramePacketPadding) {
 664   // Compute the total overhead for a single frame in packet.
 665   const size_t overhead = GetPacketHeaderOverhead(NOT_IN_FEC_GROUP)
 666       + GetEncryptionOverhead() + GetStreamFrameOverhead(NOT_IN_FEC_GROUP);
 667   ASSERT_GT(kMaxPacketSize, overhead);
 668   size_t capacity = kDefaultMaxPacketSize - overhead;
 669   // Now, test various sizes around this size.
 670   for (int delta = -5; delta <= 5; ++delta) {
 671     string data(capacity + delta, 'A');
 672     size_t bytes_free = delta > 0 ? 0 : 0 - delta;
 673
 674     QuicFrame frame;
 675     size_t bytes_consumed = creator_.CreateStreamFrame(
 676         kCryptoStreamId, MakeIOVector(data), kOffset, false, &frame);
 677     EXPECT_LT(0u, bytes_consumed);
 678     ASSERT_TRUE(creator_.AddSavedFrame(frame));
 679     SerializedPacket serialized_packet = creator_.SerializePacket();
 680     ASSERT_TRUE(serialized_packet.packet);
 681     // If there is not enough space in the packet to fit a padding frame
 682     // (1 byte) and to expand the stream frame (another 2 bytes) the packet
 683     // will not be padded.
 684     if (bytes_free < 3) {
 685       EXPECT_EQ(client_framer_.GetMaxPlaintextSize(kDefaultMaxPacketSize)
 686                 - bytes_free, serialized_packet.packet->length());
 687     } else {
 688       EXPECT_EQ(client_framer_.GetMaxPlaintextSize(kDefaultMaxPacketSize),
 689                 serialized_packet.packet->length());
 690     }
 691     delete serialized_packet.packet;
 692     delete serialized_packet.retransmittable_frames;
 693   }
 694 }
 695
 696 TEST_P(QuicPacketCreatorTest, NonCryptoStreamFramePacketNonPadding) {
 697   // Compute the total overhead for a single frame in packet.
 698   const size_t overhead = GetPacketHeaderOverhead(NOT_IN_FEC_GROUP)
 699       + GetEncryptionOverhead() + GetStreamFrameOverhead(NOT_IN_FEC_GROUP);
 700   ASSERT_GT(kDefaultMaxPacketSize, overhead);
 701   size_t capacity = kDefaultMaxPacketSize - overhead;
 702   // Now, test various sizes around this size.
 703   for (int delta = -5; delta <= 5; ++delta) {
 704     string data(capacity + delta, 'A');
 705     size_t bytes_free = delta > 0 ? 0 : 0 - delta;
 706
 707     QuicFrame frame;
 708     size_t bytes_consumed = creator_.CreateStreamFrame(
 709         kClientDataStreamId1, MakeIOVector(data), kOffset, false, &frame);
 710     EXPECT_LT(0u, bytes_consumed);
 711     ASSERT_TRUE(creator_.AddSavedFrame(frame));
 712     SerializedPacket serialized_packet = creator_.SerializePacket();
 713     ASSERT_TRUE(serialized_packet.packet);
 714     if (bytes_free > 0) {
 715       EXPECT_EQ(client_framer_.GetMaxPlaintextSize(kDefaultMaxPacketSize)
 716                 - bytes_free, serialized_packet.packet->length());
 717     } else {
 718       EXPECT_EQ(client_framer_.GetMaxPlaintextSize(kDefaultMaxPacketSize),
 719                 serialized_packet.packet->length());
 720     }
 721     delete serialized_packet.packet;
 722     delete serialized_packet.retransmittable_frames;
 723   }
 724 }
 725
 726 TEST_P(QuicPacketCreatorTest, SerializeVersionNegotiationPacket) {
 727   QuicFramerPeer::SetIsServer(&client_framer_, true);
 728   QuicVersionVector versions;
 729   versions.push_back(test::QuicVersionMax());
 730   scoped_ptr<QuicEncryptedPacket> encrypted(
 731       creator_.SerializeVersionNegotiationPacket(versions));
 732
 733   {
 734     InSequence s;
 735     EXPECT_CALL(framer_visitor_, OnPacket());
 736     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 737     EXPECT_CALL(framer_visitor_, OnVersionNegotiationPacket(_));
 738   }
 739   QuicFramerPeer::SetIsServer(&client_framer_, false);
 740   client_framer_.ProcessPacket(*encrypted);
 741 }
 742
 743 TEST_P(QuicPacketCreatorTest, UpdatePacketSequenceNumberLengthLeastAwaiting) {
 744   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER,
 745             creator_.next_sequence_number_length());
 746
 747   size_t max_packets_per_fec_group = 10;
 748   creator_.set_max_packets_per_fec_group(max_packets_per_fec_group);
 749   creator_.set_sequence_number(64 - max_packets_per_fec_group);
 750   creator_.UpdateSequenceNumberLength(2, 10000);
 751   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER,
 752             creator_.next_sequence_number_length());
 753
 754   creator_.set_sequence_number(64 * 256 - max_packets_per_fec_group);
 755   creator_.UpdateSequenceNumberLength(2, 10000);
 756   EXPECT_EQ(PACKET_2BYTE_SEQUENCE_NUMBER,
 757             creator_.next_sequence_number_length());
 758
 759   creator_.set_sequence_number(64 * 256 * 256 - max_packets_per_fec_group);
 760   creator_.UpdateSequenceNumberLength(2, 10000);
 761   EXPECT_EQ(PACKET_4BYTE_SEQUENCE_NUMBER,
 762             creator_.next_sequence_number_length());
 763
 764   creator_.set_sequence_number(
 765       GG_UINT64_C(64) * 256 * 256 * 256 * 256 - max_packets_per_fec_group);
 766   creator_.UpdateSequenceNumberLength(2, 10000);
 767   EXPECT_EQ(PACKET_6BYTE_SEQUENCE_NUMBER,
 768             creator_.next_sequence_number_length());
 769 }
 770
 771 TEST_P(QuicPacketCreatorTest, UpdatePacketSequenceNumberLengthBandwidth) {
 772   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER,
 773             creator_.next_sequence_number_length());
 774
 775   creator_.UpdateSequenceNumberLength(1, 10000);
 776   EXPECT_EQ(PACKET_1BYTE_SEQUENCE_NUMBER,
 777             creator_.next_sequence_number_length());
 778
 779   creator_.UpdateSequenceNumberLength(1, 10000 * 256);
 780   EXPECT_EQ(PACKET_2BYTE_SEQUENCE_NUMBER,
 781             creator_.next_sequence_number_length());
 782
 783   creator_.UpdateSequenceNumberLength(1, 10000 * 256 * 256);
 784   EXPECT_EQ(PACKET_4BYTE_SEQUENCE_NUMBER,
 785             creator_.next_sequence_number_length());
 786
 787   creator_.UpdateSequenceNumberLength(
 788       1, GG_UINT64_C(1000) * 256 * 256 * 256 * 256);
 789   EXPECT_EQ(PACKET_6BYTE_SEQUENCE_NUMBER,
 790             creator_.next_sequence_number_length());
 791 }
 792
 793 TEST_P(QuicPacketCreatorTest, CreateStreamFrameWithNotifier) {
 794   // Ensure that if CreateStreamFrame does not consume any data (e.g. a FIN only
 795   // frame) then any QuicAckNotifier that is passed in still gets attached to
 796   // the frame.
 797   scoped_refptr<MockAckNotifierDelegate> delegate(new MockAckNotifierDelegate);
 798   QuicAckNotifier notifier(delegate.get());
 799   QuicFrame frame;
 800   IOVector empty_iovector;
 801   bool fin = true;
 802   size_t consumed_bytes = creator_.CreateStreamFrameWithNotifier(
 803       1u, empty_iovector, 0u, fin, &notifier, &frame);
 804   EXPECT_EQ(0u, consumed_bytes);
 805   EXPECT_EQ(&notifier, frame.stream_frame->notifier);
 806   delete frame.stream_frame;
 807 }
 808
 809 TEST_P(QuicPacketCreatorTest, SerializeFrame) {
 810   if (!GetParam().version_serialization) {
 811     creator_.StopSendingVersion();
 812   }
 813   frames_.push_back(QuicFrame(new QuicStreamFrame(0u, false, 0u, IOVector())));
 814   SerializedPacket serialized = creator_.SerializeAllFrames(frames_);
 815   delete frames_[0].stream_frame;
 816
 817   QuicPacketHeader header;
 818   {
 819     InSequence s;
 820     EXPECT_CALL(framer_visitor_, OnPacket());
 821     EXPECT_CALL(framer_visitor_, OnUnauthenticatedPublicHeader(_));
 822     EXPECT_CALL(framer_visitor_, OnUnauthenticatedHeader(_));
 823     EXPECT_CALL(framer_visitor_, OnDecryptedPacket(_));
 824     EXPECT_CALL(framer_visitor_, OnPacketHeader(_)).WillOnce(
 825         DoAll(SaveArg<0>(&header), Return(true)));
 826     EXPECT_CALL(framer_visitor_, OnStreamFrame(_));
 827     EXPECT_CALL(framer_visitor_, OnPacketComplete());
 828   }
 829   ProcessPacket(serialized.packet);
 830   EXPECT_EQ(GetParam().version_serialization,
 831             header.public_header.version_flag);
 832   delete serialized.packet;
 833 }
 834
 835 TEST_P(QuicPacketCreatorTest, CreateStreamFrameTooLarge) {
 836   if (!GetParam().version_serialization) {
 837     creator_.StopSendingVersion();
 838   }
 839   // A string larger than fits into a frame.
 840   size_t payload_length;
 841   creator_.set_max_packet_length(GetPacketLengthForOneStream(
 842       client_framer_.version(),
 843       QuicPacketCreatorPeer::SendVersionInPacket(&creator_),
 844       PACKET_1BYTE_SEQUENCE_NUMBER, NOT_IN_FEC_GROUP, &payload_length));
 845   QuicFrame frame;
 846   const string too_long_payload(payload_length * 2, 'a');
 847   size_t consumed = creator_.CreateStreamFrame(
 848       1u, MakeIOVector(too_long_payload), 0u, true, &frame);
 849   EXPECT_EQ(payload_length, consumed);
 850   const string payload(payload_length, 'a');
 851   CheckStreamFrame(frame, 1u, payload, 0u, false);
 852   delete frame.stream_frame;
 853 }
 854
 855 TEST_P(QuicPacketCreatorTest, AddFrameAndSerialize) {
 856   if (!GetParam().version_serialization) {
 857     creator_.StopSendingVersion();
 858   }
 859   const size_t max_plaintext_size =
 860       client_framer_.GetMaxPlaintextSize(creator_.max_packet_length());
 861   EXPECT_FALSE(creator_.HasPendingFrames());
 862   EXPECT_EQ(max_plaintext_size -
 863             GetPacketHeaderSize(
 864                 creator_.connection_id_length(),
 865                 QuicPacketCreatorPeer::SendVersionInPacket(&creator_),
 866                 PACKET_1BYTE_SEQUENCE_NUMBER, NOT_IN_FEC_GROUP),
 867             creator_.BytesFree());
 868
 869   // Add a variety of frame types and then a padding frame.
 870   QuicAckFrame ack_frame(MakeAckFrame(0u));
 871   EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(&ack_frame)));
 872   EXPECT_TRUE(creator_.HasPendingFrames());
 873
 874   QuicCongestionFeedbackFrame congestion_feedback;
 875   congestion_feedback.type = kTCP;
 876   congestion_feedback.tcp.receive_window = 0x4030;
 877   EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(&congestion_feedback)));
 878   EXPECT_TRUE(creator_.HasPendingFrames());
 879
 880   QuicFrame frame;
 881   size_t consumed = creator_.CreateStreamFrame(
 882       1u, MakeIOVector("test"), 0u, false, &frame);
 883   EXPECT_EQ(4u, consumed);
 884   ASSERT_TRUE(frame.stream_frame);
 885   EXPECT_TRUE(creator_.AddSavedFrame(frame));
 886   EXPECT_TRUE(creator_.HasPendingFrames());
 887
 888   QuicPaddingFrame padding_frame;
 889   EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(&padding_frame)));
 890   EXPECT_TRUE(creator_.HasPendingFrames());
 891   EXPECT_EQ(0u, creator_.BytesFree());
 892
 893   EXPECT_FALSE(creator_.AddSavedFrame(QuicFrame(&ack_frame)));
 894
 895   // Ensure the packet is successfully created.
 896   SerializedPacket serialized = creator_.SerializePacket();
 897   ASSERT_TRUE(serialized.packet);
 898   delete serialized.packet;
 899   ASSERT_TRUE(serialized.retransmittable_frames);
 900   RetransmittableFrames* retransmittable = serialized.retransmittable_frames;
 901   ASSERT_EQ(1u, retransmittable->frames().size());
 902   EXPECT_EQ(STREAM_FRAME, retransmittable->frames()[0].type);
 903   ASSERT_TRUE(retransmittable->frames()[0].stream_frame);
 904   delete serialized.retransmittable_frames;
 905
 906   EXPECT_FALSE(creator_.HasPendingFrames());
 907   EXPECT_EQ(max_plaintext_size -
 908             GetPacketHeaderSize(
 909                 creator_.connection_id_length(),
 910                 QuicPacketCreatorPeer::SendVersionInPacket(&creator_),
 911                 PACKET_1BYTE_SEQUENCE_NUMBER,
 912                 NOT_IN_FEC_GROUP),
 913             creator_.BytesFree());
 914 }
 915
 916 TEST_P(QuicPacketCreatorTest, SerializeTruncatedAckFrameWithLargePacketSize) {
 917   if (!GetParam().version_serialization) {
 918     creator_.StopSendingVersion();
 919   }
 920   creator_.set_max_packet_length(kMaxPacketSize);
 921   const size_t max_plaintext_size =
 922       client_framer_.GetMaxPlaintextSize(creator_.max_packet_length());
 923
 924   // Serialized length of ack frame with 2000 nack ranges should be limited by
 925   // the number of nack ranges that can be fit in an ack frame.
 926   QuicAckFrame ack_frame = MakeAckFrameWithNackRanges(2000u, 0u);
 927   size_t frame_len = client_framer_.GetSerializedFrameLength(
 928       QuicFrame(&ack_frame), creator_.BytesFree(), true, true,
 929       NOT_IN_FEC_GROUP, PACKET_1BYTE_SEQUENCE_NUMBER);
 930   EXPECT_GT(creator_.BytesFree(), frame_len);
 931   EXPECT_GT(max_plaintext_size, creator_.PacketSize());
 932
 933   // Add ack frame to creator.
 934   EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(&ack_frame)));
 935   EXPECT_TRUE(creator_.HasPendingFrames());
 936   EXPECT_GT(max_plaintext_size, creator_.PacketSize());
 937   EXPECT_LT(0u, creator_.BytesFree());
 938
 939   // Make sure that an additional stream frame can be added to the packet.
 940   QuicFrame stream_frame;
 941   size_t consumed = creator_.CreateStreamFrame(
 942       2u, MakeIOVector("test"), 0u, false, &stream_frame);
 943   EXPECT_EQ(4u, consumed);
 944   ASSERT_TRUE(stream_frame.stream_frame);
 945   EXPECT_TRUE(creator_.AddSavedFrame(stream_frame));
 946   EXPECT_TRUE(creator_.HasPendingFrames());
 947
 948   // Ensure the packet is successfully created, and the packet size estimate
 949   // matches the serialized packet length.
 950   EXPECT_CALL(entropy_calculator_,
 951              EntropyHash(_)).WillOnce(testing::Return(0));
 952   size_t est_packet_size = creator_.PacketSize();
 953   SerializedPacket serialized = creator_.SerializePacket();
 954   ASSERT_TRUE(serialized.packet);
 955   EXPECT_EQ(est_packet_size, serialized.packet->length());
 956   delete serialized.retransmittable_frames;
 957   delete serialized.packet;
 958 }
 959
 960 TEST_P(QuicPacketCreatorTest, SerializeTruncatedAckFrameWithSmallPacketSize) {
 961   if (!GetParam().version_serialization) {
 962     creator_.StopSendingVersion();
 963   }
 964   creator_.set_max_packet_length(500u);
 965
 966   const size_t max_plaintext_size =
 967       client_framer_.GetMaxPlaintextSize(creator_.max_packet_length());
 968   EXPECT_EQ(max_plaintext_size - creator_.PacketSize(), creator_.BytesFree());
 969
 970   // Serialized length of ack frame with 2000 nack ranges should be limited by
 971   // the packet size.
 972   QuicAckFrame ack_frame = MakeAckFrameWithNackRanges(2000u, 0u);
 973   size_t frame_len = client_framer_.GetSerializedFrameLength(
 974       QuicFrame(&ack_frame), creator_.BytesFree(), true, true,
 975       NOT_IN_FEC_GROUP, PACKET_1BYTE_SEQUENCE_NUMBER);
 976   EXPECT_EQ(creator_.BytesFree(), frame_len);
 977
 978   // Add ack frame to creator.
 979   EXPECT_TRUE(creator_.AddSavedFrame(QuicFrame(&ack_frame)));
 980   EXPECT_TRUE(creator_.HasPendingFrames());
 981   EXPECT_EQ(max_plaintext_size, creator_.PacketSize());
 982   EXPECT_EQ(0u, creator_.BytesFree());
 983
 984   // Ensure the packet is successfully created, and the packet size estimate
 985   // may not match the serialized packet length.
 986   EXPECT_CALL(entropy_calculator_,
 987              EntropyHash(_)).WillOnce(Return(0));
 988   size_t est_packet_size = creator_.PacketSize();
 989   SerializedPacket serialized = creator_.SerializePacket();
 990   ASSERT_TRUE(serialized.packet);
 991   EXPECT_GE(est_packet_size, serialized.packet->length());
 992   delete serialized.packet;
 993 }
 994
 995
 996 TEST_P(QuicPacketCreatorTest, EntropyFlag) {
 997   frames_.push_back(QuicFrame(new QuicStreamFrame(0u, false, 0u, IOVector())));
 998
 999   for (int i = 0; i < 2; ++i) {
1000     for (int j = 0; j < 64; ++j) {
1001       SerializedPacket serialized = creator_.SerializeAllFrames(frames_);
1002       // Verify both BoolSource and hash algorithm.
1003       bool expected_rand_bool =
1004           (mock_random_.RandUint64() & (GG_UINT64_C(1) << j)) != 0;
1005       bool observed_rand_bool =
1006           (serialized.entropy_hash & (1 << ((j+1) % 8))) != 0;
1007       uint8 rest_of_hash = serialized.entropy_hash & ~(1 << ((j+1) % 8));
1008       EXPECT_EQ(expected_rand_bool, observed_rand_bool);
1009       EXPECT_EQ(0, rest_of_hash);
1010       delete serialized.packet;
1011     }
1012     // After 64 calls, BoolSource will refresh the bucket - make sure it does.
1013     mock_random_.ChangeValue();
1014   }
1015
1016   delete frames_[0].stream_frame;
1017 }
1018
1019 }  // namespace
1020 }  // namespace test
1021 }  // namespace net