Land recent QUIC changes.

net/quic/quic_packet_entropy_manager_test.cc

+// 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/quic/quic_packet_entropy_manager.h"
+
+#include <algorithm>
+#include <vector>
+
+#include "testing/gmock/include/gmock/gmock.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+using std::make_pair;
+using std::pair;
+using std::vector;
+
+namespace net {
+namespace test {
+namespace {
+
+class QuicPacketEntropyManagerTest : public ::testing::Test {
+ protected:
+  QuicPacketEntropyManager entropy_manager_;
+};
+
+TEST_F(QuicPacketEntropyManagerTest, ReceivedPacketEntropyHash) {
+  vector<pair<QuicPacketSequenceNumber, QuicPacketEntropyHash> > entropies;
+  entropies.push_back(make_pair(1, 12));
+  entropies.push_back(make_pair(7, 1));
+  entropies.push_back(make_pair(2, 33));
+  entropies.push_back(make_pair(5, 3));
+  entropies.push_back(make_pair(8, 34));
+
+  for (size_t i = 0; i < entropies.size(); ++i) {
+    entropy_manager_.RecordReceivedPacketEntropyHash(entropies[i].first,
+                                                     entropies[i].second);
+  }
+
+  sort(entropies.begin(), entropies.end());
+
+  QuicPacketEntropyHash hash = 0;
+  size_t index = 0;
+  for (size_t i = 1; i <= (*entropies.rbegin()).first; ++i) {
+    if (entropies[index].first == i) {
+      hash ^= entropies[index].second;
+      ++index;
+    }
+    EXPECT_EQ(hash, entropy_manager_.ReceivedEntropyHash(i));
+  }
+};
+
+TEST_F(QuicPacketEntropyManagerTest, EntropyHashBelowLeastObserved) {
+  EXPECT_EQ(0, entropy_manager_.ReceivedEntropyHash(0));
+  EXPECT_EQ(0, entropy_manager_.ReceivedEntropyHash(9));
+  entropy_manager_.RecordReceivedPacketEntropyHash(4, 5);
+  EXPECT_EQ(0, entropy_manager_.ReceivedEntropyHash(3));
+};
+
+TEST_F(QuicPacketEntropyManagerTest, EntropyHashAboveLargesObserved) {
+  EXPECT_EQ(0, entropy_manager_.ReceivedEntropyHash(0));
+  EXPECT_EQ(0, entropy_manager_.ReceivedEntropyHash(9));
+  entropy_manager_.RecordReceivedPacketEntropyHash(4, 5);
+  EXPECT_EQ(0, entropy_manager_.ReceivedEntropyHash(3));
+};
+
+TEST_F(QuicPacketEntropyManagerTest, RecalculateReceivedEntropyHash) {
+  vector<pair<QuicPacketSequenceNumber, QuicPacketEntropyHash> > entropies;
+  entropies.push_back(make_pair(1, 12));
+  entropies.push_back(make_pair(2, 1));
+  entropies.push_back(make_pair(3, 33));
+  entropies.push_back(make_pair(4, 3));
+  entropies.push_back(make_pair(5, 34));
+  entropies.push_back(make_pair(6, 29));
+
+  QuicPacketEntropyHash entropy_hash = 0;
+  for (size_t i = 0; i < entropies.size(); ++i) {
+    entropy_manager_.RecordReceivedPacketEntropyHash(entropies[i].first,
+                                                     entropies[i].second);
+    entropy_hash ^= entropies[i].second;
+  }
+  EXPECT_EQ(entropy_hash, entropy_manager_.ReceivedEntropyHash(6));
+
+  // Now set the entropy hash up to 4 to be 100.
+  entropy_hash ^= 100;
+  for (size_t i = 0; i < 3; ++i) {
+    entropy_hash ^= entropies[i].second;
+  }
+  entropy_manager_.RecalculateReceivedEntropyHash(4, 100);
+  EXPECT_EQ(entropy_hash, entropy_manager_.ReceivedEntropyHash(6));
+}
+
+TEST_F(QuicPacketEntropyManagerTest, SentEntropyHash) {
+  EXPECT_EQ(0, entropy_manager_.SentEntropyHash(0));
+
+  vector<pair<QuicPacketSequenceNumber, QuicPacketEntropyHash> > entropies;
+  entropies.push_back(make_pair(1, 12));
+  entropies.push_back(make_pair(2, 1));
+  entropies.push_back(make_pair(3, 33));
+  entropies.push_back(make_pair(4, 3));
+
+  for (size_t i = 0; i < entropies.size(); ++i) {
+    entropy_manager_.RecordSentPacketEntropyHash(entropies[i].first,
+                                                 entropies[i].second);
+  }
+
+  QuicPacketEntropyHash hash = 0;
+  for (size_t i = 0; i < entropies.size(); ++i) {
+    hash ^= entropies[i].second;
+    EXPECT_EQ(hash, entropy_manager_.SentEntropyHash(i + 1));
+  }
+}
+
+TEST_F(QuicPacketEntropyManagerTest, IsValidEntropy) {
+  QuicPacketEntropyHash entropies[10] =
+      {12, 1, 33, 3, 32, 100, 28, 42, 22, 255};
+  for (size_t i = 0; i < 10; ++i) {
+    entropy_manager_.RecordSentPacketEntropyHash(i + 1, entropies[i]);
+  }
+
+  SequenceNumberSet missing_packets;
+  missing_packets.insert(1);
+  missing_packets.insert(4);
+  missing_packets.insert(7);
+  missing_packets.insert(8);
+
+  QuicPacketEntropyHash entropy_hash = 0;
+  for (size_t i = 0; i < 10; ++i) {
+    if (missing_packets.find(i + 1) == missing_packets.end()) {
+      entropy_hash ^= entropies[i];
+    }
+  }
+
+  EXPECT_TRUE(entropy_manager_.IsValidEntropy(10, missing_packets,
+                                              entropy_hash));
+}
+
+}  // namespace
+}  // namespace test
+}  // namespace net