Implement basic classes for HPACK (HTTP/2 compression)

net/spdy/hpack_entry_test.cc

+#include "net/spdy/hpack_entry.h"
+
+#include <string>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace net {
+
+namespace {
+
+using std::string;
+
+const char kName[] = "headername";
+const uint32 kNameStringLength = arraysize(kName) - 1;
+const char kValue[] = "Header Value";
+const uint32 kValueStringLength = arraysize(kValue) - 1;
+
+// Make sure a default-constructed entry is still valid and starts off
+// empty, unreferenced, and untouched.
+TEST(HpackEntryTest, DefaultConstructor) {
+  HpackEntry entry;
+  EXPECT_TRUE(entry.name().empty());
+  EXPECT_TRUE(entry.value().empty());
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+  EXPECT_EQ(HpackEntry::kSizeOverhead, entry.Size());
+}
+
+// Make sure a non-default-constructed HpackEntry starts off with
+// copies of the given name and value, and unreferenced and untouched.
+TEST(HpackEntryTest, NormalConstructor) {
+  string name = kName;
+  string value = kValue;
+  HpackEntry entry(name, value);
+  EXPECT_EQ(name, entry.name());
+  EXPECT_EQ(value, entry.value());
+
+  ++name[0];
+  ++value[0];
+  EXPECT_NE(name, entry.name());
+  EXPECT_NE(value, entry.name());
+
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+  EXPECT_EQ(
+      kNameStringLength + kValueStringLength + HpackEntry::kSizeOverhead,
+      entry.Size());
+}
+
+// Make sure twiddling the referenced bit doesn't affect the touch
+// count when it's kUntouched.
+TEST(HpackEntryTest, IsReferencedUntouched) {
+  HpackEntry entry(kName, kValue);
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+
+  entry.SetReferenced(true);
+  EXPECT_TRUE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+
+  entry.SetReferenced(false);
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+}
+
+// Make sure changing the touch count doesn't affect the referenced
+// bit when it's false.
+TEST(HpackEntryTest, TouchCountNotReferenced) {
+  HpackEntry entry(kName, kValue);
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+
+  entry.AddTouches(0);
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(0u, entry.TouchCount());
+
+  entry.AddTouches(255);
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(255u, entry.TouchCount());
+
+  // Assumes kUntouched is 1 + max touch count.
+  entry.AddTouches(HpackEntry::kUntouched - 256);
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched - 1, entry.TouchCount());
+
+  entry.ClearTouches();
+  EXPECT_FALSE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+}
+
+// Make sure changing the touch count doesn't affect the referenced
+// bit when it's true.
+TEST(HpackEntryTest, TouchCountReferenced) {
+  HpackEntry entry(kName, kValue);
+  entry.SetReferenced(true);
+  EXPECT_TRUE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+
+  entry.AddTouches(0);
+  EXPECT_TRUE(entry.IsReferenced());
+  EXPECT_EQ(0u, entry.TouchCount());
+
+  entry.AddTouches(255);
+  EXPECT_TRUE(entry.IsReferenced());
+  EXPECT_EQ(255u, entry.TouchCount());
+
+  // Assumes kUntouched is 1 + max touch count.
+  entry.AddTouches(HpackEntry::kUntouched - 256);
+  EXPECT_TRUE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched - 1, entry.TouchCount());
+
+  entry.ClearTouches();
+  EXPECT_TRUE(entry.IsReferenced());
+  EXPECT_EQ(HpackEntry::kUntouched, entry.TouchCount());
+}
+
+// Make sure equality takes into account all entry fields.
+TEST(HpackEntryTest, Equals) {
+  HpackEntry entry1(kName, kValue);
+  HpackEntry entry2(kName, kValue);
+  EXPECT_TRUE(entry1.Equals(entry2));
+
+  entry2.SetReferenced(true);
+  EXPECT_FALSE(entry1.Equals(entry2));
+  entry2.SetReferenced(false);
+  EXPECT_TRUE(entry1.Equals(entry2));
+
+  entry2.AddTouches(0);
+  EXPECT_FALSE(entry1.Equals(entry2));
+  entry2.ClearTouches();
+  EXPECT_TRUE(entry1.Equals(entry2));
+
+  entry2.AddTouches(1);
+  EXPECT_FALSE(entry1.Equals(entry2));
+  entry2.ClearTouches();
+  EXPECT_TRUE(entry1.Equals(entry2));
+
+  HpackEntry entry3(kName, string(kValue) + kValue);
+  EXPECT_FALSE(entry1.Equals(entry3));
+
+  HpackEntry entry4(string(kName) + kName, kValue);
+  EXPECT_FALSE(entry1.Equals(entry4));
+}
+
+}  // namespace
+
+}  // namespace net