net/quic/iovector_test.cc

   1 // Copyright 2013 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/iovector.h"
   6
   7 #include <string.h>
   8
   9 #include "base/logging.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11
  12 using std::string;
  13
  14 namespace net {
  15 namespace test {
  16 namespace {
  17
  18 const char* const test_data[] = {
  19   "test string 1, a medium size one.",
  20   "test string2",
  21   "test string      3, a looooooooooooong loooooooooooooooong string"
  22 };
  23
  24 TEST(IOVectorTest, CopyConstructor) {
  25   IOVector iov1;
  26   for (size_t i = 0; i < arraysize(test_data); ++i) {
  27     iov1.Append(const_cast<char*>(test_data[i]), strlen(test_data[i]));
  28   }
  29   IOVector iov2 = iov1;
  30   EXPECT_EQ(iov2.Size(), iov1.Size());
  31   for (size_t i = 0; i < iov2.Size(); ++i) {
  32     EXPECT_TRUE(iov2.iovec()[i].iov_base == iov1.iovec()[i].iov_base);
  33     EXPECT_EQ(iov2.iovec()[i].iov_len, iov1.iovec()[i].iov_len);
  34   }
  35   EXPECT_EQ(iov2.TotalBufferSize(), iov1.TotalBufferSize());
  36 }
  37
  38 TEST(IOVectorTest, AssignmentOperator) {
  39   IOVector iov1;
  40   for (size_t i = 0; i < arraysize(test_data); ++i) {
  41     iov1.Append(const_cast<char*>(test_data[i]), strlen(test_data[i]));
  42   }
  43   IOVector iov2;
  44   iov2.Append(const_cast<char*>("ephemeral string"), 16);
  45   // The following assignment results in a shallow copy;
  46   // both IOVectors point to the same underlying data.
  47   iov2 = iov1;
  48   EXPECT_EQ(iov2.Size(), iov1.Size());
  49   for (size_t i = 0; i < iov2.Size(); ++i) {
  50     EXPECT_TRUE(iov2.iovec()[i].iov_base == iov1.iovec()[i].iov_base);
  51     EXPECT_EQ(iov2.iovec()[i].iov_len, iov1.iovec()[i].iov_len);
  52   }
  53   EXPECT_EQ(iov2.TotalBufferSize(), iov1.TotalBufferSize());
  54 }
  55
  56 TEST(IOVectorTest, Append) {
  57   IOVector iov;
  58   int length = 0;
  59   const struct iovec* iov2 = iov.iovec();
  60
  61   ASSERT_EQ(0u, iov.Size());
  62   ASSERT_TRUE(iov2 == nullptr);
  63   for (size_t i = 0; i < arraysize(test_data); ++i) {
  64     const int str_len = strlen(test_data[i]);
  65     const int append_len = str_len / 2;
  66     // This should append a new block
  67     iov.Append(const_cast<char*>(test_data[i]), append_len);
  68     length += append_len;
  69     ASSERT_EQ(i + 1, static_cast<size_t>(iov.Size()));
  70     ASSERT_TRUE(iov.LastBlockEnd() == test_data[i] + append_len);
  71     // This should just lengthen the existing block.
  72     iov.Append(const_cast<char*>(test_data[i] + append_len),
  73                str_len - append_len);
  74     length += (str_len - append_len);
  75     ASSERT_EQ(i + 1, static_cast<size_t>(iov.Size()));
  76     ASSERT_TRUE(iov.LastBlockEnd() == test_data[i] + str_len);
  77   }
  78
  79   iov2 = iov.iovec();
  80   ASSERT_TRUE(iov2 != nullptr);
  81   for (size_t i = 0; i < iov.Size(); ++i) {
  82     ASSERT_TRUE(test_data[i] == iov2[i].iov_base);
  83     ASSERT_EQ(strlen(test_data[i]), iov2[i].iov_len);
  84   }
  85 }
  86
  87 TEST(IOVectorTest, AppendIovec) {
  88   IOVector iov;
  89   const struct iovec test_iov[] = {
  90     {const_cast<char*>("foo"), 3},
  91     {const_cast<char*>("bar"), 3},
  92     {const_cast<char*>("buzzzz"), 6}
  93   };
  94   iov.AppendIovec(test_iov, arraysize(test_iov));
  95   for (size_t i = 0; i < arraysize(test_iov); ++i) {
  96     EXPECT_EQ(test_iov[i].iov_base, iov.iovec()[i].iov_base);
  97     EXPECT_EQ(test_iov[i].iov_len, iov.iovec()[i].iov_len);
  98   }
  99
 100   // Test AppendIovecAtMostBytes.
 101   iov.Clear();
 102   // Stop in the middle of a block.
 103   EXPECT_EQ(5u, iov.AppendIovecAtMostBytes(test_iov, arraysize(test_iov), 5));
 104   EXPECT_EQ(5u, iov.TotalBufferSize());
 105   iov.Append(static_cast<char*>(test_iov[1].iov_base) + 2, 1);
 106   // Make sure the boundary case, where max_bytes == size of block also works.
 107   EXPECT_EQ(6u, iov.AppendIovecAtMostBytes(&test_iov[2], 1, 6));
 108   ASSERT_LE(arraysize(test_iov), static_cast<size_t>(iov.Size()));
 109   for (size_t i = 0; i < arraysize(test_iov); ++i) {
 110     EXPECT_EQ(test_iov[i].iov_base, iov.iovec()[i].iov_base);
 111     EXPECT_EQ(test_iov[i].iov_len, iov.iovec()[i].iov_len);
 112   }
 113 }
 114
 115 TEST(IOVectorTest, ConsumeHalfBlocks) {
 116   IOVector iov;
 117   int length = 0;
 118
 119   for (size_t i = 0; i < arraysize(test_data); ++i) {
 120     const int str_len = strlen(test_data[i]);
 121     iov.Append(const_cast<char*>(test_data[i]), str_len);
 122     length += str_len;
 123   }
 124   const char* endp = iov.LastBlockEnd();
 125   for (size_t i = 0; i < arraysize(test_data); ++i) {
 126     const struct iovec* iov2 = iov.iovec();
 127     const size_t str_len = strlen(test_data[i]);
 128     size_t tmp = str_len / 2;
 129
 130     ASSERT_TRUE(iov2 != nullptr);
 131     ASSERT_TRUE(iov2[0].iov_base == test_data[i]);
 132     ASSERT_EQ(str_len, iov2[0].iov_len);
 133
 134     // Consume half of the first block.
 135     size_t consumed = iov.Consume(tmp);
 136     ASSERT_EQ(tmp, consumed);
 137     ASSERT_EQ(arraysize(test_data) - i, static_cast<size_t>(iov.Size()));
 138     iov2 = iov.iovec();
 139     ASSERT_TRUE(iov2 != nullptr);
 140     ASSERT_TRUE(iov2[0].iov_base == test_data[i] + tmp);
 141     ASSERT_EQ(iov2[0].iov_len, str_len - tmp);
 142
 143     // Consume the rest of the first block
 144     consumed = iov.Consume(str_len - tmp);
 145     ASSERT_EQ(str_len - tmp, consumed);
 146     ASSERT_EQ(arraysize(test_data) - i - 1, static_cast<size_t>(iov.Size()));
 147     iov2 = iov.iovec();
 148     if (iov.Size() > 0) {
 149       ASSERT_TRUE(iov2 != nullptr);
 150       ASSERT_TRUE(iov.LastBlockEnd() == endp);
 151     } else {
 152       ASSERT_TRUE(iov2 == nullptr);
 153       ASSERT_TRUE(iov.LastBlockEnd() == nullptr);
 154     }
 155   }
 156 }
 157
 158 TEST(IOVectorTest, ConsumeTwoAndHalfBlocks) {
 159   IOVector iov;
 160   int length = 0;
 161
 162   for (size_t i = 0; i < arraysize(test_data); ++i) {
 163     const int str_len = strlen(test_data[i]);
 164     iov.Append(const_cast<char*>(test_data[i]), str_len);
 165     length += str_len;
 166   }
 167   const size_t last_len = strlen(test_data[arraysize(test_data) - 1]);
 168   const size_t half_len = last_len / 2;
 169
 170   const char* endp = iov.LastBlockEnd();
 171   size_t consumed = iov.Consume(length - half_len);
 172   ASSERT_EQ(length - half_len, consumed);
 173   const struct iovec* iov2 = iov.iovec();
 174   ASSERT_TRUE(iov2 != nullptr);
 175   ASSERT_EQ(1u, iov.Size());
 176   ASSERT_TRUE(iov2[0].iov_base ==
 177               test_data[arraysize(test_data) - 1] + last_len - half_len);
 178   ASSERT_EQ(half_len, iov2[0].iov_len);
 179   ASSERT_TRUE(iov.LastBlockEnd() == endp);
 180
 181   consumed = iov.Consume(half_len);
 182   ASSERT_EQ(half_len, consumed);
 183   iov2 = iov.iovec();
 184   ASSERT_EQ(0u, iov.Size());
 185   ASSERT_TRUE(iov2 == nullptr);
 186   ASSERT_TRUE(iov.LastBlockEnd() == nullptr);
 187 }
 188
 189 TEST(IOVectorTest, ConsumeTooMuch) {
 190   IOVector iov;
 191   int length = 0;
 192
 193   for (size_t i = 0; i < arraysize(test_data); ++i) {
 194     const int str_len = strlen(test_data[i]);
 195     iov.Append(const_cast<char*>(test_data[i]), str_len);
 196     length += str_len;
 197   }
 198
 199   int consumed = 0;
 200   consumed = iov.Consume(length);
 201   // TODO(rtenneti): enable when chromium supports EXPECT_DFATAL.
 202   /*
 203   EXPECT_DFATAL(
 204       {consumed = iov.Consume(length + 1);},
 205       "Attempting to consume 1 non-existent bytes.");
 206   */
 207   ASSERT_EQ(length, consumed);
 208   const struct iovec* iov2 = iov.iovec();
 209   ASSERT_EQ(0u, iov.Size());
 210   ASSERT_TRUE(iov2 == nullptr);
 211   ASSERT_TRUE(iov.LastBlockEnd() == nullptr);
 212 }
 213
 214 TEST(IOVectorTest, Clear) {
 215   IOVector iov;
 216   int length = 0;
 217
 218   for (size_t i = 0; i < arraysize(test_data); ++i) {
 219     const int str_len = strlen(test_data[i]);
 220     iov.Append(const_cast<char*>(test_data[i]), str_len);
 221     length += str_len;
 222   }
 223   const struct iovec* iov2 = iov.iovec();
 224   ASSERT_TRUE(iov2 != nullptr);
 225   ASSERT_EQ(arraysize(test_data), static_cast<size_t>(iov.Size()));
 226
 227   iov.Clear();
 228   iov2 = iov.iovec();
 229   ASSERT_EQ(0u, iov.Size());
 230   ASSERT_TRUE(iov2 == nullptr);
 231 }
 232
 233 TEST(IOVectorTest, Capacity) {
 234   IOVector iov;
 235   // Note: IOVector merges adjacent Appends() into a single iov.
 236   // Therefore, if we expect final size of iov to be 3, we must insure
 237   // that the items we are appending are not adjacent. To achieve that
 238   // we use use an array (a[1] provides a buffer between a[0] and b[0],
 239   // and makes them non-adjacent).
 240   char a[2], b[2], c[2];
 241   iov.Append(&a[0], 1);
 242   iov.Append(&b[0], 1);
 243   iov.Append(&c[0], 1);
 244   ASSERT_EQ(3u, iov.Size());
 245   size_t capacity = iov.Capacity();
 246   EXPECT_LE(iov.Size(), capacity);
 247   iov.Consume(2);
 248   // The capacity should not have changed.
 249   EXPECT_EQ(capacity, iov.Capacity());
 250 }
 251
 252 TEST(IOVectorTest, Swap) {
 253   IOVector iov1, iov2;
 254   // See IOVector merge comment above.
 255   char a[2], b[2], c[2], d[2], e[2];
 256   iov1.Append(&a[0], 1);
 257   iov1.Append(&b[0], 1);
 258
 259   iov2.Append(&c[0], 1);
 260   iov2.Append(&d[0], 1);
 261   iov2.Append(&e[0], 1);
 262   iov1.Swap(&iov2);
 263
 264   ASSERT_EQ(3u, iov1.Size());
 265   EXPECT_EQ(&c[0], iov1.iovec()[0].iov_base);
 266   EXPECT_EQ(1u, iov1.iovec()[0].iov_len);
 267   EXPECT_EQ(&d[0], iov1.iovec()[1].iov_base);
 268   EXPECT_EQ(1u, iov1.iovec()[1].iov_len);
 269   EXPECT_EQ(&e[0], iov1.iovec()[2].iov_base);
 270   EXPECT_EQ(1u, iov1.iovec()[2].iov_len);
 271
 272   ASSERT_EQ(2u, iov2.Size());
 273   EXPECT_EQ(&a[0], iov2.iovec()[0].iov_base);
 274   EXPECT_EQ(1u, iov2.iovec()[0].iov_len);
 275   EXPECT_EQ(&b[0], iov2.iovec()[1].iov_base);
 276   EXPECT_EQ(1u, iov2.iovec()[1].iov_len);
 277 }
 278
 279 }  // namespace
 280 }  // namespace test
 281 }  // namespace net