folly/io/test/CompressionTest.cpp

   1 /*
   2  * Copyright 2017 Facebook, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *   http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <folly/io/Compression.h>
  18
  19 #include <algorithm>
  20 #include <random>
  21 #include <set>
  22 #include <thread>
  23 #include <unordered_map>
  24 #include <utility>
  25
  26 #include <boost/noncopyable.hpp>
  27 #include <glog/logging.h>
  28
  29 #include <folly/Benchmark.h>
  30 #include <folly/Hash.h>
  31 #include <folly/Memory.h>
  32 #include <folly/Random.h>
  33 #include <folly/Varint.h>
  34 #include <folly/io/IOBufQueue.h>
  35 #include <folly/portability/GTest.h>
  36
  37 #if FOLLY_HAVE_LIBZSTD
  38 #include <zstd.h>
  39 #endif
  40
  41 #if FOLLY_HAVE_LIBZ
  42 #include <folly/io/compression/Zlib.h>
  43 #endif
  44
  45 namespace zlib = folly::io::zlib;
  46
  47 namespace folly {
  48 namespace io {
  49 namespace test {
  50
  51 class DataHolder : private boost::noncopyable {
  52  public:
  53   uint64_t hash(size_t size) const;
  54   ByteRange data(size_t size) const;
  55
  56  protected:
  57   explicit DataHolder(size_t sizeLog2);
  58   const size_t size_;
  59   std::unique_ptr<uint8_t[]> data_;
  60   mutable std::unordered_map<uint64_t, uint64_t> hashCache_;
  61 };
  62
  63 DataHolder::DataHolder(size_t sizeLog2)
  64   : size_(size_t(1) << sizeLog2),
  65     data_(new uint8_t[size_]) {
  66 }
  67
  68 uint64_t DataHolder::hash(size_t size) const {
  69   CHECK_LE(size, size_);
  70   auto p = hashCache_.find(size);
  71   if (p != hashCache_.end()) {
  72     return p->second;
  73   }
  74
  75   uint64_t h = folly::hash::fnv64_buf(data_.get(), size);
  76   hashCache_[size] = h;
  77   return h;
  78 }
  79
  80 ByteRange DataHolder::data(size_t size) const {
  81   CHECK_LE(size, size_);
  82   return ByteRange(data_.get(), size);
  83 }
  84
  85 uint64_t hashIOBuf(const IOBuf* buf) {
  86   uint64_t h = folly::hash::FNV_64_HASH_START;
  87   for (auto& range : *buf) {
  88     h = folly::hash::fnv64_buf(range.data(), range.size(), h);
  89   }
  90   return h;
  91 }
  92
  93 class RandomDataHolder : public DataHolder {
  94  public:
  95   explicit RandomDataHolder(size_t sizeLog2);
  96 };
  97
  98 RandomDataHolder::RandomDataHolder(size_t sizeLog2)
  99   : DataHolder(sizeLog2) {
 100   static constexpr size_t numThreadsLog2 = 3;
 101   static constexpr size_t numThreads = size_t(1) << numThreadsLog2;
 102
 103   uint32_t seed = randomNumberSeed();
 104
 105   std::vector<std::thread> threads;
 106   threads.reserve(numThreads);
 107   for (size_t t = 0; t < numThreads; ++t) {
 108     threads.emplace_back([this, seed, t, sizeLog2] {
 109       std::mt19937 rng(seed + t);
 110       size_t countLog2 = sizeLog2 - numThreadsLog2;
 111       size_t start = size_t(t) << countLog2;
 112       for (size_t i = 0; i < countLog2; ++i) {
 113         this->data_[start + i] = rng();
 114       }
 115     });
 116   }
 117
 118   for (auto& t : threads) {
 119     t.join();
 120   }
 121 }
 122
 123 class ConstantDataHolder : public DataHolder {
 124  public:
 125   explicit ConstantDataHolder(size_t sizeLog2);
 126 };
 127
 128 ConstantDataHolder::ConstantDataHolder(size_t sizeLog2)
 129   : DataHolder(sizeLog2) {
 130   memset(data_.get(), 'a', size_);
 131 }
 132
 133 constexpr size_t dataSizeLog2 = 27;  // 128MiB
 134 RandomDataHolder randomDataHolder(dataSizeLog2);
 135 ConstantDataHolder constantDataHolder(dataSizeLog2);
 136
 137 // The intersection of the provided codecs & those that are compiled in.
 138 static std::vector<CodecType> supportedCodecs(std::vector<CodecType> const& v) {
 139   std::vector<CodecType> supported;
 140
 141   std::copy_if(
 142       std::begin(v),
 143       std::end(v),
 144       std::back_inserter(supported),
 145       hasCodec);
 146
 147   return supported;
 148 }
 149
 150 // All compiled-in compression codecs.
 151 static std::vector<CodecType> availableCodecs() {
 152   std::vector<CodecType> codecs;
 153
 154   for (size_t i = 0; i < static_cast<size_t>(CodecType::NUM_CODEC_TYPES); ++i) {
 155     auto type = static_cast<CodecType>(i);
 156     if (hasCodec(type)) {
 157       codecs.push_back(type);
 158     }
 159   }
 160
 161   return codecs;
 162 }
 163
 164 static std::vector<CodecType> availableStreamCodecs() {
 165   std::vector<CodecType> codecs;
 166
 167   for (size_t i = 0; i < static_cast<size_t>(CodecType::NUM_CODEC_TYPES); ++i) {
 168     auto type = static_cast<CodecType>(i);
 169     if (hasStreamCodec(type)) {
 170       codecs.push_back(type);
 171     }
 172   }
 173
 174   return codecs;
 175 }
 176
 177 TEST(CompressionTestNeedsUncompressedLength, Simple) {
 178   static const struct {
 179     CodecType type;
 180     bool needsUncompressedLength;
 181   } expectations[] = {
 182       {CodecType::NO_COMPRESSION, false},
 183       {CodecType::LZ4, true},
 184       {CodecType::SNAPPY, false},
 185       {CodecType::ZLIB, false},
 186       {CodecType::LZ4_VARINT_SIZE, false},
 187       {CodecType::LZMA2, false},
 188       {CodecType::LZMA2_VARINT_SIZE, false},
 189       {CodecType::ZSTD, false},
 190       {CodecType::GZIP, false},
 191       {CodecType::LZ4_FRAME, false},
 192       {CodecType::BZIP2, false},
 193   };
 194
 195   for (auto const& test : expectations) {
 196     if (hasCodec(test.type)) {
 197       EXPECT_EQ(getCodec(test.type)->needsUncompressedLength(),
 198                 test.needsUncompressedLength);
 199     }
 200   }
 201 }
 202
 203 class CompressionTest
 204     : public testing::TestWithParam<std::tr1::tuple<int, int, CodecType>> {
 205  protected:
 206   void SetUp() override {
 207     auto tup = GetParam();
 208     int lengthLog = std::tr1::get<0>(tup);
 209     // Small hack to test empty data
 210     uncompressedLength_ =
 211         (lengthLog < 0) ? 0 : uint64_t(1) << std::tr1::get<0>(tup);
 212     chunks_ = std::tr1::get<1>(tup);
 213     codec_ = getCodec(std::tr1::get<2>(tup));
 214   }
 215
 216   void runSimpleIOBufTest(const DataHolder& dh);
 217
 218   void runSimpleStringTest(const DataHolder& dh);
 219
 220  private:
 221   std::unique_ptr<IOBuf> split(std::unique_ptr<IOBuf> data) const;
 222
 223   uint64_t uncompressedLength_;
 224   size_t chunks_;
 225   std::unique_ptr<Codec> codec_;
 226 };
 227
 228 void CompressionTest::runSimpleIOBufTest(const DataHolder& dh) {
 229   const auto original = split(IOBuf::wrapBuffer(dh.data(uncompressedLength_)));
 230   const auto compressed = split(codec_->compress(original.get()));
 231   EXPECT_LE(
 232       compressed->computeChainDataLength(),
 233       codec_->maxCompressedLength(uncompressedLength_));
 234   if (!codec_->needsUncompressedLength()) {
 235     auto uncompressed = codec_->uncompress(compressed.get());
 236     EXPECT_EQ(uncompressedLength_, uncompressed->computeChainDataLength());
 237     EXPECT_EQ(dh.hash(uncompressedLength_), hashIOBuf(uncompressed.get()));
 238   }
 239   {
 240     auto uncompressed = codec_->uncompress(compressed.get(),
 241                                            uncompressedLength_);
 242     EXPECT_EQ(uncompressedLength_, uncompressed->computeChainDataLength());
 243     EXPECT_EQ(dh.hash(uncompressedLength_), hashIOBuf(uncompressed.get()));
 244   }
 245 }
 246
 247 void CompressionTest::runSimpleStringTest(const DataHolder& dh) {
 248   const auto original = std::string(
 249       reinterpret_cast<const char*>(dh.data(uncompressedLength_).data()),
 250       uncompressedLength_);
 251   const auto compressed = codec_->compress(original);
 252   EXPECT_LE(
 253       compressed.length(), codec_->maxCompressedLength(uncompressedLength_));
 254
 255   if (!codec_->needsUncompressedLength()) {
 256     auto uncompressed = codec_->uncompress(compressed);
 257     EXPECT_EQ(uncompressedLength_, uncompressed.length());
 258     EXPECT_EQ(uncompressed, original);
 259   }
 260   {
 261     auto uncompressed = codec_->uncompress(compressed, uncompressedLength_);
 262     EXPECT_EQ(uncompressedLength_, uncompressed.length());
 263     EXPECT_EQ(uncompressed, original);
 264   }
 265 }
 266
 267 // Uniformly split data into (potentially empty) chunks.
 268 std::unique_ptr<IOBuf> CompressionTest::split(
 269     std::unique_ptr<IOBuf> data) const {
 270   if (data->isChained()) {
 271     data->coalesce();
 272   }
 273
 274   const size_t size = data->computeChainDataLength();
 275
 276   std::multiset<size_t> splits;
 277   for (size_t i = 1; i < chunks_; ++i) {
 278     splits.insert(Random::rand64(size));
 279   }
 280
 281   folly::IOBufQueue result;
 282
 283   size_t offset = 0;
 284   for (size_t split : splits) {
 285     result.append(IOBuf::copyBuffer(data->data() + offset, split - offset));
 286     offset = split;
 287   }
 288   result.append(IOBuf::copyBuffer(data->data() + offset, size - offset));
 289
 290   return result.move();
 291 }
 292
 293 TEST_P(CompressionTest, RandomData) {
 294   runSimpleIOBufTest(randomDataHolder);
 295 }
 296
 297 TEST_P(CompressionTest, ConstantData) {
 298   runSimpleIOBufTest(constantDataHolder);
 299 }
 300
 301 TEST_P(CompressionTest, RandomDataString) {
 302   runSimpleStringTest(randomDataHolder);
 303 }
 304
 305 TEST_P(CompressionTest, ConstantDataString) {
 306   runSimpleStringTest(constantDataHolder);
 307 }
 308
 309 INSTANTIATE_TEST_CASE_P(
 310     CompressionTest,
 311     CompressionTest,
 312     testing::Combine(
 313         testing::Values(-1, 0, 1, 12, 22, 25, 27),
 314         testing::Values(1, 2, 3, 8, 65),
 315         testing::ValuesIn(availableCodecs())));
 316
 317 class CompressionVarintTest
 318     : public testing::TestWithParam<std::tr1::tuple<int, CodecType>> {
 319  protected:
 320   void SetUp() override {
 321     auto tup = GetParam();
 322     uncompressedLength_ = uint64_t(1) << std::tr1::get<0>(tup);
 323     codec_ = getCodec(std::tr1::get<1>(tup));
 324   }
 325
 326   void runSimpleTest(const DataHolder& dh);
 327
 328   uint64_t uncompressedLength_;
 329   std::unique_ptr<Codec> codec_;
 330 };
 331
 332 inline uint64_t oneBasedMsbPos(uint64_t number) {
 333   uint64_t pos = 0;
 334   for (; number > 0; ++pos, number >>= 1) {
 335   }
 336   return pos;
 337 }
 338
 339 void CompressionVarintTest::runSimpleTest(const DataHolder& dh) {
 340   auto original = IOBuf::wrapBuffer(dh.data(uncompressedLength_));
 341   auto compressed = codec_->compress(original.get());
 342   auto breakPoint =
 343       1UL +
 344       Random::rand64(
 345           std::max(uint64_t(9), oneBasedMsbPos(uncompressedLength_)) / 9UL);
 346   auto tinyBuf = IOBuf::copyBuffer(compressed->data(),
 347                                    std::min(compressed->length(), breakPoint));
 348   compressed->trimStart(breakPoint);
 349   tinyBuf->prependChain(std::move(compressed));
 350   compressed = std::move(tinyBuf);
 351
 352   auto uncompressed = codec_->uncompress(compressed.get());
 353
 354   EXPECT_EQ(uncompressedLength_, uncompressed->computeChainDataLength());
 355   EXPECT_EQ(dh.hash(uncompressedLength_), hashIOBuf(uncompressed.get()));
 356 }
 357
 358 TEST_P(CompressionVarintTest, RandomData) {
 359   runSimpleTest(randomDataHolder);
 360 }
 361
 362 TEST_P(CompressionVarintTest, ConstantData) {
 363   runSimpleTest(constantDataHolder);
 364 }
 365
 366 INSTANTIATE_TEST_CASE_P(
 367     CompressionVarintTest,
 368     CompressionVarintTest,
 369     testing::Combine(
 370         testing::Values(0, 1, 12, 22, 25, 27),
 371         testing::ValuesIn(supportedCodecs({
 372             CodecType::LZ4_VARINT_SIZE,
 373             CodecType::LZMA2_VARINT_SIZE,
 374         }))));
 375
 376 TEST(LZMATest, UncompressBadVarint) {
 377   if (hasStreamCodec(CodecType::LZMA2_VARINT_SIZE)) {
 378     std::string const str(kMaxVarintLength64 * 2, '\xff');
 379     ByteRange input((folly::StringPiece(str)));
 380     auto codec = getStreamCodec(CodecType::LZMA2_VARINT_SIZE);
 381     auto buffer = IOBuf::create(16);
 382     buffer->append(buffer->capacity());
 383     MutableByteRange output{buffer->writableData(), buffer->length()};
 384     EXPECT_THROW(codec->uncompressStream(input, output), std::runtime_error);
 385   }
 386 }
 387
 388 class CompressionCorruptionTest : public testing::TestWithParam<CodecType> {
 389  protected:
 390   void SetUp() override { codec_ = getCodec(GetParam()); }
 391
 392   void runSimpleTest(const DataHolder& dh);
 393
 394   std::unique_ptr<Codec> codec_;
 395 };
 396
 397 void CompressionCorruptionTest::runSimpleTest(const DataHolder& dh) {
 398   constexpr uint64_t uncompressedLength = 42;
 399   auto original = IOBuf::wrapBuffer(dh.data(uncompressedLength));
 400   auto compressed = codec_->compress(original.get());
 401
 402   if (!codec_->needsUncompressedLength()) {
 403     auto uncompressed = codec_->uncompress(compressed.get());
 404     EXPECT_EQ(uncompressedLength, uncompressed->computeChainDataLength());
 405     EXPECT_EQ(dh.hash(uncompressedLength), hashIOBuf(uncompressed.get()));
 406   }
 407   {
 408     auto uncompressed = codec_->uncompress(compressed.get(),
 409                                            uncompressedLength);
 410     EXPECT_EQ(uncompressedLength, uncompressed->computeChainDataLength());
 411     EXPECT_EQ(dh.hash(uncompressedLength), hashIOBuf(uncompressed.get()));
 412   }
 413
 414   EXPECT_THROW(codec_->uncompress(compressed.get(), uncompressedLength + 1),
 415                std::runtime_error);
 416
 417   auto corrupted = compressed->clone();
 418   corrupted->unshare();
 419   // Truncate the last character
 420   corrupted->prev()->trimEnd(1);
 421   if (!codec_->needsUncompressedLength()) {
 422     EXPECT_THROW(codec_->uncompress(corrupted.get()),
 423                  std::runtime_error);
 424   }
 425
 426   EXPECT_THROW(codec_->uncompress(corrupted.get(), uncompressedLength),
 427                std::runtime_error);
 428
 429   corrupted = compressed->clone();
 430   corrupted->unshare();
 431   // Corrupt the first character
 432   ++(corrupted->writableData()[0]);
 433
 434   if (!codec_->needsUncompressedLength()) {
 435     EXPECT_THROW(codec_->uncompress(corrupted.get()),
 436                  std::runtime_error);
 437   }
 438
 439   EXPECT_THROW(codec_->uncompress(corrupted.get(), uncompressedLength),
 440                std::runtime_error);
 441 }
 442
 443 TEST_P(CompressionCorruptionTest, RandomData) {
 444   runSimpleTest(randomDataHolder);
 445 }
 446
 447 TEST_P(CompressionCorruptionTest, ConstantData) {
 448   runSimpleTest(constantDataHolder);
 449 }
 450
 451 INSTANTIATE_TEST_CASE_P(
 452     CompressionCorruptionTest,
 453     CompressionCorruptionTest,
 454     testing::ValuesIn(
 455         // NO_COMPRESSION can't detect corruption
 456         // LZ4 can't detect corruption reliably (sigh)
 457         supportedCodecs({
 458             CodecType::SNAPPY,
 459             CodecType::ZLIB,
 460             CodecType::LZMA2,
 461             CodecType::ZSTD,
 462             CodecType::LZ4_FRAME,
 463             CodecType::BZIP2,
 464         })));
 465
 466 class StreamingUnitTest : public testing::TestWithParam<CodecType> {
 467  protected:
 468   void SetUp() override {
 469     codec_ = getStreamCodec(GetParam());
 470   }
 471
 472   std::unique_ptr<StreamCodec> codec_;
 473 };
 474
 475 TEST(StreamingUnitTest, needsDataLength) {
 476   static const struct {
 477     CodecType type;
 478     bool needsDataLength;
 479   } expectations[] = {
 480       {CodecType::ZLIB, false},
 481       {CodecType::GZIP, false},
 482       {CodecType::LZMA2, false},
 483       {CodecType::LZMA2_VARINT_SIZE, true},
 484       {CodecType::ZSTD, false},
 485   };
 486
 487   for (auto const& test : expectations) {
 488     if (hasStreamCodec(test.type)) {
 489       EXPECT_EQ(
 490           getStreamCodec(test.type)->needsDataLength(), test.needsDataLength);
 491     }
 492   }
 493 }
 494
 495 TEST_P(StreamingUnitTest, maxCompressedLength) {
 496   for (uint64_t const length : {1, 10, 100, 1000, 10000, 100000, 1000000}) {
 497     EXPECT_GE(codec_->maxCompressedLength(length), length);
 498   }
 499 }
 500
 501 TEST_P(StreamingUnitTest, getUncompressedLength) {
 502   auto const empty = IOBuf::create(0);
 503   EXPECT_EQ(uint64_t(0), codec_->getUncompressedLength(empty.get()));
 504   EXPECT_EQ(uint64_t(0), codec_->getUncompressedLength(empty.get(), 0));
 505   EXPECT_ANY_THROW(codec_->getUncompressedLength(empty.get(), 1));
 506
 507   auto const data = IOBuf::wrapBuffer(randomDataHolder.data(100));
 508   auto const compressed = codec_->compress(data.get());
 509
 510   if (auto const length = codec_->getUncompressedLength(data.get())) {
 511     EXPECT_EQ(100, *length);
 512   }
 513   EXPECT_EQ(uint64_t(100), codec_->getUncompressedLength(data.get(), 100));
 514   // If the uncompressed length is stored in the frame, then make sure it throws
 515   // when it is given the wrong length.
 516   if (codec_->getUncompressedLength(data.get()) == uint64_t(100)) {
 517     EXPECT_ANY_THROW(codec_->getUncompressedLength(data.get(), 200));
 518   }
 519 }
 520
 521 TEST_P(StreamingUnitTest, emptyData) {
 522   ByteRange input{};
 523   auto buffer = IOBuf::create(codec_->maxCompressedLength(0));
 524   buffer->append(buffer->capacity());
 525   MutableByteRange output;
 526
 527   // Test compressing empty data in one pass
 528   if (!codec_->needsDataLength()) {
 529     output = {buffer->writableData(), buffer->length()};
 530     EXPECT_TRUE(
 531         codec_->compressStream(input, output, StreamCodec::FlushOp::END));
 532   }
 533   codec_->resetStream(0);
 534   output = {buffer->writableData(), buffer->length()};
 535   EXPECT_TRUE(codec_->compressStream(input, output, StreamCodec::FlushOp::END));
 536
 537   // Test uncompressing the compressed empty data is equivalent to the empty
 538   // string
 539   {
 540     size_t compressedSize = buffer->length() - output.size();
 541     auto const compressed =
 542         IOBuf::copyBuffer(buffer->writableData(), compressedSize);
 543     auto inputRange = compressed->coalesce();
 544     codec_->resetStream(0);
 545     output = {buffer->writableData(), buffer->length()};
 546     EXPECT_TRUE(codec_->uncompressStream(
 547         inputRange, output, StreamCodec::FlushOp::END));
 548     EXPECT_EQ(output.size(), buffer->length());
 549   }
 550
 551   // Test compressing empty data with multiple calls to compressStream()
 552   {
 553     auto largeBuffer = IOBuf::create(codec_->maxCompressedLength(0) * 2);
 554     largeBuffer->append(largeBuffer->capacity());
 555     codec_->resetStream(0);
 556     output = {largeBuffer->writableData(), largeBuffer->length()};
 557     EXPECT_FALSE(codec_->compressStream(input, output));
 558     EXPECT_TRUE(
 559         codec_->compressStream(input, output, StreamCodec::FlushOp::FLUSH));
 560     EXPECT_TRUE(
 561         codec_->compressStream(input, output, StreamCodec::FlushOp::END));
 562   }
 563
 564   // Test uncompressing empty data
 565   output = {};
 566   codec_->resetStream();
 567   EXPECT_TRUE(codec_->uncompressStream(input, output));
 568   codec_->resetStream();
 569   EXPECT_TRUE(
 570       codec_->uncompressStream(input, output, StreamCodec::FlushOp::FLUSH));
 571   codec_->resetStream();
 572   EXPECT_TRUE(
 573       codec_->uncompressStream(input, output, StreamCodec::FlushOp::END));
 574   codec_->resetStream(0);
 575   EXPECT_TRUE(codec_->uncompressStream(input, output));
 576   codec_->resetStream(0);
 577   EXPECT_TRUE(
 578       codec_->uncompressStream(input, output, StreamCodec::FlushOp::FLUSH));
 579   codec_->resetStream(0);
 580   EXPECT_TRUE(
 581       codec_->uncompressStream(input, output, StreamCodec::FlushOp::END));
 582 }
 583
 584 TEST_P(StreamingUnitTest, noForwardProgress) {
 585   auto inBuffer = IOBuf::create(2);
 586   inBuffer->writableData()[0] = 'a';
 587   inBuffer->writableData()[1] = 'a';
 588   inBuffer->append(2);
 589   const auto compressed = codec_->compress(inBuffer.get());
 590   auto outBuffer = IOBuf::create(codec_->maxCompressedLength(2));
 591
 592   ByteRange emptyInput;
 593   MutableByteRange emptyOutput;
 594
 595   const std::array<StreamCodec::FlushOp, 3> flushOps = {{
 596       StreamCodec::FlushOp::NONE,
 597       StreamCodec::FlushOp::FLUSH,
 598       StreamCodec::FlushOp::END,
 599   }};
 600
 601   // No progress is not okay twice in a row for all flush operations when
 602   // compressing
 603   for (const auto flushOp : flushOps) {
 604     if (codec_->needsDataLength()) {
 605       codec_->resetStream(inBuffer->computeChainDataLength());
 606     } else {
 607       codec_->resetStream();
 608     }
 609     auto input = inBuffer->coalesce();
 610     MutableByteRange output = {outBuffer->writableTail(),
 611                                outBuffer->tailroom()};
 612     // Compress some data to avoid empty data special casing
 613     while (!input.empty()) {
 614       codec_->compressStream(input, output);
 615     }
 616     EXPECT_FALSE(codec_->compressStream(emptyInput, emptyOutput, flushOp));
 617     EXPECT_THROW(
 618         codec_->compressStream(emptyInput, emptyOutput, flushOp),
 619         std::runtime_error);
 620   }
 621
 622   // No progress is not okay twice in a row for all flush operations when
 623   // uncompressing
 624   for (const auto flushOp : flushOps) {
 625     codec_->resetStream();
 626     auto input = compressed->coalesce();
 627     // Remove the last byte so the operation is incomplete
 628     input.uncheckedSubtract(1);
 629     MutableByteRange output = {inBuffer->writableData(), inBuffer->length()};
 630     // Uncompress some data to avoid empty data special casing
 631     while (!input.empty()) {
 632       EXPECT_FALSE(codec_->uncompressStream(input, output));
 633     }
 634     EXPECT_FALSE(codec_->uncompressStream(emptyInput, emptyOutput, flushOp));
 635     EXPECT_THROW(
 636         codec_->uncompressStream(emptyInput, emptyOutput, flushOp),
 637         std::runtime_error);
 638   }
 639 }
 640
 641 TEST_P(StreamingUnitTest, stateTransitions) {
 642   auto inBuffer = IOBuf::create(2);
 643   inBuffer->writableData()[0] = 'a';
 644   inBuffer->writableData()[1] = 'a';
 645   inBuffer->append(2);
 646   auto compressed = codec_->compress(inBuffer.get());
 647   ByteRange const in = compressed->coalesce();
 648   auto outBuffer = IOBuf::create(codec_->maxCompressedLength(in.size()));
 649   MutableByteRange const out{outBuffer->writableTail(), outBuffer->tailroom()};
 650
 651   auto compress = [&](
 652       StreamCodec::FlushOp flushOp = StreamCodec::FlushOp::NONE,
 653       bool empty = false) {
 654     auto input = in;
 655     auto output = empty ? MutableByteRange{} : out;
 656     return codec_->compressStream(input, output, flushOp);
 657   };
 658   auto compress_all = [&](bool expect,
 659                           StreamCodec::FlushOp flushOp =
 660                               StreamCodec::FlushOp::NONE,
 661                           bool empty = false) {
 662     auto input = in;
 663     auto output = empty ? MutableByteRange{} : out;
 664     while (!input.empty()) {
 665       if (expect) {
 666         EXPECT_TRUE(codec_->compressStream(input, output, flushOp));
 667       } else {
 668         EXPECT_FALSE(codec_->compressStream(input, output, flushOp));
 669       }
 670     }
 671   };
 672   auto uncompress = [&](
 673       StreamCodec::FlushOp flushOp = StreamCodec::FlushOp::NONE,
 674       bool empty = false) {
 675     auto input = in;
 676     auto output = empty ? MutableByteRange{} : out;
 677     return codec_->uncompressStream(input, output, flushOp);
 678   };
 679
 680   // compression flow
 681   if (!codec_->needsDataLength()) {
 682     codec_->resetStream();
 683     EXPECT_FALSE(compress());
 684     EXPECT_FALSE(compress());
 685     EXPECT_TRUE(compress(StreamCodec::FlushOp::FLUSH));
 686     EXPECT_FALSE(compress());
 687     EXPECT_TRUE(compress(StreamCodec::FlushOp::END));
 688   }
 689   codec_->resetStream(in.size() * 5);
 690   compress_all(false);
 691   compress_all(false);
 692   compress_all(true, StreamCodec::FlushOp::FLUSH);
 693   compress_all(false);
 694   compress_all(true, StreamCodec::FlushOp::END);
 695
 696   // uncompression flow
 697   codec_->resetStream();
 698   EXPECT_FALSE(uncompress(StreamCodec::FlushOp::NONE, true));
 699   codec_->resetStream();
 700   EXPECT_FALSE(uncompress(StreamCodec::FlushOp::FLUSH, true));
 701   codec_->resetStream();
 702   EXPECT_FALSE(uncompress(StreamCodec::FlushOp::NONE, true));
 703   codec_->resetStream();
 704   EXPECT_FALSE(uncompress(StreamCodec::FlushOp::NONE, true));
 705   codec_->resetStream();
 706   EXPECT_TRUE(uncompress(StreamCodec::FlushOp::FLUSH));
 707   // compress -> uncompress
 708   codec_->resetStream(in.size());
 709   EXPECT_FALSE(compress());
 710   EXPECT_THROW(uncompress(), std::logic_error);
 711   // uncompress -> compress
 712   codec_->resetStream(inBuffer->computeChainDataLength());
 713   EXPECT_TRUE(uncompress(StreamCodec::FlushOp::FLUSH));
 714   EXPECT_THROW(compress(), std::logic_error);
 715   // end -> compress
 716   if (!codec_->needsDataLength()) {
 717     codec_->resetStream();
 718     EXPECT_FALSE(compress());
 719     EXPECT_TRUE(compress(StreamCodec::FlushOp::END));
 720     EXPECT_THROW(compress(), std::logic_error);
 721   }
 722   codec_->resetStream(in.size() * 2);
 723   compress_all(false);
 724   compress_all(true, StreamCodec::FlushOp::END);
 725   EXPECT_THROW(compress(), std::logic_error);
 726   // end -> uncompress
 727   codec_->resetStream();
 728   EXPECT_TRUE(uncompress(StreamCodec::FlushOp::FLUSH));
 729   EXPECT_THROW(uncompress(), std::logic_error);
 730   // flush -> compress
 731   codec_->resetStream(in.size());
 732   EXPECT_FALSE(compress(StreamCodec::FlushOp::FLUSH, true));
 733   EXPECT_THROW(compress(), std::logic_error);
 734   // flush -> end
 735   codec_->resetStream(in.size());
 736   EXPECT_FALSE(compress(StreamCodec::FlushOp::FLUSH, true));
 737   EXPECT_THROW(compress(StreamCodec::FlushOp::END), std::logic_error);
 738   // undefined -> compress
 739   codec_->compress(inBuffer.get());
 740   EXPECT_THROW(compress(), std::logic_error);
 741   codec_->uncompress(compressed.get(), inBuffer->computeChainDataLength());
 742   EXPECT_THROW(compress(), std::logic_error);
 743   // undefined -> undefined
 744   codec_->uncompress(compressed.get());
 745   codec_->compress(inBuffer.get());
 746 }
 747
 748 INSTANTIATE_TEST_CASE_P(
 749     StreamingUnitTest,
 750     StreamingUnitTest,
 751     testing::ValuesIn(availableStreamCodecs()));
 752
 753 class StreamingCompressionTest
 754     : public testing::TestWithParam<std::tuple<int, int, CodecType>> {
 755  protected:
 756   void SetUp() override {
 757     auto const tup = GetParam();
 758     uncompressedLength_ = uint64_t(1) << std::get<0>(tup);
 759     chunkSize_ = size_t(1) << std::get<1>(tup);
 760     codec_ = getStreamCodec(std::get<2>(tup));
 761   }
 762
 763   void runResetStreamTest(DataHolder const& dh);
 764   void runCompressStreamTest(DataHolder const& dh);
 765   void runUncompressStreamTest(DataHolder const& dh);
 766   void runFlushTest(DataHolder const& dh);
 767
 768  private:
 769   std::vector<ByteRange> split(ByteRange data) const;
 770
 771   uint64_t uncompressedLength_;
 772   size_t chunkSize_;
 773   std::unique_ptr<StreamCodec> codec_;
 774 };
 775
 776 std::vector<ByteRange> StreamingCompressionTest::split(ByteRange data) const {
 777   size_t const pieces = std::max<size_t>(1, data.size() / chunkSize_);
 778   std::vector<ByteRange> result;
 779   result.reserve(pieces + 1);
 780   while (!data.empty()) {
 781     size_t const pieceSize = std::min(data.size(), chunkSize_);
 782     result.push_back(data.subpiece(0, pieceSize));
 783     data.uncheckedAdvance(pieceSize);
 784   }
 785   return result;
 786 }
 787
 788 static std::unique_ptr<IOBuf> compressSome(
 789     StreamCodec* codec,
 790     ByteRange data,
 791     uint64_t bufferSize,
 792     StreamCodec::FlushOp flush) {
 793   bool result;
 794   IOBufQueue queue;
 795   do {
 796     auto buffer = IOBuf::create(bufferSize);
 797     buffer->append(buffer->capacity());
 798     MutableByteRange output{buffer->writableData(), buffer->length()};
 799
 800     result = codec->compressStream(data, output, flush);
 801     buffer->trimEnd(output.size());
 802     queue.append(std::move(buffer));
 803
 804   } while (!(flush == StreamCodec::FlushOp::NONE && data.empty()) && !result);
 805   EXPECT_TRUE(data.empty());
 806   return queue.move();
 807 }
 808
 809 static std::pair<bool, std::unique_ptr<IOBuf>> uncompressSome(
 810     StreamCodec* codec,
 811     ByteRange& data,
 812     uint64_t bufferSize,
 813     StreamCodec::FlushOp flush) {
 814   bool result;
 815   IOBufQueue queue;
 816   do {
 817     auto buffer = IOBuf::create(bufferSize);
 818     buffer->append(buffer->capacity());
 819     MutableByteRange output{buffer->writableData(), buffer->length()};
 820
 821     result = codec->uncompressStream(data, output, flush);
 822     buffer->trimEnd(output.size());
 823     queue.append(std::move(buffer));
 824
 825   } while (queue.tailroom() == 0 && !result);
 826   return std::make_pair(result, queue.move());
 827 }
 828
 829 void StreamingCompressionTest::runResetStreamTest(DataHolder const& dh) {
 830   auto const input = dh.data(uncompressedLength_);
 831   // Compress some but leave state unclean
 832   codec_->resetStream(uncompressedLength_);
 833   compressSome(codec_.get(), input, chunkSize_, StreamCodec::FlushOp::NONE);
 834   // Reset stream and compress all
 835   if (codec_->needsDataLength()) {
 836     codec_->resetStream(uncompressedLength_);
 837   } else {
 838     codec_->resetStream();
 839   }
 840   auto compressed =
 841       compressSome(codec_.get(), input, chunkSize_, StreamCodec::FlushOp::END);
 842   auto const uncompressed = codec_->uncompress(compressed.get(), input.size());
 843   EXPECT_EQ(dh.hash(uncompressedLength_), hashIOBuf(uncompressed.get()));
 844 }
 845
 846 TEST_P(StreamingCompressionTest, resetStream) {
 847   runResetStreamTest(constantDataHolder);
 848   runResetStreamTest(randomDataHolder);
 849 }
 850
 851 void StreamingCompressionTest::runCompressStreamTest(
 852     const folly::io::test::DataHolder& dh) {
 853   auto const inputs = split(dh.data(uncompressedLength_));
 854
 855   IOBufQueue queue;
 856   codec_->resetStream(uncompressedLength_);
 857   // Compress many inputs in a row
 858   for (auto const input : inputs) {
 859     queue.append(compressSome(
 860         codec_.get(), input, chunkSize_, StreamCodec::FlushOp::NONE));
 861   }
 862   // Finish the operation with empty input.
 863   ByteRange empty;
 864   queue.append(
 865       compressSome(codec_.get(), empty, chunkSize_, StreamCodec::FlushOp::END));
 866
 867   auto const uncompressed = codec_->uncompress(queue.front());
 868   EXPECT_EQ(dh.hash(uncompressedLength_), hashIOBuf(uncompressed.get()));
 869 }
 870
 871 TEST_P(StreamingCompressionTest, compressStream) {
 872   runCompressStreamTest(constantDataHolder);
 873   runCompressStreamTest(randomDataHolder);
 874 }
 875
 876 void StreamingCompressionTest::runUncompressStreamTest(
 877     const folly::io::test::DataHolder& dh) {
 878   auto const data = IOBuf::wrapBuffer(dh.data(uncompressedLength_));
 879   // Concatenate 3 compressed frames in a row
 880   auto compressed = codec_->compress(data.get());
 881   compressed->prependChain(codec_->compress(data.get()));
 882   compressed->prependChain(codec_->compress(data.get()));
 883   // Pass all 3 compressed frames in one input buffer
 884   auto input = compressed->coalesce();
 885   // Uncompress the first frame
 886   codec_->resetStream(data->computeChainDataLength());
 887   {
 888     auto const result = uncompressSome(
 889         codec_.get(), input, chunkSize_, StreamCodec::FlushOp::FLUSH);
 890     ASSERT_TRUE(result.first);
 891     ASSERT_EQ(hashIOBuf(data.get()), hashIOBuf(result.second.get()));
 892   }
 893   // Uncompress the second frame
 894   codec_->resetStream();
 895   {
 896     auto const result = uncompressSome(
 897         codec_.get(), input, chunkSize_, StreamCodec::FlushOp::END);
 898     ASSERT_TRUE(result.first);
 899     ASSERT_EQ(hashIOBuf(data.get()), hashIOBuf(result.second.get()));
 900   }
 901   // Uncompress the third frame
 902   codec_->resetStream();
 903   {
 904     auto const result = uncompressSome(
 905         codec_.get(), input, chunkSize_, StreamCodec::FlushOp::FLUSH);
 906     ASSERT_TRUE(result.first);
 907     ASSERT_EQ(hashIOBuf(data.get()), hashIOBuf(result.second.get()));
 908   }
 909   EXPECT_TRUE(input.empty());
 910 }
 911
 912 TEST_P(StreamingCompressionTest, uncompressStream) {
 913   runUncompressStreamTest(constantDataHolder);
 914   runUncompressStreamTest(randomDataHolder);
 915 }
 916
 917 void StreamingCompressionTest::runFlushTest(DataHolder const& dh) {
 918   auto const inputs = split(dh.data(uncompressedLength_));
 919   auto uncodec = getStreamCodec(codec_->type());
 920
 921   if (codec_->needsDataLength()) {
 922     codec_->resetStream(uncompressedLength_);
 923   } else {
 924     codec_->resetStream();
 925   }
 926   for (auto input : inputs) {
 927     // Compress some data and flush the stream
 928     auto compressed = compressSome(
 929         codec_.get(), input, chunkSize_, StreamCodec::FlushOp::FLUSH);
 930     auto compressedRange = compressed->coalesce();
 931     // Uncompress the compressed data
 932     auto result = uncompressSome(
 933         uncodec.get(),
 934         compressedRange,
 935         chunkSize_,
 936         StreamCodec::FlushOp::FLUSH);
 937     // All compressed data should have been consumed
 938     EXPECT_TRUE(compressedRange.empty());
 939     // The frame isn't complete
 940     EXPECT_FALSE(result.first);
 941     // The uncompressed data should be exactly the input data
 942     EXPECT_EQ(input.size(), result.second->computeChainDataLength());
 943     auto const data = IOBuf::wrapBuffer(input);
 944     EXPECT_EQ(hashIOBuf(data.get()), hashIOBuf(result.second.get()));
 945   }
 946 }
 947
 948 TEST_P(StreamingCompressionTest, testFlush) {
 949   runFlushTest(constantDataHolder);
 950   runFlushTest(randomDataHolder);
 951 }
 952
 953 INSTANTIATE_TEST_CASE_P(
 954     StreamingCompressionTest,
 955     StreamingCompressionTest,
 956     testing::Combine(
 957         testing::Values(0, 1, 12, 22, 27),
 958         testing::Values(12, 17, 20),
 959         testing::ValuesIn(availableStreamCodecs())));
 960
 961 class AutomaticCodecTest : public testing::TestWithParam<CodecType> {
 962  protected:
 963   void SetUp() override {
 964     codec_ = getCodec(GetParam());
 965     auto_ = getAutoUncompressionCodec();
 966   }
 967
 968   void runSimpleTest(const DataHolder& dh);
 969
 970   std::unique_ptr<Codec> codec_;
 971   std::unique_ptr<Codec> auto_;
 972 };
 973
 974 void AutomaticCodecTest::runSimpleTest(const DataHolder& dh) {
 975   constexpr uint64_t uncompressedLength = 1000;
 976   auto original = IOBuf::wrapBuffer(dh.data(uncompressedLength));
 977   auto compressed = codec_->compress(original.get());
 978
 979   if (!codec_->needsUncompressedLength()) {
 980     auto uncompressed = auto_->uncompress(compressed.get());
 981     EXPECT_EQ(uncompressedLength, uncompressed->computeChainDataLength());
 982     EXPECT_EQ(dh.hash(uncompressedLength), hashIOBuf(uncompressed.get()));
 983   }
 984   {
 985     auto uncompressed = auto_->uncompress(compressed.get(), uncompressedLength);
 986     EXPECT_EQ(uncompressedLength, uncompressed->computeChainDataLength());
 987     EXPECT_EQ(dh.hash(uncompressedLength), hashIOBuf(uncompressed.get()));
 988   }
 989   ASSERT_GE(compressed->computeChainDataLength(), 8);
 990   for (size_t i = 0; i < 8; ++i) {
 991     auto split = compressed->clone();
 992     auto rest = compressed->clone();
 993     split->trimEnd(split->length() - i);
 994     rest->trimStart(i);
 995     split->appendChain(std::move(rest));
 996     auto uncompressed = auto_->uncompress(split.get(), uncompressedLength);
 997     EXPECT_EQ(uncompressedLength, uncompressed->computeChainDataLength());
 998     EXPECT_EQ(dh.hash(uncompressedLength), hashIOBuf(uncompressed.get()));
 999   }
1000 }
1001
1002 TEST_P(AutomaticCodecTest, RandomData) {
1003   runSimpleTest(randomDataHolder);
1004 }
1005
1006 TEST_P(AutomaticCodecTest, ConstantData) {
1007   runSimpleTest(constantDataHolder);
1008 }
1009
1010 TEST_P(AutomaticCodecTest, ValidPrefixes) {
1011   const auto prefixes = codec_->validPrefixes();
1012   for (const auto& prefix : prefixes) {
1013     EXPECT_FALSE(prefix.empty());
1014     // Ensure that all strings are at least 8 bytes for LZMA2.
1015     // The bytes after the prefix should be ignored by `canUncompress()`.
1016     IOBuf data{IOBuf::COPY_BUFFER, prefix, 0, 8};
1017     data.append(8);
1018     EXPECT_TRUE(codec_->canUncompress(&data));
1019     EXPECT_TRUE(auto_->canUncompress(&data));
1020   }
1021 }
1022
1023 TEST_P(AutomaticCodecTest, NeedsUncompressedLength) {
1024   if (codec_->needsUncompressedLength()) {
1025     EXPECT_TRUE(auto_->needsUncompressedLength());
1026   }
1027 }
1028
1029 TEST_P(AutomaticCodecTest, maxUncompressedLength) {
1030   EXPECT_LE(codec_->maxUncompressedLength(), auto_->maxUncompressedLength());
1031 }
1032
1033 TEST_P(AutomaticCodecTest, DefaultCodec) {
1034   const uint64_t length = 42;
1035   std::vector<std::unique_ptr<Codec>> codecs;
1036   codecs.push_back(getCodec(CodecType::ZSTD));
1037   auto automatic = getAutoUncompressionCodec(std::move(codecs));
1038   auto original = IOBuf::wrapBuffer(constantDataHolder.data(length));
1039   auto compressed = codec_->compress(original.get());
1040   auto decompressed = automatic->uncompress(compressed.get());
1041
1042   EXPECT_EQ(constantDataHolder.hash(length), hashIOBuf(decompressed.get()));
1043 }
1044
1045 namespace {
1046 class CustomCodec : public Codec {
1047  public:
1048   static std::unique_ptr<Codec> create(std::string prefix, CodecType type) {
1049     return std::make_unique<CustomCodec>(std::move(prefix), type);
1050   }
1051   explicit CustomCodec(std::string prefix, CodecType type)
1052       : Codec(CodecType::USER_DEFINED),
1053         prefix_(std::move(prefix)),
1054         codec_(getCodec(type)) {}
1055
1056  private:
1057   std::vector<std::string> validPrefixes() const override {
1058     return {prefix_};
1059   }
1060
1061   uint64_t doMaxCompressedLength(uint64_t uncompressedLength) const override {
1062     return codec_->maxCompressedLength(uncompressedLength) + prefix_.size();
1063   }
1064
1065   bool canUncompress(const IOBuf* data, Optional<uint64_t>) const override {
1066     auto clone = data->cloneCoalescedAsValue();
1067     if (clone.length() < prefix_.size()) {
1068       return false;
1069     }
1070     return memcmp(clone.data(), prefix_.data(), prefix_.size()) == 0;
1071   }
1072
1073   std::unique_ptr<IOBuf> doCompress(const IOBuf* data) override {
1074     auto result = IOBuf::copyBuffer(prefix_);
1075     result->appendChain(codec_->compress(data));
1076     EXPECT_TRUE(canUncompress(result.get(), data->computeChainDataLength()));
1077     return result;
1078   }
1079
1080   std::unique_ptr<IOBuf> doUncompress(
1081       const IOBuf* data,
1082       Optional<uint64_t> uncompressedLength) override {
1083     EXPECT_TRUE(canUncompress(data, uncompressedLength));
1084     auto clone = data->cloneCoalescedAsValue();
1085     clone.trimStart(prefix_.size());
1086     return codec_->uncompress(&clone, uncompressedLength);
1087   }
1088
1089   std::string prefix_;
1090   std::unique_ptr<Codec> codec_;
1091 };
1092 }
1093
1094 TEST_P(AutomaticCodecTest, CustomCodec) {
1095   const uint64_t length = 42;
1096   auto ab = CustomCodec::create("ab", CodecType::ZSTD);
1097   std::vector<std::unique_ptr<Codec>> codecs;
1098   codecs.push_back(CustomCodec::create("ab", CodecType::ZSTD));
1099   auto automatic = getAutoUncompressionCodec(std::move(codecs));
1100   auto original = IOBuf::wrapBuffer(constantDataHolder.data(length));
1101
1102   auto abCompressed = ab->compress(original.get());
1103   auto abDecompressed = automatic->uncompress(abCompressed.get());
1104   EXPECT_TRUE(automatic->canUncompress(abCompressed.get()));
1105   EXPECT_FALSE(auto_->canUncompress(abCompressed.get()));
1106   EXPECT_EQ(constantDataHolder.hash(length), hashIOBuf(abDecompressed.get()));
1107
1108   auto compressed = codec_->compress(original.get());
1109   auto decompressed = automatic->uncompress(compressed.get());
1110   EXPECT_EQ(constantDataHolder.hash(length), hashIOBuf(decompressed.get()));
1111 }
1112
1113 TEST_P(AutomaticCodecTest, CustomDefaultCodec) {
1114   const uint64_t length = 42;
1115   auto none = CustomCodec::create("none", CodecType::NO_COMPRESSION);
1116   std::vector<std::unique_ptr<Codec>> codecs;
1117   codecs.push_back(CustomCodec::create("none", CodecType::NO_COMPRESSION));
1118   codecs.push_back(getCodec(CodecType::LZ4_FRAME));
1119   auto automatic = getAutoUncompressionCodec(std::move(codecs));
1120   auto original = IOBuf::wrapBuffer(constantDataHolder.data(length));
1121
1122   auto noneCompressed = none->compress(original.get());
1123   auto noneDecompressed = automatic->uncompress(noneCompressed.get());
1124   EXPECT_TRUE(automatic->canUncompress(noneCompressed.get()));
1125   EXPECT_FALSE(auto_->canUncompress(noneCompressed.get()));
1126   EXPECT_EQ(constantDataHolder.hash(length), hashIOBuf(noneDecompressed.get()));
1127
1128   auto compressed = codec_->compress(original.get());
1129   auto decompressed = automatic->uncompress(compressed.get());
1130   EXPECT_EQ(constantDataHolder.hash(length), hashIOBuf(decompressed.get()));
1131 }
1132
1133 TEST_P(AutomaticCodecTest, canUncompressOneBytes) {
1134   // No default codec can uncompress 1 bytes.
1135   IOBuf buf{IOBuf::CREATE, 1};
1136   buf.append(1);
1137   EXPECT_FALSE(codec_->canUncompress(&buf, 1));
1138   EXPECT_FALSE(codec_->canUncompress(&buf, folly::none));
1139   EXPECT_FALSE(auto_->canUncompress(&buf, 1));
1140   EXPECT_FALSE(auto_->canUncompress(&buf, folly::none));
1141 }
1142
1143 INSTANTIATE_TEST_CASE_P(
1144     AutomaticCodecTest,
1145     AutomaticCodecTest,
1146     testing::Values(
1147         CodecType::LZ4_FRAME,
1148         CodecType::ZSTD,
1149         CodecType::ZLIB,
1150         CodecType::GZIP,
1151         CodecType::LZMA2,
1152         CodecType::BZIP2));
1153
1154 TEST(ValidPrefixesTest, CustomCodec) {
1155   std::vector<std::unique_ptr<Codec>> codecs;
1156   codecs.push_back(CustomCodec::create("none", CodecType::NO_COMPRESSION));
1157   const auto none = getAutoUncompressionCodec(std::move(codecs));
1158   const auto prefixes = none->validPrefixes();
1159   const auto it = std::find(prefixes.begin(), prefixes.end(), "none");
1160   EXPECT_TRUE(it != prefixes.end());
1161 }
1162
1163 #define EXPECT_THROW_IF_DEBUG(statement, expected_exception) \
1164   do {                                                       \
1165     if (kIsDebug) {                                          \
1166       EXPECT_THROW((statement), expected_exception);         \
1167     } else {                                                 \
1168       EXPECT_NO_THROW((statement));                          \
1169     }                                                        \
1170   } while (false)
1171
1172 TEST(CheckCompatibleTest, SimplePrefixSecond) {
1173   std::vector<std::unique_ptr<Codec>> codecs;
1174   codecs.push_back(CustomCodec::create("abc", CodecType::NO_COMPRESSION));
1175   codecs.push_back(CustomCodec::create("ab", CodecType::NO_COMPRESSION));
1176   EXPECT_THROW_IF_DEBUG(
1177       getAutoUncompressionCodec(std::move(codecs)), std::invalid_argument);
1178 }
1179
1180 TEST(CheckCompatibleTest, SimplePrefixFirst) {
1181   std::vector<std::unique_ptr<Codec>> codecs;
1182   codecs.push_back(CustomCodec::create("ab", CodecType::NO_COMPRESSION));
1183   codecs.push_back(CustomCodec::create("abc", CodecType::NO_COMPRESSION));
1184   EXPECT_THROW_IF_DEBUG(
1185       getAutoUncompressionCodec(std::move(codecs)), std::invalid_argument);
1186 }
1187
1188 TEST(CheckCompatibleTest, Empty) {
1189   std::vector<std::unique_ptr<Codec>> codecs;
1190   codecs.push_back(CustomCodec::create("", CodecType::NO_COMPRESSION));
1191   EXPECT_THROW_IF_DEBUG(
1192       getAutoUncompressionCodec(std::move(codecs)), std::invalid_argument);
1193 }
1194
1195 TEST(CheckCompatibleTest, ZstdPrefix) {
1196   std::vector<std::unique_ptr<Codec>> codecs;
1197   codecs.push_back(CustomCodec::create("\x28\xB5\x2F", CodecType::ZSTD));
1198   EXPECT_THROW_IF_DEBUG(
1199       getAutoUncompressionCodec(std::move(codecs)), std::invalid_argument);
1200 }
1201
1202 TEST(CheckCompatibleTest, ZstdDuplicate) {
1203   std::vector<std::unique_ptr<Codec>> codecs;
1204   codecs.push_back(CustomCodec::create("\x28\xB5\x2F\xFD", CodecType::ZSTD));
1205   EXPECT_THROW_IF_DEBUG(
1206       getAutoUncompressionCodec(std::move(codecs)), std::invalid_argument);
1207 }
1208
1209 TEST(CheckCompatibleTest, ZlibIsPrefix) {
1210   std::vector<std::unique_ptr<Codec>> codecs;
1211   codecs.push_back(CustomCodec::create("\x18\x76zzasdf", CodecType::ZSTD));
1212   EXPECT_THROW_IF_DEBUG(
1213       getAutoUncompressionCodec(std::move(codecs)), std::invalid_argument);
1214 }
1215
1216 #if FOLLY_HAVE_LIBZSTD
1217
1218 TEST(ZstdTest, BackwardCompatible) {
1219   auto codec = getCodec(CodecType::ZSTD);
1220   {
1221     auto const data = IOBuf::wrapBuffer(randomDataHolder.data(size_t(1) << 20));
1222     auto compressed = codec->compress(data.get());
1223     compressed->coalesce();
1224     EXPECT_EQ(
1225         data->length(),
1226         ZSTD_getDecompressedSize(compressed->data(), compressed->length()));
1227   }
1228   {
1229     auto const data =
1230         IOBuf::wrapBuffer(randomDataHolder.data(size_t(100) << 20));
1231     auto compressed = codec->compress(data.get());
1232     compressed->coalesce();
1233     EXPECT_EQ(
1234         data->length(),
1235         ZSTD_getDecompressedSize(compressed->data(), compressed->length()));
1236   }
1237 }
1238
1239 #endif
1240
1241 #if FOLLY_HAVE_LIBZ
1242
1243 using ZlibFormat = zlib::Options::Format;
1244
1245 TEST(ZlibTest, Auto) {
1246   size_t const uncompressedLength_ = (size_t)1 << 15;
1247   auto const original = std::string(
1248       reinterpret_cast<const char*>(
1249           randomDataHolder.data(uncompressedLength_).data()),
1250       uncompressedLength_);
1251   auto optionCodec = zlib::getCodec(zlib::Options(ZlibFormat::AUTO));
1252
1253   // Test the codec can uncompress zlib data.
1254   {
1255     auto codec = getCodec(CodecType::ZLIB);
1256     auto const compressed = codec->compress(original);
1257     auto const uncompressed = optionCodec->uncompress(compressed);
1258     EXPECT_EQ(original, uncompressed);
1259   }
1260
1261   // Test the codec can uncompress gzip data.
1262   {
1263     auto codec = getCodec(CodecType::GZIP);
1264     auto const compressed = codec->compress(original);
1265     auto const uncompressed = optionCodec->uncompress(compressed);
1266     EXPECT_EQ(original, uncompressed);
1267   }
1268 }
1269
1270 TEST(ZlibTest, DefaultOptions) {
1271   size_t const uncompressedLength_ = (size_t)1 << 20;
1272   auto const original = std::string(
1273       reinterpret_cast<const char*>(
1274           randomDataHolder.data(uncompressedLength_).data()),
1275       uncompressedLength_);
1276   {
1277     auto codec = getCodec(CodecType::ZLIB);
1278     auto optionCodec = zlib::getCodec(zlib::defaultZlibOptions());
1279     auto const compressed = optionCodec->compress(original);
1280     auto uncompressed = codec->uncompress(compressed);
1281     EXPECT_EQ(original, uncompressed);
1282     uncompressed = optionCodec->uncompress(compressed);
1283     EXPECT_EQ(original, uncompressed);
1284   }
1285
1286   {
1287     auto codec = getCodec(CodecType::GZIP);
1288     auto optionCodec = zlib::getCodec(zlib::defaultGzipOptions());
1289     auto const compressed = optionCodec->compress(original);
1290     auto uncompressed = codec->uncompress(compressed);
1291     EXPECT_EQ(original, uncompressed);
1292     uncompressed = optionCodec->uncompress(compressed);
1293     EXPECT_EQ(original, uncompressed);
1294   }
1295 }
1296
1297 class ZlibOptionsTest : public testing::TestWithParam<
1298                             std::tr1::tuple<ZlibFormat, int, int, int>> {
1299  protected:
1300   void SetUp() override {
1301     auto tup = GetParam();
1302     options_.format = std::tr1::get<0>(tup);
1303     options_.windowSize = std::tr1::get<1>(tup);
1304     options_.memLevel = std::tr1::get<2>(tup);
1305     options_.strategy = std::tr1::get<3>(tup);
1306     codec_ = zlib::getStreamCodec(options_);
1307   }
1308
1309   void runSimpleRoundTripTest(const DataHolder& dh);
1310
1311  private:
1312   zlib::Options options_;
1313   std::unique_ptr<StreamCodec> codec_;
1314 };
1315
1316 void ZlibOptionsTest::runSimpleRoundTripTest(const DataHolder& dh) {
1317   size_t const uncompressedLength = (size_t)1 << 16;
1318   auto const original = std::string(
1319       reinterpret_cast<const char*>(dh.data(uncompressedLength).data()),
1320       uncompressedLength);
1321
1322   auto const compressed = codec_->compress(original);
1323   auto const uncompressed = codec_->uncompress(compressed);
1324   EXPECT_EQ(uncompressed, original);
1325 }
1326
1327 TEST_P(ZlibOptionsTest, simpleRoundTripTest) {
1328   runSimpleRoundTripTest(constantDataHolder);
1329   runSimpleRoundTripTest(randomDataHolder);
1330 }
1331
1332 INSTANTIATE_TEST_CASE_P(
1333     ZlibOptionsTest,
1334     ZlibOptionsTest,
1335     testing::Combine(
1336         testing::Values(
1337             ZlibFormat::ZLIB,
1338             ZlibFormat::GZIP,
1339             ZlibFormat::RAW,
1340             ZlibFormat::AUTO),
1341         testing::Values(9, 12, 15),
1342         testing::Values(1, 8, 9),
1343         testing::Values(
1344             Z_DEFAULT_STRATEGY,
1345             Z_FILTERED,
1346             Z_HUFFMAN_ONLY,
1347             Z_RLE,
1348             Z_FIXED)));
1349
1350 #endif // FOLLY_HAVE_LIBZ
1351
1352 } // namespace test
1353 } // namespace io
1354 } // namespace folly
1355
1356 int main(int argc, char *argv[]) {
1357   testing::InitGoogleTest(&argc, argv);
1358   gflags::ParseCommandLineFlags(&argc, &argv, true);
1359
1360   auto ret = RUN_ALL_TESTS();
1361   if (!ret) {
1362     folly::runBenchmarksOnFlag();
1363   }
1364   return ret;
1365 }