| // Copyright 2018 The Fuchsia 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 <stdlib.h> |
| |
| #include <algorithm> |
| #include <memory> |
| |
| #include <blobfs/compression/blob-compressor.h> |
| #include <blobfs/compression/compressor.h> |
| #include <blobfs/compression/lz4.h> |
| #include <blobfs/compression/zstd.h> |
| #include <zircon/assert.h> |
| #include <zxtest/zxtest.h> |
| |
| namespace blobfs { |
| namespace { |
| |
| enum class DataType { |
| Compressible, |
| Random, |
| }; |
| |
| std::unique_ptr<char[]> GenerateInput(DataType data_type, unsigned seed, size_t size) { |
| std::unique_ptr<char[]> input(new char[size]); |
| switch (data_type) { |
| case DataType::Compressible: { |
| size_t i = 0; |
| while (i < size) { |
| size_t run_length = 1 + (rand_r(&seed) % (size - i)); |
| char value = static_cast<char>(rand_r(&seed) % std::numeric_limits<char>::max()); |
| memset(input.get() + i, value, run_length); |
| i += run_length; |
| } |
| break; |
| } |
| case DataType::Random: |
| for (size_t i = 0; i < size; i++) { |
| input[i] = static_cast<char>(rand_r(&seed)); |
| } |
| break; |
| default: |
| ADD_FAILURE("Bad Data Type"); |
| } |
| return input; |
| } |
| |
| void CompressionHelper(CompressionAlgorithm algorithm, const char* input, size_t size, size_t step, |
| std::optional<BlobCompressor>* out) { |
| auto compressor = BlobCompressor::Create(algorithm, size); |
| ASSERT_TRUE(compressor); |
| |
| size_t offset = 0; |
| while (offset != size) { |
| const void* data = reinterpret_cast<void*>(reinterpret_cast<uintptr_t>(input) + offset); |
| const size_t incremental_size = std::min(step, size - offset); |
| ASSERT_EQ(ZX_OK, compressor->Update(data, incremental_size)); |
| offset += incremental_size; |
| } |
| ASSERT_EQ(ZX_OK, compressor->End()); |
| EXPECT_GT(compressor->Size(), 0); |
| |
| *out = std::move(compressor); |
| } |
| |
| void DecompressionHelper(CompressionAlgorithm algorithm, |
| const void* compressed, size_t compressed_size, |
| const void* expected, size_t expected_size) { |
| std::unique_ptr<char[]> output(new char[expected_size]); |
| size_t target_size = expected_size; |
| size_t src_size = compressed_size; |
| switch (algorithm) { |
| case CompressionAlgorithm::LZ4: |
| ASSERT_EQ(ZX_OK, LZ4Decompress(output.get(), &target_size, compressed, &src_size)); |
| break; |
| case CompressionAlgorithm::ZSTD: |
| ASSERT_EQ(ZX_OK, ZSTDDecompress(output.get(), &target_size, compressed, &src_size)); |
| break; |
| default: |
| ASSERT_TRUE(false, "Bad algorithm"); |
| } |
| EXPECT_EQ(expected_size, target_size); |
| EXPECT_EQ(compressed_size, src_size); |
| EXPECT_EQ(0, memcmp(expected, output.get(), expected_size)); |
| } |
| |
| // Tests a contained case of compression and decompression. |
| // |
| // size: The size of the input buffer. |
| // step: The step size of updating the compression buffer. |
| void RunCompressDecompressTest(CompressionAlgorithm algorithm, DataType data_type, size_t size, |
| size_t step) { |
| ASSERT_LE(step, size, "Step size too large"); |
| |
| // Generate input. |
| std::unique_ptr<char[]> input(GenerateInput(data_type, 0, size)); |
| |
| // Compress a buffer. |
| std::optional<BlobCompressor> compressor; |
| ASSERT_NO_FAILURES(CompressionHelper(algorithm, input.get(), size, step, &compressor)); |
| ASSERT_TRUE(compressor); |
| |
| // Decompress the buffer. |
| ASSERT_NO_FAILURES(DecompressionHelper(algorithm, compressor->Data(), compressor->Size(), |
| input.get(), size)); |
| } |
| |
| TEST(CompressorTests, CompressDecompressLZ4Random1) { |
| RunCompressDecompressTest(CompressionAlgorithm::LZ4, DataType::Random, 1 << 0, 1 << 0); |
| } |
| |
| TEST(CompressorTests, CompressDecompressLZ4Random2) { |
| RunCompressDecompressTest(CompressionAlgorithm::LZ4, DataType::Random, 1 << 1, 1 << 0); |
| } |
| |
| TEST(CompressorTests, CompressDecompressLZ4Random3) { |
| RunCompressDecompressTest(CompressionAlgorithm::LZ4, DataType::Random, 1 << 10, 1 << 5); |
| } |
| |
| TEST(CompressorTests, CompressDecompressLZ4Random4) { |
| RunCompressDecompressTest(CompressionAlgorithm::LZ4, DataType::Random, 1 << 15, 1 << 10); |
| } |
| |
| TEST(CompressorTests, CompressDecompressLZ4Compressible1) { |
| RunCompressDecompressTest(CompressionAlgorithm::LZ4, DataType::Random, 1 << 0, 1 << 0); |
| } |
| |
| TEST(CompressorTests, CompressDecompressLZ4Compressible2) { |
| RunCompressDecompressTest(CompressionAlgorithm::LZ4, DataType::Random, 1 << 1, 1 << 0); |
| } |
| |
| TEST(CompressorTests, CompressDecompressLZ4Compressible3) { |
| RunCompressDecompressTest(CompressionAlgorithm::LZ4, DataType::Random, 1 << 10, 1 << 5); |
| } |
| |
| TEST(CompressorTests, CompressDecompressLZ4Compressible4) { |
| RunCompressDecompressTest(CompressionAlgorithm::LZ4, DataType::Random, 1 << 15, 1 << 10); |
| } |
| |
| TEST(CompressorTests, CompressDecompressZSTDRandom1) { |
| RunCompressDecompressTest(CompressionAlgorithm::ZSTD, DataType::Random, 1 << 0, 1 << 0); |
| } |
| |
| TEST(CompressorTests, CompressDecompressZSTDRandom2) { |
| RunCompressDecompressTest(CompressionAlgorithm::ZSTD, DataType::Random, 1 << 1, 1 << 0); |
| } |
| |
| TEST(CompressorTests, CompressDecompressZSTDRandom3) { |
| RunCompressDecompressTest(CompressionAlgorithm::ZSTD, DataType::Random, 1 << 10, 1 << 5); |
| } |
| |
| TEST(CompressorTests, CompressDecompressZSTDRandom4) { |
| RunCompressDecompressTest(CompressionAlgorithm::ZSTD, DataType::Random, 1 << 15, 1 << 10); |
| } |
| |
| TEST(CompressorTests, CompressDecompressZSTDCompressible1) { |
| RunCompressDecompressTest(CompressionAlgorithm::ZSTD, DataType::Random, 1 << 0, 1 << 0); |
| } |
| |
| TEST(CompressorTests, CompressDecompressZSTDCompressible2) { |
| RunCompressDecompressTest(CompressionAlgorithm::ZSTD, DataType::Random, 1 << 1, 1 << 0); |
| } |
| |
| TEST(CompressorTests, CompressDecompressZSTDCompressible3) { |
| RunCompressDecompressTest(CompressionAlgorithm::ZSTD, DataType::Random, 1 << 10, 1 << 5); |
| } |
| |
| TEST(CompressorTests, CompressDecompressZSTDCompressible4) { |
| RunCompressDecompressTest(CompressionAlgorithm::ZSTD, DataType::Random, 1 << 15, 1 << 10); |
| } |
| |
| void RunUpdateNoDataTest(CompressionAlgorithm algorithm) { |
| const size_t input_size = 1024; |
| auto compressor = BlobCompressor::Create(algorithm, input_size); |
| ASSERT_TRUE(compressor); |
| |
| std::unique_ptr<char[]> input(new char[input_size]); |
| memset(input.get(), 'a', input_size); |
| |
| // Test that using "Update(data, 0)" acts a no-op, rather than corrupting the buffer. |
| ASSERT_EQ(ZX_OK, compressor->Update(input.get(), 0)); |
| ASSERT_EQ(ZX_OK, compressor->Update(input.get(), input_size)); |
| ASSERT_EQ(ZX_OK, compressor->End()); |
| |
| // Ensure that even with the addition of a zero-length buffer, we still decompress |
| // to the expected output. |
| ASSERT_NO_FAILURES(DecompressionHelper(algorithm, compressor->Data(), compressor->Size(), |
| input.get(), input_size)); |
| } |
| |
| TEST(CompressorTests, UpdateNoDataLZ4) { |
| RunUpdateNoDataTest(CompressionAlgorithm::LZ4); |
| } |
| |
| TEST(CompressorTests, UpdateNoDataZSTD) { |
| RunUpdateNoDataTest(CompressionAlgorithm::ZSTD); |
| } |
| |
| // TODO(smklein): Add a test of: |
| // - Compress |
| // - Round up compressed size to block |
| // - Decompress |
| // (This mimics blobfs' usage, where the exact compressed size is not stored explicitly) |
| |
| } // namespace |
| } // namespace blobfs |