1// Copyright 2014 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 "components/metrics/compression_utils.h" 6 7#include <string> 8 9#include "base/basictypes.h" 10#include "base/logging.h" 11#include "testing/gtest/include/gtest/gtest.h" 12 13namespace metrics { 14 15namespace { 16 17// The data to be compressed by gzip. This is the hex representation of "hello 18// world". 19const uint8 kData[] = 20 {0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f, 21 0x72, 0x6c, 0x64}; 22 23// This is the string representation of gzip compressed string above. It was 24// obtained by running echo -n "hello world" | gzip -c | hexdump -e '8 1 ", 25// 0x%x"' followed by 0'ing out the OS byte (10th byte) in the header. This is 26// so that the test passes on all platforms (that run various OS'es). 27const uint8 kCompressedData[] = 28 {0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 29 0x00, 0xcb, 0x48, 0xcd, 0xc9, 0xc9, 0x57, 0x28, 0xcf, 30 0x2f, 0xca, 0x49, 0x01, 0x00, 0x85, 0x11, 0x4a, 0x0d, 31 0x0b, 0x00, 0x00, 0x00}; 32 33} // namespace 34 35TEST(CompressionUtilsTest, GzipCompression) { 36 std::string data(reinterpret_cast<const char*>(kData), arraysize(kData)); 37 std::string compressed_data; 38 EXPECT_TRUE(GzipCompress(data, &compressed_data)); 39 std::string golden_compressed_data( 40 reinterpret_cast<const char*>(kCompressedData), 41 arraysize(kCompressedData)); 42 EXPECT_EQ(golden_compressed_data, compressed_data); 43} 44 45TEST(CompressionUtilsTest, GzipUncompression) { 46 std::string compressed_data(reinterpret_cast<const char*>(kCompressedData), 47 arraysize(kCompressedData)); 48 49 std::string uncompressed_data; 50 EXPECT_TRUE(GzipUncompress(compressed_data, &uncompressed_data)); 51 52 std::string golden_data(reinterpret_cast<const char*>(kData), 53 arraysize(kData)); 54 EXPECT_EQ(golden_data, uncompressed_data); 55} 56 57// Checks that compressing/decompressing input > 256 bytes works as expected. 58TEST(CompressionUtilsTest, LargeInput) { 59 const size_t kSize = 32 * 1024; 60 61 // Generate a data string of |kSize| for testing. 62 std::string data; 63 data.resize(kSize); 64 for (size_t i = 0; i < kSize; ++i) 65 data[i] = static_cast<char>(i & 0xFF); 66 67 std::string compressed_data; 68 EXPECT_TRUE(GzipCompress(data, &compressed_data)); 69 70 std::string uncompressed_data; 71 EXPECT_TRUE(GzipUncompress(compressed_data, &uncompressed_data)); 72 73 EXPECT_EQ(data, uncompressed_data); 74} 75 76} // namespace metrics 77