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// Copyright 2014 The Chromium 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 "components/metrics/compression_utils.h"
#include <string>
#include "base/basictypes.h"
#include "base/logging.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace metrics {
namespace {
// The data to be compressed by gzip. This is the hex representation of "hello
// world".
const uint8 kData[] =
{0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20, 0x77, 0x6f,
0x72, 0x6c, 0x64};
// This is the string representation of gzip compressed string above. It was
// obtained by running echo -n "hello world" | gzip -c | hexdump -e '8 1 ",
// 0x%x"' followed by 0'ing out the OS byte (10th byte) in the header. This is
// so that the test passes on all platforms (that run various OS'es).
const uint8 kCompressedData[] =
{0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xcb, 0x48, 0xcd, 0xc9, 0xc9, 0x57, 0x28, 0xcf,
0x2f, 0xca, 0x49, 0x01, 0x00, 0x85, 0x11, 0x4a, 0x0d,
0x0b, 0x00, 0x00, 0x00};
} // namespace
TEST(CompressionUtilsTest, GzipCompression) {
std::string data(reinterpret_cast<const char*>(kData), arraysize(kData));
std::string compressed_data;
EXPECT_TRUE(GzipCompress(data, &compressed_data));
std::string golden_compressed_data(
reinterpret_cast<const char*>(kCompressedData),
arraysize(kCompressedData));
EXPECT_EQ(golden_compressed_data, compressed_data);
}
TEST(CompressionUtilsTest, GzipUncompression) {
std::string compressed_data(reinterpret_cast<const char*>(kCompressedData),
arraysize(kCompressedData));
std::string uncompressed_data;
EXPECT_TRUE(GzipUncompress(compressed_data, &uncompressed_data));
std::string golden_data(reinterpret_cast<const char*>(kData),
arraysize(kData));
EXPECT_EQ(golden_data, uncompressed_data);
}
// Checks that compressing/decompressing input > 256 bytes works as expected.
TEST(CompressionUtilsTest, LargeInput) {
const size_t kSize = 32 * 1024;
// Generate a data string of |kSize| for testing.
std::string data;
data.resize(kSize);
for (size_t i = 0; i < kSize; ++i)
data[i] = static_cast<char>(i & 0xFF);
std::string compressed_data;
EXPECT_TRUE(GzipCompress(data, &compressed_data));
std::string uncompressed_data;
EXPECT_TRUE(GzipUncompress(compressed_data, &uncompressed_data));
EXPECT_EQ(data, uncompressed_data);
}
TEST(CompressionUtilsTest, InPlace) {
const std::string original_data(reinterpret_cast<const char*>(kData),
arraysize(kData));
const std::string golden_compressed_data(
reinterpret_cast<const char*>(kCompressedData),
arraysize(kCompressedData));
std::string data(original_data);
EXPECT_TRUE(GzipCompress(data, &data));
EXPECT_EQ(golden_compressed_data, data);
EXPECT_TRUE(GzipUncompress(data, &data));
EXPECT_EQ(original_data, data);
}
} // namespace metrics
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