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 "third_party/zlib/google/compression_utils.h"
6
7 #include <stddef.h>
8 #include <stdint.h>
9
10 #include <string>
11
12 #include "base/stl_util.h"
13 #include "testing/gtest/include/gtest/gtest.h"
14
15 namespace compression {
16
17 namespace {
18
19 // The data to be compressed by gzip. This is the hex representation of "hello
20 // world".
21 const uint8_t kData[] = {0x68, 0x65, 0x6c, 0x6c, 0x6f, 0x20,
22 0x77, 0x6f, 0x72, 0x6c, 0x64};
23
24 // This is the string representation of gzip compressed string above. It was
25 // obtained by running echo -n "hello world" | gzip -c | hexdump -e '8 1 ",
26 // 0x%x"' followed by 0'ing out the OS byte (10th byte) in the header. This is
27 // so that the test passes on all platforms (that run various OS'es).
28 const uint8_t kCompressedData[] = {
29 0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xcb,
30 0x48, 0xcd, 0xc9, 0xc9, 0x57, 0x28, 0xcf, 0x2f, 0xca, 0x49, 0x01,
31 0x00, 0x85, 0x11, 0x4a, 0x0d, 0x0b, 0x00, 0x00, 0x00};
32
33 } // namespace
34
TEST(CompressionUtilsTest,GzipCompression)35 TEST(CompressionUtilsTest, GzipCompression) {
36 std::string data(reinterpret_cast<const char*>(kData), base::size(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 base::size(kCompressedData));
42 EXPECT_EQ(golden_compressed_data, compressed_data);
43 }
44
TEST(CompressionUtilsTest,GzipUncompression)45 TEST(CompressionUtilsTest, GzipUncompression) {
46 std::string compressed_data(reinterpret_cast<const char*>(kCompressedData),
47 base::size(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 base::size(kData));
54 EXPECT_EQ(golden_data, uncompressed_data);
55 }
56
TEST(CompressionUtilsTest,GzipUncompressionFromSpanToString)57 TEST(CompressionUtilsTest, GzipUncompressionFromSpanToString) {
58 std::string uncompressed_data;
59 EXPECT_TRUE(GzipUncompress(kCompressedData, &uncompressed_data));
60
61 std::string golden_data(reinterpret_cast<const char*>(kData),
62 base::size(kData));
63 EXPECT_EQ(golden_data, uncompressed_data);
64 }
65
66 // Checks that compressing/decompressing input > 256 bytes works as expected.
TEST(CompressionUtilsTest,LargeInput)67 TEST(CompressionUtilsTest, LargeInput) {
68 const size_t kSize = 32 * 1024;
69
70 // Generate a data string of |kSize| for testing.
71 std::string data;
72 data.resize(kSize);
73 for (size_t i = 0; i < kSize; ++i)
74 data[i] = static_cast<char>(i & 0xFF);
75
76 std::string compressed_data;
77 EXPECT_TRUE(GzipCompress(data, &compressed_data));
78
79 std::string uncompressed_data;
80 EXPECT_TRUE(GzipUncompress(compressed_data, &uncompressed_data));
81
82 EXPECT_EQ(data, uncompressed_data);
83 }
84
TEST(CompressionUtilsTest,InPlace)85 TEST(CompressionUtilsTest, InPlace) {
86 const std::string original_data(reinterpret_cast<const char*>(kData),
87 base::size(kData));
88 const std::string golden_compressed_data(
89 reinterpret_cast<const char*>(kCompressedData),
90 base::size(kCompressedData));
91
92 std::string data(original_data);
93 EXPECT_TRUE(GzipCompress(data, &data));
94 EXPECT_EQ(golden_compressed_data, data);
95 EXPECT_TRUE(GzipUncompress(data, &data));
96 EXPECT_EQ(original_data, data);
97 }
98
99 } // namespace compression
100