Samuel Huang | 06f1ae9 | 2018-03-13 18:19:34 +0000 | [diff] [blame] | 1 | // Copyright 2017 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/zucchini/patch_utils.h" |
| 6 | |
| 7 | #include <stdint.h> |
| 8 | |
| 9 | #include <iterator> |
| 10 | #include <vector> |
| 11 | |
| 12 | #include "testing/gtest/include/gtest/gtest.h" |
| 13 | |
| 14 | namespace zucchini { |
| 15 | |
| 16 | template <class T> |
| 17 | void TestEncodeDecodeVarUInt(const std::vector<T>& data) { |
| 18 | std::vector<uint8_t> buffer; |
| 19 | |
| 20 | std::vector<T> values; |
| 21 | for (T basis : data) { |
| 22 | // For variety, test the neighborhood values for each case in |data|. Some |
| 23 | // test cases may result in overflow when computing |value|, but we don't |
| 24 | // care about that. |
| 25 | for (int delta = -4; delta <= 4; ++delta) { |
| 26 | T value = delta + basis; |
| 27 | EncodeVarUInt<T>(value, std::back_inserter(buffer)); |
| 28 | values.push_back(value); |
| 29 | |
| 30 | value = delta - basis; |
| 31 | EncodeVarUInt<T>(value, std::back_inserter(buffer)); |
| 32 | values.push_back(value); |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | auto it = buffer.begin(); |
| 37 | for (T expected : values) { |
| 38 | T value = T(-1); |
| 39 | auto res = DecodeVarUInt(it, buffer.end(), &value); |
| 40 | EXPECT_NE(0, res); |
| 41 | EXPECT_EQ(expected, value); |
| 42 | it += res; |
| 43 | } |
| 44 | EXPECT_EQ(it, buffer.end()); |
| 45 | |
| 46 | T value = T(-1); |
| 47 | auto res = DecodeVarUInt(it, buffer.end(), &value); |
| 48 | EXPECT_EQ(0, res); |
| 49 | EXPECT_EQ(T(-1), value); |
| 50 | } |
| 51 | |
| 52 | template <class T> |
| 53 | void TestEncodeDecodeVarInt(const std::vector<T>& data) { |
| 54 | std::vector<uint8_t> buffer; |
| 55 | |
| 56 | std::vector<T> values; |
| 57 | for (T basis : data) { |
| 58 | // For variety, test the neighborhood values for each case in |data|. Some |
| 59 | // test cases may result in overflow when computing |value|, but we don't |
| 60 | // care about that. |
| 61 | for (int delta = -4; delta <= 4; ++delta) { |
| 62 | T value = delta + basis; |
| 63 | EncodeVarInt(value, std::back_inserter(buffer)); |
| 64 | values.push_back(value); |
| 65 | |
| 66 | value = delta - basis; |
| 67 | EncodeVarInt(value, std::back_inserter(buffer)); |
| 68 | values.push_back(value); |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | auto it = buffer.begin(); |
| 73 | for (T expected : values) { |
| 74 | T value = T(-1); |
| 75 | auto res = DecodeVarInt(it, buffer.end(), &value); |
| 76 | EXPECT_NE(0, res); |
| 77 | EXPECT_EQ(expected, value); |
| 78 | it += res; |
| 79 | } |
| 80 | EXPECT_EQ(it, buffer.end()); |
| 81 | |
| 82 | T value = T(-1); |
| 83 | auto res = DecodeVarInt(it, buffer.end(), &value); |
| 84 | EXPECT_EQ(0, res); |
| 85 | EXPECT_EQ(T(-1), value); |
| 86 | } |
| 87 | |
| 88 | TEST(PatchUtilsTest, EncodeDecodeVarUInt32) { |
| 89 | TestEncodeDecodeVarUInt<uint32_t>({0, 64, 128, 8192, 16384, 1 << 20, 1 << 21, |
| 90 | 1 << 22, 1 << 27, 1 << 28, 0x7FFFFFFFU, |
| 91 | UINT32_MAX}); |
| 92 | } |
| 93 | |
| 94 | TEST(PatchUtilsTest, EncodeDecodeVarInt32) { |
| 95 | TestEncodeDecodeVarInt<int32_t>({0, 64, 128, 8192, 16384, 1 << 20, 1 << 21, |
| 96 | 1 << 22, 1 << 27, 1 << 28, -1, INT32_MIN, |
| 97 | INT32_MAX}); |
| 98 | } |
| 99 | |
| 100 | TEST(PatchUtilsTest, EncodeDecodeVarUInt64) { |
| 101 | TestEncodeDecodeVarUInt<uint64_t>({0, 64, 128, 8192, 16384, 1 << 20, 1 << 21, |
| 102 | 1 << 22, 1ULL << 55, 1ULL << 56, |
| 103 | 0x7FFFFFFFFFFFFFFFULL, UINT64_MAX}); |
| 104 | } |
| 105 | |
| 106 | TEST(PatchUtilsTest, EncodeDecodeVarInt64) { |
| 107 | TestEncodeDecodeVarInt<int64_t>({0, 64, 128, 8192, 16384, 1 << 20, 1 << 21, |
| 108 | 1 << 22, 1LL << 55, 1LL << 56, -1, INT64_MIN, |
| 109 | INT64_MAX}); |
| 110 | } |
| 111 | |
| 112 | TEST(PatchUtilsTest, DecodeVarUInt32Malformed) { |
| 113 | constexpr uint32_t kUninit = static_cast<uint32_t>(-1LL); |
| 114 | |
| 115 | // Output variable to ensure that on failure, the output variable is not |
| 116 | // written to. |
| 117 | uint32_t value = uint32_t(-1); |
| 118 | |
Takuto Ikuta | d60fe38 | 2018-10-18 10:46:07 +0000 | [diff] [blame] | 119 | auto TestDecodeVarInt = [&value](const std::vector<uint8_t>& buffer) { |
Samuel Huang | 06f1ae9 | 2018-03-13 18:19:34 +0000 | [diff] [blame] | 120 | value = kUninit; |
| 121 | return DecodeVarUInt(buffer.begin(), buffer.end(), &value); |
| 122 | }; |
| 123 | |
| 124 | // Exhausted. |
| 125 | EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>{})); |
| 126 | EXPECT_EQ(kUninit, value); |
| 127 | EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>(4, 128))); |
| 128 | EXPECT_EQ(kUninit, value); |
| 129 | |
| 130 | // Overflow. |
| 131 | EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>(6, 128))); |
| 132 | EXPECT_EQ(kUninit, value); |
| 133 | EXPECT_EQ(0, TestDecodeVarInt({128, 128, 128, 128, 128, 42})); |
| 134 | EXPECT_EQ(kUninit, value); |
| 135 | |
| 136 | // Following are pathological cases that are not handled for simplicity, |
| 137 | // hence decoding is expected to be successful. |
| 138 | EXPECT_NE(0, TestDecodeVarInt({128, 128, 128, 128, 16})); |
| 139 | EXPECT_EQ(uint32_t(0), value); |
| 140 | EXPECT_NE(0, TestDecodeVarInt({128, 128, 128, 128, 32})); |
| 141 | EXPECT_EQ(uint32_t(0), value); |
| 142 | EXPECT_NE(0, TestDecodeVarInt({128, 128, 128, 128, 64})); |
| 143 | EXPECT_EQ(uint32_t(0), value); |
| 144 | } |
| 145 | |
| 146 | TEST(PatchUtilsTest, DecodeVarUInt64Malformed) { |
| 147 | constexpr uint64_t kUninit = static_cast<uint64_t>(-1); |
| 148 | |
| 149 | uint64_t value = kUninit; |
Takuto Ikuta | d60fe38 | 2018-10-18 10:46:07 +0000 | [diff] [blame] | 150 | auto TestDecodeVarInt = [&value](const std::vector<uint8_t>& buffer) { |
Samuel Huang | 06f1ae9 | 2018-03-13 18:19:34 +0000 | [diff] [blame] | 151 | value = kUninit; |
| 152 | return DecodeVarUInt(buffer.begin(), buffer.end(), &value); |
| 153 | }; |
| 154 | |
| 155 | // Exhausted. |
| 156 | EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>{})); |
| 157 | EXPECT_EQ(kUninit, value); |
| 158 | EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>(9, 128))); |
| 159 | EXPECT_EQ(kUninit, value); |
| 160 | |
| 161 | // Overflow. |
| 162 | EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>(10, 128))); |
| 163 | EXPECT_EQ(kUninit, value); |
| 164 | EXPECT_EQ(0, TestDecodeVarInt( |
| 165 | {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 42})); |
| 166 | EXPECT_EQ(kUninit, value); |
| 167 | } |
| 168 | |
| 169 | } // namespace zucchini |