| // Copyright 2017 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/zucchini/patch_utils.h" |
| |
| #include <stdint.h> |
| |
| #include <iterator> |
| #include <vector> |
| |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace zucchini { |
| |
| template <class T> |
| void TestEncodeDecodeVarUInt(const std::vector<T>& data) { |
| std::vector<uint8_t> buffer; |
| |
| std::vector<T> values; |
| for (T basis : data) { |
| // For variety, test the neighborhood values for each case in |data|. Some |
| // test cases may result in overflow when computing |value|, but we don't |
| // care about that. |
| for (int delta = -4; delta <= 4; ++delta) { |
| T value = delta + basis; |
| EncodeVarUInt<T>(value, std::back_inserter(buffer)); |
| values.push_back(value); |
| |
| value = delta - basis; |
| EncodeVarUInt<T>(value, std::back_inserter(buffer)); |
| values.push_back(value); |
| } |
| } |
| |
| auto it = buffer.begin(); |
| for (T expected : values) { |
| T value = T(-1); |
| auto res = DecodeVarUInt(it, buffer.end(), &value); |
| EXPECT_NE(0, res); |
| EXPECT_EQ(expected, value); |
| it += res; |
| } |
| EXPECT_EQ(it, buffer.end()); |
| |
| T value = T(-1); |
| auto res = DecodeVarUInt(it, buffer.end(), &value); |
| EXPECT_EQ(0, res); |
| EXPECT_EQ(T(-1), value); |
| } |
| |
| template <class T> |
| void TestEncodeDecodeVarInt(const std::vector<T>& data) { |
| std::vector<uint8_t> buffer; |
| |
| std::vector<T> values; |
| for (T basis : data) { |
| // For variety, test the neighborhood values for each case in |data|. Some |
| // test cases may result in overflow when computing |value|, but we don't |
| // care about that. |
| for (int delta = -4; delta <= 4; ++delta) { |
| T value = delta + basis; |
| EncodeVarInt(value, std::back_inserter(buffer)); |
| values.push_back(value); |
| |
| value = delta - basis; |
| EncodeVarInt(value, std::back_inserter(buffer)); |
| values.push_back(value); |
| } |
| } |
| |
| auto it = buffer.begin(); |
| for (T expected : values) { |
| T value = T(-1); |
| auto res = DecodeVarInt(it, buffer.end(), &value); |
| EXPECT_NE(0, res); |
| EXPECT_EQ(expected, value); |
| it += res; |
| } |
| EXPECT_EQ(it, buffer.end()); |
| |
| T value = T(-1); |
| auto res = DecodeVarInt(it, buffer.end(), &value); |
| EXPECT_EQ(0, res); |
| EXPECT_EQ(T(-1), value); |
| } |
| |
| TEST(PatchUtilsTest, EncodeDecodeVarUInt32) { |
| TestEncodeDecodeVarUInt<uint32_t>({0, 64, 128, 8192, 16384, 1 << 20, 1 << 21, |
| 1 << 22, 1 << 27, 1 << 28, 0x7FFFFFFFU, |
| UINT32_MAX}); |
| } |
| |
| TEST(PatchUtilsTest, EncodeDecodeVarInt32) { |
| TestEncodeDecodeVarInt<int32_t>({0, 64, 128, 8192, 16384, 1 << 20, 1 << 21, |
| 1 << 22, 1 << 27, 1 << 28, -1, INT32_MIN, |
| INT32_MAX}); |
| } |
| |
| TEST(PatchUtilsTest, EncodeDecodeVarUInt64) { |
| TestEncodeDecodeVarUInt<uint64_t>({0, 64, 128, 8192, 16384, 1 << 20, 1 << 21, |
| 1 << 22, 1ULL << 55, 1ULL << 56, |
| 0x7FFFFFFFFFFFFFFFULL, UINT64_MAX}); |
| } |
| |
| TEST(PatchUtilsTest, EncodeDecodeVarInt64) { |
| TestEncodeDecodeVarInt<int64_t>({0, 64, 128, 8192, 16384, 1 << 20, 1 << 21, |
| 1 << 22, 1LL << 55, 1LL << 56, -1, INT64_MIN, |
| INT64_MAX}); |
| } |
| |
| TEST(PatchUtilsTest, DecodeVarUInt32Malformed) { |
| constexpr uint32_t kUninit = static_cast<uint32_t>(-1LL); |
| |
| // Output variable to ensure that on failure, the output variable is not |
| // written to. |
| uint32_t value = uint32_t(-1); |
| |
| auto TestDecodeVarInt = [&value](const std::vector<uint8_t>& buffer) { |
| value = kUninit; |
| return DecodeVarUInt(buffer.begin(), buffer.end(), &value); |
| }; |
| |
| // Exhausted. |
| EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>{})); |
| EXPECT_EQ(kUninit, value); |
| EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>(4, 128))); |
| EXPECT_EQ(kUninit, value); |
| |
| // Overflow. |
| EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>(6, 128))); |
| EXPECT_EQ(kUninit, value); |
| EXPECT_EQ(0, TestDecodeVarInt({128, 128, 128, 128, 128, 42})); |
| EXPECT_EQ(kUninit, value); |
| |
| // Following are pathological cases that are not handled for simplicity, |
| // hence decoding is expected to be successful. |
| EXPECT_NE(0, TestDecodeVarInt({128, 128, 128, 128, 16})); |
| EXPECT_EQ(uint32_t(0), value); |
| EXPECT_NE(0, TestDecodeVarInt({128, 128, 128, 128, 32})); |
| EXPECT_EQ(uint32_t(0), value); |
| EXPECT_NE(0, TestDecodeVarInt({128, 128, 128, 128, 64})); |
| EXPECT_EQ(uint32_t(0), value); |
| } |
| |
| TEST(PatchUtilsTest, DecodeVarUInt64Malformed) { |
| constexpr uint64_t kUninit = static_cast<uint64_t>(-1); |
| |
| uint64_t value = kUninit; |
| auto TestDecodeVarInt = [&value](const std::vector<uint8_t>& buffer) { |
| value = kUninit; |
| return DecodeVarUInt(buffer.begin(), buffer.end(), &value); |
| }; |
| |
| // Exhausted. |
| EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>{})); |
| EXPECT_EQ(kUninit, value); |
| EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>(9, 128))); |
| EXPECT_EQ(kUninit, value); |
| |
| // Overflow. |
| EXPECT_EQ(0, TestDecodeVarInt(std::vector<uint8_t>(10, 128))); |
| EXPECT_EQ(kUninit, value); |
| EXPECT_EQ(0, TestDecodeVarInt( |
| {128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 42})); |
| EXPECT_EQ(kUninit, value); |
| } |
| |
| } // namespace zucchini |