1 //===-- sanitizer_lzw_test.cpp ----------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 #include "sanitizer_common/sanitizer_lzw.h"
9
10 #include <algorithm>
11 #include <iterator>
12
13 #include "gtest/gtest.h"
14 #include "sanitizer_hash.h"
15
16 namespace __sanitizer {
17
18 template <typename T>
19 struct LzwTest : public ::testing::Test {
20 template <typename Generator>
Run__sanitizer::LzwTest21 void Run(size_t n, Generator gen) {
22 std::vector<T> data(n);
23 std::generate(data.begin(), data.end(), gen);
24
25 std::vector<u64> lzw;
26 LzwEncode<T>(data.begin(), data.end(), std::back_inserter(lzw));
27
28 std::vector<T> unlzw(data.size() * 2);
29 auto unlzw_end = LzwDecode<T>(lzw.begin(), lzw.end(), unlzw.data());
30 unlzw.resize(unlzw_end - unlzw.data());
31
32 EXPECT_EQ(data, unlzw);
33 }
34 };
35
36 static constexpr size_t kSizes[] = {0, 1, 2, 7, 13, 32, 129, 10000};
37
38 using LzwTestTypes = ::testing::Types<u8, u16, u32, u64>;
39 TYPED_TEST_SUITE(LzwTest, LzwTestTypes, );
40
TYPED_TEST(LzwTest,Same)41 TYPED_TEST(LzwTest, Same) {
42 MurMur2Hash64Builder h(0);
43 for (size_t sz : kSizes) {
44 u64 v = 0;
45 for (size_t i = 0; i < 100 && !this->HasFailure(); ++i) {
46 this->Run(sz, [&] { return v; });
47 h.add(i);
48 v = h.get();
49 }
50 }
51 }
52
TYPED_TEST(LzwTest,Increment)53 TYPED_TEST(LzwTest, Increment) {
54 MurMur2Hash64Builder h(0);
55 for (size_t sz : kSizes) {
56 u64 v = 0;
57 for (size_t i = 0; i < 100 && !this->HasFailure(); ++i) {
58 this->Run(sz, [&v] { return v++; });
59 h.add(i);
60 v = h.get();
61 }
62 }
63 }
64
TYPED_TEST(LzwTest,IncrementMod)65 TYPED_TEST(LzwTest, IncrementMod) {
66 MurMur2Hash64Builder h(0);
67 for (size_t sz : kSizes) {
68 u64 v = 0;
69 for (size_t i = 1; i < 16 && !this->HasFailure(); ++i) {
70 this->Run(sz, [&] { return v++ % i; });
71 h.add(i);
72 v = h.get();
73 }
74 }
75 }
76
TYPED_TEST(LzwTest,RandomLimited)77 TYPED_TEST(LzwTest, RandomLimited) {
78 for (size_t sz : kSizes) {
79 for (size_t i = 1; i < 1000 && !this->HasFailure(); i *= 2) {
80 u64 v = 0;
81 this->Run(sz, [&] {
82 MurMur2Hash64Builder h(v % i /* Keep unique set limited */);
83 v = h.get();
84 return v;
85 });
86 }
87 }
88 }
89
90 } // namespace __sanitizer
91