1 // Copyright 2016 PDFium 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 "core/fxcrt/cfx_string_pool_template.h"
6 #include "core/fxcrt/fx_string.h"
7 #include "testing/fx_string_testhelpers.h"
8 #include "testing/gtest/include/gtest/gtest.h"
9
TEST(fxcrt,ByteStringPool)10 TEST(fxcrt, ByteStringPool) {
11 CFX_ByteStringPool pool;
12
13 CFX_ByteString null1;
14 CFX_ByteString null2;
15 CFX_ByteString goats1("goats");
16 CFX_ByteString goats2("goats");
17
18 // Underlying storage, if non-null, is not shared.
19 EXPECT_EQ(nullptr, null1.m_pData.Get());
20 EXPECT_EQ(nullptr, null2.m_pData.Get());
21 EXPECT_NE(goats1.m_pData, goats2.m_pData);
22
23 CFX_ByteString interned_null1 = pool.Intern(null1);
24 CFX_ByteString interned_null2 = pool.Intern(null2);
25 CFX_ByteString interned_goats1 = pool.Intern(goats1);
26 CFX_ByteString interned_goats2 = pool.Intern(goats2);
27
28 // Strings are logically equal after being interned.
29 EXPECT_EQ(null1, interned_null1);
30 EXPECT_EQ(null2, interned_null2);
31 EXPECT_EQ(goats1, interned_goats1);
32 EXPECT_EQ(goats2, interned_goats2);
33
34 // Interned underlying storage, if non-null, belongs to first seen.
35 EXPECT_EQ(nullptr, interned_null1.m_pData.Get());
36 EXPECT_EQ(nullptr, interned_null2.m_pData.Get());
37 EXPECT_EQ(goats1.m_pData, interned_goats1.m_pData);
38 EXPECT_EQ(goats1.m_pData, interned_goats2.m_pData);
39
40 pool.Clear();
41 CFX_ByteString reinterned_null2 = pool.Intern(null2);
42 CFX_ByteString reinterned_null1 = pool.Intern(null2);
43 CFX_ByteString reinterned_goats2 = pool.Intern(goats2);
44 CFX_ByteString reinterned_goats1 = pool.Intern(goats2);
45
46 // After clearing pool, storage was re-interned using second strings.
47 EXPECT_EQ(nullptr, interned_null1.m_pData.Get());
48 EXPECT_EQ(nullptr, interned_null2.m_pData.Get());
49 EXPECT_EQ(goats2.m_pData, reinterned_goats1.m_pData);
50 EXPECT_EQ(goats2.m_pData, reinterned_goats2.m_pData);
51 }
52
TEST(fxcrt,WideStringPool)53 TEST(fxcrt, WideStringPool) {
54 CFX_WideStringPool pool;
55
56 CFX_WideString null1;
57 CFX_WideString null2;
58 CFX_WideString goats1(L"goats");
59 CFX_WideString goats2(L"goats");
60
61 // Underlying storage, if non-null, is not shared.
62 EXPECT_EQ(nullptr, null1.m_pData.Get());
63 EXPECT_EQ(nullptr, null2.m_pData.Get());
64 EXPECT_NE(goats1.m_pData, goats2.m_pData);
65
66 CFX_WideString interned_null1 = pool.Intern(null1);
67 CFX_WideString interned_null2 = pool.Intern(null2);
68 CFX_WideString interned_goats1 = pool.Intern(goats1);
69 CFX_WideString interned_goats2 = pool.Intern(goats2);
70
71 // Strings are logically equal after being interned.
72 EXPECT_EQ(null1, interned_null1);
73 EXPECT_EQ(null2, interned_null2);
74 EXPECT_EQ(goats1, interned_goats1);
75 EXPECT_EQ(goats2, interned_goats2);
76
77 // Interned underlying storage, if non-null, belongs to first seen.
78 EXPECT_EQ(nullptr, interned_null1.m_pData.Get());
79 EXPECT_EQ(nullptr, interned_null2.m_pData.Get());
80 EXPECT_EQ(goats1.m_pData, interned_goats1.m_pData);
81 EXPECT_EQ(goats1.m_pData, interned_goats2.m_pData);
82
83 pool.Clear();
84 CFX_WideString reinterned_null2 = pool.Intern(null2);
85 CFX_WideString reinterned_null1 = pool.Intern(null2);
86 CFX_WideString reinterned_goats2 = pool.Intern(goats2);
87 CFX_WideString reinterned_goats1 = pool.Intern(goats2);
88
89 // After clearing pool, storage was re-interned using second strings.
90 EXPECT_EQ(nullptr, interned_null1.m_pData.Get());
91 EXPECT_EQ(nullptr, interned_null2.m_pData.Get());
92 EXPECT_EQ(goats2.m_pData, reinterned_goats1.m_pData);
93 EXPECT_EQ(goats2.m_pData, reinterned_goats2.m_pData);
94 }
95