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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "ui/gfx/geometry/safe_integer_conversions.h" | 5 #include "ui/gfx/geometry/safe_integer_conversions.h" |
6 | 6 |
7 #include <limits> | 7 #include <limits> |
8 | 8 |
9 #include "testing/gtest/include/gtest/gtest.h" | 9 #include "testing/gtest/include/gtest/gtest.h" |
10 | 10 |
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70 EXPECT_EQ(0, ToRoundedInt(0.f)); | 70 EXPECT_EQ(0, ToRoundedInt(0.f)); |
71 EXPECT_EQ(100, ToRoundedInt(100.1f)); | 71 EXPECT_EQ(100, ToRoundedInt(100.1f)); |
72 EXPECT_EQ(101, ToRoundedInt(100.5f)); | 72 EXPECT_EQ(101, ToRoundedInt(100.5f)); |
73 EXPECT_EQ(101, ToRoundedInt(100.9f)); | 73 EXPECT_EQ(101, ToRoundedInt(100.9f)); |
74 | 74 |
75 EXPECT_EQ(int_min, ToRoundedInt(-infinity)); | 75 EXPECT_EQ(int_min, ToRoundedInt(-infinity)); |
76 EXPECT_EQ(int_min, ToRoundedInt(min)); | 76 EXPECT_EQ(int_min, ToRoundedInt(min)); |
77 EXPECT_EQ(int_min, ToRoundedInt(min - 100)); | 77 EXPECT_EQ(int_min, ToRoundedInt(min - 100)); |
78 } | 78 } |
79 | 79 |
| 80 TEST(SafeIntegerConversions, IntegerOverflow) { |
| 81 int int_max = std::numeric_limits<int>::max(); |
| 82 int int_min = std::numeric_limits<int>::min(); |
| 83 |
| 84 EXPECT_TRUE(AddWouldOverflow(int_max, 1)); |
| 85 EXPECT_TRUE(AddWouldOverflow(int_max, int_max)); |
| 86 EXPECT_TRUE(AddWouldOverflow(int_max - 1000, 1001)); |
| 87 EXPECT_FALSE(AddWouldOverflow(int_max, 0)); |
| 88 EXPECT_FALSE(AddWouldOverflow(1, 2)); |
| 89 EXPECT_FALSE(AddWouldOverflow(1, -1)); |
| 90 EXPECT_FALSE(AddWouldOverflow(int_min, int_max)); |
| 91 EXPECT_FALSE(AddWouldOverflow(int_max - 1000, 1000)); |
| 92 |
| 93 EXPECT_TRUE(AddWouldUnderflow(int_min, -1)); |
| 94 EXPECT_TRUE(AddWouldUnderflow(int_min, int_min)); |
| 95 EXPECT_TRUE(AddWouldUnderflow(int_min + 1000, -1001)); |
| 96 EXPECT_FALSE(AddWouldUnderflow(int_min, 0)); |
| 97 EXPECT_FALSE(AddWouldUnderflow(1, 2)); |
| 98 EXPECT_FALSE(AddWouldUnderflow(1, -1)); |
| 99 EXPECT_FALSE(AddWouldUnderflow(int_min, int_max)); |
| 100 EXPECT_FALSE(AddWouldUnderflow(int_min + 1000, -1000)); |
| 101 |
| 102 EXPECT_TRUE(SubtractWouldOverflow(int_max, -1)); |
| 103 EXPECT_TRUE(SubtractWouldOverflow(int_max, int_min)); |
| 104 EXPECT_TRUE(SubtractWouldOverflow(int_max - 1000, -1001)); |
| 105 EXPECT_TRUE(SubtractWouldOverflow(0, int_min)); |
| 106 EXPECT_FALSE(SubtractWouldOverflow(int_max, 0)); |
| 107 EXPECT_FALSE(SubtractWouldOverflow(1, 2)); |
| 108 EXPECT_FALSE(SubtractWouldOverflow(-1, 1)); |
| 109 EXPECT_FALSE(SubtractWouldOverflow(int_min, int_min)); |
| 110 EXPECT_FALSE(SubtractWouldOverflow(int_max - 1000, -1000)); |
| 111 EXPECT_FALSE(SubtractWouldOverflow(-1, int_min)); |
| 112 |
| 113 EXPECT_TRUE(SubtractWouldUnderflow(int_min, 1)); |
| 114 EXPECT_TRUE(SubtractWouldUnderflow(int_min, int_max)); |
| 115 EXPECT_TRUE(SubtractWouldUnderflow(int_min + 1000, 1001)); |
| 116 EXPECT_FALSE(SubtractWouldUnderflow(int_min, 0)); |
| 117 EXPECT_FALSE(SubtractWouldUnderflow(1, 2)); |
| 118 EXPECT_FALSE(SubtractWouldUnderflow(-1, -1)); |
| 119 EXPECT_FALSE(SubtractWouldUnderflow(int_max, int_max)); |
| 120 EXPECT_FALSE(SubtractWouldUnderflow(int_min + 1000, -1000)); |
| 121 |
| 122 EXPECT_EQ(SafeAdd(0, 0), 0); |
| 123 EXPECT_EQ(SafeAdd(1, 2), 3); |
| 124 EXPECT_EQ(SafeAdd(int_max, 0), int_max); |
| 125 EXPECT_EQ(SafeAdd(int_max, 1), int_max); |
| 126 EXPECT_EQ(SafeAdd(int_max, int_max), int_max); |
| 127 EXPECT_EQ(SafeAdd(int_max, int_min), -1); |
| 128 EXPECT_EQ(SafeAdd(int_min, 1), int_min + 1); |
| 129 EXPECT_EQ(SafeAdd(int_min, -1), int_min); |
| 130 EXPECT_EQ(SafeAdd(int_min, 0), int_min); |
| 131 EXPECT_EQ(SafeAdd(int_min, int_min), int_min); |
| 132 |
| 133 EXPECT_EQ(SafeSubtract(0, 0), 0); |
| 134 EXPECT_EQ(SafeSubtract(3, 2), 1); |
| 135 EXPECT_EQ(SafeSubtract(int_max, 0), int_max); |
| 136 EXPECT_EQ(SafeSubtract(int_max, 1), int_max - 1); |
| 137 EXPECT_EQ(SafeSubtract(int_max, -1), int_max); |
| 138 EXPECT_EQ(SafeSubtract(int_max, int_min), int_max); |
| 139 EXPECT_EQ(SafeSubtract(int_min, 0), int_min); |
| 140 EXPECT_EQ(SafeSubtract(int_min, -1), int_min + 1); |
| 141 EXPECT_EQ(SafeSubtract(int_min, 1), int_min); |
| 142 EXPECT_EQ(SafeSubtract(int_min, int_min), 0); |
| 143 EXPECT_EQ(SafeSubtract(int_max, int_max), 0); |
| 144 EXPECT_EQ(SafeSubtract(0, int_min), int_max); |
| 145 EXPECT_EQ(SafeSubtract(-1, int_min), int_max); |
| 146 } |
| 147 |
80 } // namespace gfx | 148 } // namespace gfx |
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