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| 1 // Copyright 2013 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 <gtest/gtest.h> |
| 6 |
| 7 #include <vector> |
| 8 |
| 9 #include "base/safe_numerics.h" |
| 10 |
| 11 namespace base { |
| 12 namespace internal { |
| 13 |
| 14 TEST(SafeNumerics, NumericCast) { |
| 15 int small_positive = 1; |
| 16 int small_negative = -1; |
| 17 int large_positive = INT_MAX; |
| 18 int large_negative = INT_MIN; |
| 19 |
| 20 // Narrow signed destination. |
| 21 EXPECT_TRUE(IsValidNumericCast<signed char>(small_positive)); |
| 22 EXPECT_TRUE(IsValidNumericCast<signed char>(small_negative)); |
| 23 EXPECT_FALSE(IsValidNumericCast<signed char>(large_positive)); |
| 24 EXPECT_FALSE(IsValidNumericCast<signed char>(large_negative)); |
| 25 EXPECT_TRUE(IsValidNumericCast<signed short>(small_positive)); |
| 26 EXPECT_TRUE(IsValidNumericCast<signed short>(small_negative)); |
| 27 |
| 28 // Narrow unsigned destination. |
| 29 EXPECT_TRUE(IsValidNumericCast<unsigned char>(small_positive)); |
| 30 EXPECT_FALSE(IsValidNumericCast<unsigned char>(small_negative)); |
| 31 EXPECT_FALSE(IsValidNumericCast<unsigned char>(large_positive)); |
| 32 EXPECT_FALSE(IsValidNumericCast<unsigned char>(large_negative)); |
| 33 EXPECT_FALSE(IsValidNumericCast<unsigned short>(small_negative)); |
| 34 EXPECT_FALSE(IsValidNumericCast<unsigned short>(large_negative)); |
| 35 |
| 36 // Same width signed destination. |
| 37 EXPECT_TRUE(IsValidNumericCast<signed int>(small_positive)); |
| 38 EXPECT_TRUE(IsValidNumericCast<signed int>(small_negative)); |
| 39 EXPECT_TRUE(IsValidNumericCast<signed int>(large_positive)); |
| 40 EXPECT_TRUE(IsValidNumericCast<signed int>(large_negative)); |
| 41 |
| 42 // Same width unsigned destination. |
| 43 EXPECT_TRUE(IsValidNumericCast<unsigned int>(small_positive)); |
| 44 EXPECT_FALSE(IsValidNumericCast<unsigned int>(small_negative)); |
| 45 EXPECT_TRUE(IsValidNumericCast<unsigned int>(large_positive)); |
| 46 EXPECT_FALSE(IsValidNumericCast<unsigned int>(large_negative)); |
| 47 |
| 48 // Wider signed destination. |
| 49 EXPECT_TRUE(IsValidNumericCast<long long>(small_positive)); |
| 50 EXPECT_TRUE(IsValidNumericCast<long long>(large_negative)); |
| 51 EXPECT_TRUE(IsValidNumericCast<long long>(small_positive)); |
| 52 EXPECT_TRUE(IsValidNumericCast<long long>(large_negative)); |
| 53 |
| 54 // Wider unsigned destination. |
| 55 EXPECT_TRUE(IsValidNumericCast<unsigned long long>(small_positive)); |
| 56 EXPECT_FALSE(IsValidNumericCast<unsigned long long>(small_negative)); |
| 57 EXPECT_TRUE(IsValidNumericCast<unsigned long long>(large_positive)); |
| 58 EXPECT_FALSE(IsValidNumericCast<unsigned long long>(large_negative)); |
| 59 |
| 60 // Negative to size_t. |
| 61 EXPECT_FALSE(IsValidNumericCast<size_t>(small_negative)); |
| 62 EXPECT_FALSE(IsValidNumericCast<size_t>(large_negative)); |
| 63 |
| 64 // Various edge cases. |
| 65 EXPECT_TRUE(IsValidNumericCast<int>(static_cast<short>(SHRT_MIN))); |
| 66 EXPECT_FALSE( |
| 67 IsValidNumericCast<unsigned short>(static_cast<short>(SHRT_MIN))); |
| 68 EXPECT_FALSE(IsValidNumericCast<unsigned short>(SHRT_MIN)); |
| 69 |
| 70 // Confirm that numeric_cast<> actually compiles. |
| 71 std::vector<int> v; |
| 72 unsigned int checked_size = base::numeric_cast<unsigned int>(v.size()); |
| 73 EXPECT_EQ(0, checked_size); |
| 74 } |
| 75 |
| 76 } // namespace internal |
| 77 } // namespace base |
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