1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159
|
/*
* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/numerics/mod_ops.h"
#include <stdint.h>
#include "test/gtest.h"
namespace webrtc {
class TestModOps : public ::testing::Test {
protected:
// Can't use std::numeric_limits<unsigned long>::max() since
// MSVC doesn't support constexpr.
static const unsigned long ulmax = ~0ul; // NOLINT
};
TEST_F(TestModOps, Add) {
const int D = 100;
ASSERT_EQ(1u, Add<D>(0, 1));
ASSERT_EQ(0u, Add<D>(0, D));
for (int i = 0; i < D; ++i)
ASSERT_EQ(0u, Add<D>(i, D - i));
int t = 37;
uint8_t a = t;
for (int i = 0; i < 256; ++i) {
ASSERT_EQ(a, static_cast<uint8_t>(t));
t = Add<256>(t, 1);
++a;
}
}
TEST_F(TestModOps, AddLarge) {
const unsigned long D = ulmax - 10ul; // NOLINT
unsigned long l = D - 1ul; // NOLINT
ASSERT_EQ(D - 2ul, Add<D>(l, l));
ASSERT_EQ(9ul, Add<D>(l, ulmax));
ASSERT_EQ(10ul, Add<D>(0ul, ulmax));
}
TEST_F(TestModOps, Subtract) {
const int D = 100;
ASSERT_EQ(99u, Subtract<D>(0, 1));
ASSERT_EQ(0u, Subtract<D>(0, D));
for (int i = 0; i < D; ++i)
ASSERT_EQ(0u, Subtract<D>(i, D + i));
int t = 37;
uint8_t a = t;
for (int i = 0; i < 256; ++i) {
ASSERT_EQ(a, static_cast<uint8_t>(t));
t = Subtract<256>(t, 1);
--a;
}
}
TEST_F(TestModOps, SubtractLarge) {
// NOLINTNEXTLINE
const unsigned long D = ulmax - 10ul; // NOLINT
unsigned long l = D - 1ul; // NOLINT
ASSERT_EQ(0ul, Subtract<D>(l, l));
ASSERT_EQ(D - 11ul, Subtract<D>(l, ulmax));
ASSERT_EQ(D - 10ul, Subtract<D>(0ul, ulmax));
}
TEST_F(TestModOps, ForwardDiff) {
ASSERT_EQ(0u, ForwardDiff(4711u, 4711u));
uint8_t x = 0;
uint8_t y = 255;
for (int i = 0; i < 256; ++i) {
ASSERT_EQ(255u, ForwardDiff(x, y));
++x;
++y;
}
int yi = 255;
for (int i = 0; i < 256; ++i) {
ASSERT_EQ(255u, ForwardDiff<uint8_t>(x, yi));
++x;
++yi;
}
}
TEST_F(TestModOps, ForwardDiffWithDivisor) {
ASSERT_EQ(122, (ForwardDiff<uint8_t, 123>(0, 122)));
ASSERT_EQ(0, (ForwardDiff<uint8_t, 123>(122, 122)));
ASSERT_EQ(122, (ForwardDiff<uint8_t, 123>(1, 0)));
ASSERT_EQ(0, (ForwardDiff<uint8_t, 123>(0, 0)));
ASSERT_EQ(1, (ForwardDiff<uint8_t, 123>(122, 0)));
}
TEST_F(TestModOps, ReverseDiff) {
ASSERT_EQ(0u, ReverseDiff(4711u, 4711u));
uint8_t x = 0;
uint8_t y = 255;
for (int i = 0; i < 256; ++i) {
ASSERT_EQ(1u, ReverseDiff(x, y));
++x;
++y;
}
int yi = 255;
for (int i = 0; i < 256; ++i) {
ASSERT_EQ(1u, ReverseDiff<uint8_t>(x, yi));
++x;
++yi;
}
}
TEST_F(TestModOps, ReverseDiffWithDivisor) {
ASSERT_EQ(1, (ReverseDiff<uint8_t, 123>(0, 122)));
ASSERT_EQ(0, (ReverseDiff<uint8_t, 123>(122, 122)));
ASSERT_EQ(1, (ReverseDiff<uint8_t, 123>(1, 0)));
ASSERT_EQ(0, (ReverseDiff<uint8_t, 123>(0, 0)));
ASSERT_EQ(122, (ReverseDiff<uint8_t, 123>(122, 0)));
}
TEST_F(TestModOps, MinDiff) {
for (uint16_t i = 0; i < 256; ++i) {
ASSERT_EQ(0, MinDiff<uint8_t>(i, i));
ASSERT_EQ(1, MinDiff<uint8_t>(i - 1, i));
ASSERT_EQ(1, MinDiff<uint8_t>(i + 1, i));
}
for (uint8_t i = 0; i < 128; ++i)
ASSERT_EQ(i, MinDiff<uint8_t>(0, i));
for (uint8_t i = 0; i < 128; ++i)
ASSERT_EQ(128 - i, MinDiff<uint8_t>(0, 128 + i));
}
TEST_F(TestModOps, MinDiffWitDivisor) {
ASSERT_EQ(5u, (MinDiff<uint8_t, 11>(0, 5)));
ASSERT_EQ(5u, (MinDiff<uint8_t, 11>(0, 6)));
ASSERT_EQ(5u, (MinDiff<uint8_t, 11>(5, 0)));
ASSERT_EQ(5u, (MinDiff<uint8_t, 11>(6, 0)));
const uint16_t D = 4711;
for (uint16_t i = 0; i < D / 2; ++i)
ASSERT_EQ(i, (MinDiff<uint16_t, D>(0, i)));
ASSERT_EQ(D / 2, (MinDiff<uint16_t, D>(0, D / 2)));
for (uint16_t i = 0; i < D / 2; ++i)
ASSERT_EQ(D / 2 - i, (MinDiff<uint16_t, D>(0, D / 2 - i)));
}
} // namespace webrtc
|